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Change ELF systems to use CFI for producing the EH tables. This reduces the

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size of the clang binary in Debug builds from 690MB to 679MB.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129518 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2011-04-14 15:18:53 +00:00
parent 9a0bac41b3
commit 3dae6e7333
9 changed files with 91 additions and 33 deletions
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42
lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
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@ -32,6 +32,7 @@
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
@ -60,11 +61,16 @@ void DwarfCFIException::EndModule() {
// Begin eh frame section.
Asm->OutStreamer.SwitchSection(TLOF.getEHFrameSection());
if ((PerEncoding & 0x70) != dwarf::DW_EH_PE_pcrel)
return;
// Emit references to all used personality functions
const std::vector<const Function*> &Personalities = MMI->getPersonalities();
for (size_t i = 0, e = Personalities.size(); i != e; ++i) {
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("personality", i));
Asm->EmitReference(Personalities[i], PerEncoding);
const MCSymbol *Sym = Asm->Mang->getSymbol(Personalities[i]);
unsigned Size = Asm->TM.getTargetData()->getPointerSize();
Asm->OutStreamer.EmitSymbolValue(Sym, Size);
}
}
@ -87,17 +93,9 @@ void DwarfCFIException::BeginFunction(const MachineFunction *MF) {
shouldEmitTableModule |= shouldEmitTable;
if (shouldEmitMoves) {
const TargetFrameLowering *TFL = Asm->TM.getFrameLowering();
if (shouldEmitMoves || shouldEmitTable)
Asm->OutStreamer.EmitCFIStartProc();
// Indicate locations of general callee saved registers in frame.
std::vector<MachineMove> Moves;
TFL->getInitialFrameState(Moves);
Asm->EmitCFIFrameMoves(Moves);
Asm->EmitCFIFrameMoves(MMI->getFrameMoves());
}
if (!shouldEmitTable)
return;
@ -112,11 +110,25 @@ void DwarfCFIException::BeginFunction(const MachineFunction *MF) {
// Indicate personality routine, if any.
unsigned PerEncoding = TLOF.getPersonalityEncoding();
if (PerEncoding != dwarf::DW_EH_PE_omit &&
MMI->getPersonalities()[MMI->getPersonalityIndex()])
Asm->OutStreamer.EmitCFIPersonality(Asm->GetTempSymbol("personality",
MMI->getPersonalityIndex()),
PerEncoding);
const Function *Per = MMI->getPersonalities()[MMI->getPersonalityIndex()];
if (PerEncoding == dwarf::DW_EH_PE_omit || !Per)
return;
const MCSymbol *Sym;
switch (PerEncoding & 0x70) {
default:
report_fatal_error("We do not support this DWARF encoding yet!");
case dwarf::DW_EH_PE_absptr: {
Sym = Asm->Mang->getSymbol(Per);
break;
}
case dwarf::DW_EH_PE_pcrel: {
Sym = Asm->GetTempSymbol("personality",
MMI->getPersonalityIndex());
break;
}
}
Asm->OutStreamer.EmitCFIPersonality(Sym, PerEncoding);
}
/// EndFunction - Gather and emit post-function exception information.