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   delete DD; DD = 0;
  55   delete DE; DE = 0;
  56 }
  57
  58 /// BeginFunction - Gather pre-function debug information.  Assumes being
  59 /// emitted immediately after the function entry point.
  60 void DwarfWriter::BeginFunction(MachineFunction *MF) {
  61   DE->BeginFunction(MF);
  62   DD->BeginFunction(MF);
  63 }
  64
  65 /// EndFunction - Gather and emit post-function debug information.
  66 ///
  67 void DwarfWriter::EndFunction(MachineFunction *MF) {
  68   DD->EndFunction(MF);
  69   DE->EndFunction();
  70
  71   if (MachineModuleInfo *MMI = DD->getMMI() ? DD->getMMI() : DE->getMMI())
  72     // Clear function debug information.
  73     MMI->EndFunction();
  74 }
  75
  76 /// RecordSourceLine - Records location information and associates it with a
  77 /// label. Returns a unique label ID used to generate a label and provide
  78 /// correspondence to the source line list.
  79 unsigned DwarfWriter::RecordSourceLine(unsigned Line, unsigned Col,
  80                                        DICompileUnit CU) {
  81   return DD->RecordSourceLine(Line, Col, CU);
  82 }
  83
  84 /// RecordRegionStart - Indicate the start of a region.
  85 unsigned DwarfWriter::RecordRegionStart(MDNode *N) {
  86   return DD->RecordRegionStart(N);
  87 }
  88
  89 /// RecordRegionEnd - Indicate the end of a region.
  90 unsigned DwarfWriter::RecordRegionEnd(MDNode *N) {
  91   return DD->RecordRegionEnd(N);
  92 }
  93
  94 /// getRecordSourceLineCount - Count source lines.
  95 unsigned DwarfWriter::getRecordSourceLineCount() {
  96   return DD->getRecordSourceLineCount();
  97 }
  98
  99 /// RecordVariable - Indicate the declaration of  a local variable.
 100 ///
 101 void DwarfWriter::RecordVariable(MDNode *N, unsigned FrameIndex) {
 102   DD->RecordVariable(N, FrameIndex);
 103 }
 104
 105 /// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
 106 /// be emitted.
 107 bool DwarfWriter::ShouldEmitDwarfDebug() const {
 108   return DD && DD->ShouldEmitDwarfDebug();
 109 }
 110
 111 //// RecordInlinedFnStart
 112 unsigned DwarfWriter::RecordInlinedFnStart(DISubprogram SP, DICompileUnit CU,
 113                                            unsigned Line, unsigned Col) {
 114   return DD->RecordInlinedFnStart(SP, CU, Line, Col);
 115 }
 116
 117 /// RecordInlinedFnEnd - Indicate the end of inlined subroutine.
 118 unsigned DwarfWriter::RecordInlinedFnEnd(DISubprogram SP) {
 119   return DD->RecordInlinedFnEnd(SP);
 120 }
 121