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/*
* Copyright (C) 2015-2016 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.
*/
#pragma once
#if ENABLE(B3_JIT)
#include "B3HeapRange.h"
#include "B3Value.h"
namespace JSC { namespace B3 {
// FIXME: We want to allow fenced memory accesses on ARM.
// https://bugs.webkit.org/show_bug.cgi?id=162349
class JS_EXPORT_PRIVATE MemoryValue : public Value {
public:
static bool accepts(Kind kind)
{
switch (kind.opcode()) {
case Load8Z:
case Load8S:
case Load16Z:
case Load16S:
case Load:
case Store8:
case Store16:
case Store:
return true;
default:
return false;
}
}
static bool isStore(Kind kind)
{
switch (kind.opcode()) {
case Store8:
case Store16:
case Store:
return true;
default:
return false;
}
}
static bool isLoad(Kind kind)
{
return accepts(kind) && !isStore(kind);
}
~MemoryValue();
int32_t offset() const { return m_offset; }
void setOffset(int32_t offset) { m_offset = offset; }
const HeapRange& range() const { return m_range; }
void setRange(const HeapRange& range) { m_range = range; }
bool isStore() const { return type() == Void; }
bool isLoad() const { return type() != Void; }
size_t accessByteSize() const;
protected:
void dumpMeta(CommaPrinter& comma, PrintStream&) const override;
Value* cloneImpl() const override;
private:
friend class Procedure;
// Use this form for Load (but not Load8Z, Load8S, or any of the Loads that have a suffix that
// describes the returned type).
MemoryValue(Kind kind, Type type, Origin origin, Value* pointer, int32_t offset = 0)
: Value(CheckedOpcode, kind, type, origin, pointer)
, m_offset(offset)
, m_range(HeapRange::top())
{
if (!ASSERT_DISABLED) {
switch (kind.opcode()) {
case Load:
break;
case Load8Z:
case Load8S:
case Load16Z:
case Load16S:
ASSERT(type == Int32);
break;
case Store8:
case Store16:
case Store:
ASSERT(type == Void);
break;
default:
ASSERT_NOT_REACHED();
}
}
}
// Use this form for loads where the return type is implied.
MemoryValue(Kind kind, Origin origin, Value* pointer, int32_t offset = 0)
: MemoryValue(kind, Int32, origin, pointer, offset)
{
}
// Use this form for stores.
MemoryValue(Kind kind, Origin origin, Value* value, Value* pointer, int32_t offset = 0)
: Value(CheckedOpcode, kind, Void, origin, value, pointer)
, m_offset(offset)
, m_range(HeapRange::top())
{
if (!ASSERT_DISABLED) {
switch (kind.opcode()) {
case Store8:
case Store16:
case Store:
break;
default:
ASSERT_NOT_REACHED();
break;
}
}
}
int32_t m_offset { 0 };
HeapRange m_range;
};
} } // namespace JSC::B3
#endif // ENABLE(B3_JIT)
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