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 3, 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 COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
25 /* Mangled symbols take the form __module__name. */
26 #define GFC_MAX_MANGLED_SYMBOL_LEN (GFC_MAX_SYMBOL_LEN*2+4)
28 /* Struct for holding a block of statements. It should be treated as an
29 opaque entity and not modified directly. This allows us to change the
30 underlying representation of statement lists. */
34 unsigned int has_scope
:1;
38 /* a simplified expression */
41 /* Code blocks to be executed before and after using the value. */
45 /* the result of the expression */
48 /* The length of a character string value. */
51 /* If set gfc_conv_variable will return an expression for the array
52 descriptor. When set, want_pointer should also be set.
53 If not set scalarizing variables will be substituted. */
54 unsigned descriptor_only
:1;
56 /* When this is set gfc_conv_expr returns the address of a variable. Only
57 applies to EXPR_VARIABLE nodes.
58 Also used by gfc_conv_array_parameter. When set this indicates a pointer
59 to the descriptor should be returned, rather than the descriptor itself.
61 unsigned want_pointer
:1;
63 /* An array function call returning without a temporary. Also used for array
64 pointer assignments. */
65 unsigned direct_byref
:1;
67 /* Ignore absent optional arguments. Used for some intrinsics. */
68 unsigned ignore_optional
:1;
70 /* When this is set the data and offset fields of the returned descriptor
71 are NULL. Used by intrinsic size. */
72 unsigned data_not_needed
:1;
74 /* If set, gfc_conv_function_call does not put byref calls into se->pre. */
75 unsigned no_function_call
:1;
77 /* Scalarization parameters. */
78 struct gfc_se
*parent
;
80 struct gfc_loopinfo
*loop
;
85 /* Scalarization State chain. Created by walking an expression tree before
86 creating the scalarization loops. Then passed as part of a gfc_se structure
87 to translate the expression inside the loop. Note that these chains are
88 terminated by gfc_se_terminator, not NULL. A NULL pointer in a gfc_se
89 indicates to gfc_conv_* that this is a scalar expression.
90 Note that some member arrays correspond to scalarizer rank and others
91 are the variable rank. */
93 typedef struct gfc_ss_info
96 /* The ref that holds information on this section. */
98 /* The descriptor of this array. */
100 /* holds the pointer to the data array. */
102 /* To move some of the array index calculation out of the innermost loop. */
106 /* Holds the SS for a subscript. Indexed by actual dimension. */
107 struct gfc_ss
*subscript
[GFC_MAX_DIMENSIONS
];
109 /* stride and delta are used to access this inside a scalarization loop.
110 start is used in the calculation of these. Indexed by scalarizer
112 tree start
[GFC_MAX_DIMENSIONS
];
113 tree end
[GFC_MAX_DIMENSIONS
];
114 tree stride
[GFC_MAX_DIMENSIONS
];
115 tree delta
[GFC_MAX_DIMENSIONS
];
117 /* Translation from scalarizer dimensions to actual dimensions.
118 actual = dim[scalarizer] */
119 int dim
[GFC_MAX_DIMENSIONS
];
125 /* A scalar value. This will be evaluated before entering the
126 scalarization loop. */
129 /* Like GFC_SS_SCALAR except it evaluates a pointer to the expression.
130 Used for elemental function parameters. */
133 /* An array section. Scalarization indices will be substituted during
134 expression translation. */
137 /* A non-elemental function call returning an array. The call is executed
138 before entering the scalarization loop, storing the result in a
139 temporary. This temporary is then used inside the scalarization loop.
140 Simple assignments, eg. a(:) = fn() are handles without a temporary
141 as a special case. */
144 /* An array constructor. The current implementation is sub-optimal in
145 many cases. It allocated a temporary, assigns the values to it, then
146 uses this temporary inside the scalarization loop. */
149 /* A vector subscript. The vector's descriptor is cached in the
150 "descriptor" field of the associated gfc_ss_info. */
153 /* A temporary array allocated by the scalarizer. Its rank can be less
154 than that of the assignment expression. */
157 /* An intrinsic function call. Many intrinsic functions which map directly
158 to library calls are created as GFC_SS_FUNCTION nodes. */
161 /* A component of a derived type. */
166 /* SS structures can only belong to a single loopinfo. They must be added
167 otherwise they will not get freed. */
168 typedef struct gfc_ss
176 /* If type is GFC_SS_SCALAR or GFC_SS_REFERENCE. */
186 /* The rank of the temporary. May be less than the rank of the
187 assigned expression. */
192 /* All other types. */
197 /* All the SS in a loop and linked through loop_chain. The SS for an
198 expression are linked by the next pointer. */
199 struct gfc_ss
*loop_chain
;
202 /* This is used by assignments requiring temporaries. The bits specify which
203 loops the terms appear in. This will be 1 for the RHS expressions,
204 2 for the LHS expressions, and 3(=1|2) for the temporary. */
208 #define gfc_get_ss() gfc_getmem(sizeof(gfc_ss))
210 /* The contents of this aren't actually used. A NULL SS chain indicates a
211 scalar expression, so this pointer is used to terminate SS chains. */
212 extern gfc_ss
* const gfc_ss_terminator
;
214 /* Holds information about an expression while it is being scalarized. */
215 typedef struct gfc_loopinfo
222 /* All the SS involved with this loop. */
224 /* The SS describing the temporary used in an assignment. */
227 /* The scalarization loop index variables. */
228 tree loopvar
[GFC_MAX_DIMENSIONS
];
230 /* The bounds of the scalarization loops. */
231 tree from
[GFC_MAX_DIMENSIONS
];
232 tree to
[GFC_MAX_DIMENSIONS
];
233 gfc_ss
*specloop
[GFC_MAX_DIMENSIONS
];
235 /* The code member contains the code for the body of the next outer loop. */
236 stmtblock_t code
[GFC_MAX_DIMENSIONS
];
238 /* Order in which the dimensions should be looped, innermost first. */
239 int order
[GFC_MAX_DIMENSIONS
];
241 /* The number of dimensions for which a temporary is used. */
244 /* If set we don't need the loop variables. */
245 unsigned array_parameter
:1;
250 /* Information about a symbol that has been shadowed by a temporary. */
253 symbol_attribute attr
;
259 /* Advance the SS chain to the next term. */
260 void gfc_advance_se_ss_chain (gfc_se
*);
262 /* Call this to initialize a gfc_se structure before use
263 first parameter is structure to initialize, second is
264 parent to get scalarization data from, or NULL. */
265 void gfc_init_se (gfc_se
*, gfc_se
*);
267 /* Create an artificial variable decl and add it to the current scope. */
268 tree
gfc_create_var (tree
, const char *);
269 /* Like above but doesn't add it to the current scope. */
270 tree
gfc_create_var_np (tree
, const char *);
272 /* Store the result of an expression in a temp variable so it can be used
273 repeatedly even if the original changes */
274 void gfc_make_safe_expr (gfc_se
* se
);
276 /* Makes sure se is suitable for passing as a function string parameter. */
277 void gfc_conv_string_parameter (gfc_se
* se
);
279 /* Compare two strings. */
280 tree
gfc_build_compare_string (tree
, tree
, tree
, tree
);
282 /* Add an item to the end of TREE_LIST. */
283 tree
gfc_chainon_list (tree
, tree
);
285 /* When using the gfc_conv_* make sure you understand what they do, i.e.
286 when a POST chain may be created, and what the returned expression may be
287 used for. Note that character strings have special handling. This
288 should not be a problem as most statements/operations only deal with
289 numeric/logical types. See the implementations in trans-expr.c
290 for details of the individual functions. */
292 void gfc_conv_expr (gfc_se
* se
, gfc_expr
* expr
);
293 void gfc_conv_expr_val (gfc_se
* se
, gfc_expr
* expr
);
294 void gfc_conv_expr_lhs (gfc_se
* se
, gfc_expr
* expr
);
295 void gfc_conv_expr_reference (gfc_se
* se
, gfc_expr
*);
296 void gfc_conv_expr_type (gfc_se
* se
, gfc_expr
*, tree
);
299 void gfc_conv_scalar_char_value (gfc_symbol
*sym
, gfc_se
*se
, gfc_expr
**expr
);
301 /* Find the decl containing the auxiliary variables for assigned variables. */
302 void gfc_conv_label_variable (gfc_se
* se
, gfc_expr
* expr
);
303 /* If the value is not constant, Create a temporary and copy the value. */
304 tree
gfc_evaluate_now (tree
, stmtblock_t
*);
306 /* Intrinsic function handling. */
307 void gfc_conv_intrinsic_function (gfc_se
*, gfc_expr
*);
309 /* Does an intrinsic map directly to an external library call. */
310 int gfc_is_intrinsic_libcall (gfc_expr
*);
312 /* Used to call the elemental subroutines used in operator assignments. */
313 tree
gfc_conv_operator_assign (gfc_se
*, gfc_se
*, gfc_symbol
*);
315 /* Also used to CALL subroutines. */
316 int gfc_conv_function_call (gfc_se
*, gfc_symbol
*, gfc_actual_arglist
*,
319 void gfc_conv_subref_array_arg (gfc_se
*, gfc_expr
*, int, sym_intent
);
321 /* gfc_trans_* shouldn't call push/poplevel, use gfc_push/pop_scope */
323 /* Generate code for a scalar assignment. */
324 tree
gfc_trans_scalar_assign (gfc_se
*, gfc_se
*, gfc_typespec
, bool, bool);
326 /* Translate COMMON blocks. */
327 void gfc_trans_common (gfc_namespace
*);
329 /* Translate a derived type constructor. */
330 void gfc_conv_structure (gfc_se
*, gfc_expr
*, int);
332 /* Return an expression which determines if a dummy parameter is present. */
333 tree
gfc_conv_expr_present (gfc_symbol
*);
334 /* Convert a missing, dummy argument into a null or zero. */
335 void gfc_conv_missing_dummy (gfc_se
*, gfc_expr
*, gfc_typespec
, int);
337 /* Generate code to allocate a string temporary. */
338 tree
gfc_conv_string_tmp (gfc_se
*, tree
, tree
);
339 /* Get the string length variable belonging to an expression. */
340 tree
gfc_get_expr_charlen (gfc_expr
*);
341 /* Initialize a string length variable. */
342 void gfc_conv_string_length (gfc_charlen
*, stmtblock_t
*);
343 /* Ensure type sizes can be gimplified. */
344 void gfc_trans_vla_type_sizes (gfc_symbol
*, stmtblock_t
*);
346 /* Add an expression to the end of a block. */
347 void gfc_add_expr_to_block (stmtblock_t
*, tree
);
348 /* Add a block to the end of a block. */
349 void gfc_add_block_to_block (stmtblock_t
*, stmtblock_t
*);
350 /* Add a MODIFY_EXPR or a GIMPLE_MODIFY_STMT to a block. */
351 void gfc_add_modify (stmtblock_t
*, tree
, tree
, bool);
352 #define gfc_add_modify_expr(BLOCK, LHS, RHS) \
353 gfc_add_modify ((BLOCK), (LHS), (RHS), false)
354 #define gfc_add_modify_stmt(BLOCK, LHS, RHS) \
355 gfc_add_modify ((BLOCK), (LHS), (RHS), true)
357 /* Initialize a statement block. */
358 void gfc_init_block (stmtblock_t
*);
359 /* Start a new statement block. Like gfc_init_block but also starts a new
361 void gfc_start_block (stmtblock_t
*);
362 /* Finish a statement block. Also closes the scope if the block was created
363 with gfc_start_block. */
364 tree
gfc_finish_block (stmtblock_t
*);
365 /* Merge the scope of a block with its parent. */
366 void gfc_merge_block_scope (stmtblock_t
* block
);
368 /* Return the backend label decl. */
369 tree
gfc_get_label_decl (gfc_st_label
*);
371 /* Return the decl for an external function. */
372 tree
gfc_get_extern_function_decl (gfc_symbol
*);
374 /* Return the decl for a function. */
375 tree
gfc_get_function_decl (gfc_symbol
*);
377 /* Build an ADDR_EXPR. */
378 tree
gfc_build_addr_expr (tree
, tree
);
380 /* Build an ARRAY_REF. */
381 tree
gfc_build_array_ref (tree
, tree
, tree
);
383 /* Creates a label. Decl is artificial if label_id == NULL_TREE. */
384 tree
gfc_build_label_decl (tree
);
386 /* Return the decl used to hold the function return value.
387 Do not use if the function has an explicit result variable. */
388 tree
gfc_get_fake_result_decl (gfc_symbol
*, int);
390 /* Get the return label for the current function. */
391 tree
gfc_get_return_label (void);
393 /* Add a decl to the binding level for the current function. */
394 void gfc_add_decl_to_function (tree
);
396 /* Make prototypes for runtime library functions. */
397 void gfc_build_builtin_function_decls (void);
399 /* Set the backend source location of a decl. */
400 void gfc_set_decl_location (tree
, locus
*);
402 /* Return the variable decl for a symbol. */
403 tree
gfc_get_symbol_decl (gfc_symbol
*);
405 /* Build a static initializer. */
406 tree
gfc_conv_initializer (gfc_expr
*, gfc_typespec
*, tree
, bool, bool);
408 /* Substitute a temporary variable in place of the real one. */
409 void gfc_shadow_sym (gfc_symbol
*, tree
, gfc_saved_var
*);
411 /* Restore the original variable. */
412 void gfc_restore_sym (gfc_symbol
*, gfc_saved_var
*);
414 /* Returns true if a variable of specified size should go on the stack. */
415 int gfc_can_put_var_on_stack (tree
);
417 /* Allocate the lang-specific part of a decl node. */
418 void gfc_allocate_lang_decl (tree
);
420 /* Advance along a TREE_CHAIN. */
421 tree
gfc_advance_chain (tree
, int);
423 /* Create a decl for a function. */
424 void gfc_create_function_decl (gfc_namespace
*);
425 /* Generate the code for a function. */
426 void gfc_generate_function_code (gfc_namespace
*);
427 /* Output a BLOCK DATA program unit. */
428 void gfc_generate_block_data (gfc_namespace
*);
429 /* Output a decl for a module variable. */
430 void gfc_generate_module_vars (gfc_namespace
*);
432 /* Get and set the current location. */
433 void gfc_set_backend_locus (locus
*);
434 void gfc_get_backend_locus (locus
*);
436 /* Handle static constructor functions. */
437 extern GTY(()) tree gfc_static_ctors
;
438 void gfc_generate_constructors (void);
440 /* Get the string length of an array constructor. */
441 bool get_array_ctor_strlen (stmtblock_t
*, gfc_constructor
*, tree
*);
443 /* Generate a runtime error check. */
444 void gfc_trans_runtime_check (tree
, stmtblock_t
*, locus
*, const char *, ...);
446 /* Generate a call to free() after checking that its arg is non-NULL. */
447 tree
gfc_call_free (tree
);
449 /* Allocate memory after performing a few checks. */
450 tree
gfc_call_malloc (stmtblock_t
*, tree
, tree
);
452 /* Allocate memory for arrays, with optional status variable. */
453 tree
gfc_allocate_array_with_status (stmtblock_t
*, tree
, tree
, tree
);
455 /* Allocate memory, with optional status variable. */
456 tree
gfc_allocate_with_status (stmtblock_t
*, tree
, tree
);
458 /* Generate code to deallocate an array. */
459 tree
gfc_deallocate_with_status (tree
, tree
, bool);
461 /* Generate code to call realloc(). */
462 tree
gfc_call_realloc (stmtblock_t
*, tree
, tree
);
464 /* Generate code for an assignment, includes scalarization. */
465 tree
gfc_trans_assignment (gfc_expr
*, gfc_expr
*, bool);
467 /* Generate code for a pointer assignment. */
468 tree
gfc_trans_pointer_assignment (gfc_expr
*, gfc_expr
*);
470 /* Initialize function decls for library functions. */
471 void gfc_build_intrinsic_lib_fndecls (void);
472 /* Create function decls for IO library functions. */
473 void gfc_trans_io_runtime_check (tree
, tree
, int, const char *, stmtblock_t
*);
474 void gfc_build_io_library_fndecls (void);
475 /* Build a function decl for a library function. */
476 tree
gfc_build_library_function_decl (tree
, tree
, int, ...);
479 tree
pushdecl (tree
);
480 tree
pushdecl_top_level (tree
);
481 void pushlevel (int);
482 tree
poplevel (int, int, int);
483 tree
getdecls (void);
484 tree
gfc_truthvalue_conversion (tree
);
485 tree
gfc_builtin_function (tree
);
486 struct array_descr_info
;
487 bool gfc_get_array_descr_info (const_tree
, struct array_descr_info
*);
489 /* In trans-openmp.c */
490 bool gfc_omp_privatize_by_reference (const_tree
);
491 enum omp_clause_default_kind
gfc_omp_predetermined_sharing (tree
);
492 tree
gfc_omp_clause_default_ctor (tree
, tree
);
493 bool gfc_omp_disregard_value_expr (tree
, bool);
494 bool gfc_omp_private_debug_clause (tree
, bool);
495 struct gimplify_omp_ctx
;
496 void gfc_omp_firstprivatize_type_sizes (struct gimplify_omp_ctx
*, tree
);
498 /* Runtime library function decls. */
499 extern GTY(()) tree gfor_fndecl_pause_numeric
;
500 extern GTY(()) tree gfor_fndecl_pause_string
;
501 extern GTY(()) tree gfor_fndecl_stop_numeric
;
502 extern GTY(()) tree gfor_fndecl_stop_string
;
503 extern GTY(()) tree gfor_fndecl_select_string
;
504 extern GTY(()) tree gfor_fndecl_runtime_error
;
505 extern GTY(()) tree gfor_fndecl_runtime_error_at
;
506 extern GTY(()) tree gfor_fndecl_os_error
;
507 extern GTY(()) tree gfor_fndecl_generate_error
;
508 extern GTY(()) tree gfor_fndecl_set_fpe
;
509 extern GTY(()) tree gfor_fndecl_set_options
;
510 extern GTY(()) tree gfor_fndecl_ttynam
;
511 extern GTY(()) tree gfor_fndecl_ctime
;
512 extern GTY(()) tree gfor_fndecl_fdate
;
513 extern GTY(()) tree gfor_fndecl_in_pack
;
514 extern GTY(()) tree gfor_fndecl_in_unpack
;
515 extern GTY(()) tree gfor_fndecl_associated
;
517 /* Math functions. Many other math functions are handled in
518 trans-intrinsic.c. */
520 typedef struct gfc_powdecl_list
GTY(())
528 extern GTY(()) gfc_powdecl_list gfor_fndecl_math_powi
[4][3];
529 extern GTY(()) tree gfor_fndecl_math_ishftc4
;
530 extern GTY(()) tree gfor_fndecl_math_ishftc8
;
531 extern GTY(()) tree gfor_fndecl_math_ishftc16
;
533 /* BLAS functions. */
534 extern GTY(()) tree gfor_fndecl_sgemm
;
535 extern GTY(()) tree gfor_fndecl_dgemm
;
536 extern GTY(()) tree gfor_fndecl_cgemm
;
537 extern GTY(()) tree gfor_fndecl_zgemm
;
539 /* String functions. */
540 extern GTY(()) tree gfor_fndecl_compare_string
;
541 extern GTY(()) tree gfor_fndecl_concat_string
;
542 extern GTY(()) tree gfor_fndecl_string_len_trim
;
543 extern GTY(()) tree gfor_fndecl_string_index
;
544 extern GTY(()) tree gfor_fndecl_string_scan
;
545 extern GTY(()) tree gfor_fndecl_string_verify
;
546 extern GTY(()) tree gfor_fndecl_string_trim
;
547 extern GTY(()) tree gfor_fndecl_string_minmax
;
548 extern GTY(()) tree gfor_fndecl_adjustl
;
549 extern GTY(()) tree gfor_fndecl_adjustr
;
551 /* Other misc. runtime library functions. */
552 extern GTY(()) tree gfor_fndecl_size0
;
553 extern GTY(()) tree gfor_fndecl_size1
;
554 extern GTY(()) tree gfor_fndecl_iargc
;
556 /* Implemented in FORTRAN. */
557 extern GTY(()) tree gfor_fndecl_si_kind
;
558 extern GTY(()) tree gfor_fndecl_sr_kind
;
561 /* True if node is an integer constant. */
562 #define INTEGER_CST_P(node) (TREE_CODE(node) == INTEGER_CST)
564 /* G95-specific declaration information. */
569 GFC_ARRAY_ASSUMED_SHAPE
,
570 GFC_ARRAY_ALLOCATABLE
,
574 /* Array types only. */
575 struct lang_type
GTY(())
578 enum gfc_array_kind akind
;
579 tree lbound
[GFC_MAX_DIMENSIONS
];
580 tree ubound
[GFC_MAX_DIMENSIONS
];
581 tree stride
[GFC_MAX_DIMENSIONS
];
588 struct lang_decl
GTY(())
590 /* Dummy variables. */
591 tree saved_descriptor
;
592 /* Assigned integer nodes. Stringlength is the IO format string's length.
593 Addr is the address of the string or the target label. Stringlength is
594 initialized to -2 and assigned to -1 when addr is assigned to the
595 address of target label. */
602 #define GFC_DECL_ASSIGN_ADDR(node) DECL_LANG_SPECIFIC(node)->addr
603 #define GFC_DECL_STRING_LEN(node) DECL_LANG_SPECIFIC(node)->stringlen
604 #define GFC_DECL_SPAN(node) DECL_LANG_SPECIFIC(node)->span
605 #define GFC_DECL_SAVED_DESCRIPTOR(node) \
606 (DECL_LANG_SPECIFIC(node)->saved_descriptor)
607 #define GFC_DECL_PACKED_ARRAY(node) DECL_LANG_FLAG_0(node)
608 #define GFC_DECL_PARTIAL_PACKED_ARRAY(node) DECL_LANG_FLAG_1(node)
609 #define GFC_DECL_ASSIGN(node) DECL_LANG_FLAG_2(node)
610 #define GFC_DECL_COMMON_OR_EQUIV(node) DECL_LANG_FLAG_3(node)
611 #define GFC_DECL_CRAY_POINTEE(node) DECL_LANG_FLAG_4(node)
612 #define GFC_DECL_RESULT(node) DECL_LANG_FLAG_5(node)
613 #define GFC_DECL_SUBREF_ARRAY_P(node) DECL_LANG_FLAG_6(node)
615 /* An array descriptor. */
616 #define GFC_DESCRIPTOR_TYPE_P(node) TYPE_LANG_FLAG_1(node)
617 /* An array without a descriptor. */
618 #define GFC_ARRAY_TYPE_P(node) TYPE_LANG_FLAG_2(node)
619 /* Fortran POINTER type. */
620 #define GFC_POINTER_TYPE_P(node) TYPE_LANG_FLAG_3(node)
621 /* The GFC_TYPE_ARRAY_* members are present in both descriptor and
622 descriptorless array types. */
623 #define GFC_TYPE_ARRAY_LBOUND(node, dim) \
624 (TYPE_LANG_SPECIFIC(node)->lbound[dim])
625 #define GFC_TYPE_ARRAY_UBOUND(node, dim) \
626 (TYPE_LANG_SPECIFIC(node)->ubound[dim])
627 #define GFC_TYPE_ARRAY_STRIDE(node, dim) \
628 (TYPE_LANG_SPECIFIC(node)->stride[dim])
629 #define GFC_TYPE_ARRAY_RANK(node) (TYPE_LANG_SPECIFIC(node)->rank)
630 #define GFC_TYPE_ARRAY_SIZE(node) (TYPE_LANG_SPECIFIC(node)->size)
631 #define GFC_TYPE_ARRAY_OFFSET(node) (TYPE_LANG_SPECIFIC(node)->offset)
632 #define GFC_TYPE_ARRAY_AKIND(node) (TYPE_LANG_SPECIFIC(node)->akind)
633 /* Code should use gfc_get_dtype instead of accesing this directly. It may
634 not be known when the type is created. */
635 #define GFC_TYPE_ARRAY_DTYPE(node) (TYPE_LANG_SPECIFIC(node)->dtype)
636 #define GFC_TYPE_ARRAY_DATAPTR_TYPE(node) \
637 (TYPE_LANG_SPECIFIC(node)->dataptr_type)
639 /* Build an expression with void type. */
640 #define build1_v(code, arg) build1(code, void_type_node, arg)
641 #define build2_v(code, arg1, arg2) build2(code, void_type_node, \
643 #define build3_v(code, arg1, arg2, arg3) build3(code, void_type_node, \
645 #define build4_v(code, arg1, arg2, arg3, arg4) build4(code, void_type_node, \
646 arg1, arg2, arg3, arg4)
648 /* This group of functions allows a caller to evaluate an expression from
649 the callee's interface. It establishes a mapping between the interface's
650 dummy arguments and the caller's actual arguments, then applies that
651 mapping to a given gfc_expr.
653 You can initialize a mapping structure like so:
655 gfc_interface_mapping mapping;
657 gfc_init_interface_mapping (&mapping);
659 You should then evaluate each actual argument into a temporary
660 gfc_se structure, here called "se", and map the result to the
661 dummy argument's symbol, here called "sym":
663 gfc_add_interface_mapping (&mapping, sym, &se);
665 After adding all mappings, you should call:
667 gfc_finish_interface_mapping (&mapping, pre, post);
669 where "pre" and "post" are statement blocks for initialization
670 and finalization code respectively. You can then evaluate an
671 interface expression "expr" as follows:
673 gfc_apply_interface_mapping (&mapping, se, expr);
675 Once you've evaluated all expressions, you should free
676 the mapping structure with:
678 gfc_free_interface_mapping (&mapping); */
681 /* This structure represents a mapping from OLD to NEW, where OLD is a
682 dummy argument symbol and NEW is a symbol that represents the value
683 of an actual argument. Mappings are linked together using NEXT
684 (in no particular order). */
685 typedef struct gfc_interface_sym_mapping
687 struct gfc_interface_sym_mapping
*next
;
692 gfc_interface_sym_mapping
;
695 /* This structure is used by callers to evaluate an expression from
696 a callee's interface. */
697 typedef struct gfc_interface_mapping
699 /* Maps the interface's dummy arguments to the values that the caller
700 is passing. The whole list is owned by this gfc_interface_mapping. */
701 gfc_interface_sym_mapping
*syms
;
703 /* A list of gfc_charlens that were needed when creating copies of
704 expressions. The whole list is owned by this gfc_interface_mapping. */
705 gfc_charlen
*charlens
;
707 gfc_interface_mapping
;
709 void gfc_init_interface_mapping (gfc_interface_mapping
*);
710 void gfc_free_interface_mapping (gfc_interface_mapping
*);
711 void gfc_add_interface_mapping (gfc_interface_mapping
*,
712 gfc_symbol
*, gfc_se
*, gfc_expr
*);
713 void gfc_finish_interface_mapping (gfc_interface_mapping
*,
714 stmtblock_t
*, stmtblock_t
*);
715 void gfc_apply_interface_mapping (gfc_interface_mapping
*,
716 gfc_se
*, gfc_expr
*);
719 /* Standard error messages used in all the trans-*.c files. */
720 extern const char gfc_msg_bounds
[];
721 extern const char gfc_msg_fault
[];
722 extern const char gfc_msg_wrong_return
[];
725 #endif /* GFC_TRANS_H */