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