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author | Stephen Hines <srhines@google.com> | 2014-04-23 16:57:46 -0700 |
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committer | Stephen Hines <srhines@google.com> | 2014-04-24 15:53:16 -0700 |
commit | 36b56886974eae4f9c5ebc96befd3e7bfe5de338 (patch) | |
tree | e6cfb69fbbd937f450eeb83bfb83b9da3b01275a /lib/Target/X86/X86TargetObjectFile.cpp | |
parent | 69a8640022b04415ae9fac62f8ab090601d8f889 (diff) | |
download | external_llvm-36b56886974eae4f9c5ebc96befd3e7bfe5de338.zip external_llvm-36b56886974eae4f9c5ebc96befd3e7bfe5de338.tar.gz external_llvm-36b56886974eae4f9c5ebc96befd3e7bfe5de338.tar.bz2 |
Update to LLVM 3.5a.
Change-Id: Ifadecab779f128e62e430c2b4f6ddd84953ed617
Diffstat (limited to 'lib/Target/X86/X86TargetObjectFile.cpp')
-rw-r--r-- | lib/Target/X86/X86TargetObjectFile.cpp | 77 |
1 files changed, 65 insertions, 12 deletions
diff --git a/lib/Target/X86/X86TargetObjectFile.cpp b/lib/Target/X86/X86TargetObjectFile.cpp index 086cd4d..0a88e98 100644 --- a/lib/Target/X86/X86TargetObjectFile.cpp +++ b/lib/Target/X86/X86TargetObjectFile.cpp @@ -8,38 +8,40 @@ //===----------------------------------------------------------------------===// #include "X86TargetObjectFile.h" +#include "llvm/IR/Mangler.h" +#include "llvm/IR/Operator.h" #include "llvm/MC/MCContext.h" #include "llvm/MC/MCExpr.h" #include "llvm/MC/MCSectionELF.h" #include "llvm/Support/Dwarf.h" -#include "llvm/Target/Mangler.h" +#include "llvm/Target/TargetLowering.h" using namespace llvm; using namespace dwarf; -const MCExpr *X86_64MachoTargetObjectFile:: -getTTypeGlobalReference(const GlobalValue *GV, Mangler *Mang, - MachineModuleInfo *MMI, unsigned Encoding, - MCStreamer &Streamer) const { +const MCExpr *X86_64MachoTargetObjectFile::getTTypeGlobalReference( + const GlobalValue *GV, unsigned Encoding, Mangler &Mang, + const TargetMachine &TM, MachineModuleInfo *MMI, + MCStreamer &Streamer) const { // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which // is an indirect pc-relative reference. if (Encoding & (DW_EH_PE_indirect | DW_EH_PE_pcrel)) { - const MCSymbol *Sym = getSymbol(*Mang, GV); + const MCSymbol *Sym = TM.getSymbol(GV, Mang); const MCExpr *Res = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext()); const MCExpr *Four = MCConstantExpr::Create(4, getContext()); return MCBinaryExpr::CreateAdd(Res, Four, getContext()); } - return TargetLoweringObjectFileMachO:: - getTTypeGlobalReference(GV, Mang, MMI, Encoding, Streamer); + return TargetLoweringObjectFileMachO::getTTypeGlobalReference( + GV, Encoding, Mang, TM, MMI, Streamer); } -MCSymbol *X86_64MachoTargetObjectFile:: -getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang, - MachineModuleInfo *MMI) const { - return getSymbol(*Mang, GV); +MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol( + const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM, + MachineModuleInfo *MMI) const { + return TM.getSymbol(GV, Mang); } void @@ -53,3 +55,54 @@ X86LinuxTargetObjectFile::getDebugThreadLocalSymbol( const MCSymbol *Sym) const { return MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext()); } + +const MCExpr *X86WindowsTargetObjectFile::getExecutableRelativeSymbol( + const ConstantExpr *CE, Mangler &Mang, const TargetMachine &TM) const { + // We are looking for the difference of two symbols, need a subtraction + // operation. + const SubOperator *Sub = dyn_cast<SubOperator>(CE); + if (!Sub) + return 0; + + // Symbols must first be numbers before we can subtract them, we need to see a + // ptrtoint on both subtraction operands. + const PtrToIntOperator *SubLHS = + dyn_cast<PtrToIntOperator>(Sub->getOperand(0)); + const PtrToIntOperator *SubRHS = + dyn_cast<PtrToIntOperator>(Sub->getOperand(1)); + if (!SubLHS || !SubRHS) + return 0; + + // Our symbols should exist in address space zero, cowardly no-op if + // otherwise. + if (SubLHS->getPointerAddressSpace() != 0 || + SubRHS->getPointerAddressSpace() != 0) + return 0; + + // Both ptrtoint instructions must wrap global variables: + // - Only global variables are eligible for image relative relocations. + // - The subtrahend refers to the special symbol __ImageBase, a global. + const GlobalVariable *GVLHS = + dyn_cast<GlobalVariable>(SubLHS->getPointerOperand()); + const GlobalVariable *GVRHS = + dyn_cast<GlobalVariable>(SubRHS->getPointerOperand()); + if (!GVLHS || !GVRHS) + return 0; + + // We expect __ImageBase to be a global variable without a section, externally + // defined. + // + // It should look something like this: @__ImageBase = external constant i8 + if (GVRHS->isThreadLocal() || GVRHS->getName() != "__ImageBase" || + !GVRHS->hasExternalLinkage() || GVRHS->hasInitializer() || + GVRHS->hasSection()) + return 0; + + // An image-relative, thread-local, symbol makes no sense. + if (GVLHS->isThreadLocal()) + return 0; + + return MCSymbolRefExpr::Create(TM.getSymbol(GVLHS, Mang), + MCSymbolRefExpr::VK_COFF_IMGREL32, + getContext()); +} |