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zld: naively handle static initializers in C++

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This commit is contained in:
Jakub Konka 2021-03-21 22:33:32 +01:00
parent dce612ac2b
commit 3b48ea874e
1 changed files with 96 additions and 2 deletions
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98
src/link/MachO/Zld.zig
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@ -60,13 +60,17 @@ stub_helper_section_index: ?u16 = null,
text_const_section_index: ?u16 = null,
cstring_section_index: ?u16 = null,
// __DATA segment sections
// __DATA_CONST segment sections
got_section_index: ?u16 = null,
mod_init_func_section_index: ?u16 = null,
mod_term_func_section_index: ?u16 = null,
data_const_section_index: ?u16 = null,
// __DATA segment sections
tlv_section_index: ?u16 = null,
tlv_data_section_index: ?u16 = null,
tlv_bss_section_index: ?u16 = null,
la_symbol_ptr_section_index: ?u16 = null,
data_const_section_index: ?u16 = null,
data_section_index: ?u16 = null,
bss_section_index: ?u16 = null,
@ -448,6 +452,46 @@ fn updateMetadata(self: *Zld, object_id: u16) !void {
.reserved3 = 0,
});
},
macho.S_MOD_INIT_FUNC_POINTERS => {
if (!mem.eql(u8, segname, "__DATA")) continue;
if (self.mod_init_func_section_index != null) continue;
self.mod_init_func_section_index = @intCast(u16, data_const_seg.sections.items.len);
try data_const_seg.addSection(self.allocator, .{
.sectname = makeStaticString("__mod_init_func"),
.segname = makeStaticString("__DATA_CONST"),
.addr = 0,
.size = 0,
.offset = 0,
.@"align" = 0,
.reloff = 0,
.nreloc = 0,
.flags = macho.S_MOD_INIT_FUNC_POINTERS,
.reserved1 = 0,
.reserved2 = 0,
.reserved3 = 0,
});
},
macho.S_MOD_TERM_FUNC_POINTERS => {
if (!mem.eql(u8, segname, "__DATA")) continue;
if (self.mod_term_func_section_index != null) continue;
self.mod_term_func_section_index = @intCast(u16, data_const_seg.sections.items.len);
try data_const_seg.addSection(self.allocator, .{
.sectname = makeStaticString("__mod_term_func"),
.segname = makeStaticString("__DATA_CONST"),
.addr = 0,
.size = 0,
.offset = 0,
.@"align" = 0,
.reloff = 0,
.nreloc = 0,
.flags = macho.S_MOD_TERM_FUNC_POINTERS,
.reserved1 = 0,
.reserved2 = 0,
.reserved3 = 0,
});
},
macho.S_ZEROFILL => {
if (!mem.eql(u8, segname, "__DATA")) continue;
if (self.bss_section_index != null) continue;
@ -583,6 +627,18 @@ fn getMatchingSection(self: *Zld, section: macho.section_64) ?MatchingSection {
.sect = self.cstring_section_index.?,
};
},
macho.S_MOD_INIT_FUNC_POINTERS => {
break :blk .{
.seg = self.data_const_segment_cmd_index.?,
.sect = self.mod_init_func_section_index.?,
};
},
macho.S_MOD_TERM_FUNC_POINTERS => {
break :blk .{
.seg = self.data_const_segment_cmd_index.?,
.sect = self.mod_term_func_section_index.?,
};
},
macho.S_ZEROFILL => {
break :blk .{
.seg = self.data_segment_cmd_index.?,
@ -684,6 +740,8 @@ fn sortSections(self: *Zld) !void {
const indices = &[_]*?u16{
&self.got_section_index,
&self.mod_init_func_section_index,
&self.mod_term_func_section_index,
&self.data_const_section_index,
};
for (indices) |maybe_index| {
@ -2471,6 +2529,42 @@ fn writeRebaseInfoTable(self: *Zld) !void {
}
}
if (self.mod_init_func_section_index) |idx| {
// TODO audit and investigate this.
const seg = self.load_commands.items[self.data_const_segment_cmd_index.?].Segment;
const sect = seg.sections.items[idx];
const npointers = sect.size * @sizeOf(u64);
const base_offset = sect.addr - seg.inner.vmaddr;
const segment_id = @intCast(u16, self.data_const_segment_cmd_index.?);
try pointers.ensureCapacity(pointers.items.len + npointers);
var i: usize = 0;
while (i < npointers) : (i += 1) {
pointers.appendAssumeCapacity(.{
.offset = base_offset + i * @sizeOf(u64),
.segment_id = segment_id,
});
}
}
if (self.mod_term_func_section_index) |idx| {
// TODO audit and investigate this.
const seg = self.load_commands.items[self.data_const_segment_cmd_index.?].Segment;
const sect = seg.sections.items[idx];
const npointers = sect.size * @sizeOf(u64);
const base_offset = sect.addr - seg.inner.vmaddr;
const segment_id = @intCast(u16, self.data_const_segment_cmd_index.?);
try pointers.ensureCapacity(pointers.items.len + npointers);
var i: usize = 0;
while (i < npointers) : (i += 1) {
pointers.appendAssumeCapacity(.{
.offset = base_offset + i * @sizeOf(u64),
.segment_id = segment_id,
});
}
}
if (self.la_symbol_ptr_section_index) |idx| {
try pointers.ensureCapacity(pointers.items.len + self.lazy_imports.items().len);
const seg = self.load_commands.items[self.data_segment_cmd_index.?].Segment;