mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25509 91177308-0d34-0410-b5e6-96231b3b80d8
1006 lines
37 KiB
C++
1006 lines
37 KiB
C++
//===- ExprTypeConvert.cpp - Code to change an LLVM Expr Type -------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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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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// convertible, 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/Constants.h"
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#include "llvm/Instructions.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Support/Debug.h"
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#include <algorithm>
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#include <iostream>
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using namespace llvm;
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static bool OperandConvertibleToType(User *U, Value *V, const Type *Ty,
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ValueTypeCache &ConvertedTypes,
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const TargetData &TD);
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static void ConvertOperandToType(User *U, Value *OldVal, Value *NewVal,
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ValueMapCache &VMC, const TargetData &TD);
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// ExpressionConvertibleToType - Return true if it is possible
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bool llvm::ExpressionConvertibleToType(Value *V, const Type *Ty,
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ValueTypeCache &CTMap, const TargetData &TD) {
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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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// If it's a constant... all constants can be converted to a different
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// type.
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//
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if (isa<Constant>(V) && !isa<GlobalValue>(V))
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return true;
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CTMap[V] = Ty;
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if (V->getType() == Ty) return true; // Expression already correct type!
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Instruction *I = dyn_cast<Instruction>(V);
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if (I == 0) return false; // Otherwise, we can't convert!
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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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// convertible to the requested type.
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if (!Ty->isLosslesslyConvertibleTo(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 (const PointerType *SPT =
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dyn_cast<PointerType>(I->getOperand(0)->getType()))
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if (const PointerType *DPT = dyn_cast<PointerType>(I->getType()))
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if (const 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 (!Ty->isInteger() && !Ty->isFloatingPoint()) return false;
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if (!ExpressionConvertibleToType(I->getOperand(0), Ty, CTMap, TD) ||
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!ExpressionConvertibleToType(I->getOperand(1), Ty, CTMap, TD))
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return false;
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break;
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case Instruction::Shr:
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if (!Ty->isInteger()) return false;
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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 (!Ty->isInteger()) return false;
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if (!ExpressionConvertibleToType(I->getOperand(0), Ty, CTMap, TD))
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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 (!ExpressionConvertibleToType(LI->getPointerOperand(),
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PointerType::get(Ty), CTMap, TD))
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return false;
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break;
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}
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case Instruction::PHI: {
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PHINode *PN = cast<PHINode>(I);
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// Be conservative if we find a giant PHI node.
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if (PN->getNumIncomingValues() > 32) return false;
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for (unsigned i = 0; i < PN->getNumIncomingValues(); ++i)
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if (!ExpressionConvertibleToType(PN->getIncomingValue(i), Ty, CTMap, TD))
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return false;
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break;
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}
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case Instruction::GetElementPtr: {
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// GetElementPtr's are directly convertible 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->idx_begin(), GEP->idx_end());
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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() &&
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Indices.back() == Constant::getNullValue(Indices.back()->getType())){
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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, it could be that we have something like this:
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// getelementptr [[sbyte] *] * %reg115, long %reg138 ; [sbyte]**
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// and want to convert it into something like this:
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// getelemenptr [[int] *] * %reg115, long %reg138 ; [int]**
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//
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if (GEP->getNumOperands() == 2 &&
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PTy->getElementType()->isSized() &&
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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 (!ExpressionConvertibleToType(I->getOperand(0), NewSrcTy, CTMap, TD))
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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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case Instruction::Call: {
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if (isa<Function>(I->getOperand(0)))
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return false; // Don't even try to change direct calls.
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// If this is a function pointer, we can convert the return type if we can
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// convert the source function pointer.
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//
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const PointerType *PT = cast<PointerType>(I->getOperand(0)->getType());
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const FunctionType *FT = cast<FunctionType>(PT->getElementType());
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std::vector<const Type *> ArgTys(FT->param_begin(), FT->param_end());
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const FunctionType *NewTy =
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FunctionType::get(Ty, ArgTys, FT->isVarArg());
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if (!ExpressionConvertibleToType(I->getOperand(0),
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PointerType::get(NewTy), CTMap, TD))
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return false;
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break;
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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 convertible 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 (!OperandConvertibleToType(*It, I, Ty, CTMap, TD))
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return false;
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return true;
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}
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Value *llvm::ConvertExpressionToType(Value *V, const Type *Ty,
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ValueMapCache &VMC, const TargetData &TD) {
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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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const Value *GV = VMCI->second;
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const Type *GTy = VMCI->second->getType();
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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(std::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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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 = ConstantExpr::getCast(CPV, Ty);
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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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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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assert(VMC.NewCasts.count(ValueHandle(VMC, I)) == 0);
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Res = new CastInst(I->getOperand(0), Ty, Name);
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VMC.NewCasts.insert(ValueHandle(VMC, Res));
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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, TD));
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Res->setOperand(1, ConvertExpressionToType(I->getOperand(1), Ty, VMC, TD));
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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, TD));
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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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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, TD));
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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::PHI: {
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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, false);
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Value *V = ConvertExpressionToType(OldVal, Ty, VMC, TD);
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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::GetElementPtr: {
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// GetElementPtr's are directly convertible 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->idx_begin(), GEP->idx_end());
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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() &&
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Indices.back() == Constant::getNullValue(Indices.back()->getType())){
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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)
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Res = new CastInst(GEP->getPointerOperand(), BaseType); // NOOP CAST
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else
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Res = new GetElementPtrInst(GEP->getPointerOperand(), Indices, Name);
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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 (Res == 0) {
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const PointerType *NewSrcTy = PointerType::get(PVTy);
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std::vector<Value*> Indices(GEP->idx_begin(), GEP->idx_end());
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Res = new GetElementPtrInst(Constant::getNullValue(NewSrcTy),
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Indices, Name);
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VMC.ExprMap[I] = Res;
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Res->setOperand(0, ConvertExpressionToType(I->getOperand(0),
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NewSrcTy, VMC, TD));
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}
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assert(Res && "Didn't find match!");
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break;
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}
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case Instruction::Call: {
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assert(!isa<Function>(I->getOperand(0)));
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// If this is a function pointer, we can convert the return type if we can
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// convert the source function pointer.
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//
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const PointerType *PT = cast<PointerType>(I->getOperand(0)->getType());
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const FunctionType *FT = cast<FunctionType>(PT->getElementType());
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std::vector<const Type *> ArgTys(FT->param_begin(), FT->param_end());
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const FunctionType *NewTy =
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FunctionType::get(Ty, ArgTys, FT->isVarArg());
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const PointerType *NewPTy = PointerType::get(NewTy);
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if (Ty == Type::VoidTy)
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Name = ""; // Make sure not to name calls that now return void!
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Res = new CallInst(Constant::getNullValue(NewPTy),
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std::vector<Value*>(I->op_begin()+1, I->op_end()),
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Name);
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if (cast<CallInst>(I)->isTailCall())
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cast<CallInst>(Res)->setTailCall();
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cast<CallInst>(Res)->setCallingConv(cast<CallInst>(I)->getCallingConv());
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VMC.ExprMap[I] = Res;
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Res->setOperand(0, ConvertExpressionToType(I->getOperand(0),NewPTy,VMC,TD));
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break;
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}
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default:
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assert(0 && "Expression convertible, but don't know how to convert?");
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return 0;
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}
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assert(Res->getType() == Ty && "Didn't convert expr to correct type!");
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BB->getInstList().insert(I, Res);
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// Add the instruction to the expression map
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VMC.ExprMap[I] = Res;
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//// WTF is this code! FIXME: remove this.
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unsigned NumUses = I->getNumUses();
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for (unsigned It = 0; It < NumUses; ) {
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unsigned OldSize = NumUses;
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Value::use_iterator UI = I->use_begin();
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std::advance(UI, It);
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ConvertOperandToType(*UI, I, Res, VMC, TD);
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NumUses = I->getNumUses();
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if (NumUses == OldSize) ++It;
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}
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DEBUG(std::cerr << "ExpIn: " << (void*)I << " " << *I
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<< "ExpOut: " << (void*)Res << " " << *Res);
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return Res;
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}
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// ValueConvertibleToType - Return true if it is possible
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bool llvm::ValueConvertibleToType(Value *V, const Type *Ty,
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ValueTypeCache &ConvertedTypes,
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const TargetData &TD) {
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ValueTypeCache::iterator I = ConvertedTypes.find(V);
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if (I != ConvertedTypes.end()) return I->second == Ty;
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ConvertedTypes[V] = Ty;
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// It is safe to convert the specified value to the specified type IFF all of
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// the uses of the value can be converted to accept the new typed value.
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//
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if (V->getType() != Ty) {
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for (Value::use_iterator I = V->use_begin(), E = V->use_end(); I != E; ++I)
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if (!OperandConvertibleToType(*I, V, Ty, ConvertedTypes, TD))
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return false;
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}
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return true;
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}
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// OperandConvertibleToType - Return true if it is possible to convert operand
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// V of User (instruction) U to the specified type. This is true iff it is
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// possible to change the specified instruction to accept this. CTMap is a map
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// of converted types, so that circular definitions will see the future type of
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// the expression, not the static current type.
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//
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static bool OperandConvertibleToType(User *U, Value *V, const Type *Ty,
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ValueTypeCache &CTMap,
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const TargetData &TD) {
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// if (V->getType() == Ty) return true; // Operand already the right 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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Instruction *I = dyn_cast<Instruction>(U);
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if (I == 0) return false; // We can't convert!
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switch (I->getOpcode()) {
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case Instruction::Cast:
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assert(I->getOperand(0) == V);
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// We can convert the expr if the cast destination type is losslessly
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// convertible to the requested type.
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// Also, do not change a cast that is a noop cast. For all intents and
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// purposes it should be eliminated.
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if (!Ty->isLosslesslyConvertibleTo(I->getOperand(0)->getType()) ||
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I->getType() == I->getOperand(0)->getType())
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return false;
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// Do not allow a 'cast ushort %V to uint' to have it's first operand be
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// converted to a 'short' type. Doing so changes the way sign promotion
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// happens, and breaks things. Only allow the cast to take place if the
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// signedness doesn't change... or if the current cast is not a lossy
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// conversion.
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//
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if (!I->getType()->isLosslesslyConvertibleTo(I->getOperand(0)->getType()) &&
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I->getOperand(0)->getType()->isSigned() != Ty->isSigned())
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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 (const PointerType *SPT =
|
|
dyn_cast<PointerType>(I->getOperand(0)->getType()))
|
|
if (const PointerType *DPT = dyn_cast<PointerType>(I->getType()))
|
|
if (const ArrayType *AT = dyn_cast<ArrayType>(SPT->getElementType()))
|
|
if (AT->getElementType() == DPT->getElementType())
|
|
return false;
|
|
return true;
|
|
|
|
case Instruction::Add:
|
|
case Instruction::Sub: {
|
|
if (!Ty->isInteger() && !Ty->isFloatingPoint()) return false;
|
|
|
|
Value *OtherOp = I->getOperand((V == I->getOperand(0)) ? 1 : 0);
|
|
return ValueConvertibleToType(I, Ty, CTMap, TD) &&
|
|
ExpressionConvertibleToType(OtherOp, Ty, CTMap, TD);
|
|
}
|
|
case Instruction::SetEQ:
|
|
case Instruction::SetNE: {
|
|
Value *OtherOp = I->getOperand((V == I->getOperand(0)) ? 1 : 0);
|
|
return ExpressionConvertibleToType(OtherOp, Ty, CTMap, TD);
|
|
}
|
|
case Instruction::Shr:
|
|
if (Ty->isSigned() != V->getType()->isSigned()) return false;
|
|
// FALL THROUGH
|
|
case Instruction::Shl:
|
|
if (I->getOperand(1) == V) return false; // Cannot change shift amount type
|
|
if (!Ty->isInteger()) return false;
|
|
return ValueConvertibleToType(I, Ty, CTMap, TD);
|
|
|
|
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);
|
|
|
|
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, TD, false);
|
|
assert(Offset == 0 && "Offset changed from zero???");
|
|
}
|
|
|
|
if (!LoadedTy->isFirstClassType())
|
|
return false;
|
|
|
|
if (TD.getTypeSize(LoadedTy) != TD.getTypeSize(LI->getType()))
|
|
return false;
|
|
|
|
return ValueConvertibleToType(LI, LoadedTy, CTMap, TD);
|
|
}
|
|
return false;
|
|
|
|
case Instruction::Store: {
|
|
StoreInst *SI = cast<StoreInst>(I);
|
|
|
|
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 necessary 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 (const StructType *SElTy = dyn_cast<StructType>(ElTy)) {
|
|
unsigned Offset = 0;
|
|
std::vector<Value*> Indices;
|
|
ElTy = getStructOffsetType(ElTy, Offset, Indices, TD, 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 ExpressionConvertibleToType(I->getOperand(1), PointerType::get(Ty),
|
|
CTMap, TD);
|
|
} 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, TD, 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 (!ElTy->isSized() ||
|
|
TD.getTypeSize(ElTy) != TD.getTypeSize(I->getOperand(0)->getType()))
|
|
return false;
|
|
|
|
// Can convert store if the incoming value is convertible and if the
|
|
// result will preserve semantics...
|
|
const Type *Op0Ty = I->getOperand(0)->getType();
|
|
if (!(Op0Ty->isIntegral() ^ ElTy->isIntegral()) &&
|
|
!(Op0Ty->isFloatingPoint() ^ ElTy->isFloatingPoint()))
|
|
return ExpressionConvertibleToType(I->getOperand(0), ElTy, CTMap, TD);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
case Instruction::PHI: {
|
|
PHINode *PN = cast<PHINode>(I);
|
|
// Be conservative if we find a giant PHI node.
|
|
if (PN->getNumIncomingValues() > 32) return false;
|
|
|
|
for (unsigned i = 0; i < PN->getNumIncomingValues(); ++i)
|
|
if (!ExpressionConvertibleToType(PN->getIncomingValue(i), Ty, CTMap, TD))
|
|
return false;
|
|
return ValueConvertibleToType(PN, Ty, CTMap, TD);
|
|
}
|
|
|
|
case Instruction::Call: {
|
|
User::op_iterator OI = std::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) {
|
|
const PointerType *PTy = dyn_cast<PointerType>(Ty);
|
|
if (PTy == 0) return false; // Can't convert to a non-pointer type...
|
|
const FunctionType *FTy = dyn_cast<FunctionType>(PTy->getElementType());
|
|
if (FTy == 0) return false; // Can't convert to a non ptr to function...
|
|
|
|
// Do not allow converting to a call where all of the operands are ...'s
|
|
if (FTy->getNumParams() == 0 && FTy->isVarArg())
|
|
return false; // Do not permit this conversion!
|
|
|
|
// 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 < FTy->getNumParams()) return false;
|
|
|
|
// Unless this is a vararg function type, we cannot provide more arguments
|
|
// than are desired...
|
|
//
|
|
if (!FTy->isVarArg() && NumArgs > FTy->getNumParams())
|
|
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 convertible,
|
|
// 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.
|
|
//
|
|
for (unsigned i = 0, NA = FTy->getNumParams(); i < NA; ++i)
|
|
if (!FTy->getParamType(i)->isLosslesslyConvertibleTo(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
|
|
// necessary...
|
|
//
|
|
return ValueConvertibleToType(I, FTy->getReturnType(), CTMap, TD);
|
|
}
|
|
|
|
const PointerType *MPtr = cast<PointerType>(I->getOperand(0)->getType());
|
|
const FunctionType *FTy = cast<FunctionType>(MPtr->getElementType());
|
|
if (!FTy->isVarArg()) return false;
|
|
|
|
if ((OpNum-1) < FTy->getNumParams())
|
|
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->isLosslesslyConvertibleTo(V->getType());
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
void llvm::ConvertValueToNewType(Value *V, Value *NewVal, ValueMapCache &VMC,
|
|
const TargetData &TD) {
|
|
ValueHandle VH(VMC, V);
|
|
|
|
// FIXME: This is horrible!
|
|
unsigned NumUses = V->getNumUses();
|
|
for (unsigned It = 0; It < NumUses; ) {
|
|
unsigned OldSize = NumUses;
|
|
Value::use_iterator UI = V->use_begin();
|
|
std::advance(UI, It);
|
|
ConvertOperandToType(*UI, V, NewVal, VMC, TD);
|
|
NumUses = V->getNumUses();
|
|
if (NumUses == OldSize) ++It;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static void ConvertOperandToType(User *U, Value *OldVal, Value *NewVal,
|
|
ValueMapCache &VMC, const TargetData &TD) {
|
|
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 convertible
|
|
|
|
BasicBlock *BB = I->getParent();
|
|
assert(BB != 0 && "Instruction not embedded in basic block!");
|
|
std::string Name = I->getName();
|
|
I->setName("");
|
|
Instruction *Res; // Result of conversion
|
|
|
|
//std::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:
|
|
if (VMC.NewCasts.count(ValueHandle(VMC, I))) {
|
|
// This cast has already had it's value converted, causing a new cast to
|
|
// be created. We don't want to create YET ANOTHER cast instruction
|
|
// representing the original one, so just modify the operand of this cast
|
|
// instruction, which we know is newly created.
|
|
I->setOperand(0, NewVal);
|
|
I->setName(Name); // give I its name back
|
|
return;
|
|
|
|
} else {
|
|
Res = new CastInst(NewVal, I->getType(), Name);
|
|
}
|
|
break;
|
|
|
|
case Instruction::Add:
|
|
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);
|
|
Res->setOperand(!OtherIdx, NewVal);
|
|
Value *NewOther = ConvertExpressionToType(OtherOp, NewTy, VMC, TD);
|
|
Res->setOperand(OtherIdx, NewOther);
|
|
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();
|
|
|
|
Value *Src = NewVal;
|
|
|
|
if (const CompositeType *CT = dyn_cast<CompositeType>(LoadedTy)) {
|
|
std::vector<Value*> Indices;
|
|
Indices.push_back(Constant::getNullValue(Type::UIntTy));
|
|
|
|
unsigned Offset = 0; // No offset, get first leaf.
|
|
LoadedTy = getStructOffsetType(CT, Offset, Indices, TD, false);
|
|
assert(LoadedTy->isFirstClassType());
|
|
|
|
if (Indices.size() != 1) { // Do not generate load X, 0
|
|
// Insert the GEP instruction before this load.
|
|
Src = new GetElementPtrInst(Src, Indices, Name+".idx", I);
|
|
}
|
|
}
|
|
|
|
Res = new LoadInst(Src, Name);
|
|
assert(Res->getType()->isFirstClassType() && "Load of structure or array!");
|
|
break;
|
|
}
|
|
|
|
case Instruction::Store: {
|
|
if (I->getOperand(0) == OldVal) { // Replace the source value
|
|
// Check to see if operand #1 has already been converted...
|
|
ValueMapCache::ExprMapTy::iterator VMCI =
|
|
VMC.ExprMap.find(I->getOperand(1));
|
|
if (VMCI != VMC.ExprMap.end()) {
|
|
// Comments describing this stuff are in the OperandConvertibleToType
|
|
// switch statement for Store...
|
|
//
|
|
const Type *ElTy =
|
|
cast<PointerType>(VMCI->second->getType())->getElementType();
|
|
|
|
Value *SrcPtr = VMCI->second;
|
|
|
|
if (ElTy != NewTy) {
|
|
// We check that this is a struct in the initial scan...
|
|
const StructType *SElTy = cast<StructType>(ElTy);
|
|
|
|
std::vector<Value*> Indices;
|
|
Indices.push_back(Constant::getNullValue(Type::UIntTy));
|
|
|
|
unsigned Offset = 0;
|
|
const Type *Ty = getStructOffsetType(ElTy, Offset, Indices, TD,false);
|
|
assert(Offset == 0 && "Offset changed!");
|
|
assert(NewTy == Ty && "Did not convert to correct type!");
|
|
|
|
// Insert the GEP instruction before this store.
|
|
SrcPtr = new GetElementPtrInst(SrcPtr, Indices,
|
|
SrcPtr->getName()+".idx", I);
|
|
}
|
|
Res = new StoreInst(NewVal, SrcPtr);
|
|
|
|
VMC.ExprMap[I] = Res;
|
|
} else {
|
|
// Otherwise, we haven't converted Operand #1 over yet...
|
|
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, TD));
|
|
}
|
|
} else { // Replace the source pointer
|
|
const Type *ValTy = cast<PointerType>(NewTy)->getElementType();
|
|
|
|
Value *SrcPtr = NewVal;
|
|
|
|
if (isa<StructType>(ValTy)) {
|
|
std::vector<Value*> Indices;
|
|
Indices.push_back(Constant::getNullValue(Type::UIntTy));
|
|
|
|
unsigned Offset = 0;
|
|
ValTy = getStructOffsetType(ValTy, Offset, Indices, TD, false);
|
|
|
|
assert(Offset == 0 && ValTy);
|
|
|
|
// Insert the GEP instruction before this store.
|
|
SrcPtr = new GetElementPtrInst(SrcPtr, Indices,
|
|
SrcPtr->getName()+".idx", I);
|
|
}
|
|
|
|
Res = new StoreInst(Constant::getNullValue(ValTy), SrcPtr);
|
|
VMC.ExprMap[I] = Res;
|
|
Res->setOperand(0, ConvertExpressionToType(I->getOperand(0),
|
|
ValTy, VMC, TD));
|
|
}
|
|
break;
|
|
}
|
|
|
|
case Instruction::PHI: {
|
|
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);
|
|
ValueHandle OldValHandle(VMC, OldVal);
|
|
OldPN->removeIncomingValue(BB, false);
|
|
Value *V = ConvertExpressionToType(OldVal, NewTy, VMC, TD);
|
|
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?
|
|
const PointerType *NewPTy = cast<PointerType>(NewVal->getType());
|
|
const FunctionType *NewTy = cast<FunctionType>(NewPTy->getElementType());
|
|
|
|
if (NewTy->getReturnType() == Type::VoidTy)
|
|
Name = ""; // Make sure not to name a void call!
|
|
|
|
// Get an iterator to the call instruction so that we can insert casts for
|
|
// operands if need be. Note that we do not require operands to be
|
|
// convertible, 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 = 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 != NewTy->getNumParams(); ++i)
|
|
if (Params[i]->getType() != NewTy->getParamType(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], NewTy->getParamType(i),
|
|
"callarg.cast." +
|
|
Params[i]->getName(), It);
|
|
}
|
|
Meth = NewVal; // Update call destination to new value
|
|
|
|
} else { // Changing an argument, must be in vararg area
|
|
std::vector<Value*>::iterator OI =
|
|
std::find(Params.begin(), Params.end(), OldVal);
|
|
assert (OI != Params.end() && "Not using value!");
|
|
|
|
*OI = NewVal;
|
|
}
|
|
|
|
Res = new CallInst(Meth, Params, Name);
|
|
if (cast<CallInst>(I)->isTailCall())
|
|
cast<CallInst>(Res)->setTailCall();
|
|
cast<CallInst>(Res)->setCallingConv(cast<CallInst>(I)->getCallingConv());
|
|
break;
|
|
}
|
|
default:
|
|
assert(0 && "Expression convertible, but don't know how to convert?");
|
|
return;
|
|
}
|
|
|
|
// If the instruction was newly created, insert it into the instruction
|
|
// stream.
|
|
//
|
|
BasicBlock::iterator It = I;
|
|
assert(It != BB->end() && "Instruction not in own basic block??");
|
|
BB->getInstList().insert(It, Res); // Keep It pointing to old instruction
|
|
|
|
DEBUG(std::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, TD);
|
|
else {
|
|
for (Value::use_iterator UI = I->use_begin(), E = I->use_end();
|
|
UI != E; )
|
|
if (isa<ValueHandle>(*UI)) {
|
|
++UI;
|
|
} else {
|
|
Use &U = UI.getUse();
|
|
++UI; // Do not invalidate UI.
|
|
U.set(Res);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
ValueHandle::ValueHandle(ValueMapCache &VMC, Value *V)
|
|
: Instruction(Type::VoidTy, UserOp1, &Op, 1, ""), Op(V, this), Cache(VMC) {
|
|
//DEBUG(std::cerr << "VH AQUIRING: " << (void*)V << " " << V);
|
|
}
|
|
|
|
ValueHandle::ValueHandle(const ValueHandle &VH)
|
|
: Instruction(Type::VoidTy, UserOp1, &Op, 1, ""),
|
|
Op(VH.Op, this), Cache(VH.Cache) {
|
|
//DEBUG(std::cerr << "VH AQUIRING: " << (void*)V << " " << V);
|
|
}
|
|
|
|
static void RecursiveDelete(ValueMapCache &Cache, Instruction *I) {
|
|
if (!I || !I->use_empty()) return;
|
|
|
|
assert(I->getParent() && "Inst not in basic block!");
|
|
|
|
//DEBUG(std::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 (Op->hasOneUse()) {
|
|
Value *V = Op;
|
|
Op.set(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(std::cerr << "VH RELEASING: " << (void*)Operands[0].get() << " "
|
|
// << Operands[0]->getNumUses() << " " << Operands[0]);
|
|
}
|
|
}
|
|
|