lib/DebugInfo/DWARF/DWARFDebugMacro.cpp

   1 //===- DWARFDebugMacro.cpp ------------------------------------------------===//
   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 #include "llvm/DebugInfo/DWARF/DWARFDebugMacro.h"
  11 #include "llvm/BinaryFormat/Dwarf.h"
  12 #include "llvm/Support/WithColor.h"
  13 #include "llvm/Support/raw_ostream.h"
  14 #include <cstdint>
  15
  16 using namespace llvm;
  17 using namespace dwarf;
  18
  19 void DWARFDebugMacro::dump(raw_ostream &OS) const {
  20   unsigned IndLevel = 0;
  21   for (const Entry &E : Macros) {
  22     // There should not be DW_MACINFO_end_file when IndLevel is Zero. However,
  23     // this check handles the case of corrupted ".debug_macinfo" section.
  24     if (IndLevel > 0)
  25       IndLevel -= (E.Type == DW_MACINFO_end_file);
  26     // Print indentation.
  27     for (unsigned I = 0; I < IndLevel; I++)
  28       OS << "  ";
  29     IndLevel += (E.Type == DW_MACINFO_start_file);
  30
  31     WithColor(OS, HighlightColor::Macro).get() << MacinfoString(E.Type);
  32     switch (E.Type) {
  33     default:
  34       // Got a corrupted ".debug_macinfo" section (invalid macinfo type).
  35       break;
  36     case DW_MACINFO_define:
  37     case DW_MACINFO_undef:
  38       OS << " - lineno: " << E.Line;
  39       OS << " macro: " << E.MacroStr;
  40       break;
  41     case DW_MACINFO_start_file:
  42       OS << " - lineno: " << E.Line;
  43       OS << " filenum: " << E.File;
  44       break;
  45     case DW_MACINFO_end_file:
  46       break;
  47     case DW_MACINFO_vendor_ext:
  48       OS << " - constant: " << E.ExtConstant;
  49       OS << " string: " << E.ExtStr;
  50       break;
  51     }
  52     OS << "\n";
  53   }
  54 }
  55
  56 void DWARFDebugMacro::parse(DataExtractor data) {
  57   uint32_t Offset = 0;
  58   while (data.isValidOffset(Offset)) {
  59     // A macro list entry consists of:
  60     Entry E;
  61     // 1. Macinfo type
  62     E.Type = data.getULEB128(&Offset);
  63
  64     if (E.Type == 0) {
  65       // Reached end of ".debug_macinfo" section.
  66       return;
  67     }
  68
  69     switch (E.Type) {
  70     default:
  71       // Got a corrupted ".debug_macinfo" section (invalid macinfo type).
  72       // Push the corrupted entry to the list and halt parsing.
  73       E.Type = DW_MACINFO_invalid;
  74       Macros.push_back(E);
  75       return;
  76     case DW_MACINFO_define:
  77     case DW_MACINFO_undef:
  78       // 2. Source line
  79       E.Line = data.getULEB128(&Offset);
  80       // 3. Macro string
  81       E.MacroStr = data.getCStr(&Offset);
  82       break;
  83     case DW_MACINFO_start_file:
  84       // 2. Source line
  85       E.Line = data.getULEB128(&Offset);
  86       // 3. Source file id
  87       E.File = data.getULEB128(&Offset);
  88       break;
  89     case DW_MACINFO_end_file:
  90       break;
  91     case DW_MACINFO_vendor_ext:
  92       // 2. Vendor extension constant
  93       E.ExtConstant = data.getULEB128(&Offset);
  94       // 3. Vendor extension string
  95       E.ExtStr = data.getCStr(&Offset);
  96       break;
  97     }
  98
  99     Macros.push_back(E);
 100   }
 101 }