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// 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(`
// Put direct eval to de-optimize lexical.
eval("");
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, 5);
let i = 0, env;
env = envs[i]; i++;
assertEq(env.type, "BlockLexicalEnvironmentObject");
assertEq(env.qualified, false);
assertEq(env.unqualified, false);
assertEq(env.lexical, true, "lexical must live in the BlockLexicalEnvironmentObject");
assertEq(env.prop, false);
assertEq(env.bindings_prop_var, false);
assertEq(env.bindings_prop_lexical, true,
"lexical must live in the BlockLexicalEnvironmentObject even if it conflicts with the bindings object property");
assertEq(env.bindings_prop_lexical_value, 70);
assertEq(env.bindings_prop_unqualified, false);
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 not 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();
`);
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