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87cd774844
This patch changes GlobalAlias to point to an arbitrary ConstantExpr and it is
up to MC (or the system assembler) to decide if that expression is valid or not.
This reduces our ability to diagnose invalid uses and how early we can spot
them, but it also lets us do things like
@test5 = alias inttoptr(i32 sub (i32 ptrtoint (i32* @test2 to i32),
i32 ptrtoint (i32* @bar to i32)) to i32*)
An important implication of this patch is that the notion of aliased global
doesn't exist any more. The alias has to encode the information needed to
access it in its metadata (linkage, visibility, type, etc).
Another consequence to notice is that getSection has to return a "const char *".
It could return a NullTerminatedStringRef if there was such a thing, but when
that was proposed the decision was to just uses "const char*" for that.
llvm-svn: 210062
111 lines
3.6 KiB
C++
111 lines
3.6 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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GlobalAlias(Type *Ty, unsigned AddressSpace, LinkageTypes Linkage,
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const Twine &Name, Constant *Aliasee, 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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static GlobalAlias *create(Type *Ty, unsigned AddressSpace,
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LinkageTypes Linkage, const Twine &Name,
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Constant *Aliasee, Module *Parent);
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// Without the Aliasee.
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static GlobalAlias *create(Type *Ty, unsigned AddressSpace,
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LinkageTypes Linkage, const Twine &Name,
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Module *Parent);
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// The module is taken from the Aliasee.
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static GlobalAlias *create(Type *Ty, unsigned AddressSpace,
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LinkageTypes Linkage, const Twine &Name,
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GlobalValue *Aliasee);
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// Type, Parent and AddressSpace taken from the Aliasee.
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static GlobalAlias *create(LinkageTypes Linkage, const Twine &Name,
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GlobalValue *Aliasee);
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// Linkage, Type, Parent and AddressSpace taken from the Aliasee.
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static GlobalAlias *create(const Twine &Name, GlobalValue *Aliasee);
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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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/// These methods retrive and set alias target.
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void setAliasee(Constant *Aliasee);
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const Constant *getAliasee() const {
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return const_cast<GlobalAlias *>(this)->getAliasee();
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}
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Constant *getAliasee() {
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return getOperand(0);
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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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