forked from NUDT-compiler/nudt-compiler-cpp
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56 lines
1.7 KiB
56 lines
1.7 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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ir::Value* IRGenImpl::GenExpr(SysYParser::ExpContext& expr) {
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if (!expr.addExp()) {
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throw std::runtime_error(FormatError("irgen", "非法表达式"));
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}
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return GenAddExpr(*expr.addExp());
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}
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ir::Value* IRGenImpl::GenAddExpr(SysYParser::AddExpContext& add) {
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// 当前表达式层次仍是最小实现，直接贴合 addExp -> primary 的语法形状。
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const auto& terms = add.primary();
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if (terms.empty()) {
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throw std::runtime_error(FormatError("irgen", "空加法表达式"));
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}
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ir::Value* acc = GenPrimary(*terms[0]);
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for (size_t i = 1; i < terms.size(); ++i) {
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ir::Value* rhs = GenPrimary(*terms[i]);
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std::string name = module_.context().NextTemp();
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acc = builder_.CreateBinary(ir::Opcode::Add, acc, rhs, name);
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}
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return acc;
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}
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ir::Value* IRGenImpl::GenPrimary(SysYParser::PrimaryContext& primary) {
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if (primary.Number()) {
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return builder_.CreateConstInt(std::stoi(primary.Number()->getText()));
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}
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if (primary.Ident()) {
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auto* decl = sema_.ResolveVarUse(&primary);
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if (!decl) {
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throw std::runtime_error(
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FormatError("irgen",
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"变量使用缺少语义绑定: " + primary.Ident()->getText()));
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}
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auto it = storage_map_.find(decl);
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if (it == storage_map_.end()) {
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throw std::runtime_error(
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FormatError("irgen",
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"变量声明缺少存储槽位: " + primary.Ident()->getText()));
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}
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return builder_.CreateLoad(it->second, module_.context().NextTemp());
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}
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if (primary.exp()) {
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return GenExpr(*primary.exp());
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}
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throw std::runtime_error(FormatError("irgen", "暂不支持的表达式形式"));
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}
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