2006-01-24 04:13:11 +00:00
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//===-- Globals.cpp - Implement the GlobalValue & GlobalVariable class ----===//
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2005-04-21 23:48:37 +00:00
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//
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2004-07-18 00:06:26 +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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2004-07-18 00:06:26 +00:00
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//===----------------------------------------------------------------------===//
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//
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2013-01-02 09:10:48 +00:00
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// This file implements the GlobalValue & GlobalVariable classes for the IR
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2004-07-18 00:06:26 +00:00
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// library.
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//
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//===----------------------------------------------------------------------===//
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2013-01-02 11:36:10 +00:00
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#include "llvm/IR/GlobalValue.h"
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2012-12-03 16:50:05 +00:00
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#include "llvm/ADT/SmallPtrSet.h"
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2013-01-02 11:36:10 +00:00
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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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2009-07-08 18:01:40 +00:00
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#include "llvm/Support/ErrorHandling.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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2004-07-18 00:06:26 +00:00
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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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2010-01-27 20:34:15 +00:00
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bool GlobalValue::isMaterializable() const {
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2010-02-15 21:27:20 +00:00
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return getParent() && getParent()->isMaterializable(this);
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2010-01-27 20:34:15 +00:00
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}
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bool GlobalValue::isDematerializable() const {
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2010-02-15 21:27:20 +00:00
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return getParent() && getParent()->isDematerializable(this);
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2010-01-27 20:34:15 +00:00
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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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2005-04-21 23:48:37 +00:00
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/// Override destroyConstant to make sure it doesn't get called on
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2004-07-18 00:06:26 +00:00
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/// GlobalValue's because they shouldn't be treated like other constants.
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2009-06-20 00:24:58 +00:00
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void GlobalValue::destroyConstant() {
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2009-07-14 16:55:14 +00:00
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llvm_unreachable("You can't GV->destroyConstant()!");
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2004-07-18 00:06:26 +00:00
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}
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2008-05-26 19:58:59 +00:00
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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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Land the long talked about "type system rewrite" patch. This
patch brings numerous advantages to LLVM. One way to look at it
is through diffstat:
109 files changed, 3005 insertions(+), 5906 deletions(-)
Removing almost 3K lines of code is a good thing. Other advantages
include:
1. Value::getType() is a simple load that can be CSE'd, not a mutating
union-find operation.
2. Types a uniqued and never move once created, defining away PATypeHolder.
3. Structs can be "named" now, and their name is part of the identity that
uniques them. This means that the compiler doesn't merge them structurally
which makes the IR much less confusing.
4. Now that there is no way to get a cycle in a type graph without a named
struct type, "upreferences" go away.
5. Type refinement is completely gone, which should make LTO much MUCH faster
in some common cases with C++ code.
6. Types are now generally immutable, so we can use "Type *" instead
"const Type *" everywhere.
Downsides of this patch are that it removes some functions from the C API,
so people using those will have to upgrade to (not yet added) new API.
"LLVM 3.0" is the right time to do this.
There are still some cleanups pending after this, this patch is large enough
as-is.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134829 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-09 17:41:24 +00:00
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setUnnamedAddr(Src->hasUnnamedAddr());
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2014-02-13 05:11:35 +00:00
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setDLLStorageClass(Src->getDLLStorageClass());
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2008-05-26 19:58:59 +00:00
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}
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2010-07-28 20:56:48 +00:00
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void GlobalValue::setAlignment(unsigned Align) {
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2014-02-13 18:26:41 +00:00
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assert((!isa<GlobalAlias>(this) || !Align) &&
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"GlobalAlias should not have an alignment!");
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2010-07-28 20:56:48 +00:00
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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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2011-07-14 18:10:41 +00:00
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bool GlobalValue::isDeclaration() const {
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2011-07-14 18:12:44 +00:00
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// Globals are definitions if they have an initializer.
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2011-07-14 18:10:41 +00:00
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if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(this))
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return GV->getNumOperands() == 0;
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2011-07-14 18:12:44 +00:00
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// Functions are definitions if they have a body.
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2011-07-14 18:10:41 +00:00
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if (const Function *F = dyn_cast<Function>(this))
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return F->empty();
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2011-07-14 18:12:44 +00:00
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2011-07-14 20:22:18 +00:00
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// Aliases are always definitions.
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assert(isa<GlobalAlias>(this));
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2011-07-14 18:10:41 +00:00
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return false;
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}
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2010-07-28 20:56:48 +00:00
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2004-07-18 00:06:26 +00:00
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//===----------------------------------------------------------------------===//
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// GlobalVariable Implementation
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//===----------------------------------------------------------------------===//
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2012-06-23 11:37:03 +00:00
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GlobalVariable::GlobalVariable(Type *Ty, bool constant, LinkageTypes Link,
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2013-02-03 21:54:38 +00:00
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Constant *InitVal,
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const Twine &Name, ThreadLocalMode TLMode,
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unsigned AddressSpace,
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bool isExternallyInitialized)
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2012-06-23 11:37:03 +00:00
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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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2013-02-03 21:54:38 +00:00
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isConstantGlobal(constant), threadLocalMode(TLMode),
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isExternallyInitializedConstant(isExternallyInitialized) {
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2012-06-23 11:37:03 +00:00
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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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2013-02-03 21:54:38 +00:00
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unsigned AddressSpace,
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bool isExternallyInitialized)
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2012-06-23 12:14:23 +00:00
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: GlobalValue(PointerType::get(Ty, AddressSpace),
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2009-07-08 23:50:31 +00:00
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Value::GlobalVariableVal,
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2008-05-10 08:32:32 +00:00
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OperandTraits<GlobalVariable>::op_begin(this),
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InitVal != 0, Link, Name),
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2013-02-03 21:54:38 +00:00
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isConstantGlobal(constant), threadLocalMode(TLMode),
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isExternallyInitializedConstant(isExternallyInitialized) {
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2006-09-30 21:31:26 +00:00
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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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2008-05-26 21:33:52 +00:00
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Op<0>() = InitVal;
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2006-09-30 21:31:26 +00:00
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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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2009-07-08 19:03:57 +00:00
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else
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M.getGlobalList().push_back(this);
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2006-09-30 21:31:26 +00:00
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}
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2004-07-18 00:06:26 +00:00
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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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2004-10-11 22:21:39 +00:00
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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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2004-07-18 00:06:26 +00:00
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void GlobalVariable::replaceUsesOfWithOnConstant(Value *From, Value *To,
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2005-10-04 18:13:04 +00:00
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Use *U) {
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2004-07-18 00:06:26 +00:00
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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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2005-04-21 23:48:37 +00:00
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assert(getNumOperands() == 1 &&
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2004-07-18 00:06:26 +00:00
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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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2005-04-21 23:48:37 +00:00
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2004-07-18 00:06:26 +00:00
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// Okay, preconditions out of the way, replace the constant initializer.
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2004-08-04 02:27:17 +00:00
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this->setOperand(0, cast<Constant>(To));
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2004-07-18 00:06:26 +00:00
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}
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2007-04-25 14:27:10 +00:00
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2009-11-17 00:43:13 +00:00
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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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2008-05-26 19:58:59 +00:00
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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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2014-02-10 17:13:56 +00:00
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setThreadLocalMode(SrcVar->getThreadLocalMode());
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2008-05-26 19:58:59 +00:00
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}
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2007-04-25 14:27:10 +00:00
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//===----------------------------------------------------------------------===//
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// GlobalAlias Implementation
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//===----------------------------------------------------------------------===//
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2011-07-18 04:54:35 +00:00
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GlobalAlias::GlobalAlias(Type *Ty, LinkageTypes Link,
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2009-07-25 06:02:13 +00:00
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const Twine &Name, Constant* aliasee,
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2007-04-25 14:27:10 +00:00
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Module *ParentModule)
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2008-05-10 08:32:32 +00:00
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: GlobalValue(Ty, Value::GlobalAliasVal, &Op<0>(), 1, Link, Name) {
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2007-04-25 14:27:10 +00:00
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LeakDetector::addGarbageObject(this);
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2007-04-28 13:45:00 +00:00
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if (aliasee)
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assert(aliasee->getType() == Ty && "Alias and aliasee types should match!");
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2008-05-26 21:33:52 +00:00
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Op<0>() = aliasee;
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2007-04-28 13:45:00 +00:00
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2007-04-25 14:27:10 +00:00
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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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2011-07-14 18:01:49 +00:00
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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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2007-04-29 18:02:48 +00:00
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setOperand(0, Aliasee);
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}
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2013-08-19 23:13:33 +00:00
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GlobalValue *GlobalAlias::getAliasedGlobal() {
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Constant *C = getAliasee();
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2011-07-14 18:01:49 +00:00
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if (C == 0) return 0;
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2013-08-19 23:13:33 +00:00
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if (GlobalValue *GV = dyn_cast<GlobalValue>(C))
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2011-07-14 18:01:49 +00:00
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return GV;
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2013-08-19 23:13:33 +00:00
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ConstantExpr *CE = cast<ConstantExpr>(C);
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2014-01-02 20:55:01 +00:00
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assert((CE->getOpcode() == Instruction::BitCast ||
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CE->getOpcode() == Instruction::AddrSpaceCast ||
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2011-07-14 18:01:49 +00:00
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CE->getOpcode() == Instruction::GetElementPtr) &&
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"Unsupported aliasee");
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2011-08-01 12:28:01 +00:00
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return cast<GlobalValue>(CE->getOperand(0));
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2007-04-25 14:27:10 +00:00
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}
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2013-08-19 23:13:33 +00:00
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GlobalValue *GlobalAlias::resolveAliasedGlobal(bool stopOnWeak) {
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SmallPtrSet<GlobalValue*, 3> Visited;
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2008-03-11 22:28:56 +00:00
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2008-09-09 18:23:48 +00:00
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// Check if we need to stop early.
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2009-01-08 20:55:49 +00:00
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if (stopOnWeak && mayBeOverridden())
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2008-09-09 18:23:48 +00:00
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return this;
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2013-08-19 23:13:33 +00:00
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GlobalValue *GV = getAliasedGlobal();
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2008-03-11 22:28:56 +00:00
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Visited.insert(GV);
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2008-09-09 18:23:48 +00:00
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// Iterate over aliasing chain, stopping on weak alias if necessary.
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2013-08-19 23:13:33 +00:00
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while (GlobalAlias *GA = dyn_cast<GlobalAlias>(GV)) {
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2009-01-08 20:55:49 +00:00
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if (stopOnWeak && GA->mayBeOverridden())
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2008-09-09 18:23:48 +00:00
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break;
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2008-03-11 22:28:56 +00:00
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GV = GA->getAliasedGlobal();
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if (!Visited.insert(GV))
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2011-07-14 18:01:49 +00:00
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return 0;
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2008-03-11 22:28:56 +00:00
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}
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return GV;
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}
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