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Big change #1 for personality function references:

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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
This commit is contained in:
Chris Lattner
2009-09-16 01:46:41 +00:00
parent 7c748661ce
commit 8c6ed05157
11 changed files with 172 additions and 56 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Target/TargetLoweringObjectFile.cpp
+39
View File
@@ -18,6 +18,7 @@
#include "llvm/Function.h"
#include "llvm/GlobalVariable.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/Target/TargetData.h"
@@ -275,6 +276,30 @@ TargetLoweringObjectFile::getSectionForConstant(SectionKind Kind) const {
return DataSection;
}
/// getSymbolForDwarfGlobalReference - Return an MCExpr to use for a
/// pc-relative reference to the specified global variable from exception
/// handling information. In addition to the symbol, this returns
/// by-reference:
///
/// IsIndirect - True if the returned symbol is actually a stub that contains
/// the address of the symbol, false if the symbol is the global itself.
///
/// IsPCRel - True if the symbol reference is already pc-relative, false if
/// the caller needs to subtract off the address of the reference from the
/// symbol.
///
const MCExpr *TargetLoweringObjectFile::
getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
bool &IsIndirect, bool &IsPCRel) const {
// The generic implementation of this just returns a direct reference to the
// symbol.
IsIndirect = false;
IsPCRel = false;
SmallString<128> Name;
Mang->getNameWithPrefix(Name, GV, false);
return MCSymbolRefExpr::Create(Name.str(), getContext());
}
//===----------------------------------------------------------------------===//
@@ -929,6 +954,19 @@ shouldEmitUsedDirectiveFor(const GlobalValue *GV, Mangler *Mang) const {
return true;
}
const MCExpr *TargetLoweringObjectFileMachO::
getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
bool &IsIndirect, bool &IsPCRel) const {
// The mach-o version of this method defaults to returning a stub reference.
IsIndirect = true;
IsPCRel = false;
SmallString<128> Name;
Mang->getNameWithPrefix(Name, GV, true);
Name += "$non_lazy_ptr";
return MCSymbolRefExpr::Create(Name.str(), getContext());
}
//===----------------------------------------------------------------------===//
// COFF
@@ -1046,3 +1084,4 @@ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
return getDataSection();
}