motiejus/zig
1
Fork 0
Code Releases Activity

macho: write out stubs for new externs only

Browse Source
This commit is contained in:
Jakub Konka
2021-01-08 22:26:18 +01:00
parent 2f7cd71193
commit 44a052a65f
2 changed files with 64 additions and 51 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
src/codegen.zig
View File

@@ -1862,18 +1862,28 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
} 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,
});
const exists: bool = macho_file.externs.contains(decl_name);
const symbol: u32 = blk: {
if (macho_file.externs.get(decl_name)) |index| {
self.bin_file.allocator.free(decl_name);
break :blk index;
} else {
const extern_index = @intCast(u32, macho_file.undef_symbols.items.len - 1); // TODO
try macho_file.externs.putNoClobber(self.bin_file.allocator, decl_name, extern_index);
const name = try macho_file.makeString(decl_name);
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,
});
break :blk extern_index;
}
};
try macho_file.stub_fixups.append(self.bin_file.allocator, .{
.symbol = symbol,
.exists = exists,
.start = self.code.items.len,
.len = 4,
});