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std.debug.MachOFile: handle 'path/to/archive.a(entry.o)' form

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Matthew Lugg 2025-11-19 14:33:42 +00:00
parent e1fa4011fb
commit 0f06b5b583
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1 changed files with 60 additions and 13 deletions
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73
lib/std/debug/MachOFile.zig
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@ -356,11 +356,58 @@ test {
_ = Symbol;
}
fn loadOFile(gpa: Allocator, o_file_path: []const u8) !OFile {
const mapped_mem = try mapDebugInfoFile(o_file_path);
errdefer posix.munmap(mapped_mem);
fn loadOFile(gpa: Allocator, o_file_name: []const u8) !OFile {
const all_mapped_memory, const mapped_ofile = map: {
const open_paren = paren: {
if (std.mem.endsWith(u8, o_file_name, ")")) {
if (std.mem.findScalarLast(u8, o_file_name, '(')) |i| {
break :paren i;
}
}
// Not an archive, just a normal path to a .o file
const m = try mapDebugInfoFile(o_file_name);
break :map .{ m, m };
};
var r: Io.Reader = .fixed(mapped_mem);
// We have the form 'path/to/archive.a(entry.o)'. Map the archive and find the object file in question.
const archive_path = o_file_name[0..open_paren];
const target_name_in_archive = o_file_name[open_paren + 1 .. o_file_name.len - 1];
const mapped_archive = try mapDebugInfoFile(archive_path);
errdefer posix.munmap(mapped_archive);
var ar_reader: Io.Reader = .fixed(mapped_archive);
const ar_magic = ar_reader.take(8) catch return error.InvalidMachO;
if (!std.mem.eql(u8, ar_magic, "!<arch>\n")) return error.InvalidMachO;
while (true) {
if (ar_reader.seek == ar_reader.buffer.len) return error.MissingDebugInfo;
const raw_name = ar_reader.takeArray(16) catch return error.InvalidMachO;
ar_reader.discardAll(12 + 6 + 6 + 8) catch return error.InvalidMachO;
const raw_size = ar_reader.takeArray(10) catch return error.InvalidMachO;
const file_magic = ar_reader.takeArray(2) catch return error.InvalidMachO;
if (!std.mem.eql(u8, file_magic, "`\n")) return error.InvalidMachO;
const size = std.fmt.parseInt(u32, mem.sliceTo(raw_size, ' '), 10) catch return error.InvalidMachO;
const raw_data = ar_reader.take(size) catch return error.InvalidMachO;
const entry_name: []const u8, const entry_contents: []const u8 = entry: {
if (!std.mem.startsWith(u8, raw_name, "#1/")) {
break :entry .{ mem.sliceTo(raw_name, '/'), raw_data };
}
const len = std.fmt.parseInt(u32, mem.sliceTo(raw_name[3..], ' '), 10) catch return error.InvalidMachO;
if (len > size) return error.InvalidMachO;
break :entry .{ mem.sliceTo(raw_data[0..len], 0), raw_data[len..] };
};
if (std.mem.eql(u8, entry_name, target_name_in_archive)) {
break :map .{ mapped_archive, entry_contents };
}
}
};
errdefer posix.munmap(all_mapped_memory);
var r: Io.Reader = .fixed(mapped_ofile);
const hdr = r.takeStruct(macho.mach_header_64, .little) catch |err| switch (err) {
error.ReadFailed => unreachable,
error.EndOfStream => return error.InvalidMachO,
@ -370,7 +417,7 @@ fn loadOFile(gpa: Allocator, o_file_path: []const u8) !OFile {
const seg_cmd: macho.LoadCommandIterator.LoadCommand, const symtab_cmd: macho.symtab_command = cmds: {
var seg_cmd: ?macho.LoadCommandIterator.LoadCommand = null;
var symtab_cmd: ?macho.symtab_command = null;
var it: macho.LoadCommandIterator = try .init(&hdr, mapped_mem[@sizeOf(macho.mach_header_64)..]);
var it: macho.LoadCommandIterator = try .init(&hdr, mapped_ofile[@sizeOf(macho.mach_header_64)..]);
while (try it.next()) |lc| switch (lc.hdr.cmd) {
.SEGMENT_64 => seg_cmd = lc,
.SYMTAB => symtab_cmd = lc.cast(macho.symtab_command) orelse return error.InvalidMachO,
@ -382,13 +429,13 @@ fn loadOFile(gpa: Allocator, o_file_path: []const u8) !OFile {
};
};
if (mapped_mem.len < symtab_cmd.stroff + symtab_cmd.strsize) return error.InvalidMachO;
if (mapped_mem[symtab_cmd.stroff + symtab_cmd.strsize - 1] != 0) return error.InvalidMachO;
const strtab = mapped_mem[symtab_cmd.stroff..][0 .. symtab_cmd.strsize - 1];
if (mapped_ofile.len < symtab_cmd.stroff + symtab_cmd.strsize) return error.InvalidMachO;
if (mapped_ofile[symtab_cmd.stroff + symtab_cmd.strsize - 1] != 0) return error.InvalidMachO;
const strtab = mapped_ofile[symtab_cmd.stroff..][0 .. symtab_cmd.strsize - 1];
const n_sym_bytes = symtab_cmd.nsyms * @sizeOf(macho.nlist_64);
if (mapped_mem.len < symtab_cmd.symoff + n_sym_bytes) return error.InvalidMachO;
const symtab_raw: []align(1) const macho.nlist_64 = @ptrCast(mapped_mem[symtab_cmd.symoff..][0..n_sym_bytes]);
if (mapped_ofile.len < symtab_cmd.symoff + n_sym_bytes) return error.InvalidMachO;
const symtab_raw: []align(1) const macho.nlist_64 = @ptrCast(mapped_ofile[symtab_cmd.symoff..][0..n_sym_bytes]);
// TODO handle tentative (common) symbols
var symbols_by_name: std.ArrayHashMapUnmanaged(u32, void, void, true) = .empty;
@ -423,8 +470,8 @@ fn loadOFile(gpa: Allocator, o_file_path: []const u8) !OFile {
if (mem.eql(u8, "__" ++ section.name, sect.sectName())) break i;
} else continue;
if (mapped_mem.len < sect.offset + sect.size) return error.InvalidMachO;
const section_bytes = mapped_mem[sect.offset..][0..sect.size];
if (mapped_ofile.len < sect.offset + sect.size) return error.InvalidMachO;
const section_bytes = mapped_ofile[sect.offset..][0..sect.size];
sections[section_index] = .{
.data = section_bytes,
.owned = false,
@ -455,7 +502,7 @@ fn loadOFile(gpa: Allocator, o_file_path: []const u8) !OFile {
};
return .{
.mapped_memory = mapped_mem,
.mapped_memory = all_mapped_memory,
.dwarf = dwarf,
.strtab = strtab,
.symtab_raw = symtab_raw,