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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef jit_AliasAnalysisShared_h
#define jit_AliasAnalysisShared_h
#include "jit/MIR.h"
#include "jit/MIRGraph.h"
namespace js {
namespace jit {
class MIRGraph;
class AliasAnalysisShared
{
protected:
MIRGenerator* mir;
MIRGraph& graph_;
public:
AliasAnalysisShared(MIRGenerator* mir, MIRGraph& graph)
: mir(mir),
graph_(graph)
{}
virtual MOZ_MUST_USE bool analyze() {
return true;
}
static MDefinition::AliasType genericMightAlias(const MDefinition* load,
const MDefinition* store);
protected:
void spewDependencyList();
TempAllocator& alloc() const {
return graph_.alloc();
}
};
// Iterates over the flags in an AliasSet.
class AliasSetIterator
{
private:
uint32_t flags;
unsigned pos;
public:
explicit AliasSetIterator(AliasSet set)
: flags(set.flags()), pos(0)
{
while (flags && (flags & 1) == 0) {
flags >>= 1;
pos++;
}
}
AliasSetIterator& operator ++(int) {
do {
flags >>= 1;
pos++;
} while (flags && (flags & 1) == 0);
return *this;
}
explicit operator bool() const {
return !!flags;
}
unsigned operator*() const {
MOZ_ASSERT(pos < AliasSet::NumCategories);
return pos;
}
};
} // namespace jit
} // namespace js
#endif /* jit_AliasAnalysisShared_h */
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