target_stack -> current_top_target() throughout

The recent C++ification of target_ops replaced references to the old
"current_target" squashed target throughout with references to a
"target_stack" pointer.  I had picked the "target_stack" name very
early in the multi-target work, and managed to stick with it, even
though it's a bit of a misnomer, since it isn't really a "target
stack" object, but a pointer into the current top target in the stack.
As I'm splitting more pieces off of the multi-target branch, I've come
to think that it's better to rename it now.  A following patch will
introduce a new class to represent a target stack, and "target_stack"
would be _its_ ideal name.  (In the branch, the class is called
a_target_stack to work around the clash.)

Thus this commit renames target_stack to current_top_target and
replaces all references throughout.  Also, while at it,
current_top_target is made a function instead of a pointer, to make it
possible to change its internal implementation without leaking
implementation details out.  In a couple patches, the implementation
of the function will change to refer to a target stack object, and
then further down the multi-target work, it'll change again to find
the right target stack for the current inferior.

gdb/ChangeLog:
2018-06-07  Pedro Alves  <palves@redhat.com>

	* target.h (target_stack): Delete.
	(current_top_target): Declare function.
	* target.c (target_stack): Delete.
	(g_current_top_target): New.
	(current_top_target): New function.
	* auxv.c: Use current_top_target instead of target_stack
	throughout.
	* avr-tdep.c: Likewise.
	* breakpoint.c: Likewise.
	* corefile.c: Likewise.
	* elfread.c: Likewise.
	* eval.c: Likewise.
	* exceptions.c: Likewise.
	* frame.c: Likewise.
	* gdbarch-selftests.c: Likewise.
	* gnu-v3-abi.c: Likewise.
	* ia64-tdep.c: Likewise.
	* ia64-vms-tdep.c: Likewise.
	* infcall.c: Likewise.
	* infcmd.c: Likewise.
	* infrun.c: Likewise.
	* linespec.c: Likewise.
	* linux-tdep.c: Likewise.
	* minsyms.c: Likewise.
	* ppc-linux-nat.c: Likewise.
	* ppc-linux-tdep.c: Likewise.
	* procfs.c: Likewise.
	* regcache.c: Likewise.
	* remote.c: Likewise.
	* rs6000-tdep.c: Likewise.
	* s390-linux-nat.c: Likewise.
	* s390-tdep.c: Likewise.
	* solib-aix.c: Likewise.
	* solib-darwin.c: Likewise.
	* solib-dsbt.c: Likewise.
	* solib-spu.c: Likewise.
	* solib-svr4.c: Likewise.
	* solib-target.c: Likewise.
	* sparc-tdep.c: Likewise.
	* sparc64-tdep.c: Likewise.
	* spu-tdep.c: Likewise.
	* symfile.c: Likewise.
	* symtab.c: Likewise.
	* target-descriptions.c: Likewise.
	* target-memory.c: Likewise.
	* target.c: Likewise.
	* target.h: Likewise.
	* tracefile-tfile.c: Likewise.
	* tracepoint.c: Likewise.
	* valops.c: Likewise.
	* valprint.c: Likewise.
	* value.c: Likewise.
	* windows-tdep.c: Likewise.
	* mi/mi-main.c: Likewise.

1 files changed, 3 insertions, 3 deletions

diff --git a/gdb/solib-spu.c b/gdb/solib-spu.c
index a0fe896..8419c2c 100644
--- a/gdb/solib-spu.c
+++ b/gdb/solib-spu.c
@@ -171,7 +171,7 @@ spu_current_sos (void)
     ;
 
   /* Determine list of SPU ids.  */
-  size = target_read (target_stack, TARGET_OBJECT_SPU, NULL,
+  size = target_read (current_top_target (), TARGET_OBJECT_SPU, NULL,
 		      buf, 0, sizeof buf);
 
   /* Do not add stand-alone SPE executable context as shared library,
@@ -206,7 +206,7 @@ spu_current_sos (void)
 	 already created the SPE context, but not installed the object-id
 	 yet.  Skip such entries; we'll be back for them later.  */
       xsnprintf (annex, sizeof annex, "%d/object-id", fd);
-      len = target_read (target_stack, TARGET_OBJECT_SPU, annex,
+      len = target_read (current_top_target (), TARGET_OBJECT_SPU, annex,
 			 (gdb_byte *) id, 0, sizeof id);
       if (len <= 0 || len >= sizeof id)
 	continue;
@@ -418,7 +418,7 @@ spu_enable_break (struct objfile *objfile)
       CORE_ADDR addr = BMSYMBOL_VALUE_ADDRESS (spe_event_sym);
 
       addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (), addr,
-						 target_stack);
+						 current_top_target ());
       create_solib_event_breakpoint (target_gdbarch (), addr);
       return 1;
     }