mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-20 03:23:01 +02:00
95e3cfd5ed
This removes a bit of duplicated code and more importantly, remembers the labels so that they don't need to be looked up by name. This in turn allows for any name to be used and avoids a crash if the name we wanted was already taken. llvm-svn: 230772
141 lines
4.6 KiB
C++
141 lines
4.6 KiB
C++
//===-- CodeGen/AsmPrinter/DwarfException.cpp - Dwarf Exception Impl ------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file contains support for writing DWARF exception info into asm files.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "DwarfException.h"
|
|
#include "llvm/ADT/SmallString.h"
|
|
#include "llvm/ADT/StringExtras.h"
|
|
#include "llvm/ADT/Twine.h"
|
|
#include "llvm/CodeGen/AsmPrinter.h"
|
|
#include "llvm/CodeGen/MachineFrameInfo.h"
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
|
#include "llvm/CodeGen/MachineModuleInfo.h"
|
|
#include "llvm/IR/DataLayout.h"
|
|
#include "llvm/IR/Mangler.h"
|
|
#include "llvm/IR/Module.h"
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCSection.h"
|
|
#include "llvm/MC/MCStreamer.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/MC/MachineLocation.h"
|
|
#include "llvm/Support/Dwarf.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include "llvm/Support/FormattedStream.h"
|
|
#include "llvm/Target/TargetFrameLowering.h"
|
|
#include "llvm/Target/TargetLoweringObjectFile.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Target/TargetOptions.h"
|
|
#include "llvm/Target/TargetRegisterInfo.h"
|
|
using namespace llvm;
|
|
|
|
DwarfCFIException::DwarfCFIException(AsmPrinter *A)
|
|
: EHStreamer(A), shouldEmitPersonality(false), shouldEmitLSDA(false),
|
|
shouldEmitMoves(false), moveTypeModule(AsmPrinter::CFI_M_None) {}
|
|
|
|
DwarfCFIException::~DwarfCFIException() {}
|
|
|
|
/// endModule - Emit all exception information that should come after the
|
|
/// content.
|
|
void DwarfCFIException::endModule() {
|
|
if (moveTypeModule == AsmPrinter::CFI_M_Debug)
|
|
Asm->OutStreamer.EmitCFISections(false, true);
|
|
|
|
// SjLj uses this pass and it doesn't need this info.
|
|
if (!Asm->MAI->usesCFIForEH())
|
|
return;
|
|
|
|
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
|
|
|
|
unsigned PerEncoding = TLOF.getPersonalityEncoding();
|
|
|
|
if ((PerEncoding & 0x80) != dwarf::DW_EH_PE_indirect)
|
|
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) {
|
|
if (!Personalities[i])
|
|
continue;
|
|
MCSymbol *Sym = Asm->getSymbol(Personalities[i]);
|
|
TLOF.emitPersonalityValue(Asm->OutStreamer, Asm->TM, Sym);
|
|
}
|
|
}
|
|
|
|
/// beginFunction - Gather pre-function exception information. Assumes it's
|
|
/// being emitted immediately after the function entry point.
|
|
void DwarfCFIException::beginFunction(const MachineFunction *MF) {
|
|
shouldEmitMoves = shouldEmitPersonality = shouldEmitLSDA = false;
|
|
|
|
// If any landing pads survive, we need an EH table.
|
|
bool hasLandingPads = !MMI->getLandingPads().empty();
|
|
|
|
// See if we need frame move info.
|
|
AsmPrinter::CFIMoveType MoveType = Asm->needsCFIMoves();
|
|
if (MoveType == AsmPrinter::CFI_M_EH ||
|
|
(MoveType == AsmPrinter::CFI_M_Debug &&
|
|
moveTypeModule == AsmPrinter::CFI_M_None))
|
|
moveTypeModule = MoveType;
|
|
|
|
shouldEmitMoves = MoveType != AsmPrinter::CFI_M_None;
|
|
|
|
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
|
|
unsigned PerEncoding = TLOF.getPersonalityEncoding();
|
|
const Function *Per = MMI->getPersonality();
|
|
|
|
shouldEmitPersonality = hasLandingPads &&
|
|
PerEncoding != dwarf::DW_EH_PE_omit && Per;
|
|
|
|
unsigned LSDAEncoding = TLOF.getLSDAEncoding();
|
|
shouldEmitLSDA = shouldEmitPersonality &&
|
|
LSDAEncoding != dwarf::DW_EH_PE_omit;
|
|
|
|
if (!shouldEmitPersonality && !shouldEmitMoves)
|
|
return;
|
|
|
|
Asm->OutStreamer.EmitCFIStartProc(/*IsSimple=*/false);
|
|
|
|
// Indicate personality routine, if any.
|
|
if (!shouldEmitPersonality)
|
|
return;
|
|
|
|
const MCSymbol *Sym =
|
|
TLOF.getCFIPersonalitySymbol(Per, *Asm->Mang, Asm->TM, MMI);
|
|
Asm->OutStreamer.EmitCFIPersonality(Sym, PerEncoding);
|
|
|
|
// Provide LSDA information.
|
|
if (!shouldEmitLSDA)
|
|
return;
|
|
|
|
Asm->OutStreamer.EmitCFILsda(Asm->GetTempSymbol("exception",
|
|
Asm->getFunctionNumber()),
|
|
LSDAEncoding);
|
|
}
|
|
|
|
/// endFunction - Gather and emit post-function exception information.
|
|
///
|
|
void DwarfCFIException::endFunction(const MachineFunction *) {
|
|
if (!shouldEmitPersonality && !shouldEmitMoves)
|
|
return;
|
|
|
|
Asm->OutStreamer.EmitCFIEndProc();
|
|
|
|
if (!shouldEmitPersonality)
|
|
return;
|
|
|
|
// Map all labels and get rid of any dead landing pads.
|
|
MMI->TidyLandingPads();
|
|
|
|
emitExceptionTable();
|
|
}
|