//
//===----------------------------------------------------------------------===//
//
-/// @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.
//
//===----------------------------------------------------------------------===//
#define LLVM_CODEGEN_MACHINECONSTANTPOOL_H
#include <cassert>
+#include <climits>
#include <vector>
namespace llvm {
/// getType - get type of this MachineConstantPoolValue.
///
- inline const Type *getType() const { return Ty; }
+ const 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;
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 MachineConstantPoolValue.
+ unsigned Alignment;
- MachineConstantPoolEntry(Constant *V, unsigned O)
- : Offset(O) {
- assert((int)Offset >= 0 && "Offset is too large");
+ MachineConstantPoolEntry(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);
}
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;
+
+ /// 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
: TD(td), PoolAlignment(1) {}
~MachineConstantPool();
- /// getConstantPoolAlignment - Return the log2 of the alignment required by
+ /// getConstantPoolAlignment - Return the 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 the log2 of the minimum required
- /// alignment for the object.
+ /// an existing one. User must specify the minimum required alignment for
+ /// the object.
unsigned getConstantPoolIndex(Constant *C, unsigned Alignment);
unsigned getConstantPoolIndex(MachineConstantPoolValue *V,unsigned Alignment);