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Show better errors for LLVM IR output

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I was trying to output LLVM IR directly to the console:

    $ rustc hello.rs --emit=llvm-ir -o /dev/stdout
    LLVM ERROR: IO failure on output stream: Bad file descriptor

Now `LLVMRustPrintModule` returns an error, and we print:

    error: failed to write LLVM IR to /dev/stdout.hello.7rcbfp3g-cgu.0.rcgu.ll: Permission denied

... which is more informative.
This commit is contained in:
Josh Stone
2019-04-05 17:48:23 -07:00
parent acd8dd6a50
commit aafe2c6da9
3 changed files with 26 additions and 13 deletions
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11
src/rustllvm/PassWrapper.cpp
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@@ -646,8 +646,9 @@ char RustPrintModulePass::ID = 0;
INITIALIZE_PASS(RustPrintModulePass, "print-rust-module",
"Print rust module to stderr", false, false)
extern "C" void LLVMRustPrintModule(LLVMPassManagerRef PMR, LLVMModuleRef M,
const char *Path, DemangleFn Demangle) {
extern "C" LLVMRustResult
LLVMRustPrintModule(LLVMPassManagerRef PMR, LLVMModuleRef M,
const char *Path, DemangleFn Demangle) {
llvm::legacy::PassManager *PM = unwrap<llvm::legacy::PassManager>(PMR);
std::string ErrorInfo;
@@ -655,12 +656,18 @@ extern "C" void LLVMRustPrintModule(LLVMPassManagerRef PMR, LLVMModuleRef M,
raw_fd_ostream OS(Path, EC, sys::fs::F_None);
if (EC)
ErrorInfo = EC.message();
if (ErrorInfo != "") {
LLVMRustSetLastError(ErrorInfo.c_str());
return LLVMRustResult::Failure;
}
formatted_raw_ostream FOS(OS);
PM->add(new RustPrintModulePass(FOS, Demangle));
PM->run(*unwrap(M));
return LLVMRustResult::Success;
}
extern "C" void LLVMRustPrintPasses() {