feat(ast): 添加AST定义和dump工具头文件
新增libs/ast模块的基础定义文件，包括： - AST节点类型枚举定义，涵盖声明、语句、表达式、类型等各类节点 - AST操作符枚举，定义所有二元、一元、逻辑、算术等操作符 - AST节点结构体定义，包含表达式、语句、声明、类型等具体实现 - AST dump工具接口，支持树形结构输出和颜色显示 - 语义分析回调函数类型定义，为后续语义分析提供基础
This commit is contained in:
250
libs/parser/src/parse_decl.c
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250
libs/parser/src/parse_decl.c
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#include <parser.h>
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/*
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A.2.2 Declarations
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(6.7) declaration:
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declaration-specifiers init-declarator-list(opt) ;
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(6.7) declaration-specifiers:
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storage-class-specifier declaration-specifiers(opt)
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type-specifier declaration-specifiers(opt)
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type-qualifier declaration-specifiers(opt)
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function-specifier declaration-specifiers(opt)
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(6.7) init-declarator-list:
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init-declarator
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init-declarator-list , init-declarator
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(6.7) init-declarator:
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declarator
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declarator = initializer
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(6.7.1) storage-class-specifier:
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typedef
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extern
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static
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auto
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register
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(6.7.2) type-specifier:
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void
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char
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short
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int
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long
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float
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double
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signed
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unsigned
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_Bool
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_Complex
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struct-or-union-specifier
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enum-specifier
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typedef-name
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(6.7.2.1) struct-or-union-specifier:
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struct-or-union identifier(opt) { struct-declaration-list }
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struct-or-union identifier
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(6.7.2.1) struct-or-union:
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struct
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union
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(6.7.2.1) struct-declaration-list:
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struct-declaration
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struct-declaration-list struct-declaration
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(6.7.2.1) struct-declaration:
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specifier-qualifier-list struct-declarator-list ;
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(6.7.2.1) specifier-qualifier-list:
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type-specifier specifier-qualifier-list(opt)
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type-qualifier specifier-qualifier-list(opt)
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(6.7.2.1) struct-declarator-list:
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struct-declarator
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struct-declarator-list , struct-declarator
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(6.7.2.1) struct-declarator:
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declarator
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declarator(opt) : constant-expression
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(6.7.2.2) enum-specifier:
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enum identifier(opt) { enumerator-list }
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enum identifier(opt) { enumerator-list ,}
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enum identifier
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(6.7.2.2) enumerator-list:
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enumerator
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enumerator-list , enumerator
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(6.7.2.2) enumerator:
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enumeration-constant
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enumeration-constant = constant-expression
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(6.7.3) type-qualifier:
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const
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restrict
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volatile
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(6.7.4) function-specifier:
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inline
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(6.7.5) declarator:
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pointer(opt) direct-declarator
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(6.7.5) direct-declarator:
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identifier
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( declarator )
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direct-declarator [ type-qualifier-list(opt)
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assignment-expression(opt) ]
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direct-declarator [ static type-qualifier-list(opt)
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assignment-expression ]
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direct-declarator [ type-qualifier-list static
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assignment-expression ]
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direct-declarator [ type-qualifier-list(opt) *]
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direct-declarator ( parameter-type-list )
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direct-declarator ( identifier-list(opt) )
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(6.7.5) pointer:
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* type-qualifier-list(opt)
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* type-qualifier-list(opt) pointer
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(6.7.5) type-qualifier-list:
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type-qualifier
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type-qualifier-list type-qualifier
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(6.7.5) parameter-type-list:
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parameter-list
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parameter-list , ...
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(6.7.5) parameter-list:
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parameter-declaration
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parameter-list , parameter-declaration
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(6.7.5) parameter-declaration:
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declaration-specifiers declarator
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declaration-specifiers abstract-declarator(opt)
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(6.7.5) identifier-list:
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identifier
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identifier-list , identifier
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(6.7.6) type-name:
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specifier-qualifier-list abstract-declarator(opt)
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(6.7.6) abstract-declarator:
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pointer
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pointer(opt) direct-abstract-declarator
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(6.7.6) direct-abstract-declarator:
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( abstract-declarator )
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direct-abstract-declarator(opt) [ type-qualifier-list (opt)
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assignment-expression(opt) ]
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direct-abstract-declarator(opt) [static type-qualifier-list(opt)
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assignment-expression ]
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direct-abstract-declaratoropt [ type-qualifier-list static
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assignment-expression ]
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direct-abstract-declarator(opt) [ * ]
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direct-abstract-declarator(opt) ( parameter-type-list(opt) )
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(6.7.7) typedef-name:
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identifier
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(6.7.8) initializer:
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assignment-expression
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{ initializer-list }
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{ initializer-list , }
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(6.7.8) initializer-list:
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designation(opt) initializer
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initializer-list , designation(opt) initializer
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(6.7.8) designation:
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designator-list =
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(6.7.8) designator-list:
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designator
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designator-list designator
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(6.7.8) designator:
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[ constant-expression ]
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. identifier
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A.2.4 External definitions
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(6.9) translation-unit:
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external-declaration
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translation-unit external-declaration
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(6.9) external-declaration:
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function-definition
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declaration
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(6.9.1) function-definition:
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declaration-specifiers declarator declaration-list(opt)
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compound-statement
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(6.9.1) declaration-list:
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declaration
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declaration-list declaration
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*/
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scc_ast_decl_t *scc_parse_declaration(scc_parser_t *parser) {
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/**
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* ISO/IEC 9899:TC3
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* 6.7 Declarations
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* Syntax
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*
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* declaration:
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* declaration-specifiers init-declarator-list(opt) ;
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* declaration-specifiers:
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* storage-class-specifier declaration-specifiers(opt)
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* type-specifier declaration-specifiers(opt)
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* type-qualifier declaration-specifiers(opt)
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* function-specifier declaration-specifiers(opt)
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* init-declarator-list:
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* init-declarator
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* init-declarator-list , init-declarator
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* init-declarator:
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* declarator
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* declarator = initializer
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*/
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if (!scc_parse_is_declaration_start(parser, 0)) {
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return null;
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}
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scc_ast_type_t *type = scc_parse_type(parser);
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if (type == null) {
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LOG_ERROR("Failed to parse type");
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return null;
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}
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const scc_lexer_tok_t *tok = scc_lexer_stream_current(parser->lex_stream);
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if (!scc_lexer_tok_match(tok, SCC_TOK_IDENT)) {
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LOG_ERROR("Expected identifier, got %s", scc_get_tok_name(tok->type));
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return null;
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}
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scc_lexer_stream_consume(parser->lex_stream);
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scc_ast_decl_t *decl = scc_malloc(sizeof(scc_ast_decl_t));
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/*
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(6.7.5) declarator:
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pointeropt direct-declarator
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(6.7.5) direct-declarator:
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identifier
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( declarator )
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direct-declarator [ type-qualifier-listopt assignment-expressionopt ]
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direct-declarator [static type-qualifier-listopt assignment-expression ]
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direct-declarator [ type-qualifier-list static assignment-expression ]
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direct-declarator [ type-qualifier-listopt *]
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direct-declarator ( parameter-type-list )
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direct-declarator ( identifier-listopt )
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*/
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if (!scc_parse_consume_if(parser->lex_stream, SCC_TOK_L_PAREN)) {
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// TODO
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if (scc_parse_consume_if(parser->lex_stream, SCC_TOK_SEMICOLON)) {
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decl->base.type = SCC_AST_DECL_VAR;
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decl->var.type = type;
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decl->var.name = tok->value.cstr.data;
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decl->var.init = null;
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return decl;
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} else if (scc_parse_consume_if(parser->lex_stream, SCC_TOK_ASSIGN)) {
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decl->base.type = SCC_AST_DECL_VAR;
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decl->var.type = type;
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decl->var.name = tok->value.cstr.data;
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decl->var.init = scc_parse_expression(parser);
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return decl;
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}
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return null;
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}
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// function decl
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decl->base.type = SCC_AST_DECL_FUNC;
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decl->func.name = tok->value.cstr.data;
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decl->func.type = scc_malloc(sizeof(scc_ast_type_t));
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decl->func.type->base.type = SCC_AST_TYPE_FUNCTION;
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scc_vec_init(decl->func.type->function.param_types);
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decl->func.type->function.return_type = type;
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// TODO
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decl->func.type->function.is_variadic = false;
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// TODO param type
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scc_parse_consume_if(parser->lex_stream, SCC_TOK_VOID);
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if (!scc_parse_consume_if(parser->lex_stream, SCC_TOK_R_PAREN)) {
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return null;
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}
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if (!scc_parse_is(parser->lex_stream, SCC_TOK_L_BRACE)) {
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return null;
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}
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decl->func.body = scc_parse_statement(parser);
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Assert(decl->func.type != null);
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Assert(decl->func.type->base.type == SCC_AST_TYPE_FUNCTION);
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Assert(decl->func.body != null);
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Assert(decl->func.body->base.type == SCC_AST_STMT_COMPOUND);
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return decl;
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}
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