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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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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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#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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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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2004-06-26 20:33:39 +00:00
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Value::Value(const Type *ty, unsigned scid, const std::string &name)
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2005-02-05 01:37:58 +00:00
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: SubclassID(scid), SubclassData(0), Ty(checkType(ty)),
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UseList(0), Name(name) {
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2004-07-06 17:44:17 +00:00
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if (!isa<Constant>(this) && !isa<BasicBlock>(this))
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2005-04-21 23:48:37 +00:00
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assert((Ty->isFirstClassType() || Ty == 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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2004-07-25 06:07:15 +00:00
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if (ty == Type::VoidTy)
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2004-07-25 06:16:52 +00:00
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assert(name.empty() && "Cannot have named void values!");
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2001-06-06 20:29:01 +00:00
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}
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Value::~Value() {
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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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2005-02-01 01:24:21 +00:00
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if (use_begin() != use_end()) {
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2006-11-17 08:03:48 +00:00
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DOUT << "While deleting: " << *Ty << " %" << Name << "\n";
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2005-02-01 01:24:21 +00:00
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for (use_iterator I = use_begin(), E = use_end(); I != E; ++I)
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DOUT << "Use still stuck around after Def is destroyed:"
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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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2005-02-01 01:24:21 +00:00
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assert(use_begin() == use_end() && "Uses remain when a value is destroyed!");
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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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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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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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2002-10-09 23:12:59 +00:00
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2005-03-05 19:51:50 +00:00
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void Value::setName(const std::string &name) {
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if (Name == name) return; // Name is already set.
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2005-03-06 02:14:28 +00:00
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// Get the symbol table to update for this object.
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2007-02-05 20:47:22 +00:00
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ValueSymbolTable *ST = 0;
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2005-03-05 19:51:50 +00:00
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if (Instruction *I = dyn_cast<Instruction>(this)) {
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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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2005-03-05 19:51:50 +00:00
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} else if (BasicBlock *BB = dyn_cast<BasicBlock>(this)) {
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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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2005-03-05 19:51:50 +00:00
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} else if (GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
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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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2005-03-05 19:51:50 +00:00
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} else if (Argument *A = dyn_cast<Argument>(this)) {
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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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assert(isa<Constant>(this) && "Unknown value type!");
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return; // no name is setable for this.
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}
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2005-03-06 02:14:28 +00:00
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if (!ST) // No symbol table to update? Just do the change.
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Name = name;
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else if (hasName()) {
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if (!name.empty()) { // Replacing name.
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2007-02-07 06:13:49 +00:00
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ST->remove(this);
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Name = name;
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ST->insert(this);
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2005-03-06 02:14:28 +00:00
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} else { // Transitioning from hasName -> noname.
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ST->remove(this);
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Name.clear();
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}
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} else { // Transitioning from noname -> hasName.
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Name = name;
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ST->insert(this);
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}
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2005-03-05 19:51:50 +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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// except that it doesn't have all of the asserts. The asserts fail because we
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// are half-way done resolving types, which causes some types to exist as two
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// different Type*'s at the same time. This is a sledgehammer to work around
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// this problem.
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//
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void Value::uncheckedReplaceAllUsesWith(Value *New) {
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2005-02-01 01:24:21 +00:00
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while (!use_empty()) {
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Use &U = *UseList;
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2003-08-29 05:09:37 +00:00
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// Must handle Constants specially, we cannot call replaceUsesOfWith on a
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// constant!
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2003-10-16 16:53:07 +00:00
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if (Constant *C = dyn_cast<Constant>(U.getUser())) {
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2004-07-18 00:01:50 +00:00
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if (!isa<GlobalValue>(C))
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2005-10-04 18:13:04 +00:00
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C->replaceUsesOfWithOnConstant(this, New, &U);
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2005-04-21 23:48:37 +00:00
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else
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U.set(New);
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2003-08-29 05:09:37 +00:00
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} else {
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2003-10-16 16:53:07 +00:00
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U.set(New);
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2003-08-29 05:09:37 +00:00
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}
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}
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}
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2003-10-16 16:53:07 +00:00
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void Value::replaceAllUsesWith(Value *New) {
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assert(New && "Value::replaceAllUsesWith(<null>) is invalid!");
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assert(New != this && "this->replaceAllUsesWith(this) is NOT valid!");
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assert(New->getType() == getType() &&
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"replaceAllUses of value with new value of different type!");
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2003-08-29 05:09:37 +00:00
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2003-10-16 16:53:07 +00:00
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uncheckedReplaceAllUsesWith(New);
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2001-06-06 20:29:01 +00:00
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}
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//===----------------------------------------------------------------------===//
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// User Class
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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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2004-07-18 00:01:50 +00:00
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assert(!isa<Constant>(this) || isa<GlobalValue>(this) &&
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2002-10-09 23:12:59 +00:00
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"Cannot call User::replaceUsesofWith on a constant!");
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2001-07-07 08:36:50 +00:00
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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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2001-06-06 20:29:01 +00:00
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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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2001-07-07 08:36:50 +00:00
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setOperand(i, To); // Fix it now...
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2001-06-06 20:29:01 +00:00
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}
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}
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2004-07-18 00:01:50 +00:00
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