forked from NUDT-compiler/nudt-compiler-cpp
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55 lines
1.4 KiB
55 lines
1.4 KiB
#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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void IRGenImpl::GenBlock(SysYParser::BlockContext& block) {
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for (auto* item : block.blockItem()) {
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if (item) {
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if (GenBlockItem(*item)) {
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// 当前语法要求 return 为块内最后一条语句；命中后可停止生成。
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break;
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}
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}
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}
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}
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bool IRGenImpl::GenBlockItem(SysYParser::BlockItemContext& item) {
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if (item.decl()) {
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GenDecl(*item.decl());
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return false;
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}
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if (item.stmt()) {
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return GenStmt(*item.stmt());
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}
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throw std::runtime_error(FormatError("irgen", "暂不支持的语句或声明"));
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}
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void IRGenImpl::GenDecl(SysYParser::DeclContext& decl) {
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if (decl.varDecl()) {
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GenVarDecl(*decl.varDecl());
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return;
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}
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throw std::runtime_error(FormatError("irgen", "暂不支持的声明类型"));
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}
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void IRGenImpl::GenVarDecl(SysYParser::VarDeclContext& decl) {
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const std::string name = decl.Ident()->getText();
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if (locals_.find(name) != locals_.end()) {
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throw std::runtime_error(FormatError("irgen", "重复定义变量: " + name));
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}
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auto* slot = builder_.CreateAllocaI32(ir::DefaultContext().NextTemp());
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locals_[name] = slot;
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ir::Value* init = nullptr;
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if (decl.exp()) {
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init = GenExpr(*decl.exp());
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} else {
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init = ir::DefaultContext().GetConstInt(0);
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}
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builder_.CreateStore(init, slot);
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}
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