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zld: dedup symbols in the symbol table

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This commit is contained in:
Jakub Konka 2021-07-08 19:51:03 +02:00
parent 0cc4938419
commit bb5b82cab9
1 changed files with 16 additions and 17 deletions
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33
src/link/MachO/Zld.zig
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@ -2477,33 +2477,32 @@ fn writeSymbolTable(self: *Zld) !void {
var locals = std.ArrayList(macho.nlist_64).init(self.allocator);
defer locals.deinit();
try locals.ensureTotalCapacity(self.locals.items.len);
for (self.locals.items) |symbol| {
if (symbol.isTemp()) continue; // TODO when merging codepaths, this should go into freelist
const nlist = try symbol.asNlist(self, &self.strtab);
locals.appendAssumeCapacity(nlist);
}
var exports = std.ArrayList(macho.nlist_64).init(self.allocator);
defer exports.deinit();
for (self.locals.items) |symbol, i| {
if (i == 0) continue; // skip null symbol
if (symbol.isTemp()) continue; // TODO when merging codepaths, this should go into freelist
const reg = symbol.payload.regular;
const nlist = try symbol.asNlist(self, &self.strtab);
if (reg.linkage == .translation_unit) {
try locals.append(nlist);
} else {
try exports.append(nlist);
}
}
var undefs = std.ArrayList(macho.nlist_64).init(self.allocator);
defer undefs.deinit();
var undef_dir = std.StringHashMap(u32).init(self.allocator);
defer undef_dir.deinit();
for (self.globals.values()) |sym| {
for (self.imports.items) |sym| {
const nlist = try sym.asNlist(self, &self.strtab);
switch (sym.payload) {
.regular => try exports.append(nlist),
.proxy => {
const id = @intCast(u32, undefs.items.len);
try undefs.append(nlist);
try undef_dir.putNoClobber(sym.name, id);
},
else => unreachable,
}
const id = @intCast(u32, undefs.items.len);
try undefs.append(nlist);
try undef_dir.putNoClobber(sym.name, id);
}
const nlocals = locals.items.len;