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Remove Unboxed Objects in ScalarReplacement

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A note about the Scalar Replacement Changes: The M{Load,Store}Unboxed*
instructions in theory could be used to manipulate and analyze typed
arrays. However, TypedArrays should already be excluded from eligibility
because of the potential for cross-thread sharing in a SharedArrayBuffer
world, and so the only support in Scalar Replacement here is for Unboxed
Objects, meaning it can all be removed.
This commit is contained in:
wolfbeast 2019-05-15 13:18:33 +00:00 • committed by Roy Tam
commit d7714885d1
1 changed files with 0 additions and 112 deletions
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112
js/src/jit/ScalarReplacement.cpp
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@ -13,7 +13,6 @@
#include "jit/MIR.h"
#include "jit/MIRGenerator.h"
#include "jit/MIRGraph.h"
#include "vm/UnboxedObject.h"
#include "jsobjinlines.h"
@ -183,25 +182,6 @@ IsObjectEscaped(MInstruction* ins, JSObject* objDefault)
JitSpewDef(JitSpew_Escape, "is escaped by\n", def);
return true;
case MDefinition::Op_LoadUnboxedScalar:
case MDefinition::Op_StoreUnboxedScalar:
case MDefinition::Op_LoadUnboxedObjectOrNull:
case MDefinition::Op_StoreUnboxedObjectOrNull:
case MDefinition::Op_LoadUnboxedString:
case MDefinition::Op_StoreUnboxedString:
// Not escaped if it is the first argument.
if (def->indexOf(*i) != 0) {
JitSpewDef(JitSpew_Escape, "is escaped by\n", def);
return true;
}
if (!def->getOperand(1)->isConstant()) {
JitSpewDef(JitSpew_Escape, "is addressed with unknown index\n", def);
return true;
}
break;
case MDefinition::Op_PostWriteBarrier:
break;
@ -305,12 +285,6 @@ class ObjectMemoryView : public MDefinitionVisitorDefaultNoop
void visitGuardShape(MGuardShape* ins);
void visitFunctionEnvironment(MFunctionEnvironment* ins);
void visitLambda(MLambda* ins);
void visitStoreUnboxedScalar(MStoreUnboxedScalar* ins);
void visitLoadUnboxedScalar(MLoadUnboxedScalar* ins);
void visitStoreUnboxedObjectOrNull(MStoreUnboxedObjectOrNull* ins);
void visitLoadUnboxedObjectOrNull(MLoadUnboxedObjectOrNull* ins);
void visitStoreUnboxedString(MStoreUnboxedString* ins);
void visitLoadUnboxedString(MLoadUnboxedString* ins);
private:
void storeOffset(MInstruction* ins, size_t offset, MDefinition* value);
@ -656,21 +630,6 @@ ObjectMemoryView::visitLambda(MLambda* ins)
ins->setIncompleteObject();
}
static size_t
GetOffsetOf(MDefinition* index, size_t width, int32_t baseOffset)
{
int32_t idx = index->toConstant()->toInt32();
MOZ_ASSERT(idx >= 0);
MOZ_ASSERT(baseOffset >= 0 && size_t(baseOffset) >= UnboxedPlainObject::offsetOfData());
return idx * width + baseOffset - UnboxedPlainObject::offsetOfData();
}
static size_t
GetOffsetOf(MDefinition* index, Scalar::Type type, int32_t baseOffset)
{
return GetOffsetOf(index, Scalar::byteSize(type), baseOffset);
}
void
ObjectMemoryView::storeOffset(MInstruction* ins, size_t offset, MDefinition* value)
{
@ -700,77 +659,6 @@ ObjectMemoryView::loadOffset(MInstruction* ins, size_t offset)
ins->block()->discard(ins);
}
void
ObjectMemoryView::visitStoreUnboxedScalar(MStoreUnboxedScalar* ins)
{
// Skip stores made on other objects.
if (ins->elements() != obj_)
return;
size_t offset = GetOffsetOf(ins->index(), ins->storageType(), ins->offsetAdjustment());
storeOffset(ins, offset, ins->value());
}
void
ObjectMemoryView::visitLoadUnboxedScalar(MLoadUnboxedScalar* ins)
{
// Skip loads made on other objects.
if (ins->elements() != obj_)
return;
// Replace load by the slot value.
size_t offset = GetOffsetOf(ins->index(), ins->storageType(), ins->offsetAdjustment());
loadOffset(ins, offset);
}
void
ObjectMemoryView::visitStoreUnboxedObjectOrNull(MStoreUnboxedObjectOrNull* ins)
{
// Skip stores made on other objects.
if (ins->elements() != obj_)
return;
// Clone the state and update the slot value.
size_t offset = GetOffsetOf(ins->index(), sizeof(uintptr_t), ins->offsetAdjustment());
storeOffset(ins, offset, ins->value());
}
void
ObjectMemoryView::visitLoadUnboxedObjectOrNull(MLoadUnboxedObjectOrNull* ins)
{
// Skip loads made on other objects.
if (ins->elements() != obj_)
return;
// Replace load by the slot value.
size_t offset = GetOffsetOf(ins->index(), sizeof(uintptr_t), ins->offsetAdjustment());
loadOffset(ins, offset);
}
void
ObjectMemoryView::visitStoreUnboxedString(MStoreUnboxedString* ins)
{
// Skip stores made on other objects.
if (ins->elements() != obj_)
return;
// Clone the state and update the slot value.
size_t offset = GetOffsetOf(ins->index(), sizeof(uintptr_t), ins->offsetAdjustment());
storeOffset(ins, offset, ins->value());
}
void
ObjectMemoryView::visitLoadUnboxedString(MLoadUnboxedString* ins)
{
// Skip loads made on other objects.
if (ins->elements() != obj_)
return;
// Replace load by the slot value.
size_t offset = GetOffsetOf(ins->index(), sizeof(uintptr_t), ins->offsetAdjustment());
loadOffset(ins, offset);
}
static bool
IndexOf(MDefinition* ins, int32_t* res)
{