/* Backend function setup Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc. Contributed by Paul Brook This file is part of GCC. GCC 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, or (at your option) any later version. GCC 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 GCC; see the file COPYING. If not, write to the Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ /* trans-decl.c -- Handling of backend function and variable decls, etc */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tree.h" #include "tree-dump.h" #include "tree-gimple.h" #include "ggc.h" #include "toplev.h" #include "tm.h" #include "target.h" #include "function.h" #include "flags.h" #include "cgraph.h" #include "gfortran.h" #include "trans.h" #include "trans-types.h" #include "trans-array.h" #include "trans-const.h" /* Only for gfc_trans_code. Shouldn't need to include this. */ #include "trans-stmt.h" #define MAX_LABEL_VALUE 99999 /* Holds the result of the function if no result variable specified. */ static GTY(()) tree current_fake_result_decl; static GTY(()) tree current_function_return_label; /* Holds the variable DECLs for the current function. */ static GTY(()) tree saved_function_decls = NULL_TREE; static GTY(()) tree saved_parent_function_decls = NULL_TREE; /* The namespace of the module we're currently generating. Only used while outputting decls for module variables. Do not rely on this being set. */ static gfc_namespace *module_namespace; /* List of static constructor functions. */ tree gfc_static_ctors; /* Function declarations for builtin library functions. */ tree gfor_fndecl_internal_malloc; tree gfor_fndecl_internal_malloc64; tree gfor_fndecl_internal_free; tree gfor_fndecl_allocate; tree gfor_fndecl_allocate64; tree gfor_fndecl_deallocate; tree gfor_fndecl_pause_numeric; tree gfor_fndecl_pause_string; tree gfor_fndecl_stop_numeric; tree gfor_fndecl_stop_string; tree gfor_fndecl_select_string; tree gfor_fndecl_runtime_error; tree gfor_fndecl_set_std; tree gfor_fndecl_in_pack; tree gfor_fndecl_in_unpack; tree gfor_fndecl_associated; /* Math functions. Many other math functions are handled in trans-intrinsic.c. */ gfc_powdecl_list gfor_fndecl_math_powi[3][2]; tree gfor_fndecl_math_cpowf; tree gfor_fndecl_math_cpow; tree gfor_fndecl_math_ishftc4; tree gfor_fndecl_math_ishftc8; tree gfor_fndecl_math_exponent4; tree gfor_fndecl_math_exponent8; /* String functions. */ tree gfor_fndecl_copy_string; tree gfor_fndecl_compare_string; tree gfor_fndecl_concat_string; tree gfor_fndecl_string_len_trim; tree gfor_fndecl_string_index; tree gfor_fndecl_string_scan; tree gfor_fndecl_string_verify; tree gfor_fndecl_string_trim; tree gfor_fndecl_string_repeat; tree gfor_fndecl_adjustl; tree gfor_fndecl_adjustr; /* Other misc. runtime library functions. */ tree gfor_fndecl_size0; tree gfor_fndecl_size1; tree gfor_fndecl_iargc; /* Intrinsic functions implemented in FORTRAN. */ tree gfor_fndecl_si_kind; tree gfor_fndecl_sr_kind; static void gfc_add_decl_to_parent_function (tree decl) { gcc_assert (decl); DECL_CONTEXT (decl) = DECL_CONTEXT (current_function_decl); DECL_NONLOCAL (decl) = 1; TREE_CHAIN (decl) = saved_parent_function_decls; saved_parent_function_decls = decl; } void gfc_add_decl_to_function (tree decl) { gcc_assert (decl); TREE_USED (decl) = 1; DECL_CONTEXT (decl) = current_function_decl; TREE_CHAIN (decl) = saved_function_decls; saved_function_decls = decl; } /* Build a backend label declaration. Set TREE_USED for named labels. The context of the label is always the current_function_decl. All labels are marked artificial. */ tree gfc_build_label_decl (tree label_id) { /* 2^32 temporaries should be enough. */ static unsigned int tmp_num = 1; tree label_decl; char *label_name; if (label_id == NULL_TREE) { /* Build an internal label name. */ ASM_FORMAT_PRIVATE_NAME (label_name, "L", tmp_num++); label_id = get_identifier (label_name); } else label_name = NULL; /* Build the LABEL_DECL node. Labels have no type. */ label_decl = build_decl (LABEL_DECL, label_id, void_type_node); DECL_CONTEXT (label_decl) = current_function_decl; DECL_MODE (label_decl) = VOIDmode; /* We always define the label as used, even if the original source file never references the label. We don't want all kinds of spurious warnings for old-style Fortran code with too many labels. */ TREE_USED (label_decl) = 1; DECL_ARTIFICIAL (label_decl) = 1; return label_decl; } /* Returns the return label for the current function. */ tree gfc_get_return_label (void) { char name[GFC_MAX_SYMBOL_LEN + 10]; if (current_function_return_label) return current_function_return_label; sprintf (name, "__return_%s", IDENTIFIER_POINTER (DECL_NAME (current_function_decl))); current_function_return_label = gfc_build_label_decl (get_identifier (name)); DECL_ARTIFICIAL (current_function_return_label) = 1; return current_function_return_label; } /* Set the backend source location of a decl. */ void gfc_set_decl_location (tree decl, locus * loc) { #ifdef USE_MAPPED_LOCATION DECL_SOURCE_LOCATION (decl) = loc->lb->location; #else DECL_SOURCE_LINE (decl) = loc->lb->linenum; DECL_SOURCE_FILE (decl) = loc->lb->file->filename; #endif } /* Return the backend label declaration for a given label structure, or create it if it doesn't exist yet. */ tree gfc_get_label_decl (gfc_st_label * lp) { if (lp->backend_decl) return lp->backend_decl; else { char label_name[GFC_MAX_SYMBOL_LEN + 1]; tree label_decl; /* Validate the label declaration from the front end. */ gcc_assert (lp != NULL && lp->value <= MAX_LABEL_VALUE); /* Build a mangled name for the label. */ sprintf (label_name, "__label_%.6d", lp->value); /* Build the LABEL_DECL node. */ label_decl = gfc_build_label_decl (get_identifier (label_name)); /* Tell the debugger where the label came from. */ if (lp->value <= MAX_LABEL_VALUE) /* An internal label. */ gfc_set_decl_location (label_decl, &lp->where); else DECL_ARTIFICIAL (label_decl) = 1; /* Store the label in the label list and return the LABEL_DECL. */ lp->backend_decl = label_decl; return label_decl; } } /* Convert a gfc_symbol to an identifier of the same name. */ static tree gfc_sym_identifier (gfc_symbol * sym) { return (get_identifier (sym->name)); } /* Construct mangled name from symbol name. */ static tree gfc_sym_mangled_identifier (gfc_symbol * sym) { char name[GFC_MAX_MANGLED_SYMBOL_LEN + 1]; if (sym->module == NULL) return gfc_sym_identifier (sym); else { snprintf (name, sizeof name, "__%s__%s", sym->module, sym->name); return get_identifier (name); } } /* Construct mangled function name from symbol name. */ static tree gfc_sym_mangled_function_id (gfc_symbol * sym) { int has_underscore; char name[GFC_MAX_MANGLED_SYMBOL_LEN + 1]; if (sym->module == NULL || sym->attr.proc == PROC_EXTERNAL || (sym->module != NULL && sym->attr.if_source == IFSRC_IFBODY)) { if (strcmp (sym->name, "MAIN__") == 0 || sym->attr.proc == PROC_INTRINSIC) return get_identifier (sym->name); if (gfc_option.flag_underscoring) { has_underscore = strchr (sym->name, '_') != 0; if (gfc_option.flag_second_underscore && has_underscore) snprintf (name, sizeof name, "%s__", sym->name); else snprintf (name, sizeof name, "%s_", sym->name); return get_identifier (name); } else return get_identifier (sym->name); } else { snprintf (name, sizeof name, "__%s__%s", sym->module, sym->name); return get_identifier (name); } } /* Returns true if a variable of specified size should go on the stack. */ int gfc_can_put_var_on_stack (tree size) { unsigned HOST_WIDE_INT low; if (!INTEGER_CST_P (size)) return 0; if (gfc_option.flag_max_stack_var_size < 0) return 1; if (TREE_INT_CST_HIGH (size) != 0) return 0; low = TREE_INT_CST_LOW (size); if (low > (unsigned HOST_WIDE_INT) gfc_option.flag_max_stack_var_size) return 0; /* TODO: Set a per-function stack size limit. */ return 1; } /* Finish processing of a declaration and install its initial value. */ static void gfc_finish_decl (tree decl, tree init) { if (TREE_CODE (decl) == PARM_DECL) gcc_assert (init == NULL_TREE); /* Remember that PARM_DECL doesn't have a DECL_INITIAL field per se -- it overlaps DECL_ARG_TYPE. */ else if (init == NULL_TREE) gcc_assert (DECL_INITIAL (decl) == NULL_TREE); else gcc_assert (DECL_INITIAL (decl) == error_mark_node); if (init != NULL_TREE) { if (TREE_CODE (decl) != TYPE_DECL) DECL_INITIAL (decl) = init; else { /* typedef foo = bar; store the type of bar as the type of foo. */ TREE_TYPE (decl) = TREE_TYPE (init); DECL_INITIAL (decl) = init = 0; } } if (TREE_CODE (decl) == VAR_DECL) { if (DECL_SIZE (decl) == NULL_TREE && TYPE_SIZE (TREE_TYPE (decl)) != NULL_TREE) layout_decl (decl, 0); /* A static variable with an incomplete type is an error if it is initialized. Also if it is not file scope. Otherwise, let it through, but if it is not `extern' then it may cause an error message later. */ /* An automatic variable with an incomplete type is an error. */ if (DECL_SIZE (decl) == NULL_TREE && (TREE_STATIC (decl) ? (DECL_INITIAL (decl) != 0 || DECL_CONTEXT (decl) != 0) : !DECL_EXTERNAL (decl))) { gfc_fatal_error ("storage size not known"); } if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl)) && (DECL_SIZE (decl) != 0) && (TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST)) { gfc_fatal_error ("storage size not constant"); } } } /* Apply symbol attributes to a variable, and add it to the function scope. */ static void gfc_finish_var_decl (tree decl, gfc_symbol * sym) { /* TREE_ADDRESSABLE means the address of this variable is actually needed. This is the equivalent of the TARGET variables. We also need to set this if the variable is passed by reference in a CALL statement. */ if (sym->attr.target) TREE_ADDRESSABLE (decl) = 1; /* If it wasn't used we wouldn't be getting it. */ TREE_USED (decl) = 1; /* Chain this decl to the pending declarations. Don't do pushdecl() because this would add them to the current scope rather than the function scope. */ if (current_function_decl != NULL_TREE) { if (sym->ns->proc_name->backend_decl == current_function_decl) gfc_add_decl_to_function (decl); else gfc_add_decl_to_parent_function (decl); } /* If a variable is USE associated, it's always external. */ if (sym->attr.use_assoc) { DECL_EXTERNAL (decl) = 1; TREE_PUBLIC (decl) = 1; } else if (sym->module && !sym->attr.result && !sym->attr.dummy) { /* TODO: Don't set sym->module for result or dummy variables. */ gcc_assert (current_function_decl == NULL_TREE); /* This is the declaration of a module variable. */ TREE_PUBLIC (decl) = 1; TREE_STATIC (decl) = 1; } if ((sym->attr.save || sym->attr.data || sym->value) && !sym->attr.use_assoc) TREE_STATIC (decl) = 1; /* Keep variables larger than max-stack-var-size off stack. */ if (!sym->ns->proc_name->attr.recursive && INTEGER_CST_P (DECL_SIZE_UNIT (decl)) && !gfc_can_put_var_on_stack (DECL_SIZE_UNIT (decl))) TREE_STATIC (decl) = 1; } /* Allocate the lang-specific part of a decl. */ void gfc_allocate_lang_decl (tree decl) { DECL_LANG_SPECIFIC (decl) = (struct lang_decl *) ggc_alloc_cleared (sizeof (struct lang_decl)); } /* Remember a symbol to generate initialization/cleanup code at function entry/exit. */ static void gfc_defer_symbol_init (gfc_symbol * sym) { gfc_symbol *p; gfc_symbol *last; gfc_symbol *head; /* Don't add a symbol twice. */ if (sym->tlink) return; last = head = sym->ns->proc_name; p = last->tlink; /* Make sure that setup code for dummy variables which are used in the setup of other variables is generated first. */ if (sym->attr.dummy) { /* Find the first dummy arg seen after us, or the first non-dummy arg. This is a circular list, so don't go past the head. */ while (p != head && (!p->attr.dummy || p->dummy_order > sym->dummy_order)) { last = p; p = p->tlink; } } /* Insert in between last and p. */ last->tlink = sym; sym->tlink = p; } /* Create an array index type variable with function scope. */ static tree create_index_var (const char * pfx, int nest) { tree decl; decl = gfc_create_var_np (gfc_array_index_type, pfx); if (nest) gfc_add_decl_to_parent_function (decl); else gfc_add_decl_to_function (decl); return decl; } /* Create variables to hold all the non-constant bits of info for a descriptorless array. Remember these in the lang-specific part of the type. */ static void gfc_build_qualified_array (tree decl, gfc_symbol * sym) { tree type; int dim; int nest; type = TREE_TYPE (decl); /* We just use the descriptor, if there is one. */ if (GFC_DESCRIPTOR_TYPE_P (type)) return; gcc_assert (GFC_ARRAY_TYPE_P (type)); nest = (sym->ns->proc_name->backend_decl != current_function_decl) && !sym->attr.contained; for (dim = 0; dim < GFC_TYPE_ARRAY_RANK (type); dim++) { if (GFC_TYPE_ARRAY_LBOUND (type, dim) == NULL_TREE) GFC_TYPE_ARRAY_LBOUND (type, dim) = create_index_var ("lbound", nest); /* Don't try to use the unknown bound for assumed shape arrays. */ if (GFC_TYPE_ARRAY_UBOUND (type, dim) == NULL_TREE && (sym->as->type != AS_ASSUMED_SIZE || dim < GFC_TYPE_ARRAY_RANK (type) - 1)) GFC_TYPE_ARRAY_UBOUND (type, dim) = create_index_var ("ubound", nest); if (GFC_TYPE_ARRAY_STRIDE (type, dim) == NULL_TREE) GFC_TYPE_ARRAY_STRIDE (type, dim) = create_index_var ("stride", nest); } if (GFC_TYPE_ARRAY_OFFSET (type) == NULL_TREE) { GFC_TYPE_ARRAY_OFFSET (type) = gfc_create_var_np (gfc_array_index_type, "offset"); if (nest) gfc_add_decl_to_parent_function (GFC_TYPE_ARRAY_OFFSET (type)); else gfc_add_decl_to_function (GFC_TYPE_ARRAY_OFFSET (type)); } } /* For some dummy arguments we don't use the actual argument directly. Instead we create a local decl and use that. This allows us to perform initialization, and construct full type information. */ static tree gfc_build_dummy_array_decl (gfc_symbol * sym, tree dummy) { tree decl; tree type; gfc_array_spec *as; char *name; int packed; int n; bool known_size; if (sym->attr.pointer || sym->attr.allocatable) return dummy; /* Add to list of variables if not a fake result variable. */ if (sym->attr.result || sym->attr.dummy) gfc_defer_symbol_init (sym); type = TREE_TYPE (dummy); gcc_assert (TREE_CODE (dummy) == PARM_DECL && POINTER_TYPE_P (type)); /* Do we know the element size? */ known_size = sym->ts.type != BT_CHARACTER || INTEGER_CST_P (sym->ts.cl->backend_decl); if (known_size && !GFC_DESCRIPTOR_TYPE_P (TREE_TYPE (type))) { /* For descriptorless arrays with known element size the actual argument is sufficient. */ gcc_assert (GFC_ARRAY_TYPE_P (type)); gfc_build_qualified_array (dummy, sym); return dummy; } type = TREE_TYPE (type); if (GFC_DESCRIPTOR_TYPE_P (type)) { /* Create a decriptorless array pointer. */ as = sym->as; packed = 0; if (!gfc_option.flag_repack_arrays) { if (as->type == AS_ASSUMED_SIZE) packed = 2; } else { if (as->type == AS_EXPLICIT) { packed = 2; for (n = 0; n < as->rank; n++) { if (!(as->upper[n] && as->lower[n] && as->upper[n]->expr_type == EXPR_CONSTANT && as->lower[n]->expr_type == EXPR_CONSTANT)) packed = 1; } } else packed = 1; } type = gfc_typenode_for_spec (&sym->ts); type = gfc_get_nodesc_array_type (type, sym->as, packed); } else { /* We now have an expression for the element size, so create a fully qualified type. Reset sym->backend decl or this will just return the old type. */ sym->backend_decl = NULL_TREE; type = gfc_sym_type (sym); packed = 2; } ASM_FORMAT_PRIVATE_NAME (name, IDENTIFIER_POINTER (DECL_NAME (dummy)), 0); decl = build_decl (VAR_DECL, get_identifier (name), type); DECL_ARTIFICIAL (decl) = 1; TREE_PUBLIC (decl) = 0; TREE_STATIC (decl) = 0; DECL_EXTERNAL (decl) = 0; /* We should never get deferred shape arrays here. We used to because of frontend bugs. */ gcc_assert (sym->as->type != AS_DEFERRED); switch (packed) { case 1: GFC_DECL_PARTIAL_PACKED_ARRAY (decl) = 1; break; case 2: GFC_DECL_PACKED_ARRAY (decl) = 1; break; } gfc_build_qualified_array (decl, sym); if (DECL_LANG_SPECIFIC (dummy)) DECL_LANG_SPECIFIC (decl) = DECL_LANG_SPECIFIC (dummy); else gfc_allocate_lang_decl (decl); GFC_DECL_SAVED_DESCRIPTOR (decl) = dummy; if (sym->ns->proc_name->backend_decl == current_function_decl || sym->attr.contained) gfc_add_decl_to_function (decl); else gfc_add_decl_to_parent_function (decl); return decl; } /* Return a constant or a variable to use as a string length. Does not add the decl to the current scope. */ static tree gfc_create_string_length (gfc_symbol * sym) { tree length; gcc_assert (sym->ts.cl); gfc_conv_const_charlen (sym->ts.cl); if (sym->ts.cl->backend_decl == NULL_TREE) { char name[GFC_MAX_MANGLED_SYMBOL_LEN + 2]; /* Also prefix the mangled name. */ strcpy (&name[1], sym->name); name[0] = '.'; length = build_decl (VAR_DECL, get_identifier (name), gfc_charlen_type_node); DECL_ARTIFICIAL (length) = 1; TREE_USED (length) = 1; gfc_defer_symbol_init (sym); sym->ts.cl->backend_decl = length; } return sym->ts.cl->backend_decl; } /* Return the decl for a gfc_symbol, create it if it doesn't already exist. */ tree gfc_get_symbol_decl (gfc_symbol * sym) { tree decl; tree length = NULL_TREE; int byref; gcc_assert (sym->attr.referenced); if (sym->ns && sym->ns->proc_name->attr.function) byref = gfc_return_by_reference (sym->ns->proc_name); else byref = 0; if ((sym->attr.dummy && ! sym->attr.function) || (sym->attr.result && byref)) { /* Return via extra parameter. */ if (sym->attr.result && byref && !sym->backend_decl) { sym->backend_decl = DECL_ARGUMENTS (sym->ns->proc_name->backend_decl); /* For entry master function skip over the __entry argument. */ if (sym->ns->proc_name->attr.entry_master) sym->backend_decl = TREE_CHAIN (sym->backend_decl); } /* Dummy variables should already have been created. */ gcc_assert (sym->backend_decl); /* Create a character length variable. */ if (sym->ts.type == BT_CHARACTER) { if (sym->ts.cl->backend_decl == NULL_TREE) { length = gfc_create_string_length (sym); if (TREE_CODE (length) != INTEGER_CST) { gfc_finish_var_decl (length, sym); gfc_defer_symbol_init (sym); } } } /* Use a copy of the descriptor for dummy arrays. */ if (sym->attr.dimension && !TREE_USED (sym->backend_decl)) { sym->backend_decl = gfc_build_dummy_array_decl (sym, sym->backend_decl); } TREE_USED (sym->backend_decl) = 1; return sym->backend_decl; } if (sym->backend_decl) return sym->backend_decl; /* Catch function declarations. Only used for actual parameters. */ if (sym->attr.flavor == FL_PROCEDURE) { decl = gfc_get_extern_function_decl (sym); return decl; } if (sym->attr.intrinsic) internal_error ("intrinsic variable which isn't a procedure"); /* Create string length decl first so that they can be used in the type declaration. */ if (sym->ts.type == BT_CHARACTER) length = gfc_create_string_length (sym); /* Create the decl for the variable. */ decl = build_decl (VAR_DECL, gfc_sym_identifier (sym), gfc_sym_type (sym)); gfc_set_decl_location (decl, &sym->declared_at); /* Symbols from modules should have their assembler names mangled. This is done here rather than in gfc_finish_var_decl because it is different for string length variables. */ if (sym->module) SET_DECL_ASSEMBLER_NAME (decl, gfc_sym_mangled_identifier (sym)); if (sym->attr.dimension) { /* Create variables to hold the non-constant bits of array info. */ gfc_build_qualified_array (decl, sym); /* Remember this variable for allocation/cleanup. */ gfc_defer_symbol_init (sym); if ((sym->attr.allocatable || !sym->attr.dummy) && !sym->attr.pointer) GFC_DECL_PACKED_ARRAY (decl) = 1; } gfc_finish_var_decl (decl, sym); if (sym->attr.assign) { gfc_allocate_lang_decl (decl); GFC_DECL_ASSIGN (decl) = 1; length = gfc_create_var (gfc_charlen_type_node, sym->name); GFC_DECL_STRING_LEN (decl) = length; GFC_DECL_ASSIGN_ADDR (decl) = gfc_create_var (pvoid_type_node, sym->name); /* TODO: Need to check we don't change TREE_STATIC (decl) later. */ TREE_STATIC (length) = TREE_STATIC (decl); /* STRING_LENGTH is also used as flag. Less than -1 means that ASSIGN_ADDR can not be used. Equal -1 means that ASSIGN_ADDR is the target label's address. Other value is the length of format string and ASSIGN_ADDR is the address of format string. */ DECL_INITIAL (length) = build_int_cst (NULL_TREE, -2); } if (sym->ts.type == BT_CHARACTER) { /* Character variables need special handling. */ gfc_allocate_lang_decl (decl); if (TREE_CODE (length) != INTEGER_CST) { char name[GFC_MAX_MANGLED_SYMBOL_LEN + 2]; if (sym->module) { /* Also prefix the mangled name for symbols from modules. */ strcpy (&name[1], sym->name); name[0] = '.'; strcpy (&name[1], IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (length))); SET_DECL_ASSEMBLER_NAME (decl, get_identifier (name)); } gfc_finish_var_decl (length, sym); gcc_assert (!sym->value); } } sym->backend_decl = decl; if (TREE_STATIC (decl) && !sym->attr.use_assoc) { /* Add static initializer. */ DECL_INITIAL (decl) = gfc_conv_initializer (sym->value, &sym->ts, TREE_TYPE (decl), sym->attr.dimension, sym->attr.pointer || sym->attr.allocatable); } return decl; } /* Substitute a temporary variable in place of the real one. */ void gfc_shadow_sym (gfc_symbol * sym, tree decl, gfc_saved_var * save) { save->attr = sym->attr; save->decl = sym->backend_decl; gfc_clear_attr (&sym->attr); sym->attr.referenced = 1; sym->attr.flavor = FL_VARIABLE; sym->backend_decl = decl; } /* Restore the original variable. */ void gfc_restore_sym (gfc_symbol * sym, gfc_saved_var * save) { sym->attr = save->attr; sym->backend_decl = save->decl; } /* Get a basic decl for an external function. */ tree gfc_get_extern_function_decl (gfc_symbol * sym) { tree type; tree fndecl; gfc_expr e; gfc_intrinsic_sym *isym; gfc_expr argexpr; char s[GFC_MAX_SYMBOL_LEN + 13]; /* "f2c_specific" and '\0'. */ tree name; tree mangled_name; if (sym->backend_decl) return sym->backend_decl; /* We should never be creating external decls for alternate entry points. The procedure may be an alternate entry point, but we don't want/need to know that. */ gcc_assert (!(sym->attr.entry || sym->attr.entry_master)); if (sym->attr.intrinsic) { /* Call the resolution function to get the actual name. This is a nasty hack which relies on the resolution functions only looking at the first argument. We pass NULL for the second argument otherwise things like AINT get confused. */ isym = gfc_find_function (sym->name); gcc_assert (isym->resolve.f0 != NULL); memset (&e, 0, sizeof (e)); e.expr_type = EXPR_FUNCTION; memset (&argexpr, 0, sizeof (argexpr)); gcc_assert (isym->formal); argexpr.ts = isym->formal->ts; if (isym->formal->next == NULL) isym->resolve.f1 (&e, &argexpr); else { /* All specific intrinsics take one or two arguments. */ gcc_assert (isym->formal->next->next == NULL); isym->resolve.f2 (&e, &argexpr, NULL); } if (gfc_option.flag_f2c && ((e.ts.type == BT_REAL && e.ts.kind == gfc_default_real_kind) || e.ts.type == BT_COMPLEX)) { /* Specific which needs a different implementation if f2c calling conventions are used. */ sprintf (s, "f2c_specific%s", e.value.function.name); } else sprintf (s, "specific%s", e.value.function.name); name = get_identifier (s); mangled_name = name; } else { name = gfc_sym_identifier (sym); mangled_name = gfc_sym_mangled_function_id (sym); } type = gfc_get_function_type (sym); fndecl = build_decl (FUNCTION_DECL, name, type); SET_DECL_ASSEMBLER_NAME (fndecl, mangled_name); /* If the return type is a pointer, avoid alias issues by setting DECL_IS_MALLOC to nonzero. This means that the function should be treated as if it were a malloc, meaning it returns a pointer that is not an alias. */ if (POINTER_TYPE_P (type)) DECL_IS_MALLOC (fndecl) = 1; /* Set the context of this decl. */ if (0 && sym->ns && sym->ns->proc_name) { /* TODO: Add external decls to the appropriate scope. */ DECL_CONTEXT (fndecl) = sym->ns->proc_name->backend_decl; } else { /* Global declaration, e.g. intrinsic subroutine. */ DECL_CONTEXT (fndecl) = NULL_TREE; } DECL_EXTERNAL (fndecl) = 1; /* This specifies if a function is globally addressable, i.e. it is the opposite of declaring static in C. */ TREE_PUBLIC (fndecl) = 1; /* Set attributes for PURE functions. A call to PURE function in the Fortran 95 sense is both pure and without side effects in the C sense. */ if (sym->attr.pure || sym->attr.elemental) { if (sym->attr.function) DECL_IS_PURE (fndecl) = 1; /* TODO: check if pure SUBROUTINEs don't have INTENT(OUT) parameters and don't use alternate returns (is this allowed?). In that case, calls to them are meaningless, and can be optimized away. See also in build_function_decl(). */ TREE_SIDE_EFFECTS (fndecl) = 0; } sym->backend_decl = fndecl; if (DECL_CONTEXT (fndecl) == NULL_TREE) pushdecl_top_level (fndecl); return fndecl; } /* Create a declaration for a procedure. For external functions (in the C sense) use gfc_get_extern_function_decl. HAS_ENTRIES is true if this is a master function with alternate entry points. */ static void build_function_decl (gfc_symbol * sym) { tree fndecl, type; symbol_attribute attr; tree result_decl; gfc_formal_arglist *f; gcc_assert (!sym->backend_decl); gcc_assert (!sym->attr.external); /* Set the line and filename. sym->declared_at seems to point to the last statement for subroutines, but it'll do for now. */ gfc_set_backend_locus (&sym->declared_at); /* Allow only one nesting level. Allow public declarations. */ gcc_assert (current_function_decl == NULL_TREE || DECL_CONTEXT (current_function_decl) == NULL_TREE); type = gfc_get_function_type (sym); fndecl = build_decl (FUNCTION_DECL, gfc_sym_identifier (sym), type); /* Perform name mangling if this is a top level or module procedure. */ if (current_function_decl == NULL_TREE) SET_DECL_ASSEMBLER_NAME (fndecl, gfc_sym_mangled_function_id (sym)); /* Figure out the return type of the declared function, and build a RESULT_DECL for it. If this is a subroutine with alternate returns, build a RESULT_DECL for it. */ attr = sym->attr; result_decl = NULL_TREE; /* TODO: Shouldn't this just be TREE_TYPE (TREE_TYPE (fndecl)). */ if (attr.function) { if (gfc_return_by_reference (sym)) type = void_type_node; else { if (sym->result != sym) result_decl = gfc_sym_identifier (sym->result); type = TREE_TYPE (TREE_TYPE (fndecl)); } } else { /* Look for alternate return placeholders. */ int has_alternate_returns = 0; for (f = sym->formal; f; f = f->next) { if (f->sym == NULL) { has_alternate_returns = 1; break; } } if (has_alternate_returns) type = integer_type_node; else type = void_type_node; } result_decl = build_decl (RESULT_DECL, result_decl, type); DECL_ARTIFICIAL (result_decl) = 1; DECL_IGNORED_P (result_decl) = 1; DECL_CONTEXT (result_decl) = fndecl; DECL_RESULT (fndecl) = result_decl; /* Don't call layout_decl for a RESULT_DECL. layout_decl (result_decl, 0); */ /* If the return type is a pointer, avoid alias issues by setting DECL_IS_MALLOC to nonzero. This means that the function should be treated as if it were a malloc, meaning it returns a pointer that is not an alias. */ if (POINTER_TYPE_P (type)) DECL_IS_MALLOC (fndecl) = 1; /* Set up all attributes for the function. */ DECL_CONTEXT (fndecl) = current_function_decl; DECL_EXTERNAL (fndecl) = 0; /* This specifies if a function is globally visible, i.e. it is the opposite of declaring static in C. */ if (DECL_CONTEXT (fndecl) == NULL_TREE && !sym->attr.entry_master) TREE_PUBLIC (fndecl) = 1; /* TREE_STATIC means the function body is defined here. */ TREE_STATIC (fndecl) = 1; /* Set attributes for PURE functions. A call to a PURE function in the Fortran 95 sense is both pure and without side effects in the C sense. */ if (attr.pure || attr.elemental) { /* TODO: check if a pure SUBROUTINE has no INTENT(OUT) arguments including a alternate return. In that case it can also be marked as PURE. See also in gfc_get_extern_function_decl(). */ if (attr.function) DECL_IS_PURE (fndecl) = 1; TREE_SIDE_EFFECTS (fndecl) = 0; } /* Layout the function declaration and put it in the binding level of the current function. */ pushdecl (fndecl); sym->backend_decl = fndecl; } /* Create the DECL_ARGUMENTS for a procedure. */ static void create_function_arglist (gfc_symbol * sym) { tree fndecl; gfc_formal_arglist *f; tree typelist; tree arglist; tree length; tree type; tree parm; fndecl = sym->backend_decl; /* Build formal argument list. Make sure that their TREE_CONTEXT is the new FUNCTION_DECL node. */ arglist = NULL_TREE; typelist = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); if (sym->attr.entry_master) { type = TREE_VALUE (typelist); parm = build_decl (PARM_DECL, get_identifier ("__entry"), type); DECL_CONTEXT (parm) = fndecl; DECL_ARG_TYPE (parm) = type; TREE_READONLY (parm) = 1; gfc_finish_decl (parm, NULL_TREE); arglist = chainon (arglist, parm); typelist = TREE_CHAIN (typelist); } if (gfc_return_by_reference (sym)) { type = TREE_VALUE (typelist); parm = build_decl (PARM_DECL, get_identifier ("__result"), type); DECL_CONTEXT (parm) = fndecl; DECL_ARG_TYPE (parm) = type; TREE_READONLY (parm) = 1; DECL_ARTIFICIAL (parm) = 1; gfc_finish_decl (parm, NULL_TREE); arglist = chainon (arglist, parm); typelist = TREE_CHAIN (typelist); if (sym->ts.type == BT_CHARACTER) { gfc_allocate_lang_decl (parm); /* Length of character result. */ type = TREE_VALUE (typelist); gcc_assert (type == gfc_charlen_type_node); length = build_decl (PARM_DECL, get_identifier (".__result"), type); if (!sym->ts.cl->length) { sym->ts.cl->backend_decl = length; TREE_USED (length) = 1; } gcc_assert (TREE_CODE (length) == PARM_DECL); arglist = chainon (arglist, length); typelist = TREE_CHAIN (typelist); DECL_CONTEXT (length) = fndecl; DECL_ARG_TYPE (length) = type; TREE_READONLY (length) = 1; DECL_ARTIFICIAL (length) = 1; gfc_finish_decl (length, NULL_TREE); } } for (f = sym->formal; f; f = f->next) { if (f->sym != NULL) /* ignore alternate returns. */ { length = NULL_TREE; type = TREE_VALUE (typelist); /* Build a the argument declaration. */ parm = build_decl (PARM_DECL, gfc_sym_identifier (f->sym), type); /* Fill in arg stuff. */ DECL_CONTEXT (parm) = fndecl; DECL_ARG_TYPE (parm) = type; /* All implementation args are read-only. */ TREE_READONLY (parm) = 1; gfc_finish_decl (parm, NULL_TREE); f->sym->backend_decl = parm; arglist = chainon (arglist, parm); typelist = TREE_CHAIN (typelist); } } /* Add the hidden string length parameters. */ parm = arglist; for (f = sym->formal; f; f = f->next) { char name[GFC_MAX_SYMBOL_LEN + 2]; /* Ignore alternate returns. */ if (f->sym == NULL) continue; if (f->sym->ts.type != BT_CHARACTER) continue; parm = f->sym->backend_decl; type = TREE_VALUE (typelist); gcc_assert (type == gfc_charlen_type_node); strcpy (&name[1], f->sym->name); name[0] = '_'; length = build_decl (PARM_DECL, get_identifier (name), type); arglist = chainon (arglist, length); DECL_CONTEXT (length) = fndecl; DECL_ARTIFICIAL (length) = 1; DECL_ARG_TYPE (length) = type; TREE_READONLY (length) = 1; gfc_finish_decl (length, NULL_TREE); /* TODO: Check string lengths when -fbounds-check. */ /* Use the passed value for assumed length variables. */ if (!f->sym->ts.cl->length) { TREE_USED (length) = 1; if (!f->sym->ts.cl->backend_decl) f->sym->ts.cl->backend_decl = length; else { /* there is already another variable using this gfc_charlen node, build a new one for this variable and chain it into the list of gfc_charlens. This happens for e.g. in the case CHARACTER(*)::c1,c2 since CHARACTER declarations on the same line share the same gfc_charlen node. */ gfc_charlen *cl; cl = gfc_get_charlen (); cl->backend_decl = length; cl->next = f->sym->ts.cl->next; f->sym->ts.cl->next = cl; f->sym->ts.cl = cl; } } parm = TREE_CHAIN (parm); typelist = TREE_CHAIN (typelist); } gcc_assert (TREE_VALUE (typelist) == void_type_node); DECL_ARGUMENTS (fndecl) = arglist; } /* Convert FNDECL's code to GIMPLE and handle any nested functions. */ static void gfc_gimplify_function (tree fndecl) { struct cgraph_node *cgn; gimplify_function_tree (fndecl); dump_function (TDI_generic, fndecl); /* Convert all nested functions to GIMPLE now. We do things in this order so that items like VLA sizes are expanded properly in the context of the correct function. */ cgn = cgraph_node (fndecl); for (cgn = cgn->nested; cgn; cgn = cgn->next_nested) gfc_gimplify_function (cgn->decl); } /* Do the setup necessary before generating the body of a function. */ static void trans_function_start (gfc_symbol * sym) { tree fndecl; fndecl = sym->backend_decl; /* Let GCC know the current scope is this function. */ current_function_decl = fndecl; /* Let the world know what we're about to do. */ announce_function (fndecl); if (DECL_CONTEXT (fndecl) == NULL_TREE) { /* Create RTL for function declaration. */ rest_of_decl_compilation (fndecl, 1, 0); } /* Create RTL for function definition. */ make_decl_rtl (fndecl); init_function_start (fndecl); /* Even though we're inside a function body, we still don't want to call expand_expr to calculate the size of a variable-sized array. We haven't necessarily assigned RTL to all variables yet, so it's not safe to try to expand expressions involving them. */ cfun->x_dont_save_pending_sizes_p = 1; /* function.c requires a push at the start of the function. */ pushlevel (0); } /* Create thunks for alternate entry points. */ static void build_entry_thunks (gfc_namespace * ns) { gfc_formal_arglist *formal; gfc_formal_arglist *thunk_formal; gfc_entry_list *el; gfc_symbol *thunk_sym; stmtblock_t body; tree thunk_fndecl; tree args; tree string_args; tree tmp; locus old_loc; /* This should always be a toplevel function. */ gcc_assert (current_function_decl == NULL_TREE); gfc_get_backend_locus (&old_loc); for (el = ns->entries; el; el = el->next) { thunk_sym = el->sym; build_function_decl (thunk_sym); create_function_arglist (thunk_sym); trans_function_start (thunk_sym); thunk_fndecl = thunk_sym->backend_decl; gfc_start_block (&body); /* Pass extra parameter identifying this entry point. */ tmp = build_int_cst (gfc_array_index_type, el->id); args = tree_cons (NULL_TREE, tmp, NULL_TREE); string_args = NULL_TREE; if (thunk_sym->attr.function) { if (gfc_return_by_reference (ns->proc_name)) { tree ref = DECL_ARGUMENTS (current_function_decl); args = tree_cons (NULL_TREE, ref, args); if (ns->proc_name->ts.type == BT_CHARACTER) args = tree_cons (NULL_TREE, TREE_CHAIN (ref), args); } } for (formal = ns->proc_name->formal; formal; formal = formal->next) { /* Ignore alternate returns. */ if (formal->sym == NULL) continue; /* We don't have a clever way of identifying arguments, so resort to a brute-force search. */ for (thunk_formal = thunk_sym->formal; thunk_formal; thunk_formal = thunk_formal->next) { if (thunk_formal->sym == formal->sym) break; } if (thunk_formal) { /* Pass the argument. */ args = tree_cons (NULL_TREE, thunk_formal->sym->backend_decl, args); if (formal->sym->ts.type == BT_CHARACTER) { tmp = thunk_formal->sym->ts.cl->backend_decl; string_args = tree_cons (NULL_TREE, tmp, string_args); } } else { /* Pass NULL for a missing argument. */ args = tree_cons (NULL_TREE, null_pointer_node, args); if (formal->sym->ts.type == BT_CHARACTER) { tmp = convert (gfc_charlen_type_node, integer_zero_node); string_args = tree_cons (NULL_TREE, tmp, string_args); } } } /* Call the master function. */ args = nreverse (args); args = chainon (args, nreverse (string_args)); tmp = ns->proc_name->backend_decl; tmp = gfc_build_function_call (tmp, args); if (ns->proc_name->attr.mixed_entry_master) { tree union_decl, field; tree master_type = TREE_TYPE (ns->proc_name->backend_decl); union_decl = build_decl (VAR_DECL, get_identifier ("__result"), TREE_TYPE (master_type)); DECL_ARTIFICIAL (union_decl) = 1; DECL_EXTERNAL (union_decl) = 0; TREE_PUBLIC (union_decl) = 0; TREE_USED (union_decl) = 1; layout_decl (union_decl, 0); pushdecl (union_decl); DECL_CONTEXT (union_decl) = current_function_decl; tmp = build2 (MODIFY_EXPR, TREE_TYPE (union_decl), union_decl, tmp); gfc_add_expr_to_block (&body, tmp); for (field = TYPE_FIELDS (TREE_TYPE (union_decl)); field; field = TREE_CHAIN (field)) if (strcmp (IDENTIFIER_POINTER (DECL_NAME (field)), thunk_sym->result->name) == 0) break; gcc_assert (field != NULL_TREE); tmp = build3 (COMPONENT_REF, TREE_TYPE (field), union_decl, field, NULL_TREE); tmp = build2 (MODIFY_EXPR, TREE_TYPE (DECL_RESULT (current_function_decl)), DECL_RESULT (current_function_decl), tmp); tmp = build1_v (RETURN_EXPR, tmp); } else if (TREE_TYPE (DECL_RESULT (current_function_decl)) != void_type_node) { tmp = build2 (MODIFY_EXPR, TREE_TYPE (DECL_RESULT (current_function_decl)), DECL_RESULT (current_function_decl), tmp); tmp = build1_v (RETURN_EXPR, tmp); } gfc_add_expr_to_block (&body, tmp); /* Finish off this function and send it for code generation. */ DECL_SAVED_TREE (thunk_fndecl) = gfc_finish_block (&body); poplevel (1, 0, 1); BLOCK_SUPERCONTEXT (DECL_INITIAL (thunk_fndecl)) = thunk_fndecl; /* Output the GENERIC tree. */ dump_function (TDI_original, thunk_fndecl); /* Store the end of the function, so that we get good line number info for the epilogue. */ cfun->function_end_locus = input_location; /* We're leaving the context of this function, so zap cfun. It's still in DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */ cfun = NULL; current_function_decl = NULL_TREE; gfc_gimplify_function (thunk_fndecl); cgraph_finalize_function (thunk_fndecl, false); /* We share the symbols in the formal argument list with other entry points and the master function. Clear them so that they are recreated for each function. */ for (formal = thunk_sym->formal; formal; formal = formal->next) if (formal->sym != NULL) /* Ignore alternate returns. */ { formal->sym->backend_decl = NULL_TREE; if (formal->sym->ts.type == BT_CHARACTER) formal->sym->ts.cl->backend_decl = NULL_TREE; } if (thunk_sym->attr.function) { if (thunk_sym->ts.type == BT_CHARACTER) thunk_sym->ts.cl->backend_decl = NULL_TREE; if (thunk_sym->result->ts.type == BT_CHARACTER) thunk_sym->result->ts.cl->backend_decl = NULL_TREE; } } gfc_set_backend_locus (&old_loc); } /* Create a decl for a function, and create any thunks for alternate entry points. */ void gfc_create_function_decl (gfc_namespace * ns) { /* Create a declaration for the master function. */ build_function_decl (ns->proc_name); /* Compile the entry thunks. */ if (ns->entries) build_entry_thunks (ns); /* Now create the read argument list. */ create_function_arglist (ns->proc_name); } /* Return the decl used to hold the function return value. */ tree gfc_get_fake_result_decl (gfc_symbol * sym) { tree decl; tree length; char name[GFC_MAX_SYMBOL_LEN + 10]; if (sym && sym->ns->proc_name->backend_decl == current_function_decl && sym->ns->proc_name->attr.mixed_entry_master && sym != sym->ns->proc_name) { decl = gfc_get_fake_result_decl (sym->ns->proc_name); if (decl) { tree field; for (field = TYPE_FIELDS (TREE_TYPE (decl)); field; field = TREE_CHAIN (field)) if (strcmp (IDENTIFIER_POINTER (DECL_NAME (field)), sym->name) == 0) break; gcc_assert (field != NULL_TREE); decl = build3 (COMPONENT_REF, TREE_TYPE (field), decl, field, NULL_TREE); } return decl; } if (current_fake_result_decl != NULL_TREE) return current_fake_result_decl; /* Only when gfc_get_fake_result_decl is called by gfc_trans_return, sym is NULL. */ if (!sym) return NULL_TREE; if (sym->ts.type == BT_CHARACTER && !sym->ts.cl->backend_decl) { length = gfc_create_string_length (sym); gfc_finish_var_decl (length, sym); } if (gfc_return_by_reference (sym)) { decl = DECL_ARGUMENTS (current_function_decl); if (sym->ns->proc_name->backend_decl == current_function_decl && sym->ns->proc_name->attr.entry_master) decl = TREE_CHAIN (decl); TREE_USED (decl) = 1; if (sym->as) decl = gfc_build_dummy_array_decl (sym, decl); } else { sprintf (name, "__result_%.20s", IDENTIFIER_POINTER (DECL_NAME (current_function_decl))); decl = build_decl (VAR_DECL, get_identifier (name), TREE_TYPE (TREE_TYPE (current_function_decl))); DECL_ARTIFICIAL (decl) = 1; DECL_EXTERNAL (decl) = 0; TREE_PUBLIC (decl) = 0; TREE_USED (decl) = 1; layout_decl (decl, 0); gfc_add_decl_to_function (decl); } current_fake_result_decl = decl; return decl; } /* Builds a function decl. The remaining parameters are the types of the function arguments. Negative nargs indicates a varargs function. */ tree gfc_build_library_function_decl (tree name, tree rettype, int nargs, ...) { tree arglist; tree argtype; tree fntype; tree fndecl; va_list p; int n; /* Library functions must be declared with global scope. */ gcc_assert (current_function_decl == NULL_TREE); va_start (p, nargs); /* Create a list of the argument types. */ for (arglist = NULL_TREE, n = abs (nargs); n > 0; n--) { argtype = va_arg (p, tree); arglist = gfc_chainon_list (arglist, argtype); } if (nargs >= 0) { /* Terminate the list. */ arglist = gfc_chainon_list (arglist, void_type_node); } /* Build the function type and decl. */ fntype = build_function_type (rettype, arglist); fndecl = build_decl (FUNCTION_DECL, name, fntype); /* Mark this decl as external. */ DECL_EXTERNAL (fndecl) = 1; TREE_PUBLIC (fndecl) = 1; va_end (p); pushdecl (fndecl); rest_of_decl_compilation (fndecl, 1, 0); return fndecl; } static void gfc_build_intrinsic_function_decls (void) { tree gfc_int4_type_node = gfc_get_int_type (4); tree gfc_int8_type_node = gfc_get_int_type (8); tree gfc_logical4_type_node = gfc_get_logical_type (4); tree gfc_real4_type_node = gfc_get_real_type (4); tree gfc_real8_type_node = gfc_get_real_type (8); tree gfc_complex4_type_node = gfc_get_complex_type (4); tree gfc_complex8_type_node = gfc_get_complex_type (8); /* String functions. */ gfor_fndecl_copy_string = gfc_build_library_function_decl (get_identifier (PREFIX("copy_string")), void_type_node, 4, gfc_charlen_type_node, pchar_type_node, gfc_charlen_type_node, pchar_type_node); gfor_fndecl_compare_string = gfc_build_library_function_decl (get_identifier (PREFIX("compare_string")), gfc_int4_type_node, 4, gfc_charlen_type_node, pchar_type_node, gfc_charlen_type_node, pchar_type_node); gfor_fndecl_concat_string = gfc_build_library_function_decl (get_identifier (PREFIX("concat_string")), void_type_node, 6, gfc_charlen_type_node, pchar_type_node, gfc_charlen_type_node, pchar_type_node, gfc_charlen_type_node, pchar_type_node); gfor_fndecl_string_len_trim = gfc_build_library_function_decl (get_identifier (PREFIX("string_len_trim")), gfc_int4_type_node, 2, gfc_charlen_type_node, pchar_type_node); gfor_fndecl_string_index = gfc_build_library_function_decl (get_identifier (PREFIX("string_index")), gfc_int4_type_node, 5, gfc_charlen_type_node, pchar_type_node, gfc_charlen_type_node, pchar_type_node, gfc_logical4_type_node); gfor_fndecl_string_scan = gfc_build_library_function_decl (get_identifier (PREFIX("string_scan")), gfc_int4_type_node, 5, gfc_charlen_type_node, pchar_type_node, gfc_charlen_type_node, pchar_type_node, gfc_logical4_type_node); gfor_fndecl_string_verify = gfc_build_library_function_decl (get_identifier (PREFIX("string_verify")), gfc_int4_type_node, 5, gfc_charlen_type_node, pchar_type_node, gfc_charlen_type_node, pchar_type_node, gfc_logical4_type_node); gfor_fndecl_string_trim = gfc_build_library_function_decl (get_identifier (PREFIX("string_trim")), void_type_node, 4, build_pointer_type (gfc_charlen_type_node), ppvoid_type_node, gfc_charlen_type_node, pchar_type_node); gfor_fndecl_string_repeat = gfc_build_library_function_decl (get_identifier (PREFIX("string_repeat")), void_type_node, 4, pchar_type_node, gfc_charlen_type_node, pchar_type_node, gfc_int4_type_node); gfor_fndecl_adjustl = gfc_build_library_function_decl (get_identifier (PREFIX("adjustl")), void_type_node, 3, pchar_type_node, gfc_charlen_type_node, pchar_type_node); gfor_fndecl_adjustr = gfc_build_library_function_decl (get_identifier (PREFIX("adjustr")), void_type_node, 3, pchar_type_node, gfc_charlen_type_node, pchar_type_node); gfor_fndecl_si_kind = gfc_build_library_function_decl (get_identifier ("selected_int_kind"), gfc_int4_type_node, 1, pvoid_type_node); gfor_fndecl_sr_kind = gfc_build_library_function_decl (get_identifier ("selected_real_kind"), gfc_int4_type_node, 2, pvoid_type_node, pvoid_type_node); /* Power functions. */ { tree type; tree itype; int kind; int ikind; static int kinds[2] = {4, 8}; char name[PREFIX_LEN + 10]; /* _gfortran_pow_?n_?n */ for (ikind=0; ikind < 2; ikind++) { itype = gfc_get_int_type (kinds[ikind]); for (kind = 0; kind < 2; kind ++) { type = gfc_get_int_type (kinds[kind]); sprintf(name, PREFIX("pow_i%d_i%d"), kinds[kind], kinds[ikind]); gfor_fndecl_math_powi[kind][ikind].integer = gfc_build_library_function_decl (get_identifier (name), type, 2, type, itype); type = gfc_get_real_type (kinds[kind]); sprintf(name, PREFIX("pow_r%d_i%d"), kinds[kind], kinds[ikind]); gfor_fndecl_math_powi[kind][ikind].real = gfc_build_library_function_decl (get_identifier (name), type, 2, type, itype); type = gfc_get_complex_type (kinds[kind]); sprintf(name, PREFIX("pow_c%d_i%d"), kinds[kind], kinds[ikind]); gfor_fndecl_math_powi[kind][ikind].cmplx = gfc_build_library_function_decl (get_identifier (name), type, 2, type, itype); } } } gfor_fndecl_math_cpowf = gfc_build_library_function_decl (get_identifier ("cpowf"), gfc_complex4_type_node, 1, gfc_complex4_type_node); gfor_fndecl_math_cpow = gfc_build_library_function_decl (get_identifier ("cpow"), gfc_complex8_type_node, 1, gfc_complex8_type_node); gfor_fndecl_math_ishftc4 = gfc_build_library_function_decl (get_identifier (PREFIX("ishftc4")), gfc_int4_type_node, 3, gfc_int4_type_node, gfc_int4_type_node, gfc_int4_type_node); gfor_fndecl_math_ishftc8 = gfc_build_library_function_decl (get_identifier (PREFIX("ishftc8")), gfc_int8_type_node, 3, gfc_int8_type_node, gfc_int8_type_node, gfc_int8_type_node); gfor_fndecl_math_exponent4 = gfc_build_library_function_decl (get_identifier (PREFIX("exponent_r4")), gfc_int4_type_node, 1, gfc_real4_type_node); gfor_fndecl_math_exponent8 = gfc_build_library_function_decl (get_identifier (PREFIX("exponent_r8")), gfc_int4_type_node, 1, gfc_real8_type_node); /* Other functions. */ gfor_fndecl_size0 = gfc_build_library_function_decl (get_identifier (PREFIX("size0")), gfc_array_index_type, 1, pvoid_type_node); gfor_fndecl_size1 = gfc_build_library_function_decl (get_identifier (PREFIX("size1")), gfc_array_index_type, 2, pvoid_type_node, gfc_array_index_type); gfor_fndecl_iargc = gfc_build_library_function_decl (get_identifier (PREFIX ("iargc")), gfc_int4_type_node, 0); } /* Make prototypes for runtime library functions. */ void gfc_build_builtin_function_decls (void) { tree gfc_int4_type_node = gfc_get_int_type (4); tree gfc_int8_type_node = gfc_get_int_type (8); tree gfc_logical4_type_node = gfc_get_logical_type (4); tree gfc_pint4_type_node = build_pointer_type (gfc_int4_type_node); /* Treat these two internal malloc wrappers as malloc. */ gfor_fndecl_internal_malloc = gfc_build_library_function_decl (get_identifier (PREFIX("internal_malloc")), pvoid_type_node, 1, gfc_int4_type_node); DECL_IS_MALLOC (gfor_fndecl_internal_malloc) = 1; gfor_fndecl_internal_malloc64 = gfc_build_library_function_decl (get_identifier (PREFIX("internal_malloc64")), pvoid_type_node, 1, gfc_int8_type_node); DECL_IS_MALLOC (gfor_fndecl_internal_malloc64) = 1; gfor_fndecl_internal_free = gfc_build_library_function_decl (get_identifier (PREFIX("internal_free")), void_type_node, 1, pvoid_type_node); gfor_fndecl_allocate = gfc_build_library_function_decl (get_identifier (PREFIX("allocate")), void_type_node, 2, ppvoid_type_node, gfc_int4_type_node); gfor_fndecl_allocate64 = gfc_build_library_function_decl (get_identifier (PREFIX("allocate64")), void_type_node, 2, ppvoid_type_node, gfc_int8_type_node); gfor_fndecl_deallocate = gfc_build_library_function_decl (get_identifier (PREFIX("deallocate")), void_type_node, 2, ppvoid_type_node, gfc_pint4_type_node); gfor_fndecl_stop_numeric = gfc_build_library_function_decl (get_identifier (PREFIX("stop_numeric")), void_type_node, 1, gfc_int4_type_node); /* Stop doesn't return. */ TREE_THIS_VOLATILE (gfor_fndecl_stop_numeric) = 1; gfor_fndecl_stop_string = gfc_build_library_function_decl (get_identifier (PREFIX("stop_string")), void_type_node, 2, pchar_type_node, gfc_int4_type_node); /* Stop doesn't return. */ TREE_THIS_VOLATILE (gfor_fndecl_stop_string) = 1; gfor_fndecl_pause_numeric = gfc_build_library_function_decl (get_identifier (PREFIX("pause_numeric")), void_type_node, 1, gfc_int4_type_node); gfor_fndecl_pause_string = gfc_build_library_function_decl (get_identifier (PREFIX("pause_string")), void_type_node, 2, pchar_type_node, gfc_int4_type_node); gfor_fndecl_select_string = gfc_build_library_function_decl (get_identifier (PREFIX("select_string")), pvoid_type_node, 0); gfor_fndecl_runtime_error = gfc_build_library_function_decl (get_identifier (PREFIX("runtime_error")), void_type_node, 3, pchar_type_node, pchar_type_node, gfc_int4_type_node); /* The runtime_error function does not return. */ TREE_THIS_VOLATILE (gfor_fndecl_runtime_error) = 1; gfor_fndecl_set_std = gfc_build_library_function_decl (get_identifier (PREFIX("set_std")), void_type_node, 2, gfc_int4_type_node, gfc_int4_type_node); gfor_fndecl_in_pack = gfc_build_library_function_decl ( get_identifier (PREFIX("internal_pack")), pvoid_type_node, 1, pvoid_type_node); gfor_fndecl_in_unpack = gfc_build_library_function_decl ( get_identifier (PREFIX("internal_unpack")), pvoid_type_node, 1, pvoid_type_node); gfor_fndecl_associated = gfc_build_library_function_decl ( get_identifier (PREFIX("associated")), gfc_logical4_type_node, 2, ppvoid_type_node, ppvoid_type_node); gfc_build_intrinsic_function_decls (); gfc_build_intrinsic_lib_fndecls (); gfc_build_io_library_fndecls (); } /* Evaluate the length of dummy character variables. */ static tree gfc_trans_dummy_character (gfc_charlen * cl, tree fnbody) { stmtblock_t body; gfc_finish_decl (cl->backend_decl, NULL_TREE); gfc_start_block (&body); /* Evaluate the string length expression. */ gfc_trans_init_string_length (cl, &body); gfc_add_expr_to_block (&body, fnbody); return gfc_finish_block (&body); } /* Allocate and cleanup an automatic character variable. */ static tree gfc_trans_auto_character_variable (gfc_symbol * sym, tree fnbody) { stmtblock_t body; tree decl; tree tmp; gcc_assert (sym->backend_decl); gcc_assert (sym->ts.cl && sym->ts.cl->length); gfc_start_block (&body); /* Evaluate the string length expression. */ gfc_trans_init_string_length (sym->ts.cl, &body); decl = sym->backend_decl; /* Emit a DECL_EXPR for this variable, which will cause the gimplifier to allocate storage, and all that good stuff. */ tmp = build1 (DECL_EXPR, TREE_TYPE (decl), decl); gfc_add_expr_to_block (&body, tmp); gfc_add_expr_to_block (&body, fnbody); return gfc_finish_block (&body); } /* Generate function entry and exit code, and add it to the function body. This includes: Allocation and initialization of array variables. Allocation of character string variables. Initialization and possibly repacking of dummy arrays. */ static tree gfc_trans_deferred_vars (gfc_symbol * proc_sym, tree fnbody) { locus loc; gfc_symbol *sym; /* Deal with implicit return variables. Explicit return variables will already have been added. */ if (gfc_return_by_reference (proc_sym) && proc_sym->result == proc_sym) { if (!current_fake_result_decl) { gfc_entry_list *el = NULL; if (proc_sym->attr.entry_master) { for (el = proc_sym->ns->entries; el; el = el->next) if (el->sym != el->sym->result) break; } if (el == NULL) warning (0, "Function does not return a value"); } else if (proc_sym->as) { fnbody = gfc_trans_dummy_array_bias (proc_sym, current_fake_result_decl, fnbody); } else if (proc_sym->ts.type == BT_CHARACTER) { if (TREE_CODE (proc_sym->ts.cl->backend_decl) == VAR_DECL) fnbody = gfc_trans_dummy_character (proc_sym->ts.cl, fnbody); } else gcc_assert (gfc_option.flag_f2c && proc_sym->ts.type == BT_COMPLEX); } for (sym = proc_sym->tlink; sym != proc_sym; sym = sym->tlink) { if (sym->attr.dimension) { switch (sym->as->type) { case AS_EXPLICIT: if (sym->attr.dummy || sym->attr.result) fnbody = gfc_trans_dummy_array_bias (sym, sym->backend_decl, fnbody); else if (sym->attr.pointer || sym->attr.allocatable) { if (TREE_STATIC (sym->backend_decl)) gfc_trans_static_array_pointer (sym); else fnbody = gfc_trans_deferred_array (sym, fnbody); } else { gfc_get_backend_locus (&loc); gfc_set_backend_locus (&sym->declared_at); fnbody = gfc_trans_auto_array_allocation (sym->backend_decl, sym, fnbody); gfc_set_backend_locus (&loc); } break; case AS_ASSUMED_SIZE: /* Must be a dummy parameter. */ gcc_assert (sym->attr.dummy); /* We should always pass assumed size arrays the g77 way. */ fnbody = gfc_trans_g77_array (sym, fnbody); break; case AS_ASSUMED_SHAPE: /* Must be a dummy parameter. */ gcc_assert (sym->attr.dummy); fnbody = gfc_trans_dummy_array_bias (sym, sym->backend_decl, fnbody); break; case AS_DEFERRED: fnbody = gfc_trans_deferred_array (sym, fnbody); break; default: gcc_unreachable (); } } else if (sym->ts.type == BT_CHARACTER) { gfc_get_backend_locus (&loc); gfc_set_backend_locus (&sym->declared_at); if (sym->attr.dummy || sym->attr.result) fnbody = gfc_trans_dummy_character (sym->ts.cl, fnbody); else fnbody = gfc_trans_auto_character_variable (sym, fnbody); gfc_set_backend_locus (&loc); } else gcc_unreachable (); } return fnbody; } /* Output an initialized decl for a module variable. */ static void gfc_create_module_variable (gfc_symbol * sym) { tree decl; /* Only output symbols from this module. */ if (sym->ns != module_namespace) { /* I don't think this should ever happen. */ internal_error ("module symbol %s in wrong namespace", sym->name); } /* Only output variables and array valued parameters. */ if (sym->attr.flavor != FL_VARIABLE && (sym->attr.flavor != FL_PARAMETER || sym->attr.dimension == 0)) return; /* Don't generate variables from other modules. Variables from COMMONs will already have been generated. */ if (sym->attr.use_assoc || sym->attr.in_common) return; if (sym->backend_decl) internal_error ("backend decl for module variable %s already exists", sym->name); /* We always want module variables to be created. */ sym->attr.referenced = 1; /* Create the decl. */ decl = gfc_get_symbol_decl (sym); /* Create the variable. */ pushdecl (decl); rest_of_decl_compilation (decl, 1, 0); /* Also add length of strings. */ if (sym->ts.type == BT_CHARACTER) { tree length; length = sym->ts.cl->backend_decl; if (!INTEGER_CST_P (length)) { pushdecl (length); rest_of_decl_compilation (length, 1, 0); } } } /* Generate all the required code for module variables. */ void gfc_generate_module_vars (gfc_namespace * ns) { module_namespace = ns; /* Check if the frontend left the namespace in a reasonable state. */ gcc_assert (ns->proc_name && !ns->proc_name->tlink); /* Generate COMMON blocks. */ gfc_trans_common (ns); /* Create decls for all the module variables. */ gfc_traverse_ns (ns, gfc_create_module_variable); } static void gfc_generate_contained_functions (gfc_namespace * parent) { gfc_namespace *ns; /* We create all the prototypes before generating any code. */ for (ns = parent->contained; ns; ns = ns->sibling) { /* Skip namespaces from used modules. */ if (ns->parent != parent) continue; gfc_create_function_decl (ns); } for (ns = parent->contained; ns; ns = ns->sibling) { /* Skip namespaces from used modules. */ if (ns->parent != parent) continue; gfc_generate_function_code (ns); } } /* Generate decls for all local variables. We do this to ensure correct handling of expressions which only appear in the specification of other functions. */ static void generate_local_decl (gfc_symbol * sym) { if (sym->attr.flavor == FL_VARIABLE) { if (sym->attr.referenced) gfc_get_symbol_decl (sym); else if (sym->attr.dummy && warn_unused_parameter) warning (0, "unused parameter %qs", sym->name); /* Warn for unused variables, but not if they're inside a common block or are use-associated. */ else if (warn_unused_variable && !(sym->attr.in_common || sym->attr.use_assoc)) warning (0, "unused variable %qs", sym->name); } } static void generate_local_vars (gfc_namespace * ns) { gfc_traverse_ns (ns, generate_local_decl); } /* Generate a switch statement to jump to the correct entry point. Also creates the label decls for the entry points. */ static tree gfc_trans_entry_master_switch (gfc_entry_list * el) { stmtblock_t block; tree label; tree tmp; tree val; gfc_init_block (&block); for (; el; el = el->next) { /* Add the case label. */ label = gfc_build_label_decl (NULL_TREE); val = build_int_cst (gfc_array_index_type, el->id); tmp = build3_v (CASE_LABEL_EXPR, val, NULL_TREE, label); gfc_add_expr_to_block (&block, tmp); /* And jump to the actual entry point. */ label = gfc_build_label_decl (NULL_TREE); tmp = build1_v (GOTO_EXPR, label); gfc_add_expr_to_block (&block, tmp); /* Save the label decl. */ el->label = label; } tmp = gfc_finish_block (&block); /* The first argument selects the entry point. */ val = DECL_ARGUMENTS (current_function_decl); tmp = build3_v (SWITCH_EXPR, val, tmp, NULL_TREE); return tmp; } /* Generate code for a function. */ void gfc_generate_function_code (gfc_namespace * ns) { tree fndecl; tree old_context; tree decl; tree tmp; stmtblock_t block; stmtblock_t body; tree result; gfc_symbol *sym; sym = ns->proc_name; /* Check that the frontend isn't still using this. */ gcc_assert (sym->tlink == NULL); sym->tlink = sym; /* Create the declaration for functions with global scope. */ if (!sym->backend_decl) gfc_create_function_decl (ns); fndecl = sym->backend_decl; old_context = current_function_decl; if (old_context) { push_function_context (); saved_parent_function_decls = saved_function_decls; saved_function_decls = NULL_TREE; } trans_function_start (sym); /* Will be created as needed. */ current_fake_result_decl = NULL_TREE; gfc_start_block (&block); gfc_generate_contained_functions (ns); if (ns->entries && ns->proc_name->ts.type == BT_CHARACTER) { /* Copy length backend_decls to all entry point result symbols. */ gfc_entry_list *el; tree backend_decl; gfc_conv_const_charlen (ns->proc_name->ts.cl); backend_decl = ns->proc_name->result->ts.cl->backend_decl; for (el = ns->entries; el; el = el->next) el->sym->result->ts.cl->backend_decl = backend_decl; } /* Translate COMMON blocks. */ gfc_trans_common (ns); generate_local_vars (ns); current_function_return_label = NULL; /* Now generate the code for the body of this function. */ gfc_init_block (&body); /* If this is the main program and we compile with -pedantic, add a call to set_std to set up the runtime library Fortran language standard parameters. */ if (sym->attr.is_main_program && pedantic) { tree arglist, gfc_int4_type_node; gfc_int4_type_node = gfc_get_int_type (4); arglist = gfc_chainon_list (NULL_TREE, build_int_cst (gfc_int4_type_node, gfc_option.warn_std)); arglist = gfc_chainon_list (arglist, build_int_cst (gfc_int4_type_node, gfc_option.allow_std)); tmp = gfc_build_function_call (gfor_fndecl_set_std, arglist); gfc_add_expr_to_block (&body, tmp); } if (TREE_TYPE (DECL_RESULT (fndecl)) != void_type_node && sym->attr.subroutine) { tree alternate_return; alternate_return = gfc_get_fake_result_decl (sym); gfc_add_modify_expr (&body, alternate_return, integer_zero_node); } if (ns->entries) { /* Jump to the correct entry point. */ tmp = gfc_trans_entry_master_switch (ns->entries); gfc_add_expr_to_block (&body, tmp); } tmp = gfc_trans_code (ns->code); gfc_add_expr_to_block (&body, tmp); /* Add a return label if needed. */ if (current_function_return_label) { tmp = build1_v (LABEL_EXPR, current_function_return_label); gfc_add_expr_to_block (&body, tmp); } tmp = gfc_finish_block (&body); /* Add code to create and cleanup arrays. */ tmp = gfc_trans_deferred_vars (sym, tmp); gfc_add_expr_to_block (&block, tmp); if (TREE_TYPE (DECL_RESULT (fndecl)) != void_type_node) { if (sym->attr.subroutine || sym == sym->result) { result = current_fake_result_decl; current_fake_result_decl = NULL_TREE; } else result = sym->result->backend_decl; if (result == NULL_TREE) warning (0, "Function return value not set"); else { /* Set the return value to the dummy result variable. */ tmp = build2 (MODIFY_EXPR, TREE_TYPE (result), DECL_RESULT (fndecl), result); tmp = build1_v (RETURN_EXPR, tmp); gfc_add_expr_to_block (&block, tmp); } } /* Add all the decls we created during processing. */ decl = saved_function_decls; while (decl) { tree next; next = TREE_CHAIN (decl); TREE_CHAIN (decl) = NULL_TREE; pushdecl (decl); decl = next; } saved_function_decls = NULL_TREE; DECL_SAVED_TREE (fndecl) = gfc_finish_block (&block); /* Finish off this function and send it for code generation. */ poplevel (1, 0, 1); BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl; /* Output the GENERIC tree. */ dump_function (TDI_original, fndecl); /* Store the end of the function, so that we get good line number info for the epilogue. */ cfun->function_end_locus = input_location; /* We're leaving the context of this function, so zap cfun. It's still in DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */ cfun = NULL; if (old_context) { pop_function_context (); saved_function_decls = saved_parent_function_decls; } current_function_decl = old_context; if (decl_function_context (fndecl)) /* Register this function with cgraph just far enough to get it added to our parent's nested function list. */ (void) cgraph_node (fndecl); else { gfc_gimplify_function (fndecl); cgraph_finalize_function (fndecl, false); } } void gfc_generate_constructors (void) { gcc_assert (gfc_static_ctors == NULL_TREE); #if 0 tree fnname; tree type; tree fndecl; tree decl; tree tmp; if (gfc_static_ctors == NULL_TREE) return; fnname = get_file_function_name ('I'); type = build_function_type (void_type_node, gfc_chainon_list (NULL_TREE, void_type_node)); fndecl = build_decl (FUNCTION_DECL, fnname, type); TREE_PUBLIC (fndecl) = 1; decl = build_decl (RESULT_DECL, NULL_TREE, void_type_node); DECL_ARTIFICIAL (decl) = 1; DECL_IGNORED_P (decl) = 1; DECL_CONTEXT (decl) = fndecl; DECL_RESULT (fndecl) = decl; pushdecl (fndecl); current_function_decl = fndecl; rest_of_decl_compilation (fndecl, 1, 0); make_decl_rtl (fndecl); init_function_start (fndecl); pushlevel (0); for (; gfc_static_ctors; gfc_static_ctors = TREE_CHAIN (gfc_static_ctors)) { tmp = gfc_build_function_call (TREE_VALUE (gfc_static_ctors), NULL_TREE); DECL_SAVED_TREE (fndecl) = build_stmt (EXPR_STMT, tmp); } poplevel (1, 0, 1); BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl; free_after_parsing (cfun); free_after_compilation (cfun); tree_rest_of_compilation (fndecl); current_function_decl = NULL_TREE; #endif } /* Translates a BLOCK DATA program unit. This means emitting the commons contained therein plus their initializations. We also emit a globally visible symbol to make sure that each BLOCK DATA program unit remains unique. */ void gfc_generate_block_data (gfc_namespace * ns) { tree decl; tree id; /* Tell the backend the source location of the block data. */ if (ns->proc_name) gfc_set_backend_locus (&ns->proc_name->declared_at); else gfc_set_backend_locus (&gfc_current_locus); /* Process the DATA statements. */ gfc_trans_common (ns); /* Create a global symbol with the mane of the block data. This is to generate linker errors if the same name is used twice. It is never really used. */ if (ns->proc_name) id = gfc_sym_mangled_function_id (ns->proc_name); else id = get_identifier ("__BLOCK_DATA__"); decl = build_decl (VAR_DECL, id, gfc_array_index_type); TREE_PUBLIC (decl) = 1; TREE_STATIC (decl) = 1; pushdecl (decl); rest_of_decl_compilation (decl, 1, 0); } #include "gt-fortran-trans-decl.h"