forked from NUDT-compiler/nudt-compiler-cpp
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40 lines
1016 B
40 lines
1016 B
#include "irgen/IRGen.h"
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#include <stdexcept>
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#include "SysYParser.h"
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#include "ir/IR.h"
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#include "utils/Log.h"
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// 语句生成当前只实现了最小子集。
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// 目前支持：
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// - return <exp>;
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//
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// 还未支持：
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// - 赋值语句
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// - if / while 等控制流
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// - 空语句、块语句嵌套分发之外的更多语句形态
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std::any IRGenImpl::visitStmt(SysYParser::StmtContext* ctx) {
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if (!ctx) {
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throw std::runtime_error(FormatError("irgen", "缺少语句"));
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}
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if (ctx->returnStmt()) {
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return ctx->returnStmt()->accept(this);
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}
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throw std::runtime_error(FormatError("irgen", "暂不支持的语句类型"));
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}
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std::any IRGenImpl::visitReturnStmt(SysYParser::ReturnStmtContext* ctx) {
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if (!ctx) {
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throw std::runtime_error(FormatError("irgen", "缺少 return 语句"));
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}
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if (!ctx->exp()) {
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throw std::runtime_error(FormatError("irgen", "return 缺少表达式"));
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}
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ir::Value* v = EvalExpr(*ctx->exp());
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builder_.CreateRet(v);
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return BlockFlow::Terminated;
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}
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