ZZY
2b4857001c
- 添加 .gitignore 文件，忽略编译器生成的二进制文件 - 重构 lexer.c 文件，改进了关键字处理和字符串处理 - 更新前端的前端、解析器和 AST 相关文件，以适应新的词法分析器 - 优化了 token 相关的定义和函数，引入了新的 token 类型
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
#include "../ast.h"
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#include "../parser.h"
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#include "../symtab/symtab.h"
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/**
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* 0 false
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* 1 true
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*/
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int peek_decl(tok_stream_t* tokbuf) {
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flush_peek_tok(tokbuf);
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switch (peek_tok_type(tokbuf)) {
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case TOKEN_STATIC:
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case TOKEN_EXTERN:
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case TOKEN_REGISTER:
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case TOKEN_TYPEDEF:
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LOG_ERROR("not impliment");
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break;
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default:
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flush_peek_tok(tokbuf);
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}
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switch (peek_tok_type(tokbuf)) {
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case TOKEN_VOID:
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case TOKEN_CHAR:
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case TOKEN_SHORT:
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case TOKEN_INT:
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case TOKEN_LONG:
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case TOKEN_FLOAT:
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case TOKEN_DOUBLE:
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// FIXME Ptr
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return 1;
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default:
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flush_peek_tok(tokbuf);
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}
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return 0;
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}
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ast_node_t* parse_decl_val(parser_t* parser) {
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tok_stream_t* tokbuf = &parser->tokbuf;
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cc_tktype_t ttype;
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flush_peek_tok(tokbuf);
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ast_node_t* node;
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ast_node_t* type_node = parse_type(parser);
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flush_peek_tok(tokbuf);
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ast_node_t* name_node = new_ast_ident_node(peek_tok(tokbuf));
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node = new_ast_node();
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node->decl_val.type = type_node;
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node->decl_val.name = name_node;
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node->type = NT_DECL_VAR;
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symtab_add_symbol(parser->symtab, name_node->syms.tok.val.str, node, 0);
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ttype = peek_tok_type(tokbuf);
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if (ttype == TOKEN_ASSIGN) {
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node->decl_val.expr_stmt = parse_stmt(parser);
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if (node->decl_val.expr_stmt->type != NT_STMT_EXPR) {
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LOG_ERROR("parser_decl_val want stmt_expr");
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}
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} else if (ttype == TOKEN_SEMICOLON) {
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pop_tok(tokbuf);
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expect_pop_tok(tokbuf, TOKEN_SEMICOLON);
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} else {
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LOG_ERROR("parser_decl_val syntax error");
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}
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return node;
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}
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ast_node_t* parse_decl(parser_t* parser) {
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tok_stream_t* tokbuf = &parser->tokbuf;
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flush_peek_tok(tokbuf);
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cc_tktype_t ttype;
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ast_node_t* node;
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if (peek_decl(tokbuf) == 0) {
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LOG_ERROR("syntax error expect decl_val TYPE");
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}
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if (peek_tok_type(tokbuf) != TOKEN_IDENT) {
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LOG_ERROR("syntax error expect decl_val IDENT");
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}
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ttype = peek_tok_type(tokbuf);
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switch (ttype) {
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case TOKEN_L_PAREN: // (
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return NULL;
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break;
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case TOKEN_ASSIGN:
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case TOKEN_SEMICOLON:
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node = parse_decl_val(parser);
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break;
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default:
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LOG_ERROR("syntax error expect decl_val ASSIGN or SEMICOLON");
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return NULL;
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}
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return node;
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}
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