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121 lines
3.9 KiB
C++
121 lines
3.9 KiB
C++
//===-- Value.cpp - Implement the Value class -----------------------------===//
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//
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// This file implements the Value and User classes.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/InstrTypes.h"
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#include "llvm/SymbolTable.h"
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#include "llvm/DerivedTypes.h"
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#include <algorithm>
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//===----------------------------------------------------------------------===//
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// Value Class
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//===----------------------------------------------------------------------===//
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static inline const Type *checkType(const Type *Ty) {
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assert(Ty && "Value defined with a null type: Error!");
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return Ty;
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}
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Value::Value(const Type *ty, ValueTy vty, const std::string &name = "")
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: Name(name), Ty(checkType(ty), this) {
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VTy = vty;
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}
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Value::~Value() {
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#ifndef NDEBUG // Only in -g mode...
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// Check to make sure that there are no uses of this value that are still
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// around when the value is destroyed. If there are, then we have a dangling
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// reference and something is wrong. This code is here to print out what is
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// still being referenced. The value in question should be printed as
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// a <badref>
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//
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if (Uses.begin() != Uses.end()) {
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std::cerr << "While deleting: " << Ty << "%" << Name << "\n";
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for (use_const_iterator I = Uses.begin(); I != Uses.end(); ++I) {
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std::cerr << "Use still stuck around after Def is destroyed:";
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(*I)->dump();
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std::cerr << "\n";
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}
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}
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#endif
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assert(Uses.begin() == Uses.end());
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}
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void Value::replaceAllUsesWith(Value *D) {
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assert(D && "Value::replaceAllUsesWith(<null>) is invalid!");
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assert(D != this && "V->replaceAllUsesWith(V) is NOT valid!");
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assert(D->getType() == getType() &&
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"replaceAllUses of value with new value of different type!");
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while (!Uses.empty()) {
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User *Use = Uses.back();
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#ifndef NDEBUG
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unsigned NumUses = Uses.size();
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#endif
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Use->replaceUsesOfWith(this, D);
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#ifndef NDEBUG // only in -g mode...
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if (Uses.size() == NumUses) {
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std::cerr << "Use: ";
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Use->dump();
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std::cerr << "replace with: ";
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D->dump();
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}
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#endif
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assert(Uses.size() != NumUses && "Didn't remove definition!");
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}
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}
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// refineAbstractType - This function is implemented because we use
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// potentially abstract types, and these types may be resolved to more
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// concrete types after we are constructed. For the value class, we simply
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// change Ty to point to the right type. :)
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//
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void Value::refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
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assert(Ty.get() == OldTy &&"Can't refine anything but my type!");
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if (OldTy == NewTy && !OldTy->isAbstract())
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Ty.removeUserFromConcrete();
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Ty = NewTy;
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}
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void Value::killUse(User *i) {
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if (i == 0) return;
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use_iterator I = find(Uses.begin(), Uses.end(), i);
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assert(I != Uses.end() && "Use not in uses list!!");
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Uses.erase(I);
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}
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User *Value::use_remove(use_iterator &I) {
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assert(I != Uses.end() && "Trying to remove the end of the use list!!!");
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User *i = *I;
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I = Uses.erase(I);
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return i;
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}
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//===----------------------------------------------------------------------===//
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// User Class
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//===----------------------------------------------------------------------===//
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User::User(const Type *Ty, ValueTy vty, const std::string &name)
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: Value(Ty, vty, name) {
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}
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// replaceUsesOfWith - Replaces all references to the "From" definition with
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// references to the "To" definition.
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//
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void User::replaceUsesOfWith(Value *From, Value *To) {
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if (From == To) return; // Duh what?
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for (unsigned i = 0, E = getNumOperands(); i != E; ++i)
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if (getOperand(i) == From) { // Is This operand is pointing to oldval?
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// The side effects of this setOperand call include linking to
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// "To", adding "this" to the uses list of To, and
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// most importantly, removing "this" from the use list of "From".
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setOperand(i, To); // Fix it now...
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}
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}
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