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+/* Timing variables for measuring compiler performance.
+   Copyright (C) 2000-2023 Free Software Foundation, Inc.
+   Contributed by Alex Samuel <samuel@codesourcery.com>
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   GCC is distributed in the hope that 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.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_TIMEVAR_H
+#define GCC_TIMEVAR_H
+
+/* Timing variables are used to measure elapsed time in various
+   portions of the compiler.  Each measures elapsed user, system, and
+   wall-clock time, as appropriate to and supported by the host
+   system.
+
+   Timing variables are defined using the DEFTIMEVAR macro in
+   timevar.def.  Each has an enumeral identifier, used when referring
+   to the timing variable in code, and a character string name.
+
+   Timing variables can be used in two ways:
+
+     - On the timing stack, using timevar_push and timevar_pop.
+       Timing variables may be pushed onto the stack; elapsed time is
+       attributed to the topmost timing variable on the stack.  When
+       another variable is pushed on, the previous topmost variable is
+       `paused' until the pushed variable is popped back off.
+
+     - As a standalone timer, using timevar_start and timevar_stop.
+       All time elapsed between the two calls is attributed to the
+       variable.
+*/
+
+/* This structure stores the various varieties of time that can be
+   measured.  Times are stored in seconds.  The time may be an
+   absolute time or a time difference; in the former case, the time
+   base is undefined, except that the difference between two times
+   produces a valid time difference.  */
+
+struct timevar_time_def
+{
+  /* User time in this process.  */
+  double user;
+
+  /* System time (if applicable for this host platform) in this
+     process.  */
+  double sys;
+
+  /* Wall clock time.  */
+  double wall;
+
+  /* Garbage collector memory.  */
+  size_t ggc_mem;
+};
+
+/* An enumeration of timing variable identifiers.  Constructed from
+   the contents of timevar.def.  */
+
+#define DEFTIMEVAR(identifier__, name__) \
+    identifier__,
+typedef enum
+{
+  TV_NONE,
+#include "timevar.def"
+  TIMEVAR_LAST
+}
+timevar_id_t;
+#undef DEFTIMEVAR
+
+/* A class to hold all state relating to timing.  */
+
+class timer;
+
+/* The singleton instance of timing state.
+
+   This is non-NULL if timevars should be used.  In GCC, this happens with
+   the -ftime-report flag.  Hence this is NULL for the common,
+   needs-to-be-fast case, with an early reject happening for this being
+   NULL.  */
+extern timer *g_timer;
+
+/* Total amount of memory allocated by garbage collector.  */
+extern size_t timevar_ggc_mem_total;
+
+extern void timevar_init (void);
+extern void timevar_start (timevar_id_t);
+extern void timevar_stop (timevar_id_t);
+extern bool timevar_cond_start (timevar_id_t);
+extern void timevar_cond_stop (timevar_id_t, bool);
+
+/* The public (within GCC) interface for timing.  */
+
+class timer
+{
+ public:
+  timer ();
+  ~timer ();
+
+  void start (timevar_id_t tv);
+  void stop (timevar_id_t tv);
+  void push (timevar_id_t tv);
+  void pop (timevar_id_t tv);
+  bool cond_start (timevar_id_t tv);
+  void cond_stop (timevar_id_t tv);
+
+  void push_client_item (const char *item_name);
+  void pop_client_item ();
+
+  void print (FILE *fp);
+
+  const char *get_topmost_item_name () const;
+
+ private:
+  /* Private member functions.  */
+  void validate_phases (FILE *fp) const;
+
+  struct timevar_def;
+  void push_internal (struct timevar_def *tv);
+  void pop_internal ();
+  static void print_row (FILE *fp,
+			 const timevar_time_def *total,
+			 const char *name, const timevar_time_def &elapsed);
+  static bool all_zero (const timevar_time_def &elapsed);
+
+ private:
+  typedef hash_map<timevar_def *, timevar_time_def> child_map_t;
+
+  /* Private type: a timing variable.  */
+  struct timevar_def
+  {
+    /* Elapsed time for this variable.  */
+    struct timevar_time_def elapsed;
+
+    /* If this variable is timed independently of the timing stack,
+       using timevar_start, this contains the start time.  */
+    struct timevar_time_def start_time;
+
+    /* The name of this timing variable.  */
+    const char *name;
+
+    /* Nonzero if this timing variable is running as a standalone
+       timer.  */
+    unsigned standalone : 1;
+
+    /* Nonzero if this timing variable was ever started or pushed onto
+       the timing stack.  */
+    unsigned used : 1;
+
+    child_map_t *children;
+  };
+
+  /* Private type: an element on the timing stack
+     Elapsed time is attributed to the topmost timing variable on the
+     stack.  */
+  struct timevar_stack_def
+  {
+    /* The timing variable at this stack level.  */
+    struct timevar_def *timevar;
+
+    /* The next lower timing variable context in the stack.  */
+    struct timevar_stack_def *next;
+  };
+
+  /* A class for managing a collection of named timing items, for use
+     e.g. by libgccjit for timing client code.  This class is declared
+     inside timevar.cc to avoid everything using timevar.h
+     from needing vec and hash_map.  */
+  class named_items;
+
+ private:
+
+  /* Data members (all private).  */
+
+  /* Declared timing variables.  Constructed from the contents of
+     timevar.def.  */
+  timevar_def m_timevars[TIMEVAR_LAST];
+
+  /* The top of the timing stack.  */
+  timevar_stack_def *m_stack;
+
+  /* A list of unused (i.e. allocated and subsequently popped)
+     timevar_stack_def instances.  */
+  timevar_stack_def *m_unused_stack_instances;
+
+  /* The time at which the topmost element on the timing stack was
+     pushed.  Time elapsed since then is attributed to the topmost
+     element.  */
+  timevar_time_def m_start_time;
+
+  /* If non-NULL, for use when timing libgccjit's client code.  */
+  named_items *m_jit_client_items;
+
+  friend class named_items;
+};
+
+/* Provided for backward compatibility.  */
+inline void
+timevar_push (timevar_id_t tv)
+{
+  if (g_timer)
+    g_timer->push (tv);
+}
+
+inline void
+timevar_pop (timevar_id_t tv)
+{
+  if (g_timer)
+    g_timer->pop (tv);
+}
+
+// This is a simple timevar wrapper class that pushes a timevar in its
+// constructor and pops the timevar in its destructor.
+class auto_timevar
+{
+ public:
+  auto_timevar (timer *t, timevar_id_t tv)
+    : m_timer (t),
+      m_tv (tv)
+  {
+    if (m_timer)
+      m_timer->push (m_tv);
+  }
+
+  explicit auto_timevar (timevar_id_t tv)
+    : m_timer (g_timer)
+    , m_tv (tv)
+  {
+    if (m_timer)
+      m_timer->push (m_tv);
+  }
+
+  ~auto_timevar ()
+  {
+    if (m_timer)
+      m_timer->pop (m_tv);
+  }
+
+  // Disallow copies.
+  auto_timevar (const auto_timevar &) = delete;
+
+ private:
+  timer *m_timer;
+  timevar_id_t m_tv;
+};
+
+// As above, but use cond_start/stop.
+class auto_cond_timevar
+{
+ public:
+  auto_cond_timevar (timer *t, timevar_id_t tv)
+    : m_timer (t),
+      m_tv (tv)
+  {
+    start ();
+  }
+
+  explicit auto_cond_timevar (timevar_id_t tv)
+    : m_timer (g_timer)
+    , m_tv (tv)
+  {
+    start ();
+  }
+
+  ~auto_cond_timevar ()
+  {
+    if (m_timer && !already_running)
+      m_timer->cond_stop (m_tv);
+  }
+
+  // Disallow copies.
+  auto_cond_timevar (const auto_cond_timevar &) = delete;
+
+ private:
+  void start()
+  {
+    if (m_timer)
+      already_running = m_timer->cond_start (m_tv);
+    else
+      already_running = false;
+  }
+
+  timer *m_timer;
+  timevar_id_t m_tv;
+  bool already_running;
+};
+
+extern void print_time (const char *, long);
+
+#endif /* ! GCC_TIMEVAR_H */