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vm.js
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vm.js
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'use strict';
const {
ReflectApply,
Symbol,
} = primordials;
const {
ContextifyScript,
compileFunction,
isContext: _isContext,
} = internalBinding('contextify');
const {
runInContext,
} = ContextifyScript.prototype;
const {
default_host_defined_options,
vm_dynamic_import_missing_flag,
} = internalBinding('symbols');
const {
validateFunction,
validateObject,
kValidateObjectAllowArray,
} = require('internal/validators');
const {
getOptionValue,
} = require('internal/options');
function isContext(object) {
validateObject(object, 'object', kValidateObjectAllowArray);
return _isContext(object);
}
function getHostDefinedOptionId(importModuleDynamically, hint) {
if (importModuleDynamically !== undefined) {
// Check that it's either undefined or a function before we pass
// it into the native constructor.
validateFunction(importModuleDynamically,
'options.importModuleDynamically');
}
if (importModuleDynamically === undefined) {
// We need a default host defined options that are the same for all
// scripts not needing custom module callbacks so that the isolate
// compilation cache can be hit.
return default_host_defined_options;
}
// We should've thrown here immediately when we introduced
// --experimental-vm-modules and importModuleDynamically, but since
// users are already using this callback to throw a similar error,
// we also defer the error to the time when an actual import() is called
// to avoid breaking them. To ensure that the isolate compilation
// cache can still be hit, use a constant sentinel symbol here.
if (!getOptionValue('--experimental-vm-modules')) {
return vm_dynamic_import_missing_flag;
}
return Symbol(hint);
}
function registerImportModuleDynamically(referrer, importModuleDynamically) {
const { importModuleDynamicallyWrap } = require('internal/vm/module');
const { registerModule } = require('internal/modules/esm/utils');
registerModule(referrer, {
__proto__: null,
importModuleDynamically:
importModuleDynamicallyWrap(importModuleDynamically),
});
}
function internalCompileFunction(
code, filename, lineOffset, columnOffset,
cachedData, produceCachedData, parsingContext, contextExtensions,
params, hostDefinedOptionId, importModuleDynamically) {
const result = compileFunction(
code,
filename,
lineOffset,
columnOffset,
cachedData,
produceCachedData,
parsingContext,
contextExtensions,
params,
hostDefinedOptionId,
);
if (produceCachedData) {
result.function.cachedDataProduced = result.cachedDataProduced;
}
if (result.cachedData) {
result.function.cachedData = result.cachedData;
}
if (typeof result.cachedDataRejected === 'boolean') {
result.function.cachedDataRejected = result.cachedDataRejected;
}
if (importModuleDynamically !== undefined) {
registerImportModuleDynamically(result.function, importModuleDynamically);
}
return result;
}
function makeContextifyScript(code,
filename,
lineOffset,
columnOffset,
cachedData,
produceCachedData,
parsingContext,
hostDefinedOptionId,
importModuleDynamically) {
let script;
// Calling `ReThrow()` on a native TryCatch does not generate a new
// abort-on-uncaught-exception check. A dummy try/catch in JS land
// protects against that.
try { // eslint-disable-line no-useless-catch
script = new ContextifyScript(code,
filename,
lineOffset,
columnOffset,
cachedData,
produceCachedData,
parsingContext,
hostDefinedOptionId);
} catch (e) {
throw e; /* node-do-not-add-exception-line */
}
if (importModuleDynamically !== undefined) {
registerImportModuleDynamically(script, importModuleDynamically);
}
return script;
}
// Internal version of vm.Script.prototype.runInThisContext() which skips
// argument validation.
function runScriptInThisContext(script, displayErrors, breakOnFirstLine) {
return ReflectApply(
runInContext,
script,
[
null, // sandbox - use current context
-1, // timeout
displayErrors, // displayErrors
false, // breakOnSigint
breakOnFirstLine, // breakOnFirstLine
],
);
}
module.exports = {
getHostDefinedOptionId,
internalCompileFunction,
isContext,
makeContextifyScript,
registerImportModuleDynamically,
runScriptInThisContext,
};