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
|
// Verify the environment chain for Debugger.Frame described in
// js/src/vm/EnvironmentObject.h.
const g = newGlobal({ newCompartment: true });
const dbg = Debugger(g);
dbg.onEnterFrame = frame => {
if (frame.script.displayName !== "target") {
return;
}
dbg.onEnterFrame = () => {};
const bindings = {
bindings_prop: 50,
bindings_prop_var: 61,
bindings_prop_lexical: 71,
bindings_prop_unqualified: 81,
};
const {envs, vars} = JSON.parse(frame.evalWithBindings(`
var qualified = 10;
unqualified = 20;
let lexical = 30;
this.prop = 40;
var bindings_prop_var = 60;
let bindings_prop_lexical = 70;
bindings_prop_unqualified = 80;
const vars = {
bindings_prop_var,
bindings_prop_lexical,
bindings_prop_unqualified,
};
const envs = [];
let env = getInnerMostEnvironmentObject();
while (env) {
envs.push({
type: getEnvironmentObjectType(env) || "*global*",
qualified: !!Object.getOwnPropertyDescriptor(env, "qualified"),
unqualified: !!Object.getOwnPropertyDescriptor(env, "unqualified"),
lexical: !!Object.getOwnPropertyDescriptor(env, "lexical"),
prop: !!Object.getOwnPropertyDescriptor(env, "prop"),
bindings_prop: !!Object.getOwnPropertyDescriptor(env, "bindings_prop"),
bindings_prop_var: !!Object.getOwnPropertyDescriptor(env, "bindings_prop_var"),
bindings_prop_var_value: Object.getOwnPropertyDescriptor(env, "bindings_prop_var")?.value,
bindings_prop_lexical: !!Object.getOwnPropertyDescriptor(env, "bindings_prop_lexical"),
bindings_prop_lexical_value: Object.getOwnPropertyDescriptor(env, "bindings_prop_lexical")?.value,
bindings_prop_unqualified: !!Object.getOwnPropertyDescriptor(env, "bindings_prop_unqualified"),
bindings_prop_unqualified_value: Object.getOwnPropertyDescriptor(env, "bindings_prop_unqualified")?.value,
});
env = getEnclosingEnvironmentObject(env);
}
JSON.stringify({envs, vars});
`, bindings).return);
assertEq(vars.bindings_prop_var, 60,
"qualified var should read the value set by the declaration");
assertEq(vars.bindings_prop_lexical, 70,
"lexical should read the value set by the declaration");
assertEq(vars.bindings_prop_unqualified, 80,
"unqualified name should read the value set by the assignment");
assertEq(bindings.bindings_prop_var, 61,
"the original bindings property must not be overwritten for var");
assertEq(bindings.bindings_prop_lexical, 71,
"the original bindings property must not be overwritten for lexical");
assertEq(bindings.bindings_prop_unqualified, 81,
"the original bindings property must not be overwritten for unqualified");
assertEq(envs.length, 4);
let i = 0, env;
// NOTE: lexical is optimized and uses frame slot, even if it conflicts with
// bindings object properties.
env = envs[i]; i++;
assertEq(env.type, "WithEnvironmentObject");
assertEq(env.qualified, false);
assertEq(env.unqualified, false);
assertEq(env.lexical, false);
assertEq(env.prop, false);
assertEq(env.bindings_prop, true, "bindings property must live in the with env for bindings");
assertEq(env.bindings_prop_var, true,
"bindings property must live in the with env for bindings");
assertEq(env.bindings_prop_var_value, 60,
"bindings property must be overwritten for var");
assertEq(env.bindings_prop_lexical, true,
"bindings property must live in the with env for bindings");
assertEq(env.bindings_prop_lexical_value, 71,
"bindings property must not be overwritten for lexical");
assertEq(env.bindings_prop_unqualified, true,
"bindings property must live in the with env for bindings");
assertEq(env.bindings_prop_unqualified_value, 80,
"bindings property must be overwritten for unqualified");
env = envs[i]; i++;
assertEq(env.type, "[DebugProxy] CallObject");
assertEq(env.qualified, true, "qualified var must live in the CallObject");
assertEq(env.unqualified, false);
assertEq(env.lexical, false);
assertEq(env.prop, false);
assertEq(env.bindings_prop, false);
assertEq(env.bindings_prop_var, true,
"qualified var binding must be created in the CallObject even if it conflicts with the bindings object property");
assertEq(env.bindings_prop_var_value, undefined,
"qualified var value must not be set if it conflicts with the bindings object property");
assertEq(env.bindings_prop_lexical, false);
assertEq(env.bindings_prop_unqualified, false);
env = envs[i]; i++;
assertEq(env.type, "[DebugProxy] GlobalLexicalEnvironmentObject");
assertEq(env.qualified, false);
assertEq(env.unqualified, false);
assertEq(env.lexical, false);
assertEq(env.prop, false);
assertEq(env.bindings_prop, false);
assertEq(env.bindings_prop_var, false);
assertEq(env.bindings_prop_lexical, false);
assertEq(env.bindings_prop_unqualified, false);
env = envs[i]; i++;
assertEq(env.type, "*global*");
assertEq(env.qualified, false);
assertEq(env.unqualified, true, "unqualified name must live in the global");
assertEq(env.lexical, false);
assertEq(env.prop, true, "this property must live in the global");
assertEq(env.bindings_prop, false);
assertEq(env.bindings_prop_var, false);
assertEq(env.bindings_prop_lexical, false);
assertEq(env.bindings_prop_unqualified, false);
};
g.eval(`
function target() {
}
target();
`);
|
