test-preparser.cc 37.1 KB
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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.

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#include "src/api/api-inl.h"
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#include "src/ast/ast.h"
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#include "src/codegen/compiler.h"
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#include "src/objects/objects-inl.h"
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#include "src/parsing/parse-info.h"
#include "src/parsing/parsing.h"
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#include "src/parsing/preparse-data-impl.h"
#include "src/parsing/preparse-data.h"
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#include "test/cctest/cctest.h"
#include "test/cctest/scope-test-helper.h"
#include "test/cctest/unicode-helpers.h"

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namespace {

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enum SkipTests {
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  DONT_SKIP = 0,
  // Skip if the test function declares itself strict, otherwise don't skip.
  SKIP_STRICT_FUNCTION = 1,
  // Skip if there's a "use strict" directive above the test.
  SKIP_STRICT_OUTER = 1 << 1,
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  SKIP_ARROW = 1 << 2,
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  SKIP_STRICT = SKIP_STRICT_FUNCTION | SKIP_STRICT_OUTER
};

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enum class PreciseMaybeAssigned { YES, NO };

enum class Bailout { BAILOUT_IF_OUTER_SLOPPY, NO };

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}  // namespace

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TEST(PreParserScopeAnalysis) {
  i::Isolate* isolate = CcTest::i_isolate();
  i::Factory* factory = isolate->factory();
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  LocalContext env;
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  struct Outer {
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    const char* code;
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    bool strict_outer;
    bool strict_test_function;
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    bool arrow;
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  } outers[] = {
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      // Normal case (test function at the laziness boundary):
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      {"function test(%s) { %s function skippable() { } } test;", false, false,
       false},

      {"var test2 = function test(%s) { %s function skippable() { } }; test2",
       false, false, false},
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      // Arrow functions (they can never be at the laziness boundary):
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      {"function test() { (%s) => { %s }; function skippable() { } } test;",
       false, false, true},

      // Repeat the above mentioned cases with global 'use strict'
      {"'use strict'; function test(%s) { %s function skippable() { } } test;",
       true, false, false},

      {"'use strict'; var test2 = function test(%s) { %s \n"
       "function skippable() { } }; test2",
       true, false, false},

      {"'use strict'; function test() { (%s) => { %s };\n"
       "function skippable() { } } test;",
       true, false, true},
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      // ... and with the test function declaring itself strict:
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      {"function test(%s) { 'use strict'; %s function skippable() { } } test;",
       false, true, false},

      {"var test2 = function test(%s) { 'use strict'; %s \n"
       "function skippable() { } }; test2",
       false, true, false},

      {"function test() { 'use strict'; (%s) => { %s };\n"
       "function skippable() { } } test;",
       false, true, true},
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      // Methods containing skippable functions.
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      {"function get_method() {\n"
       "  class MyClass { test_method(%s) { %s function skippable() { } } }\n"
       "  var o = new MyClass(); return o.test_method;\n"
       "}\n"
       "get_method();",
       true, true, false},
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      // Corner case: function expression with name "arguments".
      {"var test = function arguments(%s) { %s function skippable() { } };\n"
       "test;\n",
       false, false, false}

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      // FIXME(marja): Generators and async functions
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  };
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  struct Inner {
    Inner(const char* s) : source(s) {}  // NOLINT
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    Inner(const char* s, SkipTests skip) : source(s), skip(skip) {}
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    Inner(const char* s, SkipTests skip, PreciseMaybeAssigned precise)
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        : source(s), skip(skip), precise_maybe_assigned(precise) {}
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    Inner(const char* p, const char* s) : params(p), source(s) {}
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    Inner(const char* p, const char* s, SkipTests skip)
        : params(p), source(s), skip(skip) {}
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    Inner(const char* p, const char* s, SkipTests skip,
          PreciseMaybeAssigned precise)
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        : params(p), source(s), skip(skip), precise_maybe_assigned(precise) {}
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    Inner(const char* p, const char* s, SkipTests skip, Bailout bailout)
        : params(p), source(s), skip(skip), bailout(bailout) {}
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    const char* params = "";
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    const char* source;
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    SkipTests skip = DONT_SKIP;
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    PreciseMaybeAssigned precise_maybe_assigned = PreciseMaybeAssigned::YES;
    Bailout bailout = Bailout::NO;
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    std::function<void()> prologue = nullptr;
    std::function<void()> epilogue = nullptr;
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  } inners[] = {
      // Simple cases
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      {"var1;"},
      {"var1 = 5;"},
      {"if (true) {}"},
      {"function f1() {}"},
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      {"test;"},
      {"test2;"},
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      // Var declarations and assignments.
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      {"var var1;"},
      {"var var1; var1 = 5;"},
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      {"if (true) { var var1; }", DONT_SKIP, PreciseMaybeAssigned::NO},
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      {"if (true) { var var1; var1 = 5; }"},
      {"var var1; function f() { var1; }"},
      {"var var1; var1 = 5; function f() { var1; }"},
      {"var var1; function f() { var1 = 5; }"},
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      {"function f1() { f2(); } function f2() {}"},
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      // Let declarations and assignments.
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      {"let var1;"},
      {"let var1; var1 = 5;"},
      {"if (true) { let var1; }"},
      {"if (true) { let var1; var1 = 5; }"},
      {"let var1; function f() { var1; }"},
      {"let var1; var1 = 5; function f() { var1; }"},
      {"let var1; function f() { var1 = 5; }"},
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      // Const declarations.
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      {"const var1 = 5;"},
      {"if (true) { const var1 = 5; }"},
      {"const var1 = 5; function f() { var1; }"},
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      // Functions.
      {"function f1() { let var2; }"},
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      {"var var1 = function f1() { let var2; };"},
      {"let var1 = function f1() { let var2; };"},
      {"const var1 = function f1() { let var2; };"},
      {"var var1 = function() { let var2; };"},
      {"let var1 = function() { let var2; };"},
      {"const var1 = function() { let var2; };"},
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      {"function *f1() { let var2; }"},
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      {"let var1 = function *f1() { let var2; };"},
      {"let var1 = function*() { let var2; };"},
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      {"async function f1() { let var2; }"},
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      {"let var1 = async function f1() { let var2; };"},
      {"let var1 = async function() { let var2; };"},
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      // Redeclarations.
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      {"var var1; var var1;"},
      {"var var1; var var1; var1 = 5;"},
      {"var var1; if (true) { var var1; }"},
      {"if (true) { var var1; var var1; }"},
      {"var var1; if (true) { var var1; var1 = 5; }"},
      {"if (true) { var var1; var var1; var1 = 5; }"},
      {"var var1; var var1; function f() { var1; }"},
      {"var var1; var var1; function f() { var1 = 5; }"},
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      // Shadowing declarations.
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      {"var var1; if (true) { var var1; }"},
      {"var var1; if (true) { let var1; }"},
      {"let var1; if (true) { let var1; }"},
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      {"var var1; if (true) { const var1 = 0; }"},
      {"const var1 = 0; if (true) { const var1 = 0; }"},
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      // Variables deeper in the subscopes (scopes without variables inbetween).
      {"if (true) { if (true) { function f() { var var1 = 5; } } }"},

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      // Arguments and this.
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      {"arguments;"},
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      {"arguments = 5;", SKIP_STRICT},
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      {"if (true) { arguments; }"},
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      {"if (true) { arguments = 5; }", SKIP_STRICT},
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      {"() => { arguments; };"},
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      {"var1, var2, var3", "arguments;"},
      {"var1, var2, var3", "arguments = 5;", SKIP_STRICT},
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      {"var1, var2, var3", "() => { arguments; };"},
      {"var1, var2, var3", "() => { arguments = 5; };", SKIP_STRICT},
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      {"this;"},
      {"if (true) { this; }"},
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      {"() => { this; };"},
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      // Variable called "arguments"
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      {"var arguments;", SKIP_STRICT},
      {"var arguments; arguments = 5;", SKIP_STRICT},
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      {"if (true) { var arguments; }", SKIP_STRICT, PreciseMaybeAssigned::NO},
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      {"if (true) { var arguments; arguments = 5; }", SKIP_STRICT},
      {"var arguments; function f() { arguments; }", SKIP_STRICT},
      {"var arguments; arguments = 5; function f() { arguments; }",
       SKIP_STRICT},
      {"var arguments; function f() { arguments = 5; }", SKIP_STRICT},

      {"let arguments;", SKIP_STRICT},
      {"let arguments; arguments = 5;", SKIP_STRICT},
      {"if (true) { let arguments; }", SKIP_STRICT},
      {"if (true) { let arguments; arguments = 5; }", SKIP_STRICT},
      {"let arguments; function f() { arguments; }", SKIP_STRICT},
      {"let arguments; arguments = 5; function f() { arguments; }",
       SKIP_STRICT},
      {"let arguments; function f() { arguments = 5; }", SKIP_STRICT},

      {"const arguments = 5;", SKIP_STRICT},
      {"if (true) { const arguments = 5; }", SKIP_STRICT},
      {"const arguments = 5; function f() { arguments; }", SKIP_STRICT},
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      // Destructuring declarations.
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      {"var [var1, var2] = [1, 2];"},
      {"var [var1, var2, [var3, var4]] = [1, 2, [3, 4]];"},
      {"var [{var1: var2}, {var3: var4}] = [{var1: 1}, {var3: 2}];"},
      {"var [var1, ...var2] = [1, 2, 3];"},

      {"var {var1: var2, var3: var4} = {var1: 1, var3: 2};"},
      {"var {var1: var2, var3: {var4: var5}} = {var1: 1, var3: {var4: 2}};"},
      {"var {var1: var2, var3: [var4, var5]} = {var1: 1, var3: [2, 3]};"},

      {"let [var1, var2] = [1, 2];"},
      {"let [var1, var2, [var3, var4]] = [1, 2, [3, 4]];"},
      {"let [{var1: var2}, {var3: var4}] = [{var1: 1}, {var3: 2}];"},
      {"let [var1, ...var2] = [1, 2, 3];"},

      {"let {var1: var2, var3: var4} = {var1: 1, var3: 2};"},
      {"let {var1: var2, var3: {var4: var5}} = {var1: 1, var3: {var4: 2}};"},
      {"let {var1: var2, var3: [var4, var5]} = {var1: 1, var3: [2, 3]};"},

      {"const [var1, var2] = [1, 2];"},
      {"const [var1, var2, [var3, var4]] = [1, 2, [3, 4]];"},
      {"const [{var1: var2}, {var3: var4}] = [{var1: 1}, {var3: 2}];"},
      {"const [var1, ...var2] = [1, 2, 3];"},

      {"const {var1: var2, var3: var4} = {var1: 1, var3: 2};"},
      {"const {var1: var2, var3: {var4: var5}} = {var1: 1, var3: {var4: 2}};"},
      {"const {var1: var2, var3: [var4, var5]} = {var1: 1, var3: [2, 3]};"},
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      // Referencing the function variable.
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      {"test;"},
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      {"function f1() { f1; }"},
      {"function f1() { function f2() { f1; } }"},
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      {"function arguments() {}", SKIP_STRICT},
      {"function f1() {} function f1() {}", SKIP_STRICT},
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      {"var f1; function f1() {}"},
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      // Assigning to the function variable.
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      {"test = 3;"},
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      {"function f1() { f1 = 3; }"},
      {"function f1() { f1; } f1 = 3;"},
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      {"function arguments() {} arguments = 8;", SKIP_STRICT},
      {"function f1() {} f1 = 3; function f1() {}", SKIP_STRICT},
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      // Evals.
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      {"var var1; eval('');"},
      {"var var1; function f1() { eval(''); }"},
      {"let var1; eval('');"},
      {"let var1; function f1() { eval(''); }"},
      {"const var1 = 10; eval('');"},
      {"const var1 = 10; function f1() { eval(''); }"},
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      // Standard for loops.
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      {"for (var var1 = 0; var1 < 10; ++var1) { }"},
      {"for (let var1 = 0; var1 < 10; ++var1) { }"},
      {"for (const var1 = 0; var1 < 10; ++var1) { }"},

      {"for (var var1 = 0; var1 < 10; ++var1) { function foo() { var1; } }"},
      {"for (let var1 = 0; var1 < 10; ++var1) { function foo() { var1; } }"},
      {"for (const var1 = 0; var1 < 10; ++var1) { function foo() { var1; } }"},
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      // For of loops
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      {"for (var1 of [1, 2]) { }"},
      {"for (var var1 of [1, 2]) { }"},
      {"for (let var1 of [1, 2]) { }"},
      {"for (const var1 of [1, 2]) { }"},

      {"for (var1 of [1, 2]) { var1; }"},
      {"for (var var1 of [1, 2]) { var1; }"},
      {"for (let var1 of [1, 2]) { var1; }"},
      {"for (const var1 of [1, 2]) { var1; }"},

      {"for (var1 of [1, 2]) { var1 = 0; }"},
      {"for (var var1 of [1, 2]) { var1 = 0; }"},
      {"for (let var1 of [1, 2]) { var1 = 0; }"},
      {"for (const var1 of [1, 2]) { var1 = 0; }"},

      {"for (var1 of [1, 2]) { function foo() { var1; } }"},
      {"for (var var1 of [1, 2]) { function foo() { var1; } }"},
      {"for (let var1 of [1, 2]) { function foo() { var1; } }"},
      {"for (const var1 of [1, 2]) { function foo() { var1; } }"},

      {"for (var1 of [1, 2]) { function foo() { var1 = 0; } }"},
      {"for (var var1 of [1, 2]) { function foo() { var1 = 0; } }"},
      {"for (let var1 of [1, 2]) { function foo() { var1 = 0; } }"},
      {"for (const var1 of [1, 2]) { function foo() { var1 = 0; } }"},
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      // For in loops
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      {"for (var1 in {a: 6}) { }"},
      {"for (var var1 in {a: 6}) { }"},
      {"for (let var1 in {a: 6}) { }"},
      {"for (const var1 in {a: 6}) { }"},

      {"for (var1 in {a: 6}) { var1; }"},
      {"for (var var1 in {a: 6}) { var1; }"},
      {"for (let var1 in {a: 6}) { var1; }"},
      {"for (const var1 in {a: 6}) { var1; }"},

      {"for (var1 in {a: 6}) { var1 = 0; }"},
      {"for (var var1 in {a: 6}) { var1 = 0; }"},
      {"for (let var1 in {a: 6}) { var1 = 0; }"},
      {"for (const var1 in {a: 6}) { var1 = 0; }"},

      {"for (var1 in {a: 6}) { function foo() { var1; } }"},
      {"for (var var1 in {a: 6}) { function foo() { var1; } }"},
      {"for (let var1 in {a: 6}) { function foo() { var1; } }"},
      {"for (const var1 in {a: 6}) { function foo() { var1; } }"},

      {"for (var1 in {a: 6}) { function foo() { var1 = 0; } }"},
      {"for (var var1 in {a: 6}) { function foo() { var1 = 0; } }"},
      {"for (let var1 in {a: 6}) { function foo() { var1 = 0; } }"},
      {"for (const var1 in {a: 6}) { function foo() { var1 = 0; } }"},

      {"for (var1 in {a: 6}) { function foo() { var1 = 0; } }"},
      {"for (var var1 in {a: 6}) { function foo() { var1 = 0; } }"},
      {"for (let var1 in {a: 6}) { function foo() { var1 = 0; } }"},
      {"for (const var1 in {a: 6}) { function foo() { var1 = 0; } }"},
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      // Destructuring loop variable
      {"for ([var1, var2] of [[1, 1], [2, 2]]) { }"},
      {"for (var [var1, var2] of [[1, 1], [2, 2]]) { }"},
      {"for (let [var1, var2] of [[1, 1], [2, 2]]) { }"},
      {"for (const [var1, var2] of [[1, 1], [2, 2]]) { }"},

      {"for ([var1, var2] of [[1, 1], [2, 2]]) { var2 = 3; }"},
      {"for (var [var1, var2] of [[1, 1], [2, 2]]) { var2 = 3; }"},
      {"for (let [var1, var2] of [[1, 1], [2, 2]]) { var2 = 3; }"},
      {"for (const [var1, var2] of [[1, 1], [2, 2]]) { var2 = 3; }"},

      {"for ([var1, var2] of [[1, 1], [2, 2]]) { () => { var2 = 3; } }"},
      {"for (var [var1, var2] of [[1, 1], [2, 2]]) { () => { var2 = 3; } }"},
      {"for (let [var1, var2] of [[1, 1], [2, 2]]) { () => { var2 = 3; } }"},
      {"for (const [var1, var2] of [[1, 1], [2, 2]]) { () => { var2 = 3; } }"},

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      // Skippable function in loop header
      {"for (let [var1, var2 = function() { }] of [[1]]) { }"},
      {"for (let [var1, var2 = function() { var1; }] of [[1]]) { }"},
      {"for (let [var1, var2 = function() { var2; }] of [[1]]) { }"},
      {"for (let [var1, var2 = function() { var1; var2; }] of [[1]]) { }"},
      {"for (let [var1, var2 = function() { var1 = 0; }] of [[1]]) { }"},
      {"for (let [var1, var2 = function() { var2 = 0; }] of [[1]]) { }"},
      {"for (let [var1, var2 = function() { var1 = 0; var2 = 0; }] of [[1]]) { "
       "}"},

      {"for (let [var1, var2 = function() { }] of [[1]]) { function f() { "
       "var1; } }"},
      {"for (let [var1, var2 = function() { }] of [[1]]) { function f() { "
       "var2; } }"},
      {"for (let [var1, var2 = function() { }] of [[1]]) { function f() { "
       "var1; var2; } }"},
      {"for (let [var1, var2 = function() { }] of [[1]]) { function f() { "
       "var1 = 0; } }"},
      {"for (let [var1, var2 = function() { }] of [[1]]) { function f() { "
       "var2 = 0; } }"},
      {"for (let [var1, var2 = function() { }] of [[1]]) { function f() { "
       "var1 = 0; var2 = 0; } }"},
      {"for (let [var1, var2 = function() { var1; }] of [[1]]) { "
       "function f() { var1; } }"},
      {"for (let [var1, var2 = function() { var1; }] of [[1]]) { "
       "function f() { var2; } }"},
      {"for (let [var1, var2 = function() { var1; }] of [[1]]) { "
       "function f() { var1; var2; } }"},
      {"for (let [var1, var2 = function() { var2; }] of [[1]]) { "
       "function f() { var1; } }"},
      {"for (let [var1, var2 = function() { var2; }] of [[1]]) { "
       "function f() { var2; } }"},
      {"for (let [var1, var2 = function() { var2; }] of [[1]]) { "
       "function f() { var1; var2; } }"},

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      // Loops without declarations
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      {"var var1 = 0; for ( ; var1 < 2; ++var1) { }"},
      {"var var1 = 0; for ( ; var1 < 2; ++var1) { function foo() { var1; } }"},
      {"var var1 = 0; for ( ; var1 > 2; ) { }"},
      {"var var1 = 0; for ( ; var1 > 2; ) { function foo() { var1; } }"},
      {"var var1 = 0; for ( ; var1 > 2; ) { function foo() { var1 = 6; } }"},

      {"var var1 = 0; for(var1; var1 < 2; ++var1) { }"},
      {"var var1 = 0; for (var1; var1 < 2; ++var1) { function foo() { var1; } "
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       "}"},
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      {"var var1 = 0; for (var1; var1 > 2; ) { }"},
      {"var var1 = 0; for (var1; var1 > 2; ) { function foo() { var1; } }"},
      {"var var1 = 0; for (var1; var1 > 2; ) { function foo() { var1 = 6; } }"},
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      // Block functions (potentially sloppy).
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      {"if (true) { function f1() {} }"},
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      {"if (true) { function f1() {} function f1() {} }", SKIP_STRICT},
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      {"if (true) { if (true) { function f1() {} } }"},
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      {"if (true) { if (true) { function f1() {} function f1() {} } }",
       SKIP_STRICT},
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      {"if (true) { function f1() {} f1 = 3; }"},

      {"if (true) { function f1() {} function foo() { f1; } }"},
      {"if (true) { function f1() {} } function foo() { f1; }"},
      {"if (true) { function f1() {} function f1() {} function foo() { f1; } "
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       "}",
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       SKIP_STRICT},
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      {"if (true) { function f1() {} function f1() {} } function foo() { f1; "
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       "}",
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       SKIP_STRICT},
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      {"if (true) { if (true) { function f1() {} } function foo() { f1; } }"},
      {"if (true) { if (true) { function f1() {} function f1() {} } function "
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       "foo() { f1; } }",
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       SKIP_STRICT},
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      {"if (true) { function f1() {} f1 = 3; function foo() { f1; } }"},
      {"if (true) { function f1() {} f1 = 3; } function foo() { f1; }"},
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      {"var f1 = 1; if (true) { function f1() {} }"},
      {"var f1 = 1; if (true) { function f1() {} } function foo() { f1; }"},
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      {"if (true) { function f1() {} function f2() { f1(); } }"},

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      {"if (true) { function *f1() {} }"},
      {"if (true) { async function f1() {} }"},

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      // (Potentially sloppy) block function shadowing a catch variable.
      {"try { } catch(var1) { if (true) { function var1() {} } }"},

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      // Simple parameters.
      {"var1", ""},
      {"var1", "var1;"},
      {"var1", "var1 = 9;"},
      {"var1", "function f1() { var1; }"},
      {"var1", "function f1() { var1 = 9; }"},

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      {"var1, var2", ""},
      {"var1, var2", "var2;"},
      {"var1, var2", "var2 = 9;"},
      {"var1, var2", "function f1() { var2; }"},
      {"var1, var2", "function f1() { var2 = 9; }"},
      {"var1, var2", "var1;"},
      {"var1, var2", "var1 = 9;"},
      {"var1, var2", "function f1() { var1; }"},
      {"var1, var2", "function f1() { var1 = 9; }"},

462
      // Duplicate parameters.
463 464 465 466 467 468 469
      {"var1, var1", "", SkipTests(SKIP_STRICT | SKIP_ARROW)},
      {"var1, var1", "var1;", SkipTests(SKIP_STRICT | SKIP_ARROW)},
      {"var1, var1", "var1 = 9;", SkipTests(SKIP_STRICT | SKIP_ARROW)},
      {"var1, var1", "function f1() { var1; }",
       SkipTests(SKIP_STRICT | SKIP_ARROW)},
      {"var1, var1", "function f1() { var1 = 9; }",
       SkipTests(SKIP_STRICT | SKIP_ARROW)},
470 471 472

      // If the function declares itself strict, non-simple parameters aren't
      // allowed.
473

474
      // Rest parameter.
475 476 477 478 479 480 481 482 483 484 485
      {"...var2", "", SKIP_STRICT_FUNCTION},
      {"...var2", "var2;", SKIP_STRICT_FUNCTION},
      {"...var2", "var2 = 9;", SKIP_STRICT_FUNCTION},
      {"...var2", "function f1() { var2; }", SKIP_STRICT_FUNCTION},
      {"...var2", "function f1() { var2 = 9; }", SKIP_STRICT_FUNCTION},

      {"var1, ...var2", "", SKIP_STRICT_FUNCTION},
      {"var1, ...var2", "var2;", SKIP_STRICT_FUNCTION},
      {"var1, ...var2", "var2 = 9;", SKIP_STRICT_FUNCTION},
      {"var1, ...var2", "function f1() { var2; }", SKIP_STRICT_FUNCTION},
      {"var1, ...var2", "function f1() { var2 = 9; }", SKIP_STRICT_FUNCTION},
486

487
      // Default parameters.
488 489 490 491
      {"var1 = 3", "", SKIP_STRICT_FUNCTION, PreciseMaybeAssigned::NO},
      {"var1, var2 = var1", "", SKIP_STRICT_FUNCTION, PreciseMaybeAssigned::NO},
      {"var1, var2 = 4, ...var3", "", SKIP_STRICT_FUNCTION,
       PreciseMaybeAssigned::NO},
492 493 494

      // Destructuring parameters. Because of the search space explosion, we
      // cannot test all interesting cases. Let's try to test a relevant subset.
495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511
      {"[]", "", SKIP_STRICT_FUNCTION},
      {"{}", "", SKIP_STRICT_FUNCTION},

      {"[var1]", "", SKIP_STRICT_FUNCTION},
      {"{name1: var1}", "", SKIP_STRICT_FUNCTION},
      {"{var1}", "", SKIP_STRICT_FUNCTION},

      {"[var1]", "var1;", SKIP_STRICT_FUNCTION},
      {"{name1: var1}", "var1;", SKIP_STRICT_FUNCTION},
      {"{name1: var1}", "name1;", SKIP_STRICT_FUNCTION},
      {"{var1}", "var1;", SKIP_STRICT_FUNCTION},

      {"[var1]", "var1 = 16;", SKIP_STRICT_FUNCTION},
      {"{name1: var1}", "var1 = 16;", SKIP_STRICT_FUNCTION},
      {"{name1: var1}", "name1 = 16;", SKIP_STRICT_FUNCTION},
      {"{var1}", "var1 = 16;", SKIP_STRICT_FUNCTION},

512 513 514 515
      {"[var1]", "() => { var1; };", SKIP_STRICT_FUNCTION},
      {"{name1: var1}", "() => { var1; };", SKIP_STRICT_FUNCTION},
      {"{name1: var1}", "() => { name1; };", SKIP_STRICT_FUNCTION},
      {"{var1}", "() => { var1; };", SKIP_STRICT_FUNCTION},
516 517 518 519 520

      {"[var1, var2, var3]", "", SKIP_STRICT_FUNCTION},
      {"{name1: var1, name2: var2, name3: var3}", "", SKIP_STRICT_FUNCTION},
      {"{var1, var2, var3}", "", SKIP_STRICT_FUNCTION},

521 522
      {"[var1, var2, var3]", "() => { var2 = 16;};", SKIP_STRICT_FUNCTION},
      {"{name1: var1, name2: var2, name3: var3}", "() => { var2 = 16;};",
523
       SKIP_STRICT_FUNCTION},
524
      {"{name1: var1, name2: var2, name3: var3}", "() => { name2 = 16;};",
525
       SKIP_STRICT_FUNCTION},
526
      {"{var1, var2, var3}", "() => { var2 = 16;};", SKIP_STRICT_FUNCTION},
527 528

      // Nesting destructuring.
529 530
      {"[var1, [var2, var3], {var4, name5: [var5, var6]}]", "",
       SKIP_STRICT_FUNCTION},
531 532

      // Complicated params.
533 534
      {"var1, [var2], var3 = 24, [var4, var5] = [2, 4], var6, {var7}, var8, "
       "{name9: var9, name10: var10}, ...var11",
535
       "", SKIP_STRICT_FUNCTION, PreciseMaybeAssigned::NO},
536

537
      // Complicated cases from bugs.
538
      {"var1 = {} = {}", "", SKIP_STRICT_FUNCTION, PreciseMaybeAssigned::NO},
539

540
      // Destructuring rest. Because we can.
541
      {"var1, ...[var2]", "", SKIP_STRICT_FUNCTION},
542
      {"var1, ...[var2]", "() => { var2; };", SKIP_STRICT_FUNCTION},
543
      {"var1, ...{0: var2}", "", SKIP_STRICT_FUNCTION},
544
      {"var1, ...{0: var2}", "() => { var2; };", SKIP_STRICT_FUNCTION},
545 546 547 548
      {"var1, ...[]", "", SKIP_STRICT_FUNCTION},
      {"var1, ...{}", "", SKIP_STRICT_FUNCTION},
      {"var1, ...[var2, var3]", "", SKIP_STRICT_FUNCTION},
      {"var1, ...{0: var2, 1: var3}", "", SKIP_STRICT_FUNCTION},
549 550

      // Default parameters for destruring parameters.
551 552 553 554
      {"[var1, var2] = [2, 4]", "", SKIP_STRICT_FUNCTION,
       PreciseMaybeAssigned::NO},
      {"{var1, var2} = {var1: 3, var2: 3}", "", SKIP_STRICT_FUNCTION,
       PreciseMaybeAssigned::NO},
555 556

      // Default parameters inside destruring parameters.
557 558 559 560
      {"[var1 = 4, var2 = var1]", "", SKIP_STRICT_FUNCTION,
       PreciseMaybeAssigned::NO},
      {"{var1 = 4, var2 = var1}", "", SKIP_STRICT_FUNCTION,
       PreciseMaybeAssigned::NO},
561 562

      // Locals shadowing parameters.
563
      {"var1, var2", "var var1 = 16; () => { var1 = 17; };"},
564 565

      // Locals shadowing destructuring parameters and the rest parameter.
566
      {"[var1, var2]", "var var1 = 16; () => { var1 = 17; };",
567
       SKIP_STRICT_FUNCTION},
568
      {"{var1, var2}", "var var1 = 16; () => { var1 = 17; };",
569
       SKIP_STRICT_FUNCTION},
570
      {"var1, var2, ...var3", "var var3 = 16; () => { var3 = 17; };",
571
       SKIP_STRICT_FUNCTION},
572
      {"var1, var2 = var1", "var var1 = 16; () => { var1 = 17; };",
573
       SKIP_STRICT_FUNCTION, PreciseMaybeAssigned::NO},
574 575

      // Hoisted sloppy block function shadowing a parameter.
576
      // FIXME(marja): why is maybe_assigned inaccurate?
577 578
      {"var1, var2", "for (;;) { function var1() { } }", DONT_SKIP,
       PreciseMaybeAssigned::NO},
579

580
      // Sloppy eval in default parameter.
581
      {"var1, var2 = eval(''), var3", "let var4 = 0;", SKIP_STRICT_FUNCTION,
582
       Bailout::BAILOUT_IF_OUTER_SLOPPY},
583
      {"var1, var2 = eval(''), var3 = eval('')", "let var4 = 0;",
584
       SKIP_STRICT_FUNCTION, Bailout::BAILOUT_IF_OUTER_SLOPPY},
585

586 587
      // Sloppy eval in arrow function parameter list which is inside another
      // arrow function parameter list.
588
      {"var1, var2 = (var3, var4 = eval(''), var5) => { let var6; }, var7",
589 590 591 592
       "let var8 = 0;", SKIP_STRICT_FUNCTION, Bailout::BAILOUT_IF_OUTER_SLOPPY},

      // Sloppy eval in a function body with non-simple parameters.
      {"var1 = 1, var2 = 2", "eval('');", SKIP_STRICT_FUNCTION},
593 594 595 596 597 598 599

      // Catch variable
      {"try { } catch(var1) { }"},
      {"try { } catch(var1) { var1; }"},
      {"try { } catch(var1) { var1 = 3; }"},
      {"try { } catch(var1) { function f() { var1; } }"},
      {"try { } catch(var1) { function f() { var1 = 3; } }"},
600 601 602 603 604

      {"try { } catch({var1, var2}) { function f() { var1 = 3; } }"},
      {"try { } catch([var1, var2]) { function f() { var1 = 3; } }"},
      {"try { } catch({}) { }"},
      {"try { } catch([]) { }"},
605 606 607 608

      // Shadowing the catch variable
      {"try { } catch(var1) { var var1 = 3; }"},
      {"try { } catch(var1) { var var1 = 3; function f() { var1 = 3; } }"},
609 610 611

      // Classes
      {"class MyClass {}"},
612 613 614 615 616 617 618
      {"var1 = class MyClass {};"},
      {"var var1 = class MyClass {};"},
      {"let var1 = class MyClass {};"},
      {"const var1 = class MyClass {};"},
      {"var var1 = class {};"},
      {"let var1 = class {};"},
      {"const var1 = class {};"},
619

620 621 622 623 624 625
      {"class MyClass { constructor() {} }"},
      {"class MyClass { constructor() { var var1; } }"},
      {"class MyClass { constructor() { var var1 = 11; } }"},
      {"class MyClass { constructor() { var var1; function foo() { var1 = 11; "
       "} } }"},

626 627 628 629 630 631 632 633 634 635
      {"class MyClass { m() {} }"},
      {"class MyClass { m() { var var1; } }"},
      {"class MyClass { m() { var var1 = 11; } }"},
      {"class MyClass { m() { var var1; function foo() { var1 = 11; } } }"},

      {"class MyClass { static m() {} }"},
      {"class MyClass { static m() { var var1; } }"},
      {"class MyClass { static m() { var var1 = 11; } }"},
      {"class MyClass { static m() { var var1; function foo() { var1 = 11; } } "
       "}"},
636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657

      {"class MyBase {} class MyClass extends MyBase {}"},
      {"class MyClass extends MyBase { constructor() {} }"},
      {"class MyClass extends MyBase { constructor() { super(); } }"},
      {"class MyClass extends MyBase { constructor() { var var1; } }"},
      {"class MyClass extends MyBase { constructor() { var var1 = 11; } }"},
      {"class MyClass extends MyBase { constructor() { var var1; function "
       "foo() { var1 = 11; } } }"},

      {"class MyClass extends MyBase { m() {} }"},
      {"class MyClass extends MyBase { m() { super.foo; } }"},
      {"class MyClass extends MyBase { m() { var var1; } }"},
      {"class MyClass extends MyBase { m() { var var1 = 11; } }"},
      {"class MyClass extends MyBase { m() { var var1; function foo() { var1 = "
       "11; } } }"},

      {"class MyClass extends MyBase { static m() {} }"},
      {"class MyClass extends MyBase { static m() { super.foo; } }"},
      {"class MyClass extends MyBase { static m() { var var1; } }"},
      {"class MyClass extends MyBase { static m() { var var1 = 11; } }"},
      {"class MyClass extends MyBase { static m() { var var1; function foo() { "
       "var1 = 11; } } }"},
658

659 660 661 662 663
      {"class X { ['bar'] = 1; }; new X;"},
      {"class X { static ['foo'] = 2; }; new X;"},
      {"class X { ['bar'] = 1; static ['foo'] = 2; }; new X;"},
      {"class X { #x = 1 }; new X;"},
      {"function t() { return class { #x = 1 }; } new t();"},
664 665
  };

666 667 668 669 670 671
  for (unsigned i = 0; i < arraysize(outers); ++i) {
    struct Outer outer = outers[i];
    for (unsigned j = 0; j < arraysize(inners); ++j) {
      struct Inner inner = inners[j];
      if (outer.strict_outer && (inner.skip & SKIP_STRICT_OUTER)) continue;
      if (outer.strict_test_function && (inner.skip & SKIP_STRICT_FUNCTION)) {
672 673
        continue;
      }
674
      if (outer.arrow && (inner.skip & SKIP_ARROW)) continue;
675

676
      const char* code = outer.code;
677
      int code_len = Utf8LengthHelper(code);
678

679 680
      int params_len = Utf8LengthHelper(inner.params);
      int source_len = Utf8LengthHelper(inner.source);
681
      int len = code_len + params_len + source_len;
682

683
      i::ScopedVector<char> program(len + 1);
684
      i::SNPrintF(program, code, inner.params, inner.source);
685

686 687
      i::HandleScope scope(isolate);

688
      i::Handle<i::String> source =
689
          factory->InternalizeUtf8String(program.begin());
690 691 692
      source->PrintOn(stdout);
      printf("\n");

693
      // Compile and run the script to get a pointer to the lazy function.
694
      v8::Local<v8::Value> v = CompileRun(program.begin());
695 696
      i::Handle<i::Object> o = v8::Utils::OpenHandle(*v);
      i::Handle<i::JSFunction> f = i::Handle<i::JSFunction>::cast(o);
697
      i::Handle<i::SharedFunctionInfo> shared = i::handle(f->shared(), isolate);
698

699 700
      if (inner.bailout == Bailout::BAILOUT_IF_OUTER_SLOPPY &&
          !outer.strict_outer) {
701
        CHECK(!shared->HasUncompiledDataWithPreparseData());
702 703
        continue;
      }
704

705 706
      CHECK(shared->HasUncompiledDataWithPreparseData());
      i::Handle<i::PreparseData> produced_data_on_heap(
707
          shared->uncompiled_data_with_preparse_data().preparse_data(),
708
          isolate);
709 710

      // Parse the lazy function using the scope data.
711
      i::ParseInfo using_scope_data(isolate, shared);
712
      using_scope_data.set_lazy_compile();
713 714
      using_scope_data.set_consumed_preparse_data(
          i::ConsumedPreparseData::For(isolate, produced_data_on_heap));
715 716 717 718 719 720 721 722 723
      CHECK(i::parsing::ParseFunction(&using_scope_data, shared, isolate));

      // Verify that we skipped at least one function inside that scope.
      i::DeclarationScope* scope_with_skipped_functions =
          using_scope_data.literal()->scope();
      CHECK(i::ScopeTestHelper::HasSkippedFunctionInside(
          scope_with_skipped_functions));

      // Do scope allocation (based on the preparsed scope data).
724
      CHECK(i::DeclarationScope::Analyze(&using_scope_data));
725 726

      // Parse the lazy function again eagerly to produce baseline data.
727
      i::ParseInfo not_using_scope_data(isolate, shared);
728 729 730 731 732 733 734 735 736 737 738
      not_using_scope_data.set_lazy_compile();
      CHECK(i::parsing::ParseFunction(&not_using_scope_data, shared, isolate));

      // Verify that we didn't skip anything (there's no preparsed scope data,
      // so we cannot skip).
      i::DeclarationScope* scope_without_skipped_functions =
          not_using_scope_data.literal()->scope();
      CHECK(!i::ScopeTestHelper::HasSkippedFunctionInside(
          scope_without_skipped_functions));

      // Do normal scope allocation.
739
      CHECK(i::DeclarationScope::Analyze(&not_using_scope_data));
740 741 742

      // Verify that scope allocation gave the same results when parsing w/ the
      // scope data (and skipping functions), and when parsing without.
743
      i::ScopeTestHelper::CompareScopes(
744
          scope_without_skipped_functions, scope_with_skipped_functions,
745
          inner.precise_maybe_assigned == PreciseMaybeAssigned::YES);
746
    }
747 748
  }
}
749 750 751 752 753 754 755 756 757 758 759 760 761

// Regression test for
// https://bugs.chromium.org/p/chromium/issues/detail?id=753896. Should not
// crash.
TEST(Regress753896) {
  i::Isolate* isolate = CcTest::i_isolate();
  i::Factory* factory = isolate->factory();
  i::HandleScope scope(isolate);
  LocalContext env;

  i::Handle<i::String> source = factory->InternalizeUtf8String(
      "function lazy() { let v = 0; if (true) { var v = 0; } }");
  i::Handle<i::Script> script = factory->NewScript(source);
762
  i::ParseInfo info(isolate, script);
763 764 765 766 767

  // We don't assert that parsing succeeded or that it failed; currently the
  // error is not detected inside lazy functions, but it might be in the future.
  i::parsing::ParseProgram(&info, isolate);
}
768 769 770 771 772 773 774

TEST(ProducingAndConsumingByteData) {
  i::Isolate* isolate = CcTest::i_isolate();
  i::HandleScope scope(isolate);
  LocalContext env;

  i::Zone zone(isolate->allocator(), ZONE_NAME);
775 776 777
  std::vector<uint8_t> buffer;
  i::PreparseDataBuilder::ByteData bytes;
  bytes.Start(&buffer);
778 779 780 781 782 783 784 785

  bytes.Reserve(32);
  bytes.Reserve(32);
  CHECK_EQ(buffer.size(), 32);
  const int kBufferSize = 64;
  bytes.Reserve(kBufferSize);
  CHECK_EQ(buffer.size(), kBufferSize);

786
  // Write some data.
787
#ifdef DEBUG
788
  bytes.WriteUint32(1983);  // This will be overwritten.
789 790 791 792
#else
  bytes.WriteVarint32(1983);
#endif
  bytes.WriteVarint32(2147483647);
793 794
  bytes.WriteUint8(4);
  bytes.WriteUint8(255);
795
  bytes.WriteVarint32(0);
796
  bytes.WriteUint8(0);
797
#ifdef DEBUG
798 799
  bytes.SaveCurrentSizeAtFirstUint32();
  int saved_size = 21;
800 801
  CHECK_EQ(buffer.size(), kBufferSize);
  CHECK_EQ(bytes.length(), saved_size);
802
#endif
803
  bytes.WriteUint8(100);
804 805 806 807 808 809 810 811
  // Write quarter bytes between uint8s and uint32s to verify they're stored
  // correctly.
  bytes.WriteQuarter(3);
  bytes.WriteQuarter(0);
  bytes.WriteQuarter(2);
  bytes.WriteQuarter(1);
  bytes.WriteQuarter(0);
  bytes.WriteUint8(50);
812 813 814 815 816 817 818 819

  bytes.WriteQuarter(0);
  bytes.WriteQuarter(1);
  bytes.WriteQuarter(2);
  bytes.WriteQuarter(3);
  bytes.WriteVarint32(50);

  // End with a lonely quarter.
820 821 822
  bytes.WriteQuarter(0);
  bytes.WriteQuarter(1);
  bytes.WriteQuarter(2);
823 824
  bytes.WriteVarint32(0xff);

825 826
  // End with a lonely quarter.
  bytes.WriteQuarter(2);
827

828
  CHECK_EQ(buffer.size(), 64);
829
#ifdef DEBUG
830
  const int kDataSize = 42;
831
#else
832
  const int kDataSize = 21;
833
#endif
834 835
  CHECK_EQ(bytes.length(), kDataSize);
  CHECK_EQ(buffer.size(), kBufferSize);
836 837 838 839 840 841 842 843

  // Copy buffer for sanity checks later-on.
  std::vector<uint8_t> copied_buffer(buffer);

  // Move the data from the temporary buffer into the zone for later
  // serialization.
  bytes.Finalize(&zone);
  CHECK_EQ(buffer.size(), 0);
844
  CHECK_EQ(copied_buffer.size(), kBufferSize);
845

846
  {
847
    // Serialize as a ZoneConsumedPreparseData, and read back data.
848
    i::ZonePreparseData* data_in_zone = bytes.CopyToZone(&zone, 0);
849
    i::ZoneConsumedPreparseData::ByteData bytes_for_reading;
850
    i::ZoneVectorWrapper wrapper(data_in_zone->byte_data());
851
    i::ZoneConsumedPreparseData::ByteData::ReadingScope reading_scope(
852
        &bytes_for_reading, wrapper);
853

854 855 856
    CHECK_EQ(wrapper.data_length(), kDataSize);

    for (int i = 0; i < kDataSize; i++) {
857 858 859
      CHECK_EQ(copied_buffer.at(i), wrapper.get(i));
    }

860
#ifdef DEBUG
861
    CHECK_EQ(bytes_for_reading.ReadUint32(), saved_size);
862
#else
863
    CHECK_EQ(bytes_for_reading.ReadVarint32(), 1983);
864
#endif
865
    CHECK_EQ(bytes_for_reading.ReadVarint32(), 2147483647);
866 867
    CHECK_EQ(bytes_for_reading.ReadUint8(), 4);
    CHECK_EQ(bytes_for_reading.ReadUint8(), 255);
868
    CHECK_EQ(bytes_for_reading.ReadVarint32(), 0);
869 870
    CHECK_EQ(bytes_for_reading.ReadUint8(), 0);
    CHECK_EQ(bytes_for_reading.ReadUint8(), 100);
871

872 873 874 875 876 877
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 3);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 0);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 2);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 1);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 0);
    CHECK_EQ(bytes_for_reading.ReadUint8(), 50);
878

879 880 881
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 0);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 1);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 2);
882 883 884 885 886 887 888 889
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 3);
    CHECK_EQ(bytes_for_reading.ReadVarint32(), 50);

    CHECK_EQ(bytes_for_reading.ReadQuarter(), 0);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 1);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 2);
    CHECK_EQ(bytes_for_reading.ReadVarint32(), 0xff);

890
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 2);
891 892
    // We should have consumed all data at this point.
    CHECK(!bytes_for_reading.HasRemainingBytes(1));
893 894 895
  }

  {
896
    // Serialize as an OnHeapConsumedPreparseData, and read back data.
897
    i::Handle<i::PreparseData> data_on_heap = bytes.CopyToHeap(isolate, 0);
898
    CHECK_EQ(data_on_heap->data_length(), kDataSize);
899
    CHECK_EQ(data_on_heap->children_length(), 0);
900 901
    i::OnHeapConsumedPreparseData::ByteData bytes_for_reading;
    i::OnHeapConsumedPreparseData::ByteData::ReadingScope reading_scope(
902 903
        &bytes_for_reading, *data_on_heap);

904
    for (int i = 0; i < kDataSize; i++) {
905 906 907
      CHECK_EQ(copied_buffer[i], data_on_heap->get(i));
    }

908
#ifdef DEBUG
909
    CHECK_EQ(bytes_for_reading.ReadUint32(), saved_size);
910
#else
911
    CHECK_EQ(bytes_for_reading.ReadVarint32(), 1983);
912
#endif
913
    CHECK_EQ(bytes_for_reading.ReadVarint32(), 2147483647);
914 915
    CHECK_EQ(bytes_for_reading.ReadUint8(), 4);
    CHECK_EQ(bytes_for_reading.ReadUint8(), 255);
916
    CHECK_EQ(bytes_for_reading.ReadVarint32(), 0);
917 918
    CHECK_EQ(bytes_for_reading.ReadUint8(), 0);
    CHECK_EQ(bytes_for_reading.ReadUint8(), 100);
919

920 921 922 923 924 925
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 3);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 0);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 2);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 1);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 0);
    CHECK_EQ(bytes_for_reading.ReadUint8(), 50);
926

927 928 929
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 0);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 1);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 2);
930 931 932 933 934 935 936 937
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 3);
    CHECK_EQ(bytes_for_reading.ReadVarint32(), 50);

    CHECK_EQ(bytes_for_reading.ReadQuarter(), 0);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 1);
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 2);
    CHECK_EQ(bytes_for_reading.ReadVarint32(), 0xff);

938
    CHECK_EQ(bytes_for_reading.ReadQuarter(), 2);
939 940
    // We should have consumed all data at this point.
    CHECK(!bytes_for_reading.HasRemainingBytes(1));
941
  }
942
}