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[llvm-dwp] Use buffer_stream if output file is not seekable (e.g. "-")

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Reviewers: dblaikie, pcc

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D51707

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341509 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Fangrui Song 2018-09-06 00:06:25 +00:00
parent d2d8db6d7a
commit 92c8fe0a62
2 changed files with 11 additions and 5 deletions
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6
test/tools/llvm-dwp/X86/merge.test
View File

@ -1,7 +1,5 @@
RUN: llvm-dwp %p/../Inputs/merge/notypes/c.dwo %p/../Inputs/merge/notypes/ab.dwp -o %t
RUN: llvm-dwarfdump -v %t | FileCheck --check-prefix=CHECK --check-prefix=NOTYP %s
FIXME: For some reason, piping straight from llvm-dwp to llvm-dwarfdump -v doesn't behave well - looks like dwarfdump is reading/closes before dwp has finished.
RUN: llvm-dwp %p/../Inputs/merge/notypes/c.dwo %p/../Inputs/merge/notypes/ab.dwp -o - | \
RUN: llvm-dwarfdump -v - | FileCheck --check-prefix=CHECK --check-prefix=NOTYP %s
DWP from a DWO (c.dwo) and a DWP (ab.dwp, created from a.dwo and b.dwo)
Make sure the entries for A and B are updated correctly when read/processed from ab.dwp

10
tools/llvm-dwp/llvm-dwp.cpp
View File

@ -697,13 +697,21 @@ int main(int argc, char **argv) {
// Create the output file.
std::error_code EC;
raw_fd_ostream OutFile(OutputFilename, EC, sys::fs::F_None);
Optional<buffer_ostream> BOS;
raw_pwrite_stream *OS;
if (EC)
return error(Twine(OutputFilename) + ": " + EC.message(), Context);
if (OutFile.supportsSeeking()) {
OS = &OutFile;
} else {
BOS.emplace(OutFile);
OS = BOS.getPointer();
}
MCTargetOptions MCOptions = InitMCTargetOptionsFromFlags();
std::unique_ptr<MCStreamer> MS(TheTarget->createMCObjectStreamer(
TheTriple, MC, std::unique_ptr<MCAsmBackend>(MAB),
MAB->createObjectWriter(OutFile), std::unique_ptr<MCCodeEmitter>(MCE),
MAB->createObjectWriter(*OS), std::unique_ptr<MCCodeEmitter>(MCE),
*MSTI, MCOptions.MCRelaxAll, MCOptions.MCIncrementalLinkerCompatible,
/*DWARFMustBeAtTheEnd*/ false));
if (!MS)