gdb/

* NEWS: Document inlined function support.
	* Makefile.in (SFILES): Add inline-frame.c.
	(COMMON_OBS): Add inline-frame.o.
	* block.c (contained_in): Rewrite to use lexical nesting.
	(block_linkage_function): Skip inlined function blocks.
	(block_inlined_p): New.
	* block.h (struct block): Update comment.
	(block_inlined_p): New prototype.
	* blockframe.c (get_frame_block): Handle inlined functions.
	(get_frame_function): Do not use block_linkage_function.
	(block_innermost_frame): Use get_frame_block and contained_in.
	* breakpoint.c (watchpoint_check): Remove extra reinit_frame_cache.
	Skip over inlined functions.  Simplify epilogue check.
	(bpstat_check_breakpoint_conditions): Use get_stack_frame_id.
	Update comments.
	(set_momentary_breakpoint): Only accept non-inlined frames.
	(watch_command_1): Use frame_unwind_caller_pc and
	frame_unwind_caller_id instead of get_prev_frame.
	(until_break_command): Likewise.  Use get_stack_frame_id.
	* buildsym.c (end_symtab): Set SYMBOL_SYMTAB for block functions.
	* dwarf2loc.c (dwarf_expr_frame_base): Use block_linkage_function.
	* dwarf2read.c (process_die): Handle DW_TAG_inlined_subroutine.
	(read_func_scope, new_symbol): Likewise.  Handle arguments specially
	for inlined functions without call site information.
	(inherit_abstract_dies): Allow tag mismatch for inlined subroutines.
	(die_specification): Treat DW_AT_abstract_origin as a specification.
	(read_type_die): Handle DW_TAG_inlined_subroutine.
	* frame-unwind.c (frame_unwind_init): Add inline_frame_unwind.
	* frame.c (fprint_frame_id): Print inline depth.
	(fprint_frame_type): Handle INLINE_FRAME and SENTINEL_FRAME.
	(skip_inlined_frames, get_stack_frame_id): New.
	(frame_unwind_caller_id): Use skip_inlined_frames.
	(frame_id_inlined_p): New.
	(frame_id_eq): Make the logic match the comments.  Add inline_depth
	check.
	(frame_id_inner): Handle inlined functions.
	(frame_unwind_pc): New function, copied from frame_unwind_caller_pc.
	(frame_unwind_caller_pc): Use skip_inlined_frames and frame_unwind_pc.
	(get_prev_frame_1): Check for inline frames.  Split out frame
	allocation to get_prev_frame_raw.
	(get_prev_frame_raw): New function.
	(get_prev_frame): Handle inline frames.
	(get_frame_pc): Use frame_unwind_pc.
	(get_frame_address_in_block): Skip inlined frames on both sides.
	(pc_notcurrent): Delete.
	(find_frame_sal): Rewrite to handle inline call sites.  Use
	get_frame_address_in_block.
	(deprecated_update_frame_pc_hack): Make static.
	* frame.h: Update comments.
	(struct frame_id): Add inline_depth.
	(enum frame_type): Add INLINE_FRAME.
	(frame_id_inlined_p, get_stack_frame_id): New prototypes.
	* gdbthread.h (struct thread_info): Add step_stack_frame_id field.
	* infcmd.c (set_step_frame): New function.
	(step_once): Use set_step_frame.  Handle inlined functions.
	(until_next_command): Use set_step_frame.
	(finish_backward), finish_forward): Use get_stack_frame_id.
	(finish_command): Support inlined functions.
	* inferior.h (set_step_info): New prototype.
	* infrun.c (RESUME_ALL): Use minus_one_ptid.
	(clear_proceed_status): Clear step_stack_frame_id.
	(init_wait_for_inferior): Call clear_inline_frame_state.
	(init_execution_control_state): Make static.
	(set_step_info): New function.
	(init_thread_stepping_state): Do not set the symtab or line here.
	(stepped_in_from): New function.
	(handle_inferior_event): Handle inlined functions.  Use set_step_info.
	(insert_step_resume_breakpoint_at_frame): Use get_stack_frame_id.
	(struct inferior_status): Add step_stack_frame_id.
	(save_inferior_status, restore_inferior_status): Save and restore
	step_stack_frame_id.
	* inline-frame.c, inline-frame.h: New files.
	* minsyms.c (prim_record_minimal_symbol_and_info): Use XCALLOC.
	* regcache.c (regcache_write_pc): Call reinit_frame_cache.
	* s390-tdep.c (s390_prologue_frame_unwind_cache): Handle INLINE_FRAME.
	* stack.c (frame_show_address): New.
	(print_frame_info, print_frame): Use it.
	(find_frame_funname): Use get_frame_function.  Handle inlined blocks.
	(frame_info): Mark inlined functions.
	(backtrace_command_1): Use get_current_user_frame.
	(print_frame_local_vars, print_frame_label_vars): Update comments.
	(return_command): Refuse inlined functions.
	* symtab.c (lookup_symbol_aux_local): Stop at inlined function
	boundaries.
	(find_function_start_sal): Avoid inlined functions.
	(completion_list_add_fields): New function.
	(default_make_symbol_completion_list): Use it.  Use block_static_block
	and block_global_block.  Check for inlined functions.
	(skip_prologue_using_sal): Avoid line number comparison across
	inlining.
	* symtab.h (struct symbol): Add is_inlined.
	(SYMBOL_INLINED): New.
	* target.c (target_resume): Call clear_inline_frame_state.
	* valops.c (value_of_variable): Check block_inlined_p.

	gdb/doc/
	* gdb.texinfo (Debugging Optimized Code): New chapter.
	(Compiling for Debugging): Reference it.  Move some
	text to the new section.

	gdb/testsuite/
	* gdb.base/break.exp: Add an XFAIL for gcc/36748.
	* gdb.cp/annota2.exp: Accept frames-invalid in more places.
	* gdb.opt/Makefile.in (EXECUTABLES): Update.
	* gdb.opt/clobbered-registers-O2.exp: Update to GPL v3.
	* gdb.opt/inline-bt.c, gdb.opt/inline-bt.exp,
	gdb.opt/inline-cmds.c, gdb.opt/inline-cmds.exp,
	gdb.opt/inline-locals.c, gdb.opt/inline-locals.exp,
	gdb.opt/inline-markers.c: New files.
	* lib/gdb.exp (skip_inline_frame_tests): New function.
	(skip_inline_var_tests): New function.

gdb/stack.c

@@ -46,6 +46,7 @@
 #include "gdbthread.h"
 #include "cp-support.h"
 #include "disasm.h"
+#include "inline-frame.h"
 
 #include "gdb_assert.h"
 #include <ctype.h>
@@ -99,6 +100,30 @@ print_stack_frame_stub (void *args)
   return 0;
 }
 
+/* Return 1 if we should display the address in addition to the location,
+   because we are in the middle of a statement.  */
+
+static int
+frame_show_address (struct frame_info *frame,
+		    struct symtab_and_line sal)
+{
+  /* If there is a line number, but no PC, then there is no location
+     information associated with this sal.  The only way that should
+     happen is for the call sites of inlined functions (SAL comes from
+     find_frame_sal).  Otherwise, we would have some PC range if the
+     SAL came from a line table.  */
+  if (sal.line != 0 && sal.pc == 0 && sal.end == 0)
+    {
+      if (get_next_frame (frame) == NULL)
+	gdb_assert (inline_skipped_frames (inferior_ptid) > 0);
+      else
+	gdb_assert (get_frame_type (get_next_frame (frame)) == INLINE_FRAME);
+      return 0;
+    }
+
+  return get_frame_pc (frame) != sal.pc;
+}
+
 /* Show or print a stack frame FRAME briefly.  The output is format
    according to PRINT_LEVEL and PRINT_WHAT printing the frame's
    relative level, function name, argument list, and file name and
@@ -565,7 +590,7 @@ print_frame_info (struct frame_info *frame, int print_level,
     {
       int done = 0;
       int mid_statement = ((print_what == SRC_LINE)
-			   && (get_frame_pc (frame) != sal.pc));
+			   && frame_show_address (frame, sal));
 
       if (annotation_level)
 	done = identify_source_line (sal.symtab, sal.line, mid_statement,
@@ -623,7 +648,7 @@ find_frame_funname (struct frame_info *frame, char **funname,
   *funname = NULL;
   *funlang = language_unknown;
 
-  func = find_pc_function (get_frame_address_in_block (frame));
+  func = get_frame_function (frame);
   if (func)
     {
       /* In certain pathological cases, the symtabs give the wrong
@@ -644,8 +669,13 @@ find_frame_funname (struct frame_info *frame, char **funname,
          changed (and we'll create a find_pc_minimal_function or some
          such).  */
 
-      struct minimal_symbol *msymbol =
-	lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame));
+      struct minimal_symbol *msymbol = NULL;
+
+      /* Don't attempt to do this for inlined functions, which do not
+	 have a corresponding minimal symbol.  */
+      if (!block_inlined_p (SYMBOL_BLOCK_VALUE (func)))
+	msymbol
+	  = lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame));
 
       if (msymbol != NULL
 	  && (SYMBOL_VALUE_ADDRESS (msymbol)
@@ -719,7 +749,7 @@ print_frame (struct frame_info *frame, int print_level,
     }
   get_user_print_options (&opts);
   if (opts.addressprint)
-    if (get_frame_pc (frame) != sal.pc || !sal.symtab
+    if (frame_show_address (frame, sal) || !sal.symtab
 	|| print_what == LOC_AND_ADDRESS)
       {
 	annotate_frame_address ();
@@ -1042,8 +1072,10 @@ frame_info (char *addr_exp, int from_tty)
 	printf_filtered (_(" Outermost frame: %s\n"),
 			 frame_stop_reason_string (reason));
     }
-
-  if (calling_frame_info)
+  else if (get_frame_type (fi) == INLINE_FRAME)
+    printf_filtered (" inlined into frame %d",
+		     frame_relative_level (get_prev_frame (fi)));
+  else
     {
       printf_filtered (" called by frame at ");
       fputs_filtered (paddress (get_frame_base (calling_frame_info)),
@@ -1503,7 +1535,9 @@ print_frame_local_vars (struct frame_info *frame, int num_tabs,
       if (print_block_frame_locals (block, frame, num_tabs, stream))
 	values_printed = 1;
       /* After handling the function's top-level block, stop.  Don't
-         continue to its superblock, the block of per-file symbols.  */
+         continue to its superblock, the block of per-file symbols.
+         Also do not continue to the containing function of an inlined
+         function.  */
       if (BLOCK_FUNCTION (block))
 	break;
       block = BLOCK_SUPERBLOCK (block);
@@ -1574,7 +1608,9 @@ print_frame_label_vars (struct frame_info *frame, int this_level_only,
 	return;
 
       /* After handling the function's top-level block, stop.  Don't
-         continue to its superblock, the block of per-file symbols.  */
+         continue to its superblock, the block of per-file symbols.
+         Also do not continue to the containing function of an inlined
+         function.  */
       if (BLOCK_FUNCTION (block))
 	break;
       block = BLOCK_SUPERBLOCK (block);
@@ -1840,6 +1876,9 @@ return_command (char *retval_exp, int from_tty)
   thisfun = get_frame_function (thisframe);
   gdbarch = get_frame_arch (thisframe);
 
+  if (get_frame_type (get_current_frame ()) == INLINE_FRAME)
+    error (_("Can not force return from an inlined function."));
+
   /* Compute the return value.  If the computation triggers an error,
      let it bail.  If the return type can't be handled, set
      RETURN_VALUE to NULL, and QUERY_PREFIX to an informational