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macho: implement growSection mechanism

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This commit is contained in:
Jakub Konka 2024-01-18 16:52:41 +01:00
parent 2169a5559d
commit 6cd4c7612f
1 changed files with 53 additions and 3 deletions
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56
src/link/MachO.zig
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@ -3130,6 +3130,16 @@ fn allocatedSize(self: *MachO, start: u64) u64 {
return min_pos - start;
}
fn allocatedVirtualSize(self: *MachO, start: u64) u64 {
if (start == 0) return 0;
var min_pos: u64 = std.math.maxInt(u64);
for (self.segments.items) |seg| {
if (seg.vmaddr <= start) continue;
if (seg.vmaddr < min_pos) min_pos = seg.vmaddr;
}
return min_pos - start;
}
fn findFreeSpace(self: *MachO, object_size: u64, min_alignment: u32) u64 {
var start: u64 = 0;
while (self.detectAllocCollision(start, object_size)) |item_end| {
@ -3261,10 +3271,50 @@ fn initMetadata(self: *MachO, options: InitMetadataOptions) !void {
}
}
pub fn growSection(self: *MachO, sect_index: u8, size: u64) !void {
pub fn growSection(self: *MachO, sect_index: u8, needed_size: u64) !void {
const sect = &self.sections.items(.header)[sect_index];
std.debug.print("curr={x}, needed={x}\n", .{ sect.size, size });
@panic("TODO growSection");
const seg_id = self.sections.items(.segment_id)[sect_index];
const seg = &self.segments.items[seg_id];
if (needed_size > self.allocatedSize(sect.offset) and !sect.isZerofill()) {
const existing_size = sect.size;
sect.size = 0;
// Must move the entire section.
const new_offset = self.findFreeSpace(needed_size, self.getPageSize());
log.debug("new '{s},{s}' file offset 0x{x} to 0x{x}", .{
sect.segName(),
sect.sectName(),
new_offset,
new_offset + existing_size,
});
const amt = try self.base.file.?.copyRangeAll(sect.offset, self.base.file.?, new_offset, existing_size);
// TODO figure out what to about this error condition - how to communicate it up.
if (amt != existing_size) return error.InputOutput;
sect.offset = @intCast(new_offset);
seg.fileoff = new_offset;
}
sect.size = needed_size;
if (!sect.isZerofill()) {
seg.filesize = needed_size;
}
const mem_capacity = self.allocatedVirtualSize(seg.vmaddr);
if (needed_size > mem_capacity) {
var err = try self.addErrorWithNotes(2);
try err.addMsg(self, "fatal linker error: cannot expand segment seg({d})({s}) in virtual memory", .{
seg_id,
seg.segName(),
});
try err.addNote(self, "TODO: emit relocations to memory locations in self-hosted backends", .{});
try err.addNote(self, "as a workaround, try increasing pre-allocated virtual memory of each segment", .{});
}
seg.vmsize = needed_size;
}
pub fn getTarget(self: MachO) std.Target {