[PATCH v2 43/58] gdbserver: turn fast tracepoint target ops into methods

[Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>]

gdbserver/ChangeLog:
2020-02-10  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>

	Turn process_stratum_target's install_fast_tracepoint_jump_pad
	and get_min_fast_tracepoint_insn_len ops into methods of
	process_target.

	* target.h (struct process_stratum_target): Remove the target ops.
	(class process_target): Add the target ops.  Also add
	'supports_fast_tracepoints'.
	(target_supports_fast_tracepoints): Update the macro.
	(target_get_min_fast_tracepoint_insn_len): Update the macro.
	(install_fast_tracepoint_jump_pad): Update and rename the macro
	to ...
	(target_install_fast_tracepoint_jump_pad): ... this.
	* target.cc (process_target::supports_fast_tracepoints): Define.
	(process_target::install_fast_tracepoint_jump_pad): Define.
	(process_target::get_min_fast_tracepoint_insn_len): Define.

	Update the derived classes and callers below.

	* tracepoint.cc (install_fast_tracepoint): Update.
	* linux-low.cc (linux_target_ops): Update.
	(linux_process_target::supports_fast_tracepoints): Define.
	(linux_install_fast_tracepoint_jump_pad): Turn into ...
	(linux_process_target::install_fast_tracepoint_jump_pad): ... this.
	(linux_get_min_fast_tracepoint_insn_len): Turn into ...
	(linux_process_target::get_min_fast_tracepoint_insn_len): ... this.
	* linux-low.h (class linux_process_target): Update.
	* lynx-low.cc (lynx_target_ops): Update.
	* nto-low.cc (nto_target_ops): Update.
	* win32-low.cc (win32_target_ops): Update.
---
 gdbserver/linux-low.cc  |  33 ++++++------
 gdbserver/linux-low.h   |  18 +++++++
 gdbserver/lynx-low.cc   |   2 -
 gdbserver/nto-low.cc    |   2 -
 gdbserver/target.cc     |  25 ++++++++++
 gdbserver/target.h      | 108 ++++++++++++++++++++--------------------
 gdbserver/tracepoint.cc |  16 ++----
 gdbserver/win32-low.cc  |   2 -
 8 files changed, 117 insertions(+), 89 deletions(-)

diff --git a/gdbserver/linux-low.cc b/gdbserver/linux-low.cc
index aa255cb0f47..f1d61190b12 100644
--- a/gdbserver/linux-low.cc
+++ b/gdbserver/linux-low.cc
@@ -6616,19 +6616,20 @@ linux_process_target::done_accessing_memory ()
     target_unpause_all (true);
 }
 
-static int
-linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr,
-					CORE_ADDR collector,
-					CORE_ADDR lockaddr,
-					ULONGEST orig_size,
-					CORE_ADDR *jump_entry,
-					CORE_ADDR *trampoline,
-					ULONGEST *trampoline_size,
-					unsigned char *jjump_pad_insn,
-					ULONGEST *jjump_pad_insn_size,
-					CORE_ADDR *adjusted_insn_addr,
-					CORE_ADDR *adjusted_insn_addr_end,
-					char *err)
+bool
+linux_process_target::supports_fast_tracepoints ()
+{
+  return true;
+}
+
+int
+linux_process_target::install_fast_tracepoint_jump_pad
+  (CORE_ADDR tpoint, CORE_ADDR tpaddr, CORE_ADDR collector,
+   CORE_ADDR lockaddr, ULONGEST orig_size, CORE_ADDR *jump_entry,
+   CORE_ADDR *trampoline, ULONGEST *trampoline_size,
+   unsigned char *jjump_pad_insn, ULONGEST *jjump_pad_insn_size,
+   CORE_ADDR *adjusted_insn_addr, CORE_ADDR *adjusted_insn_addr_end,
+   char *err)
 {
   return (*the_low_target.install_fast_tracepoint_jump_pad)
     (tpoint, tpaddr, collector, lockaddr, orig_size,
@@ -6647,8 +6648,8 @@ linux_emit_ops (void)
     return NULL;
 }
 
-static int
-linux_get_min_fast_tracepoint_insn_len (void)
+int
+linux_process_target::get_min_fast_tracepoint_insn_len ()
 {
   return (*the_low_target.get_min_fast_tracepoint_insn_len) ();
 }
@@ -7451,10 +7452,8 @@ linux_get_hwcap2 (int wordsize)
 static linux_process_target the_linux_target;
 
 static process_stratum_target linux_target_ops = {
-  linux_install_fast_tracepoint_jump_pad,
   linux_emit_ops,
   linux_supports_disable_randomization,
-  linux_get_min_fast_tracepoint_insn_len,
   linux_qxfer_libraries_svr4,
   linux_supports_agent,
 #ifdef HAVE_LINUX_BTRACE
diff --git a/gdbserver/linux-low.h b/gdbserver/linux-low.h
index d3866de03a2..35e30ed590d 100644
--- a/gdbserver/linux-low.h
+++ b/gdbserver/linux-low.h
@@ -402,6 +402,24 @@ public:
   void unpause_all (bool unfreeze) override;
 
   void stabilize_threads () override;
+
+  bool supports_fast_tracepoints () override;
+
+  int install_fast_tracepoint_jump_pad (CORE_ADDR tpoint,
+					CORE_ADDR tpaddr,
+					CORE_ADDR collector,
+					CORE_ADDR lockaddr,
+					ULONGEST orig_size,
+					CORE_ADDR *jump_entry,
+					CORE_ADDR *trampoline,
+					ULONGEST *trampoline_size,
+					unsigned char *jjump_pad_insn,
+					ULONGEST *jjump_pad_insn_size,
+					CORE_ADDR *adjusted_insn_addr,
+					CORE_ADDR *adjusted_insn_addr_end,
+					char *err) override;
+
+  int get_min_fast_tracepoint_insn_len () override;
 };
 
 #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr)))
diff --git a/gdbserver/lynx-low.cc b/gdbserver/lynx-low.cc
index 5ea50b4415d..4089b261bfd 100644
--- a/gdbserver/lynx-low.cc
+++ b/gdbserver/lynx-low.cc
@@ -735,10 +735,8 @@ static lynx_process_target the_lynx_target;
 /* The LynxOS target_ops vector.  */
 
 static process_stratum_target lynx_target_ops = {
-  NULL,  /* install_fast_tracepoint_jump_pad */
   NULL,  /* emit_ops */
   NULL,  /* supports_disable_randomization */
-  NULL,  /* get_min_fast_tracepoint_insn_len */
   NULL,  /* qxfer_libraries_svr4 */
   NULL,  /* support_agent */
   NULL,  /* enable_btrace */
diff --git a/gdbserver/nto-low.cc b/gdbserver/nto-low.cc
index ef7a70ad97a..e0d3d49bb66 100644
--- a/gdbserver/nto-low.cc
+++ b/gdbserver/nto-low.cc
@@ -947,10 +947,8 @@ nto_sw_breakpoint_from_kind (int kind, int *size)
 static nto_process_target the_nto_target;
 
 static process_stratum_target nto_target_ops = {
-  NULL, /* install_fast_tracepoint_jump_pad */
   NULL, /* emit_ops */
   NULL, /* supports_disable_randomization */
-  NULL, /* get_min_fast_tracepoint_insn_len */
   NULL, /* qxfer_libraries_svr4 */
   NULL, /* support_agent */
   NULL, /* enable_btrace */
diff --git a/gdbserver/target.cc b/gdbserver/target.cc
index 42f22846d02..29b5bbcd9b1 100644
--- a/gdbserver/target.cc
+++ b/gdbserver/target.cc
@@ -668,3 +668,28 @@ process_target::stabilize_threads ()
 {
   /* Nop.  */
 }
+
+bool
+process_target::supports_fast_tracepoints ()
+{
+  return false;
+}
+
+int
+process_target::install_fast_tracepoint_jump_pad
+  (CORE_ADDR tpoint, CORE_ADDR tpaddr, CORE_ADDR collector,
+   CORE_ADDR lockaddr, ULONGEST orig_size, CORE_ADDR *jump_entry,
+   CORE_ADDR *trampoline, ULONGEST *trampoline_size,
+   unsigned char *jjump_pad_insn, ULONGEST *jjump_pad_insn_size,
+   CORE_ADDR *adjusted_insn_addr, CORE_ADDR *adjusted_insn_addr_end,
+   char *err)
+{
+  gdb_assert_not_reached ("target op install_fast_tracepoint_jump_pad "
+			  "not supported");
+}
+
+int
+process_target::get_min_fast_tracepoint_insn_len ()
+{
+  return 0;
+}
diff --git a/gdbserver/target.h b/gdbserver/target.h
index c56267fb1f8..21f22a4d0db 100644
--- a/gdbserver/target.h
+++ b/gdbserver/target.h
@@ -70,34 +70,6 @@ class process_target;
    shared code.  */
 struct process_stratum_target
 {
-  /* Install a fast tracepoint jump pad.  TPOINT is the address of the
-     tracepoint internal object as used by the IPA agent.  TPADDR is
-     the address of tracepoint.  COLLECTOR is address of the function
-     the jump pad redirects to.  LOCKADDR is the address of the jump
-     pad lock object.  ORIG_SIZE is the size in bytes of the
-     instruction at TPADDR.  JUMP_ENTRY points to the address of the
-     jump pad entry, and on return holds the address past the end of
-     the created jump pad.  If a trampoline is created by the function,
-     then TRAMPOLINE and TRAMPOLINE_SIZE return the address and size of
-     the trampoline, else they remain unchanged.  JJUMP_PAD_INSN is a
-     buffer containing a copy of the instruction at TPADDR.
-     ADJUST_INSN_ADDR and ADJUST_INSN_ADDR_END are output parameters that
-     return the address range where the instruction at TPADDR was relocated
-     to.  If an error occurs, the ERR may be used to pass on an error
-     message.  */
-  int (*install_fast_tracepoint_jump_pad) (CORE_ADDR tpoint, CORE_ADDR tpaddr,
-					   CORE_ADDR collector,
-					   CORE_ADDR lockaddr,
-					   ULONGEST orig_size,
-					   CORE_ADDR *jump_entry,
-					   CORE_ADDR *trampoline,
-					   ULONGEST *trampoline_size,
-					   unsigned char *jjump_pad_insn,
-					   ULONGEST *jjump_pad_insn_size,
-					   CORE_ADDR *adjusted_insn_addr,
-					   CORE_ADDR *adjusted_insn_addr_end,
-					   char *err);
-
   /* Return the bytecode operations vector for the current inferior.
      Returns NULL if bytecode compilation is not supported.  */
   struct emit_ops *(*emit_ops) (void);
@@ -105,10 +77,6 @@ struct process_stratum_target
   /* Returns true if the target supports disabling randomization.  */
   int (*supports_disable_randomization) (void);
 
-  /* Return the minimum length of an instruction that can be safely overwritten
-     for use as a fast tracepoint.  */
-  int (*get_min_fast_tracepoint_insn_len) (void);
-
   /* Read solib info on SVR4 platforms.  */
   int (*qxfer_libraries_svr4) (const char *annex, unsigned char *readbuf,
 			       unsigned const char *writebuf,
@@ -494,6 +462,37 @@ public:
 
   /* Stabilize all threads.  That is, force them out of jump pads.  */
   virtual void stabilize_threads ();
+
+  /* Return true if the install_fast_tracepoint_jump_pad op is
+     supported.  */
+  virtual bool supports_fast_tracepoints ();
+
+  /* Install a fast tracepoint jump pad.  TPOINT is the address of the
+     tracepoint internal object as used by the IPA agent.  TPADDR is
+     the address of tracepoint.  COLLECTOR is address of the function
+     the jump pad redirects to.  LOCKADDR is the address of the jump
+     pad lock object.  ORIG_SIZE is the size in bytes of the
+     instruction at TPADDR.  JUMP_ENTRY points to the address of the
+     jump pad entry, and on return holds the address past the end of
+     the created jump pad.  If a trampoline is created by the function,
+     then TRAMPOLINE and TRAMPOLINE_SIZE return the address and size of
+     the trampoline, else they remain unchanged.  JJUMP_PAD_INSN is a
+     buffer containing a copy of the instruction at TPADDR.
+     ADJUST_INSN_ADDR and ADJUST_INSN_ADDR_END are output parameters that
+     return the address range where the instruction at TPADDR was relocated
+     to.  If an error occurs, the ERR may be used to pass on an error
+     message.  */
+  virtual int install_fast_tracepoint_jump_pad
+    (CORE_ADDR tpoint, CORE_ADDR tpaddr, CORE_ADDR collector,
+     CORE_ADDR lockaddr, ULONGEST orig_size, CORE_ADDR *jump_entry,
+     CORE_ADDR *trampoline, ULONGEST *trampoline_size,
+     unsigned char *jjump_pad_insn, ULONGEST *jjump_pad_insn_size,
+     CORE_ADDR *adjusted_insn_addr, CORE_ADDR *adjusted_insn_addr_end,
+     char *err);
+
+  /* Return the minimum length of an instruction that can be safely
+     overwritten for use as a fast tracepoint.  */
+  virtual int get_min_fast_tracepoint_insn_len ();
 };
 
 extern process_stratum_target *the_target;
@@ -559,11 +558,10 @@ int kill_inferior (process_info *proc);
   the_target->pt->supports_tracepoints ()
 
 #define target_supports_fast_tracepoints()		\
-  (the_target->install_fast_tracepoint_jump_pad != NULL)
+  the_target->pt->supports_fast_tracepoints ()
 
 #define target_get_min_fast_tracepoint_insn_len()	\
-  (the_target->get_min_fast_tracepoint_insn_len		\
-   ? (*the_target->get_min_fast_tracepoint_insn_len) () : 0)
+  the_target->pt->get_min_fast_tracepoint_insn_len ()
 
 #define target_thread_stopped(thread) \
   the_target->pt->thread_stopped (thread)
@@ -577,26 +575,26 @@ int kill_inferior (process_info *proc);
 #define target_stabilize_threads()		\
   the_target->pt->stabilize_threads ()
 
-#define install_fast_tracepoint_jump_pad(tpoint, tpaddr,		\
-					 collector, lockaddr,		\
-					 orig_size,			\
-					 jump_entry,			\
-					 trampoline, trampoline_size,	\
-					 jjump_pad_insn,		\
-					 jjump_pad_insn_size,		\
-					 adjusted_insn_addr,		\
-					 adjusted_insn_addr_end,	\
-					 err)				\
-  (*the_target->install_fast_tracepoint_jump_pad) (tpoint, tpaddr,	\
-						   collector,lockaddr,	\
-						   orig_size, jump_entry, \
-						   trampoline,		\
-						   trampoline_size,	\
-						   jjump_pad_insn,	\
-						   jjump_pad_insn_size, \
-						   adjusted_insn_addr,	\
-						   adjusted_insn_addr_end, \
-						   err)
+#define target_install_fast_tracepoint_jump_pad(tpoint, tpaddr,		\
+						collector, lockaddr,	\
+						orig_size,		\
+						jump_entry,		\
+						trampoline, trampoline_size, \
+						jjump_pad_insn,		\
+						jjump_pad_insn_size,	\
+						adjusted_insn_addr,	\
+						adjusted_insn_addr_end,	\
+						err)			\
+  the_target->pt->install_fast_tracepoint_jump_pad (tpoint, tpaddr,	\
+						    collector,lockaddr,	\
+						    orig_size, jump_entry, \
+						    trampoline,		\
+						    trampoline_size,	\
+						    jjump_pad_insn,	\
+						    jjump_pad_insn_size, \
+						    adjusted_insn_addr,	\
+						    adjusted_insn_addr_end, \
+						    err)
 
 #define target_emit_ops() \
   (the_target->emit_ops ? (*the_target->emit_ops) () : NULL)
diff --git a/gdbserver/tracepoint.cc b/gdbserver/tracepoint.cc
index be40c9b4cf1..e587d6561dc 100644
--- a/gdbserver/tracepoint.cc
+++ b/gdbserver/tracepoint.cc
@@ -3117,17 +3117,11 @@ install_fast_tracepoint (struct tracepoint *tpoint, char *errbuf)
   trampoline_size = 0;
 
   /* Install the jump pad.  */
-  err = install_fast_tracepoint_jump_pad (tpoint->obj_addr_on_target,
-					  tpoint->address,
-					  collect,
-					  ipa_sym_addrs.addr_collecting,
-					  tpoint->orig_size,
-					  &jentry,
-					  &trampoline, &trampoline_size,
-					  fjump, &fjump_size,
-					  &tpoint->adjusted_insn_addr,
-					  &tpoint->adjusted_insn_addr_end,
-					  errbuf);
+  err = target_install_fast_tracepoint_jump_pad
+    (tpoint->obj_addr_on_target, tpoint->address, collect,
+     ipa_sym_addrs.addr_collecting, tpoint->orig_size, &jentry,
+     &trampoline, &trampoline_size, fjump, &fjump_size,
+     &tpoint->adjusted_insn_addr, &tpoint->adjusted_insn_addr_end, errbuf);
 
   if (err)
     return 1;
diff --git a/gdbserver/win32-low.cc b/gdbserver/win32-low.cc
index 8e0be15fdaf..9c715fea362 100644
--- a/gdbserver/win32-low.cc
+++ b/gdbserver/win32-low.cc
@@ -1858,10 +1858,8 @@ win32_sw_breakpoint_from_kind (int kind, int *size)
 static win32_process_target the_win32_target;
 
 static process_stratum_target win32_target_ops = {
-  NULL, /* install_fast_tracepoint_jump_pad */
   NULL, /* emit_ops */
   NULL, /* supports_disable_randomization */
-  NULL, /* get_min_fast_tracepoint_insn_len */
   NULL, /* qxfer_libraries_svr4 */
   NULL, /* support_agent */
   NULL, /* enable_btrace */
-- 
2.17.1