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constant pool entries. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26075 91177308-0d34-0410-b5e6-96231b3b80d8
83 lines
2.8 KiB
C++
83 lines
2.8 KiB
C++
//===-- CodeGen/MachineConstantPool.h - Abstract Constant Pool --*- 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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// The MachineConstantPool class keeps track of constants referenced by a
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// function which must be spilled to memory. This is used for constants which
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// are unable to be used directly as operands to instructions, which typically
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// include floating point and large integer constants.
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//
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// Instructions reference the address of these constant pool constants through
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// the use of MO_ConstantPoolIndex values. When emitting assembly or machine
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// code, these virtual address references are converted to refer to the
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// address of the function constant pool values.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MACHINECONSTANTPOOL_H
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#define LLVM_CODEGEN_MACHINECONSTANTPOOL_H
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#include <vector>
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#include <iosfwd>
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#include <cassert>
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namespace llvm {
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class Constant;
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/// MachineConstantPoolEntry - One entry in the constant pool.
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///
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struct MachineConstantPoolEntry {
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/// Val - The constant itself.
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Constant *Val;
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/// Alignment - The alignment of the constant.
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unsigned Alignment;
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MachineConstantPoolEntry(Constant *V, unsigned A) : Val(V), Alignment(A) {}
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};
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class MachineConstantPool {
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std::vector<MachineConstantPoolEntry> Constants;
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public:
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/// getConstantPoolIndex - Create a new entry in the constant pool or return
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/// an existing one. User must specify an alignment in bytes for the object.
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///
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unsigned getConstantPoolIndex(Constant *C, unsigned Alignment) {
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assert(Alignment && "Alignment must be specified!");
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// Check to see if we already have this constant.
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//
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// FIXME, this could be made much more efficient for large constant pools.
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for (unsigned i = 0, e = Constants.size(); i != e; ++i)
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if (Constants[i].Val == C && Constants[i].Alignment >= Alignment)
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return i;
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Constants.push_back(MachineConstantPoolEntry(C, Alignment));
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return Constants.size()-1;
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}
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/// isEmpty - Return true if this constant pool contains no constants.
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///
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bool isEmpty() const { return Constants.empty(); }
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const std::vector<MachineConstantPoolEntry> &getConstants() const {
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return Constants;
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}
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/// print - Used by the MachineFunction printer to print information about
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/// stack objects. Implemented in MachineFunction.cpp
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///
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void print(std::ostream &OS) const;
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/// dump - Call print(std::cerr) to be called from the debugger.
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void dump() const;
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};
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} // End llvm namespace
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#endif
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