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MFC r234353:
[FreeBSD/stable/9.git] / contrib / llvm / lib / CodeGen / AsmPrinter / ARMException.cpp
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/CommandLine.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"
38 using namespace llvm;
39
40 cl::opt<bool>
41 EnableARMEHABIDescriptors("arm-enable-ehabi-descriptors", cl::Hidden,
42   cl::desc("Generate ARM EHABI tables with unwinding descriptors"),
43   cl::init(false));
44
45
46 ARMException::ARMException(AsmPrinter *A)
47   : DwarfException(A),
48     shouldEmitTable(false), shouldEmitMoves(false), shouldEmitTableModule(false)
49     {}
50
51 ARMException::~ARMException() {}
52
53 void ARMException::EndModule() {
54 }
55
56 /// BeginFunction - Gather pre-function exception information. Assumes it's
57 /// being emitted immediately after the function entry point.
58 void ARMException::BeginFunction(const MachineFunction *MF) {
59   Asm->OutStreamer.EmitFnStart();
60   if (Asm->MF->getFunction()->needsUnwindTableEntry())
61     Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
62                                                   Asm->getFunctionNumber()));
63 }
64
65 /// EndFunction - Gather and emit post-function exception information.
66 ///
67 void ARMException::EndFunction() {
68   if (!Asm->MF->getFunction()->needsUnwindTableEntry())
69     Asm->OutStreamer.EmitCantUnwind();
70   else {
71     Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
72                                                   Asm->getFunctionNumber()));
73
74     // Emit references to personality.
75     if (const Function * Personality =
76         MMI->getPersonalities()[MMI->getPersonalityIndex()]) {
77       MCSymbol *PerSym = Asm->Mang->getSymbol(Personality);
78       Asm->OutStreamer.EmitSymbolAttribute(PerSym, MCSA_Global);
79       Asm->OutStreamer.EmitPersonality(PerSym);
80     }
81
82     if (EnableARMEHABIDescriptors) {
83       // Map all labels and get rid of any dead landing pads.
84       MMI->TidyLandingPads();
85
86       Asm->OutStreamer.EmitHandlerData();
87
88       // Emit actual exception table
89       EmitExceptionTable();
90     }
91   }
92
93   Asm->OutStreamer.EmitFnEnd();
94 }