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//===-- 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 SymbolFileDWARF_DWARFDebugLine_h_
#define SymbolFileDWARF_DWARFDebugLine_h_
#include <map>
#include <string>
#include <vector>
#include "lldb/Utility/FileSpec.h"
#include "lldb/lldb-private.h"
#include "DWARFDataExtractor.h"
#include "DWARFDefines.h"
#include "llvm/Support/MD5.h"
class DWARFUnit;
class SymbolFileDWARF;
//----------------------------------------------------------------------
// DWARFDebugLine
//----------------------------------------------------------------------
class DWARFDebugLine {
public:
//------------------------------------------------------------------
// FileNameEntry
//------------------------------------------------------------------
struct FileNameEntry {
FileNameEntry() : name(nullptr), dir_idx(0), mod_time(0), length(0) {}
const char *name;
dw_sleb128_t dir_idx;
dw_sleb128_t mod_time;
dw_sleb128_t length;
llvm::MD5::MD5Result checksum;
};
//------------------------------------------------------------------
// Prologue
//------------------------------------------------------------------
struct Prologue {
Prologue()
: total_length(0), version(0), prologue_length(0), min_inst_length(0),
default_is_stmt(0), line_base(0), line_range(0), opcode_base(0),
standard_opcode_lengths(), include_directories(), file_names() {}
typedef std::shared_ptr<Prologue> shared_ptr;
uint32_t total_length; // The size in bytes of the statement information for
// this compilation unit (not including the
// total_length field itself).
uint16_t
version; // Version identifier for the statement information format.
uint8_t address_size;
uint8_t segment_selector_size;
uint32_t prologue_length; // The number of bytes following the
// prologue_length field to the beginning of the
// first byte of the statement program itself.
uint8_t min_inst_length; // 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 maximum_operations_per_instruction; // New in DWARF4. The maximum
// number of individual
// operations that may be
// encoded in an instruction.
uint8_t default_is_stmt; // The initial value of theis_stmtregister.
int8_t line_base; // This parameter affects the meaning of the special
// opcodes. See below.
uint8_t line_range; // This parameter affects the meaning of the special
// opcodes. See below.
uint8_t opcode_base; // The number assigned to the first special opcode.
std::vector<uint8_t> standard_opcode_lengths;
std::vector<const char *> include_directories;
std::vector<FileNameEntry> file_names;
int32_t MaxLineIncrementForSpecialOpcode() const {
return line_base + (int8_t)line_range - 1;
}
bool IsValid() const;
// void Append(BinaryStreamBuf& buff) const;
void Dump(lldb_private::Log *log);
void Clear() {
total_length = version = prologue_length = min_inst_length = line_base =
line_range = opcode_base = 0;
line_base = 0;
standard_opcode_lengths.clear();
include_directories.clear();
file_names.clear();
}
bool GetFile(uint32_t file_idx, const lldb_private::FileSpec &cu_comp_dir,
lldb_private::FileSpec::Style style,
lldb_private::FileSpec &file) const;
};
// Standard .debug_line state machine structure
struct Row {
typedef std::vector<Row> collection;
typedef collection::iterator iterator;
typedef collection::const_iterator const_iterator;
Row(bool default_is_stmt = false);
virtual ~Row() {}
void PostAppend();
void Reset(bool default_is_stmt);
void Dump(lldb_private::Log *log) const;
static void Insert(Row::collection &state_coll, const Row &state);
static void Dump(lldb_private::Log *log, const Row::collection &state_coll);
dw_addr_t address; // The program-counter value corresponding to a machine
// instruction generated by the compiler.
uint32_t line; // 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.
uint16_t column; // 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 file; // An unsigned integer indicating the identity of the source
// file corresponding to a machine instruction.
uint8_t is_stmt : 1, // A boolean indicating that the current instruction is
// the beginning of a statement.
basic_block : 1, // A boolean indicating that the current instruction is
// the beginning of a basic block.
end_sequence : 1, // A boolean indicating that the current address is
// that of the first byte after the end of a sequence
// of target machine instructions.
prologue_end : 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.
epilogue_begin : 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.
uint32_t isa; // An unsigned integer whose value encodes the applicable
// instruction set architecture for the current instruction.
};
//------------------------------------------------------------------
// LineTable
//------------------------------------------------------------------
struct LineTable {
typedef std::shared_ptr<LineTable> shared_ptr;
LineTable() : prologue(), rows() {}
void AppendRow(const DWARFDebugLine::Row &state);
void Clear() {
prologue.reset();
rows.clear();
}
uint32_t LookupAddress(dw_addr_t address, dw_addr_t cu_high_pc) const;
void Dump(lldb_private::Log *log) const;
Prologue::shared_ptr prologue;
Row::collection rows;
};
//------------------------------------------------------------------
// State
//------------------------------------------------------------------
struct State : public Row {
typedef void (*Callback)(dw_offset_t offset, const State &state,
void *userData);
// Special row codes used when calling the callback
enum { StartParsingLineTable = 0, DoneParsingLineTable = -1 };
State(Prologue::shared_ptr &prologue_sp, lldb_private::Log *log,
Callback callback, void *userData);
void AppendRowToMatrix(dw_offset_t offset);
void Finalize(dw_offset_t offset);
void Reset();
Prologue::shared_ptr prologue;
lldb_private::Log *log;
Callback callback; // Callback function that gets called each time an entry
// is to be added to the matrix
void *callbackUserData;
int row; // The row number that starts at zero for the prologue, and
// increases for each row added to the matrix
private:
DISALLOW_COPY_AND_ASSIGN(State);
};
static bool DumpOpcodes(
lldb_private::Log *log, SymbolFileDWARF *dwarf2Data,
dw_offset_t line_offset = DW_INVALID_OFFSET,
uint32_t dump_flags = 0); // If line_offset is invalid, dump everything
static bool DumpLineTableRows(
lldb_private::Log *log, SymbolFileDWARF *dwarf2Data,
dw_offset_t line_offset =
DW_INVALID_OFFSET); // If line_offset is invalid, dump everything
static bool
ParseSupportFiles(const lldb::ModuleSP &module_sp,
const lldb_private::DWARFDataExtractor &debug_line_data,
dw_offset_t stmt_list,
lldb_private::FileSpecList &support_files,
DWARFUnit *dwarf_cu);
static bool
ParsePrologue(const lldb_private::DWARFDataExtractor &debug_line_data,
lldb::offset_t *offset_ptr, Prologue *prologue,
DWARFUnit *dwarf_cu = nullptr);
static bool
ParseStatementTable(const lldb_private::DWARFDataExtractor &debug_line_data,
lldb::offset_t *offset_ptr, State::Callback callback,
void *userData, DWARFUnit *dwarf_cu);
static dw_offset_t
DumpStatementTable(lldb_private::Log *log,
const lldb_private::DWARFDataExtractor &debug_line_data,
const dw_offset_t line_offset);
static dw_offset_t
DumpStatementOpcodes(lldb_private::Log *log,
const lldb_private::DWARFDataExtractor &debug_line_data,
const dw_offset_t line_offset, uint32_t flags);
static bool
ParseStatementTable(const lldb_private::DWARFDataExtractor &debug_line_data,
lldb::offset_t *offset_ptr, LineTable *line_table,
DWARFUnit *dwarf_cu);
static void Parse(const lldb_private::DWARFDataExtractor &debug_line_data,
DWARFDebugLine::State::Callback callback, void *userData);
// static void AppendLineTableData(const DWARFDebugLine::Prologue* prologue,
// const DWARFDebugLine::Row::collection& state_coll, const uint32_t
// addr_size, BinaryStreamBuf &debug_line_data);
DWARFDebugLine() : m_lineTableMap() {}
void Parse(const lldb_private::DWARFDataExtractor &debug_line_data);
void ParseIfNeeded(const lldb_private::DWARFDataExtractor &debug_line_data);
LineTable::shared_ptr GetLineTable(const dw_offset_t offset) const;
protected:
typedef std::map<dw_offset_t, LineTable::shared_ptr> LineTableMap;
typedef LineTableMap::iterator LineTableIter;
typedef LineTableMap::const_iterator LineTableConstIter;
LineTableMap m_lineTableMap;
};
#endif // SymbolFileDWARF_DWARFDebugLine_h_
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