From bd44c9eaef1f4dcbbd98d4489885566b6c7e5138 Mon Sep 17 00:00:00 2001
From: Nagi5Yeq <wu@x-nagi.com>
Date: Sun, 31 May 2020 04:03:00 +0800
Subject: support for type alias

---
 node/FunctionNode.cc | 36 ++++++++++++++++++++++--------------
 1 file changed, 22 insertions(+), 14 deletions(-)

(limited to 'node/FunctionNode.cc')

diff --git a/node/FunctionNode.cc b/node/FunctionNode.cc
index c85297b..97b1680 100644
--- a/node/FunctionNode.cc
+++ b/node/FunctionNode.cc
@@ -7,17 +7,19 @@
 #include "DeclNode.hh"
 #include "FunctionNode.hh"
 #include "Log.hh"
+#include "TypeIdentifier.hh"
 
 namespace pcc {
 FunctionNode::FunctionNode(
     Context* context, std::string&& name, std::list<Declaration>&& arguments,
     std::list<std::shared_ptr<DeclNode>>&& LocalDeclarations,
-    std::shared_ptr<Type> ReturnType, std::shared_ptr<StatementListNode> body)
+    std::shared_ptr<TypeIdentifier> ReturnTypeIdentifier,
+    std::shared_ptr<StatementListNode> body)
     : BaseNode(context)
     , name_(std::move(name))
     , arguments_(std::move(arguments))
     , LocalDeclarations_(std::move(LocalDeclarations))
-    , ReturnType_(ReturnType)
+    , ReturnTypeIdentifier_(ReturnTypeIdentifier)
     , locals_(context->GetGlobals())
     , body_(body) {
     for (auto&& decl : LocalDeclarations_) {
@@ -30,45 +32,51 @@ Value FunctionNode::CodeGen() {
     llvm::IRBuilder<>* builder = context_->GetBuilder();
     TypeManager* manager = context_->GetTypeManager();
     std::vector<std::shared_ptr<Type>> params(arguments_.size());
-    std::transform(arguments_.cbegin(), arguments_.cend(), params.begin(),
-                   [](const Declaration& decl) { return std::get<1>(decl); });
+    std::transform(
+        arguments_.cbegin(), arguments_.cend(), params.begin(),
+        [](const Declaration& decl) { return std::get<1>(decl)->GetType(); });
+    std::shared_ptr<Type> ReturnType = ReturnTypeIdentifier_->GetType();
     std::shared_ptr<FunctionType> type =
-        manager->CreateFunctionType(ReturnType_, params);
+        manager->CreateFunctionType(ReturnType, params);
     llvm::FunctionType* LLVMType =
         llvm::cast<llvm::FunctionType>(type->GetLLVMType());
     llvm::Function* function = llvm::Function::Create(
         LLVMType, llvm::GlobalValue::ExternalLinkage, name_, *module);
     function->setCallingConv(llvm::CallingConv::C);
+
     context_->AddFunction(name_, {type, function});
     llvm::BasicBlock* block =
         llvm::BasicBlock::Create(GlobalLLVMContext, name_, function);
     Log(LogLevel::PCC_INFO, "generating function %s of type %s", name_.c_str(),
         type->GetCommonName());
     builder->SetInsertPoint(block);
+    context_->PushScope(&locals_);
     // alloc arguments
     llvm::Function::arg_iterator ArgIt = function->arg_begin();
+    decltype(params)::iterator ParamIt = params.begin();
     for (auto&& arg : arguments_) {
-        Value ArgValue = builder->CreateAlloca(std::get<1>(arg)->GetLLVMType());
-        builder->CreateStore(ArgIt++, ArgValue);
-        locals_.Add(std::get<0>(arg),
-                    {manager->GetPointerType(std::get<1>(arg)), ArgValue});
+        std::shared_ptr<Type> ArgType = *ParamIt;
+        Value ArgValue = builder->CreateAlloca(ArgType->GetLLVMType());
+        builder->CreateStore(ArgIt, ArgValue);
+        locals_.AddVariable(std::get<0>(arg),
+                            {manager->GetPointerType(ArgType), ArgValue});
+        ++ArgIt, ++ParamIt;
     }
     // alloc local variables
     for (auto&& decl : LocalDeclarations_) {
         decl->CodeGen();
     }
     Value rv = nullptr;
-    bool IsVoid = ReturnType_ == manager->GetBuiltinType(BuiltinType::VOID);
+    bool IsVoid = ReturnType == manager->GetBuiltinType(BuiltinType::VOID);
     if (IsVoid == false) {
         // create a variable with the same name as the function for return value
-        rv = builder->CreateAlloca(ReturnType_->GetLLVMType());
-        locals_.Add(name_, {manager->GetPointerType(ReturnType_), rv});
+        rv = builder->CreateAlloca(ReturnType->GetLLVMType());
+        locals_.AddVariable(name_, {manager->GetPointerType(ReturnType), rv});
     }
     // push the function scope variables
-    context_->PushScope(&locals_);
     body_->CodeGen();
     if (IsVoid == false) {
-        builder->CreateRet(builder->CreateLoad(ReturnType_->GetLLVMType(), rv));
+        builder->CreateRet(builder->CreateLoad(ReturnType->GetLLVMType(), rv));
     } else {
         builder->CreateRetVoid();
     }
-- 
cgit