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ce22ec1251
ConvertExpressionToType * Make ValueHandle's remove instruction from maps when they are deleted so that no false map hits occur if a subsequent instruction is allocated to the same space in memory. This was a VERY VERY VERY EVIL NASTY BUG to track down. :-P git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1288 91177308-0d34-0410-b5e6-96231b3b80d8
135 lines
4.8 KiB
C++
135 lines
4.8 KiB
C++
//===-- TransformInternals.h - Shared functions for Transforms ---*- C++ -*--=//
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//
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// This header file declares shared functions used by the different components
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// of the Transforms library.
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//
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//===----------------------------------------------------------------------===//
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#ifndef TRANSFORM_INTERNALS_H
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#define TRANSFORM_INTERNALS_H
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#include "llvm/BasicBlock.h"
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#include "llvm/Instruction.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/DerivedTypes.h"
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#include <map>
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#include <set>
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// TargetData Hack: Eventually we will have annotations given to us by the
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// backend so that we know stuff about type size and alignments. For now
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// though, just use this, because it happens to match the model that GCC uses.
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//
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// FIXME: This should use annotations
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//
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extern const TargetData TD;
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// losslessCastableTypes - Return true if the types are bitwise equivalent.
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// This predicate returns true if it is possible to cast from one type to
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// another without gaining or losing precision, or altering the bits in any way.
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//
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bool losslessCastableTypes(const Type *T1, const Type *T2);
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// isFirstClassType - Return true if a value of the specified type can be held
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// in a register.
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//
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static inline bool isFirstClassType(const Type *Ty) {
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return Ty->isPrimitiveType() || Ty->isPointerType();
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}
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// getPointedToStruct - If the argument is a pointer type, and the pointed to
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// value is a struct type, return the struct type, else return null.
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//
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static inline const StructType *getPointedToStruct(const Type *Ty) {
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const PointerType *PT = dyn_cast<PointerType>(Ty);
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return PT ? dyn_cast<StructType>(PT->getValueType()) : 0;
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}
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// ReplaceInstWithValue - Replace all uses of an instruction (specified by BI)
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// with a value, then remove and delete the original instruction.
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//
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void ReplaceInstWithValue(BasicBlock::InstListType &BIL,
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BasicBlock::iterator &BI, Value *V);
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// ReplaceInstWithInst - Replace the instruction specified by BI with the
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// instruction specified by I. The original instruction is deleted and BI is
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// updated to point to the new instruction.
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//
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void ReplaceInstWithInst(BasicBlock::InstListType &BIL,
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BasicBlock::iterator &BI, Instruction *I);
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// ------------- Expression Conversion ---------------------
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typedef map<const Value*, const Type*> ValueTypeCache;
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struct ValueMapCache {
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// Operands mapped - Contains an entry if the first value (the user) has had
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// the second value (the operand) mapped already.
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//
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set<const User*> OperandsMapped;
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// Expression Map - Contains an entry from the old value to the new value of
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// an expression that has been converted over.
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//
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map<const Value *, Value *> ExprMap;
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typedef map<const Value *, Value *> ExprMapTy;
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};
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bool ExpressionConvertableToType(Value *V, const Type *Ty, ValueTypeCache &Map);
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Value *ConvertExpressionToType(Value *V, const Type *Ty, ValueMapCache &VMC);
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// RetValConvertableToType - Return true if it is possible
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bool RetValConvertableToType(Value *V, const Type *Ty,
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ValueTypeCache &ConvertedTypes);
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void ConvertUsersType(Value *V, Value *NewVal, ValueMapCache &VMC);
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//===----------------------------------------------------------------------===//
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// ValueHandle Class - Smart pointer that occupies a slot on the users USE list
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// that prevents it from being destroyed. This "looks" like an Instruction
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// with Opcode UserOp1.
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//
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class ValueHandle : public Instruction {
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ValueHandle(const ValueHandle &); // DO NOT IMPLEMENT
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ValueMapCache &Cache;
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public:
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ValueHandle(ValueMapCache &VMC, Value *V);
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~ValueHandle();
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virtual Instruction *clone() const { abort(); return 0; }
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virtual const char *getOpcodeName() const {
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return "ValueHandle";
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}
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ValueHandle *) { return true; }
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static inline bool classof(const Instruction *I) {
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return (I->getOpcode() == Instruction::UserOp1);
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}
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static inline bool classof(const Value *V) {
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return isa<Instruction>(V) && classof(cast<Instruction>(V));
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}
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};
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// getStructOffsetType - Return a vector of offsets that are to be used to index
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// into the specified struct type to get as close as possible to index as we
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// can. Note that it is possible that we cannot get exactly to Offset, in which
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// case we update offset to be the offset we actually obtained. The resultant
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// leaf type is returned.
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//
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// If StopEarly is set to true (the default), the first object with the
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// specified type is returned, even if it is a struct type itself. In this
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// case, this routine will not drill down to the leaf type. Set StopEarly to
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// false if you want a leaf
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//
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const Type *getStructOffsetType(const Type *Ty, unsigned &Offset,
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vector<ConstPoolVal*> &Offsets,
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bool StopEarly = true);
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#endif
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