text: /*
   * thread-stack.h: Synthesize a thread's stack using call / return events
   * Copyright (c) 2014, Intel Corporation.
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms and conditions of the GNU General Public License,
   * version 2, as published by the Free Software Foundation.
   *
   * This program is distributed in the hope it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   *
   */
  
  #ifndef __PERF_THREAD_STACK_H
  #define __PERF_THREAD_STACK_H
  
  #include <sys/types.h>
  
  #include <linux/types.h>
  
  struct thread;
  struct comm;
  struct ip_callchain;
  struct symbol;
  struct dso;
  struct comm;
  struct perf_sample;
  struct addr_location;
  struct call_path;
  
  /*
   * Call/Return flags.
   *
   * CALL_RETURN_NO_CALL: 'return' but no matching 'call'
   * CALL_RETURN_NO_RETURN: 'call' but no matching 'return'
   */
  enum {
  	CALL_RETURN_NO_CALL	= 1 << 0,
  	CALL_RETURN_NO_RETURN	= 1 << 1,
  };
  
  /**
   * struct call_return - paired call/return information.
   * @thread: thread in which call/return occurred
   * @comm: comm in which call/return occurred
   * @cp: call path
   * @call_time: timestamp of call (if known)
   * @return_time: timestamp of return (if known)
   * @branch_count: number of branches seen between call and return
   * @call_ref: external reference to 'call' sample (e.g. db_id)
   * @return_ref:  external reference to 'return' sample (e.g. db_id)
   * @db_id: id used for db-export
   * @flags: Call/Return flags
   */
  struct call_return {
  	struct thread *thread;
  	struct comm *comm;
  	struct call_path *cp;
  	u64 call_time;
  	u64 return_time;
  	u64 branch_count;
  	u64 call_ref;
  	u64 return_ref;
  	u64 db_id;
  	u32 flags;
  };
  
  /**
   * struct call_return_processor - provides a call-back to consume call-return
   *                                information.
   * @cpr: call path root
   * @process: call-back that accepts call/return information
   * @data: anonymous data for call-back
   */
  struct call_return_processor {
  	struct call_path_root *cpr;
  	int (*process)(struct call_return *cr, void *data);
  	void *data;
  };
  
  int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip,
  			u64 to_ip, u16 insn_len, u64 trace_nr);
  void thread_stack__set_trace_nr(struct thread *thread, u64 trace_nr);
  void thread_stack__sample(struct thread *thread, struct ip_callchain *chain,
  			  size_t sz, u64 ip);
  int thread_stack__flush(struct thread *thread);
  void thread_stack__free(struct thread *thread);
  size_t thread_stack__depth(struct thread *thread);
  
  struct call_return_processor *
  call_return_processor__new(int (*process)(struct call_return *cr, void *data),
  			   void *data);
  void call_return_processor__free(struct call_return_processor *crp);
  int thread_stack__process(struct thread *thread, struct comm *comm,
  			  struct perf_sample *sample,
  			  struct addr_location *from_al,
  			  struct addr_location *to_al, u64 ref,
  			  struct call_return_processor *crp);
  
  #endif
  