1// Copyright 2021 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package main
6
7import "unsafe"
8
9const (
10	smallInt = 42
11
12	// For bigInt, we use a value that's too big for an int64, but still
13	// fits in uint64. go/constant uses a different representation for
14	// values larger than int64, but the cmd/asm parser can't parse
15	// anything bigger than a uint64.
16	bigInt = 0xffffffffffffffff
17
18	stringVal = "test"
19
20	longStringVal = "this_is_a_string_constant_longer_than_seventy_characters_which_used_to_fail_see_issue_50253"
21)
22
23var (
24	smallIntAsm   int64
25	bigIntAsm     uint64
26	stringAsm     [len(stringVal)]byte
27	longStringAsm [len(longStringVal)]byte
28)
29
30type typ struct {
31	a uint64
32	b [100]uint8
33	c uint8
34}
35
36var (
37	typSize uint64
38
39	typA, typB, typC uint64
40)
41
42func main() {
43	if smallInt != smallIntAsm {
44		println("smallInt", smallInt, "!=", smallIntAsm)
45	}
46	if bigInt != bigIntAsm {
47		println("bigInt", uint64(bigInt), "!=", bigIntAsm)
48	}
49	if stringVal != string(stringAsm[:]) {
50		println("stringVal", stringVal, "!=", string(stringAsm[:]))
51	}
52	if longStringVal != string(longStringAsm[:]) {
53		println("longStringVal", longStringVal, "!=", string(longStringAsm[:]))
54	}
55
56	// We also include boolean consts in go_asm.h, but they're
57	// defined to be "true" or "false", and it's not clear how to
58	// use that in assembly.
59
60	if want := unsafe.Sizeof(typ{}); want != uintptr(typSize) {
61		println("typSize", want, "!=", typSize)
62	}
63	if want := unsafe.Offsetof(typ{}.a); want != uintptr(typA) {
64		println("typA", want, "!=", typA)
65	}
66	if want := unsafe.Offsetof(typ{}.b); want != uintptr(typB) {
67		println("typB", want, "!=", typB)
68	}
69	if want := unsafe.Offsetof(typ{}.c); want != uintptr(typC) {
70		println("typC", want, "!=", typC)
71	}
72}
73