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macho: first working draft of externs on macOS

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This commit is contained in:
Jakub Konka 2021-01-06 17:45:26 +01:00
parent 6d2a6513f9
commit bb691ea16b
1 changed files with 27 additions and 5 deletions
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32
src/link/MachO.zig
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@ -408,6 +408,7 @@ pub fn flushModule(self: *MachO, comp: *Compilation) !void {
try self.writeLazyBindingInfoTable();
try self.writeExportTrie();
try self.writeAllGlobalAndUndefSymbols();
try self.writeIndirectSymbolTable();
try self.writeStringTable();
try self.updateLinkeditSegmentSizes();
@ -429,11 +430,6 @@ pub fn flushModule(self: *MachO, comp: *Compilation) !void {
.Lib => return error.TODOImplementWritingLibFiles,
}
{
const dysymtab = &self.load_commands.items[self.dysymtab_cmd_index.?].Dysymtab;
dysymtab.nindirectsyms = 0;
}
try self.writeLoadCommands();
try self.writeHeader();
@ -2534,6 +2530,32 @@ fn writeAllGlobalAndUndefSymbols(self: *MachO) !void {
self.load_commands_dirty = true;
}
fn writeIndirectSymbolTable(self: *MachO) !void {
const text_seg = &self.load_commands.items[self.text_segment_cmd_index.?].Segment;
const stubs = &text_seg.sections.items[self.stubs_section_index.?];
const dc_seg = &self.load_commands.items[self.data_const_segment_cmd_index.?].Segment;
const got = &dc_seg.sections.items[self.data_got_section_index.?];
const data_seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment;
const la = &data_seg.sections.items[self.la_symbol_ptr_section_index.?];
const dysymtab = &self.load_commands.items[self.dysymtab_cmd_index.?].Dysymtab;
dysymtab.nindirectsyms = 0;
for (self.undef_symbols.items) |sym, i| {
const idx = @intCast(u32, dysymtab.iundefsym + i);
var buf: [@sizeOf(u32)]u8 = undefined;
mem.writeIntLittle(u32, &buf, idx);
try self.base.file.?.pwriteAll(&buf, dysymtab.indirectsymoff + i * @sizeOf(u32));
dysymtab.nindirectsyms += 1;
if (i == self.dyld_stub_binder_index.?) {
got.reserved1 = @intCast(u32, i);
continue;
}
stubs.reserved1 = @intCast(u32, i);
try self.base.file.?.pwriteAll(&buf, dysymtab.indirectsymoff + (i + 1) * @sizeOf(u32));
la.reserved1 = @intCast(u32, i + 1);
dysymtab.nindirectsyms += 1;
}
}
fn writeCodeSignaturePadding(self: *MachO) !void {
const tracy = trace(@src());
defer tracy.end();