macos stack traces: read debug info sections from .o files
parent
5c1ec20c9a
commit
3173c90f14
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@ -62,6 +62,7 @@ fn wantTtyColor() bool {
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}
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/// Tries to print the current stack trace to stderr, unbuffered, and ignores any error returned.
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/// TODO multithreaded awareness
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pub fn dumpCurrentStackTrace(start_addr: ?usize) void {
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const stderr = getStderrStream() catch return;
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const debug_info = getSelfDebugInfo() catch |err| {
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@ -75,6 +76,7 @@ pub fn dumpCurrentStackTrace(start_addr: ?usize) void {
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}
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/// Tries to print a stack trace to stderr, unbuffered, and ignores any error returned.
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/// TODO multithreaded awareness
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pub fn dumpStackTrace(stack_trace: *const builtin.StackTrace) void {
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const stderr = getStderrStream() catch return;
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const debug_info = getSelfDebugInfo() catch |err| {
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@ -460,6 +462,7 @@ fn openSelfDebugInfoMacOs(allocator: *mem.Allocator) !DebugInfo {
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std.sort.sort(MachoSymbol, symbols, MachoSymbol.addressLessThan);
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return DebugInfo{
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.ofiles = DebugInfo.OFileTable.init(allocator),
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.symbols = symbols,
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.strings = strings,
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};
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@ -511,10 +514,22 @@ const MachoSymbol = struct {
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}
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};
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const MachOFile = struct {
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bytes: []align(@alignOf(std.c.mach_header_64)) const u8,
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};
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pub const DebugInfo = switch (builtin.os) {
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builtin.Os.macosx => struct {
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symbols: []const MachoSymbol,
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strings: []const u8,
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ofiles: OFileTable,
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const OFileTable = std.HashMap(
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*std.c.nlist_64,
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MachOFile,
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std.hash_map.getHashPtrAddrFn(*std.c.nlist_64),
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std.hash_map.getTrivialEqlFn(*std.c.nlist_64),
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);
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},
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else => struct {
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self_exe_file: os.File,
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@ -940,6 +955,44 @@ fn parseDie(st: *DebugInfo, abbrev_table: *const AbbrevTable, is_64: bool) !Die
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}
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fn getLineNumberInfoMacOs(di: *DebugInfo, symbol: MachoSymbol, target_address: usize) !LineInfo {
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const ofile = symbol.ofile orelse return error.MissingDebugInfo;
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const gop = try di.ofiles.getOrPut(ofile);
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const mach_o_file = if (gop.found_existing) &gop.kv.value else blk: {
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errdefer _ = di.ofiles.remove(ofile);
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const ofile_path = mem.toSliceConst(u8, di.strings.ptr + ofile.n_strx);
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std.debug.warn("reading .o file: {}\n", ofile_path);
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gop.kv.value = MachOFile{
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.bytes = try std.io.readFileAllocAligned(di.ofiles.allocator, ofile_path, @alignOf(std.c.mach_header_64)),
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};
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const hdr = @ptrCast(*const std.c.mach_header_64, gop.kv.value.bytes.ptr);
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assert(hdr.magic == std.c.MH_MAGIC_64);
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const hdr_base = @ptrCast([*]const u8, hdr);
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var ptr = hdr_base + @sizeOf(std.c.mach_header_64);
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var ncmd: u32 = hdr.ncmds;
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const segcmd = while (ncmd != 0) : (ncmd -= 1) {
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const lc = @ptrCast(*const std.c.load_command, ptr);
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switch (lc.cmd) {
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std.c.LC_SEGMENT_64 => break @ptrCast(*const std.c.segment_command_64, ptr),
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else => {},
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}
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ptr += lc.cmdsize; // TODO https://github.com/ziglang/zig/issues/1403
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} else {
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return error.MissingDebugInfo;
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};
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const sections = @ptrCast([*]const std.c.section_64, ptr + @sizeOf(std.c.segment_command_64))[0..segcmd.nsects];
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for (sections) |sect| {
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if (sect.flags & std.c.SECTION_TYPE == std.c.S_REGULAR and
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(sect.flags & std.c.SECTION_ATTRIBUTES) & std.c.S_ATTR_DEBUG == std.c.S_ATTR_DEBUG) {
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const sect_name = mem.toSliceConst(u8, §.sectname);
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std.debug.warn("sect: {}\n", sect_name);
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}
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}
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break :blk &gop.kv.value;
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};
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return error.MissingDebugInfo;
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}
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@ -408,6 +408,22 @@ test "iterator hash map" {
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assert(entry.value == values[0]);
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}
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pub fn getHashPtrAddrFn(comptime K: type) (fn (K) u32) {
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return struct {
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fn hash(key: K) u32 {
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return getAutoHashFn(usize)(@ptrToInt(key));
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}
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}.hash;
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}
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pub fn getTrivialEqlFn(comptime K: type) (fn (K, K) bool) {
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return struct {
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fn eql(a: K, b: K) bool {
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return a == b;
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}
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}.eql;
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}
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pub fn getAutoHashFn(comptime K: type) (fn (K) u32) {
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return struct {
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fn hash(key: K) u32 {
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@ -24,6 +24,7 @@ pub const empty_import = @import("empty.zig");
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pub const event = @import("event.zig");
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pub const fmt = @import("fmt/index.zig");
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pub const hash = @import("hash/index.zig");
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pub const hash_map = @import("hash_map.zig");
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pub const heap = @import("heap.zig");
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pub const io = @import("io.zig");
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pub const json = @import("json.zig");
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