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speed up --reduce-test via result caching (#3725)

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This commit is contained in:
Alex Lam S.L
2020-02-15 22:43:34 +00:00
committed by GitHub
parent fbfa6178a6
commit c13caf4876
1 changed files with 15 additions and 9 deletions
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24
test/reduce.js
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@@ -24,12 +24,13 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
var verbose = reduce_options.verbose;
var minify_options_json = JSON.stringify(minify_options, null, 2);
var timeout = 1000; // start with a low timeout
var result_cache = Object.create(null);
var differs;
if (testcase instanceof U.AST_Node) testcase = testcase.print_to_string();
// the initial timeout to assess the viability of the test case must be large
if (differs = producesDifferentResultWhenMinified(testcase, minify_options, max_timeout)) {
if (differs = producesDifferentResultWhenMinified(result_cache, testcase, minify_options, max_timeout)) {
if (differs.error) return differs;
// Replace expressions with constants that will be parsed into
// AST_Nodes as required. Each AST_Node has its own permutation count,
@@ -399,12 +400,15 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
console.error("*** Discarding permutation and continuing.");
continue;
}
var diff = producesDifferentResultWhenMinified(code, minify_options, timeout);
var diff = producesDifferentResultWhenMinified(result_cache, code, minify_options, timeout);
if (diff) {
if (diff.timed_out) {
// can't trust the validity of `code_ast` and `code` when timed out.
// no harm done - just ignore latest change and continue iterating.
if (timeout < max_timeout) timeout += 250;
if (timeout < max_timeout) {
timeout += 250;
result_cache = Object.create(null);
}
} else if (diff.error) {
// something went wrong during minify() - could be malformed AST or genuine bug.
// no harm done - just log code & error, ignore latest change and continue iterating.
@@ -437,7 +441,7 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
testcase = "// Can't reproduce test failure with minify options provided:"
+ "\n// " + to_comment(minify_options_json);
}
var result = U.minify(testcase.replace(/\u001b\[\d+m/g, ""), {
return U.minify(testcase.replace(/\u001b\[\d+m/g, ""), {
compress: false,
mangle: false,
output: {
@@ -446,7 +450,6 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
comments: true,
}
});
return result;
};
function to_comment(value) {
@@ -515,15 +518,19 @@ function to_statement(node) {
});
}
function producesDifferentResultWhenMinified(code, minify_options, timeout) {
function run_code(result_cache, code, toplevel, timeout) {
return result_cache[code] || (result_cache[code] = sandbox.run_code(code, toplevel, timeout));
}
function producesDifferentResultWhenMinified(result_cache, code, minify_options, timeout) {
var minified = U.minify(code, minify_options);
if (minified.error) return minified;
var toplevel = minify_options.toplevel;
var unminified_result = sandbox.run_code(code, toplevel, timeout);
var unminified_result = run_code(result_cache, code, toplevel, timeout);
if (/timed out/i.test(unminified_result)) return false;
var minified_result = sandbox.run_code(minified.code, toplevel, timeout);
var minified_result = run_code(result_cache, minified.code, toplevel, timeout);
if (/timed out/i.test(minified_result)) return { timed_out: true };
return !sandbox.same_stdout(unminified_result, minified_result) ? {
@@ -531,5 +538,4 @@ function producesDifferentResultWhenMinified(code, minify_options, timeout) {
minified_result: minified_result,
} : false;
}
Error.stackTraceLimit = Infinity;