diff options
Diffstat (limited to 'libdw/dwarf_getsrclines.c')
| -rw-r--r-- | libdw/dwarf_getsrclines.c | 1275 |
1 files changed, 677 insertions, 598 deletions
diff --git a/libdw/dwarf_getsrclines.c b/libdw/dwarf_getsrclines.c index 74d626cf..1f460ec2 100644 --- a/libdw/dwarf_getsrclines.c +++ b/libdw/dwarf_getsrclines.c @@ -34,6 +34,8 @@ #include <assert.h> #include <stdlib.h> #include <string.h> +#include <search.h> + #include "dwarf.h" #include "libdwP.h" @@ -65,14 +67,12 @@ compare_lines (const void *a, const void *b) return (*p1)->addr - (*p2)->addr; } -int -dwarf_getsrclines (Dwarf_Die *cudie, Dwarf_Lines **lines, size_t *nlines) +static int +read_srclines (Dwarf *dbg, + const unsigned char *linep, const unsigned char *lineendp, + const char *comp_dir, unsigned address_size, + Dwarf_Lines **linesp, Dwarf_Files **filesp) { - if (unlikely (cudie == NULL - || (INTUSE(dwarf_tag) (cudie) != DW_TAG_compile_unit - && INTUSE(dwarf_tag) (cudie) != DW_TAG_partial_unit))) - return -1; - int res = -1; struct linelist *linelist = NULL; @@ -84,329 +84,428 @@ dwarf_getsrclines (Dwarf_Die *cudie, Dwarf_Lines **lines, size_t *nlines) #define MAX_STACK_ALLOC 4096 struct linelist *malloc_linelist = NULL; - /* Get the information if it is not already known. */ - struct Dwarf_CU *const cu = cudie->cu; - if (cu->lines == NULL) + if (unlikely (linep + 4 > lineendp)) { - /* Failsafe mode: no data found. */ - cu->lines = (void *) -1l; - cu->files = (void *) -1l; - - /* The die must have a statement list associated. */ - Dwarf_Attribute stmt_list_mem; - Dwarf_Attribute *stmt_list = INTUSE(dwarf_attr) (cudie, DW_AT_stmt_list, - &stmt_list_mem); - - /* Get the offset into the .debug_line section. NB: this call - also checks whether the previous dwarf_attr call failed. */ - const unsigned char *lineendp; - const unsigned char *linep - = __libdw_formptr (stmt_list, IDX_debug_line, DWARF_E_NO_DEBUG_LINE, - (unsigned char **) &lineendp, NULL); - if (linep == NULL) - goto out; - - /* Get the compilation directory. */ - Dwarf_Attribute compdir_attr_mem; - Dwarf_Attribute *compdir_attr = INTUSE(dwarf_attr) (cudie, - DW_AT_comp_dir, - &compdir_attr_mem); - const char *comp_dir = INTUSE(dwarf_formstring) (compdir_attr); - - if (unlikely (linep + 4 > lineendp)) - { - invalid_data: - __libdw_seterrno (DWARF_E_INVALID_DEBUG_LINE); - goto out; - } - - Dwarf *dbg = cu->dbg; - Dwarf_Word unit_length = read_4ubyte_unaligned_inc (dbg, linep); - unsigned int length = 4; - if (unlikely (unit_length == DWARF3_LENGTH_64_BIT)) - { - if (unlikely (linep + 8 > lineendp)) - goto invalid_data; - unit_length = read_8ubyte_unaligned_inc (dbg, linep); - length = 8; - } + invalid_data: + __libdw_seterrno (DWARF_E_INVALID_DEBUG_LINE); + goto out; + } - /* Check whether we have enough room in the section. */ - if (unit_length < 2 + length + 5 * 1 - || unlikely (linep + unit_length > lineendp)) + Dwarf_Word unit_length = read_4ubyte_unaligned_inc (dbg, linep); + unsigned int length = 4; + if (unlikely (unit_length == DWARF3_LENGTH_64_BIT)) + { + if (unlikely (linep + 8 > lineendp)) goto invalid_data; - lineendp = linep + unit_length; + unit_length = read_8ubyte_unaligned_inc (dbg, linep); + length = 8; + } - /* The next element of the header is the version identifier. */ - uint_fast16_t version = read_2ubyte_unaligned_inc (dbg, linep); - if (unlikely (version < 2) || unlikely (version > 4)) - { - __libdw_seterrno (DWARF_E_VERSION); - goto out; - } + /* Check whether we have enough room in the section. */ + if (unit_length < 2 + length + 5 * 1 + || unlikely (linep + unit_length > lineendp)) + goto invalid_data; + lineendp = linep + unit_length; - /* Next comes the header length. */ - Dwarf_Word header_length; - if (length == 4) - header_length = read_4ubyte_unaligned_inc (dbg, linep); - else - header_length = read_8ubyte_unaligned_inc (dbg, linep); - const unsigned char *header_start = linep; + /* The next element of the header is the version identifier. */ + uint_fast16_t version = read_2ubyte_unaligned_inc (dbg, linep); + if (unlikely (version < 2) || unlikely (version > 4)) + { + __libdw_seterrno (DWARF_E_VERSION); + goto out; + } - /* Next the minimum instruction length. */ - uint_fast8_t minimum_instr_len = *linep++; + /* Next comes the header length. */ + Dwarf_Word header_length; + if (length == 4) + header_length = read_4ubyte_unaligned_inc (dbg, linep); + else + header_length = read_8ubyte_unaligned_inc (dbg, linep); + const unsigned char *header_start = linep; - /* Next the maximum operations per instruction, in version 4 format. */ - uint_fast8_t max_ops_per_instr = 1; - if (version >= 4) - { - if (unlikely (lineendp - linep < 5)) - goto invalid_data; - max_ops_per_instr = *linep++; - if (unlikely (max_ops_per_instr == 0)) - goto invalid_data; - } + /* Next the minimum instruction length. */ + uint_fast8_t minimum_instr_len = *linep++; - /* Then the flag determining the default value of the is_stmt - register. */ - uint_fast8_t default_is_stmt = *linep++; + /* Next the maximum operations per instruction, in version 4 format. */ + uint_fast8_t max_ops_per_instr = 1; + if (version >= 4) + { + if (unlikely (lineendp - linep < 5)) + goto invalid_data; + max_ops_per_instr = *linep++; + if (unlikely (max_ops_per_instr == 0)) + goto invalid_data; + } - /* Now the line base. */ - int_fast8_t line_base = (int8_t) *linep++; + /* Then the flag determining the default value of the is_stmt + register. */ + uint_fast8_t default_is_stmt = *linep++; + + /* Now the line base. */ + int_fast8_t line_base = (int8_t) *linep++; + + /* And the line range. */ + uint_fast8_t line_range = *linep++; + + /* The opcode base. */ + uint_fast8_t opcode_base = *linep++; + + /* Remember array with the standard opcode length (-1 to account for + the opcode with value zero not being mentioned). */ + const uint8_t *standard_opcode_lengths = linep - 1; + if (unlikely (lineendp - linep < opcode_base - 1)) + goto invalid_data; + linep += opcode_base - 1; + + /* First comes the list of directories. Add the compilation + directory first since the index zero is used for it. */ + struct dirlist + { + const char *dir; + size_t len; + struct dirlist *next; + } comp_dir_elem = + { + .dir = comp_dir, + .len = comp_dir ? strlen (comp_dir) : 0, + .next = NULL + }; + struct dirlist *dirlist = &comp_dir_elem; + unsigned int ndirlist = 1; + + // XXX Directly construct array to conserve memory? + while (*linep != 0) + { + struct dirlist *new_dir = + (struct dirlist *) alloca (sizeof (*new_dir)); - /* And the line range. */ - uint_fast8_t line_range = *linep++; + new_dir->dir = (char *) linep; + uint8_t *endp = memchr (linep, '\0', lineendp - linep); + if (endp == NULL) + goto invalid_data; + new_dir->len = endp - linep; + new_dir->next = dirlist; + dirlist = new_dir; + ++ndirlist; + linep = endp + 1; + } + /* Skip the final NUL byte. */ + ++linep; - /* The opcode base. */ - uint_fast8_t opcode_base = *linep++; + /* Rearrange the list in array form. */ + struct dirlist **dirarray + = (struct dirlist **) alloca (ndirlist * sizeof (*dirarray)); + for (unsigned int n = ndirlist; n-- > 0; dirlist = dirlist->next) + dirarray[n] = dirlist; - /* Remember array with the standard opcode length (-1 to account for - the opcode with value zero not being mentioned). */ - const uint8_t *standard_opcode_lengths = linep - 1; - if (unlikely (lineendp - linep < opcode_base - 1)) + /* Now read the files. */ + struct filelist null_file = + { + .info = + { + .name = "???", + .mtime = 0, + .length = 0 + }, + .next = NULL + }; + struct filelist *filelist = &null_file; + unsigned int nfilelist = 1; + + if (unlikely (linep >= lineendp)) + goto invalid_data; + while (*linep != 0) + { + struct filelist *new_file = + (struct filelist *) alloca (sizeof (*new_file)); + + /* First comes the file name. */ + char *fname = (char *) linep; + uint8_t *endp = memchr (fname, '\0', lineendp - linep); + if (endp == NULL) goto invalid_data; - linep += opcode_base - 1; + size_t fnamelen = endp - (uint8_t *) fname; + linep = endp + 1; - /* First comes the list of directories. Add the compilation - directory first since the index zero is used for it. */ - struct dirlist - { - const char *dir; - size_t len; - struct dirlist *next; - } comp_dir_elem = - { - .dir = comp_dir, - .len = comp_dir ? strlen (comp_dir) : 0, - .next = NULL - }; - struct dirlist *dirlist = &comp_dir_elem; - unsigned int ndirlist = 1; - - // XXX Directly construct array to conserve memory? - while (*linep != 0) + /* Then the index. */ + Dwarf_Word diridx; + get_uleb128 (diridx, linep); + if (unlikely (diridx >= ndirlist)) { - struct dirlist *new_dir = - (struct dirlist *) alloca (sizeof (*new_dir)); - - new_dir->dir = (char *) linep; - uint8_t *endp = memchr (linep, '\0', lineendp - linep); - if (endp == NULL) - goto invalid_data; - new_dir->len = endp - linep; - new_dir->next = dirlist; - dirlist = new_dir; - ++ndirlist; - linep = endp + 1; + __libdw_seterrno (DWARF_E_INVALID_DIR_IDX); + goto out; } - /* Skip the final NUL byte. */ - ++linep; - /* Rearrange the list in array form. */ - struct dirlist **dirarray - = (struct dirlist **) alloca (ndirlist * sizeof (*dirarray)); - for (unsigned int n = ndirlist; n-- > 0; dirlist = dirlist->next) - dirarray[n] = dirlist; - - /* Now read the files. */ - struct filelist null_file = - { - .info = - { - .name = "???", - .mtime = 0, - .length = 0 - }, - .next = NULL - }; - struct filelist *filelist = &null_file; - unsigned int nfilelist = 1; - - if (unlikely (linep >= lineendp)) - goto invalid_data; - while (*linep != 0) + if (*fname == '/') + /* It's an absolute path. */ + new_file->info.name = fname; + else { - struct filelist *new_file = - (struct filelist *) alloca (sizeof (*new_file)); - - /* First comes the file name. */ - char *fname = (char *) linep; - uint8_t *endp = memchr (fname, '\0', lineendp - linep); - if (endp == NULL) - goto invalid_data; - size_t fnamelen = endp - (uint8_t *) fname; - linep = endp + 1; + new_file->info.name = libdw_alloc (dbg, char, 1, + dirarray[diridx]->len + 1 + + fnamelen + 1); + char *cp = new_file->info.name; - /* Then the index. */ - Dwarf_Word diridx; - get_uleb128 (diridx, linep); - if (unlikely (diridx >= ndirlist)) + if (dirarray[diridx]->dir != NULL) { - __libdw_seterrno (DWARF_E_INVALID_DIR_IDX); - goto out; + /* This value could be NULL in case the DW_AT_comp_dir + was not present. We cannot do much in this case. + The easiest thing is to convert the path in an + absolute path. */ + cp = stpcpy (cp, dirarray[diridx]->dir); } - - if (*fname == '/') - /* It's an absolute path. */ - new_file->info.name = fname; - else - { - new_file->info.name = libdw_alloc (dbg, char, 1, - dirarray[diridx]->len + 1 - + fnamelen + 1); - char *cp = new_file->info.name; - - if (dirarray[diridx]->dir != NULL) - { - /* This value could be NULL in case the DW_AT_comp_dir - was not present. We cannot do much in this case. - The easiest thing is to convert the path in an - absolute path. */ - cp = stpcpy (cp, dirarray[diridx]->dir); - } - *cp++ = '/'; - strcpy (cp, fname); - assert (strlen (new_file->info.name) - < dirarray[diridx]->len + 1 + fnamelen + 1); - } - - /* Next comes the modification time. */ - get_uleb128 (new_file->info.mtime, linep); - - /* Finally the length of the file. */ - get_uleb128 (new_file->info.length, linep); - - new_file->next = filelist; - filelist = new_file; - ++nfilelist; + *cp++ = '/'; + strcpy (cp, fname); + assert (strlen (new_file->info.name) + < dirarray[diridx]->len + 1 + fnamelen + 1); } - /* Skip the final NUL byte. */ - ++linep; - /* Consistency check. */ - if (unlikely (linep != header_start + header_length)) - { - __libdw_seterrno (DWARF_E_INVALID_DWARF); - goto out; - } + /* Next comes the modification time. */ + get_uleb128 (new_file->info.mtime, linep); - /* We are about to process the statement program. Initialize the - state machine registers (see 6.2.2 in the v2.1 specification). */ - Dwarf_Word addr = 0; - unsigned int op_index = 0; - unsigned int file = 1; - int line = 1; - unsigned int column = 0; - uint_fast8_t is_stmt = default_is_stmt; - bool basic_block = false; - bool prologue_end = false; - bool epilogue_begin = false; - unsigned int isa = 0; - unsigned int discriminator = 0; - - /* Apply the "operation advance" from a special opcode - or DW_LNS_advance_pc (as per DWARF4 6.2.5.1). */ - inline void advance_pc (unsigned int op_advance) - { - addr += minimum_instr_len * ((op_index + op_advance) - / max_ops_per_instr); - op_index = (op_index + op_advance) % max_ops_per_instr; - } + /* Finally the length of the file. */ + get_uleb128 (new_file->info.length, linep); - /* Process the instructions. */ + new_file->next = filelist; + filelist = new_file; + ++nfilelist; + } + /* Skip the final NUL byte. */ + ++linep; - /* Adds a new line to the matrix. - We cannot simply define a function because we want to use alloca. */ + /* Consistency check. */ + if (unlikely (linep != header_start + header_length)) + { + __libdw_seterrno (DWARF_E_INVALID_DWARF); + goto out; + } + + /* We are about to process the statement program. Initialize the + state machine registers (see 6.2.2 in the v2.1 specification). */ + Dwarf_Word addr = 0; + unsigned int op_index = 0; + unsigned int file = 1; + int line = 1; + unsigned int column = 0; + uint_fast8_t is_stmt = default_is_stmt; + bool basic_block = false; + bool prologue_end = false; + bool epilogue_begin = false; + unsigned int isa = 0; + unsigned int discriminator = 0; + + /* Apply the "operation advance" from a special opcode or + DW_LNS_advance_pc (as per DWARF4 6.2.5.1). */ + inline void advance_pc (unsigned int op_advance) + { + addr += minimum_instr_len * ((op_index + op_advance) + / max_ops_per_instr); + op_index = (op_index + op_advance) % max_ops_per_instr; + } + + /* Process the instructions. */ + + /* Adds a new line to the matrix. + We cannot simply define a function because we want to use alloca. */ #define NEW_LINE(end_seq) \ - do { \ - struct linelist *ll = (nlinelist < MAX_STACK_ALLOC \ - ? alloca (sizeof (struct linelist)) \ - : malloc (sizeof (struct linelist))); \ - if (nlinelist >= MAX_STACK_ALLOC) \ - malloc_linelist = ll; \ - if (unlikely (add_new_line (ll, end_seq))) \ - goto invalid_data; \ - } while (0) - - inline bool add_new_line (struct linelist *new_line, bool end_sequence) - { - new_line->next = linelist; - linelist = new_line; - ++nlinelist; - - /* Set the line information. For some fields we use bitfields, - so we would lose information if the encoded values are too large. - Check just for paranoia, and call the data "invalid" if it - violates our assumptions on reasonable limits for the values. */ + do { \ + struct linelist *ll = (nlinelist < MAX_STACK_ALLOC \ + ? alloca (sizeof (struct linelist)) \ + : malloc (sizeof (struct linelist))); \ + if (nlinelist >= MAX_STACK_ALLOC) \ + malloc_linelist = ll; \ + if (unlikely (add_new_line (ll, end_seq))) \ + goto invalid_data; \ + } while (0) + + inline bool add_new_line (struct linelist *new_line, bool end_sequence) + { + new_line->next = linelist; + linelist = new_line; + ++nlinelist; + + /* Set the line information. For some fields we use bitfields, + so we would lose information if the encoded values are too large. + Check just for paranoia, and call the data "invalid" if it + violates our assumptions on reasonable limits for the values. */ #define SET(field) \ - do { \ - new_line->line.field = field; \ - if (unlikely (new_line->line.field != field)) \ - return true; \ - } while (0) - - SET (addr); - SET (op_index); - SET (file); - SET (line); - SET (column); - SET (is_stmt); - SET (basic_block); - SET (end_sequence); - SET (prologue_end); - SET (epilogue_begin); - SET (isa); - SET (discriminator); + do { \ + new_line->line.field = field; \ + if (unlikely (new_line->line.field != field)) \ + return true; \ + } while (0) + + SET (addr); + SET (op_index); + SET (file); + SET (line); + SET (column); + SET (is_stmt); + SET (basic_block); + SET (end_sequence); + SET (prologue_end); + SET (epilogue_begin); + SET (isa); + SET (discriminator); #undef SET - return false; - } + return false; + } + + while (linep < lineendp) + { + unsigned int opcode; + unsigned int u128; + int s128; + + /* Read the opcode. */ + opcode = *linep++; - while (linep < lineendp) + /* Is this a special opcode? */ + if (likely (opcode >= opcode_base)) + { + /* Yes. Handling this is quite easy since the opcode value + is computed with + + opcode = (desired line increment - line_base) + + (line_range * address advance) + opcode_base + */ + int line_increment = (line_base + + (opcode - opcode_base) % line_range); + + /* Perform the increments. */ + line += line_increment; + advance_pc ((opcode - opcode_base) / line_range); + + /* Add a new line with the current state machine values. */ + NEW_LINE (0); + + /* Reset the flags. */ + basic_block = false; + prologue_end = false; + epilogue_begin = false; + discriminator = 0; + } + else if (opcode == 0) { - unsigned int opcode; - unsigned int u128; - int s128; + /* This an extended opcode. */ + if (unlikely (lineendp - linep < 2)) + goto invalid_data; + + /* The length. */ + uint_fast8_t len = *linep++; + + if (unlikely ((size_t) (lineendp - linep) < len)) + goto invalid_data; - /* Read the opcode. */ + /* The sub-opcode. */ opcode = *linep++; - /* Is this a special opcode? */ - if (likely (opcode >= opcode_base)) + switch (opcode) { - /* Yes. Handling this is quite easy since the opcode value - is computed with + case DW_LNE_end_sequence: + /* Add a new line with the current state machine values. + The is the end of the sequence. */ + NEW_LINE (1); + + /* Reset the registers. */ + addr = 0; + op_index = 0; + file = 1; + line = 1; + column = 0; + is_stmt = default_is_stmt; + basic_block = false; + prologue_end = false; + epilogue_begin = false; + isa = 0; + discriminator = 0; + break; + + case DW_LNE_set_address: + /* The value is an address. The size is defined as + apporiate for the target machine. We use the + address size field from the CU header. */ + op_index = 0; + if (unlikely (lineendp - linep < address_size)) + goto invalid_data; + if (__libdw_read_address_inc (dbg, IDX_debug_line, &linep, + address_size, &addr)) + goto out; + break; + + case DW_LNE_define_file: + { + char *fname = (char *) linep; + uint8_t *endp = memchr (linep, '\0', lineendp - linep); + if (endp == NULL) + goto invalid_data; + size_t fnamelen = endp - linep; + linep = endp + 1; + + unsigned int diridx; + get_uleb128 (diridx, linep); + Dwarf_Word mtime; + get_uleb128 (mtime, linep); + Dwarf_Word filelength; + get_uleb128 (filelength, linep); + + struct filelist *new_file = + (struct filelist *) alloca (sizeof (*new_file)); + if (fname[0] == '/') + new_file->info.name = fname; + else + { + new_file->info.name = + libdw_alloc (dbg, char, 1, (dirarray[diridx]->len + 1 + + fnamelen + 1)); + char *cp = new_file->info.name; + + if (dirarray[diridx]->dir != NULL) + /* This value could be NULL in case the + DW_AT_comp_dir was not present. We + cannot do much in this case. The easiest + thing is to convert the path in an + absolute path. */ + cp = stpcpy (cp, dirarray[diridx]->dir); + *cp++ = '/'; + strcpy (cp, fname); + } - opcode = (desired line increment - line_base) - + (line_range * address advance) + opcode_base - */ - int line_increment = (line_base - + (opcode - opcode_base) % line_range); + new_file->info.mtime = mtime; + new_file->info.length = filelength; + new_file->next = filelist; + filelist = new_file; + ++nfilelist; + } + break; + + case DW_LNE_set_discriminator: + /* Takes one ULEB128 parameter, the discriminator. */ + if (unlikely (standard_opcode_lengths[opcode] != 1)) + goto invalid_data; - /* Perform the increments. */ - line += line_increment; - advance_pc ((opcode - opcode_base) / line_range); + get_uleb128 (discriminator, linep); + break; + + default: + /* Unknown, ignore it. */ + if (unlikely ((size_t) (lineendp - (linep - 1)) < len)) + goto invalid_data; + linep += len - 1; + break; + } + } + else if (opcode <= DW_LNS_set_isa) + { + /* This is a known standard opcode. */ + switch (opcode) + { + case DW_LNS_copy: + /* Takes no argument. */ + if (unlikely (standard_opcode_lengths[opcode] != 0)) + goto invalid_data; /* Add a new line with the current state machine values. */ NEW_LINE (0); @@ -416,330 +515,195 @@ dwarf_getsrclines (Dwarf_Die *cudie, Dwarf_Lines **lines, size_t *nlines) prologue_end = false; epilogue_begin = false; discriminator = 0; - } - else if (opcode == 0) - { - /* This an extended opcode. */ - if (unlikely (lineendp - linep < 2)) + break; + + case DW_LNS_advance_pc: + /* Takes one uleb128 parameter which is added to the + address. */ + if (unlikely (standard_opcode_lengths[opcode] != 1)) goto invalid_data; - /* The length. */ - uint_fast8_t len = *linep++; + get_uleb128 (u128, linep); + advance_pc (u128); + break; - if (unlikely ((size_t) (lineendp - linep) < len)) + case DW_LNS_advance_line: + /* Takes one sleb128 parameter which is added to the + line. */ + if (unlikely (standard_opcode_lengths[opcode] != 1)) goto invalid_data; - /* The sub-opcode. */ - opcode = *linep++; - - switch (opcode) - { - case DW_LNE_end_sequence: - /* Add a new line with the current state machine values. - The is the end of the sequence. */ - NEW_LINE (1); - - /* Reset the registers. */ - addr = 0; - op_index = 0; - file = 1; - line = 1; - column = 0; - is_stmt = default_is_stmt; - basic_block = false; - prologue_end = false; - epilogue_begin = false; - isa = 0; - discriminator = 0; - break; - - case DW_LNE_set_address: - /* The value is an address. The size is defined as - apporiate for the target machine. We use the - address size field from the CU header. */ - op_index = 0; - if (unlikely (lineendp - linep < cu->address_size)) - goto invalid_data; - if (__libdw_read_address_inc (dbg, IDX_debug_line, &linep, - cu->address_size, &addr)) - goto out; - break; - - case DW_LNE_define_file: - { - char *fname = (char *) linep; - uint8_t *endp = memchr (linep, '\0', lineendp - linep); - if (endp == NULL) - goto invalid_data; - size_t fnamelen = endp - linep; - linep = endp + 1; - - unsigned int diridx; - get_uleb128 (diridx, linep); - Dwarf_Word mtime; - get_uleb128 (mtime, linep); - Dwarf_Word filelength; - get_uleb128 (filelength, linep); - - struct filelist *new_file = - (struct filelist *) alloca (sizeof (*new_file)); - if (fname[0] == '/') - new_file->info.name = fname; - else - { - new_file->info.name = - libdw_alloc (dbg, char, 1, (dirarray[diridx]->len + 1 - + fnamelen + 1)); - char *cp = new_file->info.name; - - if (dirarray[diridx]->dir != NULL) - /* This value could be NULL in case the - DW_AT_comp_dir was not present. We - cannot do much in this case. The easiest - thing is to convert the path in an - absolute path. */ - cp = stpcpy (cp, dirarray[diridx]->dir); - *cp++ = '/'; - strcpy (cp, fname); - } - - new_file->info.mtime = mtime; - new_file->info.length = filelength; - new_file->next = filelist; - filelist = new_file; - ++nfilelist; - } - break; - - case DW_LNE_set_discriminator: - /* Takes one ULEB128 parameter, the discriminator. */ - if (unlikely (standard_opcode_lengths[opcode] != 1)) - goto invalid_data; - - get_uleb128 (discriminator, linep); - break; - - default: - /* Unknown, ignore it. */ - if (unlikely ((size_t) (lineendp - (linep - 1)) < len)) - goto invalid_data; - linep += len - 1; - break; - } - } - else if (opcode <= DW_LNS_set_isa) - { - /* This is a known standard opcode. */ - switch (opcode) - { - case DW_LNS_copy: - /* Takes no argument. */ - if (unlikely (standard_opcode_lengths[opcode] != 0)) - goto invalid_data; - - /* Add a new line with the current state machine values. */ - NEW_LINE (0); - - /* Reset the flags. */ - basic_block = false; - prologue_end = false; - epilogue_begin = false; - discriminator = 0; - break; - - case DW_LNS_advance_pc: - /* Takes one uleb128 parameter which is added to the - address. */ - if (unlikely (standard_opcode_lengths[opcode] != 1)) - goto invalid_data; - - get_uleb128 (u128, linep); - advance_pc (u128); - break; - - case DW_LNS_advance_line: - /* Takes one sleb128 parameter which is added to the - line. */ - if (unlikely (standard_opcode_lengths[opcode] != 1)) - goto invalid_data; - - get_sleb128 (s128, linep); - line += s128; - break; - - case DW_LNS_set_file: - /* Takes one uleb128 parameter which is stored in file. */ - if (unlikely (standard_opcode_lengths[opcode] != 1)) - goto invalid_data; - - get_uleb128 (u128, linep); - file = u128; - break; - - case DW_LNS_set_column: - /* Takes one uleb128 parameter which is stored in column. */ - if (unlikely (standard_opcode_lengths[opcode] != 1)) - goto invalid_data; - - get_uleb128 (u128, linep); - column = u128; - break; - - case DW_LNS_negate_stmt: - /* Takes no argument. */ - if (unlikely (standard_opcode_lengths[opcode] != 0)) - goto invalid_data; - - is_stmt = 1 - is_stmt; - break; - - case DW_LNS_set_basic_block: - /* Takes no argument. */ - if (unlikely (standard_opcode_lengths[opcode] != 0)) - goto invalid_data; - - basic_block = true; - break; - - case DW_LNS_const_add_pc: - /* Takes no argument. */ - if (unlikely (standard_opcode_lengths[opcode] != 0)) - goto invalid_data; - - advance_pc ((255 - opcode_base) / line_range); - break; - - case DW_LNS_fixed_advance_pc: - /* Takes one 16 bit parameter which is added to the - address. */ - if (unlikely (standard_opcode_lengths[opcode] != 1) - || unlikely (lineendp - linep < 2)) - goto invalid_data; - - addr += read_2ubyte_unaligned_inc (dbg, linep); - op_index = 0; - break; - - case DW_LNS_set_prologue_end: - /* Takes no argument. */ - if (unlikely (standard_opcode_lengths[opcode] != 0)) - goto invalid_data; - - prologue_end = true; - break; - - case DW_LNS_set_epilogue_begin: - /* Takes no argument. */ - if (unlikely (standard_opcode_lengths[opcode] != 0)) - goto invalid_data; - - epilogue_begin = true; - break; - - case DW_LNS_set_isa: - /* Takes one uleb128 parameter which is stored in isa. */ - if (unlikely (standard_opcode_lengths[opcode] != 1)) - goto invalid_data; - - get_uleb128 (isa, linep); - break; - } - } - else - { - /* This is a new opcode the generator but not we know about. - Read the parameters associated with it but then discard - everything. Read all the parameters for this opcode. */ - for (int n = standard_opcode_lengths[opcode]; n > 0; --n) - get_uleb128 (u128, linep); - - /* Next round, ignore this opcode. */ - continue; - } - } + get_sleb128 (s128, linep); + line += s128; + break; - /* Put all the files in an array. */ - Dwarf_Files *files = libdw_alloc (dbg, Dwarf_Files, - sizeof (Dwarf_Files) - + nfilelist * sizeof (Dwarf_Fileinfo) - + (ndirlist + 1) * sizeof (char *), - 1); - const char **dirs = (void *) &files->info[nfilelist]; + case DW_LNS_set_file: + /* Takes one uleb128 parameter which is stored in file. */ + if (unlikely (standard_opcode_lengths[opcode] != 1)) + goto invalid_data; - files->nfiles = nfilelist; - while (nfilelist-- > 0) - { - files->info[nfilelist] = filelist->info; - filelist = filelist->next; - } - assert (filelist == NULL); - - /* Put all the directory strings in an array. */ - files->ndirs = ndirlist; - for (unsigned int i = 0; i < ndirlist; ++i) - dirs[i] = dirarray[i]->dir; - dirs[ndirlist] = NULL; - - /* Make the file data structure available through the CU. */ - cu->files = files; - - void *buf = libdw_alloc (dbg, Dwarf_Lines, (sizeof (Dwarf_Lines) - + (sizeof (Dwarf_Line) - * nlinelist)), 1); - - /* First use the buffer for the pointers, and sort the entries. - We'll write the pointers in the end of the buffer, and then - copy into the buffer from the beginning so the overlap works. */ - assert (sizeof (Dwarf_Line) >= sizeof (Dwarf_Line *)); - Dwarf_Line **sortlines = (buf + sizeof (Dwarf_Lines) - + ((sizeof (Dwarf_Line) - - sizeof (Dwarf_Line *)) * nlinelist)); - - /* The list is in LIFO order and usually they come in clumps with - ascending addresses. So fill from the back to probably start with - runs already in order before we sort. */ - unsigned int i = nlinelist; - while (i-- > 0) - { - sortlines[i] = &linelist->line; - linelist = linelist->next; - } - assert (linelist == NULL); + get_uleb128 (u128, linep); + file = u128; + break; + + case DW_LNS_set_column: + /* Takes one uleb128 parameter which is stored in column. */ + if (unlikely (standard_opcode_lengths[opcode] != 1)) + goto invalid_data; + + get_uleb128 (u128, linep); + column = u128; + break; + + case DW_LNS_negate_stmt: + /* Takes no argument. */ + if (unlikely (standard_opcode_lengths[opcode] != 0)) + goto invalid_data; + + is_stmt = 1 - is_stmt; + break; + + case DW_LNS_set_basic_block: + /* Takes no argument. */ + if (unlikely (standard_opcode_lengths[opcode] != 0)) + goto invalid_data; + + basic_block = true; + break; + + case DW_LNS_const_add_pc: + /* Takes no argument. */ + if (unlikely (standard_opcode_lengths[opcode] != 0)) + goto invalid_data; + + advance_pc ((255 - opcode_base) / line_range); + break; + + case DW_LNS_fixed_advance_pc: + /* Takes one 16 bit parameter which is added to the + address. */ + if (unlikely (standard_opcode_lengths[opcode] != 1) + || unlikely (lineendp - linep < 2)) + goto invalid_data; - /* Sort by ascending address. */ - qsort (sortlines, nlinelist, sizeof sortlines[0], &compare_lines); + addr += read_2ubyte_unaligned_inc (dbg, linep); + op_index = 0; + break; - /* Now that they are sorted, put them in the final array. - The buffers overlap, so we've clobbered the early elements - of SORTLINES by the time we're reading the later ones. */ - cu->lines = buf; - cu->lines->nlines = nlinelist; - for (i = 0; i < nlinelist; ++i) + case DW_LNS_set_prologue_end: + /* Takes no argument. */ + if (unlikely (standard_opcode_lengths[opcode] != 0)) + goto invalid_data; + + prologue_end = true; + break; + + case DW_LNS_set_epilogue_begin: + /* Takes no argument. */ + if (unlikely (standard_opcode_lengths[opcode] != 0)) + goto invalid_data; + + epilogue_begin = true; + break; + + case DW_LNS_set_isa: + /* Takes one uleb128 parameter which is stored in isa. */ + if (unlikely (standard_opcode_lengths[opcode] != 1)) + goto invalid_data; + + get_uleb128 (isa, linep); + break; + } + } + else { - cu->lines->info[i] = *sortlines[i]; - cu->lines->info[i].files = files; + /* This is a new opcode the generator but not we know about. + Read the parameters associated with it but then discard + everything. Read all the parameters for this opcode. */ + for (int n = standard_opcode_lengths[opcode]; n > 0; --n) + get_uleb128 (u128, linep); + + /* Next round, ignore this opcode. */ + continue; } + } - /* Make sure the highest address for the CU is marked as end_sequence. - This is required by the DWARF spec, but some compilers forget and - dwfl_module_getsrc depends on it. */ - if (nlinelist > 0) - cu->lines->info[nlinelist - 1].end_sequence = 1; + /* Put all the files in an array. */ + Dwarf_Files *files = libdw_alloc (dbg, Dwarf_Files, + sizeof (Dwarf_Files) + + nfilelist * sizeof (Dwarf_Fileinfo) + + (ndirlist + 1) * sizeof (char *), + 1); + const char **dirs = (void *) &files->info[nfilelist]; - /* Success. */ - res = 0; + files->nfiles = nfilelist; + while (nfilelist-- > 0) + { + files->info[nfilelist] = filelist->info; + filelist = filelist->next; } - else if (cu->lines != (void *) -1l) - /* We already have the information. */ - res = 0; + assert (filelist == NULL); + + /* Put all the directory strings in an array. */ + files->ndirs = ndirlist; + for (unsigned int i = 0; i < ndirlist; ++i) + dirs[i] = dirarray[i]->dir; + dirs[ndirlist] = NULL; + + /* Pass the file data structure to the caller. */ + if (filesp != NULL) + *filesp = files; + + void *buf = libdw_alloc (dbg, Dwarf_Lines, (sizeof (Dwarf_Lines) + + (sizeof (Dwarf_Line) + * nlinelist)), 1); + + /* First use the buffer for the pointers, and sort the entries. + We'll write the pointers in the end of the buffer, and then + copy into the buffer from the beginning so the overlap works. */ + assert (sizeof (Dwarf_Line) >= sizeof (Dwarf_Line *)); + Dwarf_Line **sortlines = (buf + sizeof (Dwarf_Lines) + + ((sizeof (Dwarf_Line) + - sizeof (Dwarf_Line *)) * nlinelist)); + + /* The list is in LIFO order and usually they come in clumps with + ascending addresses. So fill from the back to probably start with + runs already in order before we sort. */ + for (unsigned int i = nlinelist; i-- > 0; ) + { + sortlines[i] = &linelist->line; + linelist = linelist->next; + } + assert (linelist == NULL); - if (likely (res == 0)) + /* Sort by ascending address. */ + qsort (sortlines, nlinelist, sizeof sortlines[0], &compare_lines); + + /* Now that they are sorted, put them in the final array. + The buffers overlap, so we've clobbered the early elements + of SORTLINES by the time we're reading the later ones. */ + Dwarf_Lines *lines = buf; + lines->nlines = nlinelist; + for (unsigned int i = 0; i < nlinelist; ++i) { - *lines = cu->lines; - *nlines = cu->lines->nlines; + lines->info[i] = *sortlines[i]; + lines->info[i].files = files; } - out: + /* Make sure the highest address for the CU is marked as end_sequence. + This is required by the DWARF spec, but some compilers forget and + dwfl_module_getsrc depends on it. */ + if (nlinelist > 0) + lines->info[nlinelist - 1].end_sequence = 1; + + /* Pass the line structure back to the caller. */ + if (linesp != NULL) + *linesp = lines; + + /* Success. */ + res = 0; + + out: /* Free malloced line records, if any. */ for (unsigned int i = MAX_STACK_ALLOC; i < nlinelist; i++) { @@ -748,8 +712,123 @@ dwarf_getsrclines (Dwarf_Die *cudie, Dwarf_Lines **lines, size_t *nlines) malloc_linelist = ll; } + return res; +} + +static int +files_lines_compare (const void *p1, const void *p2) +{ + const struct files_lines_s *t1 = p1; + const struct files_lines_s *t2 = p2; + + if (t1->debug_line_offset < t2->debug_line_offset) + return -1; + if (t1->debug_line_offset > t2->debug_line_offset) + return 1; + + return 0; +} + +int +__libdw_getsrclines (Dwarf *dbg, Dwarf_Off debug_line_offset, + const char *comp_dir, unsigned address_size, + Dwarf_Lines **linesp, Dwarf_Files **filesp) +{ + struct files_lines_s fake = { .debug_line_offset = debug_line_offset }; + struct files_lines_s **found = tfind (&fake, &dbg->files_lines, + files_lines_compare); + if (found == NULL) + { + Elf_Data *data = __libdw_checked_get_data (dbg, IDX_debug_line); + if (data == NULL + || __libdw_offset_in_section (dbg, IDX_debug_line, + debug_line_offset, 1) != 0) + return -1; + + const unsigned char *linep = data->d_buf + debug_line_offset; + const unsigned char *lineendp = data->d_buf + data->d_size; + + struct files_lines_s *node = libdw_alloc (dbg, struct files_lines_s, + sizeof *node, 1); + + if (read_srclines (dbg, linep, lineendp, comp_dir, address_size, + &node->lines, &node->files) != 0) + return -1; + + node->debug_line_offset = debug_line_offset; + + found = tsearch (node, &dbg->files_lines, files_lines_compare); + if (found == NULL) + { + __libdw_seterrno (DWARF_E_NOMEM); + return -1; + } + } + + if (linesp != NULL) + *linesp = (*found)->lines; + + if (filesp != NULL) + *filesp = (*found)->files; + + return 0; +} + +/* Get the compilation directory, if any is set. */ +const char * +__libdw_getcompdir (Dwarf_Die *cudie) +{ + if (cudie == NULL) + return NULL; + + Dwarf_Attribute compdir_attr_mem; + Dwarf_Attribute *compdir_attr = INTUSE(dwarf_attr) (cudie, + DW_AT_comp_dir, + &compdir_attr_mem); + return INTUSE(dwarf_formstring) (compdir_attr); +} + +int +dwarf_getsrclines (Dwarf_Die *cudie, Dwarf_Lines **lines, size_t *nlines) +{ + if (unlikely (cudie == NULL + || (INTUSE(dwarf_tag) (cudie) != DW_TAG_compile_unit + && INTUSE(dwarf_tag) (cudie) != DW_TAG_partial_unit))) + return -1; + + /* Get the information if it is not already known. */ + struct Dwarf_CU *const cu = cudie->cu; + if (cu->lines == NULL) + { + /* Failsafe mode: no data found. */ + cu->lines = (void *) -1l; + cu->files = (void *) -1l; + + /* The die must have a statement list associated. */ + Dwarf_Attribute stmt_list_mem; + Dwarf_Attribute *stmt_list = INTUSE(dwarf_attr) (cudie, DW_AT_stmt_list, + &stmt_list_mem); + + /* Get the offset into the .debug_line section. NB: this call + also checks whether the previous dwarf_attr call failed. */ + Dwarf_Off debug_line_offset; + if (__libdw_formptr (stmt_list, IDX_debug_line, DWARF_E_NO_DEBUG_LINE, + NULL, &debug_line_offset) == NULL) + return -1; + + if (__libdw_getsrclines (cu->dbg, debug_line_offset, + __libdw_getcompdir (cudie), + cu->address_size, &cu->lines, &cu->files) < 0) + return -1; + } + else if (cu->lines == (void *) -1l) + return -1; + + *lines = cu->lines; + *nlines = cu->lines->nlines; + // XXX Eventually: unlocking here. - return res; + return 0; } INTDEF(dwarf_getsrclines) |