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https://github.com/ziglang/zig.git
synced 2026-02-13 04:48:20 +00:00
Correct parsing of DWARF line_info section
This commit is contained in:
LemonBoy
parent
aff2e47821
commit
60e2a04322
304
std/debug.zig
304
std/debug.zig
@ -1213,7 +1213,6 @@ const CompileUnit = struct {
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version: u16,
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is_64: bool,
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die: *Die,
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index: usize,
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pc_range: ?PcRange,
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};
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@ -1787,173 +1786,165 @@ fn getLineNumberInfoMacOs(di: *DebugInfo, symbol: MachoSymbol, target_address: u
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fn getLineNumberInfoDwarf(di: *DwarfInfo, compile_unit: CompileUnit, target_address: usize) !LineInfo {
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const compile_unit_cwd = try compile_unit.die.getAttrString(di, DW.AT_comp_dir);
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const line_info_offset = try compile_unit.die.getAttrSecOffset(DW.AT_stmt_list);
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const debug_line_end = di.debug_line.offset + di.debug_line.size;
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var this_offset = di.debug_line.offset;
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var this_index: usize = 0;
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assert(line_info_offset < di.debug_line.size);
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while (this_offset < debug_line_end) : (this_index += 1) {
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try di.dwarf_seekable_stream.seekTo(this_offset);
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try di.dwarf_seekable_stream.seekTo(di.debug_line.offset + line_info_offset);
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var is_64: bool = undefined;
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const unit_length = try readInitialLength(@typeOf(di.dwarf_in_stream.readFn).ReturnType.ErrorSet, di.dwarf_in_stream, &is_64);
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if (unit_length == 0) return error.MissingDebugInfo;
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const next_offset = unit_length + (if (is_64) usize(12) else usize(4));
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var is_64: bool = undefined;
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const unit_length = try readInitialLength(@typeOf(di.dwarf_in_stream.readFn).ReturnType.ErrorSet, di.dwarf_in_stream, &is_64);
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if (unit_length == 0) {
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return error.MissingDebugInfo;
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}
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const next_offset = unit_length + (if (is_64) usize(12) else usize(4));
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if (compile_unit.index != this_index) {
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this_offset += next_offset;
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continue;
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const version = try di.dwarf_in_stream.readInt(u16, di.endian);
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// TODO support 3 and 5
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if (version != 2 and version != 4) return error.InvalidDebugInfo;
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const prologue_length = if (is_64) try di.dwarf_in_stream.readInt(u64, di.endian) else try di.dwarf_in_stream.readInt(u32, di.endian);
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const prog_start_offset = (try di.dwarf_seekable_stream.getPos()) + prologue_length;
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const minimum_instruction_length = try di.dwarf_in_stream.readByte();
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if (minimum_instruction_length == 0) return error.InvalidDebugInfo;
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if (version >= 4) {
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// maximum_operations_per_instruction
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_ = try di.dwarf_in_stream.readByte();
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}
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const default_is_stmt = (try di.dwarf_in_stream.readByte()) != 0;
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const line_base = try di.dwarf_in_stream.readByteSigned();
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const line_range = try di.dwarf_in_stream.readByte();
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if (line_range == 0) return error.InvalidDebugInfo;
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const opcode_base = try di.dwarf_in_stream.readByte();
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const standard_opcode_lengths = try di.allocator().alloc(u8, opcode_base - 1);
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{
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var i: usize = 0;
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while (i < opcode_base - 1) : (i += 1) {
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standard_opcode_lengths[i] = try di.dwarf_in_stream.readByte();
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}
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}
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const version = try di.dwarf_in_stream.readInt(u16, di.endian);
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// TODO support 3 and 5
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if (version != 2 and version != 4) return error.InvalidDebugInfo;
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var include_directories = ArrayList([]u8).init(di.allocator());
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try include_directories.append(compile_unit_cwd);
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while (true) {
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const dir = try di.readString();
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if (dir.len == 0) break;
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try include_directories.append(dir);
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}
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const prologue_length = if (is_64) try di.dwarf_in_stream.readInt(u64, di.endian) else try di.dwarf_in_stream.readInt(u32, di.endian);
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const prog_start_offset = (try di.dwarf_seekable_stream.getPos()) + prologue_length;
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var file_entries = ArrayList(FileEntry).init(di.allocator());
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var prog = LineNumberProgram.init(default_is_stmt, include_directories.toSliceConst(), &file_entries, target_address);
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const minimum_instruction_length = try di.dwarf_in_stream.readByte();
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if (minimum_instruction_length == 0) return error.InvalidDebugInfo;
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while (true) {
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const file_name = try di.readString();
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if (file_name.len == 0) break;
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const dir_index = try readULeb128(di.dwarf_in_stream);
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const mtime = try readULeb128(di.dwarf_in_stream);
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const len_bytes = try readULeb128(di.dwarf_in_stream);
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try file_entries.append(FileEntry{
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.file_name = file_name,
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.dir_index = dir_index,
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.mtime = mtime,
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.len_bytes = len_bytes,
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});
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}
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if (version >= 4) {
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// maximum_operations_per_instruction
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_ = try di.dwarf_in_stream.readByte();
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}
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try di.dwarf_seekable_stream.seekTo(prog_start_offset);
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const default_is_stmt = (try di.dwarf_in_stream.readByte()) != 0;
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const line_base = try di.dwarf_in_stream.readByteSigned();
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while (true) {
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const opcode = try di.dwarf_in_stream.readByte();
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const line_range = try di.dwarf_in_stream.readByte();
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if (line_range == 0) return error.InvalidDebugInfo;
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const opcode_base = try di.dwarf_in_stream.readByte();
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const standard_opcode_lengths = try di.allocator().alloc(u8, opcode_base - 1);
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{
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var i: usize = 0;
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while (i < opcode_base - 1) : (i += 1) {
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standard_opcode_lengths[i] = try di.dwarf_in_stream.readByte();
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if (opcode == DW.LNS_extended_op) {
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const op_size = try readULeb128(di.dwarf_in_stream);
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if (op_size < 1) return error.InvalidDebugInfo;
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var sub_op = try di.dwarf_in_stream.readByte();
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switch (sub_op) {
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DW.LNE_end_sequence => {
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prog.end_sequence = true;
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if (try prog.checkLineMatch()) |info| return info;
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return error.MissingDebugInfo;
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},
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DW.LNE_set_address => {
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const addr = try di.dwarf_in_stream.readInt(usize, di.endian);
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prog.address = addr;
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},
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DW.LNE_define_file => {
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const file_name = try di.readString();
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const dir_index = try readULeb128(di.dwarf_in_stream);
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const mtime = try readULeb128(di.dwarf_in_stream);
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const len_bytes = try readULeb128(di.dwarf_in_stream);
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try file_entries.append(FileEntry{
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.file_name = file_name,
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.dir_index = dir_index,
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.mtime = mtime,
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.len_bytes = len_bytes,
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});
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},
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else => {
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const fwd_amt = math.cast(isize, op_size - 1) catch return error.InvalidDebugInfo;
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try di.dwarf_seekable_stream.seekForward(fwd_amt);
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},
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}
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} else if (opcode >= opcode_base) {
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// special opcodes
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const adjusted_opcode = opcode - opcode_base;
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const inc_addr = minimum_instruction_length * (adjusted_opcode / line_range);
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const inc_line = i32(line_base) + i32(adjusted_opcode % line_range);
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prog.line += inc_line;
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prog.address += inc_addr;
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if (try prog.checkLineMatch()) |info| return info;
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prog.basic_block = false;
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} else {
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switch (opcode) {
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DW.LNS_copy => {
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if (try prog.checkLineMatch()) |info| return info;
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prog.basic_block = false;
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},
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DW.LNS_advance_pc => {
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const arg = try readULeb128(di.dwarf_in_stream);
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prog.address += arg * minimum_instruction_length;
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},
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DW.LNS_advance_line => {
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const arg = try readILeb128(di.dwarf_in_stream);
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prog.line += arg;
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},
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DW.LNS_set_file => {
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const arg = try readULeb128(di.dwarf_in_stream);
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prog.file = arg;
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},
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DW.LNS_set_column => {
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const arg = try readULeb128(di.dwarf_in_stream);
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prog.column = arg;
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},
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DW.LNS_negate_stmt => {
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prog.is_stmt = !prog.is_stmt;
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},
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DW.LNS_set_basic_block => {
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prog.basic_block = true;
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},
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DW.LNS_const_add_pc => {
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const inc_addr = minimum_instruction_length * ((255 - opcode_base) / line_range);
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prog.address += inc_addr;
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},
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DW.LNS_fixed_advance_pc => {
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const arg = try di.dwarf_in_stream.readInt(u16, di.endian);
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prog.address += arg;
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},
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DW.LNS_set_prologue_end => {},
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else => {
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if (opcode - 1 >= standard_opcode_lengths.len) return error.InvalidDebugInfo;
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const len_bytes = standard_opcode_lengths[opcode - 1];
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try di.dwarf_seekable_stream.seekForward(len_bytes);
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},
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}
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}
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var include_directories = ArrayList([]u8).init(di.allocator());
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try include_directories.append(compile_unit_cwd);
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while (true) {
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const dir = try di.readString();
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if (dir.len == 0) break;
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try include_directories.append(dir);
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}
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var file_entries = ArrayList(FileEntry).init(di.allocator());
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var prog = LineNumberProgram.init(default_is_stmt, include_directories.toSliceConst(), &file_entries, target_address);
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while (true) {
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const file_name = try di.readString();
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if (file_name.len == 0) break;
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const dir_index = try readULeb128(di.dwarf_in_stream);
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const mtime = try readULeb128(di.dwarf_in_stream);
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const len_bytes = try readULeb128(di.dwarf_in_stream);
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try file_entries.append(FileEntry{
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.file_name = file_name,
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.dir_index = dir_index,
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.mtime = mtime,
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.len_bytes = len_bytes,
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});
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}
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try di.dwarf_seekable_stream.seekTo(prog_start_offset);
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while (true) {
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const opcode = try di.dwarf_in_stream.readByte();
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if (opcode == DW.LNS_extended_op) {
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const op_size = try readULeb128(di.dwarf_in_stream);
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if (op_size < 1) return error.InvalidDebugInfo;
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var sub_op = try di.dwarf_in_stream.readByte();
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switch (sub_op) {
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DW.LNE_end_sequence => {
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prog.end_sequence = true;
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if (try prog.checkLineMatch()) |info| return info;
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return error.MissingDebugInfo;
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},
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DW.LNE_set_address => {
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const addr = try di.dwarf_in_stream.readInt(usize, di.endian);
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prog.address = addr;
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},
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DW.LNE_define_file => {
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const file_name = try di.readString();
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const dir_index = try readULeb128(di.dwarf_in_stream);
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const mtime = try readULeb128(di.dwarf_in_stream);
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const len_bytes = try readULeb128(di.dwarf_in_stream);
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try file_entries.append(FileEntry{
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.file_name = file_name,
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.dir_index = dir_index,
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.mtime = mtime,
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.len_bytes = len_bytes,
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});
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},
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else => {
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const fwd_amt = math.cast(isize, op_size - 1) catch return error.InvalidDebugInfo;
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try di.dwarf_seekable_stream.seekForward(fwd_amt);
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},
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}
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} else if (opcode >= opcode_base) {
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// special opcodes
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const adjusted_opcode = opcode - opcode_base;
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const inc_addr = minimum_instruction_length * (adjusted_opcode / line_range);
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const inc_line = i32(line_base) + i32(adjusted_opcode % line_range);
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prog.line += inc_line;
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prog.address += inc_addr;
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if (try prog.checkLineMatch()) |info| return info;
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prog.basic_block = false;
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} else {
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switch (opcode) {
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DW.LNS_copy => {
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if (try prog.checkLineMatch()) |info| return info;
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prog.basic_block = false;
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},
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DW.LNS_advance_pc => {
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const arg = try readULeb128(di.dwarf_in_stream);
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prog.address += arg * minimum_instruction_length;
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},
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DW.LNS_advance_line => {
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const arg = try readILeb128(di.dwarf_in_stream);
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prog.line += arg;
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},
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DW.LNS_set_file => {
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const arg = try readULeb128(di.dwarf_in_stream);
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prog.file = arg;
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},
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DW.LNS_set_column => {
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const arg = try readULeb128(di.dwarf_in_stream);
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prog.column = arg;
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},
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DW.LNS_negate_stmt => {
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prog.is_stmt = !prog.is_stmt;
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},
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DW.LNS_set_basic_block => {
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prog.basic_block = true;
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},
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DW.LNS_const_add_pc => {
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const inc_addr = minimum_instruction_length * ((255 - opcode_base) / line_range);
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prog.address += inc_addr;
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},
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DW.LNS_fixed_advance_pc => {
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const arg = try di.dwarf_in_stream.readInt(u16, di.endian);
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prog.address += arg;
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},
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DW.LNS_set_prologue_end => {},
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else => {
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if (opcode - 1 >= standard_opcode_lengths.len) return error.InvalidDebugInfo;
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const len_bytes = standard_opcode_lengths[opcode - 1];
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try di.dwarf_seekable_stream.seekForward(len_bytes);
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},
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}
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}
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}
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this_offset += next_offset;
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}
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return error.MissingDebugInfo;
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@ -1962,7 +1953,6 @@ fn getLineNumberInfoDwarf(di: *DwarfInfo, compile_unit: CompileUnit, target_addr
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fn scanAllCompileUnits(di: *DwarfInfo) !void {
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const debug_info_end = di.debug_info.offset + di.debug_info.size;
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var this_unit_offset = di.debug_info.offset;
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var cu_index: usize = 0;
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while (this_unit_offset < debug_info_end) {
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try di.dwarf_seekable_stream.seekTo(this_unit_offset);
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@ -2019,11 +2009,9 @@ fn scanAllCompileUnits(di: *DwarfInfo) !void {
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.is_64 = is_64,
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.pc_range = pc_range,
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.die = compile_unit_die,
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.index = cu_index,
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});
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this_unit_offset += next_offset;
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cu_index += 1;
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}
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}
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