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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/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/Mangler.h"
#include "llvm/Target/TargetFrameLowering.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegisterInfo.h"
using namespace llvm;
cl::opt<bool>
EnableARMEHABIDescriptors("arm-enable-ehabi-descriptors", cl::Hidden,
cl::desc("Generate ARM EHABI tables with unwinding descriptors"),
cl::init(false));
ARMException::ARMException(AsmPrinter *A)
: DwarfException(A) {}
ARMException::~ARMException() {}
void ARMException::EndModule() {
}
/// BeginFunction - Gather pre-function exception information. Assumes it's
/// being emitted immediately after the function entry point.
void ARMException::BeginFunction(const MachineFunction *MF) {
Asm->OutStreamer.EmitFnStart();
if (Asm->MF->getFunction()->needsUnwindTableEntry())
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
Asm->getFunctionNumber()));
}
/// EndFunction - Gather and emit post-function exception information.
///
void ARMException::EndFunction() {
if (!Asm->MF->getFunction()->needsUnwindTableEntry())
Asm->OutStreamer.EmitCantUnwind();
else {
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
Asm->getFunctionNumber()));
if (EnableARMEHABIDescriptors) {
// Map all labels and get rid of any dead landing pads.
MMI->TidyLandingPads();
if (!MMI->getLandingPads().empty()) {
// Emit references to personality.
if (const Function * Personality =
MMI->getPersonalities()[MMI->getPersonalityIndex()]) {
MCSymbol *PerSym = Asm->Mang->getSymbol(Personality);
Asm->OutStreamer.EmitSymbolAttribute(PerSym, MCSA_Global);
Asm->OutStreamer.EmitPersonality(PerSym);
}
// Emit .handlerdata directive.
Asm->OutStreamer.EmitHandlerData();
// Emit actual exception table
EmitExceptionTable();
}
}
}
Asm->OutStreamer.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 ? 0 : TypeInfos[TypeID - 1]),
TTypeEncoding);
}
}
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