1 //===-- DWARFDebugLine.h ----------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_DEBUGINFO_DWARFDEBUGLINE_H
11 #define LLVM_DEBUGINFO_DWARFDEBUGLINE_H
13 #include "llvm/Support/DataExtractor.h"
21 class DWARFDebugLine {
23 struct FileNameEntry {
24 FileNameEntry() : Name(0), DirIdx(0), ModTime(0), Length(0) {}
34 : TotalLength(0), Version(0), PrologueLength(0), MinInstLength(0),
35 DefaultIsStmt(0), LineBase(0), LineRange(0), OpcodeBase(0) {}
37 // The size in bytes of the statement information for this compilation unit
38 // (not including the total_length field itself).
40 // Version identifier for the statement information format.
42 // The number of bytes following the prologue_length field to the beginning
43 // of the first byte of the statement program itself.
44 uint32_t PrologueLength;
45 // The size in bytes of the smallest target machine instruction. Statement
46 // program opcodes that alter the address register first multiply their
47 // operands by this value.
48 uint8_t MinInstLength;
49 // The initial value of theis_stmtregister.
50 uint8_t DefaultIsStmt;
51 // This parameter affects the meaning of the special opcodes. See below.
53 // This parameter affects the meaning of the special opcodes. See below.
55 // The number assigned to the first special opcode.
57 std::vector<uint8_t> StandardOpcodeLengths;
58 std::vector<const char*> IncludeDirectories;
59 std::vector<FileNameEntry> FileNames;
61 // Length of the prologue in bytes.
62 uint32_t getLength() const {
63 return PrologueLength + sizeof(TotalLength) + sizeof(Version) +
64 sizeof(PrologueLength);
66 // Length of the line table data in bytes (not including the prologue).
67 uint32_t getStatementTableLength() const {
68 return TotalLength + sizeof(TotalLength) - getLength();
70 int32_t getMaxLineIncrementForSpecialOpcode() const {
71 return LineBase + (int8_t)LineRange - 1;
73 void dump(raw_ostream &OS) const;
75 TotalLength = Version = PrologueLength = 0;
76 MinInstLength = LineBase = LineRange = OpcodeBase = 0;
77 StandardOpcodeLengths.clear();
78 IncludeDirectories.clear();
83 // Standard .debug_line state machine structure.
85 Row(bool default_is_stmt = false) { reset(default_is_stmt); }
86 /// Called after a row is appended to the matrix.
88 void reset(bool default_is_stmt);
89 void dump(raw_ostream &OS) const;
91 // The program-counter value corresponding to a machine instruction
92 // generated by the compiler.
94 // An unsigned integer indicating a source line number. Lines are numbered
95 // beginning at 1. The compiler may emit the value 0 in cases where an
96 // instruction cannot be attributed to any source line.
98 // An unsigned integer indicating a column number within a source line.
99 // Columns are numbered beginning at 1. The value 0 is reserved to indicate
100 // that a statement begins at the 'left edge' of the line.
102 // An unsigned integer indicating the identity of the source file
103 // corresponding to a machine instruction.
105 // An unsigned integer whose value encodes the applicable instruction set
106 // architecture for the current instruction.
108 // A boolean indicating that the current instruction is the beginning of a
111 // A boolean indicating that the current instruction is the
112 // beginning of a basic block.
114 // A boolean indicating that the current address is that of the
115 // first byte after the end of a sequence of target machine
118 // A boolean indicating that the current address is one (of possibly
119 // many) where execution should be suspended for an entry breakpoint
122 // A boolean indicating that the current address is one (of possibly
123 // many) where execution should be suspended for an exit breakpoint
129 void appendRow(const DWARFDebugLine::Row &state) { Rows.push_back(state); }
135 uint32_t lookupAddress(uint64_t address, uint64_t cu_high_pc) const;
136 void dump(raw_ostream &OS) const;
138 struct Prologue Prologue;
139 std::vector<Row> Rows;
142 struct State : public Row, public LineTable {
143 // Special row codes.
145 StartParsingLineTable = 0,
146 DoneParsingLineTable = -1
149 State() : row(StartParsingLineTable) {}
152 virtual void appendRowToMatrix(uint32_t offset);
153 virtual void finalize(uint32_t offset) { row = DoneParsingLineTable; }
154 virtual void reset() { Row::reset(Prologue.DefaultIsStmt); }
156 // The row number that starts at zero for the prologue, and increases for
157 // each row added to the matrix.
161 struct DumpingState : public State {
162 DumpingState(raw_ostream &OS) : OS(OS) {}
163 virtual ~DumpingState();
164 virtual void finalize(uint32_t offset);
169 static bool parsePrologue(DataExtractor debug_line_data, uint32_t *offset_ptr,
171 /// Parse a single line table (prologue and all rows).
172 static bool parseStatementTable(DataExtractor debug_line_data,
173 uint32_t *offset_ptr, State &state);
175 const LineTable *getLineTable(uint32_t offset) const;
176 const LineTable *getOrParseLineTable(DataExtractor debug_line_data,
180 typedef std::map<uint32_t, LineTable> LineTableMapTy;
181 typedef LineTableMapTy::iterator LineTableIter;
182 typedef LineTableMapTy::const_iterator LineTableConstIter;
184 LineTableMapTy LineTableMap;