mirror of
https://github.com/c64scene-ar/llvm-6502.git
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b3abf9d0d8
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2714 91177308-0d34-0410-b5e6-96231b3b80d8
1216 lines
45 KiB
C++
1216 lines
45 KiB
C++
//===- ExprTypeConvert.cpp - Code to change an LLVM Expr Type ---------------=//
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//
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// This file implements the part of level raising that checks to see if it is
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// possible to coerce an entire expression tree into a different type. If
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// convertable, other routines from this file will do the conversion.
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//
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//===----------------------------------------------------------------------===//
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#include "TransformInternals.h"
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#include "llvm/iOther.h"
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#include "llvm/iPHINode.h"
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#include "llvm/iMemory.h"
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#include "llvm/ConstantHandling.h"
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#include "llvm/Analysis/Expressions.h"
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#include "Support/STLExtras.h"
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#include "Support/StatisticReporter.h"
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#include <algorithm>
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#include <iostream>
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using std::cerr;
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static bool OperandConvertableToType(User *U, Value *V, const Type *Ty,
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ValueTypeCache &ConvertedTypes);
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static void ConvertOperandToType(User *U, Value *OldVal, Value *NewVal,
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ValueMapCache &VMC);
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// AllIndicesZero - Return true if all of the indices of the specified memory
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// access instruction are zero, indicating an effectively nil offset to the
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// pointer value.
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//
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static bool AllIndicesZero(const MemAccessInst *MAI) {
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for (User::const_op_iterator S = MAI->idx_begin(), E = MAI->idx_end();
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S != E; ++S)
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if (!isa<Constant>(*S) || !cast<Constant>(*S)->isNullValue())
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return false;
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return true;
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}
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// Peephole Malloc instructions: we take a look at the use chain of the
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// malloc instruction, and try to find out if the following conditions hold:
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// 1. The malloc is of the form: 'malloc [sbyte], uint <constant>'
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// 2. The only users of the malloc are cast & add instructions
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// 3. Of the cast instructions, there is only one destination pointer type
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// [RTy] where the size of the pointed to object is equal to the number
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// of bytes allocated.
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//
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// If these conditions hold, we convert the malloc to allocate an [RTy]
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// element. TODO: This comment is out of date WRT arrays
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//
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static bool MallocConvertableToType(MallocInst *MI, const Type *Ty,
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ValueTypeCache &CTMap) {
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if (!isa<PointerType>(Ty)) return false; // Malloc always returns pointers
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// Deal with the type to allocate, not the pointer type...
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Ty = cast<PointerType>(Ty)->getElementType();
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if (!Ty->isSized()) return false; // Can only alloc something with a size
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// Analyze the number of bytes allocated...
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analysis::ExprType Expr = analysis::ClassifyExpression(MI->getArraySize());
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// Get information about the base datatype being allocated, before & after
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int ReqTypeSize = TD.getTypeSize(Ty);
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unsigned OldTypeSize = TD.getTypeSize(MI->getType()->getElementType());
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// Must have a scale or offset to analyze it...
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if (!Expr.Offset && !Expr.Scale && OldTypeSize == 1) return false;
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// Get the offset and scale of the allocation...
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int OffsetVal = Expr.Offset ? getConstantValue(Expr.Offset) : 0;
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int ScaleVal = Expr.Scale ? getConstantValue(Expr.Scale) : (Expr.Var ? 1 : 0);
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// The old type might not be of unit size, take old size into consideration
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// here...
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int Offset = OffsetVal * OldTypeSize;
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int Scale = ScaleVal * OldTypeSize;
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// In order to be successful, both the scale and the offset must be a multiple
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// of the requested data type's size.
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//
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if (Offset/ReqTypeSize*ReqTypeSize != Offset ||
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Scale/ReqTypeSize*ReqTypeSize != Scale)
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return false; // Nope.
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return true;
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}
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static Instruction *ConvertMallocToType(MallocInst *MI, const Type *Ty,
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const std::string &Name,
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ValueMapCache &VMC){
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BasicBlock *BB = MI->getParent();
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BasicBlock::iterator It = BB->end();
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// Analyze the number of bytes allocated...
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analysis::ExprType Expr = analysis::ClassifyExpression(MI->getArraySize());
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const PointerType *AllocTy = cast<PointerType>(Ty);
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const Type *ElType = AllocTy->getElementType();
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unsigned DataSize = TD.getTypeSize(ElType);
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unsigned OldTypeSize = TD.getTypeSize(MI->getType()->getElementType());
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// Get the offset and scale coefficients that we are allocating...
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int OffsetVal = (Expr.Offset ? getConstantValue(Expr.Offset) : 0);
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int ScaleVal = Expr.Scale ? getConstantValue(Expr.Scale) : (Expr.Var ? 1 : 0);
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// The old type might not be of unit size, take old size into consideration
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// here...
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unsigned Offset = (unsigned)OffsetVal * OldTypeSize / DataSize;
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unsigned Scale = (unsigned)ScaleVal * OldTypeSize / DataSize;
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// Locate the malloc instruction, because we may be inserting instructions
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It = find(BB->getInstList().begin(), BB->getInstList().end(), MI);
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// If we have a scale, apply it first...
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if (Expr.Var) {
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// Expr.Var is not neccesarily unsigned right now, insert a cast now.
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if (Expr.Var->getType() != Type::UIntTy) {
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Instruction *CI = new CastInst(Expr.Var, Type::UIntTy);
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if (Expr.Var->hasName()) CI->setName(Expr.Var->getName()+"-uint");
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It = BB->getInstList().insert(It, CI)+1;
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Expr.Var = CI;
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}
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if (Scale != 1) {
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Instruction *ScI =
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BinaryOperator::create(Instruction::Mul, Expr.Var,
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ConstantUInt::get(Type::UIntTy, Scale));
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if (Expr.Var->hasName()) ScI->setName(Expr.Var->getName()+"-scl");
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It = BB->getInstList().insert(It, ScI)+1;
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Expr.Var = ScI;
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}
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} else {
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// If we are not scaling anything, just make the offset be the "var"...
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Expr.Var = ConstantUInt::get(Type::UIntTy, Offset);
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Offset = 0; Scale = 1;
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}
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// If we have an offset now, add it in...
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if (Offset != 0) {
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assert(Expr.Var && "Var must be nonnull by now!");
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Instruction *AddI =
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BinaryOperator::create(Instruction::Add, Expr.Var,
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ConstantUInt::get(Type::UIntTy, Offset));
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if (Expr.Var->hasName()) AddI->setName(Expr.Var->getName()+"-off");
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It = BB->getInstList().insert(It, AddI)+1;
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Expr.Var = AddI;
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}
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Instruction *NewI = new MallocInst(AllocTy, Expr.Var, Name);
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assert(AllocTy == Ty);
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return NewI;
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}
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// ExpressionConvertableToType - Return true if it is possible
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bool ExpressionConvertableToType(Value *V, const Type *Ty,
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ValueTypeCache &CTMap) {
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if (V->getType() == Ty) return true; // Expression already correct type!
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// Expression type must be holdable in a register.
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if (!Ty->isFirstClassType())
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return false;
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ValueTypeCache::iterator CTMI = CTMap.find(V);
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if (CTMI != CTMap.end()) return CTMI->second == Ty;
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CTMap[V] = Ty;
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Instruction *I = dyn_cast<Instruction>(V);
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if (I == 0) {
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// It's not an instruction, check to see if it's a constant... all constants
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// can be converted to an equivalent value (except pointers, they can't be
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// const prop'd in general). We just ask the constant propogator to see if
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// it can convert the value...
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//
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if (Constant *CPV = dyn_cast<Constant>(V))
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if (ConstantFoldCastInstruction(CPV, Ty))
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return true; // Don't worry about deallocating, it's a constant.
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return false; // Otherwise, we can't convert!
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}
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switch (I->getOpcode()) {
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case Instruction::Cast:
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// We can convert the expr if the cast destination type is losslessly
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// convertable to the requested type.
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if (!Ty->isLosslesslyConvertableTo(I->getType())) return false;
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// We also do not allow conversion of a cast that casts from a ptr to array
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// of X to a *X. For example: cast [4 x %List *] * %val to %List * *
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//
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if (PointerType *SPT = dyn_cast<PointerType>(I->getOperand(0)->getType()))
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if (PointerType *DPT = dyn_cast<PointerType>(I->getType()))
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if (ArrayType *AT = dyn_cast<ArrayType>(SPT->getElementType()))
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if (AT->getElementType() == DPT->getElementType())
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return false;
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break;
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case Instruction::Add:
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case Instruction::Sub:
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if (!ExpressionConvertableToType(I->getOperand(0), Ty, CTMap) ||
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!ExpressionConvertableToType(I->getOperand(1), Ty, CTMap))
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return false;
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break;
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case Instruction::Shr:
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if (Ty->isSigned() != V->getType()->isSigned()) return false;
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// FALL THROUGH
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case Instruction::Shl:
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if (!ExpressionConvertableToType(I->getOperand(0), Ty, CTMap))
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return false;
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break;
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case Instruction::Load: {
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LoadInst *LI = cast<LoadInst>(I);
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if (LI->hasIndices() && !AllIndicesZero(LI)) {
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// We can't convert a load expression if it has indices... unless they are
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// all zero.
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return false;
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}
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if (!ExpressionConvertableToType(LI->getPointerOperand(),
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PointerType::get(Ty), CTMap))
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return false;
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break;
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}
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case Instruction::PHINode: {
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PHINode *PN = cast<PHINode>(I);
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for (unsigned i = 0; i < PN->getNumIncomingValues(); ++i)
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if (!ExpressionConvertableToType(PN->getIncomingValue(i), Ty, CTMap))
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return false;
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break;
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}
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case Instruction::Malloc:
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if (!MallocConvertableToType(cast<MallocInst>(I), Ty, CTMap))
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return false;
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break;
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case Instruction::GetElementPtr: {
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// GetElementPtr's are directly convertable to a pointer type if they have
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// a number of zeros at the end. Because removing these values does not
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// change the logical offset of the GEP, it is okay and fair to remove them.
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// This can change this:
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// %t1 = getelementptr %Hosp * %hosp, ubyte 4, ubyte 0 ; <%List **>
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// %t2 = cast %List * * %t1 to %List *
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// into
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// %t2 = getelementptr %Hosp * %hosp, ubyte 4 ; <%List *>
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//
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GetElementPtrInst *GEP = cast<GetElementPtrInst>(I);
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const PointerType *PTy = dyn_cast<PointerType>(Ty);
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if (!PTy) return false; // GEP must always return a pointer...
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const Type *PVTy = PTy->getElementType();
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// Check to see if there are zero elements that we can remove from the
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// index array. If there are, check to see if removing them causes us to
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// get to the right type...
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//
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std::vector<Value*> Indices = GEP->copyIndices();
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const Type *BaseType = GEP->getPointerOperand()->getType();
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const Type *ElTy = 0;
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while (!Indices.empty() && isa<ConstantUInt>(Indices.back()) &&
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cast<ConstantUInt>(Indices.back())->getValue() == 0) {
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Indices.pop_back();
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ElTy = GetElementPtrInst::getIndexedType(BaseType, Indices, true);
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if (ElTy == PVTy)
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break; // Found a match!!
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ElTy = 0;
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}
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if (ElTy) break; // Found a number of zeros we can strip off!
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// Otherwise, we can convert a GEP from one form to the other iff the
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// current gep is of the form 'getelementptr sbyte*, unsigned N
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// and we could convert this to an appropriate GEP for the new type.
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//
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if (GEP->getNumOperands() == 2 &&
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GEP->getOperand(1)->getType() == Type::UIntTy &&
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GEP->getType() == PointerType::get(Type::SByteTy)) {
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// Do not Check to see if our incoming pointer can be converted
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// to be a ptr to an array of the right type... because in more cases than
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// not, it is simply not analyzable because of pointer/array
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// discrepencies. To fix this, we will insert a cast before the GEP.
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//
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// Check to see if 'N' is an expression that can be converted to
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// the appropriate size... if so, allow it.
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//
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std::vector<Value*> Indices;
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const Type *ElTy = ConvertableToGEP(PTy, I->getOperand(1), Indices);
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if (ElTy == PVTy) {
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if (!ExpressionConvertableToType(I->getOperand(0),
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PointerType::get(ElTy), CTMap))
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return false; // Can't continue, ExConToTy might have polluted set!
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break;
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}
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}
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// Otherwise, it could be that we have something like this:
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// getelementptr [[sbyte] *] * %reg115, uint %reg138 ; [sbyte]**
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// and want to convert it into something like this:
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// getelemenptr [[int] *] * %reg115, uint %reg138 ; [int]**
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//
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if (GEP->getNumOperands() == 2 &&
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GEP->getOperand(1)->getType() == Type::UIntTy &&
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TD.getTypeSize(PTy->getElementType()) ==
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TD.getTypeSize(GEP->getType()->getElementType())) {
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const PointerType *NewSrcTy = PointerType::get(PVTy);
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if (!ExpressionConvertableToType(I->getOperand(0), NewSrcTy, CTMap))
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return false;
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break;
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}
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return false; // No match, maybe next time.
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}
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default:
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return false;
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}
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// Expressions are only convertable if all of the users of the expression can
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// have this value converted. This makes use of the map to avoid infinite
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// recursion.
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//
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for (Value::use_iterator It = I->use_begin(), E = I->use_end(); It != E; ++It)
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if (!OperandConvertableToType(*It, I, Ty, CTMap))
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return false;
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return true;
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}
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Value *ConvertExpressionToType(Value *V, const Type *Ty, ValueMapCache &VMC) {
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if (V->getType() == Ty) return V; // Already where we need to be?
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ValueMapCache::ExprMapTy::iterator VMCI = VMC.ExprMap.find(V);
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if (VMCI != VMC.ExprMap.end()) {
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assert(VMCI->second->getType() == Ty);
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if (Instruction *I = dyn_cast<Instruction>(V))
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ValueHandle IHandle(VMC, I); // Remove I if it is unused now!
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return VMCI->second;
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}
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DEBUG(cerr << "CETT: " << (void*)V << " " << V);
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Instruction *I = dyn_cast<Instruction>(V);
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if (I == 0)
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if (Constant *CPV = cast<Constant>(V)) {
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// Constants are converted by constant folding the cast that is required.
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// We assume here that all casts are implemented for constant prop.
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Value *Result = ConstantFoldCastInstruction(CPV, Ty);
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assert(Result && "ConstantFoldCastInstruction Failed!!!");
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assert(Result->getType() == Ty && "Const prop of cast failed!");
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// Add the instruction to the expression map
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VMC.ExprMap[V] = Result;
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return Result;
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}
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BasicBlock *BB = I->getParent();
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BasicBlock::InstListType &BIL = BB->getInstList();
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std::string Name = I->getName(); if (!Name.empty()) I->setName("");
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Instruction *Res; // Result of conversion
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ValueHandle IHandle(VMC, I); // Prevent I from being removed!
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Constant *Dummy = Constant::getNullValue(Ty);
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switch (I->getOpcode()) {
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case Instruction::Cast:
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Res = new CastInst(I->getOperand(0), Ty, Name);
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break;
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case Instruction::Add:
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case Instruction::Sub:
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Res = BinaryOperator::create(cast<BinaryOperator>(I)->getOpcode(),
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Dummy, Dummy, Name);
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VMC.ExprMap[I] = Res; // Add node to expression eagerly
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Res->setOperand(0, ConvertExpressionToType(I->getOperand(0), Ty, VMC));
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Res->setOperand(1, ConvertExpressionToType(I->getOperand(1), Ty, VMC));
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break;
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case Instruction::Shl:
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case Instruction::Shr:
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Res = new ShiftInst(cast<ShiftInst>(I)->getOpcode(), Dummy,
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I->getOperand(1), Name);
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VMC.ExprMap[I] = Res;
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Res->setOperand(0, ConvertExpressionToType(I->getOperand(0), Ty, VMC));
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break;
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case Instruction::Load: {
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LoadInst *LI = cast<LoadInst>(I);
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assert(!LI->hasIndices() || AllIndicesZero(LI));
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Res = new LoadInst(Constant::getNullValue(PointerType::get(Ty)), Name);
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VMC.ExprMap[I] = Res;
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Res->setOperand(0, ConvertExpressionToType(LI->getPointerOperand(),
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PointerType::get(Ty), VMC));
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assert(Res->getOperand(0)->getType() == PointerType::get(Ty));
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assert(Ty == Res->getType());
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assert(Res->getType()->isFirstClassType() && "Load of structure or array!");
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break;
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}
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case Instruction::PHINode: {
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PHINode *OldPN = cast<PHINode>(I);
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PHINode *NewPN = new PHINode(Ty, Name);
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VMC.ExprMap[I] = NewPN; // Add node to expression eagerly
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while (OldPN->getNumOperands()) {
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BasicBlock *BB = OldPN->getIncomingBlock(0);
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Value *OldVal = OldPN->getIncomingValue(0);
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ValueHandle OldValHandle(VMC, OldVal);
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OldPN->removeIncomingValue(BB);
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Value *V = ConvertExpressionToType(OldVal, Ty, VMC);
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NewPN->addIncoming(V, BB);
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}
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Res = NewPN;
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break;
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}
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case Instruction::Malloc: {
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Res = ConvertMallocToType(cast<MallocInst>(I), Ty, Name, VMC);
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break;
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}
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case Instruction::GetElementPtr: {
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// GetElementPtr's are directly convertable to a pointer type if they have
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// a number of zeros at the end. Because removing these values does not
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// change the logical offset of the GEP, it is okay and fair to remove them.
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|
// This can change this:
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// %t1 = getelementptr %Hosp * %hosp, ubyte 4, ubyte 0 ; <%List **>
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// %t2 = cast %List * * %t1 to %List *
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// into
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// %t2 = getelementptr %Hosp * %hosp, ubyte 4 ; <%List *>
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//
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GetElementPtrInst *GEP = cast<GetElementPtrInst>(I);
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// Check to see if there are zero elements that we can remove from the
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// index array. If there are, check to see if removing them causes us to
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// get to the right type...
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//
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std::vector<Value*> Indices = GEP->copyIndices();
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const Type *BaseType = GEP->getPointerOperand()->getType();
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const Type *PVTy = cast<PointerType>(Ty)->getElementType();
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Res = 0;
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while (!Indices.empty() && isa<ConstantUInt>(Indices.back()) &&
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cast<ConstantUInt>(Indices.back())->getValue() == 0) {
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Indices.pop_back();
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if (GetElementPtrInst::getIndexedType(BaseType, Indices, true) == PVTy) {
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if (Indices.size() == 0) {
|
|
Res = new CastInst(GEP->getPointerOperand(), BaseType); // NOOP
|
|
} else {
|
|
Res = new GetElementPtrInst(GEP->getPointerOperand(), Indices, Name);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (Res == 0 && GEP->getNumOperands() == 2 &&
|
|
GEP->getOperand(1)->getType() == Type::UIntTy &&
|
|
GEP->getType() == PointerType::get(Type::SByteTy)) {
|
|
|
|
// Otherwise, we can convert a GEP from one form to the other iff the
|
|
// current gep is of the form 'getelementptr [sbyte]*, unsigned N
|
|
// and we could convert this to an appropriate GEP for the new type.
|
|
//
|
|
const PointerType *NewSrcTy = PointerType::get(PVTy);
|
|
BasicBlock::iterator It = find(BIL.begin(), BIL.end(), I);
|
|
|
|
// Check to see if 'N' is an expression that can be converted to
|
|
// the appropriate size... if so, allow it.
|
|
//
|
|
std::vector<Value*> Indices;
|
|
const Type *ElTy = ConvertableToGEP(NewSrcTy, I->getOperand(1),
|
|
Indices, &It);
|
|
if (ElTy) {
|
|
assert(ElTy == PVTy && "Internal error, setup wrong!");
|
|
Res = new GetElementPtrInst(Constant::getNullValue(NewSrcTy),
|
|
Indices, Name);
|
|
VMC.ExprMap[I] = Res;
|
|
Res->setOperand(0, ConvertExpressionToType(I->getOperand(0),
|
|
NewSrcTy, VMC));
|
|
}
|
|
}
|
|
|
|
// Otherwise, it could be that we have something like this:
|
|
// getelementptr [[sbyte] *] * %reg115, uint %reg138 ; [sbyte]**
|
|
// and want to convert it into something like this:
|
|
// getelemenptr [[int] *] * %reg115, uint %reg138 ; [int]**
|
|
//
|
|
if (Res == 0) {
|
|
const PointerType *NewSrcTy = PointerType::get(PVTy);
|
|
Res = new GetElementPtrInst(Constant::getNullValue(NewSrcTy),
|
|
GEP->copyIndices(), Name);
|
|
VMC.ExprMap[I] = Res;
|
|
Res->setOperand(0, ConvertExpressionToType(I->getOperand(0),
|
|
NewSrcTy, VMC));
|
|
}
|
|
|
|
|
|
assert(Res && "Didn't find match!");
|
|
break; // No match, maybe next time.
|
|
}
|
|
|
|
default:
|
|
assert(0 && "Expression convertable, but don't know how to convert?");
|
|
return 0;
|
|
}
|
|
|
|
assert(Res->getType() == Ty && "Didn't convert expr to correct type!");
|
|
|
|
BasicBlock::iterator It = find(BIL.begin(), BIL.end(), I);
|
|
assert(It != BIL.end() && "Instruction not in own basic block??");
|
|
BIL.insert(It, Res);
|
|
|
|
// Add the instruction to the expression map
|
|
VMC.ExprMap[I] = Res;
|
|
|
|
// Expressions are only convertable if all of the users of the expression can
|
|
// have this value converted. This makes use of the map to avoid infinite
|
|
// recursion.
|
|
//
|
|
unsigned NumUses = I->use_size();
|
|
for (unsigned It = 0; It < NumUses; ) {
|
|
unsigned OldSize = NumUses;
|
|
ConvertOperandToType(*(I->use_begin()+It), I, Res, VMC);
|
|
NumUses = I->use_size();
|
|
if (NumUses == OldSize) ++It;
|
|
}
|
|
|
|
DEBUG(cerr << "ExpIn: " << (void*)I << " " << I
|
|
<< "ExpOut: " << (void*)Res << " " << Res);
|
|
|
|
if (I->use_empty()) {
|
|
DEBUG(cerr << "EXPR DELETING: " << (void*)I << " " << I);
|
|
BIL.remove(I);
|
|
VMC.OperandsMapped.erase(I);
|
|
VMC.ExprMap.erase(I);
|
|
delete I;
|
|
}
|
|
|
|
return Res;
|
|
}
|
|
|
|
|
|
|
|
// ValueConvertableToType - Return true if it is possible
|
|
bool ValueConvertableToType(Value *V, const Type *Ty,
|
|
ValueTypeCache &ConvertedTypes) {
|
|
ValueTypeCache::iterator I = ConvertedTypes.find(V);
|
|
if (I != ConvertedTypes.end()) return I->second == Ty;
|
|
ConvertedTypes[V] = Ty;
|
|
|
|
// It is safe to convert the specified value to the specified type IFF all of
|
|
// the uses of the value can be converted to accept the new typed value.
|
|
//
|
|
if (V->getType() != Ty) {
|
|
for (Value::use_iterator I = V->use_begin(), E = V->use_end(); I != E; ++I)
|
|
if (!OperandConvertableToType(*I, V, Ty, ConvertedTypes))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
// OperandConvertableToType - Return true if it is possible to convert operand
|
|
// V of User (instruction) U to the specified type. This is true iff it is
|
|
// possible to change the specified instruction to accept this. CTMap is a map
|
|
// of converted types, so that circular definitions will see the future type of
|
|
// the expression, not the static current type.
|
|
//
|
|
static bool OperandConvertableToType(User *U, Value *V, const Type *Ty,
|
|
ValueTypeCache &CTMap) {
|
|
// if (V->getType() == Ty) return true; // Operand already the right type?
|
|
|
|
// Expression type must be holdable in a register.
|
|
if (!Ty->isFirstClassType())
|
|
return false;
|
|
|
|
Instruction *I = dyn_cast<Instruction>(U);
|
|
if (I == 0) return false; // We can't convert!
|
|
|
|
switch (I->getOpcode()) {
|
|
case Instruction::Cast:
|
|
assert(I->getOperand(0) == V);
|
|
// We can convert the expr if the cast destination type is losslessly
|
|
// convertable to the requested type.
|
|
// Also, do not change a cast that is a noop cast. For all intents and
|
|
// purposes it should be eliminated.
|
|
if (!Ty->isLosslesslyConvertableTo(I->getOperand(0)->getType()) ||
|
|
I->getType() == I->getOperand(0)->getType())
|
|
return false;
|
|
|
|
// Do not allow a 'cast ushort %V to uint' to have it's first operand be
|
|
// converted to a 'short' type. Doing so changes the way sign promotion
|
|
// happens, and breaks things. Only allow the cast to take place if the
|
|
// signedness doesn't change... or if the current cast is not a lossy
|
|
// conversion.
|
|
//
|
|
if (!I->getType()->isLosslesslyConvertableTo(I->getOperand(0)->getType()) &&
|
|
I->getOperand(0)->getType()->isSigned() != Ty->isSigned())
|
|
return false;
|
|
|
|
// We also do not allow conversion of a cast that casts from a ptr to array
|
|
// of X to a *X. For example: cast [4 x %List *] * %val to %List * *
|
|
//
|
|
if (PointerType *SPT = dyn_cast<PointerType>(I->getOperand(0)->getType()))
|
|
if (PointerType *DPT = dyn_cast<PointerType>(I->getType()))
|
|
if (ArrayType *AT = dyn_cast<ArrayType>(SPT->getElementType()))
|
|
if (AT->getElementType() == DPT->getElementType())
|
|
return false;
|
|
return true;
|
|
|
|
case Instruction::Add:
|
|
if (isa<PointerType>(Ty)) {
|
|
Value *IndexVal = I->getOperand(V == I->getOperand(0) ? 1 : 0);
|
|
std::vector<Value*> Indices;
|
|
if (const Type *ETy = ConvertableToGEP(Ty, IndexVal, Indices)) {
|
|
const Type *RetTy = PointerType::get(ETy);
|
|
|
|
// Only successful if we can convert this type to the required type
|
|
if (ValueConvertableToType(I, RetTy, CTMap)) {
|
|
CTMap[I] = RetTy;
|
|
return true;
|
|
}
|
|
// We have to return failure here because ValueConvertableToType could
|
|
// have polluted our map
|
|
return false;
|
|
}
|
|
}
|
|
// FALLTHROUGH
|
|
case Instruction::Sub: {
|
|
Value *OtherOp = I->getOperand((V == I->getOperand(0)) ? 1 : 0);
|
|
return ValueConvertableToType(I, Ty, CTMap) &&
|
|
ExpressionConvertableToType(OtherOp, Ty, CTMap);
|
|
}
|
|
case Instruction::SetEQ:
|
|
case Instruction::SetNE: {
|
|
Value *OtherOp = I->getOperand((V == I->getOperand(0)) ? 1 : 0);
|
|
return ExpressionConvertableToType(OtherOp, Ty, CTMap);
|
|
}
|
|
case Instruction::Shr:
|
|
if (Ty->isSigned() != V->getType()->isSigned()) return false;
|
|
// FALL THROUGH
|
|
case Instruction::Shl:
|
|
assert(I->getOperand(0) == V);
|
|
return ValueConvertableToType(I, Ty, CTMap);
|
|
|
|
case Instruction::Free:
|
|
assert(I->getOperand(0) == V);
|
|
return isa<PointerType>(Ty); // Free can free any pointer type!
|
|
|
|
case Instruction::Load:
|
|
// Cannot convert the types of any subscripts...
|
|
if (I->getOperand(0) != V) return false;
|
|
|
|
if (const PointerType *PT = dyn_cast<PointerType>(Ty)) {
|
|
LoadInst *LI = cast<LoadInst>(I);
|
|
|
|
if (LI->hasIndices() && !AllIndicesZero(LI))
|
|
return false;
|
|
|
|
const Type *LoadedTy = PT->getElementType();
|
|
|
|
// They could be loading the first element of a composite type...
|
|
if (const CompositeType *CT = dyn_cast<CompositeType>(LoadedTy)) {
|
|
unsigned Offset = 0; // No offset, get first leaf.
|
|
std::vector<Value*> Indices; // Discarded...
|
|
LoadedTy = getStructOffsetType(CT, Offset, Indices, false);
|
|
assert(Offset == 0 && "Offset changed from zero???");
|
|
}
|
|
|
|
if (!LoadedTy->isFirstClassType())
|
|
return false;
|
|
|
|
if (TD.getTypeSize(LoadedTy) != TD.getTypeSize(LI->getType()))
|
|
return false;
|
|
|
|
return ValueConvertableToType(LI, LoadedTy, CTMap);
|
|
}
|
|
return false;
|
|
|
|
case Instruction::Store: {
|
|
StoreInst *SI = cast<StoreInst>(I);
|
|
if (SI->hasIndices()) return false;
|
|
|
|
if (V == I->getOperand(0)) {
|
|
ValueTypeCache::iterator CTMI = CTMap.find(I->getOperand(1));
|
|
if (CTMI != CTMap.end()) { // Operand #1 is in the table already?
|
|
// If so, check to see if it's Ty*, or, more importantly, if it is a
|
|
// pointer to a structure where the first element is a Ty... this code
|
|
// is neccesary because we might be trying to change the source and
|
|
// destination type of the store (they might be related) and the dest
|
|
// pointer type might be a pointer to structure. Below we allow pointer
|
|
// to structures where the 0th element is compatible with the value,
|
|
// now we have to support the symmetrical part of this.
|
|
//
|
|
const Type *ElTy = cast<PointerType>(CTMI->second)->getElementType();
|
|
|
|
// Already a pointer to what we want? Trivially accept...
|
|
if (ElTy == Ty) return true;
|
|
|
|
// Tricky case now, if the destination is a pointer to structure,
|
|
// obviously the source is not allowed to be a structure (cannot copy
|
|
// a whole structure at a time), so the level raiser must be trying to
|
|
// store into the first field. Check for this and allow it now:
|
|
//
|
|
if (StructType *SElTy = dyn_cast<StructType>(ElTy)) {
|
|
unsigned Offset = 0;
|
|
std::vector<Value*> Indices;
|
|
ElTy = getStructOffsetType(ElTy, Offset, Indices, false);
|
|
assert(Offset == 0 && "Offset changed!");
|
|
if (ElTy == 0) // Element at offset zero in struct doesn't exist!
|
|
return false; // Can only happen for {}*
|
|
|
|
if (ElTy == Ty) // Looks like the 0th element of structure is
|
|
return true; // compatible! Accept now!
|
|
|
|
// Otherwise we know that we can't work, so just stop trying now.
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// Can convert the store if we can convert the pointer operand to match
|
|
// the new value type...
|
|
return ExpressionConvertableToType(I->getOperand(1), PointerType::get(Ty),
|
|
CTMap);
|
|
} else if (const PointerType *PT = dyn_cast<PointerType>(Ty)) {
|
|
const Type *ElTy = PT->getElementType();
|
|
assert(V == I->getOperand(1));
|
|
|
|
if (isa<StructType>(ElTy)) {
|
|
// We can change the destination pointer if we can store our first
|
|
// argument into the first element of the structure...
|
|
//
|
|
unsigned Offset = 0;
|
|
std::vector<Value*> Indices;
|
|
ElTy = getStructOffsetType(ElTy, Offset, Indices, false);
|
|
assert(Offset == 0 && "Offset changed!");
|
|
if (ElTy == 0) // Element at offset zero in struct doesn't exist!
|
|
return false; // Can only happen for {}*
|
|
}
|
|
|
|
// Must move the same amount of data...
|
|
if (TD.getTypeSize(ElTy) != TD.getTypeSize(I->getOperand(0)->getType()))
|
|
return false;
|
|
|
|
// Can convert store if the incoming value is convertable...
|
|
return ExpressionConvertableToType(I->getOperand(0), ElTy, CTMap);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
case Instruction::GetElementPtr:
|
|
if (V != I->getOperand(0) || !isa<PointerType>(Ty)) return false;
|
|
|
|
// If we have a two operand form of getelementptr, this is really little
|
|
// more than a simple addition. As with addition, check to see if the
|
|
// getelementptr instruction can be changed to index into the new type.
|
|
//
|
|
if (I->getNumOperands() == 2) {
|
|
const Type *OldElTy = cast<PointerType>(I->getType())->getElementType();
|
|
unsigned DataSize = TD.getTypeSize(OldElTy);
|
|
Value *Index = I->getOperand(1);
|
|
Instruction *TempScale = 0;
|
|
|
|
// If the old data element is not unit sized, we have to create a scale
|
|
// instruction so that ConvertableToGEP will know the REAL amount we are
|
|
// indexing by. Note that this is never inserted into the instruction
|
|
// stream, so we have to delete it when we're done.
|
|
//
|
|
if (DataSize != 1) {
|
|
TempScale = BinaryOperator::create(Instruction::Mul, Index,
|
|
ConstantUInt::get(Type::UIntTy,
|
|
DataSize));
|
|
Index = TempScale;
|
|
}
|
|
|
|
// Check to see if the second argument is an expression that can
|
|
// be converted to the appropriate size... if so, allow it.
|
|
//
|
|
std::vector<Value*> Indices;
|
|
const Type *ElTy = ConvertableToGEP(Ty, Index, Indices);
|
|
delete TempScale; // Free our temporary multiply if we made it
|
|
|
|
if (ElTy == 0) return false; // Cannot make conversion...
|
|
return ValueConvertableToType(I, PointerType::get(ElTy), CTMap);
|
|
}
|
|
return false;
|
|
|
|
case Instruction::PHINode: {
|
|
PHINode *PN = cast<PHINode>(I);
|
|
for (unsigned i = 0; i < PN->getNumIncomingValues(); ++i)
|
|
if (!ExpressionConvertableToType(PN->getIncomingValue(i), Ty, CTMap))
|
|
return false;
|
|
return ValueConvertableToType(PN, Ty, CTMap);
|
|
}
|
|
|
|
case Instruction::Call: {
|
|
User::op_iterator OI = find(I->op_begin(), I->op_end(), V);
|
|
assert (OI != I->op_end() && "Not using value!");
|
|
unsigned OpNum = OI - I->op_begin();
|
|
|
|
// Are we trying to change the function pointer value to a new type?
|
|
if (OpNum == 0) {
|
|
PointerType *PTy = dyn_cast<PointerType>(Ty);
|
|
if (PTy == 0) return false; // Can't convert to a non-pointer type...
|
|
FunctionType *MTy = dyn_cast<FunctionType>(PTy->getElementType());
|
|
if (MTy == 0) return false; // Can't convert to a non ptr to function...
|
|
|
|
// Perform sanity checks to make sure that new function type has the
|
|
// correct number of arguments...
|
|
//
|
|
unsigned NumArgs = I->getNumOperands()-1; // Don't include function ptr
|
|
|
|
// Cannot convert to a type that requires more fixed arguments than
|
|
// the call provides...
|
|
//
|
|
if (NumArgs < MTy->getParamTypes().size()) return false;
|
|
|
|
// Unless this is a vararg function type, we cannot provide more arguments
|
|
// than are desired...
|
|
//
|
|
if (!MTy->isVarArg() && NumArgs > MTy->getParamTypes().size())
|
|
return false;
|
|
|
|
// Okay, at this point, we know that the call and the function type match
|
|
// number of arguments. Now we see if we can convert the arguments
|
|
// themselves. Note that we do not require operands to be convertable,
|
|
// we can insert casts if they are convertible but not compatible. The
|
|
// reason for this is that we prefer to have resolved functions but casted
|
|
// arguments if possible.
|
|
//
|
|
const FunctionType::ParamTypes &PTs = MTy->getParamTypes();
|
|
for (unsigned i = 0, NA = PTs.size(); i < NA; ++i)
|
|
if (!PTs[i]->isLosslesslyConvertableTo(I->getOperand(i+1)->getType()))
|
|
return false; // Operands must have compatible types!
|
|
|
|
// Okay, at this point, we know that all of the arguments can be
|
|
// converted. We succeed if we can change the return type if
|
|
// neccesary...
|
|
//
|
|
return ValueConvertableToType(I, MTy->getReturnType(), CTMap);
|
|
}
|
|
|
|
const PointerType *MPtr = cast<PointerType>(I->getOperand(0)->getType());
|
|
const FunctionType *MTy = cast<FunctionType>(MPtr->getElementType());
|
|
if (!MTy->isVarArg()) return false;
|
|
|
|
if ((OpNum-1) < MTy->getParamTypes().size())
|
|
return false; // It's not in the varargs section...
|
|
|
|
// If we get this far, we know the value is in the varargs section of the
|
|
// function! We can convert if we don't reinterpret the value...
|
|
//
|
|
return Ty->isLosslesslyConvertableTo(V->getType());
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
void ConvertValueToNewType(Value *V, Value *NewVal, ValueMapCache &VMC) {
|
|
ValueHandle VH(VMC, V);
|
|
|
|
unsigned NumUses = V->use_size();
|
|
for (unsigned It = 0; It < NumUses; ) {
|
|
unsigned OldSize = NumUses;
|
|
ConvertOperandToType(*(V->use_begin()+It), V, NewVal, VMC);
|
|
NumUses = V->use_size();
|
|
if (NumUses == OldSize) ++It;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static void ConvertOperandToType(User *U, Value *OldVal, Value *NewVal,
|
|
ValueMapCache &VMC) {
|
|
if (isa<ValueHandle>(U)) return; // Valuehandles don't let go of operands...
|
|
|
|
if (VMC.OperandsMapped.count(U)) return;
|
|
VMC.OperandsMapped.insert(U);
|
|
|
|
ValueMapCache::ExprMapTy::iterator VMCI = VMC.ExprMap.find(U);
|
|
if (VMCI != VMC.ExprMap.end())
|
|
return;
|
|
|
|
|
|
Instruction *I = cast<Instruction>(U); // Only Instructions convertable
|
|
|
|
BasicBlock *BB = I->getParent();
|
|
BasicBlock::InstListType &BIL = BB->getInstList();
|
|
std::string Name = I->getName(); if (!Name.empty()) I->setName("");
|
|
Instruction *Res; // Result of conversion
|
|
|
|
//cerr << endl << endl << "Type:\t" << Ty << "\nInst: " << I << "BB Before: " << BB << endl;
|
|
|
|
// Prevent I from being removed...
|
|
ValueHandle IHandle(VMC, I);
|
|
|
|
const Type *NewTy = NewVal->getType();
|
|
Constant *Dummy = (NewTy != Type::VoidTy) ?
|
|
Constant::getNullValue(NewTy) : 0;
|
|
|
|
switch (I->getOpcode()) {
|
|
case Instruction::Cast:
|
|
assert(I->getOperand(0) == OldVal);
|
|
Res = new CastInst(NewVal, I->getType(), Name);
|
|
break;
|
|
|
|
case Instruction::Add:
|
|
if (isa<PointerType>(NewTy)) {
|
|
Value *IndexVal = I->getOperand(OldVal == I->getOperand(0) ? 1 : 0);
|
|
std::vector<Value*> Indices;
|
|
BasicBlock::iterator It = find(BIL.begin(), BIL.end(), I);
|
|
|
|
if (const Type *ETy = ConvertableToGEP(NewTy, IndexVal, Indices, &It)) {
|
|
// If successful, convert the add to a GEP
|
|
//const Type *RetTy = PointerType::get(ETy);
|
|
// First operand is actually the given pointer...
|
|
Res = new GetElementPtrInst(NewVal, Indices, Name);
|
|
assert(cast<PointerType>(Res->getType())->getElementType() == ETy &&
|
|
"ConvertableToGEP broken!");
|
|
break;
|
|
}
|
|
}
|
|
// FALLTHROUGH
|
|
|
|
case Instruction::Sub:
|
|
case Instruction::SetEQ:
|
|
case Instruction::SetNE: {
|
|
Res = BinaryOperator::create(cast<BinaryOperator>(I)->getOpcode(),
|
|
Dummy, Dummy, Name);
|
|
VMC.ExprMap[I] = Res; // Add node to expression eagerly
|
|
|
|
unsigned OtherIdx = (OldVal == I->getOperand(0)) ? 1 : 0;
|
|
Value *OtherOp = I->getOperand(OtherIdx);
|
|
Value *NewOther = ConvertExpressionToType(OtherOp, NewTy, VMC);
|
|
|
|
Res->setOperand(OtherIdx, NewOther);
|
|
Res->setOperand(!OtherIdx, NewVal);
|
|
break;
|
|
}
|
|
case Instruction::Shl:
|
|
case Instruction::Shr:
|
|
assert(I->getOperand(0) == OldVal);
|
|
Res = new ShiftInst(cast<ShiftInst>(I)->getOpcode(), NewVal,
|
|
I->getOperand(1), Name);
|
|
break;
|
|
|
|
case Instruction::Free: // Free can free any pointer type!
|
|
assert(I->getOperand(0) == OldVal);
|
|
Res = new FreeInst(NewVal);
|
|
break;
|
|
|
|
|
|
case Instruction::Load: {
|
|
assert(I->getOperand(0) == OldVal && isa<PointerType>(NewVal->getType()));
|
|
const Type *LoadedTy =
|
|
cast<PointerType>(NewVal->getType())->getElementType();
|
|
|
|
std::vector<Value*> Indices;
|
|
Indices.push_back(ConstantUInt::get(Type::UIntTy, 0));
|
|
|
|
if (const CompositeType *CT = dyn_cast<CompositeType>(LoadedTy)) {
|
|
unsigned Offset = 0; // No offset, get first leaf.
|
|
LoadedTy = getStructOffsetType(CT, Offset, Indices, false);
|
|
}
|
|
assert(LoadedTy->isFirstClassType());
|
|
|
|
Res = new LoadInst(NewVal, Indices, Name);
|
|
assert(Res->getType()->isFirstClassType() && "Load of structure or array!");
|
|
break;
|
|
}
|
|
|
|
case Instruction::Store: {
|
|
if (I->getOperand(0) == OldVal) { // Replace the source value
|
|
const PointerType *NewPT = PointerType::get(NewTy);
|
|
Res = new StoreInst(NewVal, Constant::getNullValue(NewPT));
|
|
VMC.ExprMap[I] = Res;
|
|
Res->setOperand(1, ConvertExpressionToType(I->getOperand(1), NewPT, VMC));
|
|
} else { // Replace the source pointer
|
|
const Type *ValTy = cast<PointerType>(NewTy)->getElementType();
|
|
std::vector<Value*> Indices;
|
|
|
|
if (isa<StructType>(ValTy)) {
|
|
unsigned Offset = 0;
|
|
Indices.push_back(ConstantUInt::get(Type::UIntTy, 0));
|
|
ValTy = getStructOffsetType(ValTy, Offset, Indices, false);
|
|
assert(Offset == 0 && ValTy);
|
|
}
|
|
|
|
Res = new StoreInst(Constant::getNullValue(ValTy), NewVal, Indices);
|
|
VMC.ExprMap[I] = Res;
|
|
Res->setOperand(0, ConvertExpressionToType(I->getOperand(0), ValTy, VMC));
|
|
}
|
|
break;
|
|
}
|
|
|
|
|
|
case Instruction::GetElementPtr: {
|
|
// Convert a one index getelementptr into just about anything that is
|
|
// desired.
|
|
//
|
|
BasicBlock::iterator It = find(BIL.begin(), BIL.end(), I);
|
|
const Type *OldElTy = cast<PointerType>(I->getType())->getElementType();
|
|
unsigned DataSize = TD.getTypeSize(OldElTy);
|
|
Value *Index = I->getOperand(1);
|
|
|
|
if (DataSize != 1) {
|
|
// Insert a multiply of the old element type is not a unit size...
|
|
Index = BinaryOperator::create(Instruction::Mul, Index,
|
|
ConstantUInt::get(Type::UIntTy, DataSize));
|
|
It = BIL.insert(It, cast<Instruction>(Index))+1;
|
|
}
|
|
|
|
// Perform the conversion now...
|
|
//
|
|
std::vector<Value*> Indices;
|
|
const Type *ElTy = ConvertableToGEP(NewVal->getType(), Index, Indices, &It);
|
|
assert(ElTy != 0 && "GEP Conversion Failure!");
|
|
Res = new GetElementPtrInst(NewVal, Indices, Name);
|
|
assert(Res->getType() == PointerType::get(ElTy) &&
|
|
"ConvertableToGet failed!");
|
|
}
|
|
#if 0
|
|
if (I->getType() == PointerType::get(Type::SByteTy)) {
|
|
// Convert a getelementptr sbyte * %reg111, uint 16 freely back to
|
|
// anything that is a pointer type...
|
|
//
|
|
BasicBlock::iterator It = find(BIL.begin(), BIL.end(), I);
|
|
|
|
// Check to see if the second argument is an expression that can
|
|
// be converted to the appropriate size... if so, allow it.
|
|
//
|
|
std::vector<Value*> Indices;
|
|
const Type *ElTy = ConvertableToGEP(NewVal->getType(), I->getOperand(1),
|
|
Indices, &It);
|
|
assert(ElTy != 0 && "GEP Conversion Failure!");
|
|
|
|
Res = new GetElementPtrInst(NewVal, Indices, Name);
|
|
} else {
|
|
// Convert a getelementptr ulong * %reg123, uint %N
|
|
// to getelementptr long * %reg123, uint %N
|
|
// ... where the type must simply stay the same size...
|
|
//
|
|
Res = new GetElementPtrInst(NewVal,
|
|
cast<GetElementPtrInst>(I)->copyIndices(),
|
|
Name);
|
|
}
|
|
#endif
|
|
break;
|
|
|
|
case Instruction::PHINode: {
|
|
PHINode *OldPN = cast<PHINode>(I);
|
|
PHINode *NewPN = new PHINode(NewTy, Name);
|
|
VMC.ExprMap[I] = NewPN;
|
|
|
|
while (OldPN->getNumOperands()) {
|
|
BasicBlock *BB = OldPN->getIncomingBlock(0);
|
|
Value *OldVal = OldPN->getIncomingValue(0);
|
|
OldPN->removeIncomingValue(BB);
|
|
Value *V = ConvertExpressionToType(OldVal, NewTy, VMC);
|
|
NewPN->addIncoming(V, BB);
|
|
}
|
|
Res = NewPN;
|
|
break;
|
|
}
|
|
|
|
case Instruction::Call: {
|
|
Value *Meth = I->getOperand(0);
|
|
std::vector<Value*> Params(I->op_begin()+1, I->op_end());
|
|
|
|
if (Meth == OldVal) { // Changing the function pointer?
|
|
PointerType *NewPTy = cast<PointerType>(NewVal->getType());
|
|
FunctionType *NewTy = cast<FunctionType>(NewPTy->getElementType());
|
|
const FunctionType::ParamTypes &PTs = NewTy->getParamTypes();
|
|
|
|
// Get an iterator to the call instruction so that we can insert casts for
|
|
// operands if needbe. Note that we do not require operands to be
|
|
// convertable, we can insert casts if they are convertible but not
|
|
// compatible. The reason for this is that we prefer to have resolved
|
|
// functions but casted arguments if possible.
|
|
//
|
|
BasicBlock::iterator It = find(BIL.begin(), BIL.end(), I);
|
|
|
|
// Convert over all of the call operands to their new types... but only
|
|
// convert over the part that is not in the vararg section of the call.
|
|
//
|
|
for (unsigned i = 0; i < PTs.size(); ++i)
|
|
if (Params[i]->getType() != PTs[i]) {
|
|
// Create a cast to convert it to the right type, we know that this
|
|
// is a lossless cast...
|
|
//
|
|
Params[i] = new CastInst(Params[i], PTs[i], "call.resolve.cast");
|
|
It = BIL.insert(It, cast<Instruction>(Params[i]))+1;
|
|
}
|
|
Meth = NewVal; // Update call destination to new value
|
|
|
|
} else { // Changing an argument, must be in vararg area
|
|
std::vector<Value*>::iterator OI =
|
|
find(Params.begin(), Params.end(), OldVal);
|
|
assert (OI != Params.end() && "Not using value!");
|
|
|
|
*OI = NewVal;
|
|
}
|
|
|
|
Res = new CallInst(Meth, Params, Name);
|
|
break;
|
|
}
|
|
default:
|
|
assert(0 && "Expression convertable, but don't know how to convert?");
|
|
return;
|
|
}
|
|
|
|
// If the instruction was newly created, insert it into the instruction
|
|
// stream.
|
|
//
|
|
BasicBlock::iterator It = find(BIL.begin(), BIL.end(), I);
|
|
assert(It != BIL.end() && "Instruction not in own basic block??");
|
|
BIL.insert(It, Res); // Keep It pointing to old instruction
|
|
|
|
DEBUG(cerr << "COT CREATED: " << (void*)Res << " " << Res
|
|
<< "In: " << (void*)I << " " << I << "Out: " << (void*)Res
|
|
<< " " << Res);
|
|
|
|
// Add the instruction to the expression map
|
|
VMC.ExprMap[I] = Res;
|
|
|
|
if (I->getType() != Res->getType())
|
|
ConvertValueToNewType(I, Res, VMC);
|
|
else {
|
|
for (unsigned It = 0; It < I->use_size(); ) {
|
|
User *Use = *(I->use_begin()+It);
|
|
if (isa<ValueHandle>(Use)) // Don't remove ValueHandles!
|
|
++It;
|
|
else
|
|
Use->replaceUsesOfWith(I, Res);
|
|
}
|
|
|
|
if (I->use_empty()) {
|
|
// Now we just need to remove the old instruction so we don't get infinite
|
|
// loops. Note that we cannot use DCE because DCE won't remove a store
|
|
// instruction, for example.
|
|
//
|
|
DEBUG(cerr << "DELETING: " << (void*)I << " " << I);
|
|
BIL.remove(I);
|
|
VMC.OperandsMapped.erase(I);
|
|
VMC.ExprMap.erase(I);
|
|
delete I;
|
|
} else {
|
|
for (Value::use_iterator UI = I->use_begin(), UE = I->use_end();
|
|
UI != UE; ++UI)
|
|
assert(isa<ValueHandle>((Value*)*UI) &&"Uses of Instruction remain!!!");
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
ValueHandle::ValueHandle(ValueMapCache &VMC, Value *V)
|
|
: Instruction(Type::VoidTy, UserOp1, ""), Cache(VMC) {
|
|
//DEBUG(cerr << "VH AQUIRING: " << (void*)V << " " << V);
|
|
Operands.push_back(Use(V, this));
|
|
}
|
|
|
|
static void RecursiveDelete(ValueMapCache &Cache, Instruction *I) {
|
|
if (!I || !I->use_empty()) return;
|
|
|
|
assert(I->getParent() && "Inst not in basic block!");
|
|
|
|
//DEBUG(cerr << "VH DELETING: " << (void*)I << " " << I);
|
|
|
|
for (User::op_iterator OI = I->op_begin(), OE = I->op_end();
|
|
OI != OE; ++OI)
|
|
if (Instruction *U = dyn_cast<Instruction>(*OI)) {
|
|
*OI = 0;
|
|
RecursiveDelete(Cache, U);
|
|
}
|
|
|
|
I->getParent()->getInstList().remove(I);
|
|
|
|
Cache.OperandsMapped.erase(I);
|
|
Cache.ExprMap.erase(I);
|
|
delete I;
|
|
}
|
|
|
|
ValueHandle::~ValueHandle() {
|
|
if (Operands[0]->use_size() == 1) {
|
|
Value *V = Operands[0];
|
|
Operands[0] = 0; // Drop use!
|
|
|
|
// Now we just need to remove the old instruction so we don't get infinite
|
|
// loops. Note that we cannot use DCE because DCE won't remove a store
|
|
// instruction, for example.
|
|
//
|
|
RecursiveDelete(Cache, dyn_cast<Instruction>(V));
|
|
} else {
|
|
//DEBUG(cerr << "VH RELEASING: " << (void*)Operands[0].get() << " "
|
|
// << Operands[0]->use_size() << " " << Operands[0]);
|
|
}
|
|
}
|