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Diffstat (limited to 'gcc/fortran/trans-decl.c')
| -rw-r--r-- | gcc/fortran/trans-decl.c | 2137 |
1 files changed, 2137 insertions, 0 deletions
diff --git a/gcc/fortran/trans-decl.c b/gcc/fortran/trans-decl.c new file mode 100644 index 0000000..79e8cf6 --- /dev/null +++ b/gcc/fortran/trans-decl.c @@ -0,0 +1,2137 @@ +/* Backend function setup + Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. + Contributed by Paul Brook + +This file is part of GNU G95. + +GNU G95 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. + +GNU G95 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 GNU G95; see the file COPYING. If not, write to +the Free Software Foundation, 59 Temple Place - Suite 330, +Boston, MA 02111-1307, 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-simple.h" +#include "ggc.h" +#include "toplev.h" +#include "tm.h" +#include "target.h" +#include "function.h" +#include "errors.h" +#include "flags.h" +#include "cgraph.h" +#include <assert.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_in_pack; +tree gfor_fndecl_in_unpack; +tree gfor_fndecl_associated; + + +/* Math functions. Many other math functions are handled in + trans-intrinsic.c. */ + +tree gfor_fndecl_math_powf; +tree gfor_fndecl_math_pow; +tree gfor_fndecl_math_cpowf; +tree gfor_fndecl_math_cpow; +tree gfor_fndecl_math_cabsf; +tree gfor_fndecl_math_cabs; +tree gfor_fndecl_math_sign4; +tree gfor_fndecl_math_sign8; +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; + +/* 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) +{ + 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) +{ + 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 lables. For artificial labels it's up to the + caller to mark the label as used. */ + +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; + + if (label_name) + { + DECL_ARTIFICIAL (label_decl) = 1; + } + else + { + /* 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; + } + + 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; +} + + +/* 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. */ + 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 */ + { + DECL_SOURCE_LINE (label_decl) = lp->where.line; + DECL_SOURCE_FILE (label_decl) = lp->where.file->filename; + } + 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[0] == 0) + 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[0] == 0 || sym->attr.proc == PROC_EXTERNAL + || (sym->module[0] != 0 && 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); + } +} + + +/* 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) + 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) + assert (DECL_INITIAL (decl) == NULL_TREE); + else + 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 acualy 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[0] && !sym->attr.result) + { + /* TODO: Don't set sym->module for result variables. */ + 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; + + 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 unkown 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 preform + 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); + 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. */ + 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. */ + 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; + + 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_strlen_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; + gfc_se se; + int byref; + + 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); + } + + /* Dummy variables should already have been created. */ + 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; + + if (sym->attr.entry) + gfc_todo_error ("alternate entry"); + + /* 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)); + + /* Symbols from modules have its assembler name should be mangled. + This is done here rather than in gfc_finish_var_decl because it + is different for string length variables. */ + if (sym->module[0]) + 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_strlen_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_2 (-2, -1); + } + + /* TODO: Initialization of pointer variables. */ + switch (sym->ts.type) + { + case BT_CHARACTER: + /* Character variables need special handling. */ + gfc_allocate_lang_decl (decl); + + if (TREE_CODE (length) == INTEGER_CST) + { + /* Static initializer for string scalars. + Initialization of string arrays is handled elsewhere. */ + if (sym->value && sym->attr.dimension == 0) + { + assert (TREE_STATIC (decl)); + if (sym->attr.pointer) + gfc_todo_error ("initialization of character pointers"); + DECL_INITIAL (decl) = gfc_conv_string_init (length, sym->value); + } + } + else + { + char name[GFC_MAX_MANGLED_SYMBOL_LEN + 2]; + + if (sym->module[0]) + { + /* 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); + assert (!sym->value); + } + break; + + case BT_DERIVED: + if (sym->value && ! (sym->attr.use_assoc || sym->attr.dimension)) + { + gfc_init_se (&se, NULL); + gfc_conv_structure (&se, sym->value, 1); + DECL_INITIAL (decl) = se.expr; + } + break; + + default: + /* Static initializers for SAVEd variables. Arrays have already been + remembered. Module variables are initialized when the module is + loaded. */ + if (sym->value && ! (sym->attr.use_assoc || sym->attr.dimension)) + { + assert (TREE_STATIC (decl)); + gfc_init_se (&se, NULL); + gfc_conv_constant (&se, sym->value); + DECL_INITIAL (decl) = se.expr; + } + break; + } + sym->backend_decl = decl; + + return 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]; + tree name; + tree mangled_name; + + if (sym->backend_decl) + return sym->backend_decl; + + 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); + assert (isym->resolve.f0 != NULL); + + memset (&e, 0, sizeof (e)); + e.expr_type = EXPR_FUNCTION; + + memset (&argexpr, 0, sizeof (argexpr)); + 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. */ + assert (isym->formal->next->next == NULL); + isym->resolve.f2 (&e, &argexpr, NULL); + } + 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, eg. intrinsic subroutine. */ + DECL_CONTEXT (fndecl) = NULL_TREE; + } + + DECL_EXTERNAL (fndecl) = 1; + + /* This specifies if a function is globaly addressable, ie. 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) + { + DECL_IS_PURE (fndecl) = 1; +/* TODO: check if pure/elemental procedures can have INTENT(OUT) parameters. + 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. */ + +void +gfc_build_function_decl (gfc_symbol * sym) +{ + tree fndecl, type, result_decl, typelist, arglist; + tree length; + symbol_attribute attr; + gfc_formal_arglist *f; + + assert (!sym->backend_decl); + assert (!sym->attr.external); + + /* Allow only one nesting level. Allow public declarations. */ + 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 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_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 globaly addressable, ie. it is + the opposite of decalring static in C. */ + if (DECL_CONTEXT (fndecl) == NULL_TREE || attr.external) + TREE_PUBLIC (fndecl) = 1; + + /* TREE_STATIC means the function body is defined here. */ + if (!attr.external) + TREE_STATIC (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 (attr.pure || attr.elemental) + { + 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. */ + if (!attr.external) + { + tree parm; + + pushdecl (fndecl); + /* Build formal argument list. Make sure that their TREE_CONTEXT is + the new FUNCTION_DECL node. */ + current_function_decl = fndecl; + arglist = NULL_TREE; + typelist = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); + 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; + 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); + assert (type == gfc_strlen_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; + } + 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; + 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; + DECL_ARG_TYPE_AS_WRITTEN (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); + assert (type == gfc_strlen_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_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; + f->sym->ts.cl->backend_decl = length; + } + + parm = TREE_CHAIN (parm); + typelist = TREE_CHAIN (typelist); + } + + assert (TREE_VALUE (typelist) == void_type_node); + DECL_ARGUMENTS (fndecl) = arglist; + + /* Restore the old context. */ + current_function_decl = DECL_CONTEXT (fndecl); + } + sym->backend_decl = fndecl; +} + + +/* 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 (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 (sym->backend_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. */ + 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, NULL, 1, 0); + + return fndecl; +} + +static void +gfc_build_intrinsic_function_decls (void) +{ + /* String functions. */ + gfor_fndecl_copy_string = + gfc_build_library_function_decl (get_identifier (PREFIX("copy_string")), + void_type_node, + 4, + gfc_strlen_type_node, pchar_type_node, + gfc_strlen_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_strlen_type_node, pchar_type_node, + gfc_strlen_type_node, pchar_type_node); + + gfor_fndecl_concat_string = + gfc_build_library_function_decl (get_identifier (PREFIX("concat_string")), + void_type_node, + 6, + gfc_strlen_type_node, pchar_type_node, + gfc_strlen_type_node, pchar_type_node, + gfc_strlen_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_strlen_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_strlen_type_node, pchar_type_node, + gfc_strlen_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_strlen_type_node, pchar_type_node, + gfc_strlen_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_strlen_type_node, pchar_type_node, + gfc_strlen_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_strlen_type_node), + ppvoid_type_node, + gfc_strlen_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_strlen_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_strlen_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_strlen_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. */ + gfor_fndecl_math_powf = + gfc_build_library_function_decl (get_identifier ("powf"), + gfc_real4_type_node, + 1, gfc_real4_type_node); + gfor_fndecl_math_pow = + gfc_build_library_function_decl (get_identifier ("pow"), + gfc_real8_type_node, + 1, gfc_real8_type_node); + 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_cabsf = + gfc_build_library_function_decl (get_identifier ("cabsf"), + gfc_real4_type_node, + 1, gfc_complex4_type_node); + gfor_fndecl_math_cabs = + gfc_build_library_function_decl (get_identifier ("cabs"), + gfc_real8_type_node, + 1, gfc_complex8_type_node); + gfor_fndecl_math_sign4 = + gfc_build_library_function_decl (get_identifier ("copysignf"), + gfc_real4_type_node, + 1, gfc_real4_type_node); + gfor_fndecl_math_sign8 = + gfc_build_library_function_decl (get_identifier ("copysign"), + gfc_real8_type_node, + 1, gfc_real8_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); +} + + +/* Make prototypes for runtime library functions. */ + +void +gfc_build_builtin_function_decls (void) +{ + gfor_fndecl_internal_malloc = + gfc_build_library_function_decl (get_identifier (PREFIX("internal_malloc")), + pvoid_type_node, 1, gfc_int4_type_node); + + gfor_fndecl_internal_malloc64 = + gfc_build_library_function_decl (get_identifier + (PREFIX("internal_malloc64")), + pvoid_type_node, 1, gfc_int8_type_node); + + 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, 1, ppvoid_type_node); + + gfor_fndecl_stop_numeric = + gfc_build_library_function_decl (get_identifier (PREFIX("stop_numeric")), + void_type_node, 1, gfc_int4_type_node); + + 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); + + 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); + + 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 (); +} + + +/* Exaluate 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 args; + tree tmp; + + assert (sym->backend_decl); + 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; + + DECL_DEFER_OUTPUT (decl) = 1; + + /* Generate code to allocate the automatic variable. It will be freed + automatically. */ + tmp = gfc_build_addr_expr (NULL, decl); + args = gfc_chainon_list (NULL_TREE, tmp); + args = gfc_chainon_list (args, sym->ts.cl->backend_decl); + tmp = gfc_build_function_call (built_in_decls[BUILT_IN_STACK_ALLOC], args); + 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 initialisation 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) + { + warning ("Function does not return a value"); + return fnbody; + } + + 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 + gfc_todo_error ("Deferred non-array return by reference"); + } + + 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. */ + assert (sym->attr.dummy); + + /* We should always pass assumed size arrays the g77 way. */ + assert (TREE_CODE (sym->backend_decl) == PARM_DECL); + fnbody = gfc_trans_g77_array (sym, fnbody); + break; + + case AS_ASSUMED_SHAPE: + /* Must be a dummy parameter. */ + 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: + abort (); + } + } + 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 + abort (); + } + + return fnbody; +} + + +/* Output an initialized decl for a module variable. */ + +static void +gfc_create_module_variable (gfc_symbol * sym) +{ + tree decl; + gfc_se se; + + /* 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); + } + + /* Don't ouptut symbols from common blocks. */ + if (sym->attr.common) + return; + + /* Only output variables and array valued parametes. */ + if (sym->attr.flavor != FL_VARIABLE + && (sym->attr.flavor != FL_PARAMETER || sym->attr.dimension == 0)) + return; + + /* Don't generate variables from other modules. */ + if (sym->attr.use_assoc) + 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); + + /* We want to allocate storage for this variable. */ + TREE_STATIC (decl) = 1; + + if (sym->attr.dimension) + { + assert (sym->attr.pointer || sym->attr.allocatable + || GFC_ARRAY_TYPE_P (TREE_TYPE (sym->backend_decl))); + if (sym->attr.pointer || sym->attr.allocatable) + gfc_trans_static_array_pointer (sym); + else + gfc_trans_auto_array_allocation (sym->backend_decl, sym, NULL_TREE); + } + else if (sym->ts.type == BT_DERIVED) + { + if (sym->value) + gfc_todo_error ("Initialization of derived type module variables"); + } + else + { + if (sym->value) + { + gfc_init_se (&se, NULL); + gfc_conv_constant (&se, sym->value); + DECL_INITIAL (decl) = se.expr; + } + } + + /* Create the variable. */ + pushdecl (decl); + rest_of_decl_compilation (decl, NULL, 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, NULL, 1, 0); + } + } +} + + +/* Generate all the required code for module variables. */ + +void +gfc_generate_module_vars (gfc_namespace * ns) +{ + module_namespace = ns; + + /* Check the frontend left the namespace in a reasonable state. */ + assert (ns->proc_name && !ns->proc_name->tlink); + + /* Create decls for all the module varuiables. */ + 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_build_function_decl (ns->proc_name); + } + + 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) + { + /* TODO: The frontend sometimes creates symbols for things which don't + actually exist. E.g. common block names and the names of formal + arguments. The latter are created while attempting to parse + the argument list as a substring reference. + + The proper fix is to avoid adding these symbols in the first place. + For now we hack round it by ignoring anything with an unknown type. + */ + if (sym->ts.type == BT_UNKNOWN) + return; + + if (sym->attr.referenced) + gfc_get_symbol_decl (sym); + else if (sym->attr.dummy) + { + if (warn_unused_parameter) + warning ("unused parameter `%s'", sym->name); + } + else if (warn_unused_variable) + warning ("unused variable `%s'", sym->name); + } +} + +static void +generate_local_vars (gfc_namespace * ns) +{ + gfc_traverse_ns (ns, generate_local_decl); +} + + +/* Finalize DECL and all nested functions with cgraph. */ + +static void +gfc_finalize (tree decl) +{ + struct cgraph_node *cgn; + + cgn = cgraph_node (decl); + for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested) + gfc_finalize (cgn->decl); + + cgraph_finalize_function (decl, false); +} + +/* 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. */ + assert (sym->tlink == NULL); + + sym->tlink = sym; + + /* Create the declaration for functions with global scope. */ + if (!sym->backend_decl) + gfc_build_function_decl (ns->proc_name); + + 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; + } + + /* let GCC know the current scope is this function */ + current_function_decl = fndecl; + + /* print function name on the console at compile time + (unless this feature was switched of by command line option "-quiet" */ + announce_function (fndecl); + + if (DECL_CONTEXT (fndecl) == NULL_TREE) + { + /* create RTL for function declaration */ + rest_of_decl_compilation (fndecl, NULL, 1, 0); + } + + /* create RTL for function definition */ + make_decl_rtl (fndecl, NULL); + + /* Set the line and filename. sym->decalred_at seems to point to the last + statement for subroutines, but it'll do for now. */ + gfc_set_backend_locus (&sym->declared_at); + + /* line and file should not be 0 */ + init_function_start (fndecl); + + /* We're in function-at-a-time mode. */ + cfun->x_whole_function_mode_p = 1; + + /* 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. */ + immediate_size_expand = 0; + cfun->x_dont_save_pending_sizes_p = 1; + + /* Will be created as needed. */ + current_fake_result_decl = NULL_TREE; + + /* function.c requires a push at the start of the function */ + pushlevel (0); + + gfc_start_block (&block); + + gfc_generate_contained_functions (ns); + + /* 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 (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); + } + + 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 ("Function return value not set"); + else + { + /* Set the return value to the the dummy result variable. */ + tmp = build (MODIFY_EXPR, TREE_TYPE (result), + DECL_RESULT (fndecl), result); + tmp = build_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); + + /* Lowering nested functions requires gimple input. */ + gimplify_function_tree (fndecl); + } + else + { + if (cgraph_node (fndecl)->nested) + { + gimplify_function_tree (fndecl); + lower_nested_functions (fndecl); + } + gfc_finalize (fndecl); + } +} + + +void +gfc_generate_constructors (void) +{ + if (gfc_static_ctors != NULL_TREE) + abort (); +#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_CONTEXT (decl) = fndecl; + DECL_RESULT (fndecl) = decl; + + pushdecl (fndecl); + + current_function_decl = fndecl; + + rest_of_decl_compilation (fndecl, NULL, 1, 0); + + make_decl_rtl (fndecl, NULL); + + init_function_start (fndecl, input_filename, input_line); + + cfun->x_whole_function_mode_p = 1; + + immediate_size_expand = 0; + + 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, 0); + + current_function_decl = NULL_TREE; +#endif +} + +#include "gt-fortran-trans-decl.h" |