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/*
* Copyright (C) 2015-2023 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 "AirFrequentedBlock.h"
#include "AirInst.h"
#include "B3SuccessorCollection.h"
#include <wtf/Noncopyable.h>
#include <wtf/TZoneMalloc.h>
namespace JSC { namespace B3 {
template<typename> class GenericBlockInsertionSet;
namespace Air {
class BlockInsertionSet;
class Code;
class InsertionSet;
class PhaseInsertionSet;
class BasicBlock {
WTF_MAKE_NONCOPYABLE(BasicBlock);
WTF_MAKE_TZONE_ALLOCATED(BasicBlock);
public:
static const char* const dumpPrefix;
static constexpr unsigned uninsertedIndex = UINT_MAX;
typedef Vector<Inst> InstList;
typedef Vector<BasicBlock*, 2> PredecessorList;
typedef Vector<FrequentedBlock, 2> SuccessorList;
unsigned index() const { return m_index; }
// This method is exposed for phases that mess with the layout of basic blocks. Currently that means just
// optimizeBlockOrder().
void setIndex(unsigned index) { m_index = index; }
unsigned size() const { return m_insts.size(); }
InstList::iterator begin() { return m_insts.begin(); }
InstList::iterator end() { return m_insts.end(); }
InstList::const_iterator begin() const { return m_insts.begin(); }
InstList::const_iterator end() const { return m_insts.end(); }
const Inst& at(unsigned index) const { return m_insts[index]; }
Inst& at(unsigned index) { return m_insts[index]; }
Inst* get(unsigned index)
{
return index < size() ? &at(index) : nullptr;
}
const Inst& last() const { return m_insts.last(); }
Inst& last() { return m_insts.last(); }
void resize(unsigned size) { m_insts.resize(size); }
const InstList& insts() const { return m_insts; }
InstList& insts() { return m_insts; }
template<typename Inst>
Inst& appendInst(Inst&& inst)
{
m_insts.append(std::forward<Inst>(inst));
return m_insts.last();
}
template<typename... Arguments>
Inst& append(Arguments&&... arguments)
{
m_insts.append(Inst(std::forward<Arguments>(arguments)...));
return m_insts.last();
}
// The "0" case is the case to which the branch jumps, so the "then" case. The "1" case is the
// "else" case, and is used to represent the fall-through of a conditional branch.
unsigned numSuccessors() const { return m_successors.size(); }
FrequentedBlock successor(unsigned index) const { return m_successors[index]; }
FrequentedBlock& successor(unsigned index) { return m_successors[index]; }
const SuccessorList& successors() const { return m_successors; }
SuccessorList& successors() { return m_successors; }
JS_EXPORT_PRIVATE void setSuccessors(FrequentedBlock);
JS_EXPORT_PRIVATE void setSuccessors(FrequentedBlock, FrequentedBlock);
BasicBlock* successorBlock(unsigned index) const { return successor(index).block(); }
BasicBlock*& successorBlock(unsigned index) { return successor(index).block(); }
SuccessorCollection<BasicBlock, SuccessorList> successorBlocks()
{
return SuccessorCollection<BasicBlock, SuccessorList>(m_successors);
}
SuccessorCollection<const BasicBlock, const SuccessorList> successorBlocks() const
{
return SuccessorCollection<const BasicBlock, const SuccessorList>(m_successors);
}
unsigned numPredecessors() const { return m_predecessors.size(); }
BasicBlock* predecessor(unsigned index) const { return m_predecessors[index]; }
BasicBlock*& predecessor(unsigned index) { return m_predecessors[index]; }
const PredecessorList& predecessors() const { return m_predecessors; }
PredecessorList& predecessors() { return m_predecessors; }
bool addPredecessor(BasicBlock*);
bool removePredecessor(BasicBlock*);
bool replacePredecessor(BasicBlock* from, BasicBlock* to);
bool containsPredecessor(BasicBlock* predecessor) const { return m_predecessors.contains(predecessor); }
double frequency() const { return m_frequency; }
void dump(PrintStream&) const;
void deepDump(PrintStream&) const;
void dumpHeader(PrintStream&) const;
void dumpFooter(PrintStream&) const;
private:
friend class BlockInsertionSet;
friend class Code;
friend class InsertionSet;
friend class PhaseInsertionSet;
template<typename> friend class B3::GenericBlockInsertionSet;
BasicBlock(unsigned index, double frequency);
unsigned m_index;
InstList m_insts;
SuccessorList m_successors;
PredecessorList m_predecessors;
double m_frequency;
};
class DeepBasicBlockDump {
public:
DeepBasicBlockDump(const BasicBlock* block)
: m_block(block)
{
}
void dump(PrintStream& out) const
{
if (m_block)
m_block->deepDump(out);
else
out.print("<null>");
}
private:
const BasicBlock* m_block;
};
inline DeepBasicBlockDump deepDump(const BasicBlock* block)
{
return DeepBasicBlockDump(block);
}
} } } // namespace JSC::B3::Air
#endif // ENABLE(B3_JIT)
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