diff options
Diffstat (limited to 'gdb/dwarf2read.c')
| -rw-r--r-- | gdb/dwarf2read.c | 5865 |
1 files changed, 5865 insertions, 0 deletions
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c new file mode 100644 index 00000000000..cf5206631ec --- /dev/null +++ b/gdb/dwarf2read.c @@ -0,0 +1,5865 @@ +/* DWARF 2 debugging format support for GDB. + Copyright 1994, 1995, 1996, 1997, 1998 Free Software Foundation, Inc. + + Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology, + Inc. with support from Florida State University (under contract + with the Ada Joint Program Office), and Silicon Graphics, Inc. + Initial contribution by Brent Benson, Harris Computer Systems, Inc., + based on Fred Fish's (Cygnus Support) implementation of DWARF 1 + support in dwarfread.c + +This file is part of GDB. + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or (at +your option) any later version. + +This program is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#include "defs.h" +#include "bfd.h" +#include "elf-bfd.h" +#include "symtab.h" +#include "gdbtypes.h" +#include "symfile.h" +#include "objfiles.h" +#include "elf/dwarf2.h" +#include "buildsym.h" +#include "demangle.h" +#include "expression.h" +#include "language.h" +#include "complaints.h" + +#include <fcntl.h> +#include "gdb_string.h" +#include <sys/types.h> + +/* .debug_info header for a compilation unit + Because of alignment constraints, this structure has padding and cannot + be mapped directly onto the beginning of the .debug_info section. */ +typedef struct comp_unit_header + { + unsigned int length; /* length of the .debug_info + contribution */ + unsigned short version; /* version number -- 2 for DWARF + version 2 */ + unsigned int abbrev_offset; /* offset into .debug_abbrev section */ + unsigned char addr_size; /* byte size of an address -- 4 */ + } +_COMP_UNIT_HEADER; +#define _ACTUAL_COMP_UNIT_HEADER_SIZE 11 + +/* .debug_pubnames header + Because of alignment constraints, this structure has padding and cannot + be mapped directly onto the beginning of the .debug_info section. */ +typedef struct pubnames_header + { + unsigned int length; /* length of the .debug_pubnames + contribution */ + unsigned char version; /* version number -- 2 for DWARF + version 2 */ + unsigned int info_offset; /* offset into .debug_info section */ + unsigned int info_size; /* byte size of .debug_info section + portion */ + } +_PUBNAMES_HEADER; +#define _ACTUAL_PUBNAMES_HEADER_SIZE 13 + +/* .debug_pubnames header + Because of alignment constraints, this structure has padding and cannot + be mapped directly onto the beginning of the .debug_info section. */ +typedef struct aranges_header + { + unsigned int length; /* byte len of the .debug_aranges + contribution */ + unsigned short version; /* version number -- 2 for DWARF + version 2 */ + unsigned int info_offset; /* offset into .debug_info section */ + unsigned char addr_size; /* byte size of an address */ + unsigned char seg_size; /* byte size of segment descriptor */ + } +_ARANGES_HEADER; +#define _ACTUAL_ARANGES_HEADER_SIZE 12 + +/* .debug_line statement program prologue + Because of alignment constraints, this structure has padding and cannot + be mapped directly onto the beginning of the .debug_info section. */ +typedef struct statement_prologue + { + unsigned int total_length; /* byte length of the statement + information */ + unsigned short version; /* version number -- 2 for DWARF + version 2 */ + unsigned int prologue_length; /* # bytes between prologue & + stmt program */ + unsigned char minimum_instruction_length; /* byte size of + smallest instr */ + unsigned char default_is_stmt; /* initial value of is_stmt + register */ + char line_base; + unsigned char line_range; + unsigned char opcode_base; /* number assigned to first special + opcode */ + unsigned char *standard_opcode_lengths; + } +_STATEMENT_PROLOGUE; + +/* offsets and sizes of debugging sections */ + +static file_ptr dwarf_info_offset; +static file_ptr dwarf_abbrev_offset; +static file_ptr dwarf_line_offset; +static file_ptr dwarf_pubnames_offset; +static file_ptr dwarf_aranges_offset; +static file_ptr dwarf_loc_offset; +static file_ptr dwarf_macinfo_offset; +static file_ptr dwarf_str_offset; + +static unsigned int dwarf_info_size; +static unsigned int dwarf_abbrev_size; +static unsigned int dwarf_line_size; +static unsigned int dwarf_pubnames_size; +static unsigned int dwarf_aranges_size; +static unsigned int dwarf_loc_size; +static unsigned int dwarf_macinfo_size; +static unsigned int dwarf_str_size; + +/* names of the debugging sections */ + +#define INFO_SECTION ".debug_info" +#define ABBREV_SECTION ".debug_abbrev" +#define LINE_SECTION ".debug_line" +#define PUBNAMES_SECTION ".debug_pubnames" +#define ARANGES_SECTION ".debug_aranges" +#define LOC_SECTION ".debug_loc" +#define MACINFO_SECTION ".debug_macinfo" +#define STR_SECTION ".debug_str" + +/* local data types */ + +/* The data in a compilation unit header looks like this. */ +struct comp_unit_head + { + unsigned int length; + short version; + unsigned int abbrev_offset; + unsigned char addr_size; + }; + +/* The data in the .debug_line statement prologue looks like this. */ +struct line_head + { + unsigned int total_length; + unsigned short version; + unsigned int prologue_length; + unsigned char minimum_instruction_length; + unsigned char default_is_stmt; + int line_base; + unsigned char line_range; + unsigned char opcode_base; + unsigned char *standard_opcode_lengths; + }; + +/* When we construct a partial symbol table entry we only + need this much information. */ +struct partial_die_info + { + enum dwarf_tag tag; + unsigned char has_children; + unsigned char is_external; + unsigned char is_declaration; + unsigned char has_type; + unsigned int offset; + unsigned int abbrev; + char *name; + CORE_ADDR lowpc; + CORE_ADDR highpc; + struct dwarf_block *locdesc; + unsigned int language; + char *sibling; + }; + +/* This data structure holds the information of an abbrev. */ +struct abbrev_info + { + unsigned int number; /* number identifying abbrev */ + enum dwarf_tag tag; /* dwarf tag */ + int has_children; /* boolean */ + unsigned int num_attrs; /* number of attributes */ + struct attr_abbrev *attrs; /* an array of attribute descriptions */ + struct abbrev_info *next; /* next in chain */ + }; + +struct attr_abbrev + { + enum dwarf_attribute name; + enum dwarf_form form; + }; + +/* This data structure holds a complete die structure. */ +struct die_info + { + enum dwarf_tag tag; /* Tag indicating type of die */ + unsigned short has_children; /* Does the die have children */ + unsigned int abbrev; /* Abbrev number */ + unsigned int offset; /* Offset in .debug_info section */ + unsigned int num_attrs; /* Number of attributes */ + struct attribute *attrs; /* An array of attributes */ + struct die_info *next_ref; /* Next die in ref hash table */ + struct die_info *next; /* Next die in linked list */ + struct type *type; /* Cached type information */ + }; + +/* Attributes have a name and a value */ +struct attribute + { + enum dwarf_attribute name; + enum dwarf_form form; + union + { + char *str; + struct dwarf_block *blk; + unsigned int unsnd; + int snd; + CORE_ADDR addr; + } + u; + }; + +/* Get at parts of an attribute structure */ + +#define DW_STRING(attr) ((attr)->u.str) +#define DW_UNSND(attr) ((attr)->u.unsnd) +#define DW_BLOCK(attr) ((attr)->u.blk) +#define DW_SND(attr) ((attr)->u.snd) +#define DW_ADDR(attr) ((attr)->u.addr) + +/* Blocks are a bunch of untyped bytes. */ +struct dwarf_block + { + unsigned int size; + char *data; + }; + +/* We only hold one compilation unit's abbrevs in + memory at any one time. */ +#ifndef ABBREV_HASH_SIZE +#define ABBREV_HASH_SIZE 121 +#endif +#ifndef ATTR_ALLOC_CHUNK +#define ATTR_ALLOC_CHUNK 4 +#endif + +static struct abbrev_info *dwarf2_abbrevs[ABBREV_HASH_SIZE]; + +/* A hash table of die offsets for following references. */ +#ifndef REF_HASH_SIZE +#define REF_HASH_SIZE 1021 +#endif + +static struct die_info *die_ref_table[REF_HASH_SIZE]; + +/* Obstack for allocating temporary storage used during symbol reading. */ +static struct obstack dwarf2_tmp_obstack; + +/* Offset to the first byte of the current compilation unit header, + for resolving relative reference dies. */ +static unsigned int cu_header_offset; + +/* Allocate fields for structs, unions and enums in this size. */ +#ifndef DW_FIELD_ALLOC_CHUNK +#define DW_FIELD_ALLOC_CHUNK 4 +#endif + +/* The language we are debugging. */ +static enum language cu_language; +static const struct language_defn *cu_language_defn; + +/* Actually data from the sections. */ +static char *dwarf_info_buffer; +static char *dwarf_abbrev_buffer; +static char *dwarf_line_buffer; + +/* A zeroed version of a partial die for initialization purposes. */ +static struct partial_die_info zeroed_partial_die; + +/* The generic symbol table building routines have separate lists for + file scope symbols and all all other scopes (local scopes). So + we need to select the right one to pass to add_symbol_to_list(). + We do it by keeping a pointer to the correct list in list_in_scope. + + FIXME: The original dwarf code just treated the file scope as the first + local scope, and all other local scopes as nested local scopes, and worked + fine. Check to see if we really need to distinguish these + in buildsym.c. */ +static struct pending **list_in_scope = &file_symbols; + +/* FIXME: The following variables pass additional information from + decode_locdesc to the caller. */ +static int optimized_out; /* Kludge to identify optimized out variables */ +static int isreg; /* Kludge to identify register variables */ +static int offreg; /* Kludge to identify basereg references */ +static int basereg; /* Which base register is it relative to? */ +static int islocal; /* Kludge to identify local variables */ + +/* DW_AT_frame_base values for the current function. + frame_base_reg is -1 if DW_AT_frame_base is missing, otherwise it + contains the register number for the frame register. + frame_base_offset is the offset from the frame register to the + virtual stack frame. */ +static int frame_base_reg; +static CORE_ADDR frame_base_offset; + +/* This value is added to each symbol value. FIXME: Generalize to + the section_offsets structure used by dbxread (once this is done, + pass the appropriate section number to end_symtab). */ +static CORE_ADDR baseaddr; /* Add to each symbol value */ + +/* We put a pointer to this structure in the read_symtab_private field + of the psymtab. + The complete dwarf information for an objfile is kept in the + psymbol_obstack, so that absolute die references can be handled. + Most of the information in this structure is related to an entire + object file and could be passed via the sym_private field of the objfile. + It is however conceivable that dwarf2 might not be the only type + of symbols read from an object file. */ + +struct dwarf2_pinfo +{ + /* Pointer to start of dwarf info buffer for the objfile. */ + + char *dwarf_info_buffer; + + /* Offset in dwarf_info_buffer for this compilation unit. */ + + unsigned long dwarf_info_offset; + + /* Pointer to start of dwarf abbreviation buffer for the objfile. */ + + char *dwarf_abbrev_buffer; + + /* Size of dwarf abbreviation section for the objfile. */ + + unsigned int dwarf_abbrev_size; + + /* Pointer to start of dwarf line buffer for the objfile. */ + + char *dwarf_line_buffer; +}; + +#define PST_PRIVATE(p) ((struct dwarf2_pinfo *)(p)->read_symtab_private) +#define DWARF_INFO_BUFFER(p) (PST_PRIVATE(p)->dwarf_info_buffer) +#define DWARF_INFO_OFFSET(p) (PST_PRIVATE(p)->dwarf_info_offset) +#define DWARF_ABBREV_BUFFER(p) (PST_PRIVATE(p)->dwarf_abbrev_buffer) +#define DWARF_ABBREV_SIZE(p) (PST_PRIVATE(p)->dwarf_abbrev_size) +#define DWARF_LINE_BUFFER(p) (PST_PRIVATE(p)->dwarf_line_buffer) + +/* Maintain an array of referenced fundamental types for the current + compilation unit being read. For DWARF version 1, we have to construct + the fundamental types on the fly, since no information about the + fundamental types is supplied. Each such fundamental type is created by + calling a language dependent routine to create the type, and then a + pointer to that type is then placed in the array at the index specified + by it's FT_<TYPENAME> value. The array has a fixed size set by the + FT_NUM_MEMBERS compile time constant, which is the number of predefined + fundamental types gdb knows how to construct. */ +static struct type *ftypes[FT_NUM_MEMBERS]; /* Fundamental types */ + +/* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte, + but this would require a corresponding change in unpack_field_as_long + and friends. */ +static int bits_per_byte = 8; + +/* The routines that read and process dies for a C struct or C++ class + pass lists of data member fields and lists of member function fields + in an instance of a field_info structure, as defined below. */ +struct field_info +{ + /* List of data member and baseclasses fields. */ + struct nextfield + { + struct nextfield *next; + int accessibility; + int virtuality; + struct field field; + } *fields; + + /* Number of fields. */ + int nfields; + + /* Number of baseclasses. */ + int nbaseclasses; + + /* Set if the accesibility of one of the fields is not public. */ + int non_public_fields; + + /* Member function fields array, entries are allocated in the order they + are encountered in the object file. */ + struct nextfnfield + { + struct nextfnfield *next; + struct fn_field fnfield; + } *fnfields; + + /* Member function fieldlist array, contains name of possibly overloaded + member function, number of overloaded member functions and a pointer + to the head of the member function field chain. */ + struct fnfieldlist + { + char *name; + int length; + struct nextfnfield *head; + } *fnfieldlists; + + /* Number of entries in the fnfieldlists array. */ + int nfnfields; +}; + +/* FIXME: Kludge to mark a varargs function type for C++ member function + argument processing. */ +#define TYPE_FLAG_VARARGS (1 << 10) + +/* Dwarf2 has no clean way to discern C++ static and non-static member + functions. G++ helps GDB by marking the first parameter for non-static + member functions (which is the this pointer) as artificial. + We pass this information between dwarf2_add_member_fn and + read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */ +#define TYPE_FIELD_ARTIFICIAL TYPE_FIELD_BITPOS + +/* Various complaints about symbol reading that don't abort the process */ + +static struct complaint dwarf2_const_ignored = +{ + "type qualifier 'const' ignored", 0, 0 +}; +static struct complaint dwarf2_volatile_ignored = +{ + "type qualifier 'volatile' ignored", 0, 0 +}; +static struct complaint dwarf2_non_const_array_bound_ignored = +{ + "non-constant array bounds form '%s' ignored", 0, 0 +}; +static struct complaint dwarf2_missing_line_number_section = +{ + "missing .debug_line section", 0, 0 +}; +static struct complaint dwarf2_mangled_line_number_section = +{ + "mangled .debug_line section", 0, 0 +}; +static struct complaint dwarf2_unsupported_die_ref_attr = +{ + "unsupported die ref attribute form: '%s'", 0, 0 +}; +static struct complaint dwarf2_unsupported_stack_op = +{ + "unsupported stack op: '%s'", 0, 0 +}; +static struct complaint dwarf2_unsupported_tag = +{ + "unsupported tag: '%s'", 0, 0 +}; +static struct complaint dwarf2_unsupported_at_encoding = +{ + "unsupported DW_AT_encoding: '%s'", 0, 0 +}; +static struct complaint dwarf2_unsupported_at_frame_base = +{ + "unsupported DW_AT_frame_base for function '%s'", 0, 0 +}; +static struct complaint dwarf2_unexpected_tag = +{ + "unexepected tag in read_type_die: '%s'", 0, 0 +}; +static struct complaint dwarf2_missing_at_frame_base = +{ + "DW_AT_frame_base missing for DW_OP_fbreg", 0, 0 +}; +static struct complaint dwarf2_bad_static_member_name = +{ + "unrecognized static data member name '%s'", 0, 0 +}; +static struct complaint dwarf2_unsupported_accessibility = +{ + "unsupported accessibility %d", 0, 0 +}; +static struct complaint dwarf2_bad_member_name_complaint = +{ + "cannot extract member name from '%s'", 0, 0 +}; +static struct complaint dwarf2_missing_member_fn_type_complaint = +{ + "member function type missing for '%s'", 0, 0 +}; +static struct complaint dwarf2_vtbl_not_found_complaint = +{ + "virtual function table pointer not found when defining class '%s'", 0, 0 +}; +static struct complaint dwarf2_absolute_sibling_complaint = +{ + "ignoring absolute DW_AT_sibling", 0, 0 +}; +static struct complaint dwarf2_const_value_length_mismatch = +{ + "const value length mismatch for '%s', got %d, expected %d", 0, 0 +}; +static struct complaint dwarf2_unsupported_const_value_attr = +{ + "unsupported const value attribute form: '%s'", 0, 0 +}; + +/* Remember the addr_size read from the dwarf. + If a target expects to link compilation units with differing address + sizes, gdb needs to be sure that the appropriate size is here for + whatever scope is currently getting read. */ +static int address_size; + +/* Some elf32 object file formats while linked for a 32 bit address + space contain debug information that has assumed 64 bit + addresses. Eg 64 bit MIPS target produced by GCC/GAS/LD where the + symbol table contains 32bit address values while its .debug_info + section contains 64 bit address values. + ADDRESS_SIGNIFICANT_SIZE specifies the number significant bits in + the ADDRESS_SIZE bytes read from the file */ +static int address_significant_size; + +/* Externals references. */ +extern int info_verbose; /* From main.c; nonzero => verbose */ + +/* local function prototypes */ + +static void dwarf2_locate_sections PARAMS ((bfd *, asection *, PTR)); + +#if 0 +static void dwarf2_build_psymtabs_easy PARAMS ((struct objfile *, + struct section_offsets *, + int)); +#endif + +static void dwarf2_build_psymtabs_hard PARAMS ((struct objfile *, + struct section_offsets *, + int)); + +static char *scan_partial_symbols PARAMS ((char *, struct objfile *, + CORE_ADDR *, CORE_ADDR *)); + +static void add_partial_symbol PARAMS ((struct partial_die_info *, + struct objfile *)); + +static void dwarf2_psymtab_to_symtab PARAMS ((struct partial_symtab *)); + +static void psymtab_to_symtab_1 PARAMS ((struct partial_symtab *)); + +static char *dwarf2_read_section PARAMS ((struct objfile *, file_ptr, + unsigned int)); + +static void dwarf2_read_abbrevs PARAMS ((bfd *, unsigned int)); + +static void dwarf2_empty_abbrev_table PARAMS ((PTR)); + +static struct abbrev_info *dwarf2_lookup_abbrev PARAMS ((unsigned int)); + +static char *read_partial_die PARAMS ((struct partial_die_info *, + bfd *, char *, int *)); + +static char *read_full_die PARAMS ((struct die_info **, bfd *, char *)); + +static char *read_attribute PARAMS ((struct attribute *, struct attr_abbrev *, + bfd *, char *)); + +static unsigned int read_1_byte PARAMS ((bfd *, char *)); + +static int read_1_signed_byte PARAMS ((bfd *, char *)); + +static unsigned int read_2_bytes PARAMS ((bfd *, char *)); + +static unsigned int read_4_bytes PARAMS ((bfd *, char *)); + +static unsigned int read_8_bytes PARAMS ((bfd *, char *)); + +static CORE_ADDR read_address PARAMS ((bfd *, char *)); + +static char *read_n_bytes PARAMS ((bfd *, char *, unsigned int)); + +static char *read_string PARAMS ((bfd *, char *, unsigned int *)); + +static unsigned int read_unsigned_leb128 PARAMS ((bfd *, char *, + unsigned int *)); + +static int read_signed_leb128 PARAMS ((bfd *, char *, unsigned int *)); + +static void set_cu_language PARAMS ((unsigned int)); + +static struct attribute *dwarf_attr PARAMS ((struct die_info *, + unsigned int)); + +static void dwarf_decode_lines PARAMS ((unsigned int, char *, bfd *)); + +static void dwarf2_start_subfile PARAMS ((char *, char *)); + +static struct symbol *new_symbol PARAMS ((struct die_info *, struct type *, + struct objfile *)); + +static void dwarf2_const_value PARAMS ((struct attribute *, struct symbol *, + struct objfile *)); + +static struct type *die_type PARAMS ((struct die_info *, struct objfile *)); + +static struct type *die_containing_type PARAMS ((struct die_info *, + struct objfile *)); + +#if 0 +static struct type *type_at_offset PARAMS ((unsigned int, struct objfile *)); +#endif + +static struct type *tag_type_to_type PARAMS ((struct die_info *, + struct objfile *)); + +static void read_type_die PARAMS ((struct die_info *, struct objfile *)); + +static void read_typedef PARAMS ((struct die_info *, struct objfile *)); + +static void read_base_type PARAMS ((struct die_info *, struct objfile *)); + +static void read_file_scope PARAMS ((struct die_info *, struct objfile *)); + +static void read_func_scope PARAMS ((struct die_info *, struct objfile *)); + +static void read_lexical_block_scope PARAMS ((struct die_info *, + struct objfile *)); + +static int dwarf2_get_pc_bounds PARAMS ((struct die_info *, + CORE_ADDR *, CORE_ADDR *, + struct objfile *)); + +static void dwarf2_add_field PARAMS ((struct field_info *, struct die_info *, + struct objfile *)); + +static void dwarf2_attach_fields_to_type PARAMS ((struct field_info *, + struct type *, + struct objfile *)); + +static char *skip_member_fn_name PARAMS ((char *)); + +static void dwarf2_add_member_fn PARAMS ((struct field_info *, + struct die_info *, struct type *, + struct objfile *objfile)); + +static void dwarf2_attach_fn_fields_to_type PARAMS ((struct field_info *, + struct type *, + struct objfile *)); + +static void read_structure_scope PARAMS ((struct die_info *, struct objfile *)); + +static void read_common_block PARAMS ((struct die_info *, struct objfile *)); + +static void read_enumeration PARAMS ((struct die_info *, struct objfile *)); + +static struct type *dwarf_base_type PARAMS ((int, int, struct objfile *)); + +static CORE_ADDR decode_locdesc PARAMS ((struct dwarf_block *, + struct objfile *)); + +static void read_array_type PARAMS ((struct die_info *, struct objfile *)); + +static void read_tag_pointer_type PARAMS ((struct die_info *, + struct objfile *)); + +static void read_tag_ptr_to_member_type PARAMS ((struct die_info *, + struct objfile *)); + +static void read_tag_reference_type PARAMS ((struct die_info *, + struct objfile *)); + +static void read_tag_const_type PARAMS ((struct die_info *, struct objfile *)); + +static void read_tag_volatile_type PARAMS ((struct die_info *, + struct objfile *)); + +static void read_tag_string_type PARAMS ((struct die_info *, + struct objfile *)); + +static void read_subroutine_type PARAMS ((struct die_info *, + struct objfile *)); + +struct die_info *read_comp_unit PARAMS ((char *, bfd *)); + +static void free_die_list PARAMS ((struct die_info *)); + +static void process_die PARAMS ((struct die_info *, struct objfile *)); + +static char *dwarf2_linkage_name PARAMS ((struct die_info *)); + +static char *dwarf_tag_name PARAMS ((unsigned int)); + +static char *dwarf_attr_name PARAMS ((unsigned int)); + +static char *dwarf_form_name PARAMS ((unsigned int)); + +static char *dwarf_stack_op_name PARAMS ((unsigned int)); + +static char *dwarf_bool_name PARAMS ((unsigned int)); + +static char *dwarf_type_encoding_name PARAMS ((unsigned int)); + +#if 0 +static char *dwarf_cfi_name PARAMS ((unsigned int)); + +struct die_info *copy_die PARAMS ((struct die_info *)); +#endif + +struct die_info *sibling_die PARAMS ((struct die_info *)); + +void dump_die PARAMS ((struct die_info *)); + +void dump_die_list PARAMS ((struct die_info *)); + +void store_in_ref_table PARAMS ((unsigned int, struct die_info *)); + +static void dwarf2_empty_die_ref_table PARAMS ((void)); + +static unsigned int dwarf2_get_ref_die_offset PARAMS ((struct attribute *)); + +struct die_info *follow_die_ref PARAMS ((unsigned int)); + +static struct type *dwarf2_fundamental_type PARAMS ((struct objfile *, int)); + +/* memory allocation interface */ + +static void dwarf2_free_tmp_obstack PARAMS ((PTR)); + +static struct dwarf_block *dwarf_alloc_block PARAMS ((void)); + +static struct abbrev_info *dwarf_alloc_abbrev PARAMS ((void)); + +static struct die_info *dwarf_alloc_die PARAMS ((void)); + +/* Try to locate the sections we need for DWARF 2 debugging + information and return true if we have enough to do something. */ + +int +dwarf2_has_info (abfd) + bfd *abfd; +{ + dwarf_info_offset = dwarf_abbrev_offset = dwarf_line_offset = 0; + bfd_map_over_sections (abfd, dwarf2_locate_sections, NULL); + if (dwarf_info_offset && dwarf_abbrev_offset) + { + return 1; + } + else + { + return 0; + } +} + +/* This function is mapped across the sections and remembers the + offset and size of each of the debugging sections we are interested + in. */ + +static void +dwarf2_locate_sections (ignore_abfd, sectp, ignore_ptr) + bfd *ignore_abfd; + asection *sectp; + PTR ignore_ptr; +{ + if (STREQ (sectp->name, INFO_SECTION)) + { + dwarf_info_offset = sectp->filepos; + dwarf_info_size = bfd_get_section_size_before_reloc (sectp); + } + else if (STREQ (sectp->name, ABBREV_SECTION)) + { + dwarf_abbrev_offset = sectp->filepos; + dwarf_abbrev_size = bfd_get_section_size_before_reloc (sectp); + } + else if (STREQ (sectp->name, LINE_SECTION)) + { + dwarf_line_offset = sectp->filepos; + dwarf_line_size = bfd_get_section_size_before_reloc (sectp); + } + else if (STREQ (sectp->name, PUBNAMES_SECTION)) + { + dwarf_pubnames_offset = sectp->filepos; + dwarf_pubnames_size = bfd_get_section_size_before_reloc (sectp); + } + else if (STREQ (sectp->name, ARANGES_SECTION)) + { + dwarf_aranges_offset = sectp->filepos; + dwarf_aranges_size = bfd_get_section_size_before_reloc (sectp); + } + else if (STREQ (sectp->name, LOC_SECTION)) + { + dwarf_loc_offset = sectp->filepos; + dwarf_loc_size = bfd_get_section_size_before_reloc (sectp); + } + else if (STREQ (sectp->name, MACINFO_SECTION)) + { + dwarf_macinfo_offset = sectp->filepos; + dwarf_macinfo_size = bfd_get_section_size_before_reloc (sectp); + } + else if (STREQ (sectp->name, STR_SECTION)) + { + dwarf_str_offset = sectp->filepos; + dwarf_str_size = bfd_get_section_size_before_reloc (sectp); + } +} + +/* Build a partial symbol table. */ + +void +dwarf2_build_psymtabs (objfile, section_offsets, mainline) + struct objfile *objfile; + struct section_offsets *section_offsets; + int mainline; +{ + + /* We definitely need the .debug_info and .debug_abbrev sections */ + + dwarf_info_buffer = dwarf2_read_section (objfile, + dwarf_info_offset, + dwarf_info_size); + dwarf_abbrev_buffer = dwarf2_read_section (objfile, + dwarf_abbrev_offset, + dwarf_abbrev_size); + dwarf_line_buffer = dwarf2_read_section (objfile, + dwarf_line_offset, + dwarf_line_size); + + if (mainline || objfile->global_psymbols.size == 0 || + objfile->static_psymbols.size == 0) + { + init_psymbol_list (objfile, 1024); + } + +#if 0 + if (dwarf_aranges_offset && dwarf_pubnames_offset) + { + /* Things are significanlty easier if we have .debug_aranges and + .debug_pubnames sections */ + + dwarf2_build_psymtabs_easy (objfile, section_offsets, mainline); + } + else +#endif + /* only test this case for now */ + { + /* In this case we have to work a bit harder */ + dwarf2_build_psymtabs_hard (objfile, section_offsets, mainline); + } +} + +#if 0 +/* Build the partial symbol table from the information in the + .debug_pubnames and .debug_aranges sections. */ + +static void +dwarf2_build_psymtabs_easy (objfile, section_offsets, mainline) + struct objfile *objfile; + struct section_offsets *section_offsets; + int mainline; +{ + bfd *abfd = objfile->obfd; + char *aranges_buffer, *pubnames_buffer; + char *aranges_ptr, *pubnames_ptr; + unsigned int entry_length, version, info_offset, info_size; + + pubnames_buffer = dwarf2_read_section (objfile, + dwarf_pubnames_offset, + dwarf_pubnames_size); + pubnames_ptr = pubnames_buffer; + while ((pubnames_ptr - pubnames_buffer) < dwarf_pubnames_size) + { + entry_length = read_4_bytes (abfd, pubnames_ptr); + pubnames_ptr += 4; + version = read_1_byte (abfd, pubnames_ptr); + pubnames_ptr += 1; + info_offset = read_4_bytes (abfd, pubnames_ptr); + pubnames_ptr += 4; + info_size = read_4_bytes (abfd, pubnames_ptr); + pubnames_ptr += 4; + } + + aranges_buffer = dwarf2_read_section (objfile, + dwarf_aranges_offset, + dwarf_aranges_size); + +} +#endif + +/* Build the partial symbol table by doing a quick pass through the + .debug_info and .debug_abbrev sections. */ + +static void +dwarf2_build_psymtabs_hard (objfile, section_offsets, mainline) + struct objfile *objfile; + struct section_offsets *section_offsets; + int mainline; +{ + /* Instead of reading this into a big buffer, we should probably use + mmap() on architectures that support it. (FIXME) */ + bfd *abfd = objfile->obfd; + char *info_ptr, *abbrev_ptr; + char *beg_of_comp_unit; + struct comp_unit_head cu_header; + struct partial_die_info comp_unit_die; + struct partial_symtab *pst; + struct cleanup *back_to; + int comp_unit_has_pc_info; + CORE_ADDR lowpc, highpc; + + /* Number of bytes of any addresses that are signficant */ + address_significant_size = get_elf_backend_data (abfd)->s->arch_size / 8; + + info_ptr = dwarf_info_buffer; + abbrev_ptr = dwarf_abbrev_buffer; + + obstack_init (&dwarf2_tmp_obstack); + back_to = make_cleanup (dwarf2_free_tmp_obstack, NULL); + + while ((unsigned int) (info_ptr - dwarf_info_buffer) + + ((info_ptr - dwarf_info_buffer) % 4) < dwarf_info_size) + { + beg_of_comp_unit = info_ptr; + cu_header.length = read_4_bytes (abfd, info_ptr); + info_ptr += 4; + cu_header.version = read_2_bytes (abfd, info_ptr); + info_ptr += 2; + cu_header.abbrev_offset = read_4_bytes (abfd, info_ptr); + info_ptr += 4; + cu_header.addr_size = read_1_byte (abfd, info_ptr); + info_ptr += 1; + address_size = cu_header.addr_size; + + if (cu_header.version != 2) + { + error ("Dwarf Error: wrong version in compilation unit header."); + return; + } + if (cu_header.abbrev_offset >= dwarf_abbrev_size) + { + error ("Dwarf Error: bad offset (0x%lx) in compilation unit header (offset 0x%lx + 6).", + (long) cu_header.abbrev_offset, + (long) (beg_of_comp_unit - dwarf_info_buffer)); + return; + } + if (beg_of_comp_unit + cu_header.length + 4 + > dwarf_info_buffer + dwarf_info_size) + { + error ("Dwarf Error: bad length (0x%lx) in compilation unit header (offset 0x%lx + 0).", + (long) cu_header.length, + (long) (beg_of_comp_unit - dwarf_info_buffer)); + return; + } + if (address_size < address_significant_size) + { + error ("Dwarf Error: bad address size (%ld) in compilation unit header (offset 0x%lx + 11).", + (long) cu_header.addr_size, + (long) (beg_of_comp_unit - dwarf_info_buffer)); + } + + /* Read the abbrevs for this compilation unit into a table */ + dwarf2_read_abbrevs (abfd, cu_header.abbrev_offset); + make_cleanup (dwarf2_empty_abbrev_table, NULL); + + /* Read the compilation unit die */ + info_ptr = read_partial_die (&comp_unit_die, abfd, + info_ptr, &comp_unit_has_pc_info); + + /* Set the language we're debugging */ + set_cu_language (comp_unit_die.language); + + /* Allocate a new partial symbol table structure */ + pst = start_psymtab_common (objfile, section_offsets, + comp_unit_die.name ? comp_unit_die.name : "", + comp_unit_die.lowpc, + objfile->global_psymbols.next, + objfile->static_psymbols.next); + + pst->read_symtab_private = (char *) + obstack_alloc (&objfile->psymbol_obstack, sizeof (struct dwarf2_pinfo)); + cu_header_offset = beg_of_comp_unit - dwarf_info_buffer; + DWARF_INFO_BUFFER(pst) = dwarf_info_buffer; + DWARF_INFO_OFFSET(pst) = beg_of_comp_unit - dwarf_info_buffer; + DWARF_ABBREV_BUFFER(pst) = dwarf_abbrev_buffer; + DWARF_ABBREV_SIZE(pst) = dwarf_abbrev_size; + DWARF_LINE_BUFFER(pst) = dwarf_line_buffer; + baseaddr = ANOFFSET (section_offsets, 0); + + /* Store the function that reads in the rest of the symbol table */ + pst->read_symtab = dwarf2_psymtab_to_symtab; + + /* Check if comp unit has_children. + If so, read the rest of the partial symbols from this comp unit. + If not, there's no more debug_info for this comp unit. */ + if (comp_unit_die.has_children) + { + info_ptr = scan_partial_symbols (info_ptr, objfile, &lowpc, &highpc); + + /* If the compilation unit didn't have an explicit address range, + then use the information extracted from its child dies. */ + if (!comp_unit_has_pc_info) + { + comp_unit_die.lowpc = lowpc; + comp_unit_die.highpc = highpc; + } + } + pst->textlow = comp_unit_die.lowpc + baseaddr; + pst->texthigh = comp_unit_die.highpc + baseaddr; + + pst->n_global_syms = objfile->global_psymbols.next - + (objfile->global_psymbols.list + pst->globals_offset); + pst->n_static_syms = objfile->static_psymbols.next - + (objfile->static_psymbols.list + pst->statics_offset); + sort_pst_symbols (pst); + + /* If there is already a psymtab or symtab for a file of this + name, remove it. (If there is a symtab, more drastic things + also happen.) This happens in VxWorks. */ + free_named_symtabs (pst->filename); + + info_ptr = beg_of_comp_unit + cu_header.length + 4; + } + do_cleanups (back_to); +} + +/* Read in all interesting dies to the end of the compilation unit. */ + +static char * +scan_partial_symbols (info_ptr, objfile, lowpc, highpc) + char *info_ptr; + struct objfile *objfile; + CORE_ADDR *lowpc; + CORE_ADDR *highpc; +{ + bfd *abfd = objfile->obfd; + struct partial_die_info pdi; + + /* This function is called after we've read in the comp_unit_die in + order to read its children. We start the nesting level at 1 since + we have pushed 1 level down in order to read the comp unit's children. + The comp unit itself is at level 0, so we stop reading when we pop + back to that level. */ + + int nesting_level = 1; + int has_pc_info; + + *lowpc = ((CORE_ADDR) -1); + *highpc = ((CORE_ADDR) 0); + + while (nesting_level) + { + info_ptr = read_partial_die (&pdi, abfd, info_ptr, &has_pc_info); + + if (pdi.name) + { + switch (pdi.tag) + { + case DW_TAG_subprogram: + if (has_pc_info) + { + if (pdi.lowpc < *lowpc) + { + *lowpc = pdi.lowpc; + } + if (pdi.highpc > *highpc) + { + *highpc = pdi.highpc; + } + if ((pdi.is_external || nesting_level == 1) + && !pdi.is_declaration) + { + add_partial_symbol (&pdi, objfile); + } + } + break; + case DW_TAG_variable: + case DW_TAG_typedef: + case DW_TAG_class_type: + case DW_TAG_structure_type: + case DW_TAG_union_type: + case DW_TAG_enumeration_type: + if ((pdi.is_external || nesting_level == 1) + && !pdi.is_declaration) + { + add_partial_symbol (&pdi, objfile); + } + break; + case DW_TAG_enumerator: + /* File scope enumerators are added to the partial symbol + table. */ + if (nesting_level == 2) + add_partial_symbol (&pdi, objfile); + break; + case DW_TAG_base_type: + /* File scope base type definitions are added to the partial + symbol table. */ + if (nesting_level == 1) + add_partial_symbol (&pdi, objfile); + break; + default: + break; + } + } + + /* If the die has a sibling, skip to the sibling. + Do not skip enumeration types, we want to record their + enumerators. */ + if (pdi.sibling && pdi.tag != DW_TAG_enumeration_type) + { + info_ptr = pdi.sibling; + } + else if (pdi.has_children) + { + /* Die has children, but the optional DW_AT_sibling attribute + is missing. */ + nesting_level++; + } + + if (pdi.tag == 0) + { + nesting_level--; + } + } + + /* If we didn't find a lowpc, set it to highpc to avoid complaints + from `maint check'. */ + if (*lowpc == ((CORE_ADDR) -1)) + *lowpc = *highpc; + return info_ptr; +} + +static void +add_partial_symbol (pdi, objfile) + struct partial_die_info *pdi; + struct objfile *objfile; +{ + CORE_ADDR addr = 0; + + switch (pdi->tag) + { + case DW_TAG_subprogram: + if (pdi->is_external) + { + /*prim_record_minimal_symbol (pdi->name, pdi->lowpc + baseaddr, + mst_text, objfile);*/ + add_psymbol_to_list (pdi->name, strlen (pdi->name), + VAR_NAMESPACE, LOC_BLOCK, + &objfile->global_psymbols, + 0, pdi->lowpc + baseaddr, cu_language, objfile); + } + else + { + /*prim_record_minimal_symbol (pdi->name, pdi->lowpc + baseaddr, + mst_file_text, objfile);*/ + add_psymbol_to_list (pdi->name, strlen (pdi->name), + VAR_NAMESPACE, LOC_BLOCK, + &objfile->static_psymbols, + 0, pdi->lowpc + baseaddr, cu_language, objfile); + } + break; + case DW_TAG_variable: + if (pdi->is_external) + { + /* Global Variable. + Don't enter into the minimal symbol tables as there is + a minimal symbol table entry from the ELF symbols already. + Enter into partial symbol table if it has a location + descriptor or a type. + If the location descriptor is missing, new_symbol will create + a LOC_UNRESOLVED symbol, the address of the variable will then + be determined from the minimal symbol table whenever the variable + is referenced. + The address for the partial symbol table entry is not + used by GDB, but it comes in handy for debugging partial symbol + table building. */ + + if (pdi->locdesc) + addr = decode_locdesc (pdi->locdesc, objfile); + if (pdi->locdesc || pdi->has_type) + add_psymbol_to_list (pdi->name, strlen (pdi->name), + VAR_NAMESPACE, LOC_STATIC, + &objfile->global_psymbols, + 0, addr + baseaddr, cu_language, objfile); + } + else + { + /* Static Variable. Skip symbols without location descriptors. */ + if (pdi->locdesc == NULL) + return; + addr = decode_locdesc (pdi->locdesc, objfile); + /*prim_record_minimal_symbol (pdi->name, addr + baseaddr, + mst_file_data, objfile);*/ + add_psymbol_to_list (pdi->name, strlen (pdi->name), + VAR_NAMESPACE, LOC_STATIC, + &objfile->static_psymbols, + 0, addr + baseaddr, cu_language, objfile); + } + break; + case DW_TAG_typedef: + case DW_TAG_base_type: + add_psymbol_to_list (pdi->name, strlen (pdi->name), + VAR_NAMESPACE, LOC_TYPEDEF, + &objfile->static_psymbols, + 0, (CORE_ADDR) 0, cu_language, objfile); + break; + case DW_TAG_class_type: + case DW_TAG_structure_type: + case DW_TAG_union_type: + case DW_TAG_enumeration_type: + /* Skip aggregate types without children, these are external + references. */ + if (pdi->has_children == 0) + return; + add_psymbol_to_list (pdi->name, strlen (pdi->name), + STRUCT_NAMESPACE, LOC_TYPEDEF, + &objfile->static_psymbols, + 0, (CORE_ADDR) 0, cu_language, objfile); + + if (cu_language == language_cplus) + { + /* For C++, these implicitly act as typedefs as well. */ + add_psymbol_to_list (pdi->name, strlen (pdi->name), + VAR_NAMESPACE, LOC_TYPEDEF, + &objfile->static_psymbols, + 0, (CORE_ADDR) 0, cu_language, objfile); + } + break; + case DW_TAG_enumerator: + add_psymbol_to_list (pdi->name, strlen (pdi->name), + VAR_NAMESPACE, LOC_CONST, + &objfile->static_psymbols, + 0, (CORE_ADDR) 0, cu_language, objfile); + break; + default: + break; + } +} + +/* Expand this partial symbol table into a full symbol table. */ + +static void +dwarf2_psymtab_to_symtab (pst) + struct partial_symtab *pst; +{ + /* FIXME: This is barely more than a stub. */ + if (pst != NULL) + { + if (pst->readin) + { + warning ("bug: psymtab for %s is already read in.", pst->filename); + } + else + { + if (info_verbose) + { + printf_filtered ("Reading in symbols for %s...", pst->filename); + gdb_flush (gdb_stdout); + } + + psymtab_to_symtab_1 (pst); + + /* Finish up the debug error message. */ + if (info_verbose) + printf_filtered ("done.\n"); + } + } +} + +static void +psymtab_to_symtab_1 (pst) + struct partial_symtab *pst; +{ + struct objfile *objfile = pst->objfile; + bfd *abfd = objfile->obfd; + struct comp_unit_head cu_header; + struct die_info *dies; + unsigned long offset; + CORE_ADDR lowpc, highpc; + struct die_info *child_die; + char *info_ptr; + struct symtab *symtab; + struct cleanup *back_to; + + /* Set local variables from the partial symbol table info. */ + offset = DWARF_INFO_OFFSET(pst); + dwarf_info_buffer = DWARF_INFO_BUFFER(pst); + dwarf_abbrev_buffer = DWARF_ABBREV_BUFFER(pst); + dwarf_abbrev_size = DWARF_ABBREV_SIZE(pst); + dwarf_line_buffer = DWARF_LINE_BUFFER(pst); + baseaddr = ANOFFSET (pst->section_offsets, 0); + cu_header_offset = offset; + info_ptr = dwarf_info_buffer + offset; + + obstack_init (&dwarf2_tmp_obstack); + back_to = make_cleanup (dwarf2_free_tmp_obstack, NULL); + + buildsym_init (); + make_cleanup ((make_cleanup_func) really_free_pendings, NULL); + + /* read in the comp_unit header */ + cu_header.length = read_4_bytes (abfd, info_ptr); + info_ptr += 4; + cu_header.version = read_2_bytes (abfd, info_ptr); + info_ptr += 2; + cu_header.abbrev_offset = read_4_bytes (abfd, info_ptr); + info_ptr += 4; + cu_header.addr_size = read_1_byte (abfd, info_ptr); + info_ptr += 1; + + /* Read the abbrevs for this compilation unit */ + dwarf2_read_abbrevs (abfd, cu_header.abbrev_offset); + make_cleanup (dwarf2_empty_abbrev_table, NULL); + + dies = read_comp_unit (info_ptr, abfd); + + make_cleanup ((make_cleanup_func) free_die_list, dies); + + /* Do line number decoding in read_file_scope () */ + process_die (dies, objfile); + + if (!dwarf2_get_pc_bounds (dies, &lowpc, &highpc, objfile)) + { + /* Some compilers don't define a DW_AT_high_pc attribute for + the compilation unit. If the DW_AT_high_pc is missing, + synthesize it, by scanning the DIE's below the compilation unit. */ + highpc = 0; + if (dies->has_children) + { + child_die = dies->next; + while (child_die && child_die->tag) + { + if (child_die->tag == DW_TAG_subprogram) + { + CORE_ADDR low, high; + + if (dwarf2_get_pc_bounds (child_die, &low, &high, objfile)) + { + highpc = max (highpc, high); + } + } + child_die = sibling_die (child_die); + } + } + } + symtab = end_symtab (highpc + baseaddr, objfile, 0); + + /* Set symtab language to language from DW_AT_language. + If the compilation is from a C file generated by language preprocessors, + do not set the language if it was already deduced by start_subfile. */ + if (symtab != NULL + && !(cu_language == language_c && symtab->language != language_c)) + { + symtab->language = cu_language; + } + pst->symtab = symtab; + pst->readin = 1; + sort_symtab_syms (pst->symtab); + + do_cleanups (back_to); +} + +/* Process a die and its children. */ + +static void +process_die (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + switch (die->tag) + { + case DW_TAG_padding: + break; + case DW_TAG_compile_unit: + read_file_scope (die, objfile); + break; + case DW_TAG_subprogram: + read_subroutine_type (die, objfile); + read_func_scope (die, objfile); + break; + case DW_TAG_inlined_subroutine: + /* FIXME: These are ignored for now. + They could be used to set breakpoints on all inlined instances + of a function and make GDB `next' properly over inlined functions. */ + break; + case DW_TAG_lexical_block: + read_lexical_block_scope (die, objfile); + break; + case DW_TAG_class_type: + case DW_TAG_structure_type: + case DW_TAG_union_type: + read_structure_scope (die, objfile); + break; + case DW_TAG_enumeration_type: + read_enumeration (die, objfile); + break; + case DW_TAG_subroutine_type: + read_subroutine_type (die, objfile); + break; + case DW_TAG_array_type: + read_array_type (die, objfile); + break; + case DW_TAG_pointer_type: + read_tag_pointer_type (die, objfile); + break; + case DW_TAG_ptr_to_member_type: + read_tag_ptr_to_member_type (die, objfile); + break; + case DW_TAG_reference_type: + read_tag_reference_type (die, objfile); + break; + case DW_TAG_string_type: + read_tag_string_type (die, objfile); + break; + case DW_TAG_base_type: + read_base_type (die, objfile); + if (dwarf_attr (die, DW_AT_name)) + { + /* Add a typedef symbol for the base type definition. */ + new_symbol (die, die->type, objfile); + } + break; + case DW_TAG_common_block: + read_common_block (die, objfile); + break; + case DW_TAG_common_inclusion: + break; + default: + new_symbol (die, NULL, objfile); + break; + } +} + +static void +read_file_scope (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + unsigned int line_offset = 0; + CORE_ADDR lowpc = ((CORE_ADDR) -1); + CORE_ADDR highpc = ((CORE_ADDR) 0); + struct attribute *attr; + char *name = "<unknown>"; + char *comp_dir = NULL; + struct die_info *child_die; + bfd *abfd = objfile->obfd; + + if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, objfile)) + { + if (die->has_children) + { + child_die = die->next; + while (child_die && child_die->tag) + { + if (child_die->tag == DW_TAG_subprogram) + { + CORE_ADDR low, high; + + if (dwarf2_get_pc_bounds (child_die, &low, &high, objfile)) + { + lowpc = min (lowpc, low); + highpc = max (highpc, high); + } + } + child_die = sibling_die (child_die); + } + } + } + + /* If we didn't find a lowpc, set it to highpc to avoid complaints + from finish_block. */ + if (lowpc == ((CORE_ADDR) -1)) + lowpc = highpc; + lowpc += baseaddr; + highpc += baseaddr; + + attr = dwarf_attr (die, DW_AT_name); + if (attr) + { + name = DW_STRING (attr); + } + attr = dwarf_attr (die, DW_AT_comp_dir); + if (attr) + { + comp_dir = DW_STRING (attr); + if (comp_dir) + { + /* Irix 6.2 native cc prepends <machine>.: to the compilation + directory, get rid of it. */ + char *cp = strchr (comp_dir, ':'); + + if (cp && cp != comp_dir && cp[-1] == '.' && cp[1] == '/') + comp_dir = cp + 1; + } + } + + if (objfile->ei.entry_point >= lowpc && + objfile->ei.entry_point < highpc) + { + objfile->ei.entry_file_lowpc = lowpc; + objfile->ei.entry_file_highpc = highpc; + } + + attr = dwarf_attr (die, DW_AT_language); + if (attr) + { + set_cu_language (DW_UNSND (attr)); + } + + /* We assume that we're processing GCC output. */ + processing_gcc_compilation = 2; +#if 0 + /* FIXME:Do something here. */ + if (dip->at_producer != NULL) + { + handle_producer (dip->at_producer); + } +#endif + + /* The compilation unit may be in a different language or objfile, + zero out all remembered fundamental types. */ + memset (ftypes, 0, FT_NUM_MEMBERS * sizeof (struct type *)); + + start_symtab (name, comp_dir, lowpc); + record_debugformat ("DWARF 2"); + + /* Decode line number information if present. */ + attr = dwarf_attr (die, DW_AT_stmt_list); + if (attr) + { + line_offset = DW_UNSND (attr); + dwarf_decode_lines (line_offset, comp_dir, abfd); + } + + /* Process all dies in compilation unit. */ + if (die->has_children) + { + child_die = die->next; + while (child_die && child_die->tag) + { + process_die (child_die, objfile); + child_die = sibling_die (child_die); + } + } +} + +static void +read_func_scope (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + register struct context_stack *new; + CORE_ADDR lowpc; + CORE_ADDR highpc; + struct die_info *child_die; + struct attribute *attr; + char *name; + + name = dwarf2_linkage_name (die); + + /* Ignore functions with missing or empty names and functions with + missing or invalid low and high pc attributes. */ + if (name == NULL || !dwarf2_get_pc_bounds (die, &lowpc, &highpc, objfile)) + return; + + lowpc += baseaddr; + highpc += baseaddr; + + if (objfile->ei.entry_point >= lowpc && + objfile->ei.entry_point < highpc) + { + objfile->ei.entry_func_lowpc = lowpc; + objfile->ei.entry_func_highpc = highpc; + } + + if (STREQ (name, "main")) /* FIXME: hardwired name */ + { + objfile->ei.main_func_lowpc = lowpc; + objfile->ei.main_func_highpc = highpc; + } + + /* Decode DW_AT_frame_base location descriptor if present, keep result + for DW_OP_fbreg operands in decode_locdesc. */ + frame_base_reg = -1; + frame_base_offset = 0; + attr = dwarf_attr (die, DW_AT_frame_base); + if (attr) + { + CORE_ADDR addr = decode_locdesc (DW_BLOCK (attr), objfile); + if (isreg) + frame_base_reg = addr; + else if (offreg) + { + frame_base_reg = basereg; + frame_base_offset = addr; + } + else + complain (&dwarf2_unsupported_at_frame_base, name); + } + + new = push_context (0, lowpc); + new->name = new_symbol (die, die->type, objfile); + list_in_scope = &local_symbols; + + if (die->has_children) + { + child_die = die->next; + while (child_die && child_die->tag) + { + process_die (child_die, objfile); + child_die = sibling_die (child_die); + } + } + + new = pop_context (); + /* Make a block for the local symbols within. */ + finish_block (new->name, &local_symbols, new->old_blocks, + lowpc, highpc, objfile); + list_in_scope = &file_symbols; +} + +/* Process all the DIES contained within a lexical block scope. Start + a new scope, process the dies, and then close the scope. */ + +static void +read_lexical_block_scope (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + register struct context_stack *new; + CORE_ADDR lowpc, highpc; + struct die_info *child_die; + + /* Ignore blocks with missing or invalid low and high pc attributes. */ + if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, objfile)) + return; + lowpc += baseaddr; + highpc += baseaddr; + + push_context (0, lowpc); + if (die->has_children) + { + child_die = die->next; + while (child_die && child_die->tag) + { + process_die (child_die, objfile); + child_die = sibling_die (child_die); + } + } + new = pop_context (); + + if (local_symbols != NULL) + { + finish_block (0, &local_symbols, new->old_blocks, new->start_addr, + highpc, objfile); + } + local_symbols = new->locals; +} + +/* Get low and high pc attributes from a die. + Return 1 if the attributes are present and valid, otherwise, return 0. */ + +static int +dwarf2_get_pc_bounds (die, lowpc, highpc, objfile) + struct die_info *die; + CORE_ADDR *lowpc; + CORE_ADDR *highpc; + struct objfile *objfile; +{ + struct attribute *attr; + CORE_ADDR low; + CORE_ADDR high; + + attr = dwarf_attr (die, DW_AT_low_pc); + if (attr) + low = DW_ADDR (attr); + else + return 0; + attr = dwarf_attr (die, DW_AT_high_pc); + if (attr) + high = DW_ADDR (attr); + else + return 0; + + if (high < low) + return 0; + + /* When using the GNU linker, .gnu.linkonce. sections are used to + eliminate duplicate copies of functions and vtables and such. + The linker will arbitrarily choose one and discard the others. + The AT_*_pc values for such functions refer to local labels in + these sections. If the section from that file was discarded, the + labels are not in the output, so the relocs get a value of 0. + If this is a discarded function, mark the pc bounds as invalid, + so that GDB will ignore it. */ + if (low == 0 && (bfd_get_file_flags (objfile->obfd) & HAS_RELOC) == 0) + return 0; + + *lowpc = low; + *highpc = high; + return 1; +} + +/* Add an aggregate field to the field list. */ + +static void +dwarf2_add_field (fip, die, objfile) + struct field_info *fip; + struct die_info *die; + struct objfile *objfile; +{ + struct nextfield *new_field; + struct attribute *attr; + struct field *fp; + char *fieldname = ""; + + /* Allocate a new field list entry and link it in. */ + new_field = (struct nextfield *) xmalloc (sizeof (struct nextfield)); + make_cleanup (free, new_field); + memset (new_field, 0, sizeof (struct nextfield)); + new_field->next = fip->fields; + fip->fields = new_field; + fip->nfields++; + + /* Handle accessibility and virtuality of field. + The default accessibility for members is public, the default + accessibility for inheritance is private. */ + if (die->tag != DW_TAG_inheritance) + new_field->accessibility = DW_ACCESS_public; + else + new_field->accessibility = DW_ACCESS_private; + new_field->virtuality = DW_VIRTUALITY_none; + + attr = dwarf_attr (die, DW_AT_accessibility); + if (attr) + new_field->accessibility = DW_UNSND (attr); + if (new_field->accessibility != DW_ACCESS_public) + fip->non_public_fields = 1; + attr = dwarf_attr (die, DW_AT_virtuality); + if (attr) + new_field->virtuality = DW_UNSND (attr); + + fp = &new_field->field; + if (die->tag == DW_TAG_member) + { + /* Get type of field. */ + fp->type = die_type (die, objfile); + + /* Get bit size of field (zero if none). */ + attr = dwarf_attr (die, DW_AT_bit_size); + if (attr) + { + FIELD_BITSIZE (*fp) = DW_UNSND (attr); + } + else + { + FIELD_BITSIZE (*fp) = 0; + } + + /* Get bit offset of field. */ + attr = dwarf_attr (die, DW_AT_data_member_location); + if (attr) + { + FIELD_BITPOS (*fp) = + decode_locdesc (DW_BLOCK (attr), objfile) * bits_per_byte; + } + else + FIELD_BITPOS (*fp) = 0; + attr = dwarf_attr (die, DW_AT_bit_offset); + if (attr) + { + if (BITS_BIG_ENDIAN) + { + /* For big endian bits, the DW_AT_bit_offset gives the + additional bit offset from the MSB of the containing + anonymous object to the MSB of the field. We don't + have to do anything special since we don't need to + know the size of the anonymous object. */ + FIELD_BITPOS (*fp) += DW_UNSND (attr); + } + else + { + /* For little endian bits, compute the bit offset to the + MSB of the anonymous object, subtract off the number of + bits from the MSB of the field to the MSB of the + object, and then subtract off the number of bits of + the field itself. The result is the bit offset of + the LSB of the field. */ + int anonymous_size; + int bit_offset = DW_UNSND (attr); + + attr = dwarf_attr (die, DW_AT_byte_size); + if (attr) + { + /* The size of the anonymous object containing + the bit field is explicit, so use the + indicated size (in bytes). */ + anonymous_size = DW_UNSND (attr); + } + else + { + /* The size of the anonymous object containing + the bit field must be inferred from the type + attribute of the data member containing the + bit field. */ + anonymous_size = TYPE_LENGTH (fp->type); + } + FIELD_BITPOS (*fp) += anonymous_size * bits_per_byte + - bit_offset - FIELD_BITSIZE (*fp); + } + } + + /* Get name of field. */ + attr = dwarf_attr (die, DW_AT_name); + if (attr && DW_STRING (attr)) + fieldname = DW_STRING (attr); + fp->name = obsavestring (fieldname, strlen (fieldname), + &objfile->type_obstack); + + /* Change accessibility for artificial fields (e.g. virtual table + pointer or virtual base class pointer) to private. */ + if (dwarf_attr (die, DW_AT_artificial)) + { + new_field->accessibility = DW_ACCESS_private; + fip->non_public_fields = 1; + } + } + else if (die->tag == DW_TAG_variable) + { + char *physname; + char *cp; + + /* C++ static member. + Get physical name, extract field name from physical name. */ + physname = dwarf2_linkage_name (die); + if (physname == NULL) + return; + + cp = physname; + while (*cp && !is_cplus_marker (*cp)) + cp++; + if (*cp) + fieldname = cp + 1; + if (*fieldname == '\0') + { + complain (&dwarf2_bad_static_member_name, physname); + } + + SET_FIELD_PHYSNAME (*fp, obsavestring (physname, strlen (physname), + &objfile->type_obstack)); + FIELD_TYPE (*fp) = die_type (die, objfile); + FIELD_NAME (*fp) = obsavestring (fieldname, strlen (fieldname), + &objfile->type_obstack); + } + else if (die->tag == DW_TAG_inheritance) + { + /* C++ base class field. */ + attr = dwarf_attr (die, DW_AT_data_member_location); + if (attr) + FIELD_BITPOS (*fp) = decode_locdesc (DW_BLOCK (attr), objfile) * bits_per_byte; + FIELD_BITSIZE (*fp) = 0; + FIELD_TYPE (*fp) = die_type (die, objfile); + FIELD_NAME (*fp) = type_name_no_tag (fp->type); + fip->nbaseclasses++; + } +} + +/* Create the vector of fields, and attach it to the type. */ + +static void +dwarf2_attach_fields_to_type (fip, type, objfile) + struct field_info *fip; + struct type *type; + struct objfile *objfile; +{ + int nfields = fip->nfields; + + /* Record the field count, allocate space for the array of fields, + and create blank accessibility bitfields if necessary. */ + TYPE_NFIELDS (type) = nfields; + TYPE_FIELDS (type) = (struct field *) + TYPE_ALLOC (type, sizeof (struct field) * nfields); + memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields); + + if (fip->non_public_fields) + { + ALLOCATE_CPLUS_STRUCT_TYPE (type); + + TYPE_FIELD_PRIVATE_BITS (type) = + (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); + B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields); + + TYPE_FIELD_PROTECTED_BITS (type) = + (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); + B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields); + + TYPE_FIELD_IGNORE_BITS (type) = + (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); + B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields); + } + + /* If the type has baseclasses, allocate and clear a bit vector for + TYPE_FIELD_VIRTUAL_BITS. */ + if (fip->nbaseclasses) + { + int num_bytes = B_BYTES (fip->nbaseclasses); + char *pointer; + + ALLOCATE_CPLUS_STRUCT_TYPE (type); + pointer = (char *) TYPE_ALLOC (type, num_bytes); + TYPE_FIELD_VIRTUAL_BITS (type) = (B_TYPE *) pointer; + B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses); + TYPE_N_BASECLASSES (type) = fip->nbaseclasses; + } + + /* Copy the saved-up fields into the field vector. Start from the head + of the list, adding to the tail of the field array, so that they end + up in the same order in the array in which they were added to the list. */ + while (nfields-- > 0) + { + TYPE_FIELD (type, nfields) = fip->fields->field; + switch (fip->fields->accessibility) + { + case DW_ACCESS_private: + SET_TYPE_FIELD_PRIVATE (type, nfields); + break; + + case DW_ACCESS_protected: + SET_TYPE_FIELD_PROTECTED (type, nfields); + break; + + case DW_ACCESS_public: + break; + + default: + /* Unknown accessibility. Complain and treat it as public. */ + { + complain (&dwarf2_unsupported_accessibility, + fip->fields->accessibility); + } + break; + } + if (nfields < fip->nbaseclasses) + { + switch (fip->fields->virtuality) + { + case DW_VIRTUALITY_virtual: + case DW_VIRTUALITY_pure_virtual: + SET_TYPE_FIELD_VIRTUAL (type, nfields); + break; + } + } + fip->fields = fip->fields->next; + } +} + +/* Skip to the end of a member function name in a mangled name. */ + +static char * +skip_member_fn_name (physname) + char *physname; +{ + char *endname = physname; + + /* Skip over leading underscores. */ + while (*endname == '_') + endname++; + + /* Find two succesive underscores. */ + do + endname = strchr (endname, '_'); + while (endname != NULL && *++endname != '_'); + + if (endname == NULL) + { + complain (&dwarf2_bad_member_name_complaint, physname); + endname = physname; + } + else + { + /* Take care of trailing underscores. */ + if (endname[1] != '_') + endname--; + } + return endname; +} + +/* Add a member function to the proper fieldlist. */ + +static void +dwarf2_add_member_fn (fip, die, type, objfile) + struct field_info *fip; + struct die_info *die; + struct type *type; + struct objfile *objfile; +{ + struct attribute *attr; + struct fnfieldlist *flp; + int i; + struct fn_field *fnp; + char *fieldname; + char *physname; + struct nextfnfield *new_fnfield; + + /* Extract member function name from mangled name. */ + physname = dwarf2_linkage_name (die); + if (physname == NULL) + return; + if ((physname[0] == '_' && physname[1] == '_' + && strchr ("0123456789Qt", physname[2])) + || DESTRUCTOR_PREFIX_P (physname)) + { + /* Constructor and destructor field names are set to the name + of the class, but without template parameter lists. + The name might be missing for anonymous aggregates. */ + if (TYPE_TAG_NAME (type)) + { + char *p = strchr (TYPE_TAG_NAME (type), '<'); + + if (p == NULL) + fieldname = TYPE_TAG_NAME (type); + else + fieldname = obsavestring (TYPE_TAG_NAME (type), + p - TYPE_TAG_NAME (type), + &objfile->type_obstack); + } + else + { + char *anon_name = ""; + fieldname = obsavestring (anon_name, strlen (anon_name), + &objfile->type_obstack); + } + } + else + { + char *endname = skip_member_fn_name (physname); + + /* Ignore member function if we were unable not extract the member + function name. */ + if (endname == physname) + return; + fieldname = obsavestring (physname, endname - physname, + &objfile->type_obstack); + } + + /* Look up member function name in fieldlist. */ + for (i = 0; i < fip->nfnfields; i++) + { + if (STREQ (fip->fnfieldlists[i].name, fieldname)) + break; + } + + /* Create new list element if necessary. */ + if (i < fip->nfnfields) + flp = &fip->fnfieldlists[i]; + else + { + if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0) + { + fip->fnfieldlists = (struct fnfieldlist *) + xrealloc (fip->fnfieldlists, + (fip->nfnfields + DW_FIELD_ALLOC_CHUNK) + * sizeof (struct fnfieldlist)); + if (fip->nfnfields == 0) + make_cleanup ((make_cleanup_func) free_current_contents, + &fip->fnfieldlists); + } + flp = &fip->fnfieldlists[fip->nfnfields]; + flp->name = fieldname; + flp->length = 0; + flp->head = NULL; + fip->nfnfields++; + } + + /* Create a new member function field and chain it to the field list + entry. */ + new_fnfield = (struct nextfnfield *) xmalloc (sizeof (struct nextfnfield)); + make_cleanup (free, new_fnfield); + memset (new_fnfield, 0, sizeof (struct nextfnfield)); + new_fnfield->next = flp->head; + flp->head = new_fnfield; + flp->length++; + + /* Fill in the member function field info. */ + fnp = &new_fnfield->fnfield; + fnp->physname = obsavestring (physname, strlen (physname), + &objfile->type_obstack); + fnp->type = alloc_type (objfile); + if (die->type && TYPE_CODE (die->type) == TYPE_CODE_FUNC) + { + struct type *return_type = TYPE_TARGET_TYPE (die->type); + struct type **arg_types; + int nparams = TYPE_NFIELDS (die->type); + int iparams; + + /* Copy argument types from the subroutine type. */ + arg_types = (struct type **) + TYPE_ALLOC (fnp->type, (nparams + 1) * sizeof (struct type *)); + for (iparams = 0; iparams < nparams; iparams++) + arg_types[iparams] = TYPE_FIELD_TYPE (die->type, iparams); + + /* Set last entry in argument type vector. */ + if (TYPE_FLAGS (die->type) & TYPE_FLAG_VARARGS) + arg_types[nparams] = NULL; + else + arg_types[nparams] = dwarf2_fundamental_type (objfile, FT_VOID); + + smash_to_method_type (fnp->type, type, return_type, arg_types); + + /* Handle static member functions. + Dwarf2 has no clean way to discern C++ static and non-static + member functions. G++ helps GDB by marking the first + parameter for non-static member functions (which is the + this pointer) as artificial. We obtain this information + from read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */ + if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (die->type, 0) == 0) + fnp->voffset = VOFFSET_STATIC; + } + else + complain (&dwarf2_missing_member_fn_type_complaint, physname); + + /* Get fcontext from DW_AT_containing_type if present. */ + if (dwarf_attr (die, DW_AT_containing_type) != NULL) + fnp->fcontext = die_containing_type (die, objfile); + + /* dwarf2 doesn't have stubbed physical names, so the setting of is_const + and is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */ + + /* Get accessibility. */ + attr = dwarf_attr (die, DW_AT_accessibility); + if (attr) + { + switch (DW_UNSND (attr)) + { + case DW_ACCESS_private: + fnp->is_private = 1; + break; + case DW_ACCESS_protected: + fnp->is_protected = 1; + break; + } + } + + /* Get index in virtual function table if it is a virtual member function. */ + attr = dwarf_attr (die, DW_AT_vtable_elem_location); + if (attr) + fnp->voffset = decode_locdesc (DW_BLOCK (attr), objfile) + 2; +} + +/* Create the vector of member function fields, and attach it to the type. */ + +static void +dwarf2_attach_fn_fields_to_type (fip, type, objfile) + struct field_info *fip; + struct type *type; + struct objfile *objfile; +{ + struct fnfieldlist *flp; + int total_length = 0; + int i; + + ALLOCATE_CPLUS_STRUCT_TYPE (type); + TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *) + TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields); + + for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++) + { + struct nextfnfield *nfp = flp->head; + struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i); + int k; + + TYPE_FN_FIELDLIST_NAME (type, i) = flp->name; + TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length; + fn_flp->fn_fields = (struct fn_field *) + TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length); + for (k = flp->length; (k--, nfp); nfp = nfp->next) + fn_flp->fn_fields[k] = nfp->fnfield; + + total_length += flp->length; + } + + TYPE_NFN_FIELDS (type) = fip->nfnfields; + TYPE_NFN_FIELDS_TOTAL (type) = total_length; +} + +/* Called when we find the DIE that starts a structure or union scope + (definition) to process all dies that define the members of the + structure or union. + + NOTE: we need to call struct_type regardless of whether or not the + DIE has an at_name attribute, since it might be an anonymous + structure or union. This gets the type entered into our set of + user defined types. + + However, if the structure is incomplete (an opaque struct/union) + then suppress creating a symbol table entry for it since gdb only + wants to find the one with the complete definition. Note that if + it is complete, we just call new_symbol, which does it's own + checking about whether the struct/union is anonymous or not (and + suppresses creating a symbol table entry itself). */ + +static void +read_structure_scope (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + struct type *type; + struct attribute *attr; + + type = alloc_type (objfile); + + INIT_CPLUS_SPECIFIC (type); + attr = dwarf_attr (die, DW_AT_name); + if (attr && DW_STRING (attr)) + { + TYPE_TAG_NAME (type) = obsavestring (DW_STRING (attr), + strlen (DW_STRING (attr)), + &objfile->type_obstack); + } + + if (die->tag == DW_TAG_structure_type) + { + TYPE_CODE (type) = TYPE_CODE_STRUCT; + } + else if (die->tag == DW_TAG_union_type) + { + TYPE_CODE (type) = TYPE_CODE_UNION; + } + else + { + /* FIXME: TYPE_CODE_CLASS is currently defined to TYPE_CODE_STRUCT + in gdbtypes.h. */ + TYPE_CODE (type) = TYPE_CODE_CLASS; + } + + attr = dwarf_attr (die, DW_AT_byte_size); + if (attr) + { + TYPE_LENGTH (type) = DW_UNSND (attr); + } + else + { + TYPE_LENGTH (type) = 0; + } + + /* We need to add the type field to the die immediately so we don't + infinitely recurse when dealing with pointers to the structure + type within the structure itself. */ + die->type = type; + + if (die->has_children) + { + struct field_info fi; + struct die_info *child_die; + struct cleanup *back_to = make_cleanup (null_cleanup, NULL); + + memset (&fi, 0, sizeof (struct field_info)); + + child_die = die->next; + + while (child_die && child_die->tag) + { + if (child_die->tag == DW_TAG_member) + { + dwarf2_add_field (&fi, child_die, objfile); + } + else if (child_die->tag == DW_TAG_variable) + { + /* C++ static member. */ + dwarf2_add_field (&fi, child_die, objfile); + } + else if (child_die->tag == DW_TAG_subprogram) + { + /* C++ member function. */ + process_die (child_die, objfile); + dwarf2_add_member_fn (&fi, child_die, type, objfile); + } + else if (child_die->tag == DW_TAG_inheritance) + { + /* C++ base class field. */ + dwarf2_add_field (&fi, child_die, objfile); + } + else + { + process_die (child_die, objfile); + } + child_die = sibling_die (child_die); + } + + /* Attach fields and member functions to the type. */ + if (fi.nfields) + dwarf2_attach_fields_to_type (&fi, type, objfile); + if (fi.nfnfields) + { + dwarf2_attach_fn_fields_to_type (&fi, type, objfile); + + /* Get the type which refers to the base class (possibly this + class itself) which contains the vtable pointer for the current + class from the DW_AT_containing_type attribute. */ + + if (dwarf_attr (die, DW_AT_containing_type) != NULL) + { + struct type *t = die_containing_type (die, objfile); + + TYPE_VPTR_BASETYPE (type) = t; + if (type == t) + { + static const char vptr_name[] = { '_','v','p','t','r','\0' }; + int i; + + /* Our own class provides vtbl ptr. */ + for (i = TYPE_NFIELDS (t) - 1; + i >= TYPE_N_BASECLASSES (t); + --i) + { + char *fieldname = TYPE_FIELD_NAME (t, i); + + if (STREQN (fieldname, vptr_name, strlen (vptr_name) - 1) + && is_cplus_marker (fieldname[strlen (vptr_name)])) + { + TYPE_VPTR_FIELDNO (type) = i; + break; + } + } + + /* Complain if virtual function table field not found. */ + if (i < TYPE_N_BASECLASSES (t)) + complain (&dwarf2_vtbl_not_found_complaint, + TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) : ""); + } + else + { + TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t); + } + } + } + + new_symbol (die, type, objfile); + + do_cleanups (back_to); + } + else + { + /* No children, must be stub. */ + TYPE_FLAGS (type) |= TYPE_FLAG_STUB; + } + + die->type = type; +} + +/* Given a pointer to a die which begins an enumeration, process all + the dies that define the members of the enumeration. + + This will be much nicer in draft 6 of the DWARF spec when our + members will be dies instead squished into the DW_AT_element_list + attribute. + + NOTE: We reverse the order of the element list. */ + +static void +read_enumeration (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + struct die_info *child_die; + struct type *type; + struct field *fields; + struct attribute *attr; + struct symbol *sym; + int num_fields; + int unsigned_enum = 1; + + type = alloc_type (objfile); + + TYPE_CODE (type) = TYPE_CODE_ENUM; + attr = dwarf_attr (die, DW_AT_name); + if (attr && DW_STRING (attr)) + { + TYPE_TAG_NAME (type) = obsavestring (DW_STRING (attr), + strlen (DW_STRING (attr)), + &objfile->type_obstack); + } + + attr = dwarf_attr (die, DW_AT_byte_size); + if (attr) + { + TYPE_LENGTH (type) = DW_UNSND (attr); + } + else + { + TYPE_LENGTH (type) = 0; + } + + num_fields = 0; + fields = NULL; + if (die->has_children) + { + child_die = die->next; + while (child_die && child_die->tag) + { + if (child_die->tag != DW_TAG_enumerator) + { + process_die (child_die, objfile); + } + else + { + attr = dwarf_attr (child_die, DW_AT_name); + if (attr) + { + sym = new_symbol (child_die, type, objfile); + if (SYMBOL_VALUE (sym) < 0) + unsigned_enum = 0; + + if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0) + { + fields = (struct field *) + xrealloc (fields, + (num_fields + DW_FIELD_ALLOC_CHUNK) + * sizeof (struct field)); + } + + FIELD_NAME (fields[num_fields]) = SYMBOL_NAME (sym); + FIELD_TYPE (fields[num_fields]) = NULL; + FIELD_BITPOS (fields[num_fields]) = SYMBOL_VALUE (sym); + FIELD_BITSIZE (fields[num_fields]) = 0; + + num_fields++; + } + } + + child_die = sibling_die (child_die); + } + + if (num_fields) + { + TYPE_NFIELDS (type) = num_fields; + TYPE_FIELDS (type) = (struct field *) + TYPE_ALLOC (type, sizeof (struct field) * num_fields); + memcpy (TYPE_FIELDS (type), fields, + sizeof (struct field) * num_fields); + free (fields); + } + if (unsigned_enum) + TYPE_FLAGS (type) |= TYPE_FLAG_UNSIGNED; + } + die->type = type; + new_symbol (die, type, objfile); +} + +/* Extract all information from a DW_TAG_array_type DIE and put it in + the DIE's type field. For now, this only handles one dimensional + arrays. */ + +static void +read_array_type (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + struct die_info *child_die; + struct type *type = NULL; + struct type *element_type, *range_type, *index_type; + struct type **range_types = NULL; + struct attribute *attr; + int ndim = 0; + struct cleanup *back_to; + + /* Return if we've already decoded this type. */ + if (die->type) + { + return; + } + + element_type = die_type (die, objfile); + + /* Irix 6.2 native cc creates array types without children for + arrays with unspecified length. */ + if (die->has_children == 0) + { + index_type = dwarf2_fundamental_type (objfile, FT_INTEGER); + range_type = create_range_type (NULL, index_type, 0, -1); + die->type = create_array_type (NULL, element_type, range_type); + return; + } + + back_to = make_cleanup (null_cleanup, NULL); + child_die = die->next; + while (child_die && child_die->tag) + { + if (child_die->tag == DW_TAG_subrange_type) + { + unsigned int low, high; + + /* Default bounds to an array with unspecified length. */ + low = 0; + high = -1; + if (cu_language == language_fortran) + { + /* FORTRAN implies a lower bound of 1, if not given. */ + low = 1; + } + + index_type = die_type (child_die, objfile); + attr = dwarf_attr (child_die, DW_AT_lower_bound); + if (attr) + { + if (attr->form == DW_FORM_sdata) + { + low = DW_SND (attr); + } + else if (attr->form == DW_FORM_udata + || attr->form == DW_FORM_data1 + || attr->form == DW_FORM_data2 + || attr->form == DW_FORM_data4) + { + low = DW_UNSND (attr); + } + else + { + complain (&dwarf2_non_const_array_bound_ignored, + dwarf_form_name (attr->form)); +#ifdef FORTRAN_HACK + die->type = lookup_pointer_type (element_type); + return; +#else + low = 0; +#endif + } + } + attr = dwarf_attr (child_die, DW_AT_upper_bound); + if (attr) + { + if (attr->form == DW_FORM_sdata) + { + high = DW_SND (attr); + } + else if (attr->form == DW_FORM_udata + || attr->form == DW_FORM_data1 + || attr->form == DW_FORM_data2 + || attr->form == DW_FORM_data4) + { + high = DW_UNSND (attr); + } + else if (attr->form == DW_FORM_block1) + { + /* GCC encodes arrays with unspecified or dynamic length + with a DW_FORM_block1 attribute. + FIXME: GDB does not yet know how to handle dynamic + arrays properly, treat them as arrays with unspecified + length for now. */ + high = -1; + } + else + { + complain (&dwarf2_non_const_array_bound_ignored, + dwarf_form_name (attr->form)); +#ifdef FORTRAN_HACK + die->type = lookup_pointer_type (element_type); + return; +#else + high = 1; +#endif + } + } + + /* Create a range type and save it for array type creation. */ + if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0) + { + range_types = (struct type **) + xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK) + * sizeof (struct type *)); + if (ndim == 0) + make_cleanup ((make_cleanup_func) free_current_contents, + &range_types); + } + range_types[ndim++] = create_range_type (NULL, index_type, low, high); + } + child_die = sibling_die (child_die); + } + + /* Dwarf2 dimensions are output from left to right, create the + necessary array types in backwards order. */ + type = element_type; + while (ndim-- > 0) + type = create_array_type (NULL, type, range_types[ndim]); + + do_cleanups (back_to); + + /* Install the type in the die. */ + die->type = type; +} + +/* First cut: install each common block member as a global variable. */ + +static void +read_common_block (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + struct die_info *child_die; + struct attribute *attr; + struct symbol *sym; + CORE_ADDR base = (CORE_ADDR) 0; + + attr = dwarf_attr (die, DW_AT_location); + if (attr) + { + base = decode_locdesc (DW_BLOCK (attr), objfile); + } + if (die->has_children) + { + child_die = die->next; + while (child_die && child_die->tag) + { + sym = new_symbol (child_die, NULL, objfile); + attr = dwarf_attr (child_die, DW_AT_data_member_location); + if (attr) + { + SYMBOL_VALUE_ADDRESS (sym) = + base + decode_locdesc (DW_BLOCK (attr), objfile); + add_symbol_to_list (sym, &global_symbols); + } + child_die = sibling_die (child_die); + } + } +} + +/* Extract all information from a DW_TAG_pointer_type DIE and add to + the user defined type vector. */ + +static void +read_tag_pointer_type (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + struct type *type; + struct attribute *attr; + + if (die->type) + { + return; + } + + type = lookup_pointer_type (die_type (die, objfile)); + attr = dwarf_attr (die, DW_AT_byte_size); + if (attr) + { + TYPE_LENGTH (type) = DW_UNSND (attr); + } + else + { + TYPE_LENGTH (type) = address_size; + } + die->type = type; +} + +/* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to + the user defined type vector. */ + +static void +read_tag_ptr_to_member_type (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + struct type *type; + struct type *to_type; + struct type *domain; + + if (die->type) + { + return; + } + + type = alloc_type (objfile); + to_type = die_type (die, objfile); + domain = die_containing_type (die, objfile); + smash_to_member_type (type, domain, to_type); + + die->type = type; +} + +/* Extract all information from a DW_TAG_reference_type DIE and add to + the user defined type vector. */ + +static void +read_tag_reference_type (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + struct type *type; + struct attribute *attr; + + if (die->type) + { + return; + } + + type = lookup_reference_type (die_type (die, objfile)); + attr = dwarf_attr (die, DW_AT_byte_size); + if (attr) + { + TYPE_LENGTH (type) = DW_UNSND (attr); + } + else + { + TYPE_LENGTH (type) = address_size; + } + die->type = type; +} + +static void +read_tag_const_type (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + if (die->type) + { + return; + } + + complain (&dwarf2_const_ignored); + die->type = die_type (die, objfile); +} + +static void +read_tag_volatile_type (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + if (die->type) + { + return; + } + + complain (&dwarf2_volatile_ignored); + die->type = die_type (die, objfile); +} + +/* Extract all information from a DW_TAG_string_type DIE and add to + the user defined type vector. It isn't really a user defined type, + but it behaves like one, with other DIE's using an AT_user_def_type + attribute to reference it. */ + +static void +read_tag_string_type (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + struct type *type, *range_type, *index_type, *char_type; + struct attribute *attr; + unsigned int length; + + if (die->type) + { + return; + } + + attr = dwarf_attr (die, DW_AT_string_length); + if (attr) + { + length = DW_UNSND (attr); + } + else + { + length = 1; + } + index_type = dwarf2_fundamental_type (objfile, FT_INTEGER); + range_type = create_range_type (NULL, index_type, 1, length); + char_type = dwarf2_fundamental_type (objfile, FT_CHAR); + type = create_string_type (char_type, range_type); + die->type = type; +} + +/* Handle DIES due to C code like: + + struct foo + { + int (*funcp)(int a, long l); + int b; + }; + + ('funcp' generates a DW_TAG_subroutine_type DIE) +*/ + +static void +read_subroutine_type (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + struct type *type; /* Type that this function returns */ + struct type *ftype; /* Function that returns above type */ + struct attribute *attr; + + /* Decode the type that this subroutine returns */ + if (die->type) + { + return; + } + type = die_type (die, objfile); + ftype = lookup_function_type (type); + + /* All functions in C++ have prototypes. */ + attr = dwarf_attr (die, DW_AT_prototyped); + if ((attr && (DW_UNSND (attr) != 0)) + || cu_language == language_cplus) + TYPE_FLAGS (ftype) |= TYPE_FLAG_PROTOTYPED; + + if (die->has_children) + { + struct die_info *child_die; + int nparams = 0; + int iparams = 0; + + /* Count the number of parameters. + FIXME: GDB currently ignores vararg functions, but knows about + vararg member functions. */ + child_die = die->next; + while (child_die && child_die->tag) + { + if (child_die->tag == DW_TAG_formal_parameter) + nparams++; + else if (child_die->tag == DW_TAG_unspecified_parameters) + TYPE_FLAGS (ftype) |= TYPE_FLAG_VARARGS; + child_die = sibling_die (child_die); + } + + /* Allocate storage for parameters and fill them in. */ + TYPE_NFIELDS (ftype) = nparams; + TYPE_FIELDS (ftype) = (struct field *) + TYPE_ALLOC (ftype, nparams * sizeof (struct field)); + + child_die = die->next; + while (child_die && child_die->tag) + { + if (child_die->tag == DW_TAG_formal_parameter) + { + /* Dwarf2 has no clean way to discern C++ static and non-static + member functions. G++ helps GDB by marking the first + parameter for non-static member functions (which is the + this pointer) as artificial. We pass this information + to dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL. */ + attr = dwarf_attr (child_die, DW_AT_artificial); + if (attr) + TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr); + else + TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0; + TYPE_FIELD_TYPE (ftype, iparams) = die_type (child_die, objfile); + iparams++; + } + child_die = sibling_die (child_die); + } + } + + die->type = ftype; +} + +static void +read_typedef (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + struct type *type; + + if (!die->type) + { + struct attribute *attr; + struct type *xtype; + + xtype = die_type (die, objfile); + + type = alloc_type (objfile); + TYPE_CODE (type) = TYPE_CODE_TYPEDEF; + TYPE_FLAGS (type) |= TYPE_FLAG_TARGET_STUB; + TYPE_TARGET_TYPE (type) = xtype; + attr = dwarf_attr (die, DW_AT_name); + if (attr && DW_STRING (attr)) + TYPE_NAME (type) = obsavestring (DW_STRING (attr), + strlen (DW_STRING (attr)), + &objfile->type_obstack); + + die->type = type; + } +} + +/* Find a representation of a given base type and install + it in the TYPE field of the die. */ + +static void +read_base_type (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + struct type *type; + struct attribute *attr; + int encoding = 0, size = 0; + + /* If we've already decoded this die, this is a no-op. */ + if (die->type) + { + return; + } + + attr = dwarf_attr (die, DW_AT_encoding); + if (attr) + { + encoding = DW_UNSND (attr); + } + attr = dwarf_attr (die, DW_AT_byte_size); + if (attr) + { + size = DW_UNSND (attr); + } + attr = dwarf_attr (die, DW_AT_name); + if (attr && DW_STRING (attr)) + { + enum type_code code = TYPE_CODE_INT; + int is_unsigned = 0; + + switch (encoding) + { + case DW_ATE_address: + /* Turn DW_ATE_address into a void * pointer. */ + code = TYPE_CODE_PTR; + is_unsigned = 1; + break; + case DW_ATE_boolean: + code = TYPE_CODE_BOOL; + is_unsigned = 1; + break; + case DW_ATE_complex_float: + code = TYPE_CODE_COMPLEX; + break; + case DW_ATE_float: + code = TYPE_CODE_FLT; + break; + case DW_ATE_signed: + case DW_ATE_signed_char: + break; + case DW_ATE_unsigned: + case DW_ATE_unsigned_char: + is_unsigned = 1; + break; + default: + complain (&dwarf2_unsupported_at_encoding, + dwarf_type_encoding_name (encoding)); + break; + } + type = init_type (code, size, is_unsigned, DW_STRING (attr), objfile); + if (encoding == DW_ATE_address) + TYPE_TARGET_TYPE (type) = dwarf2_fundamental_type (objfile, FT_VOID); + } + else + { + type = dwarf_base_type (encoding, size, objfile); + } + die->type = type; +} + +/* Read a whole compilation unit into a linked list of dies. */ + +struct die_info * +read_comp_unit (info_ptr, abfd) + char *info_ptr; + bfd *abfd; +{ + struct die_info *first_die, *last_die, *die; + char *cur_ptr; + int nesting_level; + + /* Reset die reference table, we are building a new one now. */ + dwarf2_empty_die_ref_table (); + + cur_ptr = info_ptr; + nesting_level = 0; + first_die = last_die = NULL; + do + { + cur_ptr = read_full_die (&die, abfd, cur_ptr); + if (die->has_children) + { + nesting_level++; + } + if (die->tag == 0) + { + nesting_level--; + } + + die->next = NULL; + + /* Enter die in reference hash table */ + store_in_ref_table (die->offset, die); + + if (!first_die) + { + first_die = last_die = die; + } + else + { + last_die->next = die; + last_die = die; + } + } + while (nesting_level > 0); + return first_die; +} + +/* Free a linked list of dies. */ + +static void +free_die_list (dies) + struct die_info *dies; +{ + struct die_info *die, *next; + + die = dies; + while (die) + { + next = die->next; + free (die->attrs); + free (die); + die = next; + } +} + +/* Read the contents of the section at OFFSET and of size SIZE from the + object file specified by OBJFILE into the psymbol_obstack and return it. */ + +static char * +dwarf2_read_section (objfile, offset, size) + struct objfile *objfile; + file_ptr offset; + unsigned int size; +{ + bfd *abfd = objfile->obfd; + char *buf; + + if (size == 0) + return NULL; + + buf = (char *) obstack_alloc (&objfile->psymbol_obstack, size); + if ((bfd_seek (abfd, offset, SEEK_SET) != 0) || + (bfd_read (buf, size, 1, abfd) != size)) + { + buf = NULL; + error ("Dwarf Error: Can't read DWARF data from '%s'", + bfd_get_filename (abfd)); + } + return buf; +} + +/* In DWARF version 2, the description of the debugging information is + stored in a separate .debug_abbrev section. Before we read any + dies from a section we read in all abbreviations and install them + in a hash table. */ + +static void +dwarf2_read_abbrevs (abfd, offset) + bfd * abfd; + unsigned int offset; +{ + char *abbrev_ptr; + struct abbrev_info *cur_abbrev; + unsigned int abbrev_number, bytes_read, abbrev_name; + unsigned int abbrev_form, hash_number; + + /* empty the table */ + dwarf2_empty_abbrev_table (NULL); + + abbrev_ptr = dwarf_abbrev_buffer + offset; + abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); + abbrev_ptr += bytes_read; + + /* loop until we reach an abbrev number of 0 */ + while (abbrev_number) + { + cur_abbrev = dwarf_alloc_abbrev (); + + /* read in abbrev header */ + cur_abbrev->number = abbrev_number; + cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); + abbrev_ptr += bytes_read; + cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr); + abbrev_ptr += 1; + + /* now read in declarations */ + abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); + abbrev_ptr += bytes_read; + abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); + abbrev_ptr += bytes_read; + while (abbrev_name) + { + if ((cur_abbrev->num_attrs % ATTR_ALLOC_CHUNK) == 0) + { + cur_abbrev->attrs = (struct attr_abbrev *) + xrealloc (cur_abbrev->attrs, + (cur_abbrev->num_attrs + ATTR_ALLOC_CHUNK) + * sizeof (struct attr_abbrev)); + } + cur_abbrev->attrs[cur_abbrev->num_attrs].name = abbrev_name; + cur_abbrev->attrs[cur_abbrev->num_attrs++].form = abbrev_form; + abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); + abbrev_ptr += bytes_read; + abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); + abbrev_ptr += bytes_read; + } + + hash_number = abbrev_number % ABBREV_HASH_SIZE; + cur_abbrev->next = dwarf2_abbrevs[hash_number]; + dwarf2_abbrevs[hash_number] = cur_abbrev; + + /* Get next abbreviation. + Under Irix6 the abbreviations for a compilation unit are not + always properly terminated with an abbrev number of 0. + Exit loop if we encounter an abbreviation which we have + already read (which means we are about to read the abbreviations + for the next compile unit) or if the end of the abbreviation + table is reached. */ + if ((unsigned int) (abbrev_ptr - dwarf_abbrev_buffer) + >= dwarf_abbrev_size) + break; + abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); + abbrev_ptr += bytes_read; + if (dwarf2_lookup_abbrev (abbrev_number) != NULL) + break; + } +} + +/* Empty the abbrev table for a new compilation unit. */ + +/* ARGSUSED */ +static void +dwarf2_empty_abbrev_table (ignore) + PTR ignore; +{ + int i; + struct abbrev_info *abbrev, *next; + + for (i = 0; i < ABBREV_HASH_SIZE; ++i) + { + next = NULL; + abbrev = dwarf2_abbrevs[i]; + while (abbrev) + { + next = abbrev->next; + free (abbrev->attrs); + free (abbrev); + abbrev = next; + } + dwarf2_abbrevs[i] = NULL; + } +} + +/* Lookup an abbrev_info structure in the abbrev hash table. */ + +static struct abbrev_info * +dwarf2_lookup_abbrev (number) + unsigned int number; +{ + unsigned int hash_number; + struct abbrev_info *abbrev; + + hash_number = number % ABBREV_HASH_SIZE; + abbrev = dwarf2_abbrevs[hash_number]; + + while (abbrev) + { + if (abbrev->number == number) + return abbrev; + else + abbrev = abbrev->next; + } + return NULL; +} + +/* Read a minimal amount of information into the minimal die structure. */ + +static char * +read_partial_die (part_die, abfd, info_ptr, has_pc_info) + struct partial_die_info *part_die; + bfd * abfd; + char *info_ptr; + int *has_pc_info; +{ + unsigned int abbrev_number, bytes_read, i; + struct abbrev_info *abbrev; + struct attribute attr; + struct attribute spec_attr; + int found_spec_attr = 0; + int has_low_pc_attr = 0; + int has_high_pc_attr = 0; + + *part_die = zeroed_partial_die; + *has_pc_info = 0; + abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); + info_ptr += bytes_read; + if (!abbrev_number) + return info_ptr; + + abbrev = dwarf2_lookup_abbrev (abbrev_number); + if (!abbrev) + { + error ("Dwarf Error: Could not find abbrev number %d.", abbrev_number); + } + part_die->offset = info_ptr - dwarf_info_buffer; + part_die->tag = abbrev->tag; + part_die->has_children = abbrev->has_children; + part_die->abbrev = abbrev_number; + + for (i = 0; i < abbrev->num_attrs; ++i) + { + info_ptr = read_attribute (&attr, &abbrev->attrs[i], abfd, info_ptr); + + /* Store the data if it is of an attribute we want to keep in a + partial symbol table. */ + switch (attr.name) + { + case DW_AT_name: + + /* Prefer DW_AT_MIPS_linkage_name over DW_AT_name. */ + if (part_die->name == NULL) + part_die->name = DW_STRING (&attr); + break; + case DW_AT_MIPS_linkage_name: + part_die->name = DW_STRING (&attr); + break; + case DW_AT_low_pc: + has_low_pc_attr = 1; + part_die->lowpc = DW_ADDR (&attr); + break; + case DW_AT_high_pc: + has_high_pc_attr = 1; + part_die->highpc = DW_ADDR (&attr); + break; + case DW_AT_location: + part_die->locdesc = DW_BLOCK (&attr); + break; + case DW_AT_language: + part_die->language = DW_UNSND (&attr); + break; + case DW_AT_external: + part_die->is_external = DW_UNSND (&attr); + break; + case DW_AT_declaration: + part_die->is_declaration = DW_UNSND (&attr); + break; + case DW_AT_type: + part_die->has_type = 1; + break; + case DW_AT_abstract_origin: + case DW_AT_specification: + found_spec_attr = 1; + spec_attr = attr; + break; + case DW_AT_sibling: + /* Ignore absolute siblings, they might point outside of + the current compile unit. */ + if (attr.form == DW_FORM_ref_addr) + complain(&dwarf2_absolute_sibling_complaint); + else + part_die->sibling = + dwarf_info_buffer + dwarf2_get_ref_die_offset (&attr); + break; + default: + break; + } + } + + /* If we found a reference attribute and the die has no name, try + to find a name in the referred to die. */ + + if (found_spec_attr && part_die->name == NULL) + { + struct partial_die_info spec_die; + char *spec_ptr; + int dummy; + + spec_ptr = dwarf_info_buffer + dwarf2_get_ref_die_offset (&spec_attr); + read_partial_die (&spec_die, abfd, spec_ptr, &dummy); + if (spec_die.name) + { + part_die->name = spec_die.name; + + /* Copy DW_AT_external attribute if it is set. */ + if (spec_die.is_external) + part_die->is_external = spec_die.is_external; + } + } + + /* When using the GNU linker, .gnu.linkonce. sections are used to + eliminate duplicate copies of functions and vtables and such. + The linker will arbitrarily choose one and discard the others. + The AT_*_pc values for such functions refer to local labels in + these sections. If the section from that file was discarded, the + labels are not in the output, so the relocs get a value of 0. + If this is a discarded function, mark the pc bounds as invalid, + so that GDB will ignore it. */ + if (has_low_pc_attr && has_high_pc_attr + && part_die->lowpc < part_die->highpc + && (part_die->lowpc != 0 + || (bfd_get_file_flags (abfd) & HAS_RELOC))) + *has_pc_info = 1; + return info_ptr; +} + +/* Read the die from the .debug_info section buffer. And set diep to + point to a newly allocated die with its information. */ + +static char * +read_full_die (diep, abfd, info_ptr) + struct die_info **diep; + bfd *abfd; + char *info_ptr; +{ + unsigned int abbrev_number, bytes_read, i, offset; + struct abbrev_info *abbrev; + struct die_info *die; + + offset = info_ptr - dwarf_info_buffer; + abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); + info_ptr += bytes_read; + if (!abbrev_number) + { + die = dwarf_alloc_die (); + die->tag = 0; + die->abbrev = abbrev_number; + die->type = NULL; + *diep = die; + return info_ptr; + } + + abbrev = dwarf2_lookup_abbrev (abbrev_number); + if (!abbrev) + { + error ("Dwarf Error: could not find abbrev number %d.", abbrev_number); + } + die = dwarf_alloc_die (); + die->offset = offset; + die->tag = abbrev->tag; + die->has_children = abbrev->has_children; + die->abbrev = abbrev_number; + die->type = NULL; + + die->num_attrs = abbrev->num_attrs; + die->attrs = (struct attribute *) + xmalloc (die->num_attrs * sizeof (struct attribute)); + + for (i = 0; i < abbrev->num_attrs; ++i) + { + info_ptr = read_attribute (&die->attrs[i], &abbrev->attrs[i], + abfd, info_ptr); + } + + *diep = die; + return info_ptr; +} + +/* Read an attribute described by an abbreviated attribute. */ + +static char * +read_attribute (attr, abbrev, abfd, info_ptr) + struct attribute *attr; + struct attr_abbrev *abbrev; + bfd *abfd; + char *info_ptr; +{ + unsigned int bytes_read; + struct dwarf_block *blk; + + attr->name = abbrev->name; + attr->form = abbrev->form; + switch (abbrev->form) + { + case DW_FORM_addr: + case DW_FORM_ref_addr: + DW_ADDR (attr) = read_address (abfd, info_ptr); + info_ptr += address_size; + break; + case DW_FORM_block2: + blk = dwarf_alloc_block (); + blk->size = read_2_bytes (abfd, info_ptr); + info_ptr += 2; + blk->data = read_n_bytes (abfd, info_ptr, blk->size); + info_ptr += blk->size; + DW_BLOCK (attr) = blk; + break; + case DW_FORM_block4: + blk = dwarf_alloc_block (); + blk->size = read_4_bytes (abfd, info_ptr); + info_ptr += 4; + blk->data = read_n_bytes (abfd, info_ptr, blk->size); + info_ptr += blk->size; + DW_BLOCK (attr) = blk; + break; + case DW_FORM_data2: + DW_UNSND (attr) = read_2_bytes (abfd, info_ptr); + info_ptr += 2; + break; + case DW_FORM_data4: + DW_UNSND (attr) = read_4_bytes (abfd, info_ptr); + info_ptr += 4; + break; + case DW_FORM_data8: + DW_UNSND (attr) = read_8_bytes (abfd, info_ptr); + info_ptr += 8; + break; + case DW_FORM_string: + DW_STRING (attr) = read_string (abfd, info_ptr, &bytes_read); + info_ptr += bytes_read; + break; + case DW_FORM_block: + blk = dwarf_alloc_block (); + blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); + info_ptr += bytes_read; + blk->data = read_n_bytes (abfd, info_ptr, blk->size); + info_ptr += blk->size; + DW_BLOCK (attr) = blk; + break; + case DW_FORM_block1: + blk = dwarf_alloc_block (); + blk->size = read_1_byte (abfd, info_ptr); + info_ptr += 1; + blk->data = read_n_bytes (abfd, info_ptr, blk->size); + info_ptr += blk->size; + DW_BLOCK (attr) = blk; + break; + case DW_FORM_data1: + DW_UNSND (attr) = read_1_byte (abfd, info_ptr); + info_ptr += 1; + break; + case DW_FORM_flag: + DW_UNSND (attr) = read_1_byte (abfd, info_ptr); + info_ptr += 1; + break; + case DW_FORM_sdata: + DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read); + info_ptr += bytes_read; + break; + case DW_FORM_udata: + DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); + info_ptr += bytes_read; + break; + case DW_FORM_ref1: + DW_UNSND (attr) = read_1_byte (abfd, info_ptr); + info_ptr += 1; + break; + case DW_FORM_ref2: + DW_UNSND (attr) = read_2_bytes (abfd, info_ptr); + info_ptr += 2; + break; + case DW_FORM_ref4: + DW_UNSND (attr) = read_4_bytes (abfd, info_ptr); + info_ptr += 4; + break; + case DW_FORM_ref_udata: + DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); + info_ptr += bytes_read; + break; + case DW_FORM_strp: + case DW_FORM_indirect: + default: + error ("Dwarf Error: Cannot handle %s in DWARF reader.", + dwarf_form_name (abbrev->form)); + } + return info_ptr; +} + +/* read dwarf information from a buffer */ + +static unsigned int +read_1_byte (abfd, buf) + bfd *abfd; + char *buf; +{ + return bfd_get_8 (abfd, (bfd_byte *) buf); +} + +static int +read_1_signed_byte (abfd, buf) + bfd *abfd; + char *buf; +{ + return bfd_get_signed_8 (abfd, (bfd_byte *) buf); +} + +static unsigned int +read_2_bytes (abfd, buf) + bfd *abfd; + char *buf; +{ + return bfd_get_16 (abfd, (bfd_byte *) buf); +} + +static int +read_2_signed_bytes (abfd, buf) + bfd *abfd; + char *buf; +{ + return bfd_get_signed_16 (abfd, (bfd_byte *) buf); +} + +static unsigned int +read_4_bytes (abfd, buf) + bfd *abfd; + char *buf; +{ + return bfd_get_32 (abfd, (bfd_byte *) buf); +} + +static int +read_4_signed_bytes (abfd, buf) + bfd *abfd; + char *buf; +{ + return bfd_get_signed_32 (abfd, (bfd_byte *) buf); +} + +static unsigned int +read_8_bytes (abfd, buf) + bfd *abfd; + char *buf; +{ + return bfd_get_64 (abfd, (bfd_byte *) buf); +} + +static CORE_ADDR +read_address (abfd, buf) + bfd *abfd; + char *buf; +{ + CORE_ADDR retval = 0; + + switch (address_size) + { + case 4: + retval = bfd_get_32 (abfd, (bfd_byte *) buf); + break; + case 8: + retval = bfd_get_64 (abfd, (bfd_byte *) buf); + break; + default: + /* *THE* alternative is 8, right? */ + abort (); + } + /* If the address being read is larger than the address that is + applicable for the object file format then mask it down to the + correct size. Take care to avoid unnecessary shift or shift + overflow */ + if (address_size > address_significant_size + && address_significant_size < sizeof (CORE_ADDR)) + { + CORE_ADDR mask = ((CORE_ADDR) 0) - 1; + retval &= ~(mask << (address_significant_size * 8)); + } + return retval; +} + +static char * +read_n_bytes (abfd, buf, size) + bfd * abfd; + char *buf; + unsigned int size; +{ + /* If the size of a host char is 8 bits, we can return a pointer + to the buffer, otherwise we have to copy the data to a buffer + allocated on the temporary obstack. */ +#if HOST_CHAR_BIT == 8 + return buf; +#else + char *ret; + unsigned int i; + + ret = obstack_alloc (&dwarf2_tmp_obstack, size); + for (i = 0; i < size; ++i) + { + ret[i] = bfd_get_8 (abfd, (bfd_byte *) buf); + buf++; + } + return ret; +#endif +} + +static char * +read_string (abfd, buf, bytes_read_ptr) + bfd *abfd; + char *buf; + unsigned int *bytes_read_ptr; +{ + /* If the size of a host char is 8 bits, we can return a pointer + to the string, otherwise we have to copy the string to a buffer + allocated on the temporary obstack. */ +#if HOST_CHAR_BIT == 8 + if (*buf == '\0') + { + *bytes_read_ptr = 1; + return NULL; + } + *bytes_read_ptr = strlen (buf) + 1; + return buf; +#else + int byte; + unsigned int i = 0; + + while ((byte = bfd_get_8 (abfd, (bfd_byte *) buf)) != 0) + { + obstack_1grow (&dwarf2_tmp_obstack, byte); + i++; + buf++; + } + if (i == 0) + { + *bytes_read_ptr = 1; + return NULL; + } + obstack_1grow (&dwarf2_tmp_obstack, '\0'); + *bytes_read_ptr = i + 1; + return obstack_finish (&dwarf2_tmp_obstack); +#endif +} + +static unsigned int +read_unsigned_leb128 (abfd, buf, bytes_read_ptr) + bfd *abfd; + char *buf; + unsigned int *bytes_read_ptr; +{ + unsigned int result, num_read; + int i, shift; + unsigned char byte; + + result = 0; + shift = 0; + num_read = 0; + i = 0; + while (1) + { + byte = bfd_get_8 (abfd, (bfd_byte *) buf); + buf++; + num_read++; + result |= ((byte & 127) << shift); + if ((byte & 128) == 0) + { + break; + } + shift += 7; + } + *bytes_read_ptr = num_read; + return result; +} + +static int +read_signed_leb128 (abfd, buf, bytes_read_ptr) + bfd *abfd; + char *buf; + unsigned int *bytes_read_ptr; +{ + int result; + int i, shift, size, num_read; + unsigned char byte; + + result = 0; + shift = 0; + size = 32; + num_read = 0; + i = 0; + while (1) + { + byte = bfd_get_8 (abfd, (bfd_byte *) buf); + buf++; + num_read++; + result |= ((byte & 127) << shift); + shift += 7; + if ((byte & 128) == 0) + { + break; + } + } + if ((shift < size) && (byte & 0x40)) + { + result |= -(1 << shift); + } + *bytes_read_ptr = num_read; + return result; +} + +static void +set_cu_language (lang) + unsigned int lang; +{ + switch (lang) + { + case DW_LANG_C89: + case DW_LANG_C: + cu_language = language_c; + break; + case DW_LANG_C_plus_plus: + cu_language = language_cplus; + break; + case DW_LANG_Fortran77: + case DW_LANG_Fortran90: + cu_language = language_fortran; + break; + case DW_LANG_Mips_Assembler: + cu_language = language_asm; + break; + case DW_LANG_Ada83: + case DW_LANG_Cobol74: + case DW_LANG_Cobol85: + case DW_LANG_Pascal83: + case DW_LANG_Modula2: + default: + cu_language = language_unknown; + break; + } + cu_language_defn = language_def (cu_language); +} + +/* Return the named attribute or NULL if not there. */ + +static struct attribute * +dwarf_attr (die, name) + struct die_info *die; + unsigned int name; +{ + unsigned int i; + struct attribute *spec = NULL; + + for (i = 0; i < die->num_attrs; ++i) + { + if (die->attrs[i].name == name) + { + return &die->attrs[i]; + } + if (die->attrs[i].name == DW_AT_specification + || die->attrs[i].name == DW_AT_abstract_origin) + spec = &die->attrs[i]; + } + if (spec) + { + struct die_info *ref_die = + follow_die_ref (dwarf2_get_ref_die_offset (spec)); + + if (ref_die) + return dwarf_attr (ref_die, name); + } + + return NULL; +} + +/* Decode the line number information for the compilation unit whose + line number info is at OFFSET in the .debug_line section. + The compilation directory of the file is passed in COMP_DIR. */ + +struct filenames +{ + unsigned int num_files; + struct fileinfo + { + char *name; + unsigned int dir; + unsigned int time; + unsigned int size; + } + *files; +}; + +struct directories +{ + unsigned int num_dirs; + char **dirs; +}; + +static void +dwarf_decode_lines (offset, comp_dir, abfd) + unsigned int offset; + char *comp_dir; + bfd *abfd; +{ + char *line_ptr; + char *line_end; + struct line_head lh; + struct cleanup *back_to; + unsigned int i, bytes_read; + char *cur_file, *cur_dir; + unsigned char op_code, extended_op, adj_opcode; + +#define FILE_ALLOC_CHUNK 5 +#define DIR_ALLOC_CHUNK 5 + + struct filenames files; + struct directories dirs; + + if (dwarf_line_buffer == NULL) + { + complain (&dwarf2_missing_line_number_section); + return; + } + + files.num_files = 0; + files.files = NULL; + + dirs.num_dirs = 0; + dirs.dirs = NULL; + + line_ptr = dwarf_line_buffer + offset; + + /* read in the prologue */ + lh.total_length = read_4_bytes (abfd, line_ptr); + line_ptr += 4; + line_end = line_ptr + lh.total_length; + lh.version = read_2_bytes (abfd, line_ptr); + line_ptr += 2; + lh.prologue_length = read_4_bytes (abfd, line_ptr); + line_ptr += 4; + lh.minimum_instruction_length = read_1_byte (abfd, line_ptr); + line_ptr += 1; + lh.default_is_stmt = read_1_byte (abfd, line_ptr); + line_ptr += 1; + lh.line_base = read_1_signed_byte (abfd, line_ptr); + line_ptr += 1; + lh.line_range = read_1_byte (abfd, line_ptr); + line_ptr += 1; + lh.opcode_base = read_1_byte (abfd, line_ptr); + line_ptr += 1; + lh.standard_opcode_lengths = (unsigned char *) + xmalloc (lh.opcode_base * sizeof (unsigned char)); + back_to = make_cleanup ((make_cleanup_func) free_current_contents, + &lh.standard_opcode_lengths); + + lh.standard_opcode_lengths[0] = 1; + for (i = 1; i < lh.opcode_base; ++i) + { + lh.standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr); + line_ptr += 1; + } + + /* Read directory table */ + while ((cur_dir = read_string (abfd, line_ptr, &bytes_read)) != NULL) + { + line_ptr += bytes_read; + if ((dirs.num_dirs % DIR_ALLOC_CHUNK) == 0) + { + dirs.dirs = (char **) + xrealloc (dirs.dirs, + (dirs.num_dirs + DIR_ALLOC_CHUNK) * sizeof (char *)); + if (dirs.num_dirs == 0) + make_cleanup ((make_cleanup_func) free_current_contents, &dirs.dirs); + } + dirs.dirs[dirs.num_dirs++] = cur_dir; + } + line_ptr += bytes_read; + + /* Read file name table */ + while ((cur_file = read_string (abfd, line_ptr, &bytes_read)) != NULL) + { + line_ptr += bytes_read; + if ((files.num_files % FILE_ALLOC_CHUNK) == 0) + { + files.files = (struct fileinfo *) + xrealloc (files.files, + (files.num_files + FILE_ALLOC_CHUNK) + * sizeof (struct fileinfo)); + if (files.num_files == 0) + make_cleanup ((make_cleanup_func) free_current_contents, + &files.files); + } + files.files[files.num_files].name = cur_file; + files.files[files.num_files].dir = + read_unsigned_leb128 (abfd, line_ptr, &bytes_read); + line_ptr += bytes_read; + files.files[files.num_files].time = + read_unsigned_leb128 (abfd, line_ptr, &bytes_read); + line_ptr += bytes_read; + files.files[files.num_files].size = + read_unsigned_leb128 (abfd, line_ptr, &bytes_read); + line_ptr += bytes_read; + files.num_files++; + } + line_ptr += bytes_read; + + /* Read the statement sequences until there's nothing left. */ + while (line_ptr < line_end) + { + /* state machine registers */ + CORE_ADDR address = 0; + unsigned int file = 1; + unsigned int line = 1; + unsigned int column = 0; + int is_stmt = lh.default_is_stmt; + int basic_block = 0; + int end_sequence = 0; + + /* Start a subfile for the current file of the state machine. */ + if (files.num_files >= file) + { + /* The file and directory tables are 0 based, the references + are 1 based. */ + dwarf2_start_subfile (files.files[file - 1].name, + (files.files[file - 1].dir + ? dirs.dirs[files.files[file - 1].dir - 1] + : comp_dir)); + } + + /* Decode the table. */ + while (! end_sequence) + { + op_code = read_1_byte (abfd, line_ptr); + line_ptr += 1; + switch (op_code) + { + case DW_LNS_extended_op: + line_ptr += 1; /* ignore length */ + extended_op = read_1_byte (abfd, line_ptr); + line_ptr += 1; + switch (extended_op) + { + case DW_LNE_end_sequence: + end_sequence = 1; + record_line (current_subfile, line, address); + break; + case DW_LNE_set_address: + address = read_address (abfd, line_ptr) + baseaddr; + line_ptr += address_size; + break; + case DW_LNE_define_file: + cur_file = read_string (abfd, line_ptr, &bytes_read); + line_ptr += bytes_read; + if ((files.num_files % FILE_ALLOC_CHUNK) == 0) + { + files.files = (struct fileinfo *) + xrealloc (files.files, + (files.num_files + FILE_ALLOC_CHUNK) + * sizeof (struct fileinfo)); + if (files.num_files == 0) + make_cleanup ((make_cleanup_func) free_current_contents, + &files.files); + } + files.files[files.num_files].name = cur_file; + files.files[files.num_files].dir = + read_unsigned_leb128 (abfd, line_ptr, &bytes_read); + line_ptr += bytes_read; + files.files[files.num_files].time = + read_unsigned_leb128 (abfd, line_ptr, &bytes_read); + line_ptr += bytes_read; + files.files[files.num_files].size = + read_unsigned_leb128 (abfd, line_ptr, &bytes_read); + line_ptr += bytes_read; + files.num_files++; + break; + default: + complain (&dwarf2_mangled_line_number_section); + goto done; + } + break; + case DW_LNS_copy: + record_line (current_subfile, line, address); + basic_block = 0; + break; + case DW_LNS_advance_pc: + address += lh.minimum_instruction_length + * read_unsigned_leb128 (abfd, line_ptr, &bytes_read); + line_ptr += bytes_read; + break; + case DW_LNS_advance_line: + line += read_signed_leb128 (abfd, line_ptr, &bytes_read); + line_ptr += bytes_read; + break; + case DW_LNS_set_file: + /* The file and directory tables are 0 based, the references + are 1 based. */ + file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); + line_ptr += bytes_read; + dwarf2_start_subfile + (files.files[file - 1].name, + (files.files[file - 1].dir + ? dirs.dirs[files.files[file - 1].dir - 1] + : comp_dir)); + break; + case DW_LNS_set_column: + column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); + line_ptr += bytes_read; + break; + case DW_LNS_negate_stmt: + is_stmt = (!is_stmt); + break; + case DW_LNS_set_basic_block: + basic_block = 1; + break; + case DW_LNS_const_add_pc: + address += (255 - lh.opcode_base) / lh.line_range; + break; + case DW_LNS_fixed_advance_pc: + address += read_2_bytes (abfd, line_ptr); + line_ptr += 2; + break; + default: /* special operand */ + adj_opcode = op_code - lh.opcode_base; + address += (adj_opcode / lh.line_range) + * lh.minimum_instruction_length; + line += lh.line_base + (adj_opcode % lh.line_range); + /* append row to matrix using current values */ + record_line (current_subfile, line, address); + basic_block = 1; + } + } + } +done: + do_cleanups (back_to); +} + +/* Start a subfile for DWARF. FILENAME is the name of the file and + DIRNAME the name of the source directory which contains FILENAME + or NULL if not known. + This routine tries to keep line numbers from identical absolute and + relative file names in a common subfile. + + Using the `list' example from the GDB testsuite, which resides in + /srcdir and compiling it with Irix6.2 cc in /compdir using a filename + of /srcdir/list0.c yields the following debugging information for list0.c: + + DW_AT_name: /srcdir/list0.c + DW_AT_comp_dir: /compdir + files.files[0].name: list0.h + files.files[0].dir: /srcdir + files.files[1].name: list0.c + files.files[1].dir: /srcdir + + The line number information for list0.c has to end up in a single + subfile, so that `break /srcdir/list0.c:1' works as expected. */ + +static void +dwarf2_start_subfile (filename, dirname) + char *filename; + char *dirname; +{ + /* If the filename isn't absolute, try to match an existing subfile + with the full pathname. */ + + if (*filename != '/' && dirname != NULL) + { + struct subfile *subfile; + char *fullname = concat (dirname, "/", filename, NULL); + + for (subfile = subfiles; subfile; subfile = subfile->next) + { + if (STREQ (subfile->name, fullname)) + { + current_subfile = subfile; + free (fullname); + return; + } + } + free (fullname); + } + start_subfile (filename, dirname); +} + +/* Given a pointer to a DWARF information entry, figure out if we need + to make a symbol table entry for it, and if so, create a new entry + and return a pointer to it. + If TYPE is NULL, determine symbol type from the die, otherwise + used the passed type. + */ + +static struct symbol * +new_symbol (die, type, objfile) + struct die_info *die; + struct type *type; + struct objfile *objfile; +{ + struct symbol *sym = NULL; + char *name; + struct attribute *attr = NULL; + struct attribute *attr2 = NULL; + CORE_ADDR addr; + + name = dwarf2_linkage_name (die); + if (name) + { + sym = (struct symbol *) obstack_alloc (&objfile->symbol_obstack, + sizeof (struct symbol)); + OBJSTAT (objfile, n_syms++); + memset (sym, 0, sizeof (struct symbol)); + SYMBOL_NAME (sym) = obsavestring (name, strlen (name), + &objfile->symbol_obstack); + + /* Default assumptions. + Use the passed type or decode it from the die. */ + SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE; + SYMBOL_CLASS (sym) = LOC_STATIC; + if (type != NULL) + SYMBOL_TYPE (sym) = type; + else + SYMBOL_TYPE (sym) = die_type (die, objfile); + attr = dwarf_attr (die, DW_AT_decl_line); + if (attr) + { + SYMBOL_LINE (sym) = DW_UNSND (attr); + } + + /* If this symbol is from a C++ compilation, then attempt to + cache the demangled form for future reference. This is a + typical time versus space tradeoff, that was decided in favor + of time because it sped up C++ symbol lookups by a factor of + about 20. */ + + SYMBOL_LANGUAGE (sym) = cu_language; + SYMBOL_INIT_DEMANGLED_NAME (sym, &objfile->symbol_obstack); + switch (die->tag) + { + case DW_TAG_label: + attr = dwarf_attr (die, DW_AT_low_pc); + if (attr) + { + SYMBOL_VALUE_ADDRESS (sym) = DW_ADDR (attr) + baseaddr; + } + SYMBOL_CLASS (sym) = LOC_LABEL; + break; + case DW_TAG_subprogram: + /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by + finish_block. */ + SYMBOL_CLASS (sym) = LOC_BLOCK; + attr2 = dwarf_attr (die, DW_AT_external); + if (attr2 && (DW_UNSND (attr2) != 0)) + { + add_symbol_to_list (sym, &global_symbols); + } + else + { + add_symbol_to_list (sym, list_in_scope); + } + break; + case DW_TAG_variable: + /* Compilation with minimal debug info may result in variables + with missing type entries. Change the misleading `void' type + to something sensible. */ + if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID) + SYMBOL_TYPE (sym) = init_type (TYPE_CODE_INT, + TARGET_INT_BIT / HOST_CHAR_BIT, 0, + "<variable, no debug info>", + objfile); + attr = dwarf_attr (die, DW_AT_const_value); + if (attr) + { + dwarf2_const_value (attr, sym, objfile); + attr2 = dwarf_attr (die, DW_AT_external); + if (attr2 && (DW_UNSND (attr2) != 0)) + add_symbol_to_list (sym, &global_symbols); + else + add_symbol_to_list (sym, list_in_scope); + break; + } + attr = dwarf_attr (die, DW_AT_location); + if (attr) + { + attr2 = dwarf_attr (die, DW_AT_external); + if (attr2 && (DW_UNSND (attr2) != 0)) + { + SYMBOL_VALUE_ADDRESS (sym) = + decode_locdesc (DW_BLOCK (attr), objfile); + add_symbol_to_list (sym, &global_symbols); + + /* In shared libraries the address of the variable + in the location descriptor might still be relocatable, + so its value could be zero. + Enter the symbol as a LOC_UNRESOLVED symbol, if its + value is zero, the address of the variable will then + be determined from the minimal symbol table whenever + the variable is referenced. */ + if (SYMBOL_VALUE_ADDRESS (sym)) + { + SYMBOL_VALUE_ADDRESS (sym) += baseaddr; + SYMBOL_CLASS (sym) = LOC_STATIC; + } + else + SYMBOL_CLASS (sym) = LOC_UNRESOLVED; + } + else + { + SYMBOL_VALUE (sym) = addr = + decode_locdesc (DW_BLOCK (attr), objfile); + add_symbol_to_list (sym, list_in_scope); + if (optimized_out) + { + SYMBOL_CLASS (sym) = LOC_OPTIMIZED_OUT; + } + else if (isreg) + { + SYMBOL_CLASS (sym) = LOC_REGISTER; + } + else if (offreg) + { + SYMBOL_CLASS (sym) = LOC_BASEREG; + SYMBOL_BASEREG (sym) = basereg; + } + else if (islocal) + { + SYMBOL_CLASS (sym) = LOC_LOCAL; + } + else + { + SYMBOL_CLASS (sym) = LOC_STATIC; + SYMBOL_VALUE_ADDRESS (sym) = addr + baseaddr; + } + } + } + else + { + /* We do not know the address of this symbol. + If it is an external symbol and we have type information + for it, enter the symbol as a LOC_UNRESOLVED symbol. + The address of the variable will then be determined from + the minimal symbol table whenever the variable is + referenced. */ + attr2 = dwarf_attr (die, DW_AT_external); + if (attr2 && (DW_UNSND (attr2) != 0) + && dwarf_attr (die, DW_AT_type) != NULL) + { + SYMBOL_CLASS (sym) = LOC_UNRESOLVED; + add_symbol_to_list (sym, &global_symbols); + } + } + break; + case DW_TAG_formal_parameter: + attr = dwarf_attr (die, DW_AT_location); + if (attr) + { + SYMBOL_VALUE (sym) = decode_locdesc (DW_BLOCK (attr), objfile); + if (isreg) + { + SYMBOL_CLASS (sym) = LOC_REGPARM; + } + else if (offreg) + { + SYMBOL_CLASS (sym) = LOC_BASEREG_ARG; + SYMBOL_BASEREG (sym) = basereg; + } + else + { + SYMBOL_CLASS (sym) = LOC_ARG; + } + } + attr = dwarf_attr (die, DW_AT_const_value); + if (attr) + { + dwarf2_const_value (attr, sym, objfile); + } + add_symbol_to_list (sym, list_in_scope); + break; + case DW_TAG_unspecified_parameters: + /* From varargs functions; gdb doesn't seem to have any + interest in this information, so just ignore it for now. + (FIXME?) */ + break; + case DW_TAG_class_type: + case DW_TAG_structure_type: + case DW_TAG_union_type: + case DW_TAG_enumeration_type: + SYMBOL_CLASS (sym) = LOC_TYPEDEF; + SYMBOL_NAMESPACE (sym) = STRUCT_NAMESPACE; + add_symbol_to_list (sym, list_in_scope); + + /* The semantics of C++ state that "struct foo { ... }" also + defines a typedef for "foo". Synthesize a typedef symbol so + that "ptype foo" works as expected. */ + if (cu_language == language_cplus) + { + struct symbol *typedef_sym = (struct symbol *) + obstack_alloc (&objfile->symbol_obstack, + sizeof (struct symbol)); + *typedef_sym = *sym; + SYMBOL_NAMESPACE (typedef_sym) = VAR_NAMESPACE; + if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0) + TYPE_NAME (SYMBOL_TYPE (sym)) = + obsavestring (SYMBOL_NAME (sym), + strlen (SYMBOL_NAME (sym)), + &objfile->type_obstack); + add_symbol_to_list (typedef_sym, list_in_scope); + } + break; + case DW_TAG_typedef: + case DW_TAG_base_type: + SYMBOL_CLASS (sym) = LOC_TYPEDEF; + SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE; + add_symbol_to_list (sym, list_in_scope); + break; + case DW_TAG_enumerator: + attr = dwarf_attr (die, DW_AT_const_value); + if (attr) + { + dwarf2_const_value (attr, sym, objfile); + } + add_symbol_to_list (sym, list_in_scope); + break; + default: + /* Not a tag we recognize. Hopefully we aren't processing + trash data, but since we must specifically ignore things + we don't recognize, there is nothing else we should do at + this point. */ + complain (&dwarf2_unsupported_tag, dwarf_tag_name (die->tag)); + break; + } + } + return (sym); +} + +/* Copy constant value from an attribute to a symbol. */ + +static void +dwarf2_const_value (attr, sym, objfile) + struct attribute *attr; + struct symbol *sym; + struct objfile *objfile; +{ + struct dwarf_block *blk; + + switch (attr->form) + { + case DW_FORM_addr: + if (TYPE_LENGTH (SYMBOL_TYPE (sym)) != (unsigned int) address_size) + complain (&dwarf2_const_value_length_mismatch, SYMBOL_NAME (sym), + address_size, TYPE_LENGTH (SYMBOL_TYPE (sym))); + SYMBOL_VALUE_BYTES (sym) = (char *) + obstack_alloc (&objfile->symbol_obstack, address_size); + store_address (SYMBOL_VALUE_BYTES (sym), address_size, DW_ADDR (attr)); + SYMBOL_CLASS (sym) = LOC_CONST_BYTES; + break; + case DW_FORM_block1: + case DW_FORM_block2: + case DW_FORM_block4: + case DW_FORM_block: + blk = DW_BLOCK (attr); + if (TYPE_LENGTH (SYMBOL_TYPE (sym)) != blk->size) + complain (&dwarf2_const_value_length_mismatch, SYMBOL_NAME (sym), + blk->size, TYPE_LENGTH (SYMBOL_TYPE (sym))); + SYMBOL_VALUE_BYTES (sym) = (char *) + obstack_alloc (&objfile->symbol_obstack, blk->size); + memcpy (SYMBOL_VALUE_BYTES (sym), blk->data, blk->size); + SYMBOL_CLASS (sym) = LOC_CONST_BYTES; + break; + case DW_FORM_data2: + case DW_FORM_data4: + case DW_FORM_data8: + case DW_FORM_data1: + case DW_FORM_sdata: + case DW_FORM_udata: + SYMBOL_VALUE (sym) = DW_UNSND (attr); + SYMBOL_CLASS (sym) = LOC_CONST; + break; + default: + complain (&dwarf2_unsupported_const_value_attr, + dwarf_form_name (attr->form)); + SYMBOL_VALUE (sym) = 0; + SYMBOL_CLASS (sym) = LOC_CONST; + break; + } +} + +/* Return the type of the die in question using its DW_AT_type attribute. */ + +static struct type * +die_type (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + struct type *type; + struct attribute *type_attr; + struct die_info *type_die; + unsigned int ref; + + type_attr = dwarf_attr (die, DW_AT_type); + if (!type_attr) + { + /* A missing DW_AT_type represents a void type. */ + return dwarf2_fundamental_type (objfile, FT_VOID); + } + else + { + ref = dwarf2_get_ref_die_offset (type_attr); + type_die = follow_die_ref (ref); + if (!type_die) + { + error ("Dwarf Error: Cannot find referent at offset %d.", ref); + return NULL; + } + } + type = tag_type_to_type (type_die, objfile); + if (!type) + { + dump_die (type_die); + error ("Dwarf Error: Problem turning type die at offset into gdb type."); + } + return type; +} + +/* Return the containing type of the die in question using its + DW_AT_containing_type attribute. */ + +static struct type * +die_containing_type (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + struct type *type = NULL; + struct attribute *type_attr; + struct die_info *type_die = NULL; + unsigned int ref; + + type_attr = dwarf_attr (die, DW_AT_containing_type); + if (type_attr) + { + ref = dwarf2_get_ref_die_offset (type_attr); + type_die = follow_die_ref (ref); + if (!type_die) + { + error ("Dwarf Error: Cannot find referent at offset %d.", ref); + return NULL; + } + type = tag_type_to_type (type_die, objfile); + } + if (!type) + { + if (type_die) + dump_die (type_die); + error ("Dwarf Error: Problem turning containing type into gdb type."); + } + return type; +} + +#if 0 +static struct type * +type_at_offset (offset, objfile) + unsigned int offset; + struct objfile *objfile; +{ + struct die_info *die; + struct type *type; + + die = follow_die_ref (offset); + if (!die) + { + error ("Dwarf Error: Cannot find type referent at offset %d.", offset); + return NULL; + } + type = tag_type_to_type (die, objfile); + return type; +} +#endif + +static struct type * +tag_type_to_type (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + if (die->type) + { + return die->type; + } + else + { + read_type_die (die, objfile); + if (!die->type) + { + dump_die (die); + error ("Dwarf Error: Cannot find type of die."); + } + return die->type; + } +} + +static void +read_type_die (die, objfile) + struct die_info *die; + struct objfile *objfile; +{ + switch (die->tag) + { + case DW_TAG_class_type: + case DW_TAG_structure_type: + case DW_TAG_union_type: + read_structure_scope (die, objfile); + break; + case DW_TAG_enumeration_type: + read_enumeration (die, objfile); + break; + case DW_TAG_subprogram: + case DW_TAG_subroutine_type: + read_subroutine_type (die, objfile); + break; + case DW_TAG_array_type: + read_array_type (die, objfile); + break; + case DW_TAG_pointer_type: + read_tag_pointer_type (die, objfile); + break; + case DW_TAG_ptr_to_member_type: + read_tag_ptr_to_member_type (die, objfile); + break; + case DW_TAG_reference_type: + read_tag_reference_type (die, objfile); + break; + case DW_TAG_const_type: + read_tag_const_type (die, objfile); + break; + case DW_TAG_volatile_type: + read_tag_volatile_type (die, objfile); + break; + case DW_TAG_string_type: + read_tag_string_type (die, objfile); + break; + case DW_TAG_typedef: + read_typedef (die, objfile); + break; + case DW_TAG_base_type: + read_base_type (die, objfile); + break; + default: + complain (&dwarf2_unexpected_tag, dwarf_tag_name (die->tag)); + break; + } +} + +static struct type * +dwarf_base_type (encoding, size, objfile) + int encoding; + int size; + struct objfile *objfile; +{ + /* FIXME - this should not produce a new (struct type *) + every time. It should cache base types. */ + struct type *type; + switch (encoding) + { + case DW_ATE_address: + type = dwarf2_fundamental_type (objfile, FT_VOID); + return type; + case DW_ATE_boolean: + type = dwarf2_fundamental_type (objfile, FT_BOOLEAN); + return type; + case DW_ATE_complex_float: + if (size == 16) + { + type = dwarf2_fundamental_type (objfile, FT_DBL_PREC_COMPLEX); + } + else + { + type = dwarf2_fundamental_type (objfile, FT_COMPLEX); + } + return type; + case DW_ATE_float: + if (size == 8) + { + type = dwarf2_fundamental_type (objfile, FT_DBL_PREC_FLOAT); + } + else + { + type = dwarf2_fundamental_type (objfile, FT_FLOAT); + } + return type; + case DW_ATE_signed: + switch (size) + { + case 1: + type = dwarf2_fundamental_type (objfile, FT_SIGNED_CHAR); + break; + case 2: + type = dwarf2_fundamental_type (objfile, FT_SIGNED_SHORT); + break; + default: + case 4: + type = dwarf2_fundamental_type (objfile, FT_SIGNED_INTEGER); + break; + } + return type; + case DW_ATE_signed_char: + type = dwarf2_fundamental_type (objfile, FT_SIGNED_CHAR); + return type; + case DW_ATE_unsigned: + switch (size) + { + case 1: + type = dwarf2_fundamental_type (objfile, FT_UNSIGNED_CHAR); + break; + case 2: + type = dwarf2_fundamental_type (objfile, FT_UNSIGNED_SHORT); + break; + default: + case 4: + type = dwarf2_fundamental_type (objfile, FT_UNSIGNED_INTEGER); + break; + } + return type; + case DW_ATE_unsigned_char: + type = dwarf2_fundamental_type (objfile, FT_UNSIGNED_CHAR); + return type; + default: + type = dwarf2_fundamental_type (objfile, FT_SIGNED_INTEGER); + return type; + } +} + +#if 0 +struct die_info * +copy_die (old_die) + struct die_info *old_die; +{ + struct die_info *new_die; + int i, num_attrs; + + new_die = (struct die_info *) xmalloc (sizeof (struct die_info)); + memset (new_die, 0, sizeof (struct die_info)); + + new_die->tag = old_die->tag; + new_die->has_children = old_die->has_children; + new_die->abbrev = old_die->abbrev; + new_die->offset = old_die->offset; + new_die->type = NULL; + + num_attrs = old_die->num_attrs; + new_die->num_attrs = num_attrs; + new_die->attrs = (struct attribute *) + xmalloc (num_attrs * sizeof (struct attribute)); + + for (i = 0; i < old_die->num_attrs; ++i) + { + new_die->attrs[i].name = old_die->attrs[i].name; + new_die->attrs[i].form = old_die->attrs[i].form; + new_die->attrs[i].u.addr = old_die->attrs[i].u.addr; + } + + new_die->next = NULL; + return new_die; +} +#endif + +/* Return sibling of die, NULL if no sibling. */ + +struct die_info * +sibling_die (die) + struct die_info *die; +{ + int nesting_level = 0; + + if (!die->has_children) + { + if (die->next && (die->next->tag == 0)) + { + return NULL; + } + else + { + return die->next; + } + } + else + { + do + { + if (die->has_children) + { + nesting_level++; + } + if (die->tag == 0) + { + nesting_level--; + } + die = die->next; + } + while (nesting_level); + if (die && (die->tag == 0)) + { + return NULL; + } + else + { + return die; + } + } +} + +/* Get linkage name of a die, return NULL if not found. */ + +static char * +dwarf2_linkage_name (die) + struct die_info *die; +{ + struct attribute *attr; + + attr = dwarf_attr (die, DW_AT_MIPS_linkage_name); + if (attr && DW_STRING (attr)) + return DW_STRING (attr); + attr = dwarf_attr (die, DW_AT_name); + if (attr && DW_STRING (attr)) + return DW_STRING (attr); + return NULL; +} + +/* Convert a DIE tag into its string name. */ + +static char * +dwarf_tag_name (tag) + register unsigned tag; +{ + switch (tag) + { + case DW_TAG_padding: + return "DW_TAG_padding"; + case DW_TAG_array_type: + return "DW_TAG_array_type"; + case DW_TAG_class_type: + return "DW_TAG_class_type"; + case DW_TAG_entry_point: + return "DW_TAG_entry_point"; + case DW_TAG_enumeration_type: + return "DW_TAG_enumeration_type"; + case DW_TAG_formal_parameter: + return "DW_TAG_formal_parameter"; + case DW_TAG_imported_declaration: + return "DW_TAG_imported_declaration"; + case DW_TAG_label: + return "DW_TAG_label"; + case DW_TAG_lexical_block: + return "DW_TAG_lexical_block"; + case DW_TAG_member: + return "DW_TAG_member"; + case DW_TAG_pointer_type: + return "DW_TAG_pointer_type"; + case DW_TAG_reference_type: + return "DW_TAG_reference_type"; + case DW_TAG_compile_unit: + return "DW_TAG_compile_unit"; + case DW_TAG_string_type: + return "DW_TAG_string_type"; + case DW_TAG_structure_type: + return "DW_TAG_structure_type"; + case DW_TAG_subroutine_type: + return "DW_TAG_subroutine_type"; + case DW_TAG_typedef: + return "DW_TAG_typedef"; + case DW_TAG_union_type: + return "DW_TAG_union_type"; + case DW_TAG_unspecified_parameters: + return "DW_TAG_unspecified_parameters"; + case DW_TAG_variant: + return "DW_TAG_variant"; + case DW_TAG_common_block: + return "DW_TAG_common_block"; + case DW_TAG_common_inclusion: + return "DW_TAG_common_inclusion"; + case DW_TAG_inheritance: + return "DW_TAG_inheritance"; + case DW_TAG_inlined_subroutine: + return "DW_TAG_inlined_subroutine"; + case DW_TAG_module: + return "DW_TAG_module"; + case DW_TAG_ptr_to_member_type: + return "DW_TAG_ptr_to_member_type"; + case DW_TAG_set_type: + return "DW_TAG_set_type"; + case DW_TAG_subrange_type: + return "DW_TAG_subrange_type"; + case DW_TAG_with_stmt: + return "DW_TAG_with_stmt"; + case DW_TAG_access_declaration: + return "DW_TAG_access_declaration"; + case DW_TAG_base_type: + return "DW_TAG_base_type"; + case DW_TAG_catch_block: + return "DW_TAG_catch_block"; + case DW_TAG_const_type: + return "DW_TAG_const_type"; + case DW_TAG_constant: + return "DW_TAG_constant"; + case DW_TAG_enumerator: + return "DW_TAG_enumerator"; + case DW_TAG_file_type: + return "DW_TAG_file_type"; + case DW_TAG_friend: + return "DW_TAG_friend"; + case DW_TAG_namelist: + return "DW_TAG_namelist"; + case DW_TAG_namelist_item: + return "DW_TAG_namelist_item"; + case DW_TAG_packed_type: + return "DW_TAG_packed_type"; + case DW_TAG_subprogram: + return "DW_TAG_subprogram"; + case DW_TAG_template_type_param: + return "DW_TAG_template_type_param"; + case DW_TAG_template_value_param: + return "DW_TAG_template_value_param"; + case DW_TAG_thrown_type: + return "DW_TAG_thrown_type"; + case DW_TAG_try_block: + return "DW_TAG_try_block"; + case DW_TAG_variant_part: + return "DW_TAG_variant_part"; + case DW_TAG_variable: + return "DW_TAG_variable"; + case DW_TAG_volatile_type: + return "DW_TAG_volatile_type"; + case DW_TAG_MIPS_loop: + return "DW_TAG_MIPS_loop"; + case DW_TAG_format_label: + return "DW_TAG_format_label"; + case DW_TAG_function_template: + return "DW_TAG_function_template"; + case DW_TAG_class_template: + return "DW_TAG_class_template"; + default: + return "DW_TAG_<unknown>"; + } +} + +/* Convert a DWARF attribute code into its string name. */ + +static char * +dwarf_attr_name (attr) + register unsigned attr; +{ + switch (attr) + { + case DW_AT_sibling: + return "DW_AT_sibling"; + case DW_AT_location: + return "DW_AT_location"; + case DW_AT_name: + return "DW_AT_name"; + case DW_AT_ordering: + return "DW_AT_ordering"; + case DW_AT_subscr_data: + return "DW_AT_subscr_data"; + case DW_AT_byte_size: + return "DW_AT_byte_size"; + case DW_AT_bit_offset: + return "DW_AT_bit_offset"; + case DW_AT_bit_size: + return "DW_AT_bit_size"; + case DW_AT_element_list: + return "DW_AT_element_list"; + case DW_AT_stmt_list: + return "DW_AT_stmt_list"; + case DW_AT_low_pc: + return "DW_AT_low_pc"; + case DW_AT_high_pc: + return "DW_AT_high_pc"; + case DW_AT_language: + return "DW_AT_language"; + case DW_AT_member: + return "DW_AT_member"; + case DW_AT_discr: + return "DW_AT_discr"; + case DW_AT_discr_value: + return "DW_AT_discr_value"; + case DW_AT_visibility: + return "DW_AT_visibility"; + case DW_AT_import: + return "DW_AT_import"; + case DW_AT_string_length: + return "DW_AT_string_length"; + case DW_AT_common_reference: + return "DW_AT_common_reference"; + case DW_AT_comp_dir: + return "DW_AT_comp_dir"; + case DW_AT_const_value: + return "DW_AT_const_value"; + case DW_AT_containing_type: + return "DW_AT_containing_type"; + case DW_AT_default_value: + return "DW_AT_default_value"; + case DW_AT_inline: + return "DW_AT_inline"; + case DW_AT_is_optional: + return "DW_AT_is_optional"; + case DW_AT_lower_bound: + return "DW_AT_lower_bound"; + case DW_AT_producer: + return "DW_AT_producer"; + case DW_AT_prototyped: + return "DW_AT_prototyped"; + case DW_AT_return_addr: + return "DW_AT_return_addr"; + case DW_AT_start_scope: + return "DW_AT_start_scope"; + case DW_AT_stride_size: + return "DW_AT_stride_size"; + case DW_AT_upper_bound: + return "DW_AT_upper_bound"; + case DW_AT_abstract_origin: + return "DW_AT_abstract_origin"; + case DW_AT_accessibility: + return "DW_AT_accessibility"; + case DW_AT_address_class: + return "DW_AT_address_class"; + case DW_AT_artificial: + return "DW_AT_artificial"; + case DW_AT_base_types: + return "DW_AT_base_types"; + case DW_AT_calling_convention: + return "DW_AT_calling_convention"; + case DW_AT_count: + return "DW_AT_count"; + case DW_AT_data_member_location: + return "DW_AT_data_member_location"; + case DW_AT_decl_column: + return "DW_AT_decl_column"; + case DW_AT_decl_file: + return "DW_AT_decl_file"; + case DW_AT_decl_line: + return "DW_AT_decl_line"; + case DW_AT_declaration: + return "DW_AT_declaration"; + case DW_AT_discr_list: + return "DW_AT_discr_list"; + case DW_AT_encoding: + return "DW_AT_encoding"; + case DW_AT_external: + return "DW_AT_external"; + case DW_AT_frame_base: + return "DW_AT_frame_base"; + case DW_AT_friend: + return "DW_AT_friend"; + case DW_AT_identifier_case: + return "DW_AT_identifier_case"; + case DW_AT_macro_info: + return "DW_AT_macro_info"; + case DW_AT_namelist_items: + return "DW_AT_namelist_items"; + case DW_AT_priority: + return "DW_AT_priority"; + case DW_AT_segment: + return "DW_AT_segment"; + case DW_AT_specification: + return "DW_AT_specification"; + case DW_AT_static_link: + return "DW_AT_static_link"; + case DW_AT_type: + return "DW_AT_type"; + case DW_AT_use_location: + return "DW_AT_use_location"; + case DW_AT_variable_parameter: + return "DW_AT_variable_parameter"; + case DW_AT_virtuality: + return "DW_AT_virtuality"; + case DW_AT_vtable_elem_location: + return "DW_AT_vtable_elem_location"; + +#ifdef MIPS + case DW_AT_MIPS_fde: + return "DW_AT_MIPS_fde"; + case DW_AT_MIPS_loop_begin: + return "DW_AT_MIPS_loop_begin"; + case DW_AT_MIPS_tail_loop_begin: + return "DW_AT_MIPS_tail_loop_begin"; + case DW_AT_MIPS_epilog_begin: + return "DW_AT_MIPS_epilog_begin"; + case DW_AT_MIPS_loop_unroll_factor: + return "DW_AT_MIPS_loop_unroll_factor"; + case DW_AT_MIPS_software_pipeline_depth: + return "DW_AT_MIPS_software_pipeline_depth"; + case DW_AT_MIPS_linkage_name: + return "DW_AT_MIPS_linkage_name"; +#endif + + case DW_AT_sf_names: + return "DW_AT_sf_names"; + case DW_AT_src_info: + return "DW_AT_src_info"; + case DW_AT_mac_info: + return "DW_AT_mac_info"; + case DW_AT_src_coords: + return "DW_AT_src_coords"; + case DW_AT_body_begin: + return "DW_AT_body_begin"; + case DW_AT_body_end: + return "DW_AT_body_end"; + default: + return "DW_AT_<unknown>"; + } +} + +/* Convert a DWARF value form code into its string name. */ + +static char * +dwarf_form_name (form) + register unsigned form; +{ + switch (form) + { + case DW_FORM_addr: + return "DW_FORM_addr"; + case DW_FORM_block2: + return "DW_FORM_block2"; + case DW_FORM_block4: + return "DW_FORM_block4"; + case DW_FORM_data2: + return "DW_FORM_data2"; + case DW_FORM_data4: + return "DW_FORM_data4"; + case DW_FORM_data8: + return "DW_FORM_data8"; + case DW_FORM_string: + return "DW_FORM_string"; + case DW_FORM_block: + return "DW_FORM_block"; + case DW_FORM_block1: + return "DW_FORM_block1"; + case DW_FORM_data1: + return "DW_FORM_data1"; + case DW_FORM_flag: + return "DW_FORM_flag"; + case DW_FORM_sdata: + return "DW_FORM_sdata"; + case DW_FORM_strp: + return "DW_FORM_strp"; + case DW_FORM_udata: + return "DW_FORM_udata"; + case DW_FORM_ref_addr: + return "DW_FORM_ref_addr"; + case DW_FORM_ref1: + return "DW_FORM_ref1"; + case DW_FORM_ref2: + return "DW_FORM_ref2"; + case DW_FORM_ref4: + return "DW_FORM_ref4"; + case DW_FORM_ref8: + return "DW_FORM_ref8"; + case DW_FORM_ref_udata: + return "DW_FORM_ref_udata"; + case DW_FORM_indirect: + return "DW_FORM_indirect"; + default: + return "DW_FORM_<unknown>"; + } +} + +/* Convert a DWARF stack opcode into its string name. */ + +static char * +dwarf_stack_op_name (op) + register unsigned op; +{ + switch (op) + { + case DW_OP_addr: + return "DW_OP_addr"; + case DW_OP_deref: + return "DW_OP_deref"; + case DW_OP_const1u: + return "DW_OP_const1u"; + case DW_OP_const1s: + return "DW_OP_const1s"; + case DW_OP_const2u: + return "DW_OP_const2u"; + case DW_OP_const2s: + return "DW_OP_const2s"; + case DW_OP_const4u: + return "DW_OP_const4u"; + case DW_OP_const4s: + return "DW_OP_const4s"; + case DW_OP_const8u: + return "DW_OP_const8u"; + case DW_OP_const8s: + return "DW_OP_const8s"; + case DW_OP_constu: + return "DW_OP_constu"; + case DW_OP_consts: + return "DW_OP_consts"; + case DW_OP_dup: + return "DW_OP_dup"; + case DW_OP_drop: + return "DW_OP_drop"; + case DW_OP_over: + return "DW_OP_over"; + case DW_OP_pick: + return "DW_OP_pick"; + case DW_OP_swap: + return "DW_OP_swap"; + case DW_OP_rot: + return "DW_OP_rot"; + case DW_OP_xderef: + return "DW_OP_xderef"; + case DW_OP_abs: + return "DW_OP_abs"; + case DW_OP_and: + return "DW_OP_and"; + case DW_OP_div: + return "DW_OP_div"; + case DW_OP_minus: + return "DW_OP_minus"; + case DW_OP_mod: + return "DW_OP_mod"; + case DW_OP_mul: + return "DW_OP_mul"; + case DW_OP_neg: + return "DW_OP_neg"; + case DW_OP_not: + return "DW_OP_not"; + case DW_OP_or: + return "DW_OP_or"; + case DW_OP_plus: + return "DW_OP_plus"; + case DW_OP_plus_uconst: + return "DW_OP_plus_uconst"; + case DW_OP_shl: + return "DW_OP_shl"; + case DW_OP_shr: + return "DW_OP_shr"; + case DW_OP_shra: + return "DW_OP_shra"; + case DW_OP_xor: + return "DW_OP_xor"; + case DW_OP_bra: + return "DW_OP_bra"; + case DW_OP_eq: + return "DW_OP_eq"; + case DW_OP_ge: + return "DW_OP_ge"; + case DW_OP_gt: + return "DW_OP_gt"; + case DW_OP_le: + return "DW_OP_le"; + case DW_OP_lt: + return "DW_OP_lt"; + case DW_OP_ne: + return "DW_OP_ne"; + case DW_OP_skip: + return "DW_OP_skip"; + case DW_OP_lit0: + return "DW_OP_lit0"; + case DW_OP_lit1: + return "DW_OP_lit1"; + case DW_OP_lit2: + return "DW_OP_lit2"; + case DW_OP_lit3: + return "DW_OP_lit3"; + case DW_OP_lit4: + return "DW_OP_lit4"; + case DW_OP_lit5: + return "DW_OP_lit5"; + case DW_OP_lit6: + return "DW_OP_lit6"; + case DW_OP_lit7: + return "DW_OP_lit7"; + case DW_OP_lit8: + return "DW_OP_lit8"; + case DW_OP_lit9: + return "DW_OP_lit9"; + case DW_OP_lit10: + return "DW_OP_lit10"; + case DW_OP_lit11: + return "DW_OP_lit11"; + case DW_OP_lit12: + return "DW_OP_lit12"; + case DW_OP_lit13: + return "DW_OP_lit13"; + case DW_OP_lit14: + return "DW_OP_lit14"; + case DW_OP_lit15: + return "DW_OP_lit15"; + case DW_OP_lit16: + return "DW_OP_lit16"; + case DW_OP_lit17: + return "DW_OP_lit17"; + case DW_OP_lit18: + return "DW_OP_lit18"; + case DW_OP_lit19: + return "DW_OP_lit19"; + case DW_OP_lit20: + return "DW_OP_lit20"; + case DW_OP_lit21: + return "DW_OP_lit21"; + case DW_OP_lit22: + return "DW_OP_lit22"; + case DW_OP_lit23: + return "DW_OP_lit23"; + case DW_OP_lit24: + return "DW_OP_lit24"; + case DW_OP_lit25: + return "DW_OP_lit25"; + case DW_OP_lit26: + return "DW_OP_lit26"; + case DW_OP_lit27: + return "DW_OP_lit27"; + case DW_OP_lit28: + return "DW_OP_lit28"; + case DW_OP_lit29: + return "DW_OP_lit29"; + case DW_OP_lit30: + return "DW_OP_lit30"; + case DW_OP_lit31: + return "DW_OP_lit31"; + case DW_OP_reg0: + return "DW_OP_reg0"; + case DW_OP_reg1: + return "DW_OP_reg1"; + case DW_OP_reg2: + return "DW_OP_reg2"; + case DW_OP_reg3: + return "DW_OP_reg3"; + case DW_OP_reg4: + return "DW_OP_reg4"; + case DW_OP_reg5: + return "DW_OP_reg5"; + case DW_OP_reg6: + return "DW_OP_reg6"; + case DW_OP_reg7: + return "DW_OP_reg7"; + case DW_OP_reg8: + return "DW_OP_reg8"; + case DW_OP_reg9: + return "DW_OP_reg9"; + case DW_OP_reg10: + return "DW_OP_reg10"; + case DW_OP_reg11: + return "DW_OP_reg11"; + case DW_OP_reg12: + return "DW_OP_reg12"; + case DW_OP_reg13: + return "DW_OP_reg13"; + case DW_OP_reg14: + return "DW_OP_reg14"; + case DW_OP_reg15: + return "DW_OP_reg15"; + case DW_OP_reg16: + return "DW_OP_reg16"; + case DW_OP_reg17: + return "DW_OP_reg17"; + case DW_OP_reg18: + return "DW_OP_reg18"; + case DW_OP_reg19: + return "DW_OP_reg19"; + case DW_OP_reg20: + return "DW_OP_reg20"; + case DW_OP_reg21: + return "DW_OP_reg21"; + case DW_OP_reg22: + return "DW_OP_reg22"; + case DW_OP_reg23: + return "DW_OP_reg23"; + case DW_OP_reg24: + return "DW_OP_reg24"; + case DW_OP_reg25: + return "DW_OP_reg25"; + case DW_OP_reg26: + return "DW_OP_reg26"; + case DW_OP_reg27: + return "DW_OP_reg27"; + case DW_OP_reg28: + return "DW_OP_reg28"; + case DW_OP_reg29: + return "DW_OP_reg29"; + case DW_OP_reg30: + return "DW_OP_reg30"; + case DW_OP_reg31: + return "DW_OP_reg31"; + case DW_OP_breg0: + return "DW_OP_breg0"; + case DW_OP_breg1: + return "DW_OP_breg1"; + case DW_OP_breg2: + return "DW_OP_breg2"; + case DW_OP_breg3: + return "DW_OP_breg3"; + case DW_OP_breg4: + return "DW_OP_breg4"; + case DW_OP_breg5: + return "DW_OP_breg5"; + case DW_OP_breg6: + return "DW_OP_breg6"; + case DW_OP_breg7: + return "DW_OP_breg7"; + case DW_OP_breg8: + return "DW_OP_breg8"; + case DW_OP_breg9: + return "DW_OP_breg9"; + case DW_OP_breg10: + return "DW_OP_breg10"; + case DW_OP_breg11: + return "DW_OP_breg11"; + case DW_OP_breg12: + return "DW_OP_breg12"; + case DW_OP_breg13: + return "DW_OP_breg13"; + case DW_OP_breg14: + return "DW_OP_breg14"; + case DW_OP_breg15: + return "DW_OP_breg15"; + case DW_OP_breg16: + return "DW_OP_breg16"; + case DW_OP_breg17: + return "DW_OP_breg17"; + case DW_OP_breg18: + return "DW_OP_breg18"; + case DW_OP_breg19: + return "DW_OP_breg19"; + case DW_OP_breg20: + return "DW_OP_breg20"; + case DW_OP_breg21: + return "DW_OP_breg21"; + case DW_OP_breg22: + return "DW_OP_breg22"; + case DW_OP_breg23: + return "DW_OP_breg23"; + case DW_OP_breg24: + return "DW_OP_breg24"; + case DW_OP_breg25: + return "DW_OP_breg25"; + case DW_OP_breg26: + return "DW_OP_breg26"; + case DW_OP_breg27: + return "DW_OP_breg27"; + case DW_OP_breg28: + return "DW_OP_breg28"; + case DW_OP_breg29: + return "DW_OP_breg29"; + case DW_OP_breg30: + return "DW_OP_breg30"; + case DW_OP_breg31: + return "DW_OP_breg31"; + case DW_OP_regx: + return "DW_OP_regx"; + case DW_OP_fbreg: + return "DW_OP_fbreg"; + case DW_OP_bregx: + return "DW_OP_bregx"; + case DW_OP_piece: + return "DW_OP_piece"; + case DW_OP_deref_size: + return "DW_OP_deref_size"; + case DW_OP_xderef_size: + return "DW_OP_xderef_size"; + case DW_OP_nop: + return "DW_OP_nop"; + default: + return "OP_<unknown>"; + } +} + +static char * +dwarf_bool_name (mybool) + unsigned mybool; +{ + if (mybool) + return "TRUE"; + else + return "FALSE"; +} + +/* Convert a DWARF type code into its string name. */ + +static char * +dwarf_type_encoding_name (enc) + register unsigned enc; +{ + switch (enc) + { + case DW_ATE_address: + return "DW_ATE_address"; + case DW_ATE_boolean: + return "DW_ATE_boolean"; + case DW_ATE_complex_float: + return "DW_ATE_complex_float"; + case DW_ATE_float: + return "DW_ATE_float"; + case DW_ATE_signed: + return "DW_ATE_signed"; + case DW_ATE_signed_char: + return "DW_ATE_signed_char"; + case DW_ATE_unsigned: + return "DW_ATE_unsigned"; + case DW_ATE_unsigned_char: + return "DW_ATE_unsigned_char"; + default: + return "DW_ATE_<unknown>"; + } +} + +/* Convert a DWARF call frame info operation to its string name. */ + +#if 0 +static char * +dwarf_cfi_name (cfi_opc) + register unsigned cfi_opc; +{ + switch (cfi_opc) + { + case DW_CFA_advance_loc: + return "DW_CFA_advance_loc"; + case DW_CFA_offset: + return "DW_CFA_offset"; + case DW_CFA_restore: + return "DW_CFA_restore"; + case DW_CFA_nop: + return "DW_CFA_nop"; + case DW_CFA_set_loc: + return "DW_CFA_set_loc"; + case DW_CFA_advance_loc1: + return "DW_CFA_advance_loc1"; + case DW_CFA_advance_loc2: + return "DW_CFA_advance_loc2"; + case DW_CFA_advance_loc4: + return "DW_CFA_advance_loc4"; + case DW_CFA_offset_extended: + return "DW_CFA_offset_extended"; + case DW_CFA_restore_extended: + return "DW_CFA_restore_extended"; + case DW_CFA_undefined: + return "DW_CFA_undefined"; + case DW_CFA_same_value: + return "DW_CFA_same_value"; + case DW_CFA_register: + return "DW_CFA_register"; + case DW_CFA_remember_state: + return "DW_CFA_remember_state"; + case DW_CFA_restore_state: + return "DW_CFA_restore_state"; + case DW_CFA_def_cfa: + return "DW_CFA_def_cfa"; + case DW_CFA_def_cfa_register: + return "DW_CFA_def_cfa_register"; + case DW_CFA_def_cfa_offset: + return "DW_CFA_def_cfa_offset"; + /* SGI/MIPS specific */ + case DW_CFA_MIPS_advance_loc8: + return "DW_CFA_MIPS_advance_loc8"; + default: + return "DW_CFA_<unknown>"; + } +} +#endif + +void +dump_die (die) + struct die_info *die; +{ + unsigned int i; + + fprintf (stderr, "Die: %s (abbrev = %d, offset = %d)\n", + dwarf_tag_name (die->tag), die->abbrev, die->offset); + fprintf (stderr, "\thas children: %s\n", + dwarf_bool_name (die->has_children)); + + fprintf (stderr, "\tattributes:\n"); + for (i = 0; i < die->num_attrs; ++i) + { + fprintf (stderr, "\t\t%s (%s) ", + dwarf_attr_name (die->attrs[i].name), + dwarf_form_name (die->attrs[i].form)); + switch (die->attrs[i].form) + { + case DW_FORM_ref_addr: + case DW_FORM_addr: + fprintf (stderr, "address: "); + print_address_numeric (DW_ADDR (&die->attrs[i]), 1, gdb_stderr); + break; + case DW_FORM_block2: + case DW_FORM_block4: + case DW_FORM_block: + case DW_FORM_block1: + fprintf (stderr, "block: size %d", DW_BLOCK (&die->attrs[i])->size); + break; + case DW_FORM_data1: + case DW_FORM_data2: + case DW_FORM_data4: + case DW_FORM_ref1: + case DW_FORM_ref2: + case DW_FORM_ref4: + case DW_FORM_udata: + case DW_FORM_sdata: + fprintf (stderr, "constant: %d", DW_UNSND (&die->attrs[i])); + break; + case DW_FORM_string: + fprintf (stderr, "string: \"%s\"", + DW_STRING (&die->attrs[i]) + ? DW_STRING (&die->attrs[i]) : ""); + break; + case DW_FORM_flag: + if (DW_UNSND (&die->attrs[i])) + fprintf (stderr, "flag: TRUE"); + else + fprintf (stderr, "flag: FALSE"); + break; + case DW_FORM_strp: /* we do not support separate string + section yet */ + case DW_FORM_indirect: /* we do not handle indirect yet */ + case DW_FORM_data8: /* we do not have 64 bit quantities */ + default: + fprintf (stderr, "unsupported attribute form: %d.", + die->attrs[i].form); + } + fprintf (stderr, "\n"); + } +} + +void +dump_die_list (die) + struct die_info *die; +{ + while (die) + { + dump_die (die); + die = die->next; + } +} + +void +store_in_ref_table (offset, die) + unsigned int offset; + struct die_info *die; +{ + int h; + struct die_info *old; + + h = (offset % REF_HASH_SIZE); + old = die_ref_table[h]; + die->next_ref = old; + die_ref_table[h] = die; +} + + +static void +dwarf2_empty_die_ref_table () +{ + memset (die_ref_table, 0, sizeof (die_ref_table)); +} + +static unsigned int +dwarf2_get_ref_die_offset (attr) + struct attribute *attr; +{ + unsigned int result = 0; + + switch (attr->form) + { + case DW_FORM_ref_addr: + result = DW_ADDR (attr); + break; + case DW_FORM_ref1: + case DW_FORM_ref2: + case DW_FORM_ref4: + case DW_FORM_ref_udata: + result = cu_header_offset + DW_UNSND (attr); + break; + default: + complain (&dwarf2_unsupported_die_ref_attr, dwarf_form_name (attr->form)); + } + return result; +} + +struct die_info * +follow_die_ref (offset) + unsigned int offset; +{ + struct die_info *die; + int h; + + h = (offset % REF_HASH_SIZE); + die = die_ref_table[h]; + while (die) + { + if (die->offset == offset) + { + return die; + } + die = die->next_ref; + } + return NULL; +} + +static struct type * +dwarf2_fundamental_type (objfile, typeid) + struct objfile *objfile; + int typeid; +{ + if (typeid < 0 || typeid >= FT_NUM_MEMBERS) + { + error ("Dwarf Error: internal error - invalid fundamental type id %d.", + typeid); + } + + /* Look for this particular type in the fundamental type vector. If + one is not found, create and install one appropriate for the + current language and the current target machine. */ + + if (ftypes[typeid] == NULL) + { + ftypes[typeid] = cu_language_defn->la_fund_type (objfile, typeid); + } + + return (ftypes[typeid]); +} + +/* Decode simple location descriptions. + Given a pointer to a dwarf block that defines a location, compute + the location and return the value. + + FIXME: This is a kludge until we figure out a better + way to handle the location descriptions. + Gdb's design does not mesh well with the DWARF2 notion of a location + computing interpreter, which is a shame because the flexibility goes unused. + FIXME: Implement more operations as necessary. + + A location description containing no operations indicates that the + object is optimized out. The global optimized_out flag is set for + those, the return value is meaningless. + + When the result is a register number, the global isreg flag is set, + otherwise it is cleared. + + When the result is a base register offset, the global offreg flag is set + and the register number is returned in basereg, otherwise it is cleared. + + When the DW_OP_fbreg operation is encountered without a corresponding + DW_AT_frame_base attribute, the global islocal flag is set. + Hopefully the machine dependent code knows how to set up a virtual + frame pointer for the local references. + + Note that stack[0] is unused except as a default error return. + Note that stack overflow is not yet handled. */ + +static CORE_ADDR +decode_locdesc (blk, objfile) + struct dwarf_block *blk; + struct objfile *objfile; +{ + int i; + int size = blk->size; + char *data = blk->data; + CORE_ADDR stack[64]; + int stacki; + unsigned int bytes_read, unsnd; + unsigned char op; + + i = 0; + stacki = 0; + stack[stacki] = 0; + isreg = 0; + offreg = 0; + islocal = 0; + optimized_out = 1; + + while (i < size) + { + optimized_out = 0; + op = data[i++]; + switch (op) + { + case DW_OP_reg0: + case DW_OP_reg1: + case DW_OP_reg2: + case DW_OP_reg3: + case DW_OP_reg4: + case DW_OP_reg5: + case DW_OP_reg6: + case DW_OP_reg7: + case DW_OP_reg8: + case DW_OP_reg9: + case DW_OP_reg10: + case DW_OP_reg11: + case DW_OP_reg12: + case DW_OP_reg13: + case DW_OP_reg14: + case DW_OP_reg15: + case DW_OP_reg16: + case DW_OP_reg17: + case DW_OP_reg18: + case DW_OP_reg19: + case DW_OP_reg20: + case DW_OP_reg21: + case DW_OP_reg22: + case DW_OP_reg23: + case DW_OP_reg24: + case DW_OP_reg25: + case DW_OP_reg26: + case DW_OP_reg27: + case DW_OP_reg28: + case DW_OP_reg29: + case DW_OP_reg30: + case DW_OP_reg31: + isreg = 1; + stack[++stacki] = op - DW_OP_reg0; + break; + + case DW_OP_regx: + isreg = 1; + unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read); + i += bytes_read; +#if defined(HARRIS_TARGET) && defined(_M88K) + /* The Harris 88110 gdb ports have long kept their special reg + numbers between their gp-regs and their x-regs. This is + not how our dwarf is generated. Punt. */ + unsnd += 6; +#endif + stack[++stacki] = unsnd; + break; + + case DW_OP_breg0: + case DW_OP_breg1: + case DW_OP_breg2: + case DW_OP_breg3: + case DW_OP_breg4: + case DW_OP_breg5: + case DW_OP_breg6: + case DW_OP_breg7: + case DW_OP_breg8: + case DW_OP_breg9: + case DW_OP_breg10: + case DW_OP_breg11: + case DW_OP_breg12: + case DW_OP_breg13: + case DW_OP_breg14: + case DW_OP_breg15: + case DW_OP_breg16: + case DW_OP_breg17: + case DW_OP_breg18: + case DW_OP_breg19: + case DW_OP_breg20: + case DW_OP_breg21: + case DW_OP_breg22: + case DW_OP_breg23: + case DW_OP_breg24: + case DW_OP_breg25: + case DW_OP_breg26: + case DW_OP_breg27: + case DW_OP_breg28: + case DW_OP_breg29: + case DW_OP_breg30: + case DW_OP_breg31: + offreg = 1; + basereg = op - DW_OP_breg0; + stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read); + i += bytes_read; + break; + + case DW_OP_fbreg: + stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read); + i += bytes_read; + if (frame_base_reg >= 0) + { + offreg = 1; + basereg = frame_base_reg; + stack[stacki] += frame_base_offset; + } + else + { + complain (&dwarf2_missing_at_frame_base); + islocal = 1; + } + break; + + case DW_OP_addr: + stack[++stacki] = read_address (objfile->obfd, &data[i]); + i += address_size; + break; + + case DW_OP_const1u: + stack[++stacki] = read_1_byte (objfile->obfd, &data[i]); + i += 1; + break; + + case DW_OP_const1s: + stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]); + i += 1; + break; + + case DW_OP_const2u: + stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]); + i += 2; + break; + + case DW_OP_const2s: + stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]); + i += 2; + break; + + case DW_OP_const4u: + stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]); + i += 4; + break; + + case DW_OP_const4s: + stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]); + i += 4; + break; + + case DW_OP_constu: + stack[++stacki] = read_unsigned_leb128 (NULL, (data + i), + &bytes_read); + i += bytes_read; + break; + + case DW_OP_consts: + stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read); + i += bytes_read; + break; + + case DW_OP_plus: + stack[stacki - 1] += stack[stacki]; + stacki--; + break; + + case DW_OP_plus_uconst: + stack[stacki] += read_unsigned_leb128 (NULL, (data + i), &bytes_read); + i += bytes_read; + break; + + case DW_OP_minus: + stack[stacki - 1] = stack[stacki] - stack[stacki - 1]; + stacki--; + break; + + default: + complain (&dwarf2_unsupported_stack_op, dwarf_stack_op_name(op)); + return (stack[stacki]); + } + } + return (stack[stacki]); +} + +/* memory allocation interface */ + +/* ARGSUSED */ +static void +dwarf2_free_tmp_obstack (ignore) + PTR ignore; +{ + obstack_free (&dwarf2_tmp_obstack, NULL); +} + +static struct dwarf_block * +dwarf_alloc_block () +{ + struct dwarf_block *blk; + + blk = (struct dwarf_block *) + obstack_alloc (&dwarf2_tmp_obstack, sizeof (struct dwarf_block)); + return (blk); +} + +static struct abbrev_info * +dwarf_alloc_abbrev () +{ + struct abbrev_info *abbrev; + + abbrev = (struct abbrev_info *) xmalloc (sizeof (struct abbrev_info)); + memset (abbrev, 0, sizeof (struct abbrev_info)); + return (abbrev); +} + +static struct die_info * +dwarf_alloc_die () +{ + struct die_info *die; + + die = (struct die_info *) xmalloc (sizeof (struct die_info)); + memset (die, 0, sizeof (struct die_info)); + return (die); +} |