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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "jit/AliasAnalysisShared.h"
#include "jit/MIR.h"
namespace js {
namespace jit {
void
AliasAnalysisShared::spewDependencyList()
{
#ifdef JS_JITSPEW
if (JitSpewEnabled(JitSpew_AliasSummaries)) {
Fprinter &print = JitSpewPrinter();
JitSpewHeader(JitSpew_AliasSummaries);
print.printf("Dependency list for other passes:\n");
for (ReversePostorderIterator block(graph_.rpoBegin()); block != graph_.rpoEnd(); block++) {
for (MInstructionIterator def(block->begin()), end(block->begin(block->lastIns()));
def != end;
++def)
{
if (!def->dependency())
continue;
if (!def->getAliasSet().isLoad())
continue;
JitSpewHeader(JitSpew_AliasSummaries);
print.printf(" ");
MDefinition::PrintOpcodeName(print, def->op());
print.printf("%d marked depending on ", def->id());
MDefinition::PrintOpcodeName(print, def->dependency()->op());
print.printf("%d\n", def->dependency()->id());
}
}
}
#endif
}
// Unwrap any slot or element to its corresponding object.
static inline const MDefinition*
MaybeUnwrap(const MDefinition* object)
{
while (object->isSlots() || object->isElements() || object->isConvertElementsToDoubles()) {
MOZ_ASSERT(object->numOperands() == 1);
object = object->getOperand(0);
}
if (object->isTypedArrayElements())
return nullptr;
if (object->isTypedObjectElements())
return nullptr;
if (object->isConstantElements())
return nullptr;
return object;
}
// Get the object of any load/store. Returns nullptr if not tied to
// an object.
static inline const MDefinition*
GetObject(const MDefinition* ins)
{
if (!ins->getAliasSet().isStore() && !ins->getAliasSet().isLoad())
return nullptr;
// Note: only return the object if that objects owns that property.
// I.e. the poperty isn't on the prototype chain.
const MDefinition* object = nullptr;
switch (ins->op()) {
case MDefinition::Op_InitializedLength:
case MDefinition::Op_LoadElement:
case MDefinition::Op_LoadUnboxedScalar:
case MDefinition::Op_LoadUnboxedObjectOrNull:
case MDefinition::Op_LoadUnboxedString:
case MDefinition::Op_StoreElement:
case MDefinition::Op_StoreUnboxedObjectOrNull:
case MDefinition::Op_StoreUnboxedString:
case MDefinition::Op_StoreUnboxedScalar:
case MDefinition::Op_SetInitializedLength:
case MDefinition::Op_ArrayLength:
case MDefinition::Op_SetArrayLength:
case MDefinition::Op_TypedObjectDescr:
case MDefinition::Op_Slots:
case MDefinition::Op_Elements:
case MDefinition::Op_MaybeCopyElementsForWrite:
case MDefinition::Op_MaybeToDoubleElement:
case MDefinition::Op_TypedArrayLength:
case MDefinition::Op_SetTypedObjectOffset:
case MDefinition::Op_SetDisjointTypedElements:
case MDefinition::Op_ArrayPopShift:
case MDefinition::Op_ArrayPush:
case MDefinition::Op_LoadTypedArrayElementHole:
case MDefinition::Op_StoreTypedArrayElementHole:
case MDefinition::Op_LoadFixedSlot:
case MDefinition::Op_LoadFixedSlotAndUnbox:
case MDefinition::Op_StoreFixedSlot:
case MDefinition::Op_GetPropertyPolymorphic:
case MDefinition::Op_SetPropertyPolymorphic:
case MDefinition::Op_GuardShape:
case MDefinition::Op_GuardReceiverPolymorphic:
case MDefinition::Op_GuardObjectGroup:
case MDefinition::Op_GuardObjectIdentity:
case MDefinition::Op_GuardClass:
case MDefinition::Op_LoadSlot:
case MDefinition::Op_StoreSlot:
case MDefinition::Op_InArray:
case MDefinition::Op_LoadElementHole:
case MDefinition::Op_TypedArrayElements:
case MDefinition::Op_TypedObjectElements:
object = ins->getOperand(0);
break;
case MDefinition::Op_GetPropertyCache:
case MDefinition::Op_CallGetProperty:
case MDefinition::Op_LoadTypedArrayElementStatic:
case MDefinition::Op_StoreTypedArrayElementStatic:
case MDefinition::Op_GetDOMProperty:
case MDefinition::Op_GetDOMMember:
case MDefinition::Op_Call:
case MDefinition::Op_Compare:
case MDefinition::Op_GetArgumentsObjectArg:
case MDefinition::Op_SetArgumentsObjectArg:
case MDefinition::Op_GetFrameArgument:
case MDefinition::Op_SetFrameArgument:
case MDefinition::Op_CompareExchangeTypedArrayElement:
case MDefinition::Op_AtomicExchangeTypedArrayElement:
case MDefinition::Op_AtomicTypedArrayElementBinop:
case MDefinition::Op_AsmJSLoadHeap:
case MDefinition::Op_AsmJSStoreHeap:
case MDefinition::Op_WasmLoad:
case MDefinition::Op_WasmStore:
case MDefinition::Op_AsmJSCompareExchangeHeap:
case MDefinition::Op_AsmJSAtomicBinopHeap:
case MDefinition::Op_WasmLoadGlobalVar:
case MDefinition::Op_WasmStoreGlobalVar:
case MDefinition::Op_ArrayJoin:
case MDefinition::Op_ArraySlice:
case MDefinition::Op_StoreElementHole:
case MDefinition::Op_FallibleStoreElement:
return nullptr;
default:
#ifdef DEBUG
// Crash when the default aliasSet is overriden, but when not added in the list above.
if (!ins->getAliasSet().isStore() || ins->getAliasSet().flags() != AliasSet::Flag::Any)
MOZ_CRASH("Overridden getAliasSet without updating AliasAnalysisShared GetObject");
#endif
return nullptr;
}
MOZ_ASSERT(!ins->getAliasSet().isStore() || ins->getAliasSet().flags() != AliasSet::Flag::Any);
object = MaybeUnwrap(object);
MOZ_ASSERT_IF(object, object->type() == MIRType::Object);
return object;
}
// Generic comparing if a load aliases a store using TI information.
MDefinition::AliasType
AliasAnalysisShared::genericMightAlias(const MDefinition* load, const MDefinition* store)
{
const MDefinition* loadObject = GetObject(load);
const MDefinition* storeObject = GetObject(store);
if (!loadObject || !storeObject)
return MDefinition::AliasType::MayAlias;
if (!loadObject->resultTypeSet() || !storeObject->resultTypeSet())
return MDefinition::AliasType::MayAlias;
if (loadObject->resultTypeSet()->objectsIntersect(storeObject->resultTypeSet()))
return MDefinition::AliasType::MayAlias;
return MDefinition::AliasType::NoAlias;
}
} // namespace jit
} // namespace js
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