parent
f782202910
commit
281b2695c4
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@ -1550,6 +1550,8 @@ pub const Value = struct {
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},
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},
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.ptr => |ptr| switch (ptr.addr) {
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.ptr => |ptr| switch (ptr.addr) {
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.eu_payload, .opt_payload => |base| Value.fromInterned(base).canMutateComptimeVarState(mod),
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.eu_payload, .opt_payload => |base| Value.fromInterned(base).canMutateComptimeVarState(mod),
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.anon_decl => |anon_decl| Value.fromInterned(anon_decl.val).canMutateComptimeVarState(mod),
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.elem, .field => |base_index| Value.fromInterned(base_index.base).canMutateComptimeVarState(mod),
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else => false,
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else => false,
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},
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},
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.opt => |opt| switch (opt.val) {
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.opt => |opt| switch (opt.val) {
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@ -459,3 +459,77 @@ test "write empty array to end" {
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array[5..5].* = [_]u8{};
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array[5..5].* = [_]u8{};
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try testing.expectEqualStrings("hello", &array);
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try testing.expectEqualStrings("hello", &array);
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}
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}
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fn doublePtrTest() !void {
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var a: u32 = 0;
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const ptr = &a;
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const double_ptr = &ptr;
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setDoublePtr(double_ptr, 1);
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setDoublePtr(double_ptr, 2);
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setDoublePtr(double_ptr, 1);
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try std.testing.expect(a == 1);
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}
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fn setDoublePtr(ptr: *const *const u32, value: u32) void {
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setPtr(ptr.*, value);
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}
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fn setPtr(ptr: *const u32, value: u32) void {
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const mut_ptr: *u32 = @constCast(ptr);
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mut_ptr.* = value;
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}
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test "double pointer can mutate comptime state" {
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try comptime doublePtrTest();
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}
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fn GenericIntApplier(
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comptime Context: type,
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comptime applyFn: fn (context: Context, arg: u32) void,
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) type {
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return struct {
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context: Context,
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const Self = @This();
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inline fn any(self: *const Self) IntApplier {
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return .{
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.context = @ptrCast(&self.context),
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.applyFn = typeErasedApplyFn,
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};
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}
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fn typeErasedApplyFn(context: *const anyopaque, arg: u32) void {
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const ptr: *const Context = @alignCast(@ptrCast(context));
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applyFn(ptr.*, arg);
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}
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};
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}
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const IntApplier = struct {
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context: *const anyopaque,
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applyFn: *const fn (context: *const anyopaque, arg: u32) void,
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fn apply(ia: IntApplier, arg: u32) void {
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ia.applyFn(ia.context, arg);
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}
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};
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const Accumulator = struct {
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value: u32,
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const Applier = GenericIntApplier(*u32, add);
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fn applier(a: *Accumulator) Applier {
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return .{ .context = &a.value };
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}
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fn add(context: *u32, arg: u32) void {
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context.* += arg;
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}
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};
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fn fieldPtrTest() u32 {
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var a: Accumulator = .{ .value = 0 };
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const applier = a.applier();
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applier.any().apply(1);
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applier.any().apply(1);
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return a.value;
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}
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test "pointer in aggregate field can mutate comptime state" {
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try comptime std.testing.expect(fieldPtrTest() == 2);
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}
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