#ifndef LLVM_ANALYSIS_VALUETRACKING_H
#define LLVM_ANALYSIS_VALUETRACKING_H
+#include "llvm/System/DataTypes.h"
#include <string>
-#include <llvm/Support/DataTypes.h>
namespace llvm {
+ template <typename T> class SmallVectorImpl;
class Value;
class Instruction;
class APInt;
/// known to be either zero or one and return them in the KnownZero/KnownOne
/// bit sets. This code only analyzes bits in Mask, in order to short-circuit
/// processing.
+ ///
+ /// This function is defined on values with integer type, values with pointer
+ /// type (but only if TD is non-null), and vectors of integers. In the case
+ /// where V is a vector, the mask, known zero, and known one values are the
+ /// same width as the vector element, and the bit is set only if it is true
+ /// for all of the elements in the vector.
void ComputeMaskedBits(Value *V, const APInt &Mask, APInt &KnownZero,
- APInt &KnownOne, TargetData *TD = 0,
+ APInt &KnownOne, const TargetData *TD = 0,
unsigned Depth = 0);
/// MaskedValueIsZero - Return true if 'V & Mask' is known to be zero. We use
/// this predicate to simplify operations downstream. Mask is known to be
/// zero for bits that V cannot have.
+ ///
+ /// This function is defined on values with integer type, values with pointer
+ /// type (but only if TD is non-null), and vectors of integers. In the case
+ /// where V is a vector, the mask, known zero, and known one values are the
+ /// same width as the vector element, and the bit is set only if it is true
+ /// for all of the elements in the vector.
bool MaskedValueIsZero(Value *V, const APInt &Mask,
- TargetData *TD = 0, unsigned Depth = 0);
+ const TargetData *TD = 0, unsigned Depth = 0);
/// ComputeNumSignBits - Return the number of times the sign bit of the
///
/// 'Op' must have a scalar integer type.
///
- unsigned ComputeNumSignBits(Value *Op, TargetData *TD = 0,
+ unsigned ComputeNumSignBits(Value *Op, const TargetData *TD = 0,
unsigned Depth = 0);
+ /// ComputeMultiple - This function computes the integer multiple of Base that
+ /// equals V. If successful, it returns true and returns the multiple in
+ /// Multiple. If unsuccessful, it returns false. Also, if V can be
+ /// simplified to an integer, then the simplified V is returned in Val. Look
+ /// through sext only if LookThroughSExt=true.
+ bool ComputeMultiple(Value *V, unsigned Base, Value *&Multiple,
+ bool LookThroughSExt = false,
+ unsigned Depth = 0);
+
/// CannotBeNegativeZero - Return true if we can prove that the specified FP
/// value is never equal to -0.0.
///
bool CannotBeNegativeZero(const Value *V, unsigned Depth = 0);
- /// FindScalarValue - Given an aggregrate and an sequence of indices, see if
+
+ /// FindInsertedValue - Given an aggregrate and an sequence of indices, see if
/// the scalar value indexed is already around as a register, for example if
/// it were inserted directly into the aggregrate.
///
/// If InsertBefore is not null, this function will duplicate (modified)
/// insertvalues when a part of a nested struct is extracted.
Value *FindInsertedValue(Value *V,
- const unsigned *idx_begin,
- const unsigned *idx_end,
- Instruction *InsertBefore = 0);
+ const unsigned *idx_begin,
+ const unsigned *idx_end,
+ Instruction *InsertBefore = 0);
/// This is a convenience wrapper for finding values indexed by a single index
/// only.
inline Value *FindInsertedValue(Value *V, const unsigned Idx,
- Instruction *InsertBefore = 0) {
+ Instruction *InsertBefore = 0) {
const unsigned Idxs[1] = { Idx };
return FindInsertedValue(V, &Idxs[0], &Idxs[1], InsertBefore);
- }
+ }
+
+ /// GetConstantStringInfo - This function computes the length of a
+ /// null-terminated C string pointed to by V. If successful, it returns true
+ /// and returns the string in Str. If unsuccessful, it returns false. If
+ /// StopAtNul is set to true (the default), the returned string is truncated
+ /// by a nul character in the global. If StopAtNul is false, the nul
+ /// character is included in the result string.
+ bool GetConstantStringInfo(const Value *V, std::string &Str,
+ uint64_t Offset = 0,
+ bool StopAtNul = true);
+
+ /// GetStringLength - If we can compute the length of the string pointed to by
+ /// the specified pointer, return 'len+1'. If we can't, return 0.
+ uint64_t GetStringLength(Value *V);
} // end namespace llvm
#endif