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#include "llvm.hpp"
LLVMState::LLVMState():
ctx(),
modul("forsp", ctx),
builder(ctx),
inttype(llvm::Type::getInt32Ty(ctx)),
stacktype(llvm::VectorType::get(inttype, 12, false)),
ftype(llvm::FunctionType::get(llvm::Type::getVoidTy(ctx), {}, false)),
one(llvm::ConstantInt::get(inttype, 1)),
zero(llvm::ConstantInt::get(inttype, 0))
{
auto zerovec = llvm::ConstantVector::get(llvm::ArrayRef(zero));
llvmSp = new llvm::GlobalVariable(modul, inttype, false,
llvm::GlobalValue::ExternalLinkage, zero, "sp");
llvmStack = new llvm::GlobalVariable(modul, stacktype, false,
llvm::GlobalValue::ExternalLinkage, zerovec, "stack");
}
llvm::Value *LLVMState::createPush()
{
auto dspval = builder.CreateLoad(inttype, llvmSp);
auto inc = builder.CreateAdd(dspval, one);
builder.CreateStore(inc, llvmSp, false);
return builder.CreateGEP(stacktype, llvmStack, {zero, dspval});
}
llvm::Value *LLVMState::createPop()
{
auto dspval = builder.CreateLoad(inttype, llvmSp);
auto dec = builder.CreateSub(dspval, one);
builder.CreateStore(dec, llvmSp, false);
return builder.CreateGEP(stacktype, llvmStack, {zero, dec});
}
llvm::Function *LLVMState::createFunction(const std::string& name)
{
return llvm::Function::Create(ftype, llvm::Function::ExternalLinkage,
name.c_str(), modul);
}
llvm::BasicBlock *LLVMState::createEntry(llvm::Function *func)
{
return llvm::BasicBlock::Create(ctx, "entry", func);
}
llvm::Value *LLVMState::createVariable(const std::string& name)
{
return new llvm::GlobalVariable(modul, inttype, false,
llvm::GlobalValue::InternalLinkage, zero, name);
}
llvm::Constant *LLVMState::createInt(int n)
{
return llvm::ConstantInt::get(ctx, llvm::APInt(32, n, true));
}
void LLVMState::output()
{
//std::cout << "LLVM:" << std::endl;
modul.print(llvm::errs(), nullptr);
}
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