Question

以下是打印LLVM IR的hello world的代码：

#include "llvm/ADT/ArrayRef.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/IRBuilder.h"
#include <vector>
#include <string>

int main() {
    llvm::LLVMContext &Context = llvm::getGlobalContext();
    llvm::IRBuilder<> builder(Context);
    llvm::Module *pModule = new llvm::Module("hello world", Context);
    llvm::FunctionType *funcType = llvm::FunctionType::get(builder.getInt32Ty(), false);
    llvm::Function *mainFunc = llvm::Function::Create(funcType, llvm::Function::ExternalLinkage, "main", pModule);
    llvm::BasicBlock *pEntryBB  = llvm::BasicBlock::Create(Context, "EntryPoint", mainFunc);
    builder.SetInsertPoint(pEntryBB);
    llvm::Value *pHelloWorldStr = builder.CreateGlobalStringPtr("hello world!\n");
    std::vector<llvm::Type *> PrintfProtoArgs;
    PrintfProtoArgs.push_back(builder.getInt8Ty()->getPointerTo());
    llvm::ArrayRef<llvm::Type*> argsRef(PrintfProtoArgs);
    llvm::FunctionType *pPrintfType = llvm::FunctionType::get(builder.getInt32Ty(), argsRef, false);
    llvm::Constant *pPrintfFunc = pModule->getOrInsertFunction("printf", pPrintfType);
    builder.CreateCall(pPrintfFunc, pHelloWorldStr);
    builder.CreateRetVoid();
    pModule->dump();

    return 0;
}

我正在尝试丢弃llvm::IRBuilder<>并将其替换为某些Module / Function / BasicBlock指定的函数：

builder.CreateCall - ＆gt; llvm::CallInst::llvm::CallInst::Create(pPrintfFunc, pHelloWorldStr, "callPrintf", pEntryBB)

builder.CreateRetVoid() - ＆gt; llvm::ReturnInst::Create(Context, pConsIntZero, pEntryBB);

builder.getInt32Ty() - ＆gt; llvm::Type::getInt32Ty(Context)

现在的问题是我找不到CreateGlobalStringPtr的替代方案：

llvm::Value *pHelloWorldStr = builder.CreateGlobalStringPtr("hello world!\n");

那么，如何在不使用构建器的情况下声明全局字符串指针？

我认为在每种情况下都不需要llvm::IRBuilder。有没有一种简单的方法可以找到这样的替代功能？

如何在不使用llvm :: IRBuilder的情况下声明全局字符串指针

0 个答案: