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lld: parse output lld file

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This commit is contained in:
Jakub Konka 2020-11-28 10:50:15 +01:00
parent 02e12ede46
commit e8ffae60a2
1 changed files with 33 additions and 0 deletions
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33
src/link/MachO.zig
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@ -23,6 +23,7 @@ const target_util = @import("../target.zig");
const Trie = @import("MachO/Trie.zig");
const CodeSignature = @import("MachO/CodeSignature.zig");
const Parser = @import("MachO/Parser.zig");
pub const base_tag: File.Tag = File.Tag.macho;
@ -801,6 +802,38 @@ fn linkWithLLD(self: *MachO, comp: *Compilation) !void {
if (stderr_context.data.items.len != 0) {
std.log.warn("unexpected LLD stderr: {}", .{stderr_context.data.items});
}
// At this stage, LLD has done its job. It is time to patch the resultant
// binaries up!
var parser = Parser.init(self.base.allocator);
defer parser.deinit();
const out_file = try directory.handle.openFile(full_out_path, .{});
try parser.parseFile(out_file);
out_file.close();
var end_pos: ?usize = null;
var text_fileoff: ?usize = null;
var text_filesize: ?usize = null;
for (parser.load_commands.items) |cmd| {
switch (cmd.cmd()) {
macho.LC_SYMTAB => switch (cmd) {
.Symtab => |x| {
end_pos = x.stroff + x.strsize;
},
else => unreachable,
},
macho.LC_SEGMENT_64 => switch (cmd) {
.Segment => |x| {
if (!mem.eql(u8, x.inner.segname[0..6], "__TEXT")) continue;
text_fileoff = x.inner.fileoff;
text_filesize = x.inner.filesize;
},
else => unreachable,
},
else => {},
}
}
// Pad out space for code signature
std.debug.print("end_pos={},text_fileoff={},text_filesize={}\n", .{ end_pos, text_fileoff, text_filesize });
}
}