forked from ppxf25tqu/nudt-compiler-cpp
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53 lines
1.3 KiB
53 lines
1.3 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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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("[irgen] 暂不支持的 blockItem 类型");
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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("[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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if (storage_map_.find(&decl) != storage_map_.end()) {
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throw std::runtime_error("[irgen] 声明重复生成存储槽位");
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}
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auto* slot = builder_.CreateAllocaI32(module_.context().NextTemp());
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storage_map_[&decl] = 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 = builder_.CreateConstInt(0);
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}
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builder_.CreateStore(init, slot);
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}
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