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我正在创建铛工具,我想从ngng AST生成LLVM IR。我知道-emit-llvm
选项,我可以用它来获得* .ll文件,但有办法在代码中生成IR?我可以调用的一些方法需要使用AST或AST上下文,并返回llvm::Module
?我找不到任何显示此内容的示例。创建LLVM IR的方法
编辑: 所以我尝试使用CodeGenAction这个,但我不能让它工作。我结束了无法解析的外部符号错误。我错过了什么吗?
#include <clang/CodeGen/CodeGenAction.h>
#include <clang/Frontend/CompilerInstance.h>
#include <clang/Frontend/CompilerInvocation.h>
#include <clang/Basic/DiagnosticOptions.h>
#include <clang/Frontend/TextDiagnosticPrinter.h>
#include <llvm/ADT/IntrusiveRefCntPtr.h>
#include <llvm/IR/Module.h>
#include <llvm/IR/LLVMContext.h>
using namespace std;
clang::CodeGenAction * getAction(void)
{
// Path to the C file
string inputPath = "test.c";
// Arguments to pass to the clang frontend
vector<const char *> args;
args.push_back(inputPath.c_str());
// The compiler invocation needs a DiagnosticsEngine so it can report problems
clang::DiagnosticOptions opt = clang::DiagnosticOptions();
clang::TextDiagnosticPrinter *DiagClient = new clang::TextDiagnosticPrinter(llvm::errs(), &opt);
llvm::IntrusiveRefCntPtr<clang::DiagnosticIDs> DiagID(new clang::DiagnosticIDs());
clang::DiagnosticsEngine Diags(DiagID, &opt, DiagClient);
// Create the compiler invocation
clang::CompilerInvocation* CI(new clang::CompilerInvocation());
clang::CompilerInvocation::CreateFromArgs(*CI, &args[0], &args[0] + args.size(), Diags);
// Create the compiler instance
clang::CompilerInstance Clang;
Clang.setInvocation(CI);
// Get ready to report problems
Clang.createDiagnostics(&Diags.getDiagnosticOptions());
if (!Clang.hasDiagnostics())
return NULL;
// Create an action and make the compiler instance carry it out
clang::CodeGenAction *Act = new clang::EmitLLVMOnlyAction(&llvm::getGlobalContext());
if (!Clang.ExecuteAction(*Act))
return NULL;
return Act;
}
int main(void)
{
clang::CodeGenAction* Act = getAction();
// Grab the module built by the EmitLLVMOnlyAction
std::unique_ptr<llvm::Module> module = Act->takeModule();
// Print all functions in the module
for (llvm::Module::FunctionListType::iterator i = module->getFunctionList().begin(); i != module->getFunctionList().end(); ++i)
printf("%s\n", i->getName().str().c_str());
return 0;
}
错误,我在连接过程中有:
LNK1120: 2 unresolved externals
LNK2001: unresolved external symbol "public: __thiscall clang::EmitLLVMOnlyAction::EmitLLVMOnlyAction(class llvm::LLVMContext *)" ([email protected]@@[email protected]@[email protected]@@Z)
LNK2001: unresolved external symbol "public: class std::unique_ptr<class llvm::Module,struct std::default_delete<class llvm::Module> > __thiscall clang::CodeGenAction::takeModule(void)" ([email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@@[email protected]@XZ)
谢谢,我试过了,但是我无法完成它的工作。我结束了无法解决的外部错误,所以我用'CodeGenAction'试了一下,结果出现了类似的错误。我编辑了原始答案。任何提示? – benderto 2014-12-16 10:26:08
@benderto缺少的符号在CodeGenAction.cpp中声明,因此您必须:使用您的应用程序编译CodeGenAction.cpp,或者b:将叮当CodeGen库链接到您的应用程序。 – 2014-12-16 10:42:56