-//===-- TransformInternals.cpp - Implement shared functions for transforms --=//
+//===- TransformInternals.cpp - Implement shared functions for transforms -===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This file defines shared functions used by the different components of the
// Transforms library.
#include "TransformInternals.h"
#include "llvm/Type.h"
-#include "llvm/Analysis/Expressions.h"
#include "llvm/Function.h"
-#include "llvm/iOther.h"
-
-// TargetData Hack: Eventually we will have annotations given to us by the
-// backend so that we know stuff about type size and alignments. For now
-// though, just use this, because it happens to match the model that GCC uses.
-//
-const TargetData TD("LevelRaise: Should be GCC though!");
-
+#include "llvm/Instructions.h"
+using namespace llvm;
-static const Type *getStructOffsetStep(const StructType *STy, unsigned &Offset,
- std::vector<Value*> &Indices) {
+static const Type *getStructOffsetStep(const StructType *STy, uint64_t &Offset,
+ std::vector<Value*> &Indices,
+ const TargetData &TD) {
assert(Offset < TD.getTypeSize(STy) && "Offset not in composite!");
const StructLayout *SL = TD.getStructLayout(STy);
for (i = 0; i < SL->MemberOffsets.size()-1; ++i)
if (Offset >= SL->MemberOffsets[i] && Offset < SL->MemberOffsets[i+1])
break;
-
+
assert(Offset >= SL->MemberOffsets[i] &&
(i == SL->MemberOffsets.size()-1 || Offset < SL->MemberOffsets[i+1]));
-
+
// Make sure to save the current index...
- Indices.push_back(ConstantUInt::get(Type::UByteTy, i));
+ Indices.push_back(ConstantUInt::get(Type::UIntTy, i));
Offset = SL->MemberOffsets[i];
return STy->getContainedType(i);
}
// case, this routine will not drill down to the leaf type. Set StopEarly to
// false if you want a leaf
//
-const Type *getStructOffsetType(const Type *Ty, unsigned &Offset,
- std::vector<Value*> &Indices,
- bool StopEarly) {
+const Type *llvm::getStructOffsetType(const Type *Ty, unsigned &Offset,
+ std::vector<Value*> &Indices,
+ const TargetData &TD, bool StopEarly) {
if (Offset == 0 && StopEarly && !Indices.empty())
return Ty; // Return the leaf type
- unsigned ThisOffset;
+ uint64_t ThisOffset;
const Type *NextType;
if (const StructType *STy = dyn_cast<StructType>(Ty)) {
+ if (STy->getNumElements()) {
+ Offset = 0;
+ return STy;
+ }
+
ThisOffset = Offset;
- NextType = getStructOffsetStep(STy, ThisOffset, Indices);
+ NextType = getStructOffsetStep(STy, ThisOffset, Indices, TD);
} else if (const ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
- assert(Offset < TD.getTypeSize(ATy) && "Offset not in composite!");
+ assert(Offset == 0 || Offset < TD.getTypeSize(ATy) &&
+ "Offset not in composite!");
NextType = ATy->getElementType();
- unsigned ChildSize = TD.getTypeSize(NextType);
- Indices.push_back(ConstantSInt::get(Type::LongTy, Offset/ChildSize));
+ unsigned ChildSize = (unsigned)TD.getTypeSize(NextType);
+ if (ConstantSInt::isValueValidForType(Type::IntTy, Offset/ChildSize))
+ Indices.push_back(ConstantSInt::get(Type::IntTy, Offset/ChildSize));
+ else
+ Indices.push_back(ConstantSInt::get(Type::LongTy, Offset/ChildSize));
ThisOffset = (Offset/ChildSize)*ChildSize;
} else {
- Offset = 0; // Return the offset that we were able to acheive
+ Offset = 0; // Return the offset that we were able to achieve
return Ty; // Return the leaf type
}
- unsigned SubOffs = Offset - ThisOffset;
+ unsigned SubOffs = unsigned(Offset - ThisOffset);
const Type *LeafTy = getStructOffsetType(NextType, SubOffs,
- Indices, StopEarly);
- Offset = ThisOffset + SubOffs;
+ Indices, TD, StopEarly);
+ Offset = unsigned(ThisOffset + SubOffs);
return LeafTy;
}
-
-// ConvertableToGEP - This function returns true if the specified value V is
-// a valid index into a pointer of type Ty. If it is valid, Idx is filled in
-// with the values that would be appropriate to make this a getelementptr
-// instruction. The type returned is the root type that the GEP would point to
-//
-const Type *ConvertableToGEP(const Type *Ty, Value *OffsetVal,
- std::vector<Value*> &Indices,
- BasicBlock::iterator *BI) {
- const CompositeType *CompTy = dyn_cast<CompositeType>(Ty);
- if (CompTy == 0) return 0;
-
- // See if the cast is of an integer expression that is either a constant,
- // or a value scaled by some amount with a possible offset.
- //
- ExprType Expr = ClassifyExpression(OffsetVal);
-
- // Get the offset and scale values if they exists...
- // A scale of zero with Expr.Var != 0 means a scale of 1.
- //
- int Offset = Expr.Offset ? getConstantValue(Expr.Offset) : 0;
- int Scale = Expr.Scale ? getConstantValue(Expr.Scale) : 0;
-
- if (Expr.Var && Scale == 0) Scale = 1; // Scale != 0 if Expr.Var != 0
-
- // Loop over the Scale and Offset values, filling in the Indices vector for
- // our final getelementptr instruction.
- //
- const Type *NextTy = CompTy;
- do {
- if (!isa<CompositeType>(NextTy))
- return 0; // Type must not be ready for processing...
- CompTy = cast<CompositeType>(NextTy);
-
- if (const StructType *StructTy = dyn_cast<StructType>(CompTy)) {
- // Step into the appropriate element of the structure...
- unsigned ActualOffset = (Offset < 0) ? 0 : (unsigned)Offset;
- NextTy = getStructOffsetStep(StructTy, ActualOffset, Indices);
- Offset -= ActualOffset;
- } else {
- const Type *ElTy = cast<SequentialType>(CompTy)->getElementType();
- if (!ElTy->isSized())
- return 0; // Type is unreasonable... escape!
- unsigned ElSize = TD.getTypeSize(ElTy);
- int ElSizeS = (int)ElSize;
-
- // See if the user is indexing into a different cell of this array...
- if (Scale && (Scale >= ElSizeS || -Scale >= ElSizeS)) {
- // A scale n*ElSize might occur if we are not stepping through
- // array by one. In this case, we will have to insert math to munge
- // the index.
- //
- int ScaleAmt = Scale/ElSizeS;
- if (Scale-ScaleAmt*ElSizeS)
- return 0; // Didn't scale by a multiple of element size, bail out
- Scale = 0; // Scale is consumed
-
- int Index = Offset/ElSize; // is zero unless Offset > ElSize
- Offset -= Index*ElSize; // Consume part of the offset
-
- if (BI) { // Generate code?
- BasicBlock *BB = (*BI)->getParent();
- if (Expr.Var->getType() != Type::LongTy)
- Expr.Var = new CastInst(Expr.Var, Type::LongTy,
- Expr.Var->getName()+"-idxcast", *BI);
-
- if (ScaleAmt && ScaleAmt != 1) {
- // If we have to scale up our index, do so now
- Value *ScaleAmtVal = ConstantSInt::get(Type::LongTy,
- (unsigned)ScaleAmt);
- Expr.Var = BinaryOperator::create(Instruction::Mul, Expr.Var,
- ScaleAmtVal,
- Expr.Var->getName()+"-scale",*BI);
- }
-
- if (Index) { // Add an offset to the index
- Value *IndexAmt = ConstantSInt::get(Type::LongTy, (unsigned)Index);
- Expr.Var = BinaryOperator::create(Instruction::Add, Expr.Var,
- IndexAmt,
- Expr.Var->getName()+"-offset",
- *BI);
- }
- }
-
- Indices.push_back(Expr.Var);
- Expr.Var = 0;
- } else if (Offset >= (int)ElSize || -Offset >= (int)ElSize) {
- // Calculate the index that we are entering into the array cell with
- unsigned Index = Offset/ElSize;
- Indices.push_back(ConstantSInt::get(Type::LongTy, Index));
- Offset -= (int)(Index*ElSize); // Consume part of the offset
-
- } else if (isa<ArrayType>(CompTy) || Indices.empty()) {
- // Must be indexing a small amount into the first cell of the array
- // Just index into element zero of the array here.
- //
- Indices.push_back(ConstantSInt::get(Type::LongTy, 0));
- } else {
- return 0; // Hrm. wierd, can't handle this case. Bail
- }
- NextTy = ElTy;
- }
- } while (Offset || Scale); // Go until we're done!
-
- return NextTy;
-}
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