summaryrefslogtreecommitdiff
path: root/gcc/testsuite/go.test/test/range.go
blob: 91ccd6307a56de463ad6f5bd456fb644bf8f0d17 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
// $G $D/$F.go && $L $F.$A && ./$A.out

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

// test range over channels

func gen(c chan int, lo, hi int) {
	for i := lo; i <= hi; i++ {
		c <- i
	}
	close(c)
}

func seq(lo, hi int) chan int {
	c := make(chan int)
	go gen(c, lo, hi)
	return c
}

func testchan() {
	s := ""
	for i := range seq('a', 'z') {
		s += string(i)
	}
	if s != "abcdefghijklmnopqrstuvwxyz" {
		println("Wanted lowercase alphabet; got", s)
		panic("fail")
	}
}

// test that range over slice only evaluates
// the expression after "range" once.

var nmake = 0

func makeslice() []int {
	nmake++
	return []int{1, 2, 3, 4, 5}
}

func testslice() {
	s := 0
	nmake = 0
	for _, v := range makeslice() {
		s += v
	}
	if nmake != 1 {
		println("range called makeslice", nmake, "times")
		panic("fail")
	}
	if s != 15 {
		println("wrong sum ranging over makeslice")
		panic("fail")
	}
}

func testslice1() {
	s := 0
	nmake = 0
	for i := range makeslice() {
		s += i
	}
	if nmake != 1 {
		println("range called makeslice", nmake, "times")
		panic("fail")
	}
	if s != 10 {
		println("wrong sum ranging over makeslice")
		panic("fail")
	}
}

// test that range over array only evaluates
// the expression after "range" once.

func makearray() [5]int {
	nmake++
	return [5]int{1, 2, 3, 4, 5}
}

func testarray() {
	s := 0
	nmake = 0
	for _, v := range makearray() {
		s += v
	}
	if nmake != 1 {
		println("range called makearray", nmake, "times")
		panic("fail")
	}
	if s != 15 {
		println("wrong sum ranging over makearray")
		panic("fail")
	}
}

func testarray1() {
	s := 0
	nmake = 0
	for i := range makearray() {
		s += i
	}
	if nmake != 1 {
		println("range called makearray", nmake, "times")
		panic("fail")
	}
	if s != 10 {
		println("wrong sum ranging over makearray")
		panic("fail")
	}
}

func makearrayptr() *[5]int {
	nmake++
	return &[5]int{1, 2, 3, 4, 5}
}

func testarrayptr() {
	nmake = 0
	x := len(makearrayptr())
	if x != 5 || nmake != 1 {
		println("len called makearrayptr", nmake, "times and got len", x)
		panic("fail")
	}
	nmake = 0
	x = cap(makearrayptr())
	if x != 5 || nmake != 1 {
		println("cap called makearrayptr", nmake, "times and got len", x)
		panic("fail")
	}
	s := 0
	nmake = 0
	for _, v := range makearrayptr() {
		s += v
	}
	if nmake != 1 {
		println("range called makearrayptr", nmake, "times")
		panic("fail")
	}
	if s != 15 {
		println("wrong sum ranging over makearrayptr")
		panic("fail")
	}
}

func testarrayptr1() {
	s := 0
	nmake = 0
	for i := range makearrayptr() {
		s += i
	}
	if nmake != 1 {
		println("range called makearrayptr", nmake, "times")
		panic("fail")
	}
	if s != 10 {
		println("wrong sum ranging over makearrayptr")
		panic("fail")
	}
}

// test that range over string only evaluates
// the expression after "range" once.

func makestring() string {
	nmake++
	return "abcd☺"
}

func teststring() {
	s := 0
	nmake = 0
	for _, v := range makestring() {
		s += v
	}
	if nmake != 1 {
		println("range called makestring", nmake, "times")
		panic("fail")
	}
	if s != 'a'+'b'+'c'+'d'+'☺' {
		println("wrong sum ranging over makestring")
		panic("fail")
	}
}

func teststring1() {
	s := 0
	nmake = 0
	for i := range makestring() {
		s += i
	}
	if nmake != 1 {
		println("range called makestring", nmake, "times")
		panic("fail")
	}
	if s != 10 {
		println("wrong sum ranging over makestring")
		panic("fail")
	}
}

// test that range over map only evaluates
// the expression after "range" once.

func makemap() map[int]int {
	nmake++
	return map[int]int{0:'a', 1:'b', 2:'c', 3:'d', 4:'☺'}
}

func testmap() {
	s := 0
	nmake = 0
	for _, v := range makemap() {
		s += v
	}
	if nmake != 1 {
		println("range called makemap", nmake, "times")
		panic("fail")
	}
	if s != 'a'+'b'+'c'+'d'+'☺' {
		println("wrong sum ranging over makemap")
		panic("fail")
	}
}

func testmap1() {
	s := 0
	nmake = 0
	for i := range makemap() {
		s += i
	}
	if nmake != 1 {
		println("range called makemap", nmake, "times")
		panic("fail")
	}
	if s != 10 {
		println("wrong sum ranging over makemap")
		panic("fail")
	}
}

// test that range evaluates the index and value expressions
// exactly once per iteration.

var ncalls = 0

func getvar(p *int) *int {
	ncalls++
	return p
}

func testcalls() {
	var i, v int
	si := 0
	sv := 0
	for *getvar(&i), *getvar(&v) = range [2]int{1, 2} {
		si += i
		sv += v
	}
	if ncalls != 4 {
		println("wrong number of calls:", ncalls, "!= 4")
		panic("fail")
	}
	if si != 1 || sv != 3 {
		println("wrong sum in testcalls", si, sv)
		panic("fail")
	}

	ncalls = 0
	for *getvar(&i), *getvar(&v) = range [0]int{} {
		println("loop ran on empty array")
		panic("fail")
	}
	if ncalls != 0 {
		println("wrong number of calls:", ncalls, "!= 0")
		panic("fail")
	}
}

func main() {
	testchan()
	testarray()
	testarray1()
	testarrayptr()
	testarrayptr1()
	testslice()
	testslice1()
	teststring()
	teststring1()
	testmap()
	testmap1()
	testcalls()
}