mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-10-30 16:17:05 +00:00
f1925cb05c
with the class that it documents. Patch suggested by Vladimir Prus. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28304 91177308-0d34-0410-b5e6-96231b3b80d8
82 lines
3.1 KiB
C++
82 lines
3.1 KiB
C++
//===-- 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.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
/// @file This file declares the MachineConstantPool class which is an abstract
|
|
/// constant pool to keep track of constants referenced by a function.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CODEGEN_MACHINECONSTANTPOOL_H
|
|
#define LLVM_CODEGEN_MACHINECONSTANTPOOL_H
|
|
|
|
#include <vector>
|
|
#include <iosfwd>
|
|
|
|
namespace llvm {
|
|
|
|
class Constant;
|
|
class TargetData;
|
|
|
|
/// This class is a data container for one entry in a MachineConstantPool.
|
|
/// It contains a pointer to the value and an offset from the start of
|
|
/// the constant pool.
|
|
/// @brief An entry in a MachineConstantPool
|
|
struct MachineConstantPoolEntry {
|
|
Constant *Val; ///< The constant itself.
|
|
unsigned Offset; ///< The offset of the constant from the start of the pool.
|
|
MachineConstantPoolEntry(Constant *V, unsigned O) : Val(V), Offset(O) {}
|
|
};
|
|
|
|
/// 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.
|
|
/// @brief The machine constant pool.
|
|
class MachineConstantPool {
|
|
const TargetData *TD; ///< The machine's TargetData.
|
|
unsigned PoolAlignment; ///< The alignment for the pool.
|
|
std::vector<MachineConstantPoolEntry> Constants; ///< The pool of constants.
|
|
public:
|
|
/// @brief The only constructor.
|
|
MachineConstantPool(const TargetData *td) : TD(td), PoolAlignment(1) {}
|
|
|
|
/// getConstantPoolAlignment - Return the log2 of the alignment required by
|
|
/// the whole constant pool, of which the first element must be aligned.
|
|
unsigned getConstantPoolAlignment() const { return PoolAlignment; }
|
|
|
|
/// getConstantPoolIndex - Create a new entry in the constant pool or return
|
|
/// an existing one. User must specify an alignment in bytes for the object.
|
|
unsigned getConstantPoolIndex(Constant *C, unsigned Alignment);
|
|
|
|
/// isEmpty - Return true if this constant pool contains no constants.
|
|
bool isEmpty() const { return Constants.empty(); }
|
|
|
|
const std::vector<MachineConstantPoolEntry> &getConstants() const {
|
|
return Constants;
|
|
}
|
|
|
|
/// print - Used by the MachineFunction printer to print information about
|
|
/// constant pool 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
|
|
|
|
#endif
|