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IR: Add COMDATs to the IR

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This new IR facility allows us to represent the object-file semantic of
a COMDAT group.

COMDATs allow us to tie together sections and make the inclusion of one
dependent on another. This is required to implement features like MS
ABI VFTables and optimizing away certain kinds of initialization in C++.

This functionality is only representable in COFF and ELF, Mach-O has no
similar mechanism.

Differential Revision: http://reviews.llvm.org/D4178

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211920 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer
2014-06-27 18:19:56 +00:00
parent 4a295dfbf9
commit c8a1169c93
56 changed files with 1511 additions and 104 deletions
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10
include/llvm/IR/GlobalObject.h
View File

@ -20,7 +20,7 @@
#include "llvm/IR/GlobalValue.h"
namespace llvm {
class Comdat;
class Module;
class GlobalObject : public GlobalValue {
@ -29,11 +29,12 @@ class GlobalObject : public GlobalValue {
protected:
GlobalObject(Type *Ty, ValueTy VTy, Use *Ops, unsigned NumOps,
LinkageTypes Linkage, const Twine &Name)
: GlobalValue(Ty, VTy, Ops, NumOps, Linkage, Name) {
: GlobalValue(Ty, VTy, Ops, NumOps, Linkage, Name), ObjComdat(nullptr) {
setGlobalValueSubClassData(0);
}
std::string Section; // Section to emit this into, empty means default
Comdat *ObjComdat;
public:
unsigned getAlignment() const {
return (1u << getGlobalValueSubClassData()) >> 1;
@ -44,6 +45,11 @@ public:
const char *getSection() const { return Section.c_str(); }
void setSection(StringRef S);
bool hasComdat() const { return getComdat() != nullptr; }
const Comdat *getComdat() const { return ObjComdat; }
Comdat *getComdat() { return ObjComdat; }
void setComdat(Comdat *C) { ObjComdat = C; }
void copyAttributesFrom(const GlobalValue *Src) override;
// Methods for support type inquiry through isa, cast, and dyn_cast: