1 /* Header for code translation functions
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Free Software
4 Contributed by Paul Brook
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
26 /* Mangled symbols take the form __module__name. */
27 #define GFC_MAX_MANGLED_SYMBOL_LEN (GFC_MAX_SYMBOL_LEN*2+4)
29 /* Struct for holding a block of statements. It should be treated as an
30 opaque entity and not modified directly. This allows us to change the
31 underlying representation of statement lists. */
35 unsigned int has_scope
:1;
39 /* a simplified expression */
42 /* Code blocks to be executed before and after using the value. */
46 /* the result of the expression */
49 /* The length of a character string value. */
52 /* If set gfc_conv_variable will return an expression for the array
53 descriptor. When set, want_pointer should also be set.
54 If not set scalarizing variables will be substituted. */
55 unsigned descriptor_only
:1;
57 /* When this is set gfc_conv_expr returns the address of a variable. Only
58 applies to EXPR_VARIABLE nodes.
59 Also used by gfc_conv_array_parameter. When set this indicates a pointer
60 to the descriptor should be returned, rather than the descriptor itself.
62 unsigned want_pointer
:1;
64 /* An array function call returning without a temporary. Also used for array
65 pointer assignments. */
66 unsigned direct_byref
:1;
68 /* Ignore absent optional arguments. Used for some intrinsics. */
69 unsigned ignore_optional
:1;
71 /* When this is set the data and offset fields of the returned descriptor
72 are NULL. Used by intrinsic size. */
73 unsigned data_not_needed
:1;
75 /* If set, gfc_conv_function_call does not put byref calls into se->pre. */
76 unsigned no_function_call
:1;
78 /* Scalarization parameters. */
79 struct gfc_se
*parent
;
81 struct gfc_loopinfo
*loop
;
86 /* Scalarization State chain. Created by walking an expression tree before
87 creating the scalarization loops. Then passed as part of a gfc_se structure
88 to translate the expression inside the loop. Note that these chains are
89 terminated by gfc_se_terminator, not NULL. A NULL pointer in a gfc_se
90 indicates to gfc_conv_* that this is a scalar expression.
91 Note that some member arrays correspond to scalarizer rank and others
92 are the variable rank. */
94 typedef struct gfc_ss_info
97 /* The ref that holds information on this section. */
99 /* The descriptor of this array. */
101 /* holds the pointer to the data array. */
103 /* To move some of the array index calculation out of the innermost loop. */
107 /* Holds the SS for a subscript. Indexed by actual dimension. */
108 struct gfc_ss
*subscript
[GFC_MAX_DIMENSIONS
];
110 /* stride and delta are used to access this inside a scalarization loop.
111 start is used in the calculation of these. Indexed by scalarizer
113 tree start
[GFC_MAX_DIMENSIONS
];
114 tree end
[GFC_MAX_DIMENSIONS
];
115 tree stride
[GFC_MAX_DIMENSIONS
];
116 tree delta
[GFC_MAX_DIMENSIONS
];
118 /* Translation from scalarizer dimensions to actual dimensions.
119 actual = dim[scalarizer] */
120 int dim
[GFC_MAX_DIMENSIONS
];
126 /* A scalar value. This will be evaluated before entering the
127 scalarization loop. */
130 /* Like GFC_SS_SCALAR except it evaluates a pointer to the expression.
131 Used for elemental function parameters. */
134 /* An array section. Scalarization indices will be substituted during
135 expression translation. */
138 /* A non-elemental function call returning an array. The call is executed
139 before entering the scalarization loop, storing the result in a
140 temporary. This temporary is then used inside the scalarization loop.
141 Simple assignments, eg. a(:) = fn() are handles without a temporary
142 as a special case. */
145 /* An array constructor. The current implementation is sub-optimal in
146 many cases. It allocated a temporary, assigns the values to it, then
147 uses this temporary inside the scalarization loop. */
150 /* A vector subscript. The vector's descriptor is cached in the
151 "descriptor" field of the associated gfc_ss_info. */
154 /* A temporary array allocated by the scalarizer. Its rank can be less
155 than that of the assignment expression. */
158 /* An intrinsic function call. Many intrinsic functions which map directly
159 to library calls are created as GFC_SS_FUNCTION nodes. */
162 /* A component of a derived type. */
167 /* SS structures can only belong to a single loopinfo. They must be added
168 otherwise they will not get freed. */
169 typedef struct gfc_ss
177 /* If type is GFC_SS_SCALAR or GFC_SS_REFERENCE. */
187 /* The rank of the temporary. May be less than the rank of the
188 assigned expression. */
193 /* All other types. */
198 /* All the SS in a loop and linked through loop_chain. The SS for an
199 expression are linked by the next pointer. */
200 struct gfc_ss
*loop_chain
;
203 /* This is used by assignments requiring temporaries. The bits specify which
204 loops the terms appear in. This will be 1 for the RHS expressions,
205 2 for the LHS expressions, and 3(=1|2) for the temporary. */
209 #define gfc_get_ss() gfc_getmem(sizeof(gfc_ss))
211 /* The contents of this aren't actually used. A NULL SS chain indicates a
212 scalar expression, so this pointer is used to terminate SS chains. */
213 extern gfc_ss
* const gfc_ss_terminator
;
215 /* Holds information about an expression while it is being scalarized. */
216 typedef struct gfc_loopinfo
223 /* All the SS involved with this loop. */
225 /* The SS describing the temporary used in an assignment. */
228 /* The scalarization loop index variables. */
229 tree loopvar
[GFC_MAX_DIMENSIONS
];
231 /* The bounds of the scalarization loops. */
232 tree from
[GFC_MAX_DIMENSIONS
];
233 tree to
[GFC_MAX_DIMENSIONS
];
234 gfc_ss
*specloop
[GFC_MAX_DIMENSIONS
];
236 /* The code member contains the code for the body of the next outer loop. */
237 stmtblock_t code
[GFC_MAX_DIMENSIONS
];
239 /* Order in which the dimensions should be looped, innermost first. */
240 int order
[GFC_MAX_DIMENSIONS
];
242 /* The number of dimensions for which a temporary is used. */
245 /* If set we don't need the loop variables. */
246 unsigned array_parameter
:1;
251 /* Information about a symbol that has been shadowed by a temporary. */
254 symbol_attribute attr
;
260 /* Advance the SS chain to the next term. */
261 void gfc_advance_se_ss_chain (gfc_se
*);
263 /* Call this to initialize a gfc_se structure before use
264 first parameter is structure to initialize, second is
265 parent to get scalarization data from, or NULL. */
266 void gfc_init_se (gfc_se
*, gfc_se
*);
268 /* Create an artificial variable decl and add it to the current scope. */
269 tree
gfc_create_var (tree
, const char *);
270 /* Like above but doesn't add it to the current scope. */
271 tree
gfc_create_var_np (tree
, const char *);
273 /* Store the result of an expression in a temp variable so it can be used
274 repeatedly even if the original changes */
275 void gfc_make_safe_expr (gfc_se
* se
);
277 /* Makes sure se is suitable for passing as a function string parameter. */
278 void gfc_conv_string_parameter (gfc_se
* se
);
280 /* Compare two strings. */
281 tree
gfc_build_compare_string (tree
, tree
, tree
, tree
);
283 /* Add an item to the end of TREE_LIST. */
284 tree
gfc_chainon_list (tree
, tree
);
286 /* When using the gfc_conv_* make sure you understand what they do, i.e.
287 when a POST chain may be created, and what the returned expression may be
288 used for. Note that character strings have special handling. This
289 should not be a problem as most statements/operations only deal with
290 numeric/logical types. See the implementations in trans-expr.c
291 for details of the individual functions. */
293 void gfc_conv_expr (gfc_se
* se
, gfc_expr
* expr
);
294 void gfc_conv_expr_val (gfc_se
* se
, gfc_expr
* expr
);
295 void gfc_conv_expr_lhs (gfc_se
* se
, gfc_expr
* expr
);
296 void gfc_conv_expr_reference (gfc_se
* se
, gfc_expr
*);
297 void gfc_conv_expr_type (gfc_se
* se
, gfc_expr
*, tree
);
299 /* Find the decl containing the auxiliary variables for assigned variables. */
300 void gfc_conv_label_variable (gfc_se
* se
, gfc_expr
* expr
);
301 /* If the value is not constant, Create a temporary and copy the value. */
302 tree
gfc_evaluate_now (tree
, stmtblock_t
*);
304 /* Intrinsic function handling. */
305 void gfc_conv_intrinsic_function (gfc_se
*, gfc_expr
*);
307 /* Does an intrinsic map directly to an external library call. */
308 int gfc_is_intrinsic_libcall (gfc_expr
*);
310 /* Used to call the elemental subroutines used in operator assignments. */
311 tree
gfc_conv_operator_assign (gfc_se
*, gfc_se
*, gfc_symbol
*);
313 /* Also used to CALL subroutines. */
314 int gfc_conv_function_call (gfc_se
*, gfc_symbol
*, gfc_actual_arglist
*,
317 void gfc_conv_aliased_arg (gfc_se
*, gfc_expr
*, int, sym_intent
);
318 bool is_aliased_array (gfc_expr
*);
320 /* gfc_trans_* shouldn't call push/poplevel, use gfc_push/pop_scope */
322 /* Generate code for a scalar assignment. */
323 tree
gfc_trans_scalar_assign (gfc_se
*, gfc_se
*, gfc_typespec
, bool, bool);
325 /* Translate COMMON blocks. */
326 void gfc_trans_common (gfc_namespace
*);
328 /* Translate a derived type constructor. */
329 void gfc_conv_structure (gfc_se
*, gfc_expr
*, int);
331 /* Return an expression which determines if a dummy parameter is present. */
332 tree
gfc_conv_expr_present (gfc_symbol
*);
333 /* Convert a missing, dummy argument into a null or zero. */
334 void gfc_conv_missing_dummy (gfc_se
*, gfc_expr
*, gfc_typespec
);
336 /* Generate code to allocate a string temporary. */
337 tree
gfc_conv_string_tmp (gfc_se
*, tree
, tree
);
338 /* Get the string length variable belonging to an expression. */
339 tree
gfc_get_expr_charlen (gfc_expr
*);
340 /* Initialize a string length variable. */
341 void gfc_trans_init_string_length (gfc_charlen
*, stmtblock_t
*);
342 /* Ensure type sizes can be gimplified. */
343 void gfc_trans_vla_type_sizes (gfc_symbol
*, stmtblock_t
*);
345 /* Add an expression to the end of a block. */
346 void gfc_add_expr_to_block (stmtblock_t
*, tree
);
347 /* Add a block to the end of a block. */
348 void gfc_add_block_to_block (stmtblock_t
*, stmtblock_t
*);
349 /* Add a MODIFY_EXPR or a GIMPLE_MODIFY_STMT to a block. */
350 void gfc_add_modify (stmtblock_t
*, tree
, tree
, bool);
351 #define gfc_add_modify_expr(BLOCK, LHS, RHS) \
352 gfc_add_modify ((BLOCK), (LHS), (RHS), false)
353 #define gfc_add_modify_stmt(BLOCK, LHS, RHS) \
354 gfc_add_modify ((BLOCK), (LHS), (RHS), true)
356 /* Initialize a statement block. */
357 void gfc_init_block (stmtblock_t
*);
358 /* Start a new statement block. Like gfc_init_block but also starts a new
360 void gfc_start_block (stmtblock_t
*);
361 /* Finish a statement block. Also closes the scope if the block was created
362 with gfc_start_block. */
363 tree
gfc_finish_block (stmtblock_t
*);
364 /* Merge the scope of a block with its parent. */
365 void gfc_merge_block_scope (stmtblock_t
* block
);
367 /* Return the backend label decl. */
368 tree
gfc_get_label_decl (gfc_st_label
*);
370 /* Return the decl for an external function. */
371 tree
gfc_get_extern_function_decl (gfc_symbol
*);
373 /* Return the decl for a function. */
374 tree
gfc_get_function_decl (gfc_symbol
*);
376 /* Build an ADDR_EXPR. */
377 tree
gfc_build_addr_expr (tree
, tree
);
379 /* Build an ARRAY_REF. */
380 tree
gfc_build_array_ref (tree
, tree
);
382 /* Creates a label. Decl is artificial if label_id == NULL_TREE. */
383 tree
gfc_build_label_decl (tree
);
385 /* Return the decl used to hold the function return value.
386 Do not use if the function has an explicit result variable. */
387 tree
gfc_get_fake_result_decl (gfc_symbol
*, int);
389 /* Get the return label for the current function. */
390 tree
gfc_get_return_label (void);
392 /* Add a decl to the binding level for the current function. */
393 void gfc_add_decl_to_function (tree
);
395 /* Make prototypes for runtime library functions. */
396 void gfc_build_builtin_function_decls (void);
398 /* Set the backend source location of a decl. */
399 void gfc_set_decl_location (tree
, locus
*);
401 /* Return the variable decl for a symbol. */
402 tree
gfc_get_symbol_decl (gfc_symbol
*);
404 /* Build a static initializer. */
405 tree
gfc_conv_initializer (gfc_expr
*, gfc_typespec
*, tree
, bool, bool);
407 /* Substitute a temporary variable in place of the real one. */
408 void gfc_shadow_sym (gfc_symbol
*, tree
, gfc_saved_var
*);
410 /* Restore the original variable. */
411 void gfc_restore_sym (gfc_symbol
*, gfc_saved_var
*);
413 /* Returns true if a variable of specified size should go on the stack. */
414 int gfc_can_put_var_on_stack (tree
);
416 /* Allocate the lang-specific part of a decl node. */
417 void gfc_allocate_lang_decl (tree
);
419 /* Advance along a TREE_CHAIN. */
420 tree
gfc_advance_chain (tree
, int);
422 /* Create a decl for a function. */
423 void gfc_create_function_decl (gfc_namespace
*);
424 /* Generate the code for a function. */
425 void gfc_generate_function_code (gfc_namespace
*);
426 /* Output a BLOCK DATA program unit. */
427 void gfc_generate_block_data (gfc_namespace
*);
428 /* Output a decl for a module variable. */
429 void gfc_generate_module_vars (gfc_namespace
*);
431 /* Get and set the current location. */
432 void gfc_set_backend_locus (locus
*);
433 void gfc_get_backend_locus (locus
*);
435 /* Handle static constructor functions. */
436 extern GTY(()) tree gfc_static_ctors
;
437 void gfc_generate_constructors (void);
439 /* Get the string length of an array constructor. */
440 bool get_array_ctor_strlen (stmtblock_t
*, gfc_constructor
*, tree
*);
442 /* Generate a runtime error check. */
443 void gfc_trans_runtime_check (tree
, const char *, stmtblock_t
*, locus
*);
445 /* Generate a call to free() after checking that its arg is non-NULL. */
446 tree
gfc_call_free (tree
);
448 /* Allocate memory after performing a few checks. */
449 tree
gfc_call_malloc (stmtblock_t
*, tree
, tree
);
451 /* Generate code for an assignment, includes scalarization. */
452 tree
gfc_trans_assignment (gfc_expr
*, gfc_expr
*, bool);
454 /* Generate code for a pointer assignment. */
455 tree
gfc_trans_pointer_assignment (gfc_expr
*, gfc_expr
*);
457 /* Initialize function decls for library functions. */
458 void gfc_build_intrinsic_lib_fndecls (void);
459 /* Create function decls for IO library functions. */
460 void gfc_trans_io_runtime_check (tree
, tree
, int, const char *, stmtblock_t
*);
461 void gfc_build_io_library_fndecls (void);
462 /* Build a function decl for a library function. */
463 tree
gfc_build_library_function_decl (tree
, tree
, int, ...);
466 tree
pushdecl (tree
);
467 tree
pushdecl_top_level (tree
);
468 void pushlevel (int);
469 tree
poplevel (int, int, int);
470 tree
getdecls (void);
471 tree
gfc_truthvalue_conversion (tree
);
472 tree
gfc_builtin_function (tree
);
474 /* In trans-openmp.c */
475 bool gfc_omp_privatize_by_reference (tree
);
476 enum omp_clause_default_kind
gfc_omp_predetermined_sharing (tree
);
477 tree
gfc_omp_clause_default_ctor (tree
, tree
);
478 bool gfc_omp_disregard_value_expr (tree
, bool);
479 bool gfc_omp_private_debug_clause (tree
, bool);
480 struct gimplify_omp_ctx
;
481 void gfc_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx
*, tree
);
483 /* Runtime library function decls. */
484 extern GTY(()) tree gfor_fndecl_internal_realloc
;
485 extern GTY(()) tree gfor_fndecl_allocate
;
486 extern GTY(()) tree gfor_fndecl_allocate_array
;
487 extern GTY(()) tree gfor_fndecl_deallocate
;
488 extern GTY(()) tree gfor_fndecl_pause_numeric
;
489 extern GTY(()) tree gfor_fndecl_pause_string
;
490 extern GTY(()) tree gfor_fndecl_stop_numeric
;
491 extern GTY(()) tree gfor_fndecl_stop_string
;
492 extern GTY(()) tree gfor_fndecl_select_string
;
493 extern GTY(()) tree gfor_fndecl_runtime_error
;
494 extern GTY(()) tree gfor_fndecl_runtime_error_at
;
495 extern GTY(()) tree gfor_fndecl_os_error
;
496 extern GTY(()) tree gfor_fndecl_generate_error
;
497 extern GTY(()) tree gfor_fndecl_set_fpe
;
498 extern GTY(()) tree gfor_fndecl_set_std
;
499 extern GTY(()) tree gfor_fndecl_ttynam
;
500 extern GTY(()) tree gfor_fndecl_ctime
;
501 extern GTY(()) tree gfor_fndecl_fdate
;
502 extern GTY(()) tree gfor_fndecl_in_pack
;
503 extern GTY(()) tree gfor_fndecl_in_unpack
;
504 extern GTY(()) tree gfor_fndecl_associated
;
506 /* Math functions. Many other math functions are handled in
507 trans-intrinsic.c. */
509 typedef struct gfc_powdecl_list
GTY(())
517 extern GTY(()) gfc_powdecl_list gfor_fndecl_math_powi
[4][3];
518 extern GTY(()) tree gfor_fndecl_math_cpowf
;
519 extern GTY(()) tree gfor_fndecl_math_cpow
;
520 extern GTY(()) tree gfor_fndecl_math_cpowl10
;
521 extern GTY(()) tree gfor_fndecl_math_cpowl16
;
522 extern GTY(()) tree gfor_fndecl_math_ishftc4
;
523 extern GTY(()) tree gfor_fndecl_math_ishftc8
;
524 extern GTY(()) tree gfor_fndecl_math_ishftc16
;
525 extern GTY(()) tree gfor_fndecl_math_exponent4
;
526 extern GTY(()) tree gfor_fndecl_math_exponent8
;
527 extern GTY(()) tree gfor_fndecl_math_exponent10
;
528 extern GTY(()) tree gfor_fndecl_math_exponent16
;
530 /* BLAS functions. */
531 extern GTY(()) tree gfor_fndecl_sgemm
;
532 extern GTY(()) tree gfor_fndecl_dgemm
;
533 extern GTY(()) tree gfor_fndecl_cgemm
;
534 extern GTY(()) tree gfor_fndecl_zgemm
;
536 /* String functions. */
537 extern GTY(()) tree gfor_fndecl_compare_string
;
538 extern GTY(()) tree gfor_fndecl_concat_string
;
539 extern GTY(()) tree gfor_fndecl_string_len_trim
;
540 extern GTY(()) tree gfor_fndecl_string_index
;
541 extern GTY(()) tree gfor_fndecl_string_scan
;
542 extern GTY(()) tree gfor_fndecl_string_verify
;
543 extern GTY(()) tree gfor_fndecl_string_trim
;
544 extern GTY(()) tree gfor_fndecl_adjustl
;
545 extern GTY(()) tree gfor_fndecl_adjustr
;
547 /* Other misc. runtime library functions. */
548 extern GTY(()) tree gfor_fndecl_size0
;
549 extern GTY(()) tree gfor_fndecl_size1
;
550 extern GTY(()) tree gfor_fndecl_iargc
;
552 /* Implemented in FORTRAN. */
553 extern GTY(()) tree gfor_fndecl_si_kind
;
554 extern GTY(()) tree gfor_fndecl_sr_kind
;
557 /* True if node is an integer constant. */
558 #define INTEGER_CST_P(node) (TREE_CODE(node) == INTEGER_CST)
560 /* G95-specific declaration information. */
562 /* Array types only. */
563 struct lang_type
GTY(())
566 tree lbound
[GFC_MAX_DIMENSIONS
];
567 tree ubound
[GFC_MAX_DIMENSIONS
];
568 tree stride
[GFC_MAX_DIMENSIONS
];
575 struct lang_decl
GTY(())
577 /* Dummy variables. */
578 tree saved_descriptor
;
579 /* Assigned integer nodes. Stringlength is the IO format string's length.
580 Addr is the address of the string or the target label. Stringlength is
581 initialized to -2 and assigned to -1 when addr is assigned to the
582 address of target label. */
588 #define GFC_DECL_ASSIGN_ADDR(node) DECL_LANG_SPECIFIC(node)->addr
589 #define GFC_DECL_STRING_LEN(node) DECL_LANG_SPECIFIC(node)->stringlen
590 #define GFC_DECL_SAVED_DESCRIPTOR(node) \
591 (DECL_LANG_SPECIFIC(node)->saved_descriptor)
592 #define GFC_DECL_PACKED_ARRAY(node) DECL_LANG_FLAG_0(node)
593 #define GFC_DECL_PARTIAL_PACKED_ARRAY(node) DECL_LANG_FLAG_1(node)
594 #define GFC_DECL_ASSIGN(node) DECL_LANG_FLAG_2(node)
595 #define GFC_DECL_COMMON_OR_EQUIV(node) DECL_LANG_FLAG_3(node)
596 #define GFC_DECL_CRAY_POINTEE(node) DECL_LANG_FLAG_4(node)
597 #define GFC_DECL_RESULT(node) DECL_LANG_FLAG_5(node)
599 /* An array descriptor. */
600 #define GFC_DESCRIPTOR_TYPE_P(node) TYPE_LANG_FLAG_1(node)
601 /* An array without a descriptor. */
602 #define GFC_ARRAY_TYPE_P(node) TYPE_LANG_FLAG_2(node)
603 /* Fortran POINTER type. */
604 #define GFC_POINTER_TYPE_P(node) TYPE_LANG_FLAG_3(node)
605 /* The GFC_TYPE_ARRAY_* members are present in both descriptor and
606 descriptorless array types. */
607 #define GFC_TYPE_ARRAY_LBOUND(node, dim) \
608 (TYPE_LANG_SPECIFIC(node)->lbound[dim])
609 #define GFC_TYPE_ARRAY_UBOUND(node, dim) \
610 (TYPE_LANG_SPECIFIC(node)->ubound[dim])
611 #define GFC_TYPE_ARRAY_STRIDE(node, dim) \
612 (TYPE_LANG_SPECIFIC(node)->stride[dim])
613 #define GFC_TYPE_ARRAY_RANK(node) (TYPE_LANG_SPECIFIC(node)->rank)
614 #define GFC_TYPE_ARRAY_SIZE(node) (TYPE_LANG_SPECIFIC(node)->size)
615 #define GFC_TYPE_ARRAY_OFFSET(node) (TYPE_LANG_SPECIFIC(node)->offset)
616 /* Code should use gfc_get_dtype instead of accesig this directly. It may
617 not be known when the type is created. */
618 #define GFC_TYPE_ARRAY_DTYPE(node) (TYPE_LANG_SPECIFIC(node)->dtype)
619 #define GFC_TYPE_ARRAY_DATAPTR_TYPE(node) \
620 (TYPE_LANG_SPECIFIC(node)->dataptr_type)
622 /* I changed this from sorry(...) because it should not return. */
623 /* TODO: Remove gfc_todo_error before releasing version 1.0. */
624 #define gfc_todo_error(args...) fatal_error("gfc_todo: Not Implemented: " args)
626 /* Build an expression with void type. */
627 #define build1_v(code, arg) build1(code, void_type_node, arg)
628 #define build2_v(code, arg1, arg2) build2(code, void_type_node, \
630 #define build3_v(code, arg1, arg2, arg3) build3(code, void_type_node, \
632 #define build4_v(code, arg1, arg2, arg3, arg4) build4(code, void_type_node, \
633 arg1, arg2, arg3, arg4)
635 /* This group of functions allows a caller to evaluate an expression from
636 the callee's interface. It establishes a mapping between the interface's
637 dummy arguments and the caller's actual arguments, then applies that
638 mapping to a given gfc_expr.
640 You can initialize a mapping structure like so:
642 gfc_interface_mapping mapping;
644 gfc_init_interface_mapping (&mapping);
646 You should then evaluate each actual argument into a temporary
647 gfc_se structure, here called "se", and map the result to the
648 dummy argument's symbol, here called "sym":
650 gfc_add_interface_mapping (&mapping, sym, &se);
652 After adding all mappings, you should call:
654 gfc_finish_interface_mapping (&mapping, pre, post);
656 where "pre" and "post" are statement blocks for initialization
657 and finalization code respectively. You can then evaluate an
658 interface expression "expr" as follows:
660 gfc_apply_interface_mapping (&mapping, se, expr);
662 Once you've evaluated all expressions, you should free
663 the mapping structure with:
665 gfc_free_interface_mapping (&mapping); */
668 /* This structure represents a mapping from OLD to NEW, where OLD is a
669 dummy argument symbol and NEW is a symbol that represents the value
670 of an actual argument. Mappings are linked together using NEXT
671 (in no particular order). */
672 typedef struct gfc_interface_sym_mapping
674 struct gfc_interface_sym_mapping
*next
;
678 gfc_interface_sym_mapping
;
681 /* This structure is used by callers to evaluate an expression from
682 a callee's interface. */
683 typedef struct gfc_interface_mapping
685 /* Maps the interface's dummy arguments to the values that the caller
686 is passing. The whole list is owned by this gfc_interface_mapping. */
687 gfc_interface_sym_mapping
*syms
;
689 /* A list of gfc_charlens that were needed when creating copies of
690 expressions. The whole list is owned by this gfc_interface_mapping. */
691 gfc_charlen
*charlens
;
693 gfc_interface_mapping
;
695 void gfc_init_interface_mapping (gfc_interface_mapping
*);
696 void gfc_free_interface_mapping (gfc_interface_mapping
*);
697 void gfc_add_interface_mapping (gfc_interface_mapping
*,
698 gfc_symbol
*, gfc_se
*);
699 void gfc_finish_interface_mapping (gfc_interface_mapping
*,
700 stmtblock_t
*, stmtblock_t
*);
701 void gfc_apply_interface_mapping (gfc_interface_mapping
*,
702 gfc_se
*, gfc_expr
*);
705 /* Standard error messages used in all the trans-*.c files. */
706 extern char gfc_msg_bounds
[];
707 extern char gfc_msg_fault
[];
708 extern char gfc_msg_wrong_return
[];
711 #endif /* GFC_TRANS_H */