136 lines
4.4 KiB
C++
136 lines
4.4 KiB
C++
//===-- CodeGen/AsmPrinter/ARMException.cpp - ARM EHABI Exception Impl ----===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file contains support for writing DWARF exception info into asm files.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "DwarfException.h"
|
|
#include "llvm/ADT/Twine.h"
|
|
#include "llvm/CodeGen/AsmPrinter.h"
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
|
#include "llvm/IR/DataLayout.h"
|
|
#include "llvm/IR/Mangler.h"
|
|
#include "llvm/IR/Module.h"
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCSection.h"
|
|
#include "llvm/MC/MCStreamer.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/Support/FormattedStream.h"
|
|
#include "llvm/Target/TargetOptions.h"
|
|
using namespace llvm;
|
|
|
|
ARMException::ARMException(AsmPrinter *A) : DwarfCFIExceptionBase(A) {}
|
|
|
|
ARMException::~ARMException() {}
|
|
|
|
ARMTargetStreamer &ARMException::getTargetStreamer() {
|
|
MCTargetStreamer &TS = *Asm->OutStreamer->getTargetStreamer();
|
|
return static_cast<ARMTargetStreamer &>(TS);
|
|
}
|
|
|
|
void ARMException::beginFunction(const MachineFunction *MF) {
|
|
if (Asm->MAI->getExceptionHandlingType() == ExceptionHandling::ARM)
|
|
getTargetStreamer().emitFnStart();
|
|
// See if we need call frame info.
|
|
AsmPrinter::CFIMoveType MoveType = Asm->needsCFIMoves();
|
|
assert(MoveType != AsmPrinter::CFI_M_EH &&
|
|
"non-EH CFI not yet supported in prologue with EHABI lowering");
|
|
|
|
if (MoveType == AsmPrinter::CFI_M_Debug) {
|
|
if (!hasEmittedCFISections) {
|
|
if (Asm->needsOnlyDebugCFIMoves())
|
|
Asm->OutStreamer->emitCFISections(false, true);
|
|
hasEmittedCFISections = true;
|
|
}
|
|
|
|
shouldEmitCFI = true;
|
|
Asm->OutStreamer->emitCFIStartProc(false);
|
|
}
|
|
}
|
|
|
|
/// endFunction - Gather and emit post-function exception information.
|
|
///
|
|
void ARMException::endFunction(const MachineFunction *MF) {
|
|
ARMTargetStreamer &ATS = getTargetStreamer();
|
|
const Function &F = MF->getFunction();
|
|
const Function *Per = nullptr;
|
|
if (F.hasPersonalityFn())
|
|
Per = dyn_cast<Function>(F.getPersonalityFn()->stripPointerCasts());
|
|
bool forceEmitPersonality =
|
|
F.hasPersonalityFn() && !isNoOpWithoutInvoke(classifyEHPersonality(Per)) &&
|
|
F.needsUnwindTableEntry();
|
|
bool shouldEmitPersonality = forceEmitPersonality ||
|
|
!MF->getLandingPads().empty();
|
|
if (!Asm->MF->getFunction().needsUnwindTableEntry() &&
|
|
!shouldEmitPersonality)
|
|
ATS.emitCantUnwind();
|
|
else if (shouldEmitPersonality) {
|
|
// Emit references to personality.
|
|
if (Per) {
|
|
MCSymbol *PerSym = Asm->getSymbol(Per);
|
|
Asm->OutStreamer->emitSymbolAttribute(PerSym, MCSA_Global);
|
|
ATS.emitPersonality(PerSym);
|
|
}
|
|
|
|
// Emit .handlerdata directive.
|
|
ATS.emitHandlerData();
|
|
|
|
// Emit actual exception table
|
|
emitExceptionTable();
|
|
}
|
|
|
|
if (Asm->MAI->getExceptionHandlingType() == ExceptionHandling::ARM)
|
|
ATS.emitFnEnd();
|
|
}
|
|
|
|
void ARMException::emitTypeInfos(unsigned TTypeEncoding,
|
|
MCSymbol *TTBaseLabel) {
|
|
const MachineFunction *MF = Asm->MF;
|
|
const std::vector<const GlobalValue *> &TypeInfos = MF->getTypeInfos();
|
|
const std::vector<unsigned> &FilterIds = MF->getFilterIds();
|
|
|
|
bool VerboseAsm = Asm->OutStreamer->isVerboseAsm();
|
|
|
|
int Entry = 0;
|
|
// Emit the Catch TypeInfos.
|
|
if (VerboseAsm && !TypeInfos.empty()) {
|
|
Asm->OutStreamer->AddComment(">> Catch TypeInfos <<");
|
|
Asm->OutStreamer->AddBlankLine();
|
|
Entry = TypeInfos.size();
|
|
}
|
|
|
|
for (const GlobalValue *GV : reverse(TypeInfos)) {
|
|
if (VerboseAsm)
|
|
Asm->OutStreamer->AddComment("TypeInfo " + Twine(Entry--));
|
|
Asm->emitTTypeReference(GV, TTypeEncoding);
|
|
}
|
|
|
|
Asm->OutStreamer->emitLabel(TTBaseLabel);
|
|
|
|
// Emit the Exception Specifications.
|
|
if (VerboseAsm && !FilterIds.empty()) {
|
|
Asm->OutStreamer->AddComment(">> Filter TypeInfos <<");
|
|
Asm->OutStreamer->AddBlankLine();
|
|
Entry = 0;
|
|
}
|
|
for (std::vector<unsigned>::const_iterator
|
|
I = FilterIds.begin(), E = FilterIds.end(); I < E; ++I) {
|
|
unsigned TypeID = *I;
|
|
if (VerboseAsm) {
|
|
--Entry;
|
|
if (TypeID != 0)
|
|
Asm->OutStreamer->AddComment("FilterInfo " + Twine(Entry));
|
|
}
|
|
|
|
Asm->emitTTypeReference((TypeID == 0 ? nullptr : TypeInfos[TypeID - 1]),
|
|
TTypeEncoding);
|
|
}
|
|
}
|