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const std = @import("std");
const builtin = @import("builtin");
const expect = std.testing.expect;
test "@memset on array pointers" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
try testMemsetArray();
try comptime testMemsetArray();
}
fn testMemsetArray() !void {
{
// memset array to non-undefined, ABI size == 1
var foo: [20]u8 = undefined;
@memset(&foo, 'A');
try expect(foo[0] == 'A');
try expect(foo[11] == 'A');
try expect(foo[19] == 'A');
}
{
// memset array to non-undefined, ABI size > 1
var foo: [20]u32 = undefined;
@memset(&foo, 1234);
try expect(foo[0] == 1234);
try expect(foo[11] == 1234);
try expect(foo[19] == 1234);
}
}
test "@memset on slices" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
try testMemsetSlice();
try comptime testMemsetSlice();
}
fn testMemsetSlice() !void {
{
// memset slice to non-undefined, ABI size == 1
var array: [20]u8 = undefined;
var len = array.len;
_ = &len;
const slice = array[0..len];
@memset(slice, 'A');
try expect(slice[0] == 'A');
try expect(slice[11] == 'A');
try expect(slice[19] == 'A');
}
{
// memset slice to non-undefined, ABI size > 1
var array: [20]u32 = undefined;
var len = array.len;
_ = &len;
const slice = array[0..len];
@memset(slice, 1234);
try expect(slice[0] == 1234);
try expect(slice[11] == 1234);
try expect(slice[19] == 1234);
}
}
test "memset with bool element" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
var buf: [5]bool = undefined;
@memset(&buf, true);
try expect(buf[2]);
try expect(buf[4]);
}
test "memset with 1-byte struct element" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest;
const S = struct { x: bool };
var buf: [5]S = undefined;
@memset(&buf, .{ .x = true });
try expect(buf[2].x);
try expect(buf[4].x);
}
test "memset with 1-byte array element" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest;
const A = [1]bool;
var buf: [5]A = undefined;
@memset(&buf, .{true});
try expect(buf[2][0]);
try expect(buf[4][0]);
}
test "memset with large array element, runtime known" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
const A = [128]u64;
var buf: [5]A = undefined;
var runtime_known_element = [_]u64{0} ** 128;
_ = &runtime_known_element;
@memset(&buf, runtime_known_element);
for (buf[0]) |elem| try expect(elem == 0);
for (buf[1]) |elem| try expect(elem == 0);
for (buf[2]) |elem| try expect(elem == 0);
for (buf[3]) |elem| try expect(elem == 0);
for (buf[4]) |elem| try expect(elem == 0);
}
test "memset with large array element, comptime known" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
const A = [128]u64;
var buf: [5]A = undefined;
const comptime_known_element = [_]u64{0} ** 128;
@memset(&buf, comptime_known_element);
for (buf[0]) |elem| try expect(elem == 0);
for (buf[1]) |elem| try expect(elem == 0);
for (buf[2]) |elem| try expect(elem == 0);
for (buf[3]) |elem| try expect(elem == 0);
for (buf[4]) |elem| try expect(elem == 0);
}
test "@memset provides result type" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
const S = struct { x: u32 };
var buf1: [5]S = undefined;
@memset(&buf1, .{ .x = @intCast(12) });
var buf2: [5]S = undefined;
@memset(@as([]S, &buf2), .{ .x = @intCast(34) });
for (buf1) |s| try expect(s.x == 12);
for (buf2) |s| try expect(s.x == 34);
}
test "zero keys with @memset" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
const Keys = struct {
up: bool,
down: bool,
left: bool,
right: bool,
var keys: @This() = undefined;
};
@memset(@as([*]u8, @ptrCast(&Keys.keys))[0..@sizeOf(@TypeOf(Keys.keys))], 0);
try expect(!Keys.keys.up);
try expect(!Keys.keys.down);
try expect(!Keys.keys.left);
try expect(!Keys.keys.right);
}
test "@memset with zero-length array" {
var array: [0]usize = undefined;
@memset(&array, 0);
}
test "@memset a global array" {
const S = struct {
var buf: [1]u32 = .{123};
};
try expect(S.buf[0] == 123);
@memset(&S.buf, 456);
try expect(S.buf[0] == 456);
@memset(&S.buf, S.buf[0] + 333);
try expect(S.buf[0] == 789);
}
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