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95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
//==- llvm/Analysis/ConstantsScanner.h - Iterate over constants -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This class implements an iterator to walk through the constants referenced by
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// a method. This is used by the Bytecode & Assembly writers to build constant
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// pools.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_CONSTANTSSCANNER_H
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#define LLVM_ANALYSIS_CONSTANTSSCANNER_H
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#include "llvm/Support/InstIterator.h"
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#include "llvm/Instruction.h"
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#include "llvm/ADT/iterator"
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namespace llvm {
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class Constant;
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class constant_iterator : public forward_iterator<const Constant, ptrdiff_t> {
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const_inst_iterator InstI; // Method instruction iterator
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unsigned OpIdx; // Operand index
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typedef constant_iterator _Self;
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inline bool isAtConstant() const {
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assert(!InstI.atEnd() && OpIdx < InstI->getNumOperands() &&
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"isAtConstant called with invalid arguments!");
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return isa<Constant>(InstI->getOperand(OpIdx));
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}
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public:
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inline constant_iterator(const Function *F) : InstI(inst_begin(F)), OpIdx(0) {
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// Advance to first constant... if we are not already at constant or end
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if (InstI != inst_end(F) && // InstI is valid?
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(InstI->getNumOperands() == 0 || !isAtConstant())) // Not at constant?
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operator++();
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}
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inline constant_iterator(const Function *F, bool) // end ctor
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: InstI(inst_end(F)), OpIdx(0) {
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}
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inline bool operator==(const _Self& x) const { return OpIdx == x.OpIdx &&
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InstI == x.InstI; }
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inline bool operator!=(const _Self& x) const { return !operator==(x); }
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inline pointer operator*() const {
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assert(isAtConstant() && "Dereferenced an iterator at the end!");
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return cast<Constant>(InstI->getOperand(OpIdx));
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}
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inline pointer operator->() const { return operator*(); }
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inline _Self& operator++() { // Preincrement implementation
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++OpIdx;
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do {
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unsigned NumOperands = InstI->getNumOperands();
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while (OpIdx < NumOperands && !isAtConstant()) {
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++OpIdx;
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}
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if (OpIdx < NumOperands) return *this; // Found a constant!
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++InstI;
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OpIdx = 0;
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} while (!InstI.atEnd());
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return *this; // At the end of the method
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}
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inline _Self operator++(int) { // Postincrement
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_Self tmp = *this; ++*this; return tmp;
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}
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inline bool atEnd() const { return InstI.atEnd(); }
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};
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inline constant_iterator constant_begin(const Function *F) {
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return constant_iterator(F);
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}
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inline constant_iterator constant_end(const Function *F) {
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return constant_iterator(F, true);
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}
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} // End llvm namespace
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#endif
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