mirror of
https://github.com/c64scene-ar/llvm-6502.git
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into their new header subdirectory: include/llvm/IR. This matches the directory structure of lib, and begins to correct a long standing point of file layout clutter in LLVM. There are still more header files to move here, but I wanted to handle them in separate commits to make tracking what files make sense at each layer easier. The only really questionable files here are the target intrinsic tablegen files. But that's a battle I'd rather not fight today. I've updated both CMake and Makefile build systems (I think, and my tests think, but I may have missed something). I've also re-sorted the includes throughout the project. I'll be committing updates to Clang, DragonEgg, and Polly momentarily. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171366 91177308-0d34-0410-b5e6-96231b3b80d8
265 lines
8.6 KiB
C++
265 lines
8.6 KiB
C++
//===-- Globals.cpp - Implement the GlobalValue & GlobalVariable 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 GlobalValue & GlobalVariable classes for the IR
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// library.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/GlobalAlias.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/LeakDetector.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// GlobalValue Class
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//===----------------------------------------------------------------------===//
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bool GlobalValue::isMaterializable() const {
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return getParent() && getParent()->isMaterializable(this);
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}
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bool GlobalValue::isDematerializable() const {
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return getParent() && getParent()->isDematerializable(this);
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}
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bool GlobalValue::Materialize(std::string *ErrInfo) {
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return getParent()->Materialize(this, ErrInfo);
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}
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void GlobalValue::Dematerialize() {
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getParent()->Dematerialize(this);
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}
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/// Override destroyConstant to make sure it doesn't get called on
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/// GlobalValue's because they shouldn't be treated like other constants.
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void GlobalValue::destroyConstant() {
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llvm_unreachable("You can't GV->destroyConstant()!");
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}
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/// copyAttributesFrom - copy all additional attributes (those not needed to
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/// create a GlobalValue) from the GlobalValue Src to this one.
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void GlobalValue::copyAttributesFrom(const GlobalValue *Src) {
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setAlignment(Src->getAlignment());
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setSection(Src->getSection());
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setVisibility(Src->getVisibility());
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setUnnamedAddr(Src->hasUnnamedAddr());
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}
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void GlobalValue::setAlignment(unsigned Align) {
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assert((Align & (Align-1)) == 0 && "Alignment is not a power of 2!");
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assert(Align <= MaximumAlignment &&
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"Alignment is greater than MaximumAlignment!");
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Alignment = Log2_32(Align) + 1;
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assert(getAlignment() == Align && "Alignment representation error!");
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}
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bool GlobalValue::isDeclaration() const {
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// Globals are definitions if they have an initializer.
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if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(this))
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return GV->getNumOperands() == 0;
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// Functions are definitions if they have a body.
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if (const Function *F = dyn_cast<Function>(this))
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return F->empty();
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// Aliases are always definitions.
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assert(isa<GlobalAlias>(this));
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return false;
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}
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//===----------------------------------------------------------------------===//
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// GlobalVariable Implementation
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//===----------------------------------------------------------------------===//
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GlobalVariable::GlobalVariable(Type *Ty, bool constant, LinkageTypes Link,
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Constant *InitVal, const Twine &Name,
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ThreadLocalMode TLMode, unsigned AddressSpace)
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: GlobalValue(PointerType::get(Ty, AddressSpace),
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Value::GlobalVariableVal,
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OperandTraits<GlobalVariable>::op_begin(this),
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InitVal != 0, Link, Name),
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isConstantGlobal(constant), threadLocalMode(TLMode) {
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if (InitVal) {
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assert(InitVal->getType() == Ty &&
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"Initializer should be the same type as the GlobalVariable!");
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Op<0>() = InitVal;
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}
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LeakDetector::addGarbageObject(this);
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}
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GlobalVariable::GlobalVariable(Module &M, Type *Ty, bool constant,
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LinkageTypes Link, Constant *InitVal,
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const Twine &Name,
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GlobalVariable *Before, ThreadLocalMode TLMode,
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unsigned AddressSpace)
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: GlobalValue(PointerType::get(Ty, AddressSpace),
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Value::GlobalVariableVal,
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OperandTraits<GlobalVariable>::op_begin(this),
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InitVal != 0, Link, Name),
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isConstantGlobal(constant), threadLocalMode(TLMode) {
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if (InitVal) {
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assert(InitVal->getType() == Ty &&
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"Initializer should be the same type as the GlobalVariable!");
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Op<0>() = InitVal;
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}
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LeakDetector::addGarbageObject(this);
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if (Before)
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Before->getParent()->getGlobalList().insert(Before, this);
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else
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M.getGlobalList().push_back(this);
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}
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void GlobalVariable::setParent(Module *parent) {
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if (getParent())
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LeakDetector::addGarbageObject(this);
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Parent = parent;
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if (getParent())
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LeakDetector::removeGarbageObject(this);
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}
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void GlobalVariable::removeFromParent() {
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getParent()->getGlobalList().remove(this);
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}
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void GlobalVariable::eraseFromParent() {
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getParent()->getGlobalList().erase(this);
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}
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void GlobalVariable::replaceUsesOfWithOnConstant(Value *From, Value *To,
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Use *U) {
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// If you call this, then you better know this GVar has a constant
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// initializer worth replacing. Enforce that here.
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assert(getNumOperands() == 1 &&
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"Attempt to replace uses of Constants on a GVar with no initializer");
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// And, since you know it has an initializer, the From value better be
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// the initializer :)
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assert(getOperand(0) == From &&
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"Attempt to replace wrong constant initializer in GVar");
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// And, you better have a constant for the replacement value
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assert(isa<Constant>(To) &&
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"Attempt to replace GVar initializer with non-constant");
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// Okay, preconditions out of the way, replace the constant initializer.
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this->setOperand(0, cast<Constant>(To));
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}
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void GlobalVariable::setInitializer(Constant *InitVal) {
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if (InitVal == 0) {
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if (hasInitializer()) {
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Op<0>().set(0);
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NumOperands = 0;
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}
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} else {
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assert(InitVal->getType() == getType()->getElementType() &&
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"Initializer type must match GlobalVariable type");
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if (!hasInitializer())
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NumOperands = 1;
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Op<0>().set(InitVal);
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}
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}
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/// copyAttributesFrom - copy all additional attributes (those not needed to
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/// create a GlobalVariable) from the GlobalVariable Src to this one.
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void GlobalVariable::copyAttributesFrom(const GlobalValue *Src) {
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assert(isa<GlobalVariable>(Src) && "Expected a GlobalVariable!");
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GlobalValue::copyAttributesFrom(Src);
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const GlobalVariable *SrcVar = cast<GlobalVariable>(Src);
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setThreadLocal(SrcVar->isThreadLocal());
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}
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//===----------------------------------------------------------------------===//
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// GlobalAlias Implementation
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//===----------------------------------------------------------------------===//
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GlobalAlias::GlobalAlias(Type *Ty, LinkageTypes Link,
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const Twine &Name, Constant* aliasee,
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Module *ParentModule)
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: GlobalValue(Ty, Value::GlobalAliasVal, &Op<0>(), 1, Link, Name) {
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LeakDetector::addGarbageObject(this);
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if (aliasee)
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assert(aliasee->getType() == Ty && "Alias and aliasee types should match!");
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Op<0>() = aliasee;
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if (ParentModule)
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ParentModule->getAliasList().push_back(this);
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}
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void GlobalAlias::setParent(Module *parent) {
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if (getParent())
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LeakDetector::addGarbageObject(this);
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Parent = parent;
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if (getParent())
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LeakDetector::removeGarbageObject(this);
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}
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void GlobalAlias::removeFromParent() {
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getParent()->getAliasList().remove(this);
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}
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void GlobalAlias::eraseFromParent() {
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getParent()->getAliasList().erase(this);
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}
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void GlobalAlias::setAliasee(Constant *Aliasee) {
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assert((!Aliasee || Aliasee->getType() == getType()) &&
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"Alias and aliasee types should match!");
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setOperand(0, Aliasee);
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}
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const GlobalValue *GlobalAlias::getAliasedGlobal() const {
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const Constant *C = getAliasee();
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if (C == 0) return 0;
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if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
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return GV;
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const ConstantExpr *CE = cast<ConstantExpr>(C);
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assert((CE->getOpcode() == Instruction::BitCast ||
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CE->getOpcode() == Instruction::GetElementPtr) &&
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"Unsupported aliasee");
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return cast<GlobalValue>(CE->getOperand(0));
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}
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const GlobalValue *GlobalAlias::resolveAliasedGlobal(bool stopOnWeak) const {
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SmallPtrSet<const GlobalValue*, 3> Visited;
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// Check if we need to stop early.
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if (stopOnWeak && mayBeOverridden())
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return this;
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const GlobalValue *GV = getAliasedGlobal();
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Visited.insert(GV);
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// Iterate over aliasing chain, stopping on weak alias if necessary.
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while (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV)) {
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if (stopOnWeak && GA->mayBeOverridden())
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break;
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GV = GA->getAliasedGlobal();
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if (!Visited.insert(GV))
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return 0;
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}
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return GV;
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}
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