fix(ir): 修改了一下context的管理

src/irgen/IRGenDecl.cpp

@@ -39,14 +39,14 @@ void IRGenImpl::GenVarDecl(SysYParser::VarDeclContext& decl) {
   if (storage_map_.find(&decl) != storage_map_.end()) {
     throw std::runtime_error("[irgen] 声明重复生成存储槽位");
   }
-  auto* slot = builder_.CreateAllocaI32(ir::DefaultContext().NextTemp());
+  auto* slot = builder_.CreateAllocaI32(module_.context().NextTemp());
   storage_map_[&decl] = slot;
 
   ir::Value* init = nullptr;
   if (decl.exp()) {
     init = GenExpr(*decl.exp());
   } else {
-    init = ir::DefaultContext().GetConstInt(0);
+    init = builder_.CreateConstInt(0);
   }
   builder_.CreateStore(init, slot);
 }

src/irgen/IRGenFunc.cpp

@@ -20,7 +20,10 @@ void VerifyFunctionStructure(const ir::Function& func) {
 }  // namespace
 
 IRGenImpl::IRGenImpl(ir::Module& module, const SemanticContext& sema)
-    : module_(module), sema_(sema), func_(nullptr), builder_(nullptr) {}
+    : module_(module),
+      sema_(sema),
+      func_(nullptr),
+      builder_(module.context(), nullptr) {}
 
 void IRGenImpl::Gen(SysYParser::CompUnitContext& cu) {
   if (!cu.funcDef()) {
@@ -37,7 +40,9 @@ void IRGenImpl::GenFuncDef(SysYParser::FuncDefContext& func) {
     throw std::runtime_error("[irgen] 缺少函数名");
   }
 
-  func_ = module_.CreateFunction(func.Ident()->getText(), ir::Type::Int32());
+  func_ = module_.CreateFunction(
+      func.Ident()->getText(),
+      std::make_shared<ir::Type>(ir::Type::Kind::Int32));
   builder_.SetInsertPoint(func_->entry());
   storage_map_.clear();