Allow monomorphic loads when static type is known.

This allows Crankshaft to generate monomorphic loads when the receiver
type is statically known even though the load site has polymorphic type
feedback. This applies to inlined constructor calls and literals.

R=jkummerow@chromium.org
TEST=mjsunit/compiler/property-static

Review URL: https://codereview.chromium.org/12051058

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13500 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
parent 04c8093f
......@@ -571,6 +571,11 @@ void HValue::PrintNameTo(StringStream* stream) {
}
bool HValue::HasMonomorphicJSObjectType() {
return !GetMonomorphicJSObjectMap().is_null();
}
bool HValue::UpdateInferredType() {
HType type = CalculateInferredType();
bool result = (!type.Equals(type_));
......
......@@ -770,6 +770,14 @@ class HValue: public ZoneObject {
const char* Mnemonic() const;
// Type information helpers.
bool HasMonomorphicJSObjectType();
// TODO(mstarzinger): For now instructions can override this function to
// specify statically known types, once HType can convey more information
// it should be based on the HType.
virtual Handle<Map> GetMonomorphicJSObjectMap() { return Handle<Map>(); }
// Updated the inferred type of this instruction and returns true if
// it has changed.
bool UpdateInferredType();
......@@ -5019,6 +5027,10 @@ class HAllocateObject: public HTemplateInstruction<1> {
virtual Representation RequiredInputRepresentation(int index) {
return Representation::Tagged();
}
virtual Handle<Map> GetMonomorphicJSObjectMap() {
ASSERT(constructor()->has_initial_map());
return Handle<Map>(constructor()->initial_map());
}
virtual HType CalculateInferredType();
DECLARE_CONCRETE_INSTRUCTION(AllocateObject)
......@@ -5086,6 +5098,9 @@ class HFastLiteral: public HMaterializedLiteral<1> {
virtual Representation RequiredInputRepresentation(int index) {
return Representation::Tagged();
}
virtual Handle<Map> GetMonomorphicJSObjectMap() {
return Handle<Map>(boilerplate()->map());
}
virtual HType CalculateInferredType();
DECLARE_CONCRETE_INSTRUCTION(FastLiteral)
......
......@@ -6796,12 +6796,16 @@ void HOptimizedGraphBuilder::VisitProperty(Property* expr) {
} else if (expr->key()->IsPropertyName()) {
Handle<String> name = expr->key()->AsLiteral()->AsPropertyName();
SmallMapList* types = expr->GetReceiverTypes();
HValue* object = Top();
bool monomorphic = expr->IsMonomorphic();
Handle<Map> map;
bool monomorphic = false;
if (expr->IsMonomorphic()) {
map = types->first();
if (map->is_dictionary_map()) monomorphic = false;
monomorphic = !map->is_dictionary_map();
} else if (object->HasMonomorphicJSObjectType()) {
map = object->GetMonomorphicJSObjectMap();
monomorphic = !map->is_dictionary_map();
}
if (monomorphic) {
Handle<JSFunction> getter;
......
// Copyright 2013 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Flags: --allow-natives-syntax
// Test usage of static type information for loads that would otherwise
// turn into polymorphic or generic loads.
// Prepare a highly polymorphic load to be used by all tests.
Object.prototype.load = function() { return this.property; };
Object.prototype.load.call({ A:0, property:10 });
Object.prototype.load.call({ A:0, B:0, property:11 });
Object.prototype.load.call({ A:0, B:0, C:0, property:12 });
Object.prototype.load.call({ A:0, B:0, C:0, D:0, property:13 });
Object.prototype.load.call({ A:0, B:0, C:0, D:0, E:0, property:14 });
Object.prototype.load.call({ A:0, B:0, C:0, D:0, E:0, F:0, property:15 });
// Test for object literals.
(function() {
function f(x) {
var object = { property:x };
return object.load();
}
assertSame(1, f(1));
assertSame(2, f(2));
%OptimizeFunctionOnNextCall(f);
assertSame(3, f(3));
})();
// Test for inlined constructors.
(function() {
function c(x) {
this.property = x;
}
function f(x) {
var object = new c(x);
return object.load();
}
assertSame(1, f(1));
assertSame(2, f(2));
%OptimizeFunctionOnNextCall(f);
assertSame(3, f(3));
})();
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