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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* 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_AliasAnalysis_h
#define jit_AliasAnalysis_h
#include "jit/MIR.h"
#include "jit/MIRGraph.h"
namespace js {
namespace jit {
class LoopAliasInfo;
class AliasAnalysis {
MIRGenerator* mir;
MIRGraph& graph_;
LoopAliasInfo* loop_;
void spewDependencyList();
TempAllocator& alloc() const { return graph_.alloc(); }
public:
AliasAnalysis(MIRGenerator* mir, MIRGraph& graph)
: mir(mir), graph_(graph), loop_(nullptr) {}
[[nodiscard]] bool analyze();
};
// 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_AliasAnalysis_h */
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