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https://github.com/c64scene-ar/llvm-6502.git
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pointer bitcasts and GEP's", and centralize the logic in Value::getUnderlyingObject. The difference with stripPointerCasts is that stripPointerCasts only strips GEPs if all indices are zero, while getUnderlyingObject strips GEPs no matter what the indices are. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56922 91177308-0d34-0410-b5e6-96231b3b80d8
401 lines
13 KiB
C++
401 lines
13 KiB
C++
//===-- Value.cpp - Implement the Value class -----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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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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//
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//===----------------------------------------------------------------------===//
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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/Constant.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/InstrTypes.h"
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#include "llvm/Instructions.h"
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#include "llvm/Module.h"
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#include "llvm/ValueSymbolTable.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/LeakDetector.h"
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#include <algorithm>
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using namespace llvm;
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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, unsigned scid)
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: SubclassID(scid), SubclassData(0), VTy(checkType(ty)),
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UseList(0), Name(0) {
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if (isa<CallInst>(this) || isa<InvokeInst>(this))
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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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"invalid CallInst type!");
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else if (!isa<Constant>(this) && !isa<BasicBlock>(this))
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assert((VTy->isFirstClassType() || VTy == Type::VoidTy ||
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isa<OpaqueType>(ty)) &&
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"Cannot create non-first-class values except for constants!");
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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 (!use_empty()) {
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DOUT << "While deleting: " << *VTy << " %" << getNameStr() << "\n";
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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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}
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#endif
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assert(use_empty() && "Uses remain when a value is destroyed!");
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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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if (Name)
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Name->Destroy();
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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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}
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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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/// 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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/// isUsedInBasicBlock - Return true if this value is used in the specified
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/// basic block.
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bool Value::isUsedInBasicBlock(const BasicBlock *BB) const {
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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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/// 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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static bool getSymTab(Value *V, ValueSymbolTable *&ST) {
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ST = 0;
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if (Instruction *I = dyn_cast<Instruction>(V)) {
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if (BasicBlock *P = I->getParent())
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if (Function *PP = P->getParent())
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ST = &PP->getValueSymbolTable();
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} else if (BasicBlock *BB = dyn_cast<BasicBlock>(V)) {
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if (Function *P = BB->getParent())
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ST = &P->getValueSymbolTable();
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} else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
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if (Module *P = GV->getParent())
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ST = &P->getValueSymbolTable();
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} else if (Argument *A = dyn_cast<Argument>(V)) {
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if (Function *P = A->getParent())
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ST = &P->getValueSymbolTable();
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} else {
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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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}
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return false;
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}
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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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return Name ? Name->getKeyLength() : 0;
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}
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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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return InLen == getNameLen() && memcmp(getNameStart(), N, InLen) == 0;
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}
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std::string Value::getNameStr() const {
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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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void Value::setName(const std::string &name) {
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setName(&name[0], name.size());
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}
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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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void Value::setName(const char *NameStr, unsigned NameLen) {
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if (NameLen == 0 && !hasName()) return;
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assert(getType() != Type::VoidTy && "Cannot assign a name to void values!");
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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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if (!ST) { // No symbol table to update? Just do the change.
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if (NameLen == 0) {
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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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return;
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}
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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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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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if (NameLen == Name->getKeyLength() &&
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!memcmp(Name->getKeyData(), NameStr, NameLen))
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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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if (NameLen == 0)
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return;
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}
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// Name is changing to something new.
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Name = ST->createValueName(NameStr, NameLen, this);
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}
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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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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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assert(!Failure && "V has a name, so it should have a ST!"); Failure=Failure;
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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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return;
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}
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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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}
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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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while (!use_empty()) {
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Use &U = *UseList;
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// Must handle Constants specially, we cannot call replaceUsesOfWith on a
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// constant because they are uniqued.
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if (Constant *C = dyn_cast<Constant>(U.getUser())) {
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if (!isa<GlobalValue>(C)) {
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C->replaceUsesOfWithOnConstant(this, New, &U);
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continue;
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}
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}
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U.set(New);
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}
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}
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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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uncheckedReplaceAllUsesWith(New);
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}
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Value *Value::stripPointerCasts() {
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if (!isa<PointerType>(getType()))
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return this;
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(this)) {
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if (CE->getOpcode() == Instruction::BitCast) {
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return CE->getOperand(0)->stripPointerCasts();
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} else if (CE->getOpcode() == Instruction::GetElementPtr) {
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for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
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if (!CE->getOperand(i)->isNullValue())
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return this;
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return CE->getOperand(0)->stripPointerCasts();
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}
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} else if (BitCastInst *CI = dyn_cast<BitCastInst>(this)) {
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return CI->getOperand(0)->stripPointerCasts();
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} else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(this)) {
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if (GEP->hasAllZeroIndices())
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return GEP->getOperand(0)->stripPointerCasts();
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}
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return this;
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}
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Value *Value::getUnderlyingObject() {
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if (!isa<PointerType>(getType()))
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return this;
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if (Instruction *I = dyn_cast<Instruction>(this)) {
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if (isa<BitCastInst>(I) || isa<GetElementPtrInst>(I))
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return I->getOperand(0)->getUnderlyingObject();
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} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(this)) {
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if (CE->getOpcode() == Instruction::BitCast ||
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CE->getOpcode() == Instruction::GetElementPtr)
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return CE->getOperand(0)->getUnderlyingObject();
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}
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return this;
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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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assert((!isa<Constant>(this) || isa<GlobalValue>(this)) &&
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"Cannot call User::replaceUsesofWith on a constant!");
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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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void *User::operator new(size_t s, unsigned Us) {
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void *Storage = ::operator new(s + sizeof(Use) * Us);
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Use *Start = static_cast<Use*>(Storage);
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Use *End = Start + Us;
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User *Obj = reinterpret_cast<User*>(End);
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Obj->OperandList = Start;
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Obj->NumOperands = Us;
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Use::initTags(Start, End);
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return Obj;
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}
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void User::operator delete(void *Usr) {
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User *Start = static_cast<User*>(Usr);
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Use *Storage = static_cast<Use*>(Usr) - Start->NumOperands;
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::operator delete(Storage == Start->OperandList
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? Storage
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: Usr);
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}
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