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Stop producing func.eh symbols on Darwin.

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According Nick Kledzik (http://llvm.org/bugs/show_bug.cgi?id=19430#c2):
"... mach-o no longer needs names in the __eh_frame section (and has not for
years)."

Iain Sandoe confirms it is also unnecessary for their old darwin support.

llvm-svn: 211500
This commit is contained in:
Rafael Espindola 2014-06-23 15:13:23 +00:00
parent 1c8d56c257
commit ef6d0a2950
5 changed files with 1 additions and 44 deletions
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9
include/llvm/MC/MCObjectFileInfo.h
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@ -33,12 +33,6 @@ protected:
/// weak_definition of constant 0 for an omitted EH frame.
bool SupportsWeakOmittedEHFrame;
/// IsFunctionEHFrameSymbolPrivate - This flag is set to true if the
/// "EH_frame" symbol for EH information should be an assembler temporary (aka
/// private linkage, aka an L or .L label) or false if it should be a normal
/// non-.globl label. This defaults to true.
bool IsFunctionEHFrameSymbolPrivate;
/// SupportsCompactUnwindWithoutEHFrame - True if the target object file
/// supports emitting a compact unwind section without an associated EH frame
/// section.
@ -201,9 +195,6 @@ public:
void InitMCObjectFileInfo(StringRef TT, Reloc::Model RM, CodeModel::Model CM,
MCContext &ctx);
bool isFunctionEHFrameSymbolPrivate() const {
return IsFunctionEHFrameSymbolPrivate;
}
bool getSupportsWeakOmittedEHFrame() const {
return SupportsWeakOmittedEHFrame;
}

7
lib/MC/MCDwarf.cpp
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@ -1459,13 +1459,6 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCObjectStreamer &streamer,
const MCObjectFileInfo *MOFI = context.getObjectFileInfo();
bool verboseAsm = streamer.isVerboseAsm();
if (IsEH && frame.Function && !MOFI->isFunctionEHFrameSymbolPrivate()) {
MCSymbol *EHSym =
context.GetOrCreateSymbol(frame.Function->getName() + Twine(".eh"));
streamer.EmitEHSymAttributes(frame.Function, EHSym);
streamer.EmitLabel(EHSym);
}
// Length
const MCExpr *Length = MakeStartMinusEndExpr(streamer, *fdeStart, *fdeEnd, 0);
if (verboseAsm) streamer.AddComment("FDE Length");

2
lib/MC/MCObjectFileInfo.cpp
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@ -41,7 +41,6 @@ static bool useCompactUnwind(const Triple &T) {
void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) {
// MachO
IsFunctionEHFrameSymbolPrivate = false;
SupportsWeakOmittedEHFrame = false;
if (T.isOSDarwin() &&
@ -802,7 +801,6 @@ void MCObjectFileInfo::InitMCObjectFileInfo(StringRef T, Reloc::Model relocm,
// Common.
CommDirectiveSupportsAlignment = true;
SupportsWeakOmittedEHFrame = true;
IsFunctionEHFrameSymbolPrivate = true;
SupportsCompactUnwindWithoutEHFrame = false;
PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =

2
test/MC/MachO/eh-frame-reloc.s
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@ -24,7 +24,7 @@ _bar:
// OLD64: Relocations [
// OLD64-NEXT: Section __eh_frame {
// OLD64-NEXT: 0x20 0 3 1 X86_64_RELOC_SUBTRACTOR 0 _bar.eh
// OLD64-NEXT: 0x20 0 3 0 X86_64_RELOC_SUBTRACTOR 0
// OLD64-NEXT: 0x20 0 3 1 X86_64_RELOC_UNSIGNED 0 _bar
// OLD64-NEXT: }
// OLD64-NEXT: ]

25
test/MC/MachO/eh-symbols.s
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@ -1,25 +0,0 @@
// RUN: llvm-mc -filetype=obj -triple i686-apple-darwin %s -o - | llvm-readobj -t | FileCheck %s
// Make sure that the exception handling data has the same visibility as the
// function it's generated for.
.private_extern _main
.globl _main
_main:
.cfi_startproc
retl
.cfi_endproc
"_-[NSString(local) isNullOrNil]":
.cfi_startproc
retl
.cfi_endproc
// CHECK: Name: _-[NSString(local) isNullOrNil].eh
// CHECK: Name: _main
// CHECK-NEXT: PrivateExtern
// CHECK: Name: _main.eh
// CHECK-NEXT: PrivateExtern