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/*
* Copyright (C) 2015 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 <wtf/PrintStream.h>
#include <wtf/TaggedPtr.h>
#include <wtf/ValidatedReinterpretCast.h>
namespace JSC::Wasm {
class OMGOrigin;
class OpcodeOrigin;
}
namespace JSC::DFG {
struct Node;
}
namespace JSC { namespace B3 {
// Whoever generates B3IR can choose to put origins on values. When you do this, B3 will be able to
// account, down to the machine code, which instruction corresponds to which origin. B3
// transformations must preserve Origins carefully. It's an error to write a transformation that
// either drops Origins or lies about them.
class Origin {
public:
enum OriginType : uint8_t {
InvalidTag,
DFGOriginPtr,
OMGOriginPtr,
PackedWasmOrigin,
};
explicit Origin(const Wasm::OMGOrigin* data)
: m_data(data, OMGOriginPtr)
{
}
explicit Origin(const DFG::Node* data)
: m_data(data, DFGOriginPtr)
{
}
explicit Origin()
: m_data(nullptr)
{ }
explicit operator bool() const { return !!m_data.bits(); }
bool isDFGOrigin() const { return !m_data.bits() || m_data.tag() == DFGOriginPtr; }
bool isOMGOrigin() const { return !m_data.bits() || m_data.tag() == OMGOriginPtr; }
bool isPackedWasmOrigin() const { return !m_data.bits() || m_data.tag() == PackedWasmOrigin; }
Wasm::OMGOrigin* omgOrigin() const
{
ASSERT(isOMGOrigin());
return VALIDATED_REINTERPRET_CAST("OMGOrigin", Wasm::OMGOrigin, m_data.ptr());
}
DFG::Node* dfgOrigin() const
{
ASSERT(isDFGOrigin());
return std::bit_cast<DFG::Node*>(m_data.ptr());
}
const Wasm::OMGOrigin* maybeOMGOrigin() const { return isOMGOrigin() ? omgOrigin() : nullptr; }
// You should avoid using this. Use OriginDump instead.
void dump(PrintStream&) const;
private:
// See WasmOpcodeOrigin for packing details.
explicit Origin(uint64_t data)
: m_data(data, PackedWasmOrigin)
{
}
WTF::TaggedBits60 m_data;
friend class Wasm::OpcodeOrigin;
};
} } // namespace JSC::B3
#endif // ENABLE(B3_JIT)
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