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[es6] Initial support for let/const bindings in sloppy mode

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Allow let in sloppy mode with --harmony-sloppy

Allow ES'15 const in sloppy mode with --harmony-sloppy --no-legacy-const

Functions in block are not done yet. They are only let bound in the block
at this point.

BUG=v8:3305, v8:2198
LOG=N
R=littledan@chromium.org, rossberg@chromium.org, adamk@chromium.org

Review URL: https://codereview.chromium.org/1219853004

Cr-Commit-Position: refs/heads/master@{#29536}
This commit is contained in:
arv 2015-07-08 08:04:04 -07:00 committed by Commit bot
parent 7fc183af06
commit 3b1aabc960
13 changed files with 1788 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
src/parser.cc
View File

@ -1387,7 +1387,7 @@ Statement* Parser::ParseStatementListItem(bool* ok) {
case Token::VAR: case Token::VAR:
return ParseVariableStatement(kStatementListItem, NULL, ok); return ParseVariableStatement(kStatementListItem, NULL, ok);
case Token::LET: case Token::LET:
if (is_strict(language_mode())) { if (allow_let()) {
return ParseVariableStatement(kStatementListItem, NULL, ok); return ParseVariableStatement(kStatementListItem, NULL, ok);
} }
break; break;
@ -2049,7 +2049,7 @@ Variable* Parser::Declare(Declaration* declaration,
// because the var declaration is hoisted to the function scope where 'x' // because the var declaration is hoisted to the function scope where 'x'
// is already bound. // is already bound.
DCHECK(IsDeclaredVariableMode(var->mode())); DCHECK(IsDeclaredVariableMode(var->mode()));
if (is_strict(language_mode())) { if (is_strict(language_mode()) || allow_harmony_sloppy()) {
// In harmony we treat re-declarations as early errors. See // In harmony we treat re-declarations as early errors. See
// ES5 16 for a definition of early errors. // ES5 16 for a definition of early errors.
if (declaration_kind == DeclarationDescriptor::NORMAL) { if (declaration_kind == DeclarationDescriptor::NORMAL) {
@ -2207,7 +2207,7 @@ Statement* Parser::ParseFunctionDeclaration(
VariableMode mode = VariableMode mode =
is_strong(language_mode()) is_strong(language_mode())
? CONST ? CONST
: is_strict(language_mode()) && : (is_strict(language_mode()) || allow_harmony_sloppy()) &&
!(scope_->is_script_scope() || scope_->is_eval_scope() || !(scope_->is_script_scope() || scope_->is_eval_scope() ||
scope_->is_function_scope()) scope_->is_function_scope())
? LET ? LET
@ -2287,7 +2287,7 @@ Statement* Parser::ParseClassDeclaration(ZoneList<const AstRawString*>* names,
Block* Parser::ParseBlock(ZoneList<const AstRawString*>* labels, bool* ok) { Block* Parser::ParseBlock(ZoneList<const AstRawString*>* labels, bool* ok) {
if (is_strict(language_mode())) { if (is_strict(language_mode()) || allow_harmony_sloppy()) {
return ParseScopedBlock(labels, ok); return ParseScopedBlock(labels, ok);
} }
@ -2439,14 +2439,14 @@ void Parser::ParseVariableDeclarations(VariableDeclarationContext var_context,
parsing_result->descriptor.init_op = Token::INIT_CONST_LEGACY; parsing_result->descriptor.init_op = Token::INIT_CONST_LEGACY;
++use_counts_[v8::Isolate::kLegacyConst]; ++use_counts_[v8::Isolate::kLegacyConst];
} else { } else {
DCHECK(is_strict(language_mode())); DCHECK(is_strict(language_mode()) || allow_harmony_sloppy());
DCHECK(var_context != kStatement); DCHECK(var_context != kStatement);
parsing_result->descriptor.mode = CONST; parsing_result->descriptor.mode = CONST;
parsing_result->descriptor.init_op = Token::INIT_CONST; parsing_result->descriptor.init_op = Token::INIT_CONST;
} }
parsing_result->descriptor.is_const = true; parsing_result->descriptor.is_const = true;
parsing_result->descriptor.needs_init = true; parsing_result->descriptor.needs_init = true;
} else if (peek() == Token::LET && is_strict(language_mode())) { } else if (peek() == Token::LET && allow_let()) {
Consume(Token::LET); Consume(Token::LET);
DCHECK(var_context != kStatement); DCHECK(var_context != kStatement);
parsing_result->descriptor.mode = LET; parsing_result->descriptor.mode = LET;
@ -3498,7 +3498,7 @@ Statement* Parser::ParseForStatement(ZoneList<const AstRawString*>* labels,
DeclarationParsingResult parsing_result; DeclarationParsingResult parsing_result;
if (peek() != Token::SEMICOLON) { if (peek() != Token::SEMICOLON) {
if (peek() == Token::VAR || (peek() == Token::CONST && allow_const()) || if (peek() == Token::VAR || (peek() == Token::CONST && allow_const()) ||
(peek() == Token::LET && is_strict(language_mode()))) { (peek() == Token::LET && allow_let())) {
ParseVariableDeclarations(kForStatement, &parsing_result, CHECK_OK); ParseVariableDeclarations(kForStatement, &parsing_result, CHECK_OK);
is_const = parsing_result.descriptor.mode == CONST; is_const = parsing_result.descriptor.mode == CONST;
@ -3973,6 +3973,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(
Scope* original_declaration_scope = original_scope_->DeclarationScope(); Scope* original_declaration_scope = original_scope_->DeclarationScope();
Scope* scope = function_type == FunctionLiteral::DECLARATION && Scope* scope = function_type == FunctionLiteral::DECLARATION &&
is_sloppy(language_mode()) && is_sloppy(language_mode()) &&
!allow_harmony_sloppy() &&
(original_scope_ == original_declaration_scope || (original_scope_ == original_declaration_scope ||
declaration_scope != original_declaration_scope) declaration_scope != original_declaration_scope)
? NewScope(declaration_scope, FUNCTION_SCOPE, kind) ? NewScope(declaration_scope, FUNCTION_SCOPE, kind)
@ -4030,11 +4031,12 @@ FunctionLiteral* Parser::ParseFunctionLiteral(
Variable* fvar = NULL; Variable* fvar = NULL;
Token::Value fvar_init_op = Token::INIT_CONST_LEGACY; Token::Value fvar_init_op = Token::INIT_CONST_LEGACY;
if (function_type == FunctionLiteral::NAMED_EXPRESSION) { if (function_type == FunctionLiteral::NAMED_EXPRESSION) {
if (is_strict(language_mode())) { bool use_strict_const = is_strict(language_mode()) ||
(!allow_legacy_const() && allow_harmony_sloppy());
if (use_strict_const) {
fvar_init_op = Token::INIT_CONST; fvar_init_op = Token::INIT_CONST;
} }
VariableMode fvar_mode = VariableMode fvar_mode = use_strict_const ? CONST : CONST_LEGACY;
is_strict(language_mode()) ? CONST : CONST_LEGACY;
DCHECK(function_name != NULL); DCHECK(function_name != NULL);
fvar = new (zone()) fvar = new (zone())
Variable(scope_, function_name, fvar_mode, Variable::NORMAL, Variable(scope_, function_name, fvar_mode, Variable::NORMAL,

11
src/preparser.cc
View File

@ -197,7 +197,7 @@ PreParser::Statement PreParser::ParseStatementListItem(bool* ok) {
} }
break; break;
case Token::LET: case Token::LET:
if (is_strict(language_mode())) { if (allow_let()) {
return ParseVariableStatement(kStatementListItem, ok); return ParseVariableStatement(kStatementListItem, ok);
} }
break; break;
@ -456,7 +456,7 @@ PreParser::Statement PreParser::ParseBlock(bool* ok) {
Expect(Token::LBRACE, CHECK_OK); Expect(Token::LBRACE, CHECK_OK);
Statement final = Statement::Default(); Statement final = Statement::Default();
while (peek() != Token::RBRACE) { while (peek() != Token::RBRACE) {
if (is_strict(language_mode())) { if (is_strict(language_mode()) || allow_harmony_sloppy()) {
final = ParseStatementListItem(CHECK_OK); final = ParseStatementListItem(CHECK_OK);
} else { } else {
final = ParseStatement(CHECK_OK); final = ParseStatement(CHECK_OK);
@ -524,12 +524,13 @@ PreParser::Statement PreParser::ParseVariableDeclarations(
// existing pages. Therefore we keep allowing const with the old // existing pages. Therefore we keep allowing const with the old
// non-harmony semantics in sloppy mode. // non-harmony semantics in sloppy mode.
Consume(Token::CONST); Consume(Token::CONST);
if (is_strict(language_mode())) { if (is_strict(language_mode()) ||
(allow_harmony_sloppy() && !allow_legacy_const())) {
DCHECK(var_context != kStatement); DCHECK(var_context != kStatement);
is_strict_const = true; is_strict_const = true;
require_initializer = var_context != kForStatement; require_initializer = var_context != kForStatement;
} }
} else if (peek() == Token::LET && is_strict(language_mode())) { } else if (peek() == Token::LET && allow_let()) {
Consume(Token::LET); Consume(Token::LET);
DCHECK(var_context != kStatement); DCHECK(var_context != kStatement);
} else { } else {
@ -869,7 +870,7 @@ PreParser::Statement PreParser::ParseForStatement(bool* ok) {
if (peek() != Token::SEMICOLON) { if (peek() != Token::SEMICOLON) {
ForEachStatement::VisitMode mode; ForEachStatement::VisitMode mode;
if (peek() == Token::VAR || (peek() == Token::CONST && allow_const()) || if (peek() == Token::VAR || (peek() == Token::CONST && allow_const()) ||
(peek() == Token::LET && is_strict(language_mode()))) { (peek() == Token::LET && allow_let())) {
int decl_count; int decl_count;
Scanner::Location first_initializer_loc = Scanner::Location::invalid(); Scanner::Location first_initializer_loc = Scanner::Location::invalid();
Scanner::Location bindings_loc = Scanner::Location::invalid(); Scanner::Location bindings_loc = Scanner::Location::invalid();

7
src/preparser.h
View File

@ -494,7 +494,12 @@ class ParserBase : public Traits {
bool is_generator() const { return function_state_->is_generator(); } bool is_generator() const { return function_state_->is_generator(); }
bool allow_const() { bool allow_const() {
return is_strict(language_mode()) || allow_legacy_const(); return is_strict(language_mode()) || allow_harmony_sloppy() ||
allow_legacy_const();
}
bool allow_let() {
return is_strict(language_mode()) || allow_harmony_sloppy();
} }
// Report syntax errors. // Report syntax errors.

52
test/cctest/test-parsing.cc
View File

@ -6766,7 +6766,7 @@ TEST(NewTarget) {
} }
TEST(LegacyConst) { TEST(ConstLegacy) {
// clang-format off // clang-format off
const char* context_data[][2] = { const char* context_data[][2] = {
{"", ""}, {"", ""},
@ -6784,9 +6784,57 @@ TEST(LegacyConst) {
}; };
// clang-format on // clang-format on
static const ParserFlag always_flags[] = {kNoLegacyConst};
static const ParserFlag always_flags[] = {kNoLegacyConst};
RunParserSyncTest(context_data, data, kError, NULL, 0, always_flags, RunParserSyncTest(context_data, data, kError, NULL, 0, always_flags,
arraysize(always_flags)); arraysize(always_flags));
RunParserSyncTest(context_data, data, kSuccess); RunParserSyncTest(context_data, data, kSuccess);
} }
TEST(ConstSloppy) {
// clang-format off
const char* context_data[][2] = {
{"", ""},
{"{", "}"},
{NULL, NULL}
};
const char* data[] = {
"const x = 1",
"for (const x = 1; x < 1; x++) {}",
"for (const x in {}) {}",
"for (const x of []) {}",
NULL
};
// clang-format on
static const ParserFlag always_flags[] = {kAllowHarmonySloppy,
kNoLegacyConst};
RunParserSyncTest(context_data, data, kSuccess, NULL, 0, always_flags,
arraysize(always_flags));
}
TEST(LetSloppy) {
// clang-format off
const char* context_data[][2] = {
{"", ""},
{"'use strict';", ""},
{"{", "}"},
{NULL, NULL}
};
const char* data[] = {
"let x",
"let x = 1",
"for (let x = 1; x < 1; x++) {}",
"for (let x in {}) {}",
"for (let x of []) {}",
NULL
};
// clang-format on
static const ParserFlag always_flags[] = {kAllowHarmonySloppy};
RunParserSyncTest(context_data, data, kSuccess, NULL, 0, always_flags,
arraysize(always_flags));
}

2
test/mjsunit/es6/block-leave.js
View File

@ -175,7 +175,7 @@ try {
// Verify that the context is correctly set in the stack frame after exiting // Verify that the context is correctly set in the stack frame after exiting
// from with. // from eval.
function f() {} function f() {}
(function(x) { (function(x) {

159
test/mjsunit/harmony/block-const-assign-sloppy.js Normal file
View File

@ -0,0 +1,159 @@
// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Flags: --harmony-computed-property-names
// Flags: --no-legacy-const --harmony-sloppy
// Test that we throw early syntax errors in harmony mode
// when using an immutable binding in an assigment or with
// prefix/postfix decrement/increment operators.
const decls = [
// Const declaration.
function(use) { return "const c = 1; " + use + ";" }, TypeError,
function(use) { return "const x = 0, c = 1; " + use + ";" }, TypeError,
function(use) { return "const c = 1, x = (" + use + ");" }, TypeError,
function(use) { return use + "; const c = 1;" }, ReferenceError,
function(use) { return use + "; const x = 0, c = 1;" }, ReferenceError,
function(use) { return "const x = (" + use + "), c = 1;" }, ReferenceError,
function(use) { return "const c = (" + use + ");" }, ReferenceError,
// Function expression.
function(use) { return "(function c() { " + use + "; })();"; }, TypeError,
// TODO(rossberg): Once we have default parameters, test using 'c' there.
// Class expression.
function(use) {
return "new class c { constructor() { " + use + " } };";
}, TypeError,
function(use) {
return "(new class c { m() { " + use + " } }).m();";
}, TypeError,
function(use) {
return "(new class c { get a() { " + use + " } }).a;";
}, TypeError,
function(use) {
return "(new class c { set a(x) { " + use + " } }).a = 0;";
}, TypeError,
function(use) {
return "(class c { static m() { " + use + " } }).s();";
}, TypeError,
function(use) {
return "(class c extends (" + use + ") {});";
}, ReferenceError,
function(use) {
return "(class c { [" + use + "]() {} });";
}, ReferenceError,
function(use) {
return "(class c { get [" + use + "]() {} });";
}, ReferenceError,
function(use) {
return "(class c { set [" + use + "](x) {} });";
}, ReferenceError,
function(use) {
return "(class c { static [" + use + "]() {} });";
}, ReferenceError,
// For loop.
function(use) {
return "for (const c = 0; " + use + ";) {}"
}, TypeError,
function(use) {
return "for (const x = 0, c = 0; " + use + ";) {}"
}, TypeError,
function(use) {
return "for (const c = 0; ; " + use + ") {}"
}, TypeError,
function(use) {
return "for (const x = 0, c = 0; ; " + use + ") {}"
}, TypeError,
function(use) {
return "for (const c = 0; ;) { " + use + "; }"
}, TypeError,
function(use) {
return "for (const x = 0, c = 0; ;) { " + use + "; }"
}, TypeError,
function(use) {
return "for (const c in {a: 1}) { " + use + "; }"
}, TypeError,
function(use) {
return "for (const c of [1]) { " + use + "; }"
}, TypeError,
function(use) {
return "for (const x = (" + use + "), c = 0; ;) {}"
}, ReferenceError,
function(use) {
return "for (const c = (" + use + "); ;) {}"
}, ReferenceError,
]
let uses = [
'c = 1',
'c += 1',
'++c',
'c--',
];
let declcontexts = [
function(decl) { return decl; },
function(decl) { return "eval(\'" + decl + "\')"; },
function(decl) { return "{ " + decl + " }"; },
function(decl) { return "(function() { " + decl + " })()"; },
];
let usecontexts = [
function(use) { return use; },
function(use) { return "eval(\"" + use + "\")"; },
function(use) { return "(function() { " + use + " })()"; },
function(use) { return "(function() { eval(\"" + use + "\"); })()"; },
function(use) { return "eval(\"(function() { " + use + "; })\")()"; },
];
function Test(program, error) {
program = "'use strict'; " + program;
try {
print(program, " // throw " + error.name);
eval(program);
} catch (e) {
assertInstanceof(e, error);
if (e === TypeError) {
assertTrue(e.toString().indexOf("Assignment to constant variable") >= 0);
}
return;
}
assertUnreachable();
}
for (var d = 0; d < decls.length; d += 2) {
for (var u = 0; u < uses.length; ++u) {
for (var o = 0; o < declcontexts.length; ++o) {
for (var i = 0; i < usecontexts.length; ++i) {
Test(declcontexts[o](decls[d](usecontexts[i](uses[u]))), decls[d + 1]);
}
}
}
}

199
test/mjsunit/harmony/block-for-sloppy.js Normal file
View File

@ -0,0 +1,199 @@
// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Flags: --no-legacy-const --harmony-sloppy
function props(x) {
var array = [];
for (let p in x) array.push(p);
return array.sort();
}
assertEquals(0, props({}).length);
assertEquals(1, props({x:1}).length);
assertEquals(2, props({x:1, y:2}).length);
assertArrayEquals(["x"], props({x:1}));
assertArrayEquals(["x", "y"], props({x:1, y:2}));
assertArrayEquals(["x", "y", "zoom"], props({x:1, y:2, zoom:3}));
assertEquals(0, props([]).length);
assertEquals(1, props([1]).length);
assertEquals(2, props([1,2]).length);
assertArrayEquals(["0"], props([1]));
assertArrayEquals(["0", "1"], props([1,2]));
assertArrayEquals(["0", "1", "2"], props([1,2,3]));
var o = {};
var a = [];
let i = "outer_i";
let s = "outer_s";
for (let i = 0x0020; i < 0x01ff; i+=2) {
let s = 'char:' + String.fromCharCode(i);
a.push(s);
o[s] = i;
}
assertArrayEquals(a, props(o));
assertEquals(i, "outer_i");
assertEquals(s, "outer_s");
var a = [];
assertEquals(0, props(a).length);
a[Math.pow(2,30)-1] = 0;
assertEquals(1, props(a).length);
a[Math.pow(2,31)-1] = 0;
assertEquals(2, props(a).length);
a[1] = 0;
assertEquals(3, props(a).length);
var result = '';
for (let p in {a : [0], b : 1}) { result += p; }
assertEquals('ab', result);
var result = '';
for (let p in {a : {v:1}, b : 1}) { result += p; }
assertEquals('ab', result);
var result = '';
for (let p in { get a() {}, b : 1}) { result += p; }
assertEquals('ab', result);
var result = '';
for (let p in { get a() {}, set a(x) {}, b : 1}) { result += p; }
assertEquals('ab', result);
// Check that there is exactly one variable without initializer
// in a for-in statement with let variables.
assertThrows("function foo() { 'use strict'; for (let in {}) { } }", SyntaxError);
assertThrows("function foo() { 'use strict'; for (let x = 3 in {}) { } }", SyntaxError);
assertThrows("function foo() { 'use strict'; for (let x, y in {}) { } }", SyntaxError);
assertThrows("function foo() { 'use strict'; for (let x = 3, y in {}) { } }", SyntaxError);
assertThrows("function foo() { 'use strict'; for (let x, y = 4 in {}) { } }", SyntaxError);
assertThrows("function foo() { 'use strict'; for (let x = 3, y = 4 in {}) { } }", SyntaxError);
// In a normal for statement the iteration variable is
// freshly allocated for each iteration.
function closures1() {
let a = [];
for (let i = 0; i < 5; ++i) {
a.push(function () { return i; });
}
for (let j = 0; j < 5; ++j) {
assertEquals(j, a[j]());
}
}
closures1();
function closures2() {
let a = [], b = [];
for (let i = 0, j = 10; i < 5; ++i, ++j) {
a.push(function () { return i; });
b.push(function () { return j; });
}
for (let k = 0; k < 5; ++k) {
assertEquals(k, a[k]());
assertEquals(k + 10, b[k]());
}
}
closures2();
function closure_in_for_init() {
let a = [];
for (let i = 0, f = function() { return i }; i < 5; ++i) {
a.push(f);
}
for (let k = 0; k < 5; ++k) {
assertEquals(0, a[k]());
}
}
closure_in_for_init();
function closure_in_for_cond() {
let a = [];
for (let i = 0; a.push(function () { return i; }), i < 5; ++i) { }
for (let k = 0; k < 5; ++k) {
assertEquals(k, a[k]());
}
}
closure_in_for_cond();
function closure_in_for_next() {
let a = [];
for (let i = 0; i < 5; a.push(function () { return i; }), ++i) { }
for (let k = 0; k < 5; ++k) {
assertEquals(k + 1, a[k]());
}
}
closure_in_for_next();
// In a for-in statement the iteration variable is fresh
// for each iteration.
function closures3(x) {
let a = [];
for (let p in x) {
a.push(function () { return p; });
}
let k = 0;
for (let q in x) {
assertEquals(q, a[k]());
++k;
}
}
closures3({a : [0], b : 1, c : {v : 1}, get d() {}, set e(x) {}});
// Check normal for statement completion values.
assertEquals(1, eval("for (let i = 0; i < 10; i++) { 1; }"));
assertEquals(9, eval("for (let i = 0; i < 10; i++) { i; }"));
assertEquals(undefined, eval("for (let i = 0; false;) { }"));
assertEquals(undefined, eval("for (const i = 0; false;) { }"));
assertEquals(undefined, eval("for (let i = 0; i < 10; i++) { }"));
assertEquals(undefined, eval("for (let i = 0; false;) { i; }"));
assertEquals(undefined, eval("for (const i = 0; false;) { i; }"));
assertEquals(undefined, eval("for (let i = 0; true;) { break; }"));
assertEquals(undefined, eval("for (const i = 0; true;) { break; }"));
assertEquals(undefined, eval("for (let i = 0; i < 10; i++) { continue; }"));
assertEquals(undefined, eval("for (let i = 0; true;) { break; i; }"));
assertEquals(undefined, eval("for (const i = 0; true;) { break; i; }"));
assertEquals(undefined, eval("for (let i = 0; i < 10; i++) { continue; i; }"));
assertEquals(0, eval("for (let i = 0; true;) { i; break; }"));
assertEquals(0, eval("for (const i = 0; true;) { i; break; }"));
assertEquals(9, eval("for (let i = 0; i < 10; i++) { i; continue; }"));
assertEquals(3, eval("for (let i = 0; true; i++) { i; if (i >= 3) break; }"));
assertEquals(2, eval("for (let i = 0; true; i++) { if (i >= 3) break; i; }"));
assertEquals(
2, eval("for (let i = 0; i < 10; i++) { if (i >= 3) continue; i; }"));
assertEquals(undefined, eval("foo: for (let i = 0; true;) { break foo; }"));
assertEquals(undefined, eval("foo: for (const i = 0; true;) { break foo; }"));
assertEquals(3, eval("foo: for (let i = 3; true;) { i; break foo; }"));

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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Flags: --no-legacy-const --harmony-sloppy
// We want to test the context chain shape. In each of the tests cases
// below, the outer with is to force a runtime lookup of the identifier 'x'
// to actually verify that the inner context has been discarded. A static
// lookup of 'x' might accidentally succeed.
{
let x = 2;
L: {
let x = 3;
assertEquals(3, x);
break L;
assertTrue(false);
}
assertEquals(2, x);
}
do {
let x = 4;
assertEquals(4,x);
{
let x = 5;
assertEquals(5, x);
continue;
assertTrue(false);
}
} while (false);
var caught = false;
try {
{
let xx = 18;
throw 25;
assertTrue(false);
}
} catch (e) {
caught = true;
assertEquals(25, e);
(function () {
try {
// NOTE: This checks that the block scope containing xx has been
// removed from the context chain.
eval('xx');
assertTrue(false); // should not reach here
} catch (e2) {
assertTrue(e2 instanceof ReferenceError);
}
})();
}
assertTrue(caught);
(function(x) {
label: {
let x = 'inner';
break label;
}
assertEquals('outer', eval('x'));
})('outer');
(function(x) {
label: {
let x = 'middle';
{
let x = 'inner';
break label;
}
}
assertEquals('outer', eval('x'));
})('outer');
(function(x) {
for (var i = 0; i < 10; ++i) {
let x = 'inner' + i;
continue;
}
assertEquals('outer', eval('x'));
})('outer');
(function(x) {
label: for (var i = 0; i < 10; ++i) {
let x = 'middle' + i;
for (var j = 0; j < 10; ++j) {
let x = 'inner' + j;
continue label;
}
}
assertEquals('outer', eval('x'));
})('outer');
(function(x) {
try {
let x = 'inner';
throw 0;
} catch (e) {
assertEquals('outer', eval('x'));
}
})('outer');
(function(x) {
try {
let x = 'middle';
{
let x = 'inner';
throw 0;
}
} catch (e) {
assertEquals('outer', eval('x'));
}
})('outer');
try {
(function(x) {
try {
let x = 'inner';
throw 0;
} finally {
assertEquals('outer', eval('x'));
}
})('outer');
} catch (e) {
if (e instanceof MjsUnitAssertionError) throw e;
}
try {
(function(x) {
try {
let x = 'middle';
{
let x = 'inner';
throw 0;
}
} finally {
assertEquals('outer', eval('x'));
}
})('outer');
} catch (e) {
if (e instanceof MjsUnitAssertionError) throw e;
}
// Verify that the context is correctly set in the stack frame after exiting
// from eval.
function f() {}
(function(x) {
label: {
let x = 'inner';
break label;
}
f(); // The context could be restored from the stack after the call.
assertEquals('outer', eval('x'));
})('outer');
(function(x) {
for (var i = 0; i < 10; ++i) {
let x = 'inner';
continue;
}
f();
assertEquals('outer', eval('x'));
})('outer');
(function(x) {
try {
let x = 'inner';
throw 0;
} catch (e) {
f();
assertEquals('outer', eval('x'));
}
})('outer');
try {
(function(x) {
try {
let x = 'inner';
throw 0;
} finally {
f();
assertEquals('outer', eval('x'));
}
})('outer');
} catch (e) {
if (e instanceof MjsUnitAssertionError) throw e;
}

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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Flags: --allow-natives-syntax
// Flags: --no-legacy-const --harmony-sloppy
// Check that the following functions are optimizable.
var functions = [ f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f12, f13, f14,
f15, f16, f17, f18, f19, f20, f21, f22, f23, f24, f25, f26,
f27, f28, f29, f30, f31, f32, f33];
for (var i = 0; i < functions.length; ++i) {
var func = functions[i];
print("Testing:");
print(func);
for (var j = 0; j < 10; ++j) {
func(12);
}
%OptimizeFunctionOnNextCall(func);
func(12);
assertOptimized(func);
}
function f1() { }
function f2(x) { }
function f3() {
let x;
}
function f4() {
function foo() {
}
}
function f5() {
let x = 1;
}
function f6() {
const x = 1;
}
function f7(x) {
return x;
}
function f8() {
let x;
return x;
}
function f9() {
function x() {
}
return x;
}
function f10(x) {
x = 1;
}
function f11() {
let x;
x = 1;
}
function f12() {
function x() {};
x = 1;
}
function f13(x) {
(function() { x; });
}
function f14() {
let x;
(function() { x; });
}
function f15() {
function x() {
}
(function() { x; });
}
function f16() {
let x = 1;
(function() { x; });
}
function f17() {
const x = 1;
(function() { x; });
}
function f18(x) {
return x;
(function() { x; });
}
function f19() {
let x;
return x;
(function() { x; });
}
function f20() {
function x() {
}
return x;
(function() { x; });
}
function f21(x) {
x = 1;
(function() { x; });
}
function f22() {
let x;
x = 1;
(function() { x; });
}
function f23() {
function x() { }
x = 1;
(function() { x; });
}
function f24() {
let x = 1;
{
let x = 2;
{
let x = 3;
assertEquals(3, x);
}
assertEquals(2, x);
}
assertEquals(1, x);
}
function f25() {
{
let x = 2;
L: {
let x = 3;
assertEquals(3, x);
break L;
assertTrue(false);
}
assertEquals(2, x);
}
assertTrue(true);
}
function f26() {
{
let x = 1;
L: {
let x = 2;
{
let x = 3;
assertEquals(3, x);
break L;
assertTrue(false);
}
assertTrue(false);
}
assertEquals(1, x);
}
}
function f27() {
do {
let x = 4;
assertEquals(4,x);
{
let x = 5;
assertEquals(5, x);
continue;
assertTrue(false);
}
} while (false);
}
function f28() {
label: for (var i = 0; i < 10; ++i) {
let x = 'middle' + i;
for (var j = 0; j < 10; ++j) {
let x = 'inner' + j;
continue label;
}
}
}
function f29() {
// Verify that the context is correctly set in the stack frame after exiting
// from with.
let x = 'outer';
label: {
let x = 'inner';
break label;
}
f(); // The context could be restored from the stack after the call.
assertEquals('outer', x);
function f() {
assertEquals('outer', x);
};
}
function f30() {
let x = 'outer';
for (var i = 0; i < 10; ++i) {
let x = 'inner';
continue;
}
f();
assertEquals('outer', x);
function f() {
assertEquals('outer', x);
};
}
function f31() {
{
let x = 'outer';
label: for (var i = 0; assertEquals('outer', x), i < 10; ++i) {
let x = 'middle' + i;
{
let x = 'inner' + j;
continue label;
}
}
assertEquals('outer', x);
}
}
var c = true;
function f32() {
{
let x = 'outer';
L: {
{
let x = 'inner';
if (c) {
break L;
}
}
foo();
}
}
function foo() {
return 'bar';
}
}
function f33() {
{
let x = 'outer';
L: {
{
let x = 'inner';
if (c) {
break L;
}
foo();
}
}
}
function foo() {
return 'bar';
}
}
function TestThrow() {
function f() {
let x = 'outer';
{
let x = 'inner';
throw x;
}
}
for (var i = 0; i < 5; i++) {
try {
f();
} catch (e) {
assertEquals('inner', e);
}
}
%OptimizeFunctionOnNextCall(f);
try {
f();
} catch (e) {
assertEquals('inner', e);
}
assertOptimized(f);
}
TestThrow();
// Test that temporal dead zone semantics for function and block scoped
// let bindings are handled by the optimizing compiler.
function TestFunctionLocal(s) {
'use strict';
var func = eval("(function baz(){" + s + "; })");
print("Testing:");
print(func);
for (var i = 0; i < 5; ++i) {
try {
func();
assertUnreachable();
} catch (e) {
assertInstanceof(e, ReferenceError);
}
}
%OptimizeFunctionOnNextCall(func);
try {
func();
assertUnreachable();
} catch (e) {
assertInstanceof(e, ReferenceError);
}
}
function TestFunctionContext(s) {
'use strict';
var func = eval("(function baz(){ " + s + "; (function() { x; }); })");
print("Testing:");
print(func);
for (var i = 0; i < 5; ++i) {
print(i);
try {
func();
assertUnreachable();
} catch (e) {
assertInstanceof(e, ReferenceError);
}
}
print("optimize");
%OptimizeFunctionOnNextCall(func);
try {
print("call");
func();
assertUnreachable();
} catch (e) {
print("catch");
assertInstanceof(e, ReferenceError);
}
}
function TestBlockLocal(s) {
'use strict';
var func = eval("(function baz(){ { " + s + "; } })");
print("Testing:");
print(func);
for (var i = 0; i < 5; ++i) {
try {
func();
assertUnreachable();
} catch (e) {
assertInstanceof(e, ReferenceError);
}
}
%OptimizeFunctionOnNextCall(func);
try {
func();
assertUnreachable();
} catch (e) {
assertInstanceof(e, ReferenceError);
}
}
function TestBlockContext(s) {
'use strict';
var func = eval("(function baz(){ { " + s + "; (function() { x; }); } })");
print("Testing:");
print(func);
for (var i = 0; i < 5; ++i) {
print(i);
try {
func();
assertUnreachable();
} catch (e) {
assertInstanceof(e, ReferenceError);
}
}
print("optimize");
%OptimizeFunctionOnNextCall(func);
try {
print("call");
func();
assertUnreachable();
} catch (e) {
print("catch");
assertInstanceof(e, ReferenceError);
}
}
function TestAll(s) {
TestFunctionLocal(s);
TestFunctionContext(s);
TestBlockLocal(s);
TestBlockContext(s);
}
// Use before initialization in declaration statement.
TestAll('let x = x + 1');
TestAll('let x = x += 1');
TestAll('let x = x++');
TestAll('let x = ++x');
TestAll('const x = x + 1');
// Use before initialization in prior statement.
TestAll('x + 1; let x;');
TestAll('x = 1; let x;');
TestAll('x += 1; let x;');
TestAll('++x; let x;');
TestAll('x++; let x;');
TestAll('let y = x; const x = 1;');
function f(x) {
let y = x + 42;
return y;
}
function g(x) {
{
let y = x + 42;
return y;
}
}
for (var i=0; i<10; i++) {
f(i);
g(i);
}
%OptimizeFunctionOnNextCall(f);
%OptimizeFunctionOnNextCall(g);
f(12);
g(12);
assertTrue(%GetOptimizationStatus(f) != 2);
assertTrue(%GetOptimizationStatus(g) != 2);

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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Test let declarations in various settings.
// Flags: --no-legacy-const --harmony-sloppy
// Global
let x;
let y = 2;
const z = 4;
// Block local
{
let y;
let x = 3;
const z = 5;
}
assertEquals(undefined, x);
assertEquals(2,y);
assertEquals(4,z);
if (true) {
let y;
assertEquals(undefined, y);
}
// Invalid declarations are early errors in harmony mode and thus should trigger
// an exception in eval code during parsing, before even compiling or executing
// the code. Thus the generated function is not called here.
function TestLocalThrows(str, expect) {
assertThrows("(function(arg){ 'use strict'; " + str + "})", expect);
}
function TestLocalDoesNotThrow(str) {
assertDoesNotThrow("(function(arg){ 'use strict'; " + str + "})()");
}
// Test let declarations in statement positions.
TestLocalThrows("if (true) let x;", SyntaxError);
TestLocalThrows("if (true) {} else let x;", SyntaxError);
TestLocalThrows("do let x; while (false)", SyntaxError);
TestLocalThrows("while (false) let x;", SyntaxError);
TestLocalThrows("label: let x;", SyntaxError);
TestLocalThrows("for (;false;) let x;", SyntaxError);
TestLocalDoesNotThrow("switch (true) { case true: let x; }");
TestLocalDoesNotThrow("switch (true) { default: let x; }");
// Test const declarations with initialisers in statement positions.
TestLocalThrows("if (true) const x = 1;", SyntaxError);
TestLocalThrows("if (true) {} else const x = 1;", SyntaxError);
TestLocalThrows("do const x = 1; while (false)", SyntaxError);
TestLocalThrows("while (false) const x = 1;", SyntaxError);
TestLocalThrows("label: const x = 1;", SyntaxError);
TestLocalThrows("for (;false;) const x = 1;", SyntaxError);
TestLocalDoesNotThrow("switch (true) { case true: const x = 1; }");
TestLocalDoesNotThrow("switch (true) { default: const x = 1; }");
// Test const declarations without initialisers.
TestLocalThrows("const x;", SyntaxError);
TestLocalThrows("const x = 1, y;", SyntaxError);
TestLocalThrows("const x, y = 1;", SyntaxError);
// Test const declarations without initialisers in statement positions.
TestLocalThrows("if (true) const x;", SyntaxError);
TestLocalThrows("if (true) {} else const x;", SyntaxError);
TestLocalThrows("do const x; while (false)", SyntaxError);
TestLocalThrows("while (false) const x;", SyntaxError);
TestLocalThrows("label: const x;", SyntaxError);
TestLocalThrows("for (;false;) const x;", SyntaxError);
TestLocalThrows("switch (true) { case true: const x; }", SyntaxError);
TestLocalThrows("switch (true) { default: const x; }", SyntaxError);
// Test var declarations in statement positions.
TestLocalDoesNotThrow("if (true) var x;");
TestLocalDoesNotThrow("if (true) {} else var x;");
TestLocalDoesNotThrow("do var x; while (false)");
TestLocalDoesNotThrow("while (false) var x;");
TestLocalDoesNotThrow("label: var x;");
TestLocalDoesNotThrow("for (;false;) var x;");
TestLocalDoesNotThrow("switch (true) { case true: var x; }");
TestLocalDoesNotThrow("switch (true) { default: var x; }");
// Test that redeclarations of functions are only allowed in outermost scope.
TestLocalThrows("{ let f; var f; }");
TestLocalThrows("{ var f; let f; }");
TestLocalThrows("{ function f() {} let f; }");
TestLocalThrows("{ let f; function f() {} }");
TestLocalThrows("{ function f() {} var f; }");
TestLocalThrows("{ var f; function f() {} }");
TestLocalThrows("{ function f() {} function f() {} }");
TestLocalThrows("function f() {} let f;");
TestLocalThrows("let f; function f() {}");
TestLocalDoesNotThrow("function arg() {}");
TestLocalDoesNotThrow("function f() {} var f;");
TestLocalDoesNotThrow("var f; function f() {}");
TestLocalDoesNotThrow("function f() {} function f() {}");
function g(f) {
function f() { return 1 }
return f()
}
assertEquals(1, g(function() { return 2 }))
// Test function declarations in source element and
// sloppy statement positions.
function f() {
// Sloppy source element positions.
function g0() {
"use strict";
// Strict source element positions.
function h() { }
{
function h1() { }
}
}
{
function g1() { }
}
}
f();
// Test function declarations in statement position in strict mode.
TestLocalThrows("function f() { if (true) function g() {} }", SyntaxError);
TestLocalThrows("function f() { if (true) {} else function g() {} }", SyntaxError);
TestLocalThrows("function f() { do function g() {} while (false) }", SyntaxError);
TestLocalThrows("function f() { while (false) function g() {} }", SyntaxError);
TestLocalThrows("function f() { label: function g() {} }", SyntaxError);
TestLocalThrows("function f() { for (;false;) function g() {} }", SyntaxError);
TestLocalDoesNotThrow("function f() { switch (true) { case true: function g() {} } }");
TestLocalDoesNotThrow("function f() { switch (true) { default: function g() {} } }");

188
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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Flags: --harmony-sloppy --no-legacy-const
// Test temporal dead zone semantics of let bound variables in
// function and block scopes.
function TestFunctionLocal(s) {
try {
eval("(function(){" + s + "; })")();
} catch (e) {
assertInstanceof(e, ReferenceError);
return;
}
assertUnreachable();
}
function TestBlockLocal(s,e) {
try {
eval("(function(){ {" + s + ";} })")();
} catch (e) {
assertInstanceof(e, ReferenceError);
return;
}
assertUnreachable();
}
function TestAll(s) {
TestBlockLocal(s);
TestFunctionLocal(s);
}
// Use before initialization in declaration statement.
TestAll('let x = x + 1');
TestAll('let x = x += 1');
TestAll('let x = x++');
TestAll('let x = ++x');
TestAll('const x = x + 1');
// Use before initialization in prior statement.
TestAll('x + 1; let x;');
TestAll('x = 1; let x;');
TestAll('x += 1; let x;');
TestAll('++x; let x;');
TestAll('x++; let x;');
TestAll('let y = x; const x = 1;');
TestAll('f(); let x; function f() { return x + 1; }');
TestAll('f(); let x; function f() { x = 1; }');
TestAll('f(); let x; function f() { x += 1; }');
TestAll('f(); let x; function f() { ++x; }');
TestAll('f(); let x; function f() { x++; }');
TestAll('f(); const x = 1; function f() { return x; }');
TestAll('f()(); let x; function f() { return function() { return x + 1; } }');
TestAll('f()(); let x; function f() { return function() { x = 1; } }');
TestAll('f()(); let x; function f() { return function() { x += 1; } }');
TestAll('f()(); let x; function f() { return function() { ++x; } }');
TestAll('f()(); let x; function f() { return function() { x++; } }');
TestAll('f()(); const x = 1; function f() { return function() { return x; } }');
// Use before initialization with a dynamic lookup.
TestAll('eval("x + 1;"); let x;');
TestAll('eval("x = 1;"); let x;');
TestAll('eval("x += 1;"); let x;');
TestAll('eval("++x;"); let x;');
TestAll('eval("x++;"); let x;');
TestAll('eval("x"); const x = 1;');
// Use before initialization with check for eval-shadowed bindings.
TestAll('function f() { eval("var y = 2;"); x + 1; }; f(); let x;');
// TODO(arv): https://code.google.com/p/v8/issues/detail?id=4284
// TestAll('function f() { eval("var y = 2;"); x = 1; }; f(); let x;');
TestAll('function f() { eval("var y = 2;"); x += 1; }; f(); let x;');
TestAll('function f() { eval("var y = 2;"); ++x; }; f(); let x;');
TestAll('function f() { eval("var y = 2;"); x++; }; f(); let x;');
// Test that variables introduced by function declarations are created and
// initialized upon entering a function / block scope.
function f() {
{
assertEquals(2, g1());
assertEquals(2, eval("g1()"));
// block scoped function declaration
function g1() {
return 2;
}
}
assertEquals(3, g2());
assertEquals(3, eval("g2()"));
// function scoped function declaration
function g2() {
return 3;
}
}
f();
// Test that a function declaration introduces a block scoped variable.
TestAll('{ function k() { return 0; } }; k(); ');
// Test that a function declaration sees the scope it resides in.
function f2() {
let m, n, o, p;
{
m = g;
function g() {
return a;
}
let a = 1;
}
assertEquals(1, m());
try {
throw 2;
} catch(b) {
n = h;
function h() {
return b + c;
}
let c = 3;
}
assertEquals(5, n());
{
o = i;
function i() {
return d;
}
let d = 4;
}
assertEquals(4, o());
try {
throw 5;
} catch(e) {
p = j;
function j() {
return e + f;
}
let f = 6;
}
assertEquals(11, p());
}
f2();
// Test that resolution of let bound variables works with scopes that call eval.
function outer() {
function middle() {
function inner() {
return x;
}
eval("1 + 1");
return x + inner();
}
let x = 1;
return middle();
}
assertEquals(2, outer());

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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Flags: --allow-natives-syntax --harmony-sloppy --no-legacy-const
// Test functionality of block scopes.
// Hoisting of var declarations.
function f1() {
{
var x = 1;
var y;
}
assertEquals(1, x)
assertEquals(undefined, y)
}
for (var j = 0; j < 5; ++j) f1();
%OptimizeFunctionOnNextCall(f1);
f1();
assertTrue(%GetOptimizationStatus(f1) != 2);
// Dynamic lookup in and through block contexts.
function f2(one) {
var x = one + 1;
let y = one + 2;
const u = one + 4;
{
let z = one + 3;
const v = one + 5;
assertEquals(1, eval('one'));
assertEquals(2, eval('x'));
assertEquals(3, eval('y'));
assertEquals(4, eval('z'));
assertEquals(5, eval('u'));
assertEquals(6, eval('v'));
}
}
f2(1);
// Lookup in and through block contexts.
function f3(one) {
var x = one + 1;
let y = one + 2;
const u = one + 4;
{
let z = one + 3;
const v = one + 5;
assertEquals(1, one);
assertEquals(2, x);
assertEquals(3, y);
assertEquals(4, z);
assertEquals(5, u);
assertEquals(6, v);
}
}
for (var j = 0; j < 5; ++j) f3(1);
%OptimizeFunctionOnNextCall(f3);
f3(1);
assertTrue(%GetOptimizationStatus(f3) != 2);
// Dynamic lookup from closure.
function f4(one) {
var x = one + 1;
let y = one + 2;
const u = one + 4;
{
let z = one + 3;
const v = one + 5;
function f() {
assertEquals(1, eval('one'));
assertEquals(2, eval('x'));
assertEquals(3, eval('y'));
assertEquals(4, eval('z'));
assertEquals(5, eval('u'));
assertEquals(6, eval('v'));
}
f();
}
}
f4(1);
// Lookup from closure.
function f5(one) {
var x = one + 1;
let y = one + 2;
const u = one + 4;
{
let z = one + 3;
const v = one + 5;
function f() {
assertEquals(1, one);
assertEquals(2, x);
assertEquals(3, y);
assertEquals(4, z);
assertEquals(5, u);
assertEquals(6, v);
}
f();
}
}
f5(1);
// Return from block.
function f6() {
let x = 1;
const u = 3;
{
let y = 2;
const v = 4;
return x + y;
}
}
assertEquals(3, f6(6));
// Variable shadowing and lookup.
function f7(a) {
let b = 1;
var c = 1;
var d = 1;
const e = 1;
{ // let variables shadowing argument, let, const and var variables
let a = 2;
let b = 2;
let c = 2;
let e = 2;
assertEquals(2,a);
assertEquals(2,b);
assertEquals(2,c);
assertEquals(2,e);
}
{ // const variables shadowing argument, let, const and var variables
const a = 2;
const b = 2;
const c = 2;
const e = 2;
assertEquals(2,a);
assertEquals(2,b);
assertEquals(2,c);
assertEquals(2,e);
}
try {
throw 'stuff1';
} catch (a) {
assertEquals('stuff1',a);
// catch variable shadowing argument
a = 2;
assertEquals(2,a);
{
// let variable shadowing catch variable
let a = 3;
assertEquals(3,a);
try {
throw 'stuff2';
} catch (a) {
assertEquals('stuff2',a);
// catch variable shadowing let variable
a = 4;
assertEquals(4,a);
}
assertEquals(3,a);
}
assertEquals(2,a);
}
try {
throw 'stuff3';
} catch (c) {
// catch variable shadowing var variable
assertEquals('stuff3',c);
{
// const variable shadowing catch variable
const c = 3;
assertEquals(3,c);
}
assertEquals('stuff3',c);
try {
throw 'stuff4';
} catch(c) {
assertEquals('stuff4',c);
// catch variable shadowing catch variable
c = 3;
assertEquals(3,c);
}
(function(c) {
// argument shadowing catch variable
c = 3;
assertEquals(3,c);
})();
assertEquals('stuff3', c);
(function() {
// var variable shadowing catch variable
var c = 3;
})();
assertEquals('stuff3', c);
c = 2;
}
assertEquals(1,c);
(function(a,b,c,e) {
// arguments shadowing argument, let, const and var variable
a = 2;
b = 2;
c = 2;
e = 2;
assertEquals(2,a);
assertEquals(2,b);
assertEquals(2,c);
assertEquals(2,e);
// var variable shadowing var variable
var d = 2;
})(1,1);
assertEquals(1,a);
assertEquals(1,b);
assertEquals(1,c);
assertEquals(1,d);
assertEquals(1,e);
}
f7(1);
// Ensure let and const variables are block local
// and var variables function local.
function f8() {
var let_accessors = [];
var var_accessors = [];
var const_accessors = [];
for (var i = 0; i < 10; i++) {
let x = i;
var y = i;
const z = i;
let_accessors[i] = function() { return x; }
var_accessors[i] = function() { return y; }
const_accessors[i] = function() { return z; }
}
for (var j = 0; j < 10; j++) {
y = j + 10;
assertEquals(j, let_accessors[j]());
assertEquals(y, var_accessors[j]());
assertEquals(j, const_accessors[j]());
}
}
f8();

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// Copyright 2015 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.
// Flags: --min-preparse-length=0
// Flags: --no-legacy-const --harmony-sloppy
let xxx = 1;
let f = undefined;
{
let inner_x = xxx;
f = function() { return inner_x; };
}
assertSame(1, f());
xxx = 42;
{
f = function() { return inner_x1; };
let inner_x1 = xxx;
}
assertSame(42, f());
xxx = 31;
{
let inner_x1 = xxx;
try {
throw new Error();
} catch (e) {
f = function() { return inner_x1; };
}
}
assertSame(31, f());