| // Copyright (C) 2016 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| esid: sec-prepareforordinarycall |
| description: > |
| Creation of new variable environment for the function parameters and body |
| (as distinct from that for the function's BindingIdentifier) |
| info: | |
| [...] |
| 3. Let callerContext be the running execution context. |
| 4. Let calleeContext be PrepareForOrdinaryCall(F, undefined). |
| [...] |
| |
| 9.2.1.1 PrepareForOrdinaryCall |
| |
| [...] |
| 8. Let localEnv be NewFunctionEnvironment(F, newTarget). |
| 9. Set the LexicalEnvironment of calleeContext to localEnv. |
| 10. Set the VariableEnvironment of calleeContext to localEnv. |
| [...] |
| ---*/ |
| |
| var n = 'outside'; |
| var probeBefore = function() { return n; }; |
| var probeBody; |
| |
| // This test intentionally elides parameter expressions because their presence |
| // triggers the creation of an additional LexicalEnvironment dedicated to the |
| // function body (see sec-functiondeclarationinstantiation) |
| var func = function n() { |
| // The initializer is intentionally omitted from the following |
| // VariableStatement in order to demonstrate that a new binding is created |
| // (and not simply re-used from the FunctionExpression's BindingIdentifier). |
| var n; |
| probeBody = function() { return n; }; |
| }; |
| |
| func(); |
| |
| assert.sameValue(probeBefore(), 'outside'); |
| assert.sameValue(probeBody(), undefined); |