2 * This file is part of cparser.
3 * Copyright (C) 2012 Matthias Braun <matze@braunis.de>
11 #include "lang_features.h"
14 #include "separator_t.h"
22 #if defined(__INTEL_COMPILER)
24 #elif defined(__CYGWIN__)
25 #include "win32/cygwin_math_ext.h"
30 #include "adt/error.h"
33 struct obstack ast_obstack;
36 static int case_indent;
38 bool print_implicit_casts = false;
39 bool print_parenthesis = false;
41 static void print_statement(const statement_t *statement);
42 static void print_expression_prec(const expression_t *expression, unsigned prec);
44 void change_indent(int delta)
50 void print_indent(void)
52 for (int i = 0; i < indent; ++i)
57 * Returns 1 if a given precedence level has right-to-left
58 * associativity, else 0.
60 * @param precedence the operator precedence
62 static int right_to_left(unsigned precedence)
66 case PREC_CONDITIONAL:
76 * Return the precedence of an expression given by its kind.
78 * @param kind the expression kind
80 static unsigned get_expression_precedence(expression_kind_t kind)
82 static const unsigned prec[] = {
83 [EXPR_ERROR] = PREC_PRIMARY,
84 [EXPR_REFERENCE] = PREC_PRIMARY,
85 [EXPR_ENUM_CONSTANT] = PREC_PRIMARY,
86 [EXPR_LITERAL_INTEGER] = PREC_PRIMARY,
87 [EXPR_LITERAL_FLOATINGPOINT] = PREC_PRIMARY,
88 [EXPR_LITERAL_CHARACTER] = PREC_PRIMARY,
89 [EXPR_LITERAL_MS_NOOP] = PREC_PRIMARY,
90 [EXPR_STRING_LITERAL] = PREC_PRIMARY,
91 [EXPR_COMPOUND_LITERAL] = PREC_UNARY,
92 [EXPR_CALL] = PREC_POSTFIX,
93 [EXPR_CONDITIONAL] = PREC_CONDITIONAL,
94 [EXPR_SELECT] = PREC_POSTFIX,
95 [EXPR_ARRAY_ACCESS] = PREC_POSTFIX,
96 [EXPR_SIZEOF] = PREC_UNARY,
97 [EXPR_CLASSIFY_TYPE] = PREC_UNARY,
98 [EXPR_ALIGNOF] = PREC_UNARY,
100 [EXPR_FUNCNAME] = PREC_PRIMARY,
101 [EXPR_BUILTIN_CONSTANT_P] = PREC_PRIMARY,
102 [EXPR_BUILTIN_TYPES_COMPATIBLE_P] = PREC_PRIMARY,
103 [EXPR_OFFSETOF] = PREC_PRIMARY,
104 [EXPR_VA_START] = PREC_PRIMARY,
105 [EXPR_VA_ARG] = PREC_PRIMARY,
106 [EXPR_VA_COPY] = PREC_PRIMARY,
107 [EXPR_STATEMENT] = PREC_PRIMARY,
108 [EXPR_LABEL_ADDRESS] = PREC_PRIMARY,
110 [EXPR_UNARY_NEGATE] = PREC_UNARY,
111 [EXPR_UNARY_PLUS] = PREC_UNARY,
112 [EXPR_UNARY_COMPLEMENT] = PREC_UNARY,
113 [EXPR_UNARY_NOT] = PREC_UNARY,
114 [EXPR_UNARY_DEREFERENCE] = PREC_UNARY,
115 [EXPR_UNARY_TAKE_ADDRESS] = PREC_UNARY,
116 [EXPR_UNARY_POSTFIX_INCREMENT] = PREC_POSTFIX,
117 [EXPR_UNARY_POSTFIX_DECREMENT] = PREC_POSTFIX,
118 [EXPR_UNARY_PREFIX_INCREMENT] = PREC_UNARY,
119 [EXPR_UNARY_PREFIX_DECREMENT] = PREC_UNARY,
120 [EXPR_UNARY_CAST] = PREC_UNARY,
121 [EXPR_UNARY_ASSUME] = PREC_PRIMARY,
122 [EXPR_UNARY_DELETE] = PREC_UNARY,
123 [EXPR_UNARY_DELETE_ARRAY] = PREC_UNARY,
124 [EXPR_UNARY_THROW] = PREC_ASSIGNMENT,
125 [EXPR_UNARY_IMAG] = PREC_UNARY,
126 [EXPR_UNARY_REAL] = PREC_UNARY,
128 [EXPR_BINARY_ADD] = PREC_ADDITIVE,
129 [EXPR_BINARY_SUB] = PREC_ADDITIVE,
130 [EXPR_BINARY_MUL] = PREC_MULTIPLICATIVE,
131 [EXPR_BINARY_DIV] = PREC_MULTIPLICATIVE,
132 [EXPR_BINARY_MOD] = PREC_MULTIPLICATIVE,
133 [EXPR_BINARY_EQUAL] = PREC_EQUALITY,
134 [EXPR_BINARY_NOTEQUAL] = PREC_EQUALITY,
135 [EXPR_BINARY_LESS] = PREC_RELATIONAL,
136 [EXPR_BINARY_LESSEQUAL] = PREC_RELATIONAL,
137 [EXPR_BINARY_GREATER] = PREC_RELATIONAL,
138 [EXPR_BINARY_GREATEREQUAL] = PREC_RELATIONAL,
139 [EXPR_BINARY_BITWISE_AND] = PREC_AND,
140 [EXPR_BINARY_BITWISE_OR] = PREC_OR,
141 [EXPR_BINARY_BITWISE_XOR] = PREC_XOR,
142 [EXPR_BINARY_LOGICAL_AND] = PREC_LOGICAL_AND,
143 [EXPR_BINARY_LOGICAL_OR] = PREC_LOGICAL_OR,
144 [EXPR_BINARY_SHIFTLEFT] = PREC_SHIFT,
145 [EXPR_BINARY_SHIFTRIGHT] = PREC_SHIFT,
146 [EXPR_BINARY_ASSIGN] = PREC_ASSIGNMENT,
147 [EXPR_BINARY_MUL_ASSIGN] = PREC_ASSIGNMENT,
148 [EXPR_BINARY_DIV_ASSIGN] = PREC_ASSIGNMENT,
149 [EXPR_BINARY_MOD_ASSIGN] = PREC_ASSIGNMENT,
150 [EXPR_BINARY_ADD_ASSIGN] = PREC_ASSIGNMENT,
151 [EXPR_BINARY_SUB_ASSIGN] = PREC_ASSIGNMENT,
152 [EXPR_BINARY_SHIFTLEFT_ASSIGN] = PREC_ASSIGNMENT,
153 [EXPR_BINARY_SHIFTRIGHT_ASSIGN] = PREC_ASSIGNMENT,
154 [EXPR_BINARY_BITWISE_AND_ASSIGN] = PREC_ASSIGNMENT,
155 [EXPR_BINARY_BITWISE_XOR_ASSIGN] = PREC_ASSIGNMENT,
156 [EXPR_BINARY_BITWISE_OR_ASSIGN] = PREC_ASSIGNMENT,
157 [EXPR_BINARY_COMMA] = PREC_EXPRESSION,
159 [EXPR_BINARY_ISGREATER] = PREC_PRIMARY,
160 [EXPR_BINARY_ISGREATEREQUAL] = PREC_PRIMARY,
161 [EXPR_BINARY_ISLESS] = PREC_PRIMARY,
162 [EXPR_BINARY_ISLESSEQUAL] = PREC_PRIMARY,
163 [EXPR_BINARY_ISLESSGREATER] = PREC_PRIMARY,
164 [EXPR_BINARY_ISUNORDERED] = PREC_PRIMARY
166 assert((size_t)kind < lengthof(prec));
167 unsigned res = prec[kind];
169 assert(res != PREC_BOTTOM);
174 * Print a quoted string constant.
176 * @param string the string constant
177 * @param border the border char
179 static void print_quoted_string(const string_t *const string, char border)
181 print_string(get_string_encoding_prefix(string->encoding));
184 const char *end = string->begin + string->size;
185 for (const char *c = string->begin; c != end; ++c) {
191 case '\\': print_string("\\\\"); break;
192 case '\a': print_string("\\a"); break;
193 case '\b': print_string("\\b"); break;
194 case '\f': print_string("\\f"); break;
195 case '\n': print_string("\\n"); break;
196 case '\r': print_string("\\r"); break;
197 case '\t': print_string("\\t"); break;
198 case '\v': print_string("\\v"); break;
199 case '\?': print_string("\\?"); break;
201 if (c_mode & _GNUC) {
202 print_string("\\e"); break;
206 if ((unsigned)tc < 0x80 && !isprint(tc)) {
207 print_format("\\%03o", (unsigned)tc);
217 static void print_string_literal(string_literal_expression_t const *const literal, char const delimiter)
219 print_quoted_string(&literal->value, delimiter);
222 static void print_literal(const literal_expression_t *literal)
224 switch (literal->base.kind) {
225 case EXPR_LITERAL_MS_NOOP:
226 print_string("__noop");
229 case EXPR_LITERAL_BOOLEAN:
230 case EXPR_LITERAL_FLOATINGPOINT:
231 case EXPR_LITERAL_INTEGER:
232 print_string(literal->value.begin);
238 print_string("INVALID LITERAL KIND");
242 * Prints a predefined symbol.
244 static void print_funcname(const funcname_expression_t *funcname)
247 switch (funcname->kind) {
248 case FUNCNAME_FUNCTION: s = (c_mode & _C99) ? "__func__" : "__FUNCTION__"; break;
249 case FUNCNAME_PRETTY_FUNCTION: s = "__PRETTY_FUNCTION__"; break;
250 case FUNCNAME_FUNCSIG: s = "__FUNCSIG__"; break;
251 case FUNCNAME_FUNCDNAME: s = "__FUNCDNAME__"; break;
256 static void print_compound_literal(
257 const compound_literal_expression_t *expression)
260 print_type(expression->type);
262 print_initializer(expression->initializer);
265 static void print_assignment_expression(const expression_t *const expr)
267 print_expression_prec(expr, PREC_ASSIGNMENT);
271 * Prints a call expression.
273 * @param call the call expression
275 static void print_call_expression(const call_expression_t *call)
277 print_expression_prec(call->function, PREC_POSTFIX);
279 separator_t sep = { "", ", " };
280 for (call_argument_t const *arg = call->arguments; arg; arg = arg->next) {
281 print_string(sep_next(&sep));
282 print_assignment_expression(arg->expression);
288 * Prints a binary expression.
290 * @param binexpr the binary expression
292 static void print_binary_expression(const binary_expression_t *binexpr)
294 unsigned prec = get_expression_precedence(binexpr->base.kind);
295 int r2l = right_to_left(prec);
297 print_expression_prec(binexpr->left, prec + r2l);
299 switch (binexpr->base.kind) {
300 case EXPR_BINARY_COMMA: op = ", "; break;
301 case EXPR_BINARY_ASSIGN: op = " = "; break;
302 case EXPR_BINARY_ADD: op = " + "; break;
303 case EXPR_BINARY_SUB: op = " - "; break;
304 case EXPR_BINARY_MUL: op = " * "; break;
305 case EXPR_BINARY_MOD: op = " % "; break;
306 case EXPR_BINARY_DIV: op = " / "; break;
307 case EXPR_BINARY_BITWISE_OR: op = " | "; break;
308 case EXPR_BINARY_BITWISE_AND: op = " & "; break;
309 case EXPR_BINARY_BITWISE_XOR: op = " ^ "; break;
310 case EXPR_BINARY_LOGICAL_OR: op = " || "; break;
311 case EXPR_BINARY_LOGICAL_AND: op = " && "; break;
312 case EXPR_BINARY_NOTEQUAL: op = " != "; break;
313 case EXPR_BINARY_EQUAL: op = " == "; break;
314 case EXPR_BINARY_LESS: op = " < "; break;
315 case EXPR_BINARY_LESSEQUAL: op = " <= "; break;
316 case EXPR_BINARY_GREATER: op = " > "; break;
317 case EXPR_BINARY_GREATEREQUAL: op = " >= "; break;
318 case EXPR_BINARY_SHIFTLEFT: op = " << "; break;
319 case EXPR_BINARY_SHIFTRIGHT: op = " >> "; break;
321 case EXPR_BINARY_ADD_ASSIGN: op = " += "; break;
322 case EXPR_BINARY_SUB_ASSIGN: op = " -= "; break;
323 case EXPR_BINARY_MUL_ASSIGN: op = " *= "; break;
324 case EXPR_BINARY_MOD_ASSIGN: op = " %= "; break;
325 case EXPR_BINARY_DIV_ASSIGN: op = " /= "; break;
326 case EXPR_BINARY_BITWISE_OR_ASSIGN: op = " |= "; break;
327 case EXPR_BINARY_BITWISE_AND_ASSIGN: op = " &= "; break;
328 case EXPR_BINARY_BITWISE_XOR_ASSIGN: op = " ^= "; break;
329 case EXPR_BINARY_SHIFTLEFT_ASSIGN: op = " <<= "; break;
330 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: op = " >>= "; break;
331 default: panic("invalid binexpression found");
334 print_expression_prec(binexpr->right, prec + 1 - r2l);
338 * Prints an unary expression.
340 * @param unexpr the unary expression
342 static void print_unary_expression(const unary_expression_t *unexpr)
344 unsigned prec = get_expression_precedence(unexpr->base.kind);
345 switch (unexpr->base.kind) {
346 case EXPR_UNARY_NEGATE: print_char ('-' ); break;
347 case EXPR_UNARY_PLUS: print_char ('+' ); break;
348 case EXPR_UNARY_NOT: print_char ('!' ); break;
349 case EXPR_UNARY_COMPLEMENT: print_char ('~' ); break;
350 case EXPR_UNARY_PREFIX_INCREMENT: print_string("++"); break;
351 case EXPR_UNARY_PREFIX_DECREMENT: print_string("--"); break;
352 case EXPR_UNARY_DEREFERENCE: print_char ('*' ); break;
353 case EXPR_UNARY_TAKE_ADDRESS: print_char ('&' ); break;
354 case EXPR_UNARY_DELETE: print_string("delete "); break;
355 case EXPR_UNARY_DELETE_ARRAY: print_string("delete [] "); break;
356 case EXPR_UNARY_REAL: print_string("__real__ "); break;
357 case EXPR_UNARY_IMAG: print_string("__imag__ "); break;
359 case EXPR_UNARY_POSTFIX_INCREMENT:
360 print_expression_prec(unexpr->value, prec);
363 case EXPR_UNARY_POSTFIX_DECREMENT:
364 print_expression_prec(unexpr->value, prec);
367 case EXPR_UNARY_CAST:
369 print_type(unexpr->base.type);
372 case EXPR_UNARY_ASSUME:
373 print_string("__assume(");
374 print_assignment_expression(unexpr->value);
377 case EXPR_UNARY_THROW:
378 if (unexpr->value == NULL) {
379 print_string("throw");
382 print_string("throw ");
386 panic("invalid unary expression found");
388 print_expression_prec(unexpr->value, prec);
392 * Prints a reference expression.
394 * @param ref the reference expression
396 static void print_reference_expression(const reference_expression_t *ref)
398 print_string(ref->entity->base.symbol->string);
402 * Prints a label address expression.
404 * @param ref the reference expression
406 static void print_label_address_expression(const label_address_expression_t *le)
408 print_format("&&%s", le->label->base.symbol->string);
412 * Prints an array expression.
414 * @param expression the array expression
416 static void print_array_expression(const array_access_expression_t *expression)
418 if (!expression->flipped) {
419 print_expression_prec(expression->array_ref, PREC_POSTFIX);
421 print_expression(expression->index);
424 print_expression_prec(expression->index, PREC_POSTFIX);
426 print_expression(expression->array_ref);
432 * Prints a typeproperty expression (sizeof or __alignof__).
434 * @param expression the type property expression
436 static void print_typeprop_expression(const typeprop_expression_t *expression)
438 switch (expression->base.kind) {
439 case EXPR_SIZEOF: print_string("sizeof"); break;
440 case EXPR_ALIGNOF: print_string(c_mode & _C11 ? "_Alignof" : "__alignof__"); break;
441 default: panic("invalid typeprop kind");
443 if (expression->tp_expression != NULL) {
444 /* PREC_TOP: always print the '()' here, sizeof x is right but unusual */
445 print_expression_prec(expression->tp_expression, PREC_TOP);
448 print_type(expression->type);
454 * Prints a builtin constant expression.
456 * @param expression the builtin constant expression
458 static void print_builtin_constant(const builtin_constant_expression_t *expression)
460 print_string("__builtin_constant_p(");
461 print_assignment_expression(expression->value);
466 * Prints a builtin types compatible expression.
468 * @param expression the builtin types compatible expression
470 static void print_builtin_types_compatible(
471 const builtin_types_compatible_expression_t *expression)
473 print_string("__builtin_types_compatible_p(");
474 print_type(expression->left);
476 print_type(expression->right);
481 * Prints a conditional expression.
483 * @param expression the conditional expression
485 static void print_conditional(const conditional_expression_t *expression)
487 print_expression_prec(expression->condition, PREC_LOGICAL_OR);
488 if (expression->true_expression != NULL) {
490 print_expression_prec(expression->true_expression, PREC_EXPRESSION);
493 print_string(" ?: ");
495 precedence_t prec = c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL;
496 print_expression_prec(expression->false_expression, prec);
500 * Prints a va_start expression.
502 * @param expression the va_start expression
504 static void print_va_start(const va_start_expression_t *const expression)
506 print_string("__builtin_va_start(");
507 print_assignment_expression(expression->ap);
509 print_assignment_expression(expression->parameter);
514 * Prints a va_arg expression.
516 * @param expression the va_arg expression
518 static void print_va_arg(const va_arg_expression_t *expression)
520 print_string("__builtin_va_arg(");
521 print_assignment_expression(expression->ap);
523 print_type(expression->base.type);
528 * Prints a va_copy expression.
530 * @param expression the va_copy expression
532 static void print_va_copy(const va_copy_expression_t *expression)
534 print_string("__builtin_va_copy(");
535 print_assignment_expression(expression->dst);
537 print_assignment_expression(expression->src);
542 * Prints a select expression (. or ->).
544 * @param expression the select expression
546 static void print_select(const select_expression_t *expression)
548 print_expression_prec(expression->compound, PREC_POSTFIX);
549 /* do not print anything for anonymous struct/union selects
550 * FIXME: if the anonymous select was a '->' this will print '.'
552 if (expression->compound_entry->base.symbol == NULL)
555 if (is_type_pointer(skip_typeref(expression->compound->base.type))) {
560 print_string(expression->compound_entry->base.symbol->string);
564 * Prints a type classify expression.
566 * @param expr the type classify expression
568 static void print_classify_type_expression(
569 const classify_type_expression_t *const expr)
571 print_string("__builtin_classify_type(");
572 print_assignment_expression(expr->type_expression);
577 * Prints a designator.
579 * @param designator the designator
581 static void print_designator(const designator_t *designator)
583 for ( ; designator != NULL; designator = designator->next) {
584 if (designator->symbol == NULL) {
586 print_expression(designator->array_index);
587 if (designator->range_last) {
588 print_string(" ... ");
589 print_expression(designator->range_last);
594 print_string(designator->symbol->string);
600 * Prints an offsetof expression.
602 * @param expression the offset expression
604 static void print_offsetof_expression(const offsetof_expression_t *expression)
606 print_string("__builtin_offsetof(");
607 print_type(expression->type);
609 print_designator(expression->designator);
614 * Prints a statement expression.
616 * @param expression the statement expression
618 static void print_statement_expression(const statement_expression_t *expression)
621 print_statement(expression->statement);
625 static bool needs_parentheses(expression_t const *const expr, unsigned const top_prec)
627 if (expr->base.parenthesized)
630 if (top_prec > get_expression_precedence(expr->base.kind))
633 if (print_parenthesis && top_prec != PREC_BOTTOM) {
634 switch (expr->kind) {
635 case EXPR_ENUM_CONSTANT:
637 case EXPR_LITERAL_CASES:
638 case EXPR_LITERAL_CHARACTER:
640 case EXPR_STRING_LITERAL:
641 /* Do not print () around subexpressions consisting of a single token. */
653 * Prints an expression with parenthesis if needed.
655 * @param expression the expression to print
656 * @param top_prec the precedence of the user of this expression.
658 static void print_expression_prec(expression_t const *expr, unsigned const top_prec)
660 if (expr->kind == EXPR_UNARY_CAST && expr->base.implicit && !print_implicit_casts) {
661 expr = expr->unary.value;
664 bool const parenthesized = needs_parentheses(expr, top_prec);
668 switch (expr->kind) {
670 case EXPR_SIZEOF: print_typeprop_expression( &expr->typeprop); break;
671 case EXPR_ARRAY_ACCESS: print_array_expression( &expr->array_access); break;
672 case EXPR_BINARY_CASES: print_binary_expression( &expr->binary); break;
673 case EXPR_BUILTIN_CONSTANT_P: print_builtin_constant( &expr->builtin_constant); break;
674 case EXPR_BUILTIN_TYPES_COMPATIBLE_P: print_builtin_types_compatible(&expr->builtin_types_compatible); break;
675 case EXPR_CALL: print_call_expression( &expr->call); break;
676 case EXPR_CLASSIFY_TYPE: print_classify_type_expression(&expr->classify_type); break;
677 case EXPR_COMPOUND_LITERAL: print_compound_literal( &expr->compound_literal); break;
678 case EXPR_CONDITIONAL: print_conditional( &expr->conditional); break;
679 case EXPR_ERROR: print_string("$error$"); break;
680 case EXPR_FUNCNAME: print_funcname( &expr->funcname); break;
681 case EXPR_LABEL_ADDRESS: print_label_address_expression(&expr->label_address); break;
682 case EXPR_LITERAL_CASES: print_literal( &expr->literal); break;
683 case EXPR_LITERAL_CHARACTER: print_string_literal( &expr->string_literal, '\''); break;
684 case EXPR_OFFSETOF: print_offsetof_expression( &expr->offsetofe); break;
686 case EXPR_ENUM_CONSTANT: print_reference_expression( &expr->reference); break;
687 case EXPR_SELECT: print_select( &expr->select); break;
688 case EXPR_STATEMENT: print_statement_expression( &expr->statement); break;
689 case EXPR_STRING_LITERAL: print_string_literal( &expr->string_literal, '"'); break;
690 case EXPR_UNARY_CASES: print_unary_expression( &expr->unary); break;
691 case EXPR_VA_ARG: print_va_arg( &expr->va_arge); break;
692 case EXPR_VA_COPY: print_va_copy( &expr->va_copye); break;
693 case EXPR_VA_START: print_va_start( &expr->va_starte); break;
699 static void print_indented_statement(statement_t const *const stmt)
701 switch (stmt->kind) {
702 case STATEMENT_LABEL:
705 case STATEMENT_CASE_LABEL:
706 for (int i = 0; i != case_indent; ++i)
714 print_statement(stmt);
718 * Print an compound statement.
720 * @param block the compound statement
722 static void print_compound_statement(const compound_statement_t *block)
727 for (statement_t const *stmt = block->statements; stmt; stmt = stmt->base.next) {
728 print_indented_statement(stmt);
738 * Print a return statement.
740 * @param statement the return statement
742 static void print_return_statement(const return_statement_t *statement)
744 expression_t const *const val = statement->value;
746 print_string("return ");
747 print_expression(val);
750 print_string("return;");
755 * Print an expression statement.
757 * @param statement the expression statement
759 static void print_expression_statement(const expression_statement_t *statement)
761 print_expression(statement->expression);
766 * Print a computed goto statement.
768 * @param statement the computed goto statement
770 static void print_computed_goto_statement(computed_goto_statement_t const *const stmt)
772 print_string("goto *");
773 print_expression(stmt->expression);
778 * Print a goto statement.
780 * @param statement the goto statement
782 static void print_goto_statement(const goto_statement_t *statement)
784 print_string("goto ");
785 print_string(statement->label->base.symbol->string);
790 * Print a label statement.
792 * @param statement the label statement
794 static void print_label_statement(const label_statement_t *statement)
796 print_format("%s:\n", statement->label->base.symbol->string);
797 print_indented_statement(statement->statement);
800 static void print_inner_statement(statement_t const *const stmt)
802 if (stmt->kind == STATEMENT_COMPOUND) {
804 print_compound_statement(&stmt->compound);
808 print_indented_statement(stmt);
813 static void print_after_inner_statement(statement_t const *const stmt)
815 if (stmt->kind == STATEMENT_COMPOUND) {
824 * Print an if statement.
826 * @param statement the if statement
828 static void print_if_statement(const if_statement_t *statement)
830 print_string("if (");
831 print_expression(statement->condition);
833 print_inner_statement(statement->true_statement);
835 statement_t const *const f = statement->false_statement;
837 print_after_inner_statement(statement->true_statement);
838 print_string("else");
839 if (f->kind == STATEMENT_IF) {
841 print_if_statement(&f->ifs);
843 print_inner_statement(f);
849 * Print a switch statement.
851 * @param statement the switch statement
853 static void print_switch_statement(const switch_statement_t *statement)
855 int const old_case_indent = case_indent;
856 case_indent = indent;
858 print_string("switch (");
859 print_expression(statement->expression);
861 print_inner_statement(statement->body);
863 case_indent = old_case_indent;
867 * Print a case label (including the default label).
869 * @param statement the case label statement
871 static void print_case_label(const case_label_statement_t *statement)
873 if (statement->expression == NULL) {
874 print_string("default:\n");
876 print_string("case ");
877 print_expression(statement->expression);
878 if (statement->end_range != NULL) {
879 print_string(" ... ");
880 print_expression(statement->end_range);
884 print_indented_statement(statement->statement);
887 static void print_typedef(const entity_t *entity)
889 print_string("typedef ");
890 print_type_ext(entity->typedefe.type, entity->base.symbol, NULL);
895 * returns true if the entity is a compiler generated one and has no real
896 * correspondenc in the source file
898 static bool is_generated_entity(const entity_t *entity)
900 if (entity->kind == ENTITY_TYPEDEF)
901 return entity->typedefe.builtin;
903 if (is_declaration(entity))
904 return entity->declaration.implicit;
910 * Print a declaration statement.
912 * @param statement the statement
914 static void print_declaration_statement(
915 const declaration_statement_t *statement)
918 entity_t *entity = statement->declarations_begin;
919 if (entity == NULL) {
920 print_string("/* empty declaration statement */");
924 entity_t *const end = statement->declarations_end->base.next;
925 for (; entity != end; entity = entity->base.next) {
926 if (entity->kind == ENTITY_ENUM_VALUE)
928 if (is_generated_entity(entity))
938 print_entity(entity);
943 * Print a do-while statement.
945 * @param statement the statement
947 static void print_do_while_statement(const do_while_statement_t *statement)
950 print_inner_statement(statement->body);
951 print_after_inner_statement(statement->body);
952 print_string("while (");
953 print_expression(statement->condition);
958 * Print a for statement.
960 * @param statement the statement
962 static void print_for_statement(const for_statement_t *statement)
964 if (statement->initialisation || statement->scope.entities || !statement->condition || statement->step) {
965 print_string("for (");
966 if (statement->initialisation != NULL) {
967 print_expression(statement->initialisation);
970 entity_t const *entity = statement->scope.entities;
971 for (; entity != NULL; entity = entity->base.next) {
972 if (is_generated_entity(entity))
974 /* FIXME display of multiple declarations is wrong */
975 print_declaration(entity);
978 if (statement->condition != NULL) {
980 print_expression(statement->condition);
983 if (statement->step != NULL) {
985 print_expression(statement->step);
988 print_string("while (");
989 print_expression(statement->condition);
992 print_inner_statement(statement->body);
996 * Print assembler arguments.
998 * @param arguments the arguments
1000 static void print_asm_arguments(asm_argument_t const *const arguments)
1003 separator_t sep = { " ", ", " };
1004 for (asm_argument_t const *i = arguments; i; i = i->next) {
1005 print_string(sep_next(&sep));
1007 print_format("[%s] ", i->symbol->string);
1008 print_quoted_string(&i->constraints, '"');
1010 print_expression(i->expression);
1016 * Print assembler clobbers.
1018 * @param clobbers the clobbers
1020 static void print_asm_clobbers(asm_clobber_t const *const clobbers)
1023 separator_t sep = { " ", ", " };
1024 for (asm_clobber_t const *i = clobbers; i; i = i->next) {
1025 print_string(sep_next(&sep));
1026 print_quoted_string(&i->clobber, '"');
1030 static void print_asm_labels(asm_label_t const *const labels)
1033 separator_t sep = { " ", ", " };
1034 for (asm_label_t const *i = labels; i; i = i->next) {
1035 print_string(sep_next(&sep));
1036 print_string(i->label->base.symbol->string);
1041 * Print an assembler statement.
1043 * @param stmt the statement
1045 static void print_asm_statement(asm_statement_t const *const stmt)
1047 print_string("asm");
1048 if (stmt->is_volatile) print_string(" volatile");
1049 if (stmt->labels) print_string(" goto");
1051 print_quoted_string(&stmt->asm_text, '"');
1055 stmt->clobbers ? 3 :
1059 if (n >= 1) print_asm_arguments(stmt->outputs);
1060 if (n >= 2) print_asm_arguments(stmt->inputs);
1061 if (n >= 3) print_asm_clobbers( stmt->clobbers);
1062 if (n >= 4) print_asm_labels( stmt->labels);
1068 * Print a microsoft __try statement.
1070 * @param statement the statement
1072 static void print_ms_try_statement(const ms_try_statement_t *statement)
1074 print_string("__try");
1075 print_inner_statement(statement->try_statement);
1076 print_after_inner_statement(statement->try_statement);
1077 if (statement->except_expression != NULL) {
1078 print_string("__except(");
1079 print_expression(statement->except_expression);
1082 print_string("__finally");
1084 print_inner_statement(statement->final_statement);
1088 * Print a microsoft __leave statement.
1090 * @param statement the statement
1092 static void print_leave_statement(const leave_statement_t *statement)
1095 print_string("__leave;");
1099 * Print a statement.
1101 * @param statement the statement
1103 void print_statement(statement_t const *const stmt)
1105 switch (stmt->kind) {
1106 case STATEMENT_ASM: print_asm_statement( &stmt->asms); break;
1107 case STATEMENT_BREAK: print_string("break;"); break;
1108 case STATEMENT_CASE_LABEL: print_case_label( &stmt->case_label); break;
1109 case STATEMENT_COMPOUND: print_compound_statement( &stmt->compound); break;
1110 case STATEMENT_COMPUTED_GOTO: print_computed_goto_statement(&stmt->computed_goto); break;
1111 case STATEMENT_CONTINUE: print_string("continue;"); break;
1112 case STATEMENT_DECLARATION: print_declaration_statement( &stmt->declaration); break;
1113 case STATEMENT_DO_WHILE: print_do_while_statement( &stmt->do_while); break;
1114 case STATEMENT_EMPTY: print_char(';'); break;
1115 case STATEMENT_ERROR: print_string("$error statement$"); break;
1116 case STATEMENT_EXPRESSION: print_expression_statement( &stmt->expression); break;
1117 case STATEMENT_FOR: print_for_statement( &stmt->fors); break;
1118 case STATEMENT_GOTO: print_goto_statement( &stmt->gotos); break;
1119 case STATEMENT_IF: print_if_statement( &stmt->ifs); break;
1120 case STATEMENT_LABEL: print_label_statement( &stmt->label); break;
1121 case STATEMENT_LEAVE: print_leave_statement( &stmt->leave); break;
1122 case STATEMENT_MS_TRY: print_ms_try_statement( &stmt->ms_try); break;
1123 case STATEMENT_RETURN: print_return_statement( &stmt->returns); break;
1124 case STATEMENT_SWITCH: print_switch_statement( &stmt->switchs); break;
1129 * Print a storage class.
1131 * @param storage_class the storage class
1133 static void print_storage_class(storage_class_tag_t storage_class)
1135 switch (storage_class) {
1136 case STORAGE_CLASS_NONE: return;
1137 case STORAGE_CLASS_TYPEDEF: print_string("typedef "); return;
1138 case STORAGE_CLASS_EXTERN: print_string("extern "); return;
1139 case STORAGE_CLASS_STATIC: print_string("static "); return;
1140 case STORAGE_CLASS_AUTO: print_string("auto "); return;
1141 case STORAGE_CLASS_REGISTER: print_string("register "); return;
1143 panic("invalid storage class");
1147 * Print an initializer.
1149 * @param initializer the initializer
1151 void print_initializer(const initializer_t *initializer)
1153 if (initializer == NULL) {
1158 switch (initializer->kind) {
1159 case INITIALIZER_STRING:
1160 case INITIALIZER_VALUE:
1161 print_assignment_expression(initializer->value.value);
1164 case INITIALIZER_LIST: {
1166 const initializer_list_t *list = &initializer->list;
1168 for (size_t i = 0 ; i < list->len; ++i) {
1169 const initializer_t *sub_init = list->initializers[i];
1170 print_initializer(list->initializers[i]);
1171 if (i < list->len-1) {
1172 if (sub_init == NULL || sub_init->kind != INITIALIZER_DESIGNATOR)
1180 case INITIALIZER_DESIGNATOR:
1181 print_designator(initializer->designator.designator);
1182 print_string(" = ");
1186 panic("invalid initializer kind found");
1191 * Print microsoft extended declaration modifiers.
1193 static void print_ms_modifiers(const declaration_t *declaration)
1195 if ((c_mode & _MS) == 0)
1198 decl_modifiers_t modifiers = declaration->modifiers;
1200 separator_t sep = { "__declspec(", ", " };
1202 if (declaration->base.kind == ENTITY_VARIABLE) {
1203 variable_t *variable = (variable_t*)declaration;
1204 if (variable->alignment != 0
1205 || variable->get_property_sym != NULL
1206 || variable->put_property_sym != NULL) {
1207 if (variable->alignment != 0) {
1208 print_format("%salign(%u)", sep_next(&sep), variable->alignment);
1210 if (variable->get_property_sym != NULL
1211 || variable->put_property_sym != NULL) {
1213 print_format("%sproperty(", sep_next(&sep));
1214 if (variable->get_property_sym != NULL) {
1215 print_format("get=%s", variable->get_property_sym->string);
1218 if (variable->put_property_sym != NULL)
1219 print_format("%sput=%s", comma, variable->put_property_sym->string);
1225 /* DM_FORCEINLINE handled outside. */
1226 if ((modifiers & ~DM_FORCEINLINE) != 0) {
1227 if (modifiers & DM_DLLIMPORT) {
1228 print_format("%sdllimport", sep_next(&sep));
1230 if (modifiers & DM_DLLEXPORT) {
1231 print_format("%sdllexport", sep_next(&sep));
1233 if (modifiers & DM_THREAD) {
1234 print_format("%sthread", sep_next(&sep));
1236 if (modifiers & DM_NAKED) {
1237 print_format("%snaked", sep_next(&sep));
1239 if (modifiers & DM_THREAD) {
1240 print_format("%sthread", sep_next(&sep));
1242 if (modifiers & DM_SELECTANY) {
1243 print_format("%sselectany", sep_next(&sep));
1245 if (modifiers & DM_NOTHROW) {
1246 print_format("%snothrow", sep_next(&sep));
1248 if (modifiers & DM_NORETURN) {
1249 print_format("%snoreturn", sep_next(&sep));
1251 if (modifiers & DM_NOINLINE) {
1252 print_format("%snoinline", sep_next(&sep));
1254 if (modifiers & DM_DEPRECATED) {
1255 print_format("%sdeprecated", sep_next(&sep));
1256 if (declaration->deprecated_string != NULL)
1257 print_format("(\"%s\")",
1258 declaration->deprecated_string);
1260 if (modifiers & DM_RESTRICT) {
1261 print_format("%srestrict", sep_next(&sep));
1263 if (modifiers & DM_NOALIAS) {
1264 print_format("%snoalias", sep_next(&sep));
1268 if (!sep_at_first(&sep))
1273 static void print_scope(const scope_t *scope)
1275 const entity_t *entity = scope->entities;
1276 for ( ; entity != NULL; entity = entity->base.next) {
1278 print_entity(entity);
1283 static void print_namespace(const namespace_t *namespace)
1285 print_string("namespace ");
1286 if (namespace->base.symbol != NULL) {
1287 print_string(namespace->base.symbol->string);
1291 print_string("{\n");
1294 print_scope(&namespace->members);
1298 print_string("}\n");
1302 * Print a variable or function declaration
1304 void print_declaration(const entity_t *entity)
1306 assert(is_declaration(entity));
1307 const declaration_t *declaration = &entity->declaration;
1309 print_storage_class((storage_class_tag_t)declaration->declared_storage_class);
1310 if (entity->kind == ENTITY_FUNCTION) {
1311 function_t *function = (function_t*)declaration;
1312 if (function->is_inline) {
1313 if (declaration->modifiers & DM_FORCEINLINE) {
1314 print_string("__forceinline ");
1315 } else if (declaration->modifiers & DM_MICROSOFT_INLINE) {
1316 print_string("__inline ");
1318 print_string("inline ");
1322 //print_ms_modifiers(declaration);
1323 switch (entity->kind) {
1324 case ENTITY_FUNCTION:
1325 print_type_ext(entity->declaration.type, entity->base.symbol,
1326 &entity->function.parameters);
1328 if (entity->function.body != NULL) {
1330 print_indented_statement(entity->function.body);
1336 case ENTITY_VARIABLE:
1337 if (entity->variable.thread_local)
1338 print_string(c_mode & _C11 ? "_Thread_local " : "__thread ");
1339 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1340 if (entity->variable.initializer != NULL) {
1341 print_string(" = ");
1342 print_initializer(entity->variable.initializer);
1346 case ENTITY_COMPOUND_MEMBER:
1347 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1348 if (entity->compound_member.bitfield) {
1349 print_format(" : %u", entity->compound_member.bit_size);
1354 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1361 * Prints an expression.
1363 * @param expression the expression
1365 void print_expression(const expression_t *expression)
1367 print_expression_prec(expression, PREC_BOTTOM);
1371 * Print a declaration.
1373 * @param declaration the declaration
1375 void print_entity(const entity_t *entity)
1377 if (entity->base.namespc != NAMESPACE_NORMAL && entity->base.symbol == NULL)
1380 switch ((entity_kind_tag_t)entity->kind) {
1381 case ENTITY_VARIABLE:
1382 case ENTITY_PARAMETER:
1383 case ENTITY_COMPOUND_MEMBER:
1384 case ENTITY_FUNCTION:
1385 print_declaration(entity);
1387 case ENTITY_TYPEDEF:
1388 print_typedef(entity);
1392 print_string("class ");
1393 print_string(entity->base.symbol->string);
1394 print_string("; /* TODO */\n");
1397 print_string("struct ");
1398 goto print_compound;
1400 print_string("union ");
1402 print_string(entity->base.symbol->string);
1403 if (entity->compound.complete) {
1405 print_compound_definition(&entity->compound);
1410 print_string("enum ");
1411 print_string(entity->base.symbol->string);
1413 print_enum_definition(&entity->enume);
1416 case ENTITY_NAMESPACE:
1417 print_namespace(&entity->namespacee);
1419 case ENTITY_LOCAL_LABEL:
1420 print_string("__label__ ");
1421 print_string(entity->base.symbol->string);
1425 case ENTITY_ENUM_VALUE:
1426 panic("print_entity used on unexpected entity type");
1428 panic("Invalid entity type encountered");
1432 * Print the AST of a translation unit.
1434 * @param unit the translation unit
1436 void print_ast(const translation_unit_t *unit)
1438 entity_t *entity = unit->scope.entities;
1439 for ( ; entity != NULL; entity = entity->base.next) {
1440 if (entity->kind == ENTITY_ENUM_VALUE)
1442 if (entity->base.namespc != NAMESPACE_NORMAL
1443 && entity->base.symbol == NULL)
1445 if (is_generated_entity(entity))
1449 print_entity(entity);
1454 expression_classification_t is_constant_initializer(const initializer_t *initializer)
1456 switch (initializer->kind) {
1457 case INITIALIZER_STRING:
1458 case INITIALIZER_DESIGNATOR:
1459 return EXPR_CLASS_CONSTANT;
1461 case INITIALIZER_VALUE:
1462 return is_linker_constant(initializer->value.value);
1464 case INITIALIZER_LIST: {
1465 expression_classification_t all = EXPR_CLASS_CONSTANT;
1466 for (size_t i = 0; i < initializer->list.len; ++i) {
1467 initializer_t *sub_initializer = initializer->list.initializers[i];
1468 expression_classification_t const cur = is_constant_initializer(sub_initializer);
1476 panic("invalid initializer kind found");
1480 * Checks if an expression references an object with a constant/known location
1481 * to the linker. Example:
1482 * - "x", "*&x" with x being a global variable. The value of x need not be
1483 * constant but the address of x is.
1484 * - "a.b.c" when a has a constant/known location to the linker
1486 static expression_classification_t is_object_with_linker_constant_address(
1487 const expression_t *expression)
1489 switch (expression->kind) {
1490 case EXPR_UNARY_DEREFERENCE:
1491 return is_linker_constant(expression->unary.value);
1493 case EXPR_COMPOUND_LITERAL: {
1494 const compound_literal_expression_t *literal
1495 = &expression->compound_literal;
1496 return literal->global_scope ||
1497 ((literal->type->base.qualifiers & TYPE_QUALIFIER_CONST)
1498 && is_constant_initializer(literal->initializer));
1502 type_t *base_type = skip_typeref(expression->select.compound->base.type);
1503 if (is_type_pointer(base_type)) {
1505 return is_linker_constant(expression->select.compound);
1507 return is_object_with_linker_constant_address(expression->select.compound);
1511 case EXPR_ARRAY_ACCESS: {
1512 expression_classification_t const ref = is_linker_constant(expression->array_access.array_ref);
1513 expression_classification_t const idx = is_constant_expression(expression->array_access.index);
1514 return ref < idx ? ref : idx;
1517 case EXPR_REFERENCE: {
1518 entity_t *entity = expression->reference.entity;
1519 if (!is_declaration(entity))
1520 return EXPR_CLASS_VARIABLE;
1522 switch ((storage_class_tag_t)entity->declaration.storage_class) {
1523 case STORAGE_CLASS_NONE:
1524 case STORAGE_CLASS_EXTERN:
1525 case STORAGE_CLASS_STATIC:
1527 entity->kind != ENTITY_VARIABLE ||
1528 !entity->variable.thread_local ? EXPR_CLASS_CONSTANT :
1529 EXPR_CLASS_VARIABLE;
1531 case STORAGE_CLASS_REGISTER:
1532 case STORAGE_CLASS_TYPEDEF:
1533 case STORAGE_CLASS_AUTO:
1536 return EXPR_CLASS_VARIABLE;
1540 return EXPR_CLASS_ERROR;
1543 return EXPR_CLASS_VARIABLE;
1547 expression_classification_t is_linker_constant(const expression_t *expression)
1549 switch (expression->kind) {
1550 case EXPR_STRING_LITERAL:
1552 case EXPR_LABEL_ADDRESS:
1553 return EXPR_CLASS_CONSTANT;
1555 case EXPR_COMPOUND_LITERAL:
1556 return is_constant_initializer(expression->compound_literal.initializer);
1558 case EXPR_UNARY_TAKE_ADDRESS:
1559 return is_object_with_linker_constant_address(expression->unary.value);
1561 case EXPR_UNARY_DEREFERENCE: {
1563 = revert_automatic_type_conversion(expression->unary.value);
1564 /* dereferencing a function is a NOP */
1565 if (is_type_function(real_type)) {
1566 return is_linker_constant(expression->unary.value);
1571 case EXPR_UNARY_CAST: {
1572 type_t *dest = skip_typeref(expression->base.type);
1573 if (!is_type_pointer(dest) && (
1574 dest->kind != TYPE_ATOMIC ||
1575 !(get_atomic_type_flags(dest->atomic.akind) & ATOMIC_TYPE_FLAG_INTEGER) ||
1576 get_atomic_type_size(dest->atomic.akind) < get_type_size(type_void_ptr)
1578 return is_constant_expression(expression);
1580 return is_linker_constant(expression->unary.value);
1583 case EXPR_BINARY_ADD:
1584 case EXPR_BINARY_SUB: {
1585 expression_t *const left = expression->binary.left;
1586 expression_t *const right = expression->binary.right;
1587 type_t *const ltype = skip_typeref(left->base.type);
1588 type_t *const rtype = skip_typeref(right->base.type);
1590 if (is_type_pointer(ltype)) {
1591 expression_classification_t const l = is_linker_constant(left);
1592 expression_classification_t const r = is_constant_expression(right);
1593 return l < r ? l : r;
1594 } else if (is_type_pointer(rtype)) {
1595 expression_classification_t const l = is_constant_expression(left);
1596 expression_classification_t const r = is_linker_constant(right);
1597 return l < r ? l : r;
1598 } else if (!is_type_valid(ltype) || !is_type_valid(rtype)) {
1599 return EXPR_CLASS_ERROR;
1601 return is_constant_expression(expression);
1605 case EXPR_REFERENCE: {
1606 entity_t *entity = expression->reference.entity;
1607 if (!is_declaration(entity))
1608 return EXPR_CLASS_VARIABLE;
1610 type_t *type = skip_typeref(entity->declaration.type);
1611 if (is_type_function(type))
1612 return EXPR_CLASS_CONSTANT;
1613 if (is_type_array(type)) {
1614 return is_object_with_linker_constant_address(expression);
1616 /* Prevent stray errors */
1617 if (!is_type_valid(type))
1618 return EXPR_CLASS_ERROR;
1619 return EXPR_CLASS_VARIABLE;
1622 case EXPR_ARRAY_ACCESS: {
1623 type_t *const type =
1624 skip_typeref(revert_automatic_type_conversion(expression));
1625 if (!is_type_array(type))
1626 return EXPR_CLASS_VARIABLE;
1627 return is_linker_constant(expression->array_access.array_ref);
1630 case EXPR_CONDITIONAL: {
1631 expression_t *const c = expression->conditional.condition;
1632 expression_classification_t const cclass = is_constant_expression(c);
1633 if (cclass != EXPR_CLASS_CONSTANT)
1636 if (fold_constant_to_bool(c)) {
1637 expression_t const *const t = expression->conditional.true_expression;
1638 return is_linker_constant(t != NULL ? t : c);
1640 return is_linker_constant(expression->conditional.false_expression);
1645 entity_t *entity = expression->select.compound_entry;
1646 if (!is_declaration(entity))
1647 return EXPR_CLASS_VARIABLE;
1648 type_t *type = skip_typeref(entity->declaration.type);
1649 if (is_type_array(type)) {
1650 /* arrays automatically convert to their address */
1651 expression_t *compound = expression->select.compound;
1652 type_t *base_type = skip_typeref(compound->base.type);
1653 if (is_type_pointer(base_type)) {
1655 return is_linker_constant(compound);
1657 return is_object_with_linker_constant_address(compound);
1660 return EXPR_CLASS_VARIABLE;
1664 return is_constant_expression(expression);
1669 * Check if the given expression is a call to a builtin function
1670 * returning a constant result.
1672 static expression_classification_t is_builtin_const_call(const expression_t *expression)
1674 expression_t *function = expression->call.function;
1675 if (function->kind != EXPR_REFERENCE)
1676 return EXPR_CLASS_VARIABLE;
1677 reference_expression_t *ref = &function->reference;
1678 if (ref->entity->kind != ENTITY_FUNCTION)
1679 return EXPR_CLASS_VARIABLE;
1681 switch (ref->entity->function.btk) {
1684 return EXPR_CLASS_CONSTANT;
1686 return EXPR_CLASS_VARIABLE;
1691 static expression_classification_t is_constant_pointer(const expression_t *expression)
1693 expression_classification_t const expr_class = is_constant_expression(expression);
1694 if (expr_class != EXPR_CLASS_VARIABLE)
1697 switch (expression->kind) {
1698 case EXPR_UNARY_CAST:
1699 return is_constant_pointer(expression->unary.value);
1701 return EXPR_CLASS_VARIABLE;
1705 static expression_classification_t is_object_with_constant_address(const expression_t *expression)
1707 switch (expression->kind) {
1709 expression_t *compound = expression->select.compound;
1710 type_t *compound_type = compound->base.type;
1711 compound_type = skip_typeref(compound_type);
1712 if (is_type_pointer(compound_type)) {
1713 return is_constant_pointer(compound);
1715 return is_object_with_constant_address(compound);
1719 case EXPR_ARRAY_ACCESS: {
1720 array_access_expression_t const* const array_access =
1721 &expression->array_access;
1722 expression_classification_t const idx_class = is_constant_expression(array_access->index);
1723 if (idx_class != EXPR_CLASS_CONSTANT)
1725 expression_classification_t const ref_addr = is_object_with_constant_address(array_access->array_ref);
1726 expression_classification_t const ref_ptr = is_constant_pointer(array_access->array_ref);
1727 return ref_addr > ref_ptr ? ref_addr : ref_ptr;
1730 case EXPR_UNARY_DEREFERENCE:
1731 return is_constant_pointer(expression->unary.value);
1734 return EXPR_CLASS_ERROR;
1737 return EXPR_CLASS_VARIABLE;
1741 expression_classification_t is_constant_expression(const expression_t *expression)
1743 switch (expression->kind) {
1744 case EXPR_LITERAL_CHARACTER:
1745 case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
1746 case EXPR_ENUM_CONSTANT:
1747 case EXPR_LITERAL_BOOLEAN:
1748 case EXPR_LITERAL_MS_NOOP:
1749 return EXPR_CLASS_CONSTANT;
1754 type = skip_typeref(expression->typeprop.type);
1757 case EXPR_CLASSIFY_TYPE:
1758 type = skip_typeref(expression->classify_type.type_expression->base.type);
1761 case EXPR_LITERAL_INTEGER:
1762 case EXPR_LITERAL_FLOATINGPOINT:
1763 type = skip_typeref(expression->base.type);
1767 type = skip_typeref(expression->offsetofe.type);
1771 type = skip_typeref(expression->typeprop.type);
1772 if (is_type_array(type) && type->array.is_vla)
1773 return EXPR_CLASS_VARIABLE;
1777 return is_type_valid(type) ? EXPR_CLASS_CONSTANT : EXPR_CLASS_ERROR;
1780 case EXPR_BUILTIN_CONSTANT_P: {
1781 expression_classification_t const c = is_constant_expression(expression->builtin_constant.value);
1782 return c != EXPR_CLASS_ERROR ? EXPR_CLASS_CONSTANT : EXPR_CLASS_ERROR;
1785 case EXPR_STRING_LITERAL:
1787 case EXPR_LABEL_ADDRESS:
1792 case EXPR_STATEMENT:
1793 case EXPR_UNARY_POSTFIX_INCREMENT:
1794 case EXPR_UNARY_POSTFIX_DECREMENT:
1795 case EXPR_UNARY_PREFIX_INCREMENT:
1796 case EXPR_UNARY_PREFIX_DECREMENT:
1797 case EXPR_UNARY_ASSUME: /* has VOID type */
1798 case EXPR_UNARY_DEREFERENCE:
1799 case EXPR_UNARY_DELETE:
1800 case EXPR_UNARY_DELETE_ARRAY:
1801 case EXPR_UNARY_THROW:
1802 case EXPR_BINARY_ASSIGN:
1803 case EXPR_BINARY_MUL_ASSIGN:
1804 case EXPR_BINARY_DIV_ASSIGN:
1805 case EXPR_BINARY_MOD_ASSIGN:
1806 case EXPR_BINARY_ADD_ASSIGN:
1807 case EXPR_BINARY_SUB_ASSIGN:
1808 case EXPR_BINARY_SHIFTLEFT_ASSIGN:
1809 case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
1810 case EXPR_BINARY_BITWISE_AND_ASSIGN:
1811 case EXPR_BINARY_BITWISE_XOR_ASSIGN:
1812 case EXPR_BINARY_BITWISE_OR_ASSIGN:
1813 case EXPR_BINARY_COMMA:
1814 case EXPR_ARRAY_ACCESS:
1815 return EXPR_CLASS_VARIABLE;
1817 case EXPR_REFERENCE: {
1818 type_t *const type = skip_typeref(expression->base.type);
1819 return is_type_valid(type) ? EXPR_CLASS_VARIABLE : EXPR_CLASS_ERROR;
1822 case EXPR_UNARY_TAKE_ADDRESS:
1823 return is_object_with_constant_address(expression->unary.value);
1826 return is_builtin_const_call(expression);
1828 case EXPR_UNARY_NEGATE:
1829 case EXPR_UNARY_PLUS:
1830 case EXPR_UNARY_COMPLEMENT:
1831 case EXPR_UNARY_NOT:
1832 return is_constant_expression(expression->unary.value);
1834 case EXPR_UNARY_IMAG:
1835 case EXPR_UNARY_REAL: {
1836 type_t *type = skip_typeref(expression->base.type);
1837 if (!is_type_valid(type))
1838 return EXPR_CLASS_ERROR;
1839 return is_constant_expression(expression->unary.value);
1842 case EXPR_UNARY_CAST: {
1843 type_t *const type = skip_typeref(expression->base.type);
1844 if (is_type_scalar(type))
1845 return is_constant_expression(expression->unary.value);
1846 if (!is_type_valid(type))
1847 return EXPR_CLASS_ERROR;
1848 return EXPR_CLASS_VARIABLE;
1851 case EXPR_BINARY_ADD:
1852 case EXPR_BINARY_SUB:
1853 case EXPR_BINARY_MUL:
1854 case EXPR_BINARY_DIV:
1855 case EXPR_BINARY_MOD:
1856 case EXPR_BINARY_EQUAL:
1857 case EXPR_BINARY_NOTEQUAL:
1858 case EXPR_BINARY_LESS:
1859 case EXPR_BINARY_LESSEQUAL:
1860 case EXPR_BINARY_GREATER:
1861 case EXPR_BINARY_GREATEREQUAL:
1862 case EXPR_BINARY_BITWISE_AND:
1863 case EXPR_BINARY_BITWISE_OR:
1864 case EXPR_BINARY_BITWISE_XOR:
1865 case EXPR_BINARY_SHIFTLEFT:
1866 case EXPR_BINARY_SHIFTRIGHT:
1867 case EXPR_BINARY_ISGREATER:
1868 case EXPR_BINARY_ISGREATEREQUAL:
1869 case EXPR_BINARY_ISLESS:
1870 case EXPR_BINARY_ISLESSEQUAL:
1871 case EXPR_BINARY_ISLESSGREATER:
1872 case EXPR_BINARY_ISUNORDERED: {
1873 expression_classification_t const l = is_constant_expression(expression->binary.left);
1874 expression_classification_t const r = is_constant_expression(expression->binary.right);
1875 return l < r ? l : r;
1878 case EXPR_BINARY_LOGICAL_AND: {
1879 expression_t const *const left = expression->binary.left;
1880 expression_classification_t const lclass = is_constant_expression(left);
1881 if (lclass != EXPR_CLASS_CONSTANT)
1883 if (!fold_constant_to_bool(left))
1884 return EXPR_CLASS_CONSTANT;
1885 return is_constant_expression(expression->binary.right);
1888 case EXPR_BINARY_LOGICAL_OR: {
1889 expression_t const *const left = expression->binary.left;
1890 expression_classification_t const lclass = is_constant_expression(left);
1891 if (lclass != EXPR_CLASS_CONSTANT)
1893 if (fold_constant_to_bool(left))
1894 return EXPR_CLASS_CONSTANT;
1895 return is_constant_expression(expression->binary.right);
1898 case EXPR_COMPOUND_LITERAL:
1899 return is_constant_initializer(expression->compound_literal.initializer);
1901 case EXPR_CONDITIONAL: {
1902 expression_t *const condition = expression->conditional.condition;
1903 expression_classification_t const cclass = is_constant_expression(condition);
1904 if (cclass != EXPR_CLASS_CONSTANT)
1907 if (fold_constant_to_bool(condition)) {
1908 expression_t const *const t = expression->conditional.true_expression;
1909 return t == NULL ? EXPR_CLASS_CONSTANT : is_constant_expression(t);
1911 return is_constant_expression(expression->conditional.false_expression);
1916 return EXPR_CLASS_ERROR;
1918 panic("invalid expression");
1923 obstack_init(&ast_obstack);
1928 obstack_free(&ast_obstack, NULL);