#import <Foundation/Foundation.h>
#include <pthread.h>

/** Max number of frames in the stack trace buffer */
#define kLPThreadStackTraceMaxFramesCount 128

typedef struct LPThreadStackTrace {
  /** The thread that the stacktrace belongs to. */
  pthread_t thread;
  /** Array of addresses in the thread stack. */
  void *stacktrace[kLPThreadStackTraceMaxFramesCount];
  /** Number of valid frames in stacktrace array. */
  int frames;
} LPThreadStackTrace;

/**
 * Generate the stacktrace of all threads in the current process.
 *
 * @param buffer Output. Array of stacktraces.
 * @param size Size of buffer.
 * @return The count of actual threads in the buffer. If the count of threads is more than the size
 * of buffer, it returns the size of buffer and cut off rest of threads.
 */
int LPSnapshotAllThreadsStackTrace(LPThreadStackTrace *buffer, int size);

/**
 * Generate the stacktrace of the thread.
 *
 * @param buffer Output. Array of addresses in the stacktrace.
 * @param size Size of buffer.
 * @param thread The target thread to be snapshotted.
 * @return The count of actual stack frames in the buffer. If the count of stack frames is more than
 * the size of buffer, it returns the size of buffer and cut off rest of frames.
 *
 */
int LPSnapshotThreadStackTrace(void **buffer, int size, pthread_t thread);

/**
 * Symbolicates addresses in a stack trace.
 * Not guaranteed in release mode.
 *
 * @param buffer Array of addresses in the stacktrace.
 * @param size Size of buffer array.
 * @return Array of symbolicated address.
 */
NSArray<NSString *> *LPStackTraceString(void **buffer, int size);

/**
 * Symbolicates a list of stack traces.
 * The parameters should be the output of LPSnapshotAllThreadsStackTrace().
 * Not guaranteed in release mode.
 *
 * @param buffer Array of LPThreadStackTrace.
 * @param size Size of buffer array.
 * @return Array of symbolicated address.
 */
NSArray<NSArray<NSString *> *> *LPStackTracesString(LPThreadStackTrace *buffer, int size);