Commit f6148f123e
lib/std/dwarf/EH.zig
@@ -0,0 +1,19 @@
+pub const PE = struct {
+ pub const absptr = 0x00;
+ pub const uleb128 = 0x01;
+ pub const udata2 = 0x02;
+ pub const udata4 = 0x03;
+ pub const udata8 = 0x04;
+ pub const sleb128 = 0x09;
+ pub const sdata2 = 0x0A;
+ pub const sdata4 = 0x0B;
+ pub const sdata8 = 0x0C;
+
+ pub const pcrel = 0x10;
+ pub const textrel = 0x20;
+ pub const datarel = 0x30;
+ pub const funcrel = 0x40;
+ pub const aligned = 0x50;
+
+ pub const omit = 0xff;
+};
lib/std/debug.zig
@@ -800,52 +800,20 @@ fn readCoffDebugInfo(allocator: mem.Allocator, coff_bytes: []const u8) !ModuleDe
// This coff file has embedded DWARF debug info
_ = sec;
- const debug_info = coff_obj.getSectionDataAlloc(".debug_info", allocator) catch return error.MissingDebugInfo;
- errdefer allocator.free(debug_info);
- const debug_abbrev = coff_obj.getSectionDataAlloc(".debug_abbrev", allocator) catch return error.MissingDebugInfo;
- errdefer allocator.free(debug_abbrev);
- const debug_str = coff_obj.getSectionDataAlloc(".debug_str", allocator) catch return error.MissingDebugInfo;
- errdefer allocator.free(debug_str);
- const debug_line = coff_obj.getSectionDataAlloc(".debug_line", allocator) catch return error.MissingDebugInfo;
- errdefer allocator.free(debug_line);
-
- const debug_str_offsets = coff_obj.getSectionDataAlloc(".debug_str_offsets", allocator) catch null;
- const debug_line_str = coff_obj.getSectionDataAlloc(".debug_line_str", allocator) catch null;
- const debug_ranges = coff_obj.getSectionDataAlloc(".debug_ranges", allocator) catch null;
- const debug_loclists = coff_obj.getSectionDataAlloc(".debug_loclists", allocator) catch null;
- const debug_rnglists = coff_obj.getSectionDataAlloc(".debug_rnglists", allocator) catch null;
- const debug_addr = coff_obj.getSectionDataAlloc(".debug_addr", allocator) catch null;
- const debug_names = coff_obj.getSectionDataAlloc(".debug_names", allocator) catch null;
- const debug_frame = coff_obj.getSectionDataAlloc(".debug_frame", allocator) catch null;
+ const num_sections = std.enums.directEnumArrayLen(DW.DwarfSection, 0);
+ var sections: [num_sections]?[]const u8 = [_]?[]const u8{null} ** num_sections;
+ errdefer for (sections) |section| if (section) |s| allocator.free(s);
+
+ inline for (@typeInfo(DW.DwarfSection).Enum.fields, 0..) |section, i| {
+ sections[i] = try coff_obj.getSectionDataAlloc("." ++ section.name, allocator);
+ }
var dwarf = DW.DwarfInfo{
.endian = native_endian,
- .debug_info = debug_info,
- .debug_abbrev = debug_abbrev,
- .debug_str = debug_str,
- .debug_str_offsets = debug_str_offsets,
- .debug_line = debug_line,
- .debug_line_str = debug_line_str,
- .debug_ranges = debug_ranges,
- .debug_loclists = debug_loclists,
- .debug_rnglists = debug_rnglists,
- .debug_addr = debug_addr,
- .debug_names = debug_names,
- .debug_frame = debug_frame,
- };
-
- DW.openDwarfDebugInfo(&dwarf, allocator) catch |err| {
- if (debug_str_offsets) |d| allocator.free(d);
- if (debug_line_str) |d| allocator.free(d);
- if (debug_ranges) |d| allocator.free(d);
- if (debug_loclists) |d| allocator.free(d);
- if (debug_rnglists) |d| allocator.free(d);
- if (debug_addr) |d| allocator.free(d);
- if (debug_names) |d| allocator.free(d);
- if (debug_frame) |d| allocator.free(d);
- return err;
+ .sections = sections,
};
+ try DW.openDwarfDebugInfo(&dwarf, allocator);
di.debug_data = PdbOrDwarf{ .dwarf = dwarf };
return di;
}
@@ -901,7 +869,7 @@ pub fn readElfDebugInfo(
};
const mapped_mem = try mapWholeFile(elf_file);
- if (expected_crc) |crc| if (crc != std.hash.crc.Crc32SmallWithPoly(.IEEE).hash(mapped_mem)) return error.MissingDebugInfo;
+ if (expected_crc) |crc| if (crc != std.hash.crc.Crc32SmallWithPoly(.IEEE).hash(mapped_mem)) return error.InvalidDebugInfo;
const hdr: *const elf.Ehdr = @ptrCast(&mapped_mem[0]);
if (!mem.eql(u8, hdr.e_ident[0..4], elf.MAGIC)) return error.InvalidElfMagic;
@@ -916,36 +884,23 @@ pub fn readElfDebugInfo(
const shoff = hdr.e_shoff;
const str_section_off = shoff + @as(u64, hdr.e_shentsize) * @as(u64, hdr.e_shstrndx);
- const str_shdr: *const elf.Shdr = @ptrCast(@alignCast(
- &mapped_mem[math.cast(usize, str_section_off) orelse return error.Overflow],
- ));
- const header_strings = mapped_mem[str_shdr.sh_offset .. str_shdr.sh_offset + str_shdr.sh_size];
+ const str_shdr: *const elf.Shdr = @ptrCast(@alignCast(&mapped_mem[math.cast(usize, str_section_off) orelse return error.Overflow]));
+ const header_strings = mapped_mem[str_shdr.sh_offset..][0..str_shdr.sh_size];
const shdrs = @as(
[*]const elf.Shdr,
@ptrCast(@alignCast(&mapped_mem[shoff])),
)[0..hdr.e_shnum];
- var opt_debug_info: ?[]const u8 = null;
- var opt_debug_abbrev: ?[]const u8 = null;
- var opt_debug_str: ?[]const u8 = null;
- var opt_debug_str_offsets: ?[]const u8 = null;
- var opt_debug_line: ?[]const u8 = null;
- var opt_debug_line_str: ?[]const u8 = null;
- var opt_debug_ranges: ?[]const u8 = null;
- var opt_debug_loclists: ?[]const u8 = null;
- var opt_debug_rnglists: ?[]const u8 = null;
- var opt_debug_addr: ?[]const u8 = null;
- var opt_debug_names: ?[]const u8 = null;
- var opt_debug_frame: ?[]const u8 = null;
-
- var owned_sections: [ModuleDebugInfo.num_sections][]const u8 = [_][]const u8{&.{}} ** ModuleDebugInfo.num_sections;
+ const num_sections = std.enums.directEnumArrayLen(DW.DwarfSection, 0);
+ var sections: [num_sections]?[]const u8 = [_]?[]const u8{null} ** num_sections;
+ var owned_sections: [num_sections][]const u8 = [_][]const u8{&.{}} ** num_sections;
errdefer for (owned_sections) |section| allocator.free(section);
var separate_debug_filename: ?[]const u8 = null;
var separate_debug_crc: ?u32 = null;
for (shdrs) |*shdr| {
- if (shdr.sh_type == elf.SHT_NULL) continue;
+ if (shdr.sh_type == elf.SHT_NULL or shdr.sh_type == elf.SHT_NOBITS) continue;
const name = mem.sliceTo(header_strings[shdr.sh_name..], 0);
if (mem.eql(u8, name, ".gnu_debuglink")) {
@@ -958,26 +913,11 @@ pub fn readElfDebugInfo(
continue;
}
- const sections = [_]struct { name: []const u8, out: *?[]const u8 }{
- .{ .name = ".debug_info", .out = &opt_debug_info },
- .{ .name = ".debug_abbrev", .out = &opt_debug_abbrev },
- .{ .name = ".debug_str", .out = &opt_debug_str },
- .{ .name = ".debug_str_offsets", .out = &opt_debug_str_offsets },
- .{ .name = ".debug_line", .out = &opt_debug_line },
- .{ .name = ".debug_line_str", .out = &opt_debug_line_str },
- .{ .name = ".debug_ranges", .out = &opt_debug_ranges },
- .{ .name = ".debug_loclists", .out = &opt_debug_loclists },
- .{ .name = ".debug_rnglists", .out = &opt_debug_rnglists },
- .{ .name = ".debug_addr", .out = &opt_debug_addr },
- .{ .name = ".debug_names", .out = &opt_debug_names },
- .{ .name = ".debug_frame", .out = &opt_debug_frame },
- };
-
- var section_index = for (sections, 0..) |section, i| {
- if (mem.eql(u8, section.name, name)) {
- break i;
- }
- } else continue;
+ var section_index: ?usize = null;
+ inline for (@typeInfo(DW.DwarfSection).Enum.fields, 0..) |section, i| {
+ if (mem.eql(u8, "." ++ section.name, name)) section_index = i;
+ }
+ if (section_index == null) continue;
const section_bytes = try chopSlice(mapped_mem, shdr.sh_offset, shdr.sh_size);
if ((shdr.sh_flags & elf.SHF_COMPRESSED) > 0) {
@@ -997,25 +937,24 @@ pub fn readElfDebugInfo(
const read = zlib_stream.reader().readAll(decompressed_section) catch continue;
assert(read == decompressed_section.len);
- sections[section_index].out.* = decompressed_section;
- owned_sections[section_index] = decompressed_section;
+ sections[section_index.?] = decompressed_section;
+ owned_sections[section_index.?] = decompressed_section;
} else {
- sections[section_index].out.* = section_bytes;
- }
+ sections[section_index.?] = section_bytes;
+ }
}
const missing_debug_info =
- opt_debug_info == null or
- opt_debug_abbrev == null or
- opt_debug_str == null or
- opt_debug_line == null;
+ sections[@enumToInt(DW.DwarfSection.debug_info)] == null or
+ sections[@enumToInt(DW.DwarfSection.debug_abbrev)] == null or
+ sections[@enumToInt(DW.DwarfSection.debug_str)] == null or
+ sections[@enumToInt(DW.DwarfSection.debug_line)] == null;
// Attempt to load debug info from an external file
// See: https://sourceware.org/gdb/onlinedocs/gdb/Separate-Debug-Files.html
if (missing_debug_info) {
const global_debug_directories = [_][]const u8{
"/usr/lib/debug",
- // TODO: Determine the set of directories used by most distros for this path (check GDB sources)
};
// <global debug directory>/.build-id/<2-character id prefix>/<id remainder>.debug
@@ -1074,18 +1013,7 @@ pub fn readElfDebugInfo(
var di = DW.DwarfInfo{
.endian = endian,
- .debug_info = opt_debug_info.?,
- .debug_abbrev = opt_debug_abbrev.?,
- .debug_str = opt_debug_str.?,
- .debug_str_offsets = opt_debug_str_offsets,
- .debug_line = opt_debug_line.?,
- .debug_line_str = opt_debug_line_str,
- .debug_ranges = opt_debug_ranges,
- .debug_loclists = opt_debug_loclists,
- .debug_rnglists = opt_debug_rnglists,
- .debug_addr = opt_debug_addr,
- .debug_names = opt_debug_names,
- .debug_frame = opt_debug_frame,
+ .sections = sections,
};
try DW.openDwarfDebugInfo(&di, allocator);
@@ -1882,7 +1810,7 @@ pub const ModuleDebugInfo = switch (native_os) {
mapped_memory: []align(mem.page_size) const u8,
owned_sections: [num_sections][]const u8 = [_][]const u8{&.{}} ** num_sections,
- const num_sections = 12;
+ const num_sections = 14;
fn deinit(self: *@This(), allocator: mem.Allocator) void {
self.dwarf.deinit(allocator);
@@ -1916,7 +1844,7 @@ fn getSymbolFromDwarf(allocator: mem.Allocator, address: u64, di: *DW.DwarfInfo)
if (nosuspend di.findCompileUnit(address)) |compile_unit| {
return SymbolInfo{
.symbol_name = nosuspend di.getSymbolName(address) orelse "???",
- .compile_unit_name = compile_unit.die.getAttrString(di, DW.AT.name, di.debug_str, compile_unit.*) catch |err| switch (err) {
+ .compile_unit_name = compile_unit.die.getAttrString(di, DW.AT.name, di.section(.debug_str), compile_unit.*) catch |err| switch (err) {
error.MissingDebugInfo, error.InvalidDebugInfo => "???",
},
.line_info = nosuspend di.getLineNumberInfo(allocator, compile_unit.*, address) catch |err| switch (err) {
lib/std/dwarf.zig
@@ -13,6 +13,7 @@ pub const OP = @import("dwarf/OP.zig");
pub const LANG = @import("dwarf/LANG.zig");
pub const FORM = @import("dwarf/FORM.zig");
pub const ATE = @import("dwarf/ATE.zig");
+pub const EH = @import("dwarf/EH.zig");
pub const LLE = struct {
pub const end_of_list = 0x00;
@@ -337,7 +338,7 @@ const Die = struct {
FormValue.String => |value| return value,
FormValue.StrPtr => |offset| return di.getString(offset),
FormValue.StrOffset => |index| {
- const debug_str_offsets = di.debug_str_offsets orelse return badDwarf();
+ const debug_str_offsets = di.section(.debug_str_offsets) orelse return badDwarf();
if (compile_unit.str_offsets_base == 0) return badDwarf();
if (compile_unit.is_64) {
const byte_offset = compile_unit.str_offsets_base + 8 * index;
@@ -642,26 +643,36 @@ fn getAbbrevTableEntry(abbrev_table: *const AbbrevTable, abbrev_code: u64) ?*con
return null;
}
+pub const DwarfSection = enum {
+ debug_info,
+ debug_abbrev,
+ debug_str,
+ debug_str_offsets,
+ debug_line,
+ debug_line_str,
+ debug_ranges,
+ debug_loclists,
+ debug_rnglists,
+ debug_addr,
+ debug_names,
+ debug_frame,
+ eh_frame,
+ eh_frame_hdr,
+};
+
pub const DwarfInfo = struct {
endian: std.builtin.Endian,
// No memory is owned by the DwarfInfo
- debug_info: []const u8,
- debug_abbrev: []const u8,
- debug_str: []const u8,
- debug_str_offsets: ?[]const u8,
- debug_line: []const u8,
- debug_line_str: ?[]const u8,
- debug_ranges: ?[]const u8,
- debug_loclists: ?[]const u8,
- debug_rnglists: ?[]const u8,
- debug_addr: ?[]const u8,
- debug_names: ?[]const u8,
- debug_frame: ?[]const u8,
+ sections: [std.enums.directEnumArrayLen(DwarfSection, 0)]?[]const u8,
// Filled later by the initializer
abbrev_table_list: std.ArrayListUnmanaged(AbbrevTableHeader) = .{},
compile_unit_list: std.ArrayListUnmanaged(CompileUnit) = .{},
func_list: std.ArrayListUnmanaged(Func) = .{},
+ pub fn section(di: DwarfInfo, dwarf_section: DwarfSection) ?[]const u8 {
+ return di.sections[@enumToInt(dwarf_section)];
+ }
+
pub fn deinit(di: *DwarfInfo, allocator: mem.Allocator) void {
for (di.abbrev_table_list.items) |*abbrev| {
abbrev.deinit();
@@ -691,7 +702,7 @@ pub const DwarfInfo = struct {
}
fn scanAllFunctions(di: *DwarfInfo, allocator: mem.Allocator) !void {
- var stream = io.fixedBufferStream(di.debug_info);
+ var stream = io.fixedBufferStream(di.section(.debug_info).?);
const in = stream.reader();
const seekable = &stream.seekableStream();
var this_unit_offset: u64 = 0;
@@ -764,7 +775,7 @@ pub const DwarfInfo = struct {
// Prevent endless loops
while (depth > 0) : (depth -= 1) {
if (this_die_obj.getAttr(AT.name)) |_| {
- const name = try this_die_obj.getAttrString(di, AT.name, di.debug_str, compile_unit);
+ const name = try this_die_obj.getAttrString(di, AT.name, di.section(.debug_str), compile_unit);
break :x try allocator.dupe(u8, name);
} else if (this_die_obj.getAttr(AT.abstract_origin)) |_| {
// Follow the DIE it points to and repeat
@@ -836,7 +847,7 @@ pub const DwarfInfo = struct {
}
fn scanAllCompileUnits(di: *DwarfInfo, allocator: mem.Allocator) !void {
- var stream = io.fixedBufferStream(di.debug_info);
+ var stream = io.fixedBufferStream(di.section(.debug_info).?);
const in = &stream.reader();
const seekable = &stream.seekableStream();
var this_unit_offset: u64 = 0;
@@ -930,7 +941,7 @@ pub const DwarfInfo = struct {
if (target_address >= range.start and target_address < range.end) return compile_unit;
}
- const opt_debug_ranges = if (compile_unit.version >= 5) di.debug_rnglists else di.debug_ranges;
+ const opt_debug_ranges = if (compile_unit.version >= 5) di.section(.debug_rnglists) else di.section(.debug_ranges);
const debug_ranges = opt_debug_ranges orelse continue;
const ranges_val = compile_unit.die.getAttr(AT.ranges) orelse continue;
@@ -1065,7 +1076,7 @@ pub const DwarfInfo = struct {
}
fn parseAbbrevTable(di: *DwarfInfo, allocator: mem.Allocator, offset: u64) !AbbrevTable {
- var stream = io.fixedBufferStream(di.debug_abbrev);
+ var stream = io.fixedBufferStream(di.section(.debug_abbrev).?);
const in = &stream.reader();
const seekable = &stream.seekableStream();
@@ -1146,11 +1157,11 @@ pub const DwarfInfo = struct {
compile_unit: CompileUnit,
target_address: u64,
) !debug.LineInfo {
- var stream = io.fixedBufferStream(di.debug_line);
+ var stream = io.fixedBufferStream(di.section(.debug_line).?);
const in = &stream.reader();
const seekable = &stream.seekableStream();
- const compile_unit_cwd = try compile_unit.die.getAttrString(di, AT.comp_dir, di.debug_line_str, compile_unit);
+ const compile_unit_cwd = try compile_unit.die.getAttrString(di, AT.comp_dir, di.section(.debug_line_str), compile_unit);
const line_info_offset = try compile_unit.die.getAttrSecOffset(AT.stmt_list);
try seekable.seekTo(line_info_offset);
@@ -1416,15 +1427,15 @@ pub const DwarfInfo = struct {
}
fn getString(di: DwarfInfo, offset: u64) ![]const u8 {
- return getStringGeneric(di.debug_str, offset);
+ return getStringGeneric(di.section(.debug_str), offset);
}
fn getLineString(di: DwarfInfo, offset: u64) ![]const u8 {
- return getStringGeneric(di.debug_line_str, offset);
+ return getStringGeneric(di.section(.debug_line_str), offset);
}
fn readDebugAddr(di: DwarfInfo, compile_unit: CompileUnit, index: u64) !u64 {
- const debug_addr = di.debug_addr orelse return badDwarf();
+ const debug_addr = di.section(.debug_addr) orelse return badDwarf();
// addr_base points to the first item after the header, however we
// need to read the header to know the size of each item. Empirically,
@@ -1455,6 +1466,12 @@ pub const DwarfInfo = struct {
pub fn openDwarfDebugInfo(di: *DwarfInfo, allocator: mem.Allocator) !void {
try di.scanAllFunctions(allocator);
try di.scanAllCompileUnits(allocator);
+
+ // DEBUG
+ if (di.section(.eh_frame)) |eh_frame| {
+ _ = try CommonInformationEntry.parse(eh_frame, 8, .Little);
+ }
+
}
/// This function is to make it handy to comment out the return and make it
@@ -1477,3 +1494,157 @@ fn getStringGeneric(opt_str: ?[]const u8, offset: u64) ![:0]const u8 {
const last = mem.indexOfScalarPos(u8, str, casted_offset, 0) orelse return badDwarf();
return str[casted_offset..last :0];
}
+
+const EhPointer = struct {
+ value: union(enum) {
+ signed: i64,
+ unsigned: u64,
+ },
+ relative_to: u8,
+
+ // address of the encoded value
+ pc: u64,
+
+ // TODO: Function to resolve the value given input state (.text start, .eh_frame_hdr start, functions start)
+};
+
+fn readEhPointer(enc: u8, pc: usize, addr_size_bytes: u8, endian: std.builtin.Endian, reader: anytype) !?EhPointer {
+ if (enc == EH.PE.omit) return null;
+ return EhPointer{
+ .value = switch (enc & 0x0f) {
+ EH.PE.absptr => .{ .unsigned = switch (addr_size_bytes) {
+ 2 => try reader.readInt(u16, endian),
+ 4 => try reader.readInt(u32, endian),
+ 8 => try reader.readInt(u64, endian),
+ else => return error.InvalidAddrSize,
+ } },
+ EH.PE.uleb128 => .{ .unsigned = try leb.readULEB128(u64, reader) },
+ EH.PE.udata2 => .{ .unsigned = try reader.readInt(u16, endian) },
+ EH.PE.udata4 => .{ .unsigned = try reader.readInt(u32, endian) },
+ EH.PE.udata8 => .{ .unsigned = try reader.readInt(u64, endian) },
+ EH.PE.sleb128 => .{ .signed = try leb.readILEB128(i64, reader) },
+ EH.PE.sdata2 => .{ .signed = try reader.readInt(i16, endian) },
+ EH.PE.sdata4 => .{ .signed = try reader.readInt(i32, endian) },
+ EH.PE.sdata8 => .{ .signed = try reader.readInt(i64, endian) },
+ else => return badDwarf(),
+ },
+ .relative_to = enc & 0xf0,
+ .pc = pc
+ };
+}
+
+const CommonInformationEntry = struct {
+ length: u32,
+ id: u32,
+ version: u8,
+ code_alignment_factor: u64,
+ data_alignment_factor: u64,
+ return_address_register: u64,
+
+ // Augmented data
+ lsda_pointer_enc: ?u8,
+ personality_routine_pointer: ?EhPointer,
+ fde_pointer_enc: ?u8,
+
+ initial_instructions: []const u8,
+
+ // The returned struct references memory in `bytes`.
+ pub fn parse(bytes: []const u8, addr_size_bytes: u8, endian: std.builtin.Endian) !CommonInformationEntry {
+ if (addr_size_bytes > 8) return error.InvalidAddrSize;
+ if (bytes.len < 4) return badDwarf();
+ const length = mem.readInt(u32, bytes[0..4], endian);
+ const cie_bytes = bytes[4..][0..length];
+
+ var stream = io.fixedBufferStream(cie_bytes);
+ const reader = stream.reader();
+
+ const id = try reader.readInt(u32, endian);
+ if (id != 0) return badDwarf();
+
+ const version = try reader.readByte();
+ if (version != 1) return badDwarf();
+
+ var has_eh_data = false;
+ var has_aug_data = false;
+
+ var aug_str_len: usize = 0;
+ var aug_str_start = stream.pos;
+ var aug_byte = try reader.readByte();
+ while (aug_byte != 0) : (aug_byte = try reader.readByte()) {
+ switch (aug_byte) {
+ 'z' => {
+ if (aug_str_len != 0) return badDwarf();
+ has_aug_data = true;
+ aug_str_start = stream.pos;
+ },
+ 'e' => {
+ if (has_aug_data or aug_str_len != 0) return badDwarf();
+ if (try reader.readByte() != 'h') return badDwarf();
+ has_eh_data = true;
+ },
+ else => {
+ if (has_eh_data) return badDwarf();
+ aug_str_len += 1;
+ },
+ }
+ }
+
+ if (has_eh_data) {
+ // legacy data created by older versions of gcc - ignored here
+ for (0..addr_size_bytes) |_| _ = try reader.readByte();
+ }
+
+ const code_alignment_factor = try leb.readULEB128(u64, reader);
+ const data_alignment_factor = try leb.readULEB128(u64, reader);
+ const return_address_register = try leb.readULEB128(u64, reader);
+
+ var lsda_pointer_enc: ?u8 = null;
+ var personality_routine_pointer: ?EhPointer = null;
+ var fde_pointer_enc: ?u8 = null;
+
+ if (has_aug_data) {
+ const aug_data_len = try leb.readULEB128(usize, reader);
+ const aug_data_start = stream.pos;
+
+ const aug_str = cie_bytes[aug_str_start..][0..aug_str_len];
+ for (aug_str) |byte| {
+ switch (byte) {
+ 'L' => {
+ lsda_pointer_enc = try reader.readByte();
+ },
+ 'P' => {
+ const personality_enc = try reader.readByte();
+ personality_routine_pointer = try readEhPointer(
+ personality_enc,
+ @ptrToInt(&cie_bytes[stream.pos]),
+ addr_size_bytes,
+ endian,
+ reader,
+ );
+ },
+ 'R' => {
+ fde_pointer_enc = try reader.readByte();
+ },
+ else => return badDwarf(),
+ }
+ }
+
+ // verify length field
+ if (stream.pos != (aug_data_start + aug_data_len)) return badDwarf();
+ }
+
+ const initial_instructions = cie_bytes[stream.pos..];
+ return .{
+ .length = length,
+ .id = id,
+ .version = version,
+ .code_alignment_factor = code_alignment_factor,
+ .data_alignment_factor = data_alignment_factor,
+ .return_address_register = return_address_register,
+ .lsda_pointer_enc = lsda_pointer_enc,
+ .personality_routine_pointer = personality_routine_pointer,
+ .fde_pointer_enc = fde_pointer_enc,
+ .initial_instructions = initial_instructions,
+ };
+ }
+};