target_ops: Use bool throughout

After the previous target_ops/C++ patches are all squashed and merged,
this one can go in separately.

This patch adjusts all the target methods to return bool instead of int
when they're returning a boolean.

gdb/ChangeLog:
2018-05-02  Pedro Alves  <palves@redhat.com>

	* target.h (target_ops)
	<stopped_by_sw_breakpoint, supports_stopped_by_sw_breakpoint,
	stopped_by_hw_breakpoint, supports_stopped_by_hw_breakpoint,
	stopped_by_watchpoint, have_continuable_watchpoint,
	stopped_data_address, watchpoint_addr_within_range,
	can_accel_watchpoint_condition, can_run, thread_alive,
	has_all_memory, has_memory, has_stack, has_registers,
	has_execution, can_async_p, is_async_p, supports_non_stop,
	always_non_stop_p, can_execute_reverse, supports_multi_process,
	supports_enable_disable_tracepoint,
	supports_disable_randomization, supports_string_tracing,
	supports_evaluation_of_breakpoint_conditions,
	can_run_breakpoint_commands, filesystem_is_local,
	can_download_tracepoint, get_trace_state_variable_value,
	set_trace_notes, get_tib_address, use_agent, can_use_agent,
	record_is_replaying, record_will_replay,
	augmented_libraries_svr4_read>: Adjust to return bool.
	* aarch64-linux-nat.c: All implementations adjusted.
	* aix-thread.c: All implementations adjusted.
	* arm-linux-nat.c: All implementations adjusted.
	* breakpoint.c: All implementations adjusted.
	* bsd-kvm.c: All implementations adjusted.
	* bsd-uthread.c: All implementations adjusted.
	* corelow.c: All implementations adjusted.
	* ctf.c: All implementations adjusted.
	* darwin-nat.c: All implementations adjusted.
	* darwin-nat.h: All implementations adjusted.
	* exec.c: All implementations adjusted.
	* fbsd-nat.c: All implementations adjusted.
	* fbsd-nat.h: All implementations adjusted.
	* gnu-nat.c: All implementations adjusted.
	* gnu-nat.h: All implementations adjusted.
	* go32-nat.c: All implementations adjusted.
	* ia64-linux-nat.c: All implementations adjusted.
	* inf-child.c: All implementations adjusted.
	* inf-child.h: All implementations adjusted.
	* inf-ptrace.c: All implementations adjusted.
	* inf-ptrace.h: All implementations adjusted.
	* linux-nat.c: All implementations adjusted.
	* linux-nat.h: All implementations adjusted.
	* mips-linux-nat.c: All implementations adjusted.
	* nto-procfs.c: All implementations adjusted.
	* ppc-linux-nat.c: All implementations adjusted.
	* procfs.c: All implementations adjusted.
	* ravenscar-thread.c: All implementations adjusted.
	* record-btrace.c: All implementations adjusted.
	* record-full.c: All implementations adjusted.
	* remote-sim.c: All implementations adjusted.
	* remote.c: All implementations adjusted.
	* s390-linux-nat.c: All implementations adjusted.
	* sol-thread.c: All implementations adjusted.
	* spu-multiarch.c: All implementations adjusted.
	* target-delegates.c: All implementations adjusted.
	* target.c: All implementations adjusted.
	* target.h: All implementations adjusted.
	* tracefile-tfile.c: All implementations adjusted.
	* tracefile.c: All implementations adjusted.
	* tracefile.h: All implementations adjusted.
	* windows-nat.c: All implementations adjusted.
	* x86-linux-nat.h: All implementations adjusted.
	* x86-nat.h: All implementations adjusted.

1 files changed, 9 insertions, 8 deletions

diff --git a/gdb/nto-procfs.c b/gdb/nto-procfs.c
index 1ca4bac3369..f3ba877840a 100644
--- a/gdb/nto-procfs.c
+++ b/gdb/nto-procfs.c
@@ -100,7 +100,7 @@ struct nto_procfs_target : public inf_child_target
   int remove_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
 			 struct expression *) override;
 
-  int stopped_by_watchpoint () override;
+  bool stopped_by_watchpoint () override;
 
   void kill () override;
 
@@ -111,7 +111,7 @@ struct nto_procfs_target : public inf_child_target
 
   void pass_signals (int, unsigned char *) override;
 
-  int thread_alive (ptid_t ptid) override;
+  bool thread_alive (ptid_t ptid) override;
 
   void update_thread_list () override;
 
@@ -297,8 +297,9 @@ procfs_set_thread (ptid_t ptid)
   devctl (ctl_fd, DCMD_PROC_CURTHREAD, &tid, sizeof (tid), 0);
 }
 
-/*  Return nonzero if the thread TH is still alive.  */
-int
+/*  Return true if the thread TH is still alive.  */
+
+bool
 nto_procfs_target::thread_alive (ptid_t ptid)
 {
   pid_t tid;
@@ -310,12 +311,12 @@ nto_procfs_target::thread_alive (ptid_t ptid)
   pid = ptid_get_pid (ptid);
 
   if (kill (pid, 0) == -1)
-    return 0;
+    return false;
 
   status.tid = tid;
   if ((err = devctl (ctl_fd, DCMD_PROC_TIDSTATUS,
 		     &status, sizeof (status), 0)) != EOK)
-    return 0;
+    return false;
 
   /* Thread is alive or dead but not yet joined,
      or dead and there is an alive (or dead unjoined) thread with
@@ -1583,7 +1584,7 @@ procfs_hw_watchpoint (int addr, int len, enum target_hw_bp_type type)
   return 0;
 }
 
-int
+bool
 nto_procfs_target::can_use_hw_breakpoint (enum bptype type,
 					  int cnt, int othertype)
 {
@@ -1606,7 +1607,7 @@ nto_procfs_target::insert_hw_watchpoint (CORE_ADDR addr, int len,
   return procfs_hw_watchpoint (addr, len, type);
 }
 
-int
+bool
 nto_procfs_target::stopped_by_watchpoint ()
 {
   /* NOTE: nto_stopped_by_watchpoint will be called ONLY while we are