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/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
*/
#include "config.h"
#include "FTLAbstractHeap.h"
#if ENABLE(FTL_JIT)
#include "FTLAbbreviations.h"
#include "FTLAbstractHeapRepository.h"
#include "FTLOutput.h"
#include "FTLTypedPointer.h"
#include "JSCInlines.h"
#include "Options.h"
namespace JSC { namespace FTL {
LValue AbstractHeap::tbaaMetadataSlow(const AbstractHeapRepository& repository) const
{
m_tbaaMetadata = mdNode(
repository.m_context,
mdString(repository.m_context, m_heapName),
m_parent->tbaaMetadata(repository));
return m_tbaaMetadata;
}
void AbstractHeap::decorateInstruction(LValue instruction, const AbstractHeapRepository& repository) const
{
if (!Options::useFTLTBAA())
return;
setMetadata(instruction, repository.m_tbaaKind, tbaaMetadata(repository));
}
IndexedAbstractHeap::IndexedAbstractHeap(LContext context, AbstractHeap* parent, const char* heapName, ptrdiff_t offset, size_t elementSize)
: m_heapForAnyIndex(parent, heapName)
, m_heapNameLength(strlen(heapName))
, m_offset(offset)
, m_elementSize(elementSize)
, m_scaleTerm(0)
, m_canShift(false)
{
// See if there is a common shift amount we could use instead of multiplying. Don't
// try too hard. This is just a speculative optimization to reduce load on LLVM.
for (unsigned i = 0; i < 4; ++i) {
if (1U << i == m_elementSize) {
if (i)
m_scaleTerm = constInt(intPtrType(context), i, ZeroExtend);
m_canShift = true;
break;
}
}
if (!m_canShift)
m_scaleTerm = constInt(intPtrType(context), m_elementSize, ZeroExtend);
}
IndexedAbstractHeap::~IndexedAbstractHeap()
{
}
TypedPointer IndexedAbstractHeap::baseIndex(Output& out, LValue base, LValue index, JSValue indexAsConstant, ptrdiff_t offset)
{
if (indexAsConstant.isInt32())
return out.address(base, at(indexAsConstant.asInt32()), offset);
LValue result;
if (m_canShift) {
if (!m_scaleTerm)
result = out.add(base, index);
else
result = out.add(base, out.shl(index, m_scaleTerm));
} else
result = out.add(base, out.mul(index, m_scaleTerm));
return TypedPointer(atAnyIndex(), out.addPtr(result, m_offset + offset));
}
const AbstractField& IndexedAbstractHeap::atSlow(ptrdiff_t index)
{
ASSERT(static_cast<size_t>(index) >= m_smallIndices.size());
if (UNLIKELY(!m_largeIndices))
m_largeIndices = adoptPtr(new MapType());
std::unique_ptr<AbstractField>& field = m_largeIndices->add(index, nullptr).iterator->value;
if (!field) {
field = std::make_unique<AbstractField>();
initialize(*field, index);
}
return *field;
}
void IndexedAbstractHeap::initialize(AbstractField& field, ptrdiff_t signedIndex)
{
// Build up a name of the form:
//
// heapName_hexIndex
//
// or:
//
// heapName_neg_hexIndex
//
// For example if you access an indexed heap called FooBar at index 5, you'll
// get:
//
// FooBar_5
//
// Or if you access an indexed heap called Blah at index -10, you'll get:
//
// Blah_neg_A
//
// This is important because LLVM uses the string to distinguish the types.
static const char* negSplit = "_neg_";
static const char* posSplit = "_";
bool negative;
size_t index;
if (signedIndex < 0) {
negative = true;
index = -signedIndex;
} else {
negative = false;
index = signedIndex;
}
for (unsigned power = 4; power <= sizeof(void*) * 8; power += 4) {
if (isGreaterThanNonZeroPowerOfTwo(index, power))
continue;
unsigned numHexlets = power >> 2;
size_t stringLength = m_heapNameLength + (negative ? strlen(negSplit) : strlen(posSplit)) + numHexlets;
char* characters;
m_largeIndexNames.append(CString::newUninitialized(stringLength, characters));
memcpy(characters, m_heapForAnyIndex.heapName(), m_heapNameLength);
if (negative)
memcpy(characters + m_heapNameLength, negSplit, strlen(negSplit));
else
memcpy(characters + m_heapNameLength, posSplit, strlen(posSplit));
size_t accumulator = index;
for (unsigned i = 0; i < numHexlets; ++i) {
characters[stringLength - i - 1] = lowerNibbleToASCIIHexDigit(accumulator);
accumulator >>= 4;
}
field.initialize(&m_heapForAnyIndex, characters, m_offset + signedIndex * m_elementSize);
return;
}
RELEASE_ASSERT_NOT_REACHED();
}
NumberedAbstractHeap::NumberedAbstractHeap(LContext context, AbstractHeap* heap, const char* heapName)
: m_indexedHeap(context, heap, heapName, 0, 1)
{
}
NumberedAbstractHeap::~NumberedAbstractHeap()
{
}
AbsoluteAbstractHeap::AbsoluteAbstractHeap(LContext context, AbstractHeap* heap, const char* heapName)
: m_indexedHeap(context, heap, heapName, 0, 1)
{
}
AbsoluteAbstractHeap::~AbsoluteAbstractHeap()
{
}
} } // namespace JSC::FTL
#endif // ENABLE(FTL_JIT)
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