X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ast.c;h=3f597b37f2ff353ed4d0fcb2506b288946e940e1;hb=4511357b499e16aed56536a6d3c6be33f7eab223;hp=4bf325829c0182c6c19b9d4b7474155ac79f0bc0;hpb=f3e5e1221c7cb4595e80121913d1e9ec6212de09;p=cparser diff --git a/ast.c b/ast.c index 4bf3258..3f597b3 100644 --- a/ast.c +++ b/ast.c @@ -1,7 +1,29 @@ +/* + * This file is part of cparser. + * Copyright (C) 2007-2008 Matthias Braun + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA + * 02111-1307, USA. + */ #include #include "ast_t.h" +#include "symbol_t.h" #include "type_t.h" +#include "parser.h" +#include "lang_features.h" #include #include @@ -79,10 +101,12 @@ static unsigned get_expression_precedence(expression_kind_t kind) [EXPR_UNKNOWN] = PREC_PRIM, [EXPR_INVALID] = PREC_PRIM, [EXPR_REFERENCE] = PREC_PRIM, - [EXPR_CHAR_CONST] = PREC_PRIM, + [EXPR_CHARACTER_CONSTANT] = PREC_PRIM, + [EXPR_WIDE_CHARACTER_CONSTANT] = PREC_PRIM, [EXPR_CONST] = PREC_PRIM, [EXPR_STRING_LITERAL] = PREC_PRIM, [EXPR_WIDE_STRING_LITERAL] = PREC_PRIM, + [EXPR_COMPOUND_LITERAL] = PREC_UNARY, [EXPR_CALL] = PREC_PRIM, [EXPR_CONDITIONAL] = PREC_COND, [EXPR_SELECT] = PREC_ACCESS, @@ -91,8 +115,7 @@ static unsigned get_expression_precedence(expression_kind_t kind) [EXPR_CLASSIFY_TYPE] = PREC_UNARY, [EXPR_ALIGNOF] = PREC_UNARY, - [EXPR_FUNCTION] = PREC_PRIM, - [EXPR_PRETTY_FUNCTION] = PREC_PRIM, + [EXPR_FUNCNAME] = PREC_PRIM, [EXPR_BUILTIN_SYMBOL] = PREC_PRIM, [EXPR_BUILTIN_CONSTANT_P] = PREC_PRIM, [EXPR_BUILTIN_PREFETCH] = PREC_PRIM, @@ -114,7 +137,6 @@ static unsigned get_expression_precedence(expression_kind_t kind) [EXPR_UNARY_CAST] = PREC_UNARY, [EXPR_UNARY_CAST_IMPLICIT] = PREC_UNARY, [EXPR_UNARY_ASSUME] = PREC_PRIM, - [EXPR_UNARY_BITFIELD_EXTRACT] = PREC_ACCESS, [EXPR_BINARY_ADD] = PREC_PLUS, [EXPR_BINARY_SUB] = PREC_PLUS, @@ -155,15 +177,10 @@ static unsigned get_expression_precedence(expression_kind_t kind) [EXPR_BINARY_ISLESSGREATER] = PREC_PRIM, [EXPR_BINARY_ISUNORDERED] = PREC_PRIM }; -#ifndef NDEBUG - if ((unsigned)kind >= (sizeof(prec)/sizeof(prec[0]))) { - panic("wrong expression kind"); - } + assert((unsigned)kind < (sizeof(prec)/sizeof(prec[0]))); unsigned res = prec[kind]; - if (res == PREC_BOTTOM) { - panic("expression kind not defined in get_expression_precedence()"); - } -#endif + + assert(res != PREC_BOTTOM); return res; } @@ -197,7 +214,7 @@ static void print_const(const const_expression_t *cnst) static void print_quoted_string(const string_t *const string, char border) { fputc(border, out); - const char *end = string->begin + string->size; + const char *end = string->begin + string->size - 1; for (const char *c = string->begin; c != end; ++c) { if (*c == border) { fputc('\\', out); @@ -224,38 +241,17 @@ static void print_quoted_string(const string_t *const string, char border) fputc(border, out); } -/** - * Print a constant character expression. - * - * @param cnst the constant character expression - */ -static void print_char_const(const const_expression_t *cnst) -{ - print_quoted_string(&cnst->v.chars, '\''); -} - -/** - * Prints a string literal expression. - * - * @param string_literal the string literal expression - */ -static void print_string_literal( - const string_literal_expression_t *string_literal) -{ - print_quoted_string(&string_literal->value, '"'); -} - /** * Prints a wide string literal expression. * * @param wstr the wide string literal expression */ -static void print_wide_string_literal( - const wide_string_literal_expression_t *const wstr) +static void print_quoted_wide_string(const wide_string_t *const wstr, + char border) { - fputs("L\"", out); - for (const wchar_rep_t *c = wstr->value.begin, - *end = c + wstr->value.size; + fputc('L', out); + fputc(border, out); + for (const wchar_rep_t *c = wstr->begin, *end = wstr->begin + wstr->size-1; c != end; ++c) { switch (*c) { case L'\"': fputs("\\\"", out); break; @@ -292,9 +288,68 @@ static void print_wide_string_literal( } } } + fputc(border, out); +} + +/** + * Print a constant character expression. + * + * @param cnst the constant character expression + */ +static void print_character_constant(const const_expression_t *cnst) +{ + print_quoted_string(&cnst->v.character, '\''); +} + +static void print_wide_character_constant(const const_expression_t *cnst) +{ + print_quoted_wide_string(&cnst->v.wide_character, '\''); +} + +/** + * Prints a string literal expression. + * + * @param string_literal the string literal expression + */ +static void print_string_literal( + const string_literal_expression_t *string_literal) +{ + print_quoted_string(&string_literal->value, '"'); +} + +/** + * Prints a predefined symbol. + */ +static void print_funcname( + const funcname_expression_t *funcname) +{ + const char *s = ""; + switch(funcname->kind) { + case FUNCNAME_FUNCTION: s = (c_mode & _C99) ? "__func__" : "__FUNCTION__"; break; + case FUNCNAME_PRETTY_FUNCTION: s = "__PRETTY_FUNCTION__"; break; + case FUNCNAME_FUNCSIG: s = "__FUNCSIG__"; break; + case FUNCNAME_FUNCDNAME: s = "__FUNCDNAME__"; break; + } + fputc('"', out); + fputs(s, out); fputc('"', out); } +static void print_wide_string_literal( + const wide_string_literal_expression_t *const wstr) +{ + print_quoted_wide_string(&wstr->value, '"'); +} + +static void print_compound_literal( + const compound_literal_expression_t *expression) +{ + fputc('(', out); + print_type(expression->type); + fputs(") ", out); + print_initializer(expression->initializer); +} + /** * Prints a call expression. * @@ -399,10 +454,6 @@ static void print_unary_expression(const unary_expression_t *unexpr) case EXPR_UNARY_DEREFERENCE: fputs("*", out); break; case EXPR_UNARY_TAKE_ADDRESS: fputs("&", out); break; - case EXPR_UNARY_BITFIELD_EXTRACT: - print_expression_prec(unexpr->value, prec); - return; - case EXPR_UNARY_POSTFIX_INCREMENT: print_expression_prec(unexpr->value, prec); fputs("++", out); @@ -412,11 +463,6 @@ static void print_unary_expression(const unary_expression_t *unexpr) fputs("--", out); return; case EXPR_UNARY_CAST_IMPLICIT: - if(!print_implicit_casts) { - print_expression_prec(unexpr->value, prec); - return; - } - /* fallthrough */ case EXPR_UNARY_CAST: fputc('(', out); print_type(unexpr->base.type); @@ -454,12 +500,12 @@ static void print_array_expression(const array_access_expression_t *expression) if(!expression->flipped) { print_expression_prec(expression->array_ref, prec); fputc('[', out); - print_expression_prec(expression->index, prec); + print_expression_prec(expression->index, PREC_BOTTOM); fputc(']', out); } else { print_expression_prec(expression->index, prec); fputc('[', out); - print_expression_prec(expression->array_ref, prec); + print_expression_prec(expression->array_ref, PREC_BOTTOM); fputc(']', out); } } @@ -585,8 +631,7 @@ static void print_select(const select_expression_t *expression) { unsigned prec = get_expression_precedence(expression->base.kind); print_expression_prec(expression->compound, prec); - if(expression->compound->base.type == NULL || - expression->compound->base.type->kind == TYPE_POINTER) { + if(is_type_pointer(skip_typeref(expression->compound->base.type))) { fputs("->", out); } else { fputc('.', out); @@ -614,11 +659,10 @@ static void print_classify_type_expression( */ static void print_designator(const designator_t *designator) { - fputs(designator->symbol->string, out); - for (designator = designator->next; designator != NULL; designator = designator->next) { - if (designator->array_access) { + for ( ; designator != NULL; designator = designator->next) { + if (designator->symbol == NULL) { fputc('[', out); - print_expression_prec(designator->array_access, PREC_ACCESS); + print_expression_prec(designator->array_index, PREC_BOTTOM); fputc(']', out); } else { fputc('.', out); @@ -662,6 +706,9 @@ static void print_statement_expression(const statement_expression_t *expression) */ static void print_expression_prec(const expression_t *expression, unsigned top_prec) { + if (expression->kind == EXPR_UNARY_CAST_IMPLICIT && !print_implicit_casts) { + expression = expression->unary.value; + } unsigned prec = get_expression_precedence(expression->base.kind); if (print_parenthesis && top_prec != PREC_BOTTOM) top_prec = PREC_TOP; @@ -670,22 +717,29 @@ static void print_expression_prec(const expression_t *expression, unsigned top_p switch(expression->kind) { case EXPR_UNKNOWN: case EXPR_INVALID: - fprintf(out, "*invalid expression*"); + fprintf(out, "$invalid expression$"); + break; + case EXPR_CHARACTER_CONSTANT: + print_character_constant(&expression->conste); break; - case EXPR_CHAR_CONST: - print_char_const(&expression->conste); + case EXPR_WIDE_CHARACTER_CONSTANT: + print_wide_character_constant(&expression->conste); break; case EXPR_CONST: print_const(&expression->conste); break; - case EXPR_FUNCTION: - case EXPR_PRETTY_FUNCTION: + case EXPR_FUNCNAME: + print_funcname(&expression->funcname); + break; case EXPR_STRING_LITERAL: print_string_literal(&expression->string); break; case EXPR_WIDE_STRING_LITERAL: print_wide_string_literal(&expression->wide_string); break; + case EXPR_COMPOUND_LITERAL: + print_compound_literal(&expression->compound_literal); + break; case EXPR_CALL: print_call_expression(&expression->call); break; @@ -815,9 +869,7 @@ static void print_label_statement(const label_statement_t *statement) { fprintf(stderr, "(%p)", (void*) statement->label); fprintf(out, "%s:\n", statement->label->symbol->string); - if(statement->statement != NULL) { - print_statement(statement->statement); - } + print_statement(statement->statement); } /** @@ -827,12 +879,10 @@ static void print_label_statement(const label_statement_t *statement) */ static void print_if_statement(const if_statement_t *statement) { - fputs("if(", out); + fputs("if (", out); print_expression(statement->condition); fputs(") ", out); - if(statement->true_statement != NULL) { - print_statement(statement->true_statement); - } + print_statement(statement->true_statement); if(statement->false_statement != NULL) { print_indent(); @@ -848,7 +898,7 @@ static void print_if_statement(const if_statement_t *statement) */ static void print_switch_statement(const switch_statement_t *statement) { - fputs("switch(", out); + fputs("switch (", out); print_expression(statement->expression); fputs(") ", out); print_statement(statement->body); @@ -894,6 +944,9 @@ static void print_declaration_statement( declaration_t *declaration = statement->declarations_begin; for( ; declaration != statement->declarations_end->next; declaration = declaration->next) { + if(declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY) + continue; + if(!first) { print_indent(); } else { @@ -911,7 +964,7 @@ static void print_declaration_statement( */ static void print_while_statement(const while_statement_t *statement) { - fputs("while(", out); + fputs("while (", out); print_expression(statement->condition); fputs(") ", out); print_statement(statement->body); @@ -927,7 +980,7 @@ static void print_do_while_statement(const do_while_statement_t *statement) fputs("do ", out); print_statement(statement->body); print_indent(); - fputs("while(", out); + fputs("while (", out); print_expression(statement->condition); fputs(");\n", out); } @@ -939,7 +992,7 @@ static void print_do_while_statement(const do_while_statement_t *statement) */ static void print_for_statement(const for_statement_t *statement) { - fputs("for(", out); + fputs("for (", out); if(statement->scope.declarations != NULL) { assert(statement->initialisation == NULL); print_declaration(statement->scope.declarations); @@ -965,23 +1018,23 @@ static void print_for_statement(const for_statement_t *statement) } /** - * Print assembler constraints. + * Print assembler arguments. * - * @param constraints the constraints + * @param arguments the arguments */ -static void print_asm_constraints(asm_constraint_t *constraints) +static void print_asm_arguments(asm_argument_t *arguments) { - asm_constraint_t *constraint = constraints; - for( ; constraint != NULL; constraint = constraint->next) { - if(constraint != constraints) + asm_argument_t *argument = arguments; + for( ; argument != NULL; argument = argument->next) { + if(argument != arguments) fputs(", ", out); - if(constraint->symbol) { - fprintf(out, "[%s] ", constraint->symbol->string); + if(argument->symbol) { + fprintf(out, "[%s] ", argument->symbol->string); } - print_quoted_string(&constraint->constraints, '"'); + print_quoted_string(&argument->constraints, '"'); fputs(" (", out); - print_expression(constraint->expression); + print_expression(argument->expression); fputs(")", out); } } @@ -1020,12 +1073,12 @@ static void print_asm_statement(const asm_statement_t *statement) goto end_of_print_asm_statement; fputs(" : ", out); - print_asm_constraints(statement->inputs); + print_asm_arguments(statement->inputs); if(statement->outputs == NULL && statement->clobbers == NULL) goto end_of_print_asm_statement; fputs(" : ", out); - print_asm_constraints(statement->outputs); + print_asm_arguments(statement->outputs); if(statement->clobbers == NULL) goto end_of_print_asm_statement; @@ -1036,6 +1089,37 @@ end_of_print_asm_statement: fputs(");\n", out); } +/** + * Print a microsoft __try statement. + * + * @param statement the statement + */ +static void print_ms_try_statement(const ms_try_statement_t *statement) +{ + fputs("__try ", out); + print_statement(statement->try_statement); + print_indent(); + if(statement->except_expression != NULL) { + fputs("__except(", out); + print_expression(statement->except_expression); + fputs(") ", out); + } else { + fputs("__finally ", out); + } + print_statement(statement->final_statement); +} + +/** + * Print a microsoft __leave statement. + * + * @param statement the statement + */ +static void print_leave_statement(const leave_statement_t *statement) +{ + (void) statement; + fputs("__leave;\n", out); +} + /** * Print a statement. * @@ -1044,6 +1128,9 @@ end_of_print_asm_statement: void print_statement(const statement_t *statement) { switch(statement->kind) { + case STATEMENT_EMPTY: + fputs(";\n", out); + break; case STATEMENT_COMPOUND: print_compound_statement(&statement->compound); break; @@ -1089,8 +1176,14 @@ void print_statement(const statement_t *statement) case STATEMENT_ASM: print_asm_statement(&statement->asms); break; + case STATEMENT_MS_TRY: + print_ms_try_statement(&statement->ms_try); + break; + case STATEMENT_LEAVE: + print_leave_statement(&statement->leave); + break; case STATEMENT_INVALID: - fprintf(out, "*invalid statement*"); + fprintf(out, "$invalid statement$"); break; } } @@ -1100,9 +1193,9 @@ void print_statement(const statement_t *statement) * * @param storage_class the storage class */ -static void print_storage_class(unsigned storage_class) +static void print_storage_class(storage_class_tag_t storage_class) { - switch((storage_class_tag_t) storage_class) { + switch(storage_class) { case STORAGE_CLASS_ENUM_ENTRY: case STORAGE_CLASS_NONE: break; @@ -1124,23 +1217,119 @@ static void print_storage_class(unsigned storage_class) */ void print_initializer(const initializer_t *initializer) { - if(initializer->kind == INITIALIZER_VALUE) { + if(initializer == NULL) { + fputs("{}", out); + return; + } + + switch(initializer->kind) { + case INITIALIZER_VALUE: { const initializer_value_t *value = &initializer->value; print_expression(value->value); return; } + case INITIALIZER_LIST: { + assert(initializer->kind == INITIALIZER_LIST); + fputs("{ ", out); + const initializer_list_t *list = &initializer->list; + + for(size_t i = 0 ; i < list->len; ++i) { + const initializer_t *sub_init = list->initializers[i]; + print_initializer(list->initializers[i]); + if(i < list->len-1) { + if(sub_init == NULL || sub_init->kind != INITIALIZER_DESIGNATOR) + fputs(", ", out); + } + } + fputs(" }", out); + return; + } + case INITIALIZER_STRING: + print_quoted_string(&initializer->string.string, '"'); + return; + case INITIALIZER_WIDE_STRING: + print_quoted_wide_string(&initializer->wide_string.string, '"'); + return; + case INITIALIZER_DESIGNATOR: + print_designator(initializer->designator.designator); + fputs(" = ", out); + return; + } - assert(initializer->kind == INITIALIZER_LIST); - fputs("{ ", out); - const initializer_list_t *list = &initializer->list; + panic("invalid initializer kind found"); +} - for(size_t i = 0 ; i < list->len; ++i) { - if(i > 0) { - fputs(", ", out); +/** + * Print microsoft extended declaration modifiers. + */ +static void print_ms_modifiers(const declaration_t *declaration) { + if((c_mode & _MS) == 0) + return; + + decl_modifiers_t modifiers = declaration->modifiers; + + /* DM_FORCEINLINE handled outside. */ + if ((modifiers & ~DM_FORCEINLINE) != 0 || + declaration->alignment != 0 || + declaration->get_property_sym != NULL || + declaration->put_property_sym != NULL) { + char *next = "("; + + fputs("__declspec", out); + if(modifiers & DM_DLLIMPORT) { + fputs(next, out); next = ", "; fputs("dllimport", out); + } + if(modifiers & DM_DLLEXPORT) { + fputs(next, out); next = ", "; fputs("dllexport", out); + } + if(modifiers & DM_THREAD) { + fputs(next, out); next = ", "; fputs("thread", out); + } + if(modifiers & DM_NAKED) { + fputs(next, out); next = ", "; fputs("naked", out); } - print_initializer(list->initializers[i]); + if(modifiers & DM_THREAD) { + fputs(next, out); next = ", "; fputs("thread", out); + } + if(modifiers & DM_SELECTANY) { + fputs(next, out); next = ", "; fputs("selectany", out); + } + if(modifiers & DM_NOTHROW) { + fputs(next, out); next = ", "; fputs("nothrow", out); + } + if(modifiers & DM_NORETURN) { + fputs(next, out); next = ", "; fputs("noreturn", out); + } + if(modifiers & DM_NOINLINE) { + fputs(next, out); next = ", "; fputs("noinline", out); + } + if (modifiers & DM_DEPRECATED) { + fputs(next, out); next = ", "; fputs("deprecated", out); + if(declaration->deprecated_string != NULL) + fprintf(out, "(\"%s\")", declaration->deprecated_string); + } + if(declaration->alignment != 0) { + fputs(next, out); next = ", "; fprintf(out, "align(%u)", declaration->alignment); + } + if(modifiers & DM_RESTRICT) { + fputs(next, out); next = ", "; fputs("restrict", out); + } + if(modifiers & DM_NOALIAS) { + fputs(next, out); next = ", "; fputs("noalias", out); + } + if(declaration->get_property_sym != NULL || declaration->put_property_sym != NULL) { + char *comma = ""; + fputs(next, out); next = ", "; fprintf(out, "property("); + if(declaration->get_property_sym != NULL) { + fprintf(out, "get=%s", declaration->get_property_sym->string); + comma = ", "; + } + if(declaration->put_property_sym != NULL) + fprintf(out, "%sput=%s", comma, declaration->put_property_sym->string); + fputc(')', out); + } + fputs(") ", out); } - fputs("}", out); } /** @@ -1150,13 +1339,17 @@ void print_initializer(const initializer_t *initializer) */ static void print_normal_declaration(const declaration_t *declaration) { - print_storage_class(declaration->storage_class); - if(declaration->is_inline) { - if (declaration->modifiers & DM_FORCEINLINE) + print_storage_class((storage_class_tag_t) declaration->declared_storage_class); + if (declaration->is_inline) { + if (declaration->modifiers & DM_FORCEINLINE) { fputs("__forceinline ", out); - else + } else if (declaration->modifiers & DM_MICROSOFT_INLINE) { + fputs("__inline ", out); + } else { fputs("inline ", out); + } } + print_ms_modifiers(declaration); print_type_ext(declaration->type, declaration->symbol, &declaration->scope); @@ -1244,24 +1437,194 @@ void print_ast(const translation_unit_t *unit) } } -/** - * Returns true if a given expression is a compile time - * constant. - * - * @param expression the expression to check - */ +bool is_constant_initializer(const initializer_t *initializer) +{ + switch(initializer->kind) { + case INITIALIZER_STRING: + case INITIALIZER_WIDE_STRING: + case INITIALIZER_DESIGNATOR: + return true; + + case INITIALIZER_VALUE: + return is_constant_expression(initializer->value.value); + + case INITIALIZER_LIST: + for(size_t i = 0; i < initializer->list.len; ++i) { + initializer_t *sub_initializer = initializer->list.initializers[i]; + if(!is_constant_initializer(sub_initializer)) + return false; + } + return true; + } + panic("invalid initializer kind found"); +} + +static bool is_object_with_linker_constant_address(const expression_t *expression) +{ + switch(expression->kind) { + case EXPR_UNARY_DEREFERENCE: + return is_address_constant(expression->unary.value); + + case EXPR_SELECT: { + type_t *base_type = skip_typeref(expression->select.compound->base.type); + if(is_type_pointer(base_type)) { + /* it's a -> */ + return is_address_constant(expression->select.compound); + } else { + return is_object_with_linker_constant_address(expression->select.compound); + } + } + + case EXPR_ARRAY_ACCESS: + return is_constant_expression(expression->array_access.index) + && is_address_constant(expression->array_access.array_ref); + + case EXPR_REFERENCE: { + declaration_t *declaration = expression->reference.declaration; + switch((storage_class_tag_t) declaration->storage_class) { + case STORAGE_CLASS_NONE: + case STORAGE_CLASS_EXTERN: + case STORAGE_CLASS_STATIC: + return true; + default: + return false; + } + } + + default: + return false; + } +} + +bool is_address_constant(const expression_t *expression) +{ + switch(expression->kind) { + case EXPR_UNARY_TAKE_ADDRESS: + return is_object_with_linker_constant_address(expression->unary.value); + + case EXPR_UNARY_DEREFERENCE: { + type_t *real_type + = revert_automatic_type_conversion(expression->unary.value); + /* dereferencing a function is a NOP */ + if(is_type_function(real_type)) { + return is_address_constant(expression->unary.value); + } + + /* fallthrough */ + } + + case EXPR_UNARY_CAST: { + type_t *dest = skip_typeref(expression->base.type); + if (!is_type_pointer(dest) && + ! (dest->kind == TYPE_ATOMIC + && (get_atomic_type_flags(dest->atomic.akind) & ATOMIC_TYPE_FLAG_INTEGER) + && (get_atomic_type_size(dest->atomic.akind) >= get_atomic_type_size(get_intptr_kind())))) + return false; + + return (is_constant_expression(expression->unary.value) + || is_address_constant(expression->unary.value)); + } + + case EXPR_BINARY_ADD: + case EXPR_BINARY_SUB: { + expression_t *left = expression->binary.left; + expression_t *right = expression->binary.right; + + if(is_type_pointer(skip_typeref(left->base.type))) { + return is_address_constant(left) && is_constant_expression(right); + } else if(is_type_pointer(skip_typeref(right->base.type))) { + return is_constant_expression(left) && is_address_constant(right); + } + + return false; + } + + case EXPR_REFERENCE: { + declaration_t *declaration = expression->reference.declaration; + type_t *type = skip_typeref(declaration->type); + if(is_type_function(type)) + return true; + if(is_type_array(type)) { + return is_object_with_linker_constant_address(expression); + } + return false; + } + + default: + return false; + } +} + +static bool is_builtin_const_call(const expression_t *expression) +{ + expression_t *function = expression->call.function; + if (function->kind != EXPR_BUILTIN_SYMBOL) { + return false; + } + + symbol_t *symbol = function->builtin_symbol.symbol; + + switch (symbol->ID) { + case T___builtin_huge_val: + case T___builtin_nan: + case T___builtin_nanf: + case T___builtin_nand: + return true; + } + + return false; +} + +static bool is_constant_pointer(const expression_t *expression) +{ + if (is_constant_expression(expression)) + return true; + + switch (expression->kind) { + case EXPR_SELECT: + return is_constant_pointer(expression->select.compound); + case EXPR_UNARY_CAST: + return is_constant_pointer(expression->unary.value); + default: + return false; + } +} + +static bool is_object_with_constant_address(const expression_t *expression) +{ + switch(expression->kind) { + case EXPR_SELECT: { + expression_t *compound = expression->select.compound; + type_t *compound_type = compound->base.type; + compound_type = skip_typeref(compound_type); + if(is_type_pointer(compound_type)) { + return is_constant_pointer(compound); + } else { + return is_object_with_constant_address(compound); + } + } + case EXPR_ARRAY_ACCESS: + return is_constant_pointer(expression->array_access.array_ref) + && is_constant_expression(expression->array_access.index); + case EXPR_UNARY_DEREFERENCE: + return is_constant_pointer(expression->unary.value); + default: + return false; + } +} + bool is_constant_expression(const expression_t *expression) { switch(expression->kind) { case EXPR_CONST: - case EXPR_CHAR_CONST: + case EXPR_CHARACTER_CONSTANT: + case EXPR_WIDE_CHARACTER_CONSTANT: case EXPR_STRING_LITERAL: case EXPR_WIDE_STRING_LITERAL: case EXPR_SIZEOF: case EXPR_CLASSIFY_TYPE: - case EXPR_FUNCTION: - case EXPR_PRETTY_FUNCTION: + case EXPR_FUNCNAME: case EXPR_OFFSETOF: case EXPR_ALIGNOF: case EXPR_BUILTIN_CONSTANT_P: @@ -1269,7 +1632,6 @@ bool is_constant_expression(const expression_t *expression) case EXPR_BUILTIN_SYMBOL: case EXPR_BUILTIN_PREFETCH: - case EXPR_CALL: case EXPR_SELECT: case EXPR_VA_START: case EXPR_VA_ARG: @@ -1278,8 +1640,8 @@ bool is_constant_expression(const expression_t *expression) case EXPR_UNARY_POSTFIX_DECREMENT: case EXPR_UNARY_PREFIX_INCREMENT: case EXPR_UNARY_PREFIX_DECREMENT: - case EXPR_UNARY_BITFIELD_EXTRACT: case EXPR_UNARY_ASSUME: /* has VOID type */ + case EXPR_UNARY_DEREFERENCE: case EXPR_BINARY_ASSIGN: case EXPR_BINARY_MUL_ASSIGN: case EXPR_BINARY_DIV_ASSIGN: @@ -1294,15 +1656,22 @@ bool is_constant_expression(const expression_t *expression) case EXPR_BINARY_COMMA: return false; + case EXPR_UNARY_TAKE_ADDRESS: + return is_object_with_constant_address(expression->unary.value); + + case EXPR_CALL: + return is_builtin_const_call(expression); + case EXPR_UNARY_NEGATE: case EXPR_UNARY_PLUS: case EXPR_UNARY_BITWISE_NEGATE: case EXPR_UNARY_NOT: - case EXPR_UNARY_DEREFERENCE: - case EXPR_UNARY_TAKE_ADDRESS: + return is_constant_expression(expression->unary.value); + case EXPR_UNARY_CAST: case EXPR_UNARY_CAST_IMPLICIT: - return is_constant_expression(expression->unary.value); + return is_type_arithmetic(skip_typeref(expression->base.type)) + && is_constant_expression(expression->unary.value); case EXPR_BINARY_ADD: case EXPR_BINARY_SUB: @@ -1332,13 +1701,20 @@ bool is_constant_expression(const expression_t *expression) return is_constant_expression(expression->binary.left) && is_constant_expression(expression->binary.right); - case EXPR_CONDITIONAL: - /* TODO: not correct, we only have to test expressions which are - * evaluated, which means either the true or false part might be not - * constant */ - return is_constant_expression(expression->conditional.condition) - && is_constant_expression(expression->conditional.true_expression) - && is_constant_expression(expression->conditional.false_expression); + case EXPR_COMPOUND_LITERAL: + return is_constant_initializer(expression->compound_literal.initializer); + + case EXPR_CONDITIONAL: { + expression_t *condition = expression->conditional.condition; + if(!is_constant_expression(condition)) + return false; + + long val = fold_constant(condition); + if(val != 0) + return is_constant_expression(expression->conditional.true_expression); + else + return is_constant_expression(expression->conditional.false_expression); + } case EXPR_ARRAY_ACCESS: return is_constant_expression(expression->array_access.array_ref) @@ -1352,8 +1728,10 @@ bool is_constant_expression(const expression_t *expression) return false; } - case EXPR_UNKNOWN: case EXPR_INVALID: + return true; + + case EXPR_UNKNOWN: break; } panic("invalid expression found (is constant expression)");