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fix: prevent arena memory leakage in diff.zig

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This commit is contained in:
CJ van den Berg 2024-10-02 20:15:40 +02:00
parent 9080fd4826
commit 07fdf30e9f
Signed by: neurocyte
GPG key ID: 8EB1E1BB660E3FB9
1 changed files with 14 additions and 23 deletions
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37
src/diff.zig
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@ -30,21 +30,17 @@ pub fn deinit(self: *Self) void {
}
const Process = struct {
arena: std.heap.ArenaAllocator,
allocator: std.mem.Allocator,
receiver: Receiver,
const Receiver = tp.Receiver(*Process);
const outer_a = std.heap.page_allocator;
const allocator = std.heap.c_allocator;
pub fn create() !tp.pid {
const self = try outer_a.create(Process);
const self = try allocator.create(Process);
self.* = .{
.arena = std.heap.ArenaAllocator.init(outer_a),
.allocator = self.arena.allocator(),
.receiver = Receiver.init(Process.receive, self),
};
return tp.spawn_link(self.allocator, self, Process.start, module_name);
return tp.spawn_link(allocator, self, Process.start, module_name);
}
fn start(self: *Process) tp.result {
@ -53,8 +49,7 @@ const Process = struct {
}
fn deinit(self: *Process) void {
self.arena.deinit();
outer_a.destroy(self);
allocator.destroy(self);
}
fn receive(self: *Process, from: tp.pid_ref, m: tp.message) tp.result {
@ -66,12 +61,15 @@ const Process = struct {
var eol_mode: Buffer.EolModeTag = @intFromEnum(Buffer.EolMode.lf);
return if (try m.match(.{ "D", tp.extract(&cb), tp.extract(&root_dst), tp.extract(&root_src), tp.extract(&eol_mode) }))
self.diff(from, cb, root_dst, root_src, @enumFromInt(eol_mode)) catch |e| tp.exit_error(e, @errorReturnTrace())
do_diff(from, cb, root_dst, root_src, @enumFromInt(eol_mode)) catch |e| tp.exit_error(e, @errorReturnTrace())
else if (try m.match(.{"shutdown"}))
tp.exit_normal();
}
fn diff(self: *Process, from: tp.pid_ref, cb_addr: usize, root_new_addr: usize, root_old_addr: usize, eol_mode: Buffer.EolMode) !void {
fn do_diff(from: tp.pid_ref, cb_addr: usize, root_new_addr: usize, root_old_addr: usize, eol_mode: Buffer.EolMode) !void {
var arena = std.heap.ArenaAllocator.init(allocator);
defer arena.deinit();
const a = arena.allocator();
const frame = tracy.initZone(@src(), .{ .name = "diff" });
defer frame.deinit();
const cb: *CallBack = if (cb_addr == 0) return else @ptrFromInt(cb_addr);
@ -79,26 +77,19 @@ const Process = struct {
const root_src: Buffer.Root = if (root_old_addr == 0) return else @ptrFromInt(root_old_addr);
var dizzy_edits = std.ArrayListUnmanaged(dizzy.Edit){};
var dst = std.ArrayList(u8).init(self.allocator);
var src = std.ArrayList(u8).init(self.allocator);
var dst = std.ArrayList(u8).init(a);
var src = std.ArrayList(u8).init(a);
var scratch = std.ArrayListUnmanaged(u32){};
var edits = std.ArrayList(Edit).init(self.allocator);
defer {
dst.deinit();
src.deinit();
scratch.deinit(self.allocator);
dizzy_edits.deinit(self.allocator);
}
var edits = std.ArrayList(Edit).init(a);
try root_dst.store(dst.writer(), eol_mode);
try root_src.store(src.writer(), eol_mode);
const scratch_len = 4 * (dst.items.len + src.items.len) + 2;
try scratch.ensureTotalCapacity(self.allocator, scratch_len);
try scratch.ensureTotalCapacity(a, scratch_len);
scratch.items.len = scratch_len;
try dizzy.PrimitiveSliceDiffer(u8).diff(self.allocator, &dizzy_edits, src.items, dst.items, scratch.items);
try dizzy.PrimitiveSliceDiffer(u8).diff(a, &dizzy_edits, src.items, dst.items, scratch.items);
if (dizzy_edits.items.len > 2)
try edits.ensureTotalCapacity((dizzy_edits.items.len - 1) / 2);