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Significantly simplify gep_type_iterator, and make its interface more general/powerful

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11708 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-02-22 06:27:03 +00:00
parent e735b2de30
commit 2425f8c629
1 changed files with 24 additions and 23 deletions
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47
include/llvm/Support/GetElementPtrTypeIterator.h
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@@ -15,8 +15,7 @@
#ifndef LLVM_SUPPORT_GETELEMENTPTRTYPE_H #ifndef LLVM_SUPPORT_GETELEMENTPTRTYPE_H
#define LLVM_SUPPORT_GETELEMENTPTRTYPE_H #define LLVM_SUPPORT_GETELEMENTPTRTYPE_H
#include "Support/iterator" #include "llvm/User.h"
#include "llvm/iMemory.h"
#include "llvm/DerivedTypes.h" #include "llvm/DerivedTypes.h"
namespace llvm { namespace llvm {
@@ -24,30 +23,26 @@ namespace llvm {
: public forward_iterator<const Type *, ptrdiff_t> { : public forward_iterator<const Type *, ptrdiff_t> {
typedef forward_iterator<const Type*, ptrdiff_t> super; typedef forward_iterator<const Type*, ptrdiff_t> super;
User *TheGEP; // Either GetElementPtrInst or ConstantExpr User::op_iterator OpIt;
const Type *CurTy; const Type *CurTy;
unsigned Operand;
gep_type_iterator() {} gep_type_iterator() {}
public: public:
static gep_type_iterator begin(User *gep) { static gep_type_iterator begin(const Type *Ty, User::op_iterator It) {
gep_type_iterator I; gep_type_iterator I;
I.TheGEP = gep; I.CurTy = Ty;
I.CurTy = gep->getOperand(0)->getType(); I.OpIt = It;
I.Operand = 1;
return I; return I;
} }
static gep_type_iterator end(User *gep) { static gep_type_iterator end(User::op_iterator It) {
gep_type_iterator I; gep_type_iterator I;
I.TheGEP = gep;
I.CurTy = 0; I.CurTy = 0;
I.Operand = gep->getNumOperands(); I.OpIt = It;
return I; return I;
} }
bool operator==(const gep_type_iterator& x) const { bool operator==(const gep_type_iterator& x) const {
return Operand == x.Operand; return OpIt == x.OpIt;
} }
bool operator!=(const gep_type_iterator& x) const { bool operator!=(const gep_type_iterator& x) const {
return !operator==(x); return !operator==(x);
@@ -61,9 +56,7 @@ namespace llvm {
// current type directly. // current type directly.
const Type *operator->() const { return operator*(); } const Type *operator->() const { return operator*(); }
unsigned getOperandNum() const { return Operand; } Value *getOperand() const { return *OpIt; }
Value *getOperand() const { return TheGEP->getOperand(Operand); }
gep_type_iterator& operator++() { // Preincrement gep_type_iterator& operator++() { // Preincrement
if (const CompositeType *CT = dyn_cast<CompositeType>(CurTy)) { if (const CompositeType *CT = dyn_cast<CompositeType>(CurTy)) {
@@ -71,7 +64,7 @@ namespace llvm {
} else { } else {
CurTy = 0; CurTy = 0;
} }
++Operand; ++OpIt;
return *this; return *this;
} }
@@ -81,18 +74,26 @@ namespace llvm {
}; };
inline gep_type_iterator gep_type_begin(User *GEP) { inline gep_type_iterator gep_type_begin(User *GEP) {
return gep_type_iterator::begin(GEP); return gep_type_iterator::begin(GEP->getOperand(0)->getType(),
GEP->op_begin()+1);
} }
inline gep_type_iterator gep_type_end(User *GEP) { inline gep_type_iterator gep_type_end(User *GEP) {
return gep_type_iterator::end(GEP); return gep_type_iterator::end(GEP->op_end());
} }
inline gep_type_iterator gep_type_begin(User &GEP) { inline gep_type_iterator gep_type_begin(User &GEP) {
return gep_type_iterator::begin(&GEP); return gep_type_iterator::begin(GEP.getOperand(0)->getType(),
GEP.op_begin()+1);
} }
inline gep_type_iterator gep_type_end(User &GEP) { inline gep_type_iterator gep_type_end(User &GEP) {
return gep_type_iterator::end(&GEP); return gep_type_iterator::end(GEP.op_end());
}
inline gep_type_iterator gep_type_begin(const Type *Op0, User::op_iterator I,
User::op_iterator E) {
return gep_type_iterator::begin(Op0, I);
}
inline gep_type_iterator gep_type_end(const Type *Op0, User::op_iterator I,
User::op_iterator E) {
return gep_type_iterator::end(E);
} }
} // end namespace llvm } // end namespace llvm