//
// 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.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_MACHINECONSTANTPOOL_H
#define LLVM_CODEGEN_MACHINECONSTANTPOOL_H
-#include "llvm/ADT/FoldingSet.h"
-#include "llvm/CodeGen/SelectionDAGNodes.h"
-#include "llvm/Support/Streams.h"
+#include "llvm/ADT/DenseSet.h"
+#include "llvm/MC/SectionKind.h"
+#include <cassert>
+#include <climits>
#include <vector>
-#include <iosfwd>
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:
- explicit 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; }
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;
- void print(std::ostream *O) const { if (O) print(*O); }
+ /// 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;
}
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");
- Val.MachineCPVal = V;
- Offset |= 1 << (sizeof(unsigned)*8-1);
+ MachineConstantPoolEntry(MachineConstantPoolValue *V, unsigned A)
+ : Alignment(A) {
+ Val.MachineCPVal = V;
+ 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;
+
+ /// 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.
+ bool needsRelocation() const;
+
+ SectionKind getSectionKind(const DataLayout *DL) const;
};
-
+
/// 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
/// 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.
+ unsigned PoolAlignment; ///< The alignment for the pool.
std::vector<MachineConstantPoolEntry> Constants; ///< The pool of constants.
+ /// MachineConstantPoolValues that use an existing MachineConstantPoolEntry.
+ DenseSet<MachineConstantPoolValue*> MachineCPVsSharingEntries;
+ const DataLayout &DL;
+
+ const DataLayout &getDataLayout() const { return DL; }
+
public:
/// @brief The only constructor.
- MachineConstantPool(const TargetData *td) : TD(td), PoolAlignment(1) {}
+ explicit MachineConstantPool(const DataLayout &DL)
+ : PoolAlignment(1), DL(DL) {}
~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);
- unsigned getConstantPoolIndex(MachineConstantPoolValue *V,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.
bool isEmpty() const { return Constants.empty(); }
/// 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(std::ostream *OS) const { if (OS) print(*OS); }
+ 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;
};
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