ARMException.cpp revision fc2bb8c4448fa884d79e437cc2d2627a7d7740a8 
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/CodeGen/MachineLocation.h"
21#include "llvm/MC/MCAsmInfo.h"
22#include "llvm/MC/MCContext.h"
23#include "llvm/MC/MCExpr.h"
24#include "llvm/MC/MCSection.h"
25#include "llvm/MC/MCStreamer.h"
26#include "llvm/MC/MCSymbol.h"
27#include "llvm/Target/Mangler.h"
28#include "llvm/Target/TargetData.h"
29#include "llvm/Target/TargetFrameLowering.h"
30#include "llvm/Target/TargetLoweringObjectFile.h"
31#include "llvm/Target/TargetMachine.h"
32#include "llvm/Target/TargetOptions.h"
33#include "llvm/Target/TargetRegisterInfo.h"
34#include "llvm/Support/Dwarf.h"
35#include "llvm/Support/FormattedStream.h"
36#include "llvm/ADT/SmallString.h"
37#include "llvm/ADT/StringExtras.h"
38#include "llvm/ADT/Twine.h"
39using namespace llvm;
40
41ARMException::ARMException(AsmPrinter *A)
42  : DwarfException(A),
43    shouldEmitTable(false), shouldEmitMoves(false), shouldEmitTableModule(false)
44    {}
45
46ARMException::~ARMException() {}
47
48void ARMException::EndModule() {
49}
50
51/// BeginFunction - Gather pre-function exception information. Assumes it's
52/// being emitted immediately after the function entry point.
53void ARMException::BeginFunction(const MachineFunction *MF) {
54  Asm->OutStreamer.EmitFnStart();
55  if (Asm->MF->getFunction()->needsUnwindTableEntry())
56    Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
57                                                  Asm->getFunctionNumber()));
58}
59
60/// EndFunction - Gather and emit post-function exception information.
61///
62void ARMException::EndFunction() {
63  if (!Asm->MF->getFunction()->needsUnwindTableEntry())
64    Asm->OutStreamer.EmitCantUnwind();
65  else {
66    Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
67                                                  Asm->getFunctionNumber()));
68
69    // Emit references to personality.
70    if (const Function * Personality =
71        MMI->getPersonalities()[MMI->getPersonalityIndex()]) {
72      MCSymbol *PerSym = Asm->Mang->getSymbol(Personality);
73      Asm->OutStreamer.EmitSymbolAttribute(PerSym, MCSA_Global);
74      Asm->OutStreamer.EmitPersonality(PerSym);
75    }
76
77    // Map all labels and get rid of any dead landing pads.
78    MMI->TidyLandingPads();
79
80    Asm->OutStreamer.EmitHandlerData();
81
82    // Emit actual exception table
83    EmitExceptionTable();
84  }
85
86  Asm->OutStreamer.EmitFnEnd();
87}
88