int receiver_offset = 2 + info_->scope()->num_parameters();
__ ldr(r1, MemOperand(fp, receiver_offset * kPointerSize));
__ push(r1);
- // Push the strict mode flag.
- __ mov(r1, Operand(Smi::FromInt(strict_mode_flag())));
+ // Push the strict mode flag. In harmony mode every eval call
+ // is a strict mode eval call.
+ StrictModeFlag strict_mode = strict_mode_flag();
+ if (FLAG_harmony_block_scoping) {
+ strict_mode = kStrictMode;
+ }
+ __ mov(r1, Operand(Smi::FromInt(strict_mode)));
__ push(r1);
__ CallRuntime(flag == SKIP_CONTEXT_LOOKUP
class Declaration: public AstNode {
public:
- Declaration(VariableProxy* proxy, Variable::Mode mode, FunctionLiteral* fun)
+ Declaration(VariableProxy* proxy,
+ Variable::Mode mode,
+ FunctionLiteral* fun,
+ Scope* scope)
: proxy_(proxy),
mode_(mode),
- fun_(fun) {
+ fun_(fun),
+ scope_(scope) {
ASSERT(mode == Variable::VAR ||
mode == Variable::CONST ||
mode == Variable::LET);
Variable::Mode mode() const { return mode_; }
FunctionLiteral* fun() const { return fun_; } // may be NULL
virtual bool IsInlineable() const;
+ Scope* scope() const { return scope_; }
private:
VariableProxy* proxy_;
Variable::Mode mode_;
FunctionLiteral* fun_;
+
+ // Nested scope from which the declaration originated.
+ Scope* scope_;
};
// Push the receiver of the enclosing function.
__ push(Operand(ebp, (2 + info_->scope()->num_parameters()) * kPointerSize));
- // Push the strict mode flag.
- __ push(Immediate(Smi::FromInt(strict_mode_flag())));
+ // Push the strict mode flag. In harmony mode every eval call
+ // is a strict mode eval call.
+ StrictModeFlag strict_mode = strict_mode_flag();
+ if (FLAG_harmony_block_scoping) {
+ strict_mode = kStrictMode;
+ }
+ __ push(Immediate(Smi::FromInt(strict_mode)));
__ CallRuntime(flag == SKIP_CONTEXT_LOOKUP
? Runtime::kResolvePossiblyDirectEvalNoLookup
int receiver_offset = 2 + info_->scope()->num_parameters();
__ lw(a1, MemOperand(fp, receiver_offset * kPointerSize));
__ push(a1);
- // Push the strict mode flag.
- __ li(a1, Operand(Smi::FromInt(strict_mode_flag())));
+ // Push the strict mode flag. In harmony mode every eval call
+ // is a strict mode eval call.
+ StrictModeFlag strict_mode = strict_mode_flag();
+ if (FLAG_harmony_block_scoping) {
+ strict_mode = kStrictMode;
+ }
+ __ li(a1, Operand(Smi::FromInt(strict_mode)));
__ push(a1);
__ CallRuntime(flag == SKIP_CONTEXT_LOOKUP
if (ok && top_scope_->is_strict_mode()) {
CheckOctalLiteral(beg_loc, scanner().location().end_pos, &ok);
}
+
+ if (ok && harmony_block_scoping_) {
+ CheckConflictingVarDeclarations(scope, &ok);
+ }
+
if (ok) {
result = new(zone()) FunctionLiteral(
isolate(),
// Declare the name.
var = declaration_scope->DeclareLocal(name, mode);
} else {
- // The name was declared before; check for conflicting re-declarations.
- // We have a conflict if either of the declarations is not a var. There
- // is similar code in runtime.cc in the Declare functions.
+ // The name was declared in this scope before; check for conflicting
+ // re-declarations. We have a conflict if either of the declarations is
+ // not a var. There is similar code in runtime.cc in the Declare
+ // functions. The function CheckNonConflictingScope checks for conflicting
+ // var and let bindings from different scopes whereas this is a check for
+ // conflicting declarations within the same scope. This check also covers
+ //
+ // function () { let x; { var x; } }
+ //
+ // because the var declaration is hoisted to the function scope where 'x'
+ // is already bound.
if ((mode != Variable::VAR) || (var->mode() != Variable::VAR)) {
// We only have vars, consts and lets in declarations.
ASSERT(var->mode() == Variable::VAR ||
var->mode() == Variable::CONST ||
var->mode() == Variable::LET);
+ if (harmony_block_scoping_) {
+ // In harmony mode we treat re-declarations as early errors. See
+ // ES5 16 for a definition of early errors.
+ SmartPointer<char> c_string = name->ToCString(DISALLOW_NULLS);
+ const char* elms[2] = { "Variable", *c_string };
+ Vector<const char*> args(elms, 2);
+ ReportMessage("redeclaration", args);
+ *ok = false;
+ return NULL;
+ }
const char* type = (var->mode() == Variable::VAR) ? "var" :
(var->mode() == Variable::CONST) ? "const" : "let";
Handle<String> type_string =
// semantic issue as long as we keep the source order, but it may be
// a performance issue since it may lead to repeated
// Runtime::DeclareContextSlot() calls.
- VariableProxy* proxy = declaration_scope->NewUnresolved(name, false);
- declaration_scope->AddDeclaration(new(zone()) Declaration(proxy, mode, fun));
+ VariableProxy* proxy = declaration_scope->NewUnresolved(
+ name, false, scanner().location().beg_pos);
+ declaration_scope->AddDeclaration(
+ new(zone()) Declaration(proxy, mode, fun, top_scope_));
// For global const variables we bind the proxy to a variable.
if (mode == Variable::CONST && declaration_scope->is_global_scope()) {
if (top_scope_->is_strict_mode()) {
catch_scope->EnableStrictMode();
}
- catch_variable = catch_scope->DeclareLocal(name, Variable::VAR);
+ Variable::Mode mode = harmony_block_scoping_
+ ? Variable::LET : Variable::VAR;
+ catch_variable = catch_scope->DeclareLocal(name, mode);
catch_block = new(zone()) Block(isolate(), NULL, 2, false);
Scope* saved_scope = top_scope_;
reserved_loc = scanner().location();
}
- top_scope_->DeclareParameter(param_name);
+ top_scope_->DeclareParameter(param_name,
+ harmony_block_scoping_
+ ? Variable::LET
+ : Variable::VAR);
num_parameters++;
if (num_parameters > kMaxNumFunctionParameters) {
ReportMessageAt(scanner().location(), "too_many_parameters",
}
}
+ if (harmony_block_scoping_) {
+ CheckConflictingVarDeclarations(scope, CHECK_OK);
+ }
+
FunctionLiteral* function_literal =
new(zone()) FunctionLiteral(isolate(),
function_name,
}
+void Parser::CheckConflictingVarDeclarations(Scope* scope, bool* ok) {
+ Declaration* decl = scope->CheckConflictingVarDeclarations();
+ if (decl != NULL) {
+ // In harmony mode we treat conflicting variable bindinds as early
+ // errors. See ES5 16 for a definition of early errors.
+ Handle<String> name = decl->proxy()->name();
+ SmartPointer<char> c_string = name->ToCString(DISALLOW_NULLS);
+ const char* elms[2] = { "Variable", *c_string };
+ Vector<const char*> args(elms, 2);
+ int position = decl->proxy()->position();
+ Scanner::Location location = position == RelocInfo::kNoPosition
+ ? Scanner::Location::invalid()
+ : Scanner::Location(position, position + 1);
+ ReportMessageAt(location, "redeclaration", args);
+ *ok = false;
+ }
+}
+
+
// This function reads an identifier name and determines whether or not it
// is 'get' or 'set'.
Handle<String> Parser::ParseIdentifierNameOrGetOrSet(bool* is_get,
// Strict mode octal literal validation.
void CheckOctalLiteral(int beg_pos, int end_pos, bool* ok);
+ // For harmony block scoping mode: Check if the scope has conflicting var/let
+ // declarations from different scopes. It covers for example
+ //
+ // function f() { { { var x; } let x; } }
+ // function g() { { var x; let x; } }
+ //
+ // The var declarations are hoisted to the function scope, but originate from
+ // a scope where the name has also been let bound or the var declaration is
+ // hoisted over such a scope.
+ void CheckConflictingVarDeclarations(Scope* scope, bool* ok);
+
// Parser support
VariableProxy* Declare(Handle<String> name, Variable::Mode mode,
FunctionLiteral* fun,
}
-void Scope::DeclareParameter(Handle<String> name) {
+void Scope::DeclareParameter(Handle<String> name, Variable::Mode mode) {
ASSERT(!already_resolved());
ASSERT(is_function_scope());
Variable* var =
- variables_.Declare(this, name, Variable::VAR, true, Variable::NORMAL);
+ variables_.Declare(this, name, mode, true, Variable::NORMAL);
params_.Add(var);
}
}
+Declaration* Scope::CheckConflictingVarDeclarations() {
+ int length = decls_.length();
+ for (int i = 0; i < length; i++) {
+ Declaration* decl = decls_[i];
+ if (decl->mode() != Variable::VAR) continue;
+ Handle<String> name = decl->proxy()->name();
+ bool cond = true;
+ for (Scope* scope = decl->scope(); cond ; scope = scope->outer_scope_) {
+ // There is a conflict if there exists a non-VAR binding.
+ Variable* other_var = scope->variables_.Lookup(name);
+ if (other_var != NULL && other_var->mode() != Variable::VAR) {
+ return decl;
+ }
+
+ // Include declaration scope in the iteration but stop after.
+ if (!scope->is_block_scope() && !scope->is_catch_scope()) cond = false;
+ }
+ }
+ return NULL;
+}
+
+
template<class Allocator>
void Scope::CollectUsedVariables(List<Variable*, Allocator>* locals) {
// Collect variables in this scope.
// Declare a parameter in this scope. When there are duplicated
// parameters the rightmost one 'wins'. However, the implementation
// expects all parameters to be declared and from left to right.
- void DeclareParameter(Handle<String> name);
+ void DeclareParameter(Handle<String> name, Variable::Mode mode);
// Declare a local variable in this scope. If the variable has been
// declared before, the previously declared variable is returned.
// Check if the scope has (at least) one illegal redeclaration.
bool HasIllegalRedeclaration() const { return illegal_redecl_ != NULL; }
+ // For harmony block scoping mode: Check if the scope has conflicting var
+ // declarations, i.e. a var declaration that has been hoisted from a nested
+ // scope over a let binding of the same name.
+ Declaration* CheckConflictingVarDeclarations();
// ---------------------------------------------------------------------------
// Scope-specific info.
// Push the receiver of the enclosing function and do runtime call.
__ push(Operand(rbp, (2 + info_->scope()->num_parameters()) * kPointerSize));
- // Push the strict mode flag.
- __ Push(Smi::FromInt(strict_mode_flag()));
+ // Push the strict mode flag. In harmony mode every eval call
+ // is a strict mode eval call.
+ StrictModeFlag strict_mode = strict_mode_flag();
+ if (FLAG_harmony_block_scoping) {
+ strict_mode = kStrictMode;
+ }
+ __ Push(Smi::FromInt(strict_mode));
__ CallRuntime(flag == SKIP_CONTEXT_LOOKUP
? Runtime::kResolvePossiblyDirectEvalNoLookup
--- /dev/null
+// 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-block-scoping
+
+// Test for conflicting variable bindings.
+
+function CheckException(e) {
+ var string = e.toString();
+ assertTrue(string.indexOf("has already been declared") >= 0 ||
+ string.indexOf("redeclaration") >= 0); return 'Conflict';
+}
+
+
+function TestFunction(s,e) {
+ try {
+ return eval("(function(){" + s + ";return " + e + "})")();
+ } catch (x) {
+ return CheckException(x);
+ }
+}
+
+
+function TestBlock(s,e) {
+ try {
+ return eval("(function(){ if (true) { " + s + "; }; return " + e + "})")();
+ } catch (x) {
+ return CheckException(x);
+ }
+}
+
+function TestAll(expected,s,opt_e) {
+ var e = "";
+ var msg = s;
+ if (opt_e) { e = opt_e; msg += "; " + opt_e; }
+ assertEquals(expected, TestFunction(s,e), "function:'" + msg + "'");
+ assertEquals(expected, TestBlock(s,e), "block:'" + msg + "'");
+}
+
+
+function TestConflict(s) {
+ TestAll('Conflict', s);
+ TestAll('Conflict', 'eval("' + s + '")');
+}
+
+
+function TestNoConflict(s) {
+ TestAll('NoConflict', s, "'NoConflict'");
+ TestAll('NoConflict', 'eval("' + s + '")', "'NoConflict'");
+}
+
+var letbinds = [ "let x",
+ "let x = 0",
+ "let x = undefined",
+ "function x() { }",
+ "let x = function() {}",
+ "let x, y",
+ "let y, x",
+ ];
+var varbinds = [ "var x",
+ "var x = 0",
+ "var x = undefined",
+ "var x = function() {}",
+ "var x, y",
+ "var y, x",
+ ];
+
+
+for (var l = 0; l < letbinds.length; ++l) {
+ // Test conflicting let/var bindings.
+ for (var v = 0; v < varbinds.length; ++v) {
+ // Same level.
+ TestConflict(letbinds[l] +'; ' + varbinds[v]);
+ TestConflict(varbinds[v] +'; ' + letbinds[l]);
+ // Different level.
+ TestConflict(letbinds[l] +'; {' + varbinds[v] + '; }');
+ TestConflict('{ ' + varbinds[v] +'; }' + letbinds[l]);
+ }
+
+ // Test conflicting let/let bindings.
+ for (var k = 0; k < letbinds.length; ++k) {
+ // Same level.
+ TestConflict(letbinds[l] +'; ' + letbinds[k]);
+ TestConflict(letbinds[k] +'; ' + letbinds[l]);
+ // Different level.
+ TestNoConflict(letbinds[l] +'; { ' + letbinds[k] + '; }');
+ TestNoConflict('{ ' + letbinds[k] +'; } ' + letbinds[l]);
+ }
+
+ // Test conflicting parameter/let bindings.
+ TestConflict('(function (x) { ' + letbinds[l] + '; })()');
+}
+
+// Test conflicting catch/var bindings.
+for (var v = 0; v < varbinds.length; ++v) {
+ TestConflict('try {} catch (x) { ' + varbinds[v] + '; }');
+}
+
+// Test conflicting parameter/var bindings.
+for (var v = 0; v < varbinds.length; ++v) {
+ TestConflict('(function (x) { ' + varbinds[v] + '; })()');
+}
// Unprotected statement
TestLocalThrows("if (true) let x;", SyntaxError);
-TestLocalThrows("with ({}) let x;", SyntaxError);
TestLocalThrows("do let x; while (false)", SyntaxError);
TestLocalThrows("while (false) let x;", SyntaxError);
TestLocalDoesNotThrow("if (true) var x;");
-TestLocalDoesNotThrow("with ({}) var x;");
TestLocalDoesNotThrow("do var x; while (false)");
TestLocalDoesNotThrow("while (false) var x;");
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