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macho: fix logic for updating exports in incremental codepath

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This commit is contained in:
Jakub Konka 2021-09-13 22:11:20 +02:00
parent 4c36da1047
commit 46a10401f0
1 changed files with 44 additions and 29 deletions
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73
src/link/MachO.zig
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@ -848,6 +848,22 @@ pub fn flush(self: *MachO, comp: *Compilation) !void {
try self.allocateGlobalSymbols();
try self.writeAtoms();
// log.warn("Locals:", .{});
// for (self.locals.items) |sym, i| {
// log.warn(" => {d}: {s}, {}", .{ i, self.getString(sym.n_strx), sym });
// }
// log.warn("Globals:", .{});
// for (self.globals.items) |sym, i| {
// log.warn(" => {d}: {s} {}", .{ i, self.getString(sym.n_strx), sym });
// }
// {
// log.warn("Resolver:", .{});
// var it = self.symbol_resolver.iterator();
// while (it.next()) |entry| {
// log.warn(" => {s}: {}", .{ self.getString(entry.key_ptr.*), entry.value_ptr.* });
// }
// }
if (self.bss_section_index) |idx| {
const seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment;
const sect = &seg.sections.items[idx];
@ -1751,6 +1767,7 @@ fn allocateGlobalSymbols(self: *MachO) !void {
const sym = &self.globals.items[resolv.where_index];
sym.n_value = local_sym.n_value;
sym.n_sect = local_sym.n_sect;
log.debug("allocating global symbol {s} at 0x{x}", .{ self.getString(sym.n_strx), local_sym.n_value });
}
}
@ -2941,6 +2958,8 @@ fn freeAtom(self: *MachO, atom: *Atom, match: MatchingSection) void {
if (atom.prev) |prev| {
// TODO shrink the section size here
last_atom.* = prev;
} else {
_ = self.atoms.fetchRemove(match);
}
}
}
@ -3360,44 +3379,40 @@ pub fn updateDeclExports(
},
}
if (exp.link.macho.sym_index) |i| {
const sym = &self.globals.items[i];
sym.* = .{
.n_strx = sym.n_strx,
.n_type = n_type,
.n_sect = @intCast(u8, self.text_section_index.?) + 1,
.n_desc = n_desc,
.n_value = decl_sym.n_value,
};
} else {
const name_str_index = try self.makeString(exp_name);
const i = if (self.globals_free_list.popOrNull()) |i| i else blk: {
const global_sym_index = if (exp.link.macho.sym_index) |i| i else blk: {
const i = if (self.globals_free_list.popOrNull()) |i| i else inner: {
_ = self.globals.addOneAssumeCapacity();
break :blk @intCast(u32, self.globals.items.len - 1);
};
self.globals.items[i] = .{
.n_strx = name_str_index,
.n_type = n_type,
.n_sect = @intCast(u8, self.text_section_index.?) + 1,
.n_desc = n_desc,
.n_value = decl_sym.n_value,
};
const resolv = try self.symbol_resolver.getOrPut(self.base.allocator, name_str_index);
resolv.value_ptr.* = .{
.where = .global,
.where_index = i,
.local_sym_index = decl.link.macho.local_sym_index,
break :inner @intCast(u32, self.globals.items.len - 1);
};
break :blk i;
};
exp.link.macho.sym_index = @intCast(u32, i);
}
const n_strx = try self.makeString(exp_name);
const sym = &self.globals.items[global_sym_index];
sym.* = .{
.n_strx = try self.makeString(exp_name),
.n_type = n_type,
.n_sect = @intCast(u8, self.text_section_index.?) + 1,
.n_desc = n_desc,
.n_value = decl_sym.n_value,
};
exp.link.macho.sym_index = global_sym_index;
const resolv = try self.symbol_resolver.getOrPut(self.base.allocator, n_strx);
resolv.value_ptr.* = .{
.where = .global,
.where_index = global_sym_index,
.local_sym_index = decl.link.macho.local_sym_index,
};
}
}
pub fn deleteExport(self: *MachO, exp: Export) void {
const sym_index = exp.sym_index orelse return;
self.globals_free_list.append(self.base.allocator, sym_index) catch {};
self.globals.items[sym_index].n_type = 0;
const global = &self.globals.items[sym_index];
global.n_type = 0;
assert(self.symbol_resolver.remove(global.n_strx));
}
pub fn freeDecl(self: *MachO, decl: *Module.Decl) void {