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#include <llvm/IR/IRBuilder.h>
#include "DeclNode.hh"
namespace pcc {
DeclNode::DeclNode(Context* context, VariableList* scope)
: BaseNode(context)
, scope_(scope) {}
void DeclNode::SetScope(VariableList* scope) { scope_ = scope; }
VarDeclNode::VarDeclNode(Context* context, VariableList* scope,
std::list<Declaration>&& decls)
: DeclNode(context, scope)
, decls_(std::move(decls)) {}
// if the scope is nullptr, this vardecl is in global scope. global variables
// are static, while local variables are allocated on stack.
Value VarDeclNode::CodeGen() {
llvm::IRBuilder<>* builder = context_->GetBuilder();
if (scope_ != nullptr) {
for (auto&& decl : decls_) {
Value value =
builder->CreateAlloca(std::get<1>(decl)->GetLLVMType());
scope_->Add(std::get<0>(decl), {std::get<1>(decl), value});
}
return nullptr;
}
// global variable case
VariableList* globals = context_->GetGlobals();
for (auto&& decl : decls_) {
llvm::Constant* value = new llvm::GlobalVariable(
*context_->GetModule(), std::get<1>(decl)->GetLLVMType(), false,
llvm::GlobalVariable::PrivateLinkage, nullptr);
globals->Add(std::get<0>(decl), {std::get<1>(decl), value});
}
return nullptr;
}
ConstDeclNode::ConstDeclNode(Context* context, VariableList* scope,
std::list<Constant>&& decls)
: DeclNode(context, scope)
, decls_(std::move(decls)) {}
// for constants, we don't need to allocate them on stack, both global and local
// constants are static.
Value ConstDeclNode::CodeGen() {
scope_ = (scope_ == nullptr ? context_->GetGlobals() : scope_);
for (auto&& decl : decls_) {
std::shared_ptr<ExprNode> ValueNode = std::get<1>(decl);
Value value = ValueNode->CodeGen();
std::shared_ptr<Type> type = ValueNode->GetType();
llvm::Constant* constant = new llvm::GlobalVariable(
*context_->GetModule(), type->GetLLVMType(), true,
llvm::GlobalValue::PrivateLinkage,
llvm::cast<llvm::Constant>(value));
scope_->Add(std::get<0>(decl), {type, constant});
}
return nullptr;
}
} // namespace pcc
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