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https://github.com/c64scene-ar/llvm-6502.git
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27c076ae40
This patch changes the design of GlobalAlias so that it doesn't take a ConstantExpr anymore. It now points directly to a GlobalObject, but its type is independent of the aliasee type. To avoid changing all alias related tests in this patches, I kept the common syntax @foo = alias i32* @bar to mean the same as now. The cases that used to use cast now use the more general syntax @foo = alias i16, i32* @bar. Note that GlobalAlias now behaves a bit more like GlobalVariable. We know that its type is always a pointer, so we omit the '*'. For the bitcode, a nice surprise is that we were writing both identical types already, so the format change is minimal. Auto upgrade is handled by looking through the casts and no new fields are needed for now. New bitcode will simply have different types for Alias and Aliasee. One last interesting point in the patch is that replaceAllUsesWith becomes smart enough to avoid putting a ConstantExpr in the aliasee. This seems better than checking and updating every caller. A followup patch will delete getAliasedGlobal now that it is redundant. Another patch will add support for an explicit offset. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209007 91177308-0d34-0410-b5e6-96231b3b80d8
99 lines
2.9 KiB
C++
99 lines
2.9 KiB
C++
//===-------- llvm/GlobalAlias.h - GlobalAlias class ------------*- C++ -*-===//
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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 contains the declaration of the GlobalAlias class, which
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// represents a single function or variable alias in the IR.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_GLOBALALIAS_H
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#define LLVM_IR_GLOBALALIAS_H
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#include "llvm/ADT/Twine.h"
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#include "llvm/ADT/ilist_node.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/IR/OperandTraits.h"
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namespace llvm {
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class Module;
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template<typename ValueSubClass, typename ItemParentClass>
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class SymbolTableListTraits;
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class GlobalAlias : public GlobalValue, public ilist_node<GlobalAlias> {
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friend class SymbolTableListTraits<GlobalAlias, Module>;
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void operator=(const GlobalAlias &) LLVM_DELETED_FUNCTION;
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GlobalAlias(const GlobalAlias &) LLVM_DELETED_FUNCTION;
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void setParent(Module *parent);
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public:
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// allocate space for exactly one operand
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void *operator new(size_t s) {
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return User::operator new(s, 1);
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}
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/// If a parent module is specified, the alias is automatically inserted into
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/// the end of the specified module's alias list.
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GlobalAlias(Type *Ty, LinkageTypes Linkage, const Twine &Name = "",
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GlobalObject *Aliasee = nullptr, Module *Parent = nullptr,
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unsigned AddressSpace = 0);
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/// Provide fast operand accessors
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DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
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/// removeFromParent - This method unlinks 'this' from the containing module,
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/// but does not delete it.
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///
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void removeFromParent() override;
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/// eraseFromParent - This method unlinks 'this' from the containing module
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/// and deletes it.
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///
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void eraseFromParent() override;
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/// set/getAliasee - These methods retrive and set alias target.
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void setAliasee(GlobalObject *GO);
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const GlobalObject *getAliasee() const {
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return const_cast<GlobalAlias *>(this)->getAliasee();
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}
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GlobalObject *getAliasee() {
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return cast_or_null<GlobalObject>(getOperand(0));
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}
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GlobalObject *getAliasedGlobal() {
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return getAliasee();
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}
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const GlobalObject *getAliasedGlobal() const {
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return const_cast<GlobalAlias *>(this)->getAliasedGlobal();
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}
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static bool isValidLinkage(LinkageTypes L) {
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return isExternalLinkage(L) || isLocalLinkage(L) ||
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isWeakLinkage(L) || isLinkOnceLinkage(L);
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}
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const Value *V) {
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return V->getValueID() == Value::GlobalAliasVal;
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}
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};
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template <>
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struct OperandTraits<GlobalAlias> :
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public FixedNumOperandTraits<GlobalAlias, 1> {
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};
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DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GlobalAlias, Constant)
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} // End llvm namespace
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#endif
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