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2d21b25393
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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210062 91177308-0d34-0410-b5e6-96231b3b80d8
59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
//===-- llvm/GlobalObject.h - Class to represent a global object *- 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 represents an independent object. That is, a function or a global
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// variable, but not an alias.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_GLOBALOBJECT_H
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#define LLVM_IR_GLOBALOBJECT_H
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#include "llvm/IR/Constant.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/GlobalValue.h"
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namespace llvm {
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class Module;
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class GlobalObject : public GlobalValue {
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GlobalObject(const GlobalObject &) LLVM_DELETED_FUNCTION;
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protected:
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GlobalObject(Type *Ty, ValueTy VTy, Use *Ops, unsigned NumOps,
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LinkageTypes Linkage, const Twine &Name)
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: GlobalValue(Ty, VTy, Ops, NumOps, Linkage, Name) {
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setGlobalValueSubClassData(0);
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}
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std::string Section; // Section to emit this into, empty means default
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public:
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unsigned getAlignment() const {
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return (1u << getGlobalValueSubClassData()) >> 1;
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}
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void setAlignment(unsigned Align);
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bool hasSection() const { return !StringRef(getSection()).empty(); }
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const char *getSection() const { return Section.c_str(); }
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void setSection(StringRef S);
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void copyAttributesFrom(const GlobalValue *Src) override;
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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::FunctionVal ||
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V->getValueID() == Value::GlobalVariableVal;
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}
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};
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} // End llvm namespace
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#endif
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