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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.
*/
#include "config.h"
#include "B3SwitchValue.h"
#if ENABLE(B3_JIT)
#include "B3BasicBlockInlines.h"
#include "B3ValueInlines.h"
#include <wtf/ListDump.h>
namespace JSC { namespace B3 {
SwitchValue::~SwitchValue() = default;
BasicBlock* SwitchValue::fallThrough(const BasicBlock* owner)
{
ASSERT(hasFallThrough());
BasicBlock* fallThrough = owner->successor(owner->numSuccessors() - 1).block();
ASSERT(fallThrough == owner->fallThrough().block());
return fallThrough;
}
bool SwitchValue::hasFallThrough(const BasicBlock* block) const
{
unsigned numSuccessors = block->numSuccessors();
unsigned numValues = m_values.size();
RELEASE_ASSERT(numValues == numSuccessors || numValues + 1 == numSuccessors);
return numValues + 1 == numSuccessors;
}
bool SwitchValue::hasFallThrough() const
{
return hasFallThrough(owner);
}
void SwitchValue::setFallThrough(BasicBlock* block, const FrequentedBlock& target)
{
if (!hasFallThrough())
block->successors().append(target);
else
block->successors().last() = target;
ASSERT(hasFallThrough(block));
}
void SwitchValue::appendCase(BasicBlock* block, const SwitchCase& switchCase)
{
if (!hasFallThrough())
block->successors().append(switchCase.target());
else {
block->successors().append(block->successors().last());
block->successor(block->numSuccessors() - 2) = switchCase.target();
}
m_values.append(switchCase.caseValue());
}
void SwitchValue::setFallThrough(const FrequentedBlock& target)
{
setFallThrough(owner, target);
}
void SwitchValue::appendCase(const SwitchCase& switchCase)
{
appendCase(owner, switchCase);
}
void SwitchValue::dumpSuccessors(const BasicBlock* block, PrintStream& out) const
{
// We must not crash due to a number-of-successors mismatch! Someone debugging a
// number-of-successors bug will want to dump IR!
if (numCaseValues() + 1 != block->numSuccessors()) {
Value::dumpSuccessors(block, out);
return;
}
out.print(cases(block));
}
void SwitchValue::dumpMeta(CommaPrinter& comma, PrintStream& out) const
{
out.print(comma, "cases = [", listDump(m_values), "]");
}
SwitchValue::SwitchValue(Origin origin, Value* child)
: Value(CheckedOpcode, Switch, Void, One, origin, child)
{
}
} } // namespace JSC::B3
#endif // ENABLE(B3_JIT)
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