gdb/

Display @entry parameter values (without references).
	* dwarf2expr.c (dwarf_block_to_fb_offset, dwarf_block_to_sp_offset):
	New functions.
	* dwarf2expr.h (dwarf_block_to_fb_offset, dwarf_block_to_sp_offset):
	New declarations.
	* dwarf2loc.c (dwarf2_find_location_expression): Support location list
	entry record.
	(dwarf_entry_parameter_to_value, value_of_dwarf_reg_entry)
	(value_of_dwarf_block_entry, locexpr_read_variable_at_entry): New
	functions.
	(dwarf2_locexpr_funcs): Install locexpr_read_variable_at_entry.
	(loclist_read_variable_at_entry): New function.
	(dwarf2_loclist_funcs): Install loclist_read_variable_at_entry.
	* dwarf2read.c (read_call_site_scope): Support also DW_OP_fbreg in
	DW_AT_location, call dwarf_block_to_sp_offset for it.
	* frame.h (print_entry_values_no, print_entry_values_only)
	(print_entry_values_preferred, print_entry_values_if_needed)
	(print_entry_values_both, print_entry_values_compact)
	(print_entry_values_default, print_entry_values): New declarations.
	(struct frame_arg): New field entry_kind.
	(read_frame_arg): New parameter entryargp.
	* mi/mi-cmd-stack.c (list_arg_or_local): New gdb_assert for
	arg->entry_kind.  Optionally print the `@entry' suffix.
	(list_args_or_locals): New variable entryarg, initialize it.
	Initialize also entry_kind of arg and entryarg.  Conditionalize
	list_arg_or_local for arg, add list_arg_or_local for entryarg.  Call
	xfree for entryarg.error.
	* stack.c (print_entry_values_no, print_entry_values_only)
	(print_entry_values_preferred, print_entry_values_if_needed)
	(print_entry_values_both, print_entry_values_compact)
	(print_entry_values_default, print_entry_values_choices)
	(print_entry_values): New variables.
	(print_frame_arg): New gdb_assert for arg->entry_kind.  Optionally
	print the `@entry' suffix, possibly in combination for
	print_entry_values_compact.
	(read_frame_arg): New parameter entryargp, new variables entryval,
	entryval_error and val_equal.  Read in also entryargp, respect
	print_entry_values, compare the values using val_equal, fill in also
	argp->entry_kind (together with entryargp->entry_kind).
	(print_frame_args): New variable entryarg, initialize it.
	Conditionalize print_frame_arg for arg, add print_frame_arg for
	entryarg.  Call xfree for entryarg.error.
	(_initialize_stack): Call add_setshow_enum_cmd for `entry-values'.
	* symtab.h (struct symbol_computed_ops): New field
	read_variable_at_entry.

gdb/doc/
	Display @entry parameter values (without references).
	* gdb.texinfo (Tail Call Frames): Add anchor.  Add self tail call
	example.
	(Print Settings): New description of set print entry-values and show
	print entry-values.

gdb/testsuite/
	Display @entry parameter values (without references).
	* gdb.arch/amd64-entry-value.cc (locexpr, stacktest, data, data2)
	(different, validity, invalid): New functions.
	(main): Call them.
	* gdb.arch/amd64-entry-value.exp: New breakpoints breakhere_locexpr,
	stacktest, breakhere_stacktest, different, breakhere_different,
	breakhere_validity and breakhere_invalid.
	(entry: bt): Update for @entry.
	(entry_locexpr: *, entry_stack: *, entry_equal: *, entry_different: *)
	(entry_validity: *, entry_invalid: *): Many new tests.
	* gdb.base/break.exp
	(run until breakpoint set at small function, optimized file): Accept
	also the @entry suffix.
	* gdb.mi/Makefile.in (PROGS): Add mi2-amd64-entry-value.
	* gdb.mi/mi2-amd64-entry-value.c: New files.
	* gdb.mi/mi2-amd64-entry-value.exp: New files.

gdb/dwarf2expr.c

@@ -518,6 +518,68 @@ dwarf_block_to_dwarf_reg (const gdb_byte *buf, const gdb_byte *buf_end)
   return dwarf_reg;
 }
 
+/* If <BUF..BUF_END] contains DW_FORM_block* with single DW_OP_fbreg(X) fill
+   in FB_OFFSET_RETURN with the X offset and return 1.  Otherwise return 0.  */
+
+int
+dwarf_block_to_fb_offset (const gdb_byte *buf, const gdb_byte *buf_end,
+			  CORE_ADDR *fb_offset_return)
+{
+  LONGEST fb_offset;
+
+  if (buf_end <= buf)
+    return 0;
+
+  if (*buf != DW_OP_fbreg)
+    return 0;
+  buf++;
+
+  buf = read_sleb128 (buf, buf_end, &fb_offset);
+  *fb_offset_return = fb_offset;
+  if (buf != buf_end || fb_offset != (LONGEST) *fb_offset_return)
+    return 0;
+
+  return 1;
+}
+
+/* If <BUF..BUF_END] contains DW_FORM_block* with single DW_OP_bregSP(X) fill
+   in SP_OFFSET_RETURN with the X offset and return 1.  Otherwise return 0.
+   The matched SP register number depends on GDBARCH.  */
+
+int
+dwarf_block_to_sp_offset (struct gdbarch *gdbarch, const gdb_byte *buf,
+			  const gdb_byte *buf_end, CORE_ADDR *sp_offset_return)
+{
+  ULONGEST dwarf_reg;
+  LONGEST sp_offset;
+
+  if (buf_end <= buf)
+    return 0;
+  if (*buf >= DW_OP_breg0 && *buf <= DW_OP_breg31)
+    {
+      dwarf_reg = *buf - DW_OP_breg0;
+      buf++;
+    }
+  else
+    {
+      if (*buf != DW_OP_bregx)
+       return 0;
+      buf++;
+      buf = read_uleb128 (buf, buf_end, &dwarf_reg);
+    }
+
+  if (gdbarch_dwarf2_reg_to_regnum (gdbarch, dwarf_reg)
+      != gdbarch_sp_regnum (gdbarch))
+    return 0;
+
+  buf = read_sleb128 (buf, buf_end, &sp_offset);
+  *sp_offset_return = sp_offset;
+  if (buf != buf_end || sp_offset != (LONGEST) *sp_offset_return)
+    return 0;
+
+  return 1;
+}
+
 /* The engine for the expression evaluator.  Using the context in CTX,
    evaluate the expression between OP_PTR and OP_END.  */