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
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
|
// |jit-test| skip-if: !wasmGcEnabled(); test-also=--gc-zeal=2
// We'll be running some binary-format tests shortly.
load(libdir + "wasm-binary.js");
const v2vSigSection = sigSection([{args:[], ret:VoidCode}]);
function checkInvalid(body, errorMessage) {
assertErrorMessage(() => new WebAssembly.Module(
moduleWithSections([v2vSigSection,
declSection([0]),
bodySection([body])])),
WebAssembly.CompileError,
errorMessage);
}
// General test case for struct.new, struct.get, and struct.set: binary tree
// manipulation.
{
let bin = wasmTextToBinary(
`(module
(import "" "print_lp" (func $print_lp))
(import "" "print_rp" (func $print_rp))
(import "" "print_int" (func $print_int (param i32)))
(type $wabbit (struct
(field $x (mut i32))
(field $left (mut (ref null $wabbit)))
(field $right (mut (ref null $wabbit)))))
(global $g (mut (ref null $wabbit)) (ref.null $wabbit))
(global $k (mut i32) (i32.const 0))
(func (export "init") (param $n i32)
(global.set $g (call $make (local.get $n))))
(func $make (param $n i32) (result (ref null $wabbit))
(local $tmp i32)
(local.set $tmp (global.get $k))
(global.set $k (i32.add (local.get $tmp) (i32.const 1)))
(if (result (ref null $wabbit)) (i32.le_s (local.get $n) (i32.const 2))
(then (struct.new $wabbit (local.get $tmp) (ref.null $wabbit) (ref.null $wabbit)))
(else
(block (result (ref null $wabbit))
(struct.new $wabbit
(local.get $tmp)
(call $make (i32.sub (local.get $n) (i32.const 1)))
(call $make (i32.sub (local.get $n) (i32.const 2))))))))
(func (export "accumulate") (result i32)
(call $accum (global.get $g)))
(func $accum (param $w (ref null $wabbit)) (result i32)
(if (result i32) (ref.is_null (local.get $w))
(then (i32.const 0))
(else
(i32.add (struct.get $wabbit 0 (local.get $w))
(i32.sub (call $accum (struct.get $wabbit 1 (local.get $w)))
(call $accum (struct.get $wabbit 2 (local.get $w))))))))
(func (export "reverse")
(call $reverse (global.get $g)))
(func $reverse (param $w (ref null $wabbit))
(local $tmp (ref null $wabbit))
(if (i32.eqz (ref.is_null (local.get $w)))
(then
(block
(struct.set $wabbit 0 (local.get $w) (i32.mul (i32.const 2) (struct.get $wabbit 0 (local.get $w))))
(local.set $tmp (struct.get $wabbit 1 (local.get $w)))
(struct.set $wabbit 1 (local.get $w) (struct.get $wabbit 2 (local.get $w)))
(struct.set $wabbit 2 (local.get $w) (local.get $tmp))
(call $reverse (struct.get $wabbit 1 (local.get $w)))
(call $reverse (struct.get $wabbit 2 (local.get $w)))))))
(func (export "print")
(call $pr (global.get $g)))
(func $pr (param $w (ref null $wabbit))
(if (i32.eqz (ref.is_null (local.get $w)))
(then
(block
(call $print_lp)
(call $print_int (struct.get $wabbit 0 (local.get $w)))
(call $pr (struct.get $wabbit 1 (local.get $w)))
(call $pr (struct.get $wabbit 2 (local.get $w)))
(call $print_rp)))))
)`);
let s = "";
function pr_int(k) { s += k + " "; }
function pr_lp() { s += "(" };
function pr_rp() { s += ")" }
let mod = new WebAssembly.Module(bin);
let ins = new WebAssembly.Instance(mod, {"":{print_int:pr_int,print_lp:pr_lp,print_rp:pr_rp}}).exports;
ins.init(6);
s = ""; ins.print(); assertEq(s, "(0 (1 (2 (3 (4 )(5 ))(6 ))(7 (8 )(9 )))(10 (11 (12 )(13 ))(14 )))");
assertEq(ins.accumulate(), -13);
ins.reverse();
s = ""; ins.print(); assertEq(s, "(0 (20 (28 )(22 (26 )(24 )))(2 (14 (18 )(16 ))(4 (12 )(6 (10 )(8 )))))");
assertEq(ins.accumulate(), 14);
for (let i=10; i < 22; i++ ) {
ins.init(i);
ins.reverse();
gc();
ins.reverse();
}
}
// Sanity check for struct.set: we /can/ store a (ref null T) into a (ref null U) field
// with struct.set if T <: U; this should fall out of normal coercion but good
// to test.
wasmEvalText(
`(module
(type $node (sub (struct (field (mut (ref null $node))))))
(type $nix (sub $node (struct (field (mut (ref null $node))) (field i32))))
(func $f (param $p (ref null $node)) (param $q (ref null $nix))
(struct.set $node 0 (local.get $p) (local.get $q))))`);
// ref.cast: if the downcast succeeds we get the original pointer
assertEq(wasmEvalText(
`(module
(type $node (sub (struct (field i32))))
(type $node2 (sub $node (struct (field i32) (field f32))))
(func $f (param $p (ref null $node)) (result (ref null $node2))
(ref.cast (ref null $node2) (local.get $p)))
(func (export "test") (result i32)
(local $n (ref null $node))
(local.set $n (struct.new $node2 (i32.const 0) (f32.const 12)))
(ref.eq (call $f (local.get $n)) (local.get $n))))`).exports.test(),
1);
// ref.cast: if the pointer is null we trap
assertErrorMessage(() => wasmEvalText(
`(module
(type $node (struct (field i32)))
(type $node2 (struct (field i32) (field f32)))
(func $f (param $p (ref null $node)) (result (ref null $node2))
(ref.cast (ref $node2) (local.get $p)))
(func (export "test") (result eqref)
(call $f (ref.null $node))))`).exports.test(),
WebAssembly.RuntimeError,
/bad cast/,
);
// ref.cast null: if the pointer is null we do not trap
wasmEvalText(
`(module
(type $node (struct (field i32)))
(type $node2 (struct (field i32) (field f32)))
(func $f (param $p (ref null $node)) (result (ref null $node2))
(ref.cast (ref null $node2) (local.get $p)))
(func (export "test") (result eqref)
(call $f (ref.null $node))))`).exports.test();
// And once more with mutable fields
assertEq(wasmEvalText(
`(module
(type $node (sub (struct (field (mut i32)))))
(type $node2 (sub $node (struct (field (mut i32)) (field f32))))
(func $f (param $p (ref null $node)) (result (ref null $node2))
(ref.cast (ref null $node2) (local.get $p)))
(func (export "test") (result i32)
(local $n (ref null $node))
(local.set $n (struct.new $node2 (i32.const 0) (f32.const 12)))
(ref.eq (call $f (local.get $n)) (local.get $n))))`).exports.test(),
1);
// ref.cast: eqref -> struct when the eqref is the right struct;
// special case since eqref requires unboxing
assertEq(wasmEvalText(
`(module
(type $node (struct (field i32)))
(func $f (param $p eqref) (result (ref null $node))
(ref.cast (ref null $node) (local.get $p)))
(func (export "test") (result i32)
(local $n (ref null $node))
(local.set $n (struct.new $node (i32.const 0)))
(ref.eq (call $f (local.get $n)) (local.get $n))))`).exports.test(),
1);
// Can default initialize a struct which zero initializes
{
let {makeA, makeB, makeC} = wasmEvalText(`
(module
(type $a (struct))
(type $b (struct (field i32) (field f32)))
(type $c (struct (field eqref)))
(func (export "makeA") (result eqref)
struct.new_default $a
)
(func (export "makeB") (result eqref)
struct.new_default $b
)
(func (export "makeC") (result eqref)
struct.new_default $c
)
)`).exports;
let a = makeA();
let b = makeB();
assertEq(wasmGcReadField(b, 0), 0);
assertEq(wasmGcReadField(b, 1), 0);
let c = makeC();
assertEq(wasmGcReadField(c, 0), null);
}
// struct.new_default: valid if all struct fields are defaultable
wasmFailValidateText(`(module
(type $a (struct (field (ref $a))))
(func
struct.new_default $a
)
)`, /defaultable/);
wasmFailValidateText(`(module
(type $a (struct (field i32) (field i32) (field (ref $a))))
(func
struct.new_default $a
)
)`, /defaultable/);
// Negative tests
// Attempting to mutate immutable field with struct.set
assertErrorMessage(() => wasmEvalText(
`(module
(type $node (struct (field i32)))
(func $f (param $p (ref null $node))
(struct.set $node 0 (local.get $p) (i32.const 37))))`),
WebAssembly.CompileError,
/field is not mutable/);
// Attempting to store incompatible value in mutable field with struct.set
assertErrorMessage(() => wasmEvalText(
`(module
(type $node (struct (field (mut i32))))
(func $f (param $p (ref null $node))
(struct.set $node 0 (local.get $p) (f32.const 37))))`),
WebAssembly.CompileError,
/expression has type f32 but expected i32/);
// Out-of-bounds reference for struct.get
assertErrorMessage(() => wasmEvalText(
`(module
(type $node (struct (field i32)))
(func $f (param $p (ref null $node)) (result i32)
(struct.get $node 1 (local.get $p))))`),
WebAssembly.CompileError,
/field index out of range/);
// Out-of-bounds reference for struct.set
assertErrorMessage(() => wasmEvalText(
`(module
(type $node (struct (field (mut i32))))
(func $f (param $p (ref null $node))
(struct.set $node 1 (local.get $p) (i32.const 37))))`),
WebAssembly.CompileError,
/field index out of range/);
// Base pointer is of unrelated type to stated type in struct.get
assertErrorMessage(() => wasmEvalText(
`(module
(type $node (struct (field i32)))
(type $snort (struct (field f64)))
(func $f (param $p (ref null $snort)) (result i32)
(struct.get $node 0 (local.get $p))))`),
WebAssembly.CompileError,
/expression has type.*but expected.*/);
// Base pointer is of unrelated type to stated type in struct.set
assertErrorMessage(() => wasmEvalText(
`(module
(type $node (struct (field (mut i32))))
(type $snort (struct (field f64)))
(func $f (param $p (ref null $snort)) (result i32)
(struct.set $node 0 (local.get $p) (i32.const 0))))`),
WebAssembly.CompileError,
/expression has type.*but expected.*/);
// Null pointer dereference in struct.get
assertErrorMessage(function() {
let ins = wasmEvalText(
`(module
(type $node (struct (field i32)))
(func (export "test")
(drop (call $f (ref.null $node))))
(func $f (param $p (ref null $node)) (result i32)
(struct.get $node 0 (local.get $p))))`);
ins.exports.test();
},
WebAssembly.RuntimeError,
/dereferencing null pointer/);
// Null pointer dereference in struct.set
assertErrorMessage(function() {
let ins = wasmEvalText(
`(module
(type $node (struct (field (mut i32))))
(func (export "test")
(call $f (ref.null $node)))
(func $f (param $p (ref null $node))
(struct.set $node 0 (local.get $p) (i32.const 0))))`);
ins.exports.test();
},
WebAssembly.RuntimeError,
/dereferencing null pointer/);
|
