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Add "extern template" declarations now that we use explicit instantiation.

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This is supported by gcc and clang, but guarded by a macro for MSVC 2008.

The extern template declaration is not necessary but generally good
form. It can avoid extra instantiations of the template methods
defined inline.

The EXTERN_TEMPLATE_INSTANTIATION macro could probably be generalized to
handle multiple template parameters if someone thinks it's worthwhile.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158840 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2012-06-20 20:17:20 +00:00
parent 3affd9e8f3
commit 60c7d5bc2c
2 changed files with 23 additions and 1 deletions
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10
include/llvm/Analysis/LoopInfo.h
View File

@ -316,6 +316,11 @@ raw_ostream& operator<<(raw_ostream &OS, const LoopBase<BlockT, LoopT> &Loop) {
return OS;
}
// Implementation in LoopInfoImpl.h
#ifdef __GNUC__
__extension__ extern template class LoopBase<BasicBlock, Loop>;
#endif
class Loop : public LoopBase<BasicBlock, Loop> {
public:
Loop() {}
@ -541,6 +546,11 @@ public:
void print(raw_ostream &OS) const;
};
// Implementation in LoopInfoImpl.h
#ifdef __GNUC__
__extension__ extern template class LoopInfoBase<BasicBlock, Loop>;
#endif
class LoopInfo : public FunctionPass {
LoopInfoBase<BasicBlock, Loop> LI;
friend class LoopBase<BasicBlock, Loop>;

14
include/llvm/CodeGen/MachineLoopInfo.h
View File

@ -7,7 +7,7 @@
//
//===----------------------------------------------------------------------===//
//
// This file defines the MachineLoopInfo class that is used to identify natural
// This file defines the MachineLoopInfo class that is used to identify natural
// loops and determine the loop depth of various nodes of the CFG. Note that
// natural loops may actually be several loops that share the same header node.
//
@ -35,6 +35,12 @@
namespace llvm {
// Implementation in LoopInfoImpl.h
#ifdef __GNUC__
class MachineLoop;
__extension__ extern template class LoopBase<MachineBasicBlock, MachineLoop>;
#endif
class MachineLoop : public LoopBase<MachineBasicBlock, MachineLoop> {
public:
MachineLoop();
@ -57,6 +63,12 @@ private:
: LoopBase<MachineBasicBlock, MachineLoop>(MBB) {}
};
// Implementation in LoopInfoImpl.h
#ifdef __GNUC__
__extension__ extern template
class LoopInfoBase<MachineBasicBlock, MachineLoop>;
#endif
class MachineLoopInfo : public MachineFunctionPass {
LoopInfoBase<MachineBasicBlock, MachineLoop> LI;
friend class LoopBase<MachineBasicBlock, MachineLoop>;