lib/CodeGen/AsmPrinter/DwarfWriter.cpp

   1 //===-- llvm/CodeGen/DwarfWriter.cpp - Dwarf Framework --------------------===//
   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 info into asm files.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/CodeGen/DwarfWriter.h"
  15 #include "DwarfDebug.h"
  16 #include "DwarfException.h"
  17 #include "llvm/CodeGen/MachineModuleInfo.h"
  18
  19 using namespace llvm;
  20
  21 static RegisterPass<DwarfWriter>
  22 X("dwarfwriter", "DWARF Information Writer");
  23 char DwarfWriter::ID = 0;
  24
  25 //===----------------------------------------------------------------------===//
  26 /// DwarfWriter Implementation
  27 ///
  28
  29 DwarfWriter::DwarfWriter()
  30   : ImmutablePass(&ID), DD(0), DE(0) {}
  31
  32 DwarfWriter::~DwarfWriter() {
  33   delete DE;
  34   delete DD;
  35 }
  36
  37 /// BeginModule - Emit all Dwarf sections that should come prior to the
  38 /// content.
  39 void DwarfWriter::BeginModule(Module *M,
  40                               MachineModuleInfo *MMI,
  41                               raw_ostream &OS, AsmPrinter *A,
  42                               const MCAsmInfo *T) {
  43   DE = new DwarfException(OS, A, T);
  44   DD = new DwarfDebug(OS, A, T);
  45   DE->BeginModule(M, MMI);
  46   DD->BeginModule(M, MMI);
  47 }
  48
  49 /// EndModule - Emit all Dwarf sections that should come after the content.
  50 ///
  51 void DwarfWriter::EndModule() {
  52   DE->EndModule();
  53   DD->EndModule();
  54 }
  55
  56 /// BeginFunction - Gather pre-function debug information.  Assumes being
  57 /// emitted immediately after the function entry point.
  58 void DwarfWriter::BeginFunction(MachineFunction *MF) {
  59   DE->BeginFunction(MF);
  60   DD->BeginFunction(MF);
  61 }
  62
  63 /// EndFunction - Gather and emit post-function debug information.
  64 ///
  65 void DwarfWriter::EndFunction(MachineFunction *MF) {
  66   DD->EndFunction(MF);
  67   DE->EndFunction();
  68
  69   if (MachineModuleInfo *MMI = DD->getMMI() ? DD->getMMI() : DE->getMMI())
  70     // Clear function debug information.
  71     MMI->EndFunction();
  72 }
  73
  74 /// RecordSourceLine - Records location information and associates it with a
  75 /// label. Returns a unique label ID used to generate a label and provide
  76 /// correspondence to the source line list.
  77 unsigned DwarfWriter::RecordSourceLine(unsigned Line, unsigned Col,
  78                                        DICompileUnit CU) {
  79   return DD->RecordSourceLine(Line, Col, CU);
  80 }
  81
  82 /// RecordRegionStart - Indicate the start of a region.
  83 unsigned DwarfWriter::RecordRegionStart(MDNode *N) {
  84   return DD->RecordRegionStart(N);
  85 }
  86
  87 /// RecordRegionEnd - Indicate the end of a region.
  88 unsigned DwarfWriter::RecordRegionEnd(MDNode *N) {
  89   return DD->RecordRegionEnd(N);
  90 }
  91
  92 /// getRecordSourceLineCount - Count source lines.
  93 unsigned DwarfWriter::getRecordSourceLineCount() {
  94   return DD->getRecordSourceLineCount();
  95 }
  96
  97 /// RecordVariable - Indicate the declaration of  a local variable.
  98 ///
  99 void DwarfWriter::RecordVariable(MDNode *N, unsigned FrameIndex) {
 100   DD->RecordVariable(N, FrameIndex);
 101 }
 102
 103 /// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
 104 /// be emitted.
 105 bool DwarfWriter::ShouldEmitDwarfDebug() const {
 106   return DD && DD->ShouldEmitDwarfDebug();
 107 }
 108
 109 //// RecordInlinedFnStart
 110 unsigned DwarfWriter::RecordInlinedFnStart(DISubprogram SP, DICompileUnit CU,
 111                                            unsigned Line, unsigned Col) {
 112   return DD->RecordInlinedFnStart(SP, CU, Line, Col);
 113 }
 114
 115 /// RecordInlinedFnEnd - Indicate the end of inlined subroutine.
 116 unsigned DwarfWriter::RecordInlinedFnEnd(DISubprogram SP) {
 117   return DD->RecordInlinedFnEnd(SP);
 118 }
 119