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Implement fast load and call of arguments in the presence of eval.

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Load the arguments object from the context if there are no extensions
objects on the way. Then load the argument with a keyed load ic.

Review URL: http://codereview.chromium.org/2033004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4633 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
ager@chromium.org 2010-05-10 12:20:06 +00:00
parent 9f859fef26
commit f54b7767c6
5 changed files with 268 additions and 52 deletions
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75
src/arm/codegen-arm.cc
View File

@ -2776,22 +2776,15 @@ void CodeGenerator::LoadFromSlot(Slot* slot, TypeofState typeof_state) {
// containing the eval.
if (slot->var()->mode() == Variable::DYNAMIC_GLOBAL) {
LoadFromGlobalSlotCheckExtensions(slot, typeof_state, &slow);
// If there was no control flow to slow, we can exit early.
if (!slow.is_linked()) {
frame_->EmitPush(r0);
return;
}
frame_->SpillAll();
done.Jump();
} else if (slot->var()->mode() == Variable::DYNAMIC_LOCAL) {
frame_->SpillAll();
Slot* potential_slot = slot->var()->local_if_not_shadowed()->slot();
// Only generate the fast case for locals that rewrite to slots.
// This rules out argument loads because eval forces arguments
// access to be through the arguments object.
Expression* rewrite = slot->var()->local_if_not_shadowed()->rewrite();
if (potential_slot != NULL) {
// Generate fast case for locals that rewrite to slots.
__ ldr(r0,
ContextSlotOperandCheckExtensions(potential_slot,
r1,
@ -2802,10 +2795,32 @@ void CodeGenerator::LoadFromSlot(Slot* slot, TypeofState typeof_state) {
__ cmp(r0, ip);
__ LoadRoot(r0, Heap::kUndefinedValueRootIndex, eq);
}
// There is always control flow to slow from
// ContextSlotOperandCheckExtensions so we have to jump around
// it.
done.Jump();
} else if (rewrite != NULL) {
// Generate fast case for argument loads.
Property* property = rewrite->AsProperty();
if (property != NULL) {
VariableProxy* obj_proxy = property->obj()->AsVariableProxy();
Literal* key_literal = property->key()->AsLiteral();
if (obj_proxy != NULL &&
key_literal != NULL &&
obj_proxy->IsArguments() &&
key_literal->handle()->IsSmi()) {
// Load arguments object if there are no eval-introduced
// variables. Then load the argument from the arguments
// object using keyed load.
__ ldr(r0,
ContextSlotOperandCheckExtensions(obj_proxy->var()->slot(),
r1,
r2,
&slow));
frame_->EmitPush(r0);
__ mov(r1, Operand(key_literal->handle()));
frame_->EmitPush(r1);
EmitKeyedLoad();
done.Jump();
}
}
}
}
@ -3708,12 +3723,12 @@ void CodeGenerator::VisitCall(Call* node) {
// ----------------------------------
// JavaScript examples:
//
// with (obj) foo(1, 2, 3) // foo is in obj
// with (obj) foo(1, 2, 3) // foo may be in obj.
//
// function f() {};
// function g() {
// eval(...);
// f(); // f could be in extension object
// f(); // f could be in extension object.
// }
// ----------------------------------
@ -3735,10 +3750,9 @@ void CodeGenerator::VisitCall(Call* node) {
} else if (var->mode() == Variable::DYNAMIC_LOCAL) {
Slot* potential_slot = var->local_if_not_shadowed()->slot();
// Only generate the fast case for locals that rewrite to slots.
// This rules out argument loads because eval forces arguments
// access to be through the arguments object.
Expression* rewrite = var->local_if_not_shadowed()->rewrite();
if (potential_slot != NULL) {
// Generate fast case for locals that rewrite to slots.
__ ldr(r0,
ContextSlotOperandCheckExtensions(potential_slot,
r1,
@ -3752,6 +3766,33 @@ void CodeGenerator::VisitCall(Call* node) {
frame_->EmitPush(r0);
LoadGlobalReceiver(r1);
done.Jump();
} else if (rewrite != NULL) {
// Generate fast case for calls of an argument function.
Property* property = rewrite->AsProperty();
if (property != NULL) {
VariableProxy* obj_proxy = property->obj()->AsVariableProxy();
Literal* key_literal = property->key()->AsLiteral();
if (obj_proxy != NULL &&
key_literal != NULL &&
obj_proxy->IsArguments() &&
key_literal->handle()->IsSmi()) {
// Load arguments object if there are no eval-introduced
// variables. Then load the argument from the arguments
// object using keyed load.
__ ldr(r0,
ContextSlotOperandCheckExtensions(obj_proxy->var()->slot(),
r1,
r2,
&slow));
frame_->EmitPush(r0);
__ mov(r1, Operand(key_literal->handle()));
frame_->EmitPush(r1);
EmitKeyedLoad();
frame_->EmitPush(r0);
LoadGlobalReceiver(r1);
done.Jump();
}
}
}
}

80
src/ia32/codegen-ia32.cc
View File

@ -4731,16 +4731,13 @@ Result CodeGenerator::LoadFromSlot(Slot* slot, TypeofState typeof_state) {
// containing the eval.
if (slot->var()->mode() == Variable::DYNAMIC_GLOBAL) {
result = LoadFromGlobalSlotCheckExtensions(slot, typeof_state, &slow);
// If there was no control flow to slow, we can exit early.
if (!slow.is_linked()) return result;
done.Jump(&result);
} else if (slot->var()->mode() == Variable::DYNAMIC_LOCAL) {
Slot* potential_slot = slot->var()->local_if_not_shadowed()->slot();
// Only generate the fast case for locals that rewrite to slots.
// This rules out argument loads because eval forces arguments
// access to be through the arguments object.
Expression* rewrite = slot->var()->local_if_not_shadowed()->rewrite();
if (potential_slot != NULL) {
// Generate fast case for locals that rewrite to slots.
// Allocate a fresh register to use as a temp in
// ContextSlotOperandCheckExtensions and to hold the result
// value.
@ -4755,10 +4752,32 @@ Result CodeGenerator::LoadFromSlot(Slot* slot, TypeofState typeof_state) {
done.Branch(not_equal, &result);
__ mov(result.reg(), Factory::undefined_value());
}
// There is always control flow to slow from
// ContextSlotOperandCheckExtensions so we have to jump around
// it.
done.Jump(&result);
} else if (rewrite != NULL) {
// Generate fast case for argument loads.
Property* property = rewrite->AsProperty();
if (property != NULL) {
VariableProxy* obj_proxy = property->obj()->AsVariableProxy();
Literal* key_literal = property->key()->AsLiteral();
if (obj_proxy != NULL &&
key_literal != NULL &&
obj_proxy->IsArguments() &&
key_literal->handle()->IsSmi()) {
// Load arguments object if there are no eval-introduced
// variables. Then load the argument from the arguments
// object using keyed load.
Result arguments = allocator()->Allocate();
ASSERT(arguments.is_valid());
__ mov(arguments.reg(),
ContextSlotOperandCheckExtensions(obj_proxy->var()->slot(),
arguments,
&slow));
frame_->Push(&arguments);
frame_->Push(key_literal->handle());
result = EmitKeyedLoad();
done.Jump(&result);
}
}
}
}
@ -5765,12 +5784,12 @@ void CodeGenerator::VisitCall(Call* node) {
// ----------------------------------
// JavaScript examples:
//
// with (obj) foo(1, 2, 3) // foo is in obj
// with (obj) foo(1, 2, 3) // foo may be in obj.
//
// function f() {};
// function g() {
// eval(...);
// f(); // f could be in extension object
// f(); // f could be in extension object.
// }
// ----------------------------------
@ -5782,25 +5801,23 @@ void CodeGenerator::VisitCall(Call* node) {
// introducing variables. In those cases, we do not want to
// perform a runtime call for all variables in the scope
// containing the eval.
Result function;
if (var->mode() == Variable::DYNAMIC_GLOBAL) {
function = LoadFromGlobalSlotCheckExtensions(var->slot(),
NOT_INSIDE_TYPEOF,
&slow);
Result function = LoadFromGlobalSlotCheckExtensions(var->slot(),
NOT_INSIDE_TYPEOF,
&slow);
frame_->Push(&function);
LoadGlobalReceiver();
done.Jump();
} else if (var->mode() == Variable::DYNAMIC_LOCAL) {
Slot* potential_slot = var->local_if_not_shadowed()->slot();
// Only generate the fast case for locals that rewrite to slots.
// This rules out argument loads because eval forces arguments
// access to be through the arguments object.
Expression* rewrite = var->local_if_not_shadowed()->rewrite();
if (potential_slot != NULL) {
// Generate fast case for locals that rewrite to slots.
// Allocate a fresh register to use as a temp in
// ContextSlotOperandCheckExtensions and to hold the result
// value.
function = allocator()->Allocate();
Result function = allocator()->Allocate();
ASSERT(function.is_valid());
__ mov(function.reg(),
ContextSlotOperandCheckExtensions(potential_slot,
@ -5816,6 +5833,33 @@ void CodeGenerator::VisitCall(Call* node) {
frame_->Push(&function);
LoadGlobalReceiver();
done.Jump();
} else if (rewrite != NULL) {
// Generate fast case for calls of an argument function.
Property* property = rewrite->AsProperty();
if (property != NULL) {
VariableProxy* obj_proxy = property->obj()->AsVariableProxy();
Literal* key_literal = property->key()->AsLiteral();
if (obj_proxy != NULL &&
key_literal != NULL &&
obj_proxy->IsArguments() &&
key_literal->handle()->IsSmi()) {
// Load arguments object if there are no eval-introduced
// variables. Then load the argument from the arguments
// object using keyed load.
Result arguments = allocator()->Allocate();
ASSERT(arguments.is_valid());
__ mov(arguments.reg(),
ContextSlotOperandCheckExtensions(obj_proxy->var()->slot(),
arguments,
&slow));
frame_->Push(&arguments);
frame_->Push(key_literal->handle());
Result value = EmitKeyedLoad();
frame_->Push(&value);
LoadGlobalReceiver();
done.Jump();
}
}
}
}

77
src/x64/codegen-x64.cc
View File

@ -2867,12 +2867,12 @@ void CodeGenerator::VisitCall(Call* node) {
// ----------------------------------
// JavaScript examples:
//
// with (obj) foo(1, 2, 3) // foo is in obj
// with (obj) foo(1, 2, 3) // foo may be in obj.
//
// function f() {};
// function g() {
// eval(...);
// f(); // f could be in extension object
// f(); // f could be in extension object.
// }
// ----------------------------------
@ -2895,10 +2895,9 @@ void CodeGenerator::VisitCall(Call* node) {
} else if (var->mode() == Variable::DYNAMIC_LOCAL) {
Slot* potential_slot = var->local_if_not_shadowed()->slot();
// Only generate the fast case for locals that rewrite to slots.
// This rules out argument loads because eval forces arguments
// access to be through the arguments object.
Expression* rewrite = var->local_if_not_shadowed()->rewrite();
if (potential_slot != NULL) {
// Generate fast case for locals that rewrite to slots.
// Allocate a fresh register to use as a temp in
// ContextSlotOperandCheckExtensions and to hold the result
// value.
@ -2918,6 +2917,34 @@ void CodeGenerator::VisitCall(Call* node) {
frame_->Push(&function);
LoadGlobalReceiver();
done.Jump();
} else if (rewrite != NULL) {
// Generate fast case for calls of an argument function.
Property* property = rewrite->AsProperty();
if (property != NULL) {
VariableProxy* obj_proxy = property->obj()->AsVariableProxy();
Literal* key_literal = property->key()->AsLiteral();
if (obj_proxy != NULL &&
key_literal != NULL &&
obj_proxy->IsArguments() &&
key_literal->handle()->IsSmi()) {
// Load arguments object if there are no eval-introduced
// variables. Then load the argument from the arguments
// object using keyed load.
Result arguments = allocator()->Allocate();
ASSERT(arguments.is_valid());
__ movq(arguments.reg(),
ContextSlotOperandCheckExtensions(obj_proxy->var()->slot(),
arguments,
&slow));
frame_->Push(&arguments);
frame_->Push(key_literal->handle());
Result value = EmitKeyedLoad(false);
frame_->Drop(2); // Drop key and receiver.
frame_->Push(&value);
LoadGlobalReceiver();
done.Jump();
}
}
}
}
@ -5342,20 +5369,13 @@ void CodeGenerator::LoadFromSlot(Slot* slot, TypeofState typeof_state) {
// containing the eval.
if (slot->var()->mode() == Variable::DYNAMIC_GLOBAL) {
value = LoadFromGlobalSlotCheckExtensions(slot, typeof_state, &slow);
// If there was no control flow to slow, we can exit early.
if (!slow.is_linked()) {
frame_->Push(&value);
return;
}
done.Jump(&value);
} else if (slot->var()->mode() == Variable::DYNAMIC_LOCAL) {
Slot* potential_slot = slot->var()->local_if_not_shadowed()->slot();
// Only generate the fast case for locals that rewrite to slots.
// This rules out argument loads because eval forces arguments
// access to be through the arguments object.
Expression* rewrite = slot->var()->local_if_not_shadowed()->rewrite();
if (potential_slot != NULL) {
// Generate fast case for locals that rewrite to slots.
// Allocate a fresh register to use as a temp in
// ContextSlotOperandCheckExtensions and to hold the result
// value.
@ -5370,10 +5390,33 @@ void CodeGenerator::LoadFromSlot(Slot* slot, TypeofState typeof_state) {
done.Branch(not_equal, &value);
__ LoadRoot(value.reg(), Heap::kUndefinedValueRootIndex);
}
// There is always control flow to slow from
// ContextSlotOperandCheckExtensions so we have to jump around
// it.
done.Jump(&value);
} else if (rewrite != NULL) {
// Generate fast case for argument loads.
Property* property = rewrite->AsProperty();
if (property != NULL) {
VariableProxy* obj_proxy = property->obj()->AsVariableProxy();
Literal* key_literal = property->key()->AsLiteral();
if (obj_proxy != NULL &&
key_literal != NULL &&
obj_proxy->IsArguments() &&
key_literal->handle()->IsSmi()) {
// Load arguments object if there are no eval-introduced
// variables. Then load the argument from the arguments
// object using keyed load.
Result arguments = allocator()->Allocate();
ASSERT(arguments.is_valid());
__ movq(arguments.reg(),
ContextSlotOperandCheckExtensions(obj_proxy->var()->slot(),
arguments,
&slow));
frame_->Push(&arguments);
frame_->Push(key_literal->handle());
value = EmitKeyedLoad(false);
frame_->Drop(2); // Drop key and receiver.
done.Jump(&value);
}
}
}
}

86
test/mjsunit/arguments-load-across-eval.js Normal file
View File

@ -0,0 +1,86 @@
// Copyright 2010 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.
// Tests loading of aguments across eval calls.
// Test loading across an eval call that does not shadow variables.
function testNoShadowing(x, h) {
function f() {
eval('1');
assertEquals(1, x);
assertEquals(2, h());
function g() {
assertEquals(1, x);
assertEquals(2, h());
}
g();
}
f();
}
testNoShadowing(1, function() { return 2; });
// Test loading across eval calls that do not shadow variables.
function testNoShadowing2(x, h) {
eval('1');
function f() {
eval('1');
assertEquals(1, x);
assertEquals(2, h());
function g() {
assertEquals(1, x);
assertEquals(2, h());
}
g();
}
f();
}
testNoShadowing2(1, function() { return 2; });
// Test loading across an eval call that shadows variables.
function testShadowing(x, h) {
function f() {
assertEquals(1, x);
assertEquals(2, h());
eval('var x = 3; var h = function() { return 4; };');
assertEquals(3, x);
assertEquals(4, h());
function g() {
assertEquals(3, x);
assertEquals(4, h());
}
g();
}
f();
assertEquals(1, x);
assertEquals(2, h());
}
testShadowing(1, function() { return 2; });

2
test/mjsunit/property-load-across-eval.js
View File

@ -41,6 +41,7 @@ function testNoShadowing() {
function f() {
eval('1');
assertEquals(1, x);
try { typeof(asdf); } catch(e) { assertUnreachable(); }
assertEquals(2, y);
assertEquals('global', global_function());
assertEquals('local', local_function());
@ -60,6 +61,7 @@ function testNoShadowing() {
assertEquals('const_local', local_const_initialized());
function g() {
assertEquals(1, x);
try { typeof(asdf); } catch(e) { assertUnreachable(); }
assertEquals(2, y);
assertEquals('global', global_function());
assertEquals('local', local_function());