[cfe-dev] compiling to/from std::string

[Joshua Housh]

Hi,

So I'm trying to take preprocessed source code (in the form of an
std::string) and compile it and have the resulting object code also be
outputted into string (bypassing the file system).

My current code:


CompilerInstance Clang;
TextDiagnosticBuffer DiagsBuffer;
CompilerInvocation Invocation;
Diagnostic Diags(&DiagsBuffer);

Clang.setDiagnostics(&Diags);
Clang.setDiagnosticClient(&
DiagsBuffer);
CompilerInvocation::CreateFromArgs(Invocation, (const char
**)argAddresses.begin(),
                                                      (const char
**)argAddresses.end(), Diags);
Clang.setInvocation(&Invocation);


FrontendOptions FeOpts = Clang.getFrontendOpts();
FeOpts.ProgramAction = frontend::EmitObj;
std::vector<std::pair<FrontendOptions::InputKind, std::string> > opts;
std::pair<FrontendOptions::InputKind, std::string>
p(FeOpts.IK_PreprocessedCXX, "source");
opts.push_back(p);
FeOpts.Inputs = opts;

Clang.createFileManager();
Clang.setTarget(TargetInfo::CreateTargetInfo(Clang.getDiagnostics(),

Clang.getTargetOpts()));
Clang.getTarget().setForcedLangOptions(Clang.getLangOpts());

// override the source file
llvm::MemoryBuffer* Buffer = llvm::MemoryBuffer::getMemBuffer(Source,
"source");

SourceManager SM(Diags);
Clang.setSourceManager(&SM);
FileManager& FM = Clang.getFileManager();
std::string sourceName("source");
const FileEntry* fe = FM.getVirtualFile(sourceName,
strlen(Buffer->getBufferStart()), time(NULL));
SM.overrideFileContents(fe, Buffer);

Clang.createPreprocessor();
llvm::LLVMContext llvmc;
Clang.setLLVMContext(&llvmc);

// set the output file
Clang.clearOutputFiles(false);
std::string objectCode;
llvm::raw_string_ostream* OS = new llvm::raw_string_ostream(objectCode);
llvm::sys::Path Path = llvm::sys::Path::GetCurrentDirectory();
llvm::StringRef PathName(Path.getBasename());
Clang.addOutputFile(PathName, OS);

// compile
EmitObjAction E;
E.BeginSourceFile(Clang, sourceName);
E.Execute();
E.EndSourceFile();


I get the following error in E.Execute():

FIXME: MCMachoStreamer:EmitFileDirective not implemented
clang: MCMachOStreamer.cpp:241: virtual
void<unnamed>::MCMachOStreamer::EmitSymbolAttribute(llvm::MCSymbol*,
llvm::MCSymbolAttr): Assertion `0 && "Invalid symbol attribute for Mach-O!"'
failed.

The backtrace looks like:
#0  0x00007ffff6c81a75 in *__GI_raise (sig=<value optimized out>) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00007ffff6c855c0 in *__GI_abort () at abort.c:92
#2  0x00007ffff6c7a941 in *__GI___assert_fail (assertion=0x1a5bb30 "0 &&
\"Invalid symbol attribute for Mach-O!\"",
    file=<value optimized out>, line=241,
    function=0x1a5ca80 "virtual
void<unnamed>::MCMachOStreamer::EmitSymbolAttribute(llvm::MCSymbol*,
llvm::MCSymbolAttr)") at assert.c:81
#3  0x0000000001338a41 in EmitSymbolAttribute (this=0x2322230,
Symbol=0x23240e0, Attribute=llvm::MCSA_ELF_TypeFunction)
    at MCMachOStreamer.cpp:241
#4  0x0000000000fb8802 in llvm::AsmPrinter::EmitFunctionHeader
(this=0x2322b00) at AsmPrinter.cpp:322
#5  0x0000000000d86fbe in llvm::X86AsmPrinter::runOnMachineFunction
(this=0x2322b00, MF=...) at X86AsmPrinter.cpp:70
#6  0x000000000103865d in llvm::MachineFunctionPass::runOnFunction
(this=0x2322b00, F=...) at MachineFunctionPass.cpp:33
#7  0x00000000013f9a2b in llvm::FPPassManager::runOnFunction
(this=0x23033c0, F=...) at PassManager.cpp:1418
#8  0x00000000013f96f5 in llvm::FunctionPassManagerImpl::run
(this=0x23025c0, F=...) at PassManager.cpp:1369
#9  0x00000000013f93a5 in llvm::FunctionPassManager::run (this=0x22edc70,
F=...) at PassManager.cpp:1299
#10 0x0000000000420a25 in EmitAssembly (this=0x22a4e20) at
CodeGenAction.cpp:467
#11 0x000000000041f512 in HandleTranslationUnit (this=0x22a4e20, C=...) at
CodeGenAction.cpp:165
#12 0x00000000006a0db3 in clang::ParseAST (PP=..., Consumer=0x22a4e20,
Ctx=..., PrintStats=false,
    CompleteTranslationUnit=true, CompletionConsumer=0x0) at
ParseAST.cpp:119
#13 0x0000000000441692 in clang::ASTFrontendAction::ExecuteAction
(this=0x7ffff6246ac0) at FrontendAction.cpp:229
#14 0x00000000004412cd in clang::FrontendAction::Execute
(this=0x7ffff6246ac0) at FrontendAction.cpp:155
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/cfe-dev/attachments/20100505/fe1f786d/attachment.html>