v8/test/mjsunit/code-coverage-precise.js

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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --allow-natives-syntax --no-always-opt --no-stress-fullcodegen
// Test precise code coverage.
function GetCoverage(source) {
for (var script of %DebugCollectCoverage()) {
if (script.script.source == source) return script;
}
return undefined;
}
function TestCoverage(name, source, expectation) {
source = source.trim();
eval(source);
%CollectGarbage("collect dead objects");
var coverage = GetCoverage(source);
var result = JSON.stringify(coverage);
print(result);
assertEquals(JSON.stringify(expectation), result, name + " failed");
}
// Without precise coverage enabled, we lose coverage data to the GC.
TestCoverage(
"call an IIFE",
`
(function f() {})();
`,
undefined // The IIFE has been garbage-collected.
);
TestCoverage(
"call locally allocated function",
`
for (var i = 0; i < 10; i++) {
let f = () => 1;
i += f();
}
`,
undefined
);
// This does not happen with precise coverage enabled.
%DebugTogglePreciseCoverage(true);
TestCoverage(
"call an IIFE",
`
(function f() {})();
`,
[{"start":0,"end":20,"count":1},{"start":1,"end":16,"count":1}]
);
TestCoverage(
"call locally allocated function",
`
for (var i = 0; i < 10; i++) {
let f = () => 1;
i += f();
}
`,
[{"start":0,"end":63,"count":1},{"start":41,"end":48,"count":5}]
);
%DebugTogglePreciseCoverage(false);