1/*
2 * Copyright 2012, The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef BCC_ABC_EXPAND_VAARG_PASS_H
18#define BCC_ABC_EXPAND_VAARG_PASS_H
19
20#include <llvm/Pass.h>
21
22namespace llvm {
23  class Function;
24  class Instruction;
25  class LLVMContext;
26  class Value;
27} // end llvm namespace
28
29namespace bcc {
30
31/*
32 * This pass expands va_arg LLVM instruction generated from llvm-ndk-cc.
33 *
34 * LLVM backend does not yet fully support va_arg on many targets. Also,
35 * it does not currently support va_arg with aggregate types on any target.
36 * Therefore, each target should implement its own verion of
37 * ABCExpandVAArg::expandVAArg to expand va_arg.
38 */
39
40class ABCExpandVAArgPass : public llvm::FunctionPass {
41private:
42  static char ID;
43
44protected:
45  llvm::LLVMContext *mContext;
46
47private:
48  virtual llvm::Value *expandVAArg(llvm::Instruction *pInst) = 0;
49
50public:
51  ABCExpandVAArgPass() : llvm::FunctionPass(ID), mContext(NULL) { }
52
53  virtual bool runOnFunction(llvm::Function &pFunc);
54};
55
56} // end bcc namespace
57
58#endif // BCC_ABC_EXPAND_VAARG_PASS_H
59