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      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 // This file contains portions derived from LLVM, with the original copyright
     18 // header below:
     19 //===-------------- GDBJIT.h - Register debug symbols for JIT -------------===//
     20 //
     21 //                     The LLVM Compiler Infrastructure
     22 //
     23 // This file is distributed under the University of Illinois Open Source
     24 // License. See LICENSE.TXT for details.
     25 //
     26 //===----------------------------------------------------------------------===//
     27 //
     28 // This file defines the data structures used by JIT engines to register object
     29 // files (ideally containing debug info) with GDB.
     30 //
     31 //===----------------------------------------------------------------------===//
     32 
     33 #ifndef BCC_EXECUTION_ENGINE_GDB_JIT_H
     34 #define BCC_EXECUTION_ENGINE_GDB_JIT_H
     35 
     36 #include <llvm/Support/DataTypes.h>
     37 #include <llvm/Support/Compiler.h>
     38 
     39 // This must be kept in sync with gdb/gdb/jit.h .
     40 extern "C" {
     41 
     42   typedef enum {
     43     JIT_NOACTION = 0,
     44     JIT_REGISTER_FN,
     45     JIT_UNREGISTER_FN
     46   } jit_actions_t;
     47 
     48   struct jit_code_entry {
     49     struct jit_code_entry *next_entry;
     50     struct jit_code_entry *prev_entry;
     51     const char *symfile_addr;
     52     uint64_t symfile_size;
     53   };
     54 
     55   struct jit_descriptor {
     56     uint32_t version;
     57     // This should be jit_actions_t, but we want to be specific about the
     58     // bit-width.
     59     uint32_t action_flag;
     60     struct jit_code_entry *relevant_entry;
     61     struct jit_code_entry *first_entry;
     62   };
     63 
     64   // GDB 7.0+ puts a (silent) breakpoint in this function.
     65   LLVM_ATTRIBUTE_NOINLINE void __jit_debug_register_code();
     66 
     67 }
     68 
     69 #endif // BCC_EXECUTION_ENGINE_GDB_JIT_H
     70