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Factor a bit of code to MCStreamer::EmitLabel. Keep track of the last

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non private symbol. This will be use for handling

foo:
  .cfi_startproc
  ...

On OS X where we have to create a foo.eh symbol.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130305 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2011-04-27 15:21:19 +00:00
parent 089a246333
commit ed708f9c1f
5 changed files with 19 additions and 9 deletions
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3
include/llvm/MC/MCDwarf.h
View File

@ -263,12 +263,13 @@ namespace llvm {
struct MCDwarfFrameInfo {
MCDwarfFrameInfo() : Begin(0), End(0), Personality(0), Lsda(0),
Instructions(), PersonalityEncoding(0),
Function(0), Instructions(), PersonalityEncoding(),
LsdaEncoding(0) {}
MCSymbol *Begin;
MCSymbol *End;
const MCSymbol *Personality;
const MCSymbol *Lsda;
const MCSymbol *Function;
std::vector<MCCFIInstruction> Instructions;
unsigned PersonalityEncoding;
unsigned LsdaEncoding;

4
include/llvm/MC/MCStreamer.h
View File

@ -57,6 +57,8 @@ namespace llvm {
MCDwarfFrameInfo *getCurrentFrameInfo();
void EnsureValidFrame();
const MCSymbol* LastNonPrivate;
/// SectionStack - This is stack of current and previous section
/// values saved by PushSection.
SmallVector<std::pair<const MCSection *,
@ -180,7 +182,7 @@ namespace llvm {
/// @param Symbol - The symbol to emit. A given symbol should only be
/// emitted as a label once, and symbols emitted as a label should never be
/// used in an assignment.
virtual void EmitLabel(MCSymbol *Symbol) = 0;
virtual void EmitLabel(MCSymbol *Symbol);
/// EmitAssemblerFlag - Note in the output the specified @p Flag
virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) = 0;

4
lib/MC/MCAsmStreamer.cpp
View File

@ -278,12 +278,10 @@ void MCAsmStreamer::ChangeSection(const MCSection *Section) {
void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
assert(getCurrentSection() && "Cannot emit before setting section!");
MCStreamer::EmitLabel(Symbol);
OS << *Symbol << MAI.getLabelSuffix();
EmitEOL();
Symbol->setSection(*getCurrentSection());
}
void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {

5
lib/MC/MCObjectStreamer.cpp
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@ -107,10 +107,7 @@ void MCObjectStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
}
void MCObjectStreamer::EmitLabel(MCSymbol *Symbol) {
assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
assert(getCurrentSection() && "Cannot emit before setting section!");
Symbol->setSection(*getCurrentSection());
MCStreamer::EmitLabel(Symbol);
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);

12
lib/MC/MCStreamer.cpp
View File

@ -12,6 +12,7 @@
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/SmallString.h"
@ -153,12 +154,23 @@ void MCStreamer::EnsureValidFrame() {
report_fatal_error("No open frame");
}
void MCStreamer::EmitLabel(MCSymbol *Symbol) {
assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
assert(getCurrentSection() && "Cannot emit before setting section!");
Symbol->setSection(*getCurrentSection());
StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix();
if (!Symbol->getName().startswith(Prefix))
LastNonPrivate = Symbol;
}
void MCStreamer::EmitCFIStartProc() {
MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
if (CurFrame && !CurFrame->End)
report_fatal_error("Starting a frame before finishing the previous one!");
MCDwarfFrameInfo Frame;
Frame.Begin = getContext().CreateTempSymbol();
Frame.Function = LastNonPrivate;
EmitLabel(Frame.Begin);
FrameInfos.push_back(Frame);
}