From 30815c536baacc07e925f0aef23a5395883173dc Mon Sep 17 00:00:00 2001 From: Dimitry Andric Date: Thu, 20 Oct 2011 21:10:27 +0000 Subject: Vendor import of llvm release_30 branch r142614: http://llvm.org/svn/llvm-project/llvm/branches/release_30@142614 --- lib/DebugInfo/DWARFDebugLine.h | 190 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 190 insertions(+) create mode 100644 lib/DebugInfo/DWARFDebugLine.h (limited to 'lib/DebugInfo/DWARFDebugLine.h') diff --git a/lib/DebugInfo/DWARFDebugLine.h b/lib/DebugInfo/DWARFDebugLine.h new file mode 100644 index 000000000000..bc6a70b11120 --- /dev/null +++ b/lib/DebugInfo/DWARFDebugLine.h @@ -0,0 +1,190 @@ +//===-- DWARFDebugLine.h ----------------------------------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_DEBUGINFO_DWARFDEBUGLINE_H +#define LLVM_DEBUGINFO_DWARFDEBUGLINE_H + +#include "llvm/Support/DataExtractor.h" +#include +#include +#include + +namespace llvm { + +class raw_ostream; + +class DWARFDebugLine { +public: + struct FileNameEntry { + FileNameEntry() : DirIdx(0), ModTime(0), Length(0) {} + + std::string Name; + uint64_t DirIdx; + uint64_t ModTime; + uint64_t Length; + }; + + struct Prologue { + Prologue() + : TotalLength(0), Version(0), PrologueLength(0), MinInstLength(0), + DefaultIsStmt(0), LineBase(0), LineRange(0), OpcodeBase(0) {} + + // The size in bytes of the statement information for this compilation unit + // (not including the total_length field itself). + uint32_t TotalLength; + // Version identifier for the statement information format. + uint16_t Version; + // The number of bytes following the prologue_length field to the beginning + // of the first byte of the statement program itself. + uint32_t PrologueLength; + // The size in bytes of the smallest target machine instruction. Statement + // program opcodes that alter the address register first multiply their + // operands by this value. + uint8_t MinInstLength; + // The initial value of theis_stmtregister. + uint8_t DefaultIsStmt; + // This parameter affects the meaning of the special opcodes. See below. + int8_t LineBase; + // This parameter affects the meaning of the special opcodes. See below. + uint8_t LineRange; + // The number assigned to the first special opcode. + uint8_t OpcodeBase; + std::vector StandardOpcodeLengths; + std::vector IncludeDirectories; + std::vector FileNames; + + // Length of the prologue in bytes. + uint32_t getLength() const { + return PrologueLength + sizeof(TotalLength) + sizeof(Version) + + sizeof(PrologueLength); + } + // Length of the line table data in bytes (not including the prologue). + uint32_t getStatementTableLength() const { + return TotalLength + sizeof(TotalLength) - getLength(); + } + int32_t getMaxLineIncrementForSpecialOpcode() const { + return LineBase + (int8_t)LineRange - 1; + } + void dump(raw_ostream &OS) const; + void clear() { + TotalLength = Version = PrologueLength = 0; + MinInstLength = LineBase = LineRange = OpcodeBase = 0; + StandardOpcodeLengths.clear(); + IncludeDirectories.clear(); + FileNames.clear(); + } + }; + + // Standard .debug_line state machine structure. + struct Row { + Row(bool default_is_stmt = false) { reset(default_is_stmt); } + /// Called after a row is appended to the matrix. + void postAppend(); + void reset(bool default_is_stmt); + void dump(raw_ostream &OS) const; + + // The program-counter value corresponding to a machine instruction + // generated by the compiler. + uint64_t Address; + // An unsigned integer indicating a source line number. Lines are numbered + // beginning at 1. The compiler may emit the value 0 in cases where an + // instruction cannot be attributed to any source line. + uint32_t Line; + // An unsigned integer indicating a column number within a source line. + // Columns are numbered beginning at 1. The value 0 is reserved to indicate + // that a statement begins at the 'left edge' of the line. + uint16_t Column; + // An unsigned integer indicating the identity of the source file + // corresponding to a machine instruction. + uint16_t File; + // An unsigned integer whose value encodes the applicable instruction set + // architecture for the current instruction. + uint8_t Isa; + // A boolean indicating that the current instruction is the beginning of a + // statement. + uint8_t IsStmt:1, + // A boolean indicating that the current instruction is the + // beginning of a basic block. + BasicBlock:1, + // A boolean indicating that the current address is that of the + // first byte after the end of a sequence of target machine + // instructions. + EndSequence:1, + // A boolean indicating that the current address is one (of possibly + // many) where execution should be suspended for an entry breakpoint + // of a function. + PrologueEnd:1, + // A boolean indicating that the current address is one (of possibly + // many) where execution should be suspended for an exit breakpoint + // of a function. + EpilogueBegin:1; + }; + + struct LineTable { + void appendRow(const DWARFDebugLine::Row &state) { Rows.push_back(state); } + void clear() { + Prologue.clear(); + Rows.clear(); + } + + uint32_t lookupAddress(uint64_t address, uint64_t cu_high_pc) const; + void dump(raw_ostream &OS) const; + + struct Prologue Prologue; + std::vector Rows; + }; + + struct State : public Row, public LineTable { + // Special row codes. + enum { + StartParsingLineTable = 0, + DoneParsingLineTable = -1 + }; + + State() : row(StartParsingLineTable) {} + virtual ~State(); + + virtual void appendRowToMatrix(uint32_t offset); + virtual void finalize(uint32_t offset) { row = DoneParsingLineTable; } + virtual void reset() { Row::reset(Prologue.DefaultIsStmt); } + + // The row number that starts at zero for the prologue, and increases for + // each row added to the matrix. + unsigned row; + }; + + struct DumpingState : public State { + DumpingState(raw_ostream &OS) : OS(OS) {} + virtual ~DumpingState(); + virtual void finalize(uint32_t offset); + private: + raw_ostream &OS; + }; + + static bool parsePrologue(DataExtractor debug_line_data, uint32_t *offset_ptr, + Prologue *prologue); + /// Parse a single line table (prologue and all rows). + static bool parseStatementTable(DataExtractor debug_line_data, + uint32_t *offset_ptr, State &state); + + const LineTable *getLineTable(uint32_t offset) const; + const LineTable *getOrParseLineTable(DataExtractor debug_line_data, + uint32_t offset); + +private: + typedef std::map LineTableMapTy; + typedef LineTableMapTy::iterator LineTableIter; + typedef LineTableMapTy::const_iterator LineTableConstIter; + + LineTableMapTy LineTableMap; +}; + +} + +#endif -- cgit v1.2.3