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//===-- CodeGen/AsmPrinter/ARMException.cpp - ARM EHABI 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/Support/CommandLine.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Target/TargetFrameLowering.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegisterInfo.h"
using namespace llvm;
ARMException::ARMException(AsmPrinter *A)
: EHStreamer(A), shouldEmitCFI(false) {}
ARMException::~ARMException() {}
ARMTargetStreamer &ARMException::getTargetStreamer() {
MCTargetStreamer &TS = *Asm->OutStreamer.getTargetStreamer();
return static_cast<ARMTargetStreamer &>(TS);
}
/// endModule - Emit all exception information that should come after the
/// content.
void ARMException::endModule() {
if (shouldEmitCFI)
Asm->OutStreamer.EmitCFISections(false, true);
}
/// beginFunction - Gather pre-function exception information. Assumes it's
/// being emitted immediately after the function entry point.
void ARMException::beginFunction(const MachineFunction *MF) {
if (Asm->MAI->getExceptionHandlingType() == ExceptionHandling::ARM)
getTargetStreamer().emitFnStart();
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
Asm->getFunctionNumber()));
// 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) {
shouldEmitCFI = true;
Asm->OutStreamer.EmitCFIStartProc(false);
}
}
/// endFunction - Gather and emit post-function exception information.
///
void ARMException::endFunction(const MachineFunction *) {
if (shouldEmitCFI)
Asm->OutStreamer.EmitCFIEndProc();
// Map all labels and get rid of any dead landing pads.
MMI->TidyLandingPads();
ARMTargetStreamer &ATS = getTargetStreamer();
if (!Asm->MF->getFunction()->needsUnwindTableEntry() &&
MMI->getLandingPads().empty())
ATS.emitCantUnwind();
else {
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
Asm->getFunctionNumber()));
if (!MMI->getLandingPads().empty()) {
// Emit references to personality.
if (const Function * Personality =
MMI->getPersonalities()[MMI->getPersonalityIndex()]) {
MCSymbol *PerSym = Asm->getSymbol(Personality);
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) {
const std::vector<const GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
const std::vector<unsigned> &FilterIds = MMI->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 (std::vector<const GlobalVariable *>::const_reverse_iterator
I = TypeInfos.rbegin(), E = TypeInfos.rend(); I != E; ++I) {
const GlobalVariable *GV = *I;
if (VerboseAsm)
Asm->OutStreamer.AddComment("TypeInfo " + Twine(Entry--));
Asm->EmitTTypeReference(GV, TTypeEncoding);
}
// 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);
}
}
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