X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FCodeGen%2FMachineConstantPool.h;h=8ed215d75bcf0fa9ca1094d710787ca7f3ac54fd;hb=af650354a1de1254c0937a9f6e9c88f447ad3889;hp=17ddcf18237443946986b3e21a65e8c14a7666a1;hpb=583bd47f777fe3eb8305872fa0eadab31e833dff;p=oota-llvm.git diff --git a/include/llvm/CodeGen/MachineConstantPool.h b/include/llvm/CodeGen/MachineConstantPool.h index 17ddcf18237..8ed215d75bc 100644 --- a/include/llvm/CodeGen/MachineConstantPool.h +++ b/include/llvm/CodeGen/MachineConstantPool.h @@ -2,12 +2,13 @@ // // 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. +// This file 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 +/// @file +/// This file declares the MachineConstantPool class which is an abstract /// constant pool to keep track of constants referenced by a function. // //===----------------------------------------------------------------------===// @@ -15,84 +16,109 @@ #ifndef LLVM_CODEGEN_MACHINECONSTANTPOOL_H #define LLVM_CODEGEN_MACHINECONSTANTPOOL_H -#include "llvm/ADT/FoldingSet.h" -#include "llvm/CodeGen/SelectionDAGNodes.h" +#include "llvm/ADT/DenseSet.h" +#include +#include #include -#include namespace llvm { -class AsmPrinter; class Constant; -class TargetData; +class FoldingSetNodeID; +class DataLayout; class TargetMachine; +class Type; class MachineConstantPool; +class raw_ostream; /// Abstract base class for all machine specific constantpool value subclasses. /// class MachineConstantPoolValue { - const Type *Ty; + virtual void anchor(); + Type *Ty; public: - MachineConstantPoolValue(const Type *ty) : Ty(ty) {} - virtual ~MachineConstantPoolValue() {}; + explicit MachineConstantPoolValue(Type *ty) : Ty(ty) {} + virtual ~MachineConstantPoolValue() {} /// getType - get type of this MachineConstantPoolValue. /// - inline const Type *getType() const { return Ty; } + Type *getType() const { return Ty; } + + /// getRelocationInfo - This method classifies the entry according to + /// whether or not it may generate a relocation entry. This must be + /// conservative, so if it might codegen to a relocatable entry, it should say + /// so. The return values are the same as Constant::getRelocationInfo(). + virtual unsigned getRelocationInfo() const = 0; + virtual int getExistingMachineCPValue(MachineConstantPool *CP, unsigned Alignment) = 0; - virtual void AddSelectionDAGCSEId(FoldingSetNodeID &ID) = 0; + virtual void addSelectionDAGCSEId(FoldingSetNodeID &ID) = 0; - /// print - Implement operator<<... - /// - virtual void print(std::ostream &O) const = 0; + /// print - Implement operator<< + virtual void print(raw_ostream &O) const = 0; }; -inline std::ostream &operator<<(std::ostream &OS, - const MachineConstantPoolValue &V) { +inline raw_ostream &operator<<(raw_ostream &OS, + const MachineConstantPoolValue &V) { V.print(OS); return OS; } + /// 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 { +class MachineConstantPoolEntry { +public: /// The constant itself. union { - Constant *ConstVal; + const Constant *ConstVal; MachineConstantPoolValue *MachineCPVal; } Val; - /// The offset of the constant from the start of the pool. The top bit is set - /// when Val is a MachineConstantPoolValue. - unsigned Offset; + /// The required alignment for this entry. The top bit is set when Val is + /// a target specific MachineConstantPoolValue. + unsigned Alignment; - MachineConstantPoolEntry(Constant *V, unsigned O) - : Offset(O) { - assert((int)Offset >= 0 && "Offset is too large"); + MachineConstantPoolEntry(const Constant *V, unsigned A) + : Alignment(A) { Val.ConstVal = V; } - MachineConstantPoolEntry(MachineConstantPoolValue *V, unsigned O) - : Offset(O){ - assert((int)Offset >= 0 && "Offset is too large"); + MachineConstantPoolEntry(MachineConstantPoolValue *V, unsigned A) + : Alignment(A) { Val.MachineCPVal = V; - Offset |= 1 << (sizeof(unsigned)*8-1); + Alignment |= 1U << (sizeof(unsigned)*CHAR_BIT-1); } + /// isMachineConstantPoolEntry - Return true if the MachineConstantPoolEntry + /// is indeed a target specific constantpool entry, not a wrapper over a + /// Constant. bool isMachineConstantPoolEntry() const { - return (int)Offset < 0; + return (int)Alignment < 0; } - int getOffset() const { - return Offset & ~(1 << (sizeof(unsigned)*8-1)); + int getAlignment() const { + return Alignment & ~(1 << (sizeof(unsigned)*CHAR_BIT-1)); } - const Type *getType() const; + Type *getType() const; + + /// getRelocationInfo - This method classifies the entry according to + /// whether or not it may generate a relocation entry. This must be + /// conservative, so if it might codegen to a relocatable entry, it should say + /// so. The return values are: + /// + /// 0: This constant pool entry is guaranteed to never have a relocation + /// applied to it (because it holds a simple constant like '4'). + /// 1: This entry has relocations, but the entries are guaranteed to be + /// resolvable by the static linker, so the dynamic linker will never see + /// them. + /// 2: This entry may have arbitrary relocations. + unsigned getRelocationInfo() const; }; /// The MachineConstantPool class keeps track of constants referenced by a @@ -106,21 +132,25 @@ struct MachineConstantPoolEntry { /// address of the function constant pool values. /// @brief The machine constant pool. class MachineConstantPool { - const TargetData *TD; ///< The machine's TargetData. + const DataLayout *TD; ///< The machine's DataLayout. unsigned PoolAlignment; ///< The alignment for the pool. std::vector Constants; ///< The pool of constants. + /// MachineConstantPoolValues that use an existing MachineConstantPoolEntry. + DenseSet MachineCPVsSharingEntries; public: /// @brief The only constructor. - MachineConstantPool(const TargetData *td) : TD(td), PoolAlignment(1) {} + explicit MachineConstantPool(const DataLayout *td) + : TD(td), PoolAlignment(1) {} ~MachineConstantPool(); - /// getConstantPoolAlignment - Return the log2 of the alignment required by + /// getConstantPoolAlignment - Return 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); + /// an existing one. User must specify the minimum required alignment for + /// the object. + unsigned getConstantPoolIndex(const Constant *C, unsigned Alignment); unsigned getConstantPoolIndex(MachineConstantPoolValue *V,unsigned Alignment); /// isEmpty - Return true if this constant pool contains no constants. @@ -133,10 +163,9 @@ public: /// print - Used by the MachineFunction printer to print information about /// constant pool objects. Implemented in MachineFunction.cpp /// - void print(std::ostream &OS) const; + void print(raw_ostream &OS) const; - /// dump - Call print(std::cerr) to be called from the debugger. - /// + /// dump - Call print(cerr) to be called from the debugger. void dump() const; };