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//===-- CodeGen/MachineConstantPool.h - Abstract Constant Pool --*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
// The MachineConstantPool class keeps track of constants referenced by a
// function which must be spilled to memory. This is used for constants which
// are unable to be used directly as operands to instructions, which typically
// include floating point and large integer constants.
// Instructions reference the address of these constant pool constants through
// the use of MO_ConstantPoolIndex values. When emitting assembly or machine
// code, these virtual address references are converted to refer to the
// address of the function constant pool values.
#include <vector>
namespace llvm {
class Constant;
class MachineConstantPool {
std::vector<Constant*> Constants;
/// getConstantPoolIndex - Create a new entry in the constant pool or return
/// an existing one.
unsigned getConstantPoolIndex(Constant *C) {
// Check to see if we already have this constant.
// FIXME, this could be made much more efficient for large constant pools.
for (unsigned i = 0, e = Constants.size(); i != e; ++i)
if (Constants[i] == C)
return i;
return Constants.size()-1;
/// isEmpty - Return true if this constant pool contains no constants.
bool isEmpty() const { return Constants.empty(); }
const std::vector<Constant*> &getConstants() const { return Constants; }
/// print - Used by the MachineFunction printer to print information about
/// stack objects. Implemented in MachineFunction.cpp
void print(std::ostream &OS) const;
/// dump - Call print(std::cerr) to be called from the debugger.
void dump() const;
} // End llvm namespace