d8bccfe974
Implements the strong mode proposal's restrictions on the syntax of the switch statement. Also fixes a minor bug with empty statements in strong mode and improves StrongUndefinedArrow parser synch tests. BUG=v8:3956 LOG=N Review URL: https://codereview.chromium.org/1084983002 Cr-Commit-Position: refs/heads/master@{#27885}
111 lines
4.0 KiB
JavaScript
111 lines
4.0 KiB
JavaScript
// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --strong-mode
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"use strict";
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function CheckSwitch() {
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let jumpStatements = [
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"break; ",
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"continue; ",
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"break foo; ",
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"continue foo; ",
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"return; ",
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"throw new TypeError(); ",
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"if(1) break; else continue; ",
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"if(1) {1+1; {break;}} else continue; "
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]
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let otherStatements = [
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"null; ",
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"1+1; ",
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"{} ",
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"for(;false;) {break;} ",
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"for(;false;) {1+1; {throw new TypeError();}} ",
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"(function(){return});",
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"(function(){throw new TypeError();});",
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"{break; 1+1;} ",
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"if(1) break; ",
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"if(1) break; else 1+1; ",
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"if(1) 1+1; else break; ",
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]
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let successContexts = [
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["switch(1) {case 1: ", "case 2: }"],
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["switch(1) {case 1: case 2: ", "default: }"],
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["switch(1) {case 1: case 2: ", "default: {}}"],
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["switch(1) {case 1: case 2: ", "default: 1+1}"],
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["switch(1) {case 1: break; case 2: ", "default: }"],
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["switch(1) {case 1: case 2: break; case 3: ", "case 4: default: }"],
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["switch(1) {case 1: if(1) break; else {", "} default: break;}"]
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]
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let strongThrowContexts = [
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["switch(1) {case 1: 1+1; case 2: ", "}"],
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["switch(1) {case 1: bar: break foo; case 2: ", "}"],
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["switch(1) {case 1: bar:", " case 2: }"],
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["switch(1) {case 1: bar:{ ", "} case 2: }"],
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["switch(1) {case 1: bar:{ ", "} default: break;}"],
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["switch(1) {case 1: { bar:{ { ", "} } } default: break;}"],
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["switch(1) {case 1: { { { ", "} 1+1;} } default: break;}"],
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["switch(1) {case 1: if(1) {", "} default: break;}"],
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["switch(1) {case 1: bar:if(1) break; else {", "} default: break;}"]
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]
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let sloppy_wrap = ["function f() { foo:for(;;) {", "}}"];
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let strong_wrap = ["function f() { 'use strong'; foo:for(;;) {", "}}"];
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for (let context of successContexts) {
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let sloppy_prefix = sloppy_wrap[0] + context[0];
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let sloppy_suffix = context[1] + sloppy_wrap[1];
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let strong_prefix = strong_wrap[0] + context[0];
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let strong_suffix = context[1] + strong_wrap[1];
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for (let code of jumpStatements) {
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assertDoesNotThrow(strong_wrap[0] + "switch(1) {case 1: " + code + "}}}");
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assertDoesNotThrow(strong_prefix + code + strong_suffix);
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assertDoesNotThrow(strong_prefix + "{ 1+1; " + code + "}" +
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strong_suffix);
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assertDoesNotThrow(strong_prefix + "{ 1+1; { 1+1; " + code + "}}" +
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strong_suffix);
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assertDoesNotThrow(strong_prefix + "if(1) " + code + "else break;" +
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strong_suffix);
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assertDoesNotThrow(strong_prefix + "if(1) " + code +
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"else if (1) break; else " + code + strong_suffix);
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}
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for (let code of otherStatements) {
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assertDoesNotThrow(sloppy_prefix + code + sloppy_suffix);
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assertThrows(strong_prefix + code + strong_suffix, SyntaxError);
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}
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}
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for (let context of strongThrowContexts) {
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let sloppy_prefix = sloppy_wrap[0] + context[0];
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let sloppy_suffix = context[1] + sloppy_wrap[1];
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let strong_prefix = strong_wrap[0] + context[0];
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let strong_suffix = context[1] + strong_wrap[1];
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for (let code of jumpStatements.concat(otherStatements)) {
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assertDoesNotThrow(sloppy_prefix + code + sloppy_suffix);
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assertThrows(strong_prefix + code + strong_suffix, SyntaxError);
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}
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}
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for (let code of otherStatements) {
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assertDoesNotThrow("switch(1) {default: " + code + "}");
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assertDoesNotThrow("switch(1) {case 1: " + code + "}");
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assertDoesNotThrow("switch(1) {case 1: default: " + code + "}");
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assertDoesNotThrow("switch(1) {case 1: break; default: " + code + "}");
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assertDoesNotThrow("switch(1) {case 1: " + code + "break; default: }");
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}
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}
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CheckSwitch();
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assertDoesNotThrow("'use strong'; switch(1) {}");
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assertDoesNotThrow("'use strong'; switch(1) {case 1:}");
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assertDoesNotThrow("'use strong'; switch(1) {default:}");
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assertDoesNotThrow("'use strong'; switch(1) {case 1: case 2: default:}");
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