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Provide a dummy section to fix a crash with inline assembly in LTO.

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Fixes pr18508.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199843 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2014-01-22 22:11:14 +00:00
parent efa1355495
commit a73e920f09
2 changed files with 30 additions and 1 deletions
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27
lib/LTO/LTOModule.cpp
View File

@ -24,6 +24,7 @@
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCParser/MCAsmParser.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
@ -532,10 +533,32 @@ LTOModule::addPotentialUndefinedSymbol(const GlobalValue *decl, bool isFunc) {
}
namespace {
// Common infrastructure is allowed to assume the existence of a current
// section. Since this streamer doesn't need one itself, we just provide
// a dummy one.
class DummySection : public MCSection {
public:
DummySection() : MCSection(SV_ELF, SectionKind::getText()) {}
virtual void PrintSwitchToSection(const MCAsmInfo &MAI, raw_ostream &OS,
const MCExpr *Subsection) const {}
virtual std::string getLabelBeginName() const { return ""; }
virtual std::string getLabelEndName() const { return ""; }
virtual bool UseCodeAlign() const { return false; }
virtual bool isVirtualSection() const { return false; }
};
class RecordStreamer : public MCStreamer {
public:
enum State { NeverSeen, Global, Defined, DefinedGlobal, Used };
DummySection TheSection;
private:
StringMap<State> Symbols;
@ -621,7 +644,9 @@ namespace {
return Symbols.end();
}
RecordStreamer(MCContext &Context) : MCStreamer(Context, 0) {}
RecordStreamer(MCContext &Context) : MCStreamer(Context, 0) {
SwitchSection(&TheSection);
}
virtual void EmitInstruction(const MCInst &Inst) {
// Scan for values.

4
test/LTO/current-section.ll Normal file
View File

@ -0,0 +1,4 @@
; RUN: llvm-as < %s >%t1
; RUN: llvm-lto -o %t2 %t1
module asm ".align 4"