mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-12-25 13:08:00 +00:00
118 lines
4.0 KiB
C++
118 lines
4.0 KiB
C++
//===-- Value.cpp - Implement the Value class -----------------------------===//
|
|
//
|
|
// This file implements the Value and User classes.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/InstrTypes.h"
|
|
#include "llvm/SymbolTable.h"
|
|
#include "llvm/DerivedTypes.h"
|
|
#include "Support/LeakDetector.h"
|
|
#include <algorithm>
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Value Class
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
static inline const Type *checkType(const Type *Ty) {
|
|
assert(Ty && "Value defined with a null type: Error!");
|
|
return Ty;
|
|
}
|
|
|
|
Value::Value(const Type *ty, ValueTy vty, const std::string &name)
|
|
: Name(name), Ty(checkType(ty), this) {
|
|
VTy = vty;
|
|
}
|
|
|
|
Value::~Value() {
|
|
#ifndef NDEBUG // Only in -g mode...
|
|
// Check to make sure that there are no uses of this value that are still
|
|
// around when the value is destroyed. If there are, then we have a dangling
|
|
// reference and something is wrong. This code is here to print out what is
|
|
// still being referenced. The value in question should be printed as
|
|
// a <badref>
|
|
//
|
|
if (Uses.begin() != Uses.end()) {
|
|
std::cerr << "While deleting: " << Ty << "%" << Name << "\n";
|
|
for (use_const_iterator I = Uses.begin(); I != Uses.end(); ++I)
|
|
std::cerr << "Use still stuck around after Def is destroyed:"
|
|
<< **I << "\n";
|
|
}
|
|
#endif
|
|
assert(Uses.begin() == Uses.end());
|
|
|
|
// There should be no uses of this object anymore, remove it.
|
|
LeakDetector::removeGarbageObject(this);
|
|
}
|
|
|
|
void Value::replaceAllUsesWith(Value *D) {
|
|
assert(D && "Value::replaceAllUsesWith(<null>) is invalid!");
|
|
assert(D != this && "V->replaceAllUsesWith(V) is NOT valid!");
|
|
assert(D->getType() == getType() &&
|
|
"replaceAllUses of value with new value of different type!");
|
|
while (!Uses.empty()) {
|
|
User *Use = Uses.back();
|
|
#ifndef NDEBUG
|
|
unsigned NumUses = Uses.size();
|
|
#endif
|
|
Use->replaceUsesOfWith(this, D);
|
|
|
|
#ifndef NDEBUG // only in -g mode...
|
|
if (Uses.size() == NumUses)
|
|
std::cerr << "Use: " << *Use << "replace with: " << *D;
|
|
#endif
|
|
assert(Uses.size() != NumUses && "Didn't remove definition!");
|
|
}
|
|
}
|
|
|
|
// refineAbstractType - This function is implemented because we use
|
|
// potentially abstract types, and these types may be resolved to more
|
|
// concrete types after we are constructed. For the value class, we simply
|
|
// change Ty to point to the right type. :)
|
|
//
|
|
void Value::refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
|
|
assert(Ty.get() == OldTy && "Can't refine anything but my type!");
|
|
if (OldTy == NewTy && !OldTy->isAbstract())
|
|
Ty.removeUserFromConcrete();
|
|
Ty = NewTy;
|
|
}
|
|
|
|
void Value::killUse(User *U) {
|
|
if (U == 0) return;
|
|
unsigned i;
|
|
|
|
// Scan backwards through the uses list looking for the user. We do this
|
|
// because vectors like to be accessed on the end. This is incredibly
|
|
// important from a performance perspective.
|
|
for (i = Uses.size()-1; Uses[i] != U; --i)
|
|
/* empty */;
|
|
|
|
assert(i < Uses.size() && "Use not in uses list!!");
|
|
Uses.erase(Uses.begin()+i);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// User Class
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
User::User(const Type *Ty, ValueTy vty, const std::string &name)
|
|
: Value(Ty, vty, name) {
|
|
}
|
|
|
|
// replaceUsesOfWith - Replaces all references to the "From" definition with
|
|
// references to the "To" definition.
|
|
//
|
|
void User::replaceUsesOfWith(Value *From, Value *To) {
|
|
if (From == To) return; // Duh what?
|
|
|
|
for (unsigned i = 0, E = getNumOperands(); i != E; ++i)
|
|
if (getOperand(i) == From) { // Is This operand is pointing to oldval?
|
|
// The side effects of this setOperand call include linking to
|
|
// "To", adding "this" to the uses list of To, and
|
|
// most importantly, removing "this" from the use list of "From".
|
|
setOperand(i, To); // Fix it now...
|
|
}
|
|
}
|
|
|
|
|