1const std = @import("std");
2const builtin = @import("builtin");
3const expectEqual = std.testing.expectEqual;
4
5test "casting integer address to function pointer" {
6 if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
7
8 addressToFunction();
9 comptime addressToFunction();
10}
11
12fn addressToFunction() void {
13 var addr: usize = 0xdeadbee0;
14 _ = &addr;
15 _ = @as(*const fn () void, @ptrFromInt(addr));
16}
17
18test "mutate through ptr initialized with constant ptrFromInt value" {
19 if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
20 if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
21 if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
22
23 forceCompilerAnalyzeBranchHardCodedPtrDereference(false);
24}
25
26fn forceCompilerAnalyzeBranchHardCodedPtrDereference(x: bool) void {
27 const hardCodedP = @as(*volatile u8, @ptrFromInt(0xdeadbeef));
28 if (x) {
29 hardCodedP.* = hardCodedP.* | 10;
30 } else {
31 return;
32 }
33}
34
35test "@ptrFromInt creates null pointer" {
36 if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
37 if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
38 if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
39
40 const ptr = @as(?*u32, @ptrFromInt(0));
41 try expectEqual(@as(?*u32, null), ptr);
42}
43
44test "@ptrFromInt creates allowzero zero pointer" {
45 if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
46 if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
47 if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
48
49 const ptr = @as(*allowzero u32, @ptrFromInt(0));
50 try expectEqual(@as(usize, 0), @intFromPtr(ptr));
51}