From 8886dc29cd311a78fd1f672904fd9a3af51c883c Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Wed, 16 Sep 2009 01:46:41 +0000 Subject: Big change #1 for personality function references: Eliminate the PersonalityPrefix/Suffix & NeedsIndirectEncoding fields from MAI: they aren't part of the asm syntax, they are related to the structure of the object file. To replace their functionality, add a new TLOF::getSymbolForDwarfGlobalReference method which asks targets to decide how to reference a global from EH in a pc-relative way. The default implementation just returns the symbol. The default darwin implementation references the symbol through an indirect $non_lazy_ptr stub. The bizarro x86-64 darwin specialization handles the weird "foo@GOTPCREL+4" hack. DwarfException.cpp now uses this to emit the reference to the symbol in the right way, and this also eliminates another horrible hack from DwarfException.cpp: - if (strcmp(MAI->getPersonalitySuffix(), "+4@GOTPCREL")) - O << "-" << MAI->getPCSymbol(); git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81991 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/X86/X86TargetObjectFile.cpp | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 lib/Target/X86/X86TargetObjectFile.cpp (limited to 'lib/Target/X86/X86TargetObjectFile.cpp') diff --git a/lib/Target/X86/X86TargetObjectFile.cpp b/lib/Target/X86/X86TargetObjectFile.cpp new file mode 100644 index 0000000..ce0b8bf --- /dev/null +++ b/lib/Target/X86/X86TargetObjectFile.cpp @@ -0,0 +1,33 @@ +//===-- llvm/Target/X86/X86TargetObjectFile.cpp - X86 Object Info ---------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#include "X86TargetObjectFile.h" +#include "llvm/ADT/SmallString.h" +#include "llvm/Support/Mangler.h" +#include "llvm/MC/MCExpr.h" +using namespace llvm; + +const MCExpr *X8664_MachoTargetObjectFile:: +getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang, + bool &IsIndirect, bool &IsPCRel) const { + + // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which + // is an indirect pc-relative reference. + IsIndirect = true; + IsPCRel = true; + + SmallString<128> Name; + Mang->getNameWithPrefix(Name, GV, false); + Name += "@GOTPCREL"; + const MCExpr *Res = + MCSymbolRefExpr::Create(Name.str(), getContext()); + const MCExpr *Four = MCConstantExpr::Create(4, getContext()); + return MCBinaryExpr::CreateAdd(Res, Four, getContext()); +} + -- cgit v1.1