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macho: write adjacent atoms to in-memory buffer

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and then commit the large buffer into file.
This commit is contained in:
Jakub Konka 2021-09-10 15:37:51 +02:00
parent aaacfc0d0a
commit 8e5f7f5fe8
1 changed files with 44 additions and 4 deletions
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48
src/link/MachO.zig
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@ -1766,20 +1766,60 @@ fn allocateGlobalSymbols(self: *MachO) !void {
}
fn writeAtoms(self: *MachO) !void {
var buffer = std.ArrayList(u8).init(self.base.allocator);
defer buffer.deinit();
var file_offset: ?u64 = null;
var it = self.blocks.iterator();
while (it.next()) |entry| {
const match = entry.key_ptr.*;
const seg = self.load_commands.items[match.seg].Segment;
const sect = seg.sections.items[match.sect];
var atom: *TextBlock = entry.value_ptr.*;
while (atom.prev) |prev| {
atom = prev;
}
while (true) {
if (atom.dirty) {
try self.writeAtom(atom, match);
const atom_sym = self.locals.items[atom.local_sym_index];
const padding_size: u64 = if (atom.next) |next| blk: {
const next_sym = self.locals.items[next.local_sym_index];
break :blk next_sym.n_value - (atom_sym.n_value + atom.size);
} else 0;
try atom.resolveRelocs(self);
try buffer.appendSlice(atom.code.items);
try buffer.ensureUnusedCapacity(padding_size);
var i: usize = 0;
while (i < padding_size) : (i += 1) {
buffer.appendAssumeCapacity(0);
}
if (file_offset == null) {
file_offset = sect.offset + atom_sym.n_value - sect.addr;
}
atom.dirty = false;
} else {
if (file_offset) |off| {
try self.base.file.?.pwriteAll(buffer.items, off);
}
file_offset = null;
buffer.clearRetainingCapacity();
}
if (atom.prev) |prev| {
atom = prev;
} else break;
if (atom.next) |next| {
atom = next;
} else {
if (file_offset) |off| {
try self.base.file.?.pwriteAll(buffer.items, off);
}
file_offset = null;
buffer.clearRetainingCapacity();
break;
}
}
}
}