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[BOLT] Add BinarySection::flushPendingRelocations() 

(cherry picked from FBD18623527)
This commit is contained in:
Maksim Panchenko 2019-11-20 00:16:19 -08:00
parent 3b1b9916dd
commit b07e870d78
3 changed files with 25 additions and 17 deletions
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20
bolt/src/BinarySection.cpp
View File

@ -109,6 +109,26 @@ void BinarySection::emitAsData(MCStreamer &Streamer, StringRef NewName) const {
Streamer.EmitLabel(BC.Ctx->getOrCreateSymbol("__hot_data_end"));
}
void BinarySection::flushPendingRelocations(raw_pwrite_stream &OS) {
DEBUG(dbgs() << "BOLT-DEBUG: flushing pending relocs for section "
<< getName() << '\n');
for (auto &Reloc : PendingRelocations) {
DEBUG(dbgs() << "BOLT-DEBUG: writing value 0x"
<< Twine::utohexstr(Reloc.Addend)
<< " of size " << Relocation::getSizeForType(Reloc.Type)
<< " at offset 0x"
<< Twine::utohexstr(Reloc.Offset) << '\n');
assert(Reloc.Type == ELF::R_X86_64_32 &&
"only R_X86_64_32 relocations are supported at the moment");
const uint32_t Value = Reloc.Addend;
OS.pwrite(reinterpret_cast<const char*>(&Value),
Relocation::getSizeForType(Reloc.Type),
FileOffset + Reloc.Offset);
}
clearList(PendingRelocations);
}
BinarySection::~BinarySection() {
if (isReordered()) {
delete[] getData();

3
bolt/src/BinarySection.h
View File

@ -414,6 +414,9 @@ public:
// for the section during emission if non-empty.
void emitAsData(MCStreamer &Streamer, StringRef NewName = StringRef()) const;
/// Flush all pending relocations to the emitted section.
void flushPendingRelocations(raw_pwrite_stream &OS);
/// Reorder the contents of this section according to /p Order. If
/// /p Inplace is true, the entire contents of the section is reordered,
/// otherwise the new contents contain only the reordered data.

19
bolt/src/RewriteInstance.cpp
View File

@ -3748,23 +3748,8 @@ void RewriteInstance::rewriteNoteSections() {
Size += BSec->getOutputSize();
}
if (BSec->hasPendingRelocations()) {
DEBUG(dbgs() << "BOLT-DEBUG: processing relocs for section "
<< SectionName << '\n');
for (auto &Reloc : BSec->pendingRelocations()) {
DEBUG(dbgs() << "BOLT-DEBUG: writing value 0x"
<< Twine::utohexstr(Reloc.Addend)
<< " of size " << Relocation::getSizeForType(Reloc.Type)
<< " at offset 0x"
<< Twine::utohexstr(Reloc.Offset) << '\n');
assert(Reloc.Type == ELF::R_X86_64_32 &&
"only R_X86_64_32 relocations are supported at the moment");
uint32_t Value = Reloc.Addend;
OS.pwrite(reinterpret_cast<const char*>(&Value),
Relocation::getSizeForType(Reloc.Type),
NextAvailableOffset + Reloc.Offset);
}
}
BSec->setFileOffset(NextAvailableOffset);
BSec->flushPendingRelocations(OS);
}
// Set/modify section info.