2001-06-06 20:29:01 +00:00
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//===-- Value.cpp - Implement the Value class -----------------------------===//
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2005-04-21 23:48:37 +00:00
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//
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2003-10-20 19:43:21 +00:00
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// The LLVM Compiler Infrastructure
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//
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2007-12-29 20:36:04 +00:00
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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2005-04-21 23:48:37 +00:00
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//
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2003-10-20 19:43:21 +00:00
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//===----------------------------------------------------------------------===//
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2001-06-06 20:29:01 +00:00
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//
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2005-04-21 23:48:37 +00:00
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// This file implements the Value and User classes.
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2001-06-06 20:29:01 +00:00
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//
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//===----------------------------------------------------------------------===//
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2005-03-05 19:51:50 +00:00
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#include "llvm/Constant.h"
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2008-05-06 22:52:30 +00:00
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#include "llvm/Constants.h"
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2005-03-05 19:51:50 +00:00
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#include "llvm/DerivedTypes.h"
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2001-06-06 20:29:01 +00:00
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#include "llvm/InstrTypes.h"
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2008-02-21 01:54:02 +00:00
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#include "llvm/Instructions.h"
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2005-03-05 19:51:50 +00:00
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#include "llvm/Module.h"
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2007-02-05 20:47:22 +00:00
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#include "llvm/ValueSymbolTable.h"
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2006-11-17 08:03:48 +00:00
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#include "llvm/Support/Debug.h"
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2004-09-01 22:55:40 +00:00
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#include "llvm/Support/LeakDetector.h"
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2001-06-06 20:29:01 +00:00
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#include <algorithm>
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2003-11-21 20:23:48 +00:00
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using namespace llvm;
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2003-11-11 22:41:34 +00:00
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2001-06-06 20:29:01 +00:00
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//===----------------------------------------------------------------------===//
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// Value Class
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//===----------------------------------------------------------------------===//
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2001-12-13 00:41:27 +00:00
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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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2007-02-12 05:18:08 +00:00
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Value::Value(const Type *ty, unsigned scid)
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2008-07-24 00:08:56 +00:00
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: SubclassID(scid), SubclassData(0), VTy(checkType(ty)),
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2008-09-19 15:13:20 +00:00
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UseList(0), Name(0) {
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2008-02-21 02:14:01 +00:00
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if (isa<CallInst>(this) || isa<InvokeInst>(this))
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2008-07-24 00:08:56 +00:00
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assert((VTy->isFirstClassType() || VTy == Type::VoidTy ||
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isa<OpaqueType>(ty) || VTy->getTypeID() == Type::StructTyID) &&
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2008-02-21 01:54:02 +00:00
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"invalid CallInst type!");
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else if (!isa<Constant>(this) && !isa<BasicBlock>(this))
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2008-07-24 00:08:56 +00:00
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assert((VTy->isFirstClassType() || VTy == Type::VoidTy ||
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2004-07-07 18:07:46 +00:00
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isa<OpaqueType>(ty)) &&
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2004-07-06 17:44:17 +00:00
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"Cannot create non-first-class values except for constants!");
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2001-06-06 20:29:01 +00:00
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}
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2007-12-10 02:14:30 +00:00
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Value::~Value() {
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2001-06-06 20:29:01 +00:00
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#ifndef NDEBUG // Only in -g mode...
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2001-06-11 15:04:40 +00:00
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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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2005-04-21 23:48:37 +00:00
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// still being referenced. The value in question should be printed as
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2001-06-11 15:04:40 +00:00
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// a <badref>
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//
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2007-12-10 02:14:30 +00:00
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if (!use_empty()) {
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2008-12-13 18:37:58 +00:00
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cerr << "While deleting: " << *VTy << " %" << getNameStr() << "\n";
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2007-12-10 02:14:30 +00:00
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for (use_iterator I = use_begin(), E = use_end(); I != E; ++I)
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2008-12-13 18:37:58 +00:00
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cerr << "Use still stuck around after Def is destroyed:"
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2006-11-17 08:03:48 +00:00
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<< **I << "\n";
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2001-06-06 20:29:01 +00:00
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}
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#endif
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2007-12-10 02:14:30 +00:00
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assert(use_empty() && "Uses remain when a value is destroyed!");
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2002-09-08 18:59:35 +00:00
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2007-03-20 00:18:10 +00:00
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// If this value is named, destroy the name. This should not be in a symtab
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// at this point.
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2007-12-10 02:14:30 +00:00
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if (Name)
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Name->Destroy();
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2007-03-20 00:18:10 +00:00
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2002-09-08 18:59:35 +00:00
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// There should be no uses of this object anymore, remove it.
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2007-12-10 02:14:30 +00:00
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LeakDetector::removeGarbageObject(this);
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2001-06-06 20:29:01 +00:00
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}
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2005-02-01 01:24:21 +00:00
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/// hasNUses - Return true if this Value has exactly N users.
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///
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bool Value::hasNUses(unsigned N) const {
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use_const_iterator UI = use_begin(), E = use_end();
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for (; N; --N, ++UI)
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if (UI == E) return false; // Too few.
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return UI == E;
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}
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2005-02-23 16:51:11 +00:00
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/// hasNUsesOrMore - Return true if this value has N users or more. This is
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/// logically equivalent to getNumUses() >= N.
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///
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bool Value::hasNUsesOrMore(unsigned N) const {
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use_const_iterator UI = use_begin(), E = use_end();
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for (; N; --N, ++UI)
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if (UI == E) return false; // Too few.
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return true;
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}
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2008-06-12 21:15:59 +00:00
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/// isUsedInBasicBlock - Return true if this value is used in the specified
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/// basic block.
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2008-09-25 22:42:01 +00:00
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bool Value::isUsedInBasicBlock(const BasicBlock *BB) const {
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2008-06-12 21:15:59 +00:00
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for (use_const_iterator I = use_begin(), E = use_end(); I != E; ++I) {
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const Instruction *User = dyn_cast<Instruction>(*I);
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if (User && User->getParent() == BB)
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return true;
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}
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return false;
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}
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2005-02-23 16:51:11 +00:00
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2005-02-01 01:24:21 +00:00
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/// getNumUses - This method computes the number of uses of this Value. This
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/// is a linear time operation. Use hasOneUse or hasNUses to check for specific
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/// values.
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unsigned Value::getNumUses() const {
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return (unsigned)std::distance(use_begin(), use_end());
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}
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2007-02-11 00:37:27 +00:00
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static bool getSymTab(Value *V, ValueSymbolTable *&ST) {
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2007-02-11 19:12:18 +00:00
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ST = 0;
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2007-02-11 00:37:27 +00:00
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if (Instruction *I = dyn_cast<Instruction>(V)) {
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2005-03-05 19:51:50 +00:00
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if (BasicBlock *P = I->getParent())
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if (Function *PP = P->getParent())
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2007-01-06 07:24:44 +00:00
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ST = &PP->getValueSymbolTable();
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2007-02-11 00:37:27 +00:00
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} else if (BasicBlock *BB = dyn_cast<BasicBlock>(V)) {
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2007-02-05 20:47:22 +00:00
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if (Function *P = BB->getParent())
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ST = &P->getValueSymbolTable();
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2007-02-11 00:37:27 +00:00
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} else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
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2007-02-05 20:47:22 +00:00
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if (Module *P = GV->getParent())
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ST = &P->getValueSymbolTable();
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2007-02-11 00:37:27 +00:00
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} else if (Argument *A = dyn_cast<Argument>(V)) {
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2007-02-05 20:47:22 +00:00
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if (Function *P = A->getParent())
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ST = &P->getValueSymbolTable();
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2005-03-05 19:51:50 +00:00
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} else {
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2007-02-11 00:37:27 +00:00
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assert(isa<Constant>(V) && "Unknown value type!");
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return true; // no name is setable for this.
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2005-03-05 19:51:50 +00:00
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}
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2007-02-11 00:37:27 +00:00
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return false;
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}
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2007-08-10 15:34:35 +00:00
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/// getNameStart - Return a pointer to a null terminated string for this name.
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/// Note that names can have null characters within the string as well as at
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/// their end. This always returns a non-null pointer.
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const char *Value::getNameStart() const {
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if (Name == 0) return "";
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return Name->getKeyData();
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}
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/// getNameLen - Return the length of the string, correctly handling nul
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/// characters embedded into them.
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unsigned Value::getNameLen() const {
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2007-09-28 20:09:40 +00:00
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return Name ? Name->getKeyLength() : 0;
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2007-08-10 15:34:35 +00:00
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}
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2008-04-30 03:55:40 +00:00
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/// isName - Return true if this value has the name specified by the provided
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/// nul terminated string.
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bool Value::isName(const char *N) const {
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unsigned InLen = strlen(N);
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2008-04-30 15:27:09 +00:00
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return InLen == getNameLen() && memcmp(getNameStart(), N, InLen) == 0;
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2008-04-30 03:55:40 +00:00
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}
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2007-08-10 15:34:35 +00:00
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2007-02-15 18:53:54 +00:00
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std::string Value::getNameStr() const {
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2007-02-12 05:18:08 +00:00
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if (Name == 0) return "";
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return std::string(Name->getKeyData(),
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Name->getKeyData()+Name->getKeyLength());
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}
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2007-02-11 00:37:27 +00:00
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2007-02-12 05:18:08 +00:00
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void Value::setName(const std::string &name) {
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2007-02-12 18:52:59 +00:00
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setName(&name[0], name.size());
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}
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2007-02-13 07:53:34 +00:00
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void Value::setName(const char *Name) {
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setName(Name, Name ? strlen(Name) : 0);
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}
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2007-02-12 18:52:59 +00:00
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void Value::setName(const char *NameStr, unsigned NameLen) {
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if (NameLen == 0 && !hasName()) return;
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2007-03-05 00:00:42 +00:00
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assert(getType() != Type::VoidTy && "Cannot assign a name to void values!");
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2007-02-12 05:18:08 +00:00
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2007-02-11 00:37:27 +00:00
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// Get the symbol table to update for this object.
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ValueSymbolTable *ST;
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if (getSymTab(this, ST))
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return; // Cannot set a name on this value (e.g. constant).
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2005-03-05 19:51:50 +00:00
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2007-02-12 05:18:08 +00:00
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if (!ST) { // No symbol table to update? Just do the change.
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2007-02-12 18:52:59 +00:00
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if (NameLen == 0) {
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2007-02-12 05:18:08 +00:00
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// Free the name for this value.
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Name->Destroy();
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Name = 0;
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2007-02-12 18:52:59 +00:00
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return;
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2005-03-06 02:14:28 +00:00
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}
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2007-02-12 18:52:59 +00:00
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if (Name) {
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// Name isn't changing?
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if (NameLen == Name->getKeyLength() &&
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!memcmp(Name->getKeyData(), NameStr, NameLen))
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return;
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Name->Destroy();
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}
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// NOTE: Could optimize for the case the name is shrinking to not deallocate
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// then reallocated.
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// Create the new name.
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Name = ValueName::Create(NameStr, NameStr+NameLen);
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Name->setValue(this);
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2007-02-12 05:18:08 +00:00
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return;
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}
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// NOTE: Could optimize for the case the name is shrinking to not deallocate
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// then reallocated.
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if (hasName()) {
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// Name isn't changing?
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2007-02-12 18:52:59 +00:00
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if (NameLen == Name->getKeyLength() &&
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!memcmp(Name->getKeyData(), NameStr, NameLen))
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2007-02-12 05:18:08 +00:00
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return;
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// Remove old name.
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ST->removeValueName(Name);
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Name->Destroy();
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Name = 0;
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2007-02-12 18:52:59 +00:00
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if (NameLen == 0)
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return;
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2005-03-06 02:14:28 +00:00
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}
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2007-02-12 05:18:08 +00:00
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// Name is changing to something new.
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2007-02-12 18:52:59 +00:00
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Name = ST->createValueName(NameStr, NameLen, this);
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2005-03-05 19:51:50 +00:00
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}
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2007-02-12 18:52:59 +00:00
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2007-02-11 00:37:27 +00:00
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/// takeName - transfer the name from V to this value, setting V's name to
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/// empty. It is an error to call V->takeName(V).
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void Value::takeName(Value *V) {
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2007-02-15 20:01:43 +00:00
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ValueSymbolTable *ST = 0;
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// If this value has a name, drop it.
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if (hasName()) {
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// Get the symtab this is in.
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if (getSymTab(this, ST)) {
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// We can't set a name on this value, but we need to clear V's name if
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// it has one.
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if (V->hasName()) V->setName(0, 0);
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return; // Cannot set a name on this value (e.g. constant).
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}
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// Remove old name.
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if (ST)
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ST->removeValueName(Name);
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Name->Destroy();
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Name = 0;
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}
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// Now we know that this has no name.
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// If V has no name either, we're done.
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if (!V->hasName()) return;
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// Get this's symtab if we didn't before.
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if (!ST) {
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if (getSymTab(this, ST)) {
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// Clear V's name.
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V->setName(0, 0);
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return; // Cannot set a name on this value (e.g. constant).
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}
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}
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// Get V's ST, this should always succed, because V has a name.
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ValueSymbolTable *VST;
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bool Failure = getSymTab(V, VST);
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2008-06-21 19:47:03 +00:00
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assert(!Failure && "V has a name, so it should have a ST!"); Failure=Failure;
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2007-02-15 20:01:43 +00:00
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// If these values are both in the same symtab, we can do this very fast.
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// This works even if both values have no symtab yet.
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if (ST == VST) {
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// Take the name!
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Name = V->Name;
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V->Name = 0;
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Name->setValue(this);
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2007-02-11 01:04:09 +00:00
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return;
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}
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2007-02-15 20:01:43 +00:00
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// Otherwise, things are slightly more complex. Remove V's name from VST and
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// then reinsert it into ST.
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if (VST)
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VST->removeValueName(V->Name);
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Name = V->Name;
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V->Name = 0;
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Name->setValue(this);
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if (ST)
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ST->reinsertValue(this);
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2007-02-11 00:37:27 +00:00
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}
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2003-08-29 05:09:37 +00:00
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// uncheckedReplaceAllUsesWith - This is exactly the same as replaceAllUsesWith,
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|
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// except that it doesn't have all of the asserts. The asserts fail because we
|
|
|
|
// are half-way done resolving types, which causes some types to exist as two
|
|
|
|
// different Type*'s at the same time. This is a sledgehammer to work around
|
|
|
|
// this problem.
|
|
|
|
//
|
|
|
|
void Value::uncheckedReplaceAllUsesWith(Value *New) {
|
2005-02-01 01:24:21 +00:00
|
|
|
while (!use_empty()) {
|
2008-09-19 15:13:20 +00:00
|
|
|
Use &U = *UseList;
|
2003-08-29 05:09:37 +00:00
|
|
|
// Must handle Constants specially, we cannot call replaceUsesOfWith on a
|
2007-08-21 00:21:07 +00:00
|
|
|
// constant because they are uniqued.
|
2003-10-16 16:53:07 +00:00
|
|
|
if (Constant *C = dyn_cast<Constant>(U.getUser())) {
|
2007-08-21 00:21:07 +00:00
|
|
|
if (!isa<GlobalValue>(C)) {
|
2005-10-04 18:13:04 +00:00
|
|
|
C->replaceUsesOfWithOnConstant(this, New, &U);
|
2007-08-21 00:21:07 +00:00
|
|
|
continue;
|
|
|
|
}
|
2003-08-29 05:09:37 +00:00
|
|
|
}
|
2007-08-21 00:21:07 +00:00
|
|
|
|
|
|
|
U.set(New);
|
2003-08-29 05:09:37 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2003-10-16 16:53:07 +00:00
|
|
|
void Value::replaceAllUsesWith(Value *New) {
|
|
|
|
assert(New && "Value::replaceAllUsesWith(<null>) is invalid!");
|
|
|
|
assert(New != this && "this->replaceAllUsesWith(this) is NOT valid!");
|
|
|
|
assert(New->getType() == getType() &&
|
|
|
|
"replaceAllUses of value with new value of different type!");
|
2003-08-29 05:09:37 +00:00
|
|
|
|
2003-10-16 16:53:07 +00:00
|
|
|
uncheckedReplaceAllUsesWith(New);
|
2001-06-06 20:29:01 +00:00
|
|
|
}
|
|
|
|
|
2008-05-07 22:54:15 +00:00
|
|
|
Value *Value::stripPointerCasts() {
|
2008-10-01 15:25:41 +00:00
|
|
|
if (!isa<PointerType>(getType()))
|
|
|
|
return this;
|
2008-12-29 21:06:19 +00:00
|
|
|
Value *V = this;
|
|
|
|
do {
|
|
|
|
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
|
|
|
|
if (CE->getOpcode() == Instruction::GetElementPtr) {
|
|
|
|
for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
|
|
|
|
if (!CE->getOperand(i)->isNullValue())
|
|
|
|
return V;
|
|
|
|
V = CE->getOperand(0);
|
|
|
|
} else if (CE->getOpcode() == Instruction::BitCast) {
|
|
|
|
V = CE->getOperand(0);
|
|
|
|
} else {
|
|
|
|
return V;
|
|
|
|
}
|
|
|
|
} else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(V)) {
|
|
|
|
if (!GEP->hasAllZeroIndices())
|
|
|
|
return V;
|
|
|
|
V = GEP->getOperand(0);
|
|
|
|
} else if (BitCastInst *CI = dyn_cast<BitCastInst>(V)) {
|
|
|
|
V = CI->getOperand(0);
|
|
|
|
} else {
|
|
|
|
return V;
|
2008-05-07 22:54:15 +00:00
|
|
|
}
|
2008-12-29 21:06:19 +00:00
|
|
|
assert(isa<PointerType>(V->getType()) && "Unexpected operand type!");
|
|
|
|
} while (1);
|
2008-05-07 22:54:15 +00:00
|
|
|
}
|
|
|
|
|
2008-10-01 15:25:41 +00:00
|
|
|
Value *Value::getUnderlyingObject() {
|
|
|
|
if (!isa<PointerType>(getType()))
|
|
|
|
return this;
|
2008-12-29 21:06:19 +00:00
|
|
|
Value *V = this;
|
|
|
|
do {
|
|
|
|
if (Instruction *I = dyn_cast<Instruction>(V)) {
|
|
|
|
if (!isa<BitCastInst>(I) && !isa<GetElementPtrInst>(I))
|
|
|
|
return V;
|
|
|
|
V = I->getOperand(0);
|
|
|
|
} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
|
|
|
|
if (CE->getOpcode() != Instruction::BitCast &&
|
|
|
|
CE->getOpcode() != Instruction::GetElementPtr)
|
|
|
|
return V;
|
|
|
|
V = CE->getOperand(0);
|
|
|
|
} else {
|
|
|
|
return V;
|
|
|
|
}
|
|
|
|
assert(isa<PointerType>(V->getType()) && "Unexpected operand type!");
|
|
|
|
} while (1);
|
2008-10-01 15:25:41 +00:00
|
|
|
}
|
|
|
|
|
2008-12-02 18:33:11 +00:00
|
|
|
/// DoPHITranslation - If this value is a PHI node with CurBB as its parent,
|
2008-12-02 07:16:45 +00:00
|
|
|
/// return the value in the PHI node corresponding to PredBB. If not, return
|
|
|
|
/// ourself. This is useful if you want to know the value something has in a
|
|
|
|
/// predecessor block.
|
|
|
|
Value *Value::DoPHITranslation(const BasicBlock *CurBB,
|
|
|
|
const BasicBlock *PredBB) {
|
|
|
|
PHINode *PN = dyn_cast<PHINode>(this);
|
|
|
|
if (PN && PN->getParent() == CurBB)
|
|
|
|
return PN->getIncomingValueForBlock(PredBB);
|
|
|
|
return this;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2001-06-06 20:29:01 +00:00
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// User Class
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
|
|
|
// 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?
|
|
|
|
|
2008-02-20 11:08:44 +00:00
|
|
|
assert((!isa<Constant>(this) || isa<GlobalValue>(this)) &&
|
2002-10-09 23:12:59 +00:00
|
|
|
"Cannot call User::replaceUsesofWith on a constant!");
|
|
|
|
|
2001-07-07 08:36:50 +00:00
|
|
|
for (unsigned i = 0, E = getNumOperands(); i != E; ++i)
|
|
|
|
if (getOperand(i) == From) { // Is This operand is pointing to oldval?
|
2001-06-06 20:29:01 +00:00
|
|
|
// 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".
|
2001-07-07 08:36:50 +00:00
|
|
|
setOperand(i, To); // Fix it now...
|
2001-06-06 20:29:01 +00:00
|
|
|
}
|
|
|
|
}
|
2008-05-15 01:23:11 +00:00
|
|
|
|
|
|
|
void *User::operator new(size_t s, unsigned Us) {
|
|
|
|
void *Storage = ::operator new(s + sizeof(Use) * Us);
|
|
|
|
Use *Start = static_cast<Use*>(Storage);
|
|
|
|
Use *End = Start + Us;
|
|
|
|
User *Obj = reinterpret_cast<User*>(End);
|
|
|
|
Obj->OperandList = Start;
|
|
|
|
Obj->NumOperands = Us;
|
|
|
|
Use::initTags(Start, End);
|
|
|
|
return Obj;
|
|
|
|
}
|
|
|
|
|
|
|
|
void User::operator delete(void *Usr) {
|
|
|
|
User *Start = static_cast<User*>(Usr);
|
|
|
|
Use *Storage = static_cast<Use*>(Usr) - Start->NumOperands;
|
|
|
|
::operator delete(Storage == Start->OperandList
|
|
|
|
? Storage
|
|
|
|
: Usr);
|
|
|
|
}
|