1 //===-- CodeGen/AsmPrinter/ARMException.cpp - ARM EHABI Exception Impl ----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains support for writing DWARF exception info into asm files.
12 //===----------------------------------------------------------------------===//
14 #include "DwarfException.h"
15 #include "llvm/ADT/SmallString.h"
16 #include "llvm/ADT/StringExtras.h"
17 #include "llvm/ADT/Twine.h"
18 #include "llvm/CodeGen/AsmPrinter.h"
19 #include "llvm/CodeGen/MachineFrameInfo.h"
20 #include "llvm/CodeGen/MachineFunction.h"
21 #include "llvm/CodeGen/MachineModuleInfo.h"
22 #include "llvm/IR/DataLayout.h"
23 #include "llvm/IR/Mangler.h"
24 #include "llvm/IR/Module.h"
25 #include "llvm/MC/MCAsmInfo.h"
26 #include "llvm/MC/MCContext.h"
27 #include "llvm/MC/MCExpr.h"
28 #include "llvm/MC/MCSection.h"
29 #include "llvm/MC/MCStreamer.h"
30 #include "llvm/MC/MCSymbol.h"
31 #include "llvm/Support/CommandLine.h"
32 #include "llvm/Support/Dwarf.h"
33 #include "llvm/Support/FormattedStream.h"
34 #include "llvm/Target/TargetFrameLowering.h"
35 #include "llvm/Target/TargetOptions.h"
36 #include "llvm/Target/TargetRegisterInfo.h"
39 ARMException::ARMException(AsmPrinter *A) : DwarfCFIExceptionBase(A) {}
41 ARMException::~ARMException() {}
43 ARMTargetStreamer &ARMException::getTargetStreamer() {
44 MCTargetStreamer &TS = *Asm->OutStreamer.getTargetStreamer();
45 return static_cast<ARMTargetStreamer &>(TS);
48 /// endModule - Emit all exception information that should come after the
50 void ARMException::endModule() {
52 Asm->OutStreamer.EmitCFISections(false, true);
55 /// beginFunction - Gather pre-function exception information. Assumes it's
56 /// being emitted immediately after the function entry point.
57 void ARMException::beginFunction(const MachineFunction *MF) {
58 if (Asm->MAI->getExceptionHandlingType() == ExceptionHandling::ARM)
59 getTargetStreamer().emitFnStart();
60 // See if we need call frame info.
61 AsmPrinter::CFIMoveType MoveType = Asm->needsCFIMoves();
62 assert(MoveType != AsmPrinter::CFI_M_EH &&
63 "non-EH CFI not yet supported in prologue with EHABI lowering");
64 if (MoveType == AsmPrinter::CFI_M_Debug) {
66 Asm->OutStreamer.EmitCFIStartProc(false);
70 /// endFunction - Gather and emit post-function exception information.
72 void ARMException::endFunction(const MachineFunction *MF) {
73 ARMTargetStreamer &ATS = getTargetStreamer();
74 if (!Asm->MF->getFunction()->needsUnwindTableEntry() &&
75 MMI->getLandingPads().empty())
78 if (!MMI->getLandingPads().empty()) {
79 // Emit references to personality.
80 if (const Function *Personality = MMI->getPersonality()) {
81 MCSymbol *PerSym = Asm->getSymbol(Personality);
82 Asm->OutStreamer.EmitSymbolAttribute(PerSym, MCSA_Global);
83 ATS.emitPersonality(PerSym);
86 // Emit .handlerdata directive.
87 ATS.emitHandlerData();
89 // Emit actual exception table
94 if (Asm->MAI->getExceptionHandlingType() == ExceptionHandling::ARM)
98 void ARMException::emitTypeInfos(unsigned TTypeEncoding) {
99 const std::vector<const GlobalValue *> &TypeInfos = MMI->getTypeInfos();
100 const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
102 bool VerboseAsm = Asm->OutStreamer.isVerboseAsm();
105 // Emit the Catch TypeInfos.
106 if (VerboseAsm && !TypeInfos.empty()) {
107 Asm->OutStreamer.AddComment(">> Catch TypeInfos <<");
108 Asm->OutStreamer.AddBlankLine();
109 Entry = TypeInfos.size();
112 for (std::vector<const GlobalValue *>::const_reverse_iterator
113 I = TypeInfos.rbegin(), E = TypeInfos.rend(); I != E; ++I) {
114 const GlobalValue *GV = *I;
116 Asm->OutStreamer.AddComment("TypeInfo " + Twine(Entry--));
117 Asm->EmitTTypeReference(GV, TTypeEncoding);
120 // Emit the Exception Specifications.
121 if (VerboseAsm && !FilterIds.empty()) {
122 Asm->OutStreamer.AddComment(">> Filter TypeInfos <<");
123 Asm->OutStreamer.AddBlankLine();
126 for (std::vector<unsigned>::const_iterator
127 I = FilterIds.begin(), E = FilterIds.end(); I < E; ++I) {
128 unsigned TypeID = *I;
132 Asm->OutStreamer.AddComment("FilterInfo " + Twine(Entry));
135 Asm->EmitTTypeReference((TypeID == 0 ? nullptr : TypeInfos[TypeID - 1]),