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macho: populate stubs and stub_helper

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This commit is contained in:
Jakub Konka
2021-01-06 01:13:25 +01:00
parent 51a13f8ea6
commit f44732c1b0
2 changed files with 96 additions and 6 deletions
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22
src/codegen.zig
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@@ -1859,8 +1859,26 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
},
else => unreachable, // unsupported architecture on MachO
}
} else if (func_value.castTag(.extern_fn)) |_| {
return self.fail(inst.base.src, "TODO implement calling extern functions", .{});
} else if (func_value.castTag(.extern_fn)) |func_payload| {
const decl = func_payload.data;
const decl_name = try std.fmt.allocPrint(self.bin_file.allocator, "_{s}", .{decl.name});
defer self.bin_file.allocator.free(decl_name);
const name = try macho_file.makeString(decl_name);
const symbol = macho_file.undef_symbols.items.len;
try macho_file.undef_symbols.append(self.bin_file.allocator, .{
.n_strx = name,
.n_type = std.macho.N_UNDF | std.macho.N_EXT,
.n_sect = 0,
.n_desc = std.macho.REFERENCE_FLAG_UNDEFINED_NON_LAZY | std.macho.N_SYMBOL_RESOLVER,
.n_value = 0,
});
try macho_file.stub_fixups.append(self.bin_file.allocator, .{
.symbol = symbol,
.start = self.code.items.len,
.len = 4,
});
// We mark the space and fix it up later.
writeInt(u32, try self.code.addManyAsArray(4), 0);
} else {
return self.fail(inst.base.src, "TODO implement calling bitcasted functions", .{});
}