mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-26 14:33:02 +02:00
143 lines
4.8 KiB
C++
143 lines
4.8 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/Module.h"
|
|
#include "llvm/CodeGen/AsmPrinter.h"
|
|
#include "llvm/CodeGen/MachineModuleInfo.h"
|
|
#include "llvm/CodeGen/MachineFrameInfo.h"
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
|
#include "llvm/CodeGen/MachineLocation.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/Target/Mangler.h"
|
|
#include "llvm/Target/TargetData.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"
|
|
#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"
|
|
#include "llvm/ADT/Twine.h"
|
|
using namespace llvm;
|
|
|
|
DwarfCFIException::DwarfCFIException(AsmPrinter *A)
|
|
: DwarfException(A),
|
|
shouldEmitTable(false), shouldEmitMoves(false), shouldEmitTableModule(false)
|
|
{}
|
|
|
|
DwarfCFIException::~DwarfCFIException() {}
|
|
|
|
/// EndModule - Emit all exception information that should come after the
|
|
/// content.
|
|
void DwarfCFIException::EndModule() {
|
|
if (!Asm->MAI->isExceptionHandlingDwarf())
|
|
return;
|
|
|
|
if (!shouldEmitTableModule)
|
|
return;
|
|
|
|
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
|
|
unsigned PerEncoding = TLOF.getPersonalityEncoding();
|
|
|
|
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) {
|
|
const MCSymbol *Sym = Asm->Mang->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) {
|
|
shouldEmitTable = shouldEmitMoves = false;
|
|
|
|
// If any landing pads survive, we need an EH table.
|
|
shouldEmitTable = !MMI->getLandingPads().empty();
|
|
|
|
// See if we need frame move info.
|
|
shouldEmitMoves = MMI->hasDebugInfo() ||
|
|
!Asm->MF->getFunction()->doesNotThrow() || UnwindTablesMandatory;
|
|
|
|
if (shouldEmitMoves || shouldEmitTable)
|
|
// Assumes in correct section after the entry point.
|
|
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
|
|
Asm->getFunctionNumber()));
|
|
|
|
shouldEmitTableModule |= shouldEmitTable;
|
|
|
|
if (shouldEmitMoves || shouldEmitTable)
|
|
Asm->OutStreamer.EmitCFIStartProc();
|
|
|
|
if (!shouldEmitTable)
|
|
return;
|
|
|
|
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
|
|
|
|
// Provide LSDA information.
|
|
unsigned LSDAEncoding = TLOF.getLSDAEncoding();
|
|
if (LSDAEncoding != dwarf::DW_EH_PE_omit)
|
|
Asm->OutStreamer.EmitCFILsda(Asm->GetTempSymbol("exception",
|
|
Asm->getFunctionNumber()),
|
|
LSDAEncoding);
|
|
|
|
// Indicate personality routine, if any.
|
|
unsigned PerEncoding = TLOF.getPersonalityEncoding();
|
|
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 = TLOF.getPersonalityPICSymbol(Per->getName());
|
|
break;
|
|
}
|
|
Asm->OutStreamer.EmitCFIPersonality(Sym, PerEncoding);
|
|
}
|
|
|
|
/// EndFunction - Gather and emit post-function exception information.
|
|
///
|
|
void DwarfCFIException::EndFunction() {
|
|
if (!shouldEmitMoves && !shouldEmitTable) return;
|
|
|
|
if (shouldEmitMoves || shouldEmitTable)
|
|
Asm->OutStreamer.EmitCFIEndProc();
|
|
|
|
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
|
|
Asm->getFunctionNumber()));
|
|
|
|
// Map all labels and get rid of any dead landing pads.
|
|
MMI->TidyLandingPads();
|
|
|
|
if (shouldEmitTable)
|
|
EmitExceptionTable();
|
|
}
|