ARMException.cpp revision 2d28617de2b0b731c08d1af9e830f31e14ac75b4 
1//===-- CodeGen/AsmPrinter/ARMException.cpp - ARM EHABI Exception Impl ----===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file contains support for writing DWARF exception info into asm files.
11//
12//===----------------------------------------------------------------------===//
13
14#include "DwarfException.h"
15#include "llvm/Module.h"
16#include "llvm/CodeGen/AsmPrinter.h"
17#include "llvm/CodeGen/MachineModuleInfo.h"
18#include "llvm/CodeGen/MachineFrameInfo.h"
19#include "llvm/CodeGen/MachineFunction.h"
20#include "llvm/MC/MCAsmInfo.h"
21#include "llvm/MC/MCContext.h"
22#include "llvm/MC/MCExpr.h"
23#include "llvm/MC/MCSection.h"
24#include "llvm/MC/MCStreamer.h"
25#include "llvm/MC/MCSymbol.h"
26#include "llvm/Target/Mangler.h"
27#include "llvm/Target/TargetData.h"
28#include "llvm/Target/TargetFrameLowering.h"
29#include "llvm/Target/TargetLoweringObjectFile.h"
30#include "llvm/Target/TargetMachine.h"
31#include "llvm/Target/TargetOptions.h"
32#include "llvm/Target/TargetRegisterInfo.h"
33#include "llvm/Support/Dwarf.h"
34#include "llvm/Support/FormattedStream.h"
35#include "llvm/ADT/SmallString.h"
36#include "llvm/ADT/StringExtras.h"
37#include "llvm/ADT/Twine.h"
38using namespace llvm;
39
40ARMException::ARMException(AsmPrinter *A)
41  : DwarfException(A),
42    shouldEmitTable(false), shouldEmitMoves(false), shouldEmitTableModule(false)
43    {}
44
45ARMException::~ARMException() {}
46
47void ARMException::EndModule() {
48}
49
50/// BeginFunction - Gather pre-function exception information. Assumes it's
51/// being emitted immediately after the function entry point.
52void ARMException::BeginFunction(const MachineFunction *MF) {
53  Asm->OutStreamer.EmitFnStart();
54  if (Asm->MF->getFunction()->needsUnwindTableEntry())
55    Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
56                                                  Asm->getFunctionNumber()));
57}
58
59/// EndFunction - Gather and emit post-function exception information.
60///
61void ARMException::EndFunction() {
62  if (!Asm->MF->getFunction()->needsUnwindTableEntry())
63    Asm->OutStreamer.EmitCantUnwind();
64  else {
65    Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
66                                                  Asm->getFunctionNumber()));
67
68    // Emit references to personality.
69    if (const Function * Personality =
70        MMI->getPersonalities()[MMI->getPersonalityIndex()]) {
71      MCSymbol *PerSym = Asm->Mang->getSymbol(Personality);
72      Asm->OutStreamer.EmitSymbolAttribute(PerSym, MCSA_Global);
73      Asm->OutStreamer.EmitPersonality(PerSym);
74    }
75
76    // Map all labels and get rid of any dead landing pads.
77    MMI->TidyLandingPads();
78
79    Asm->OutStreamer.EmitHandlerData();
80
81    // Emit actual exception table
82    EmitExceptionTable();
83  }
84
85  Asm->OutStreamer.EmitFnEnd();
86}
87