gdb/

	Support @entry in input expressions.
	* c-exp.y (ENTRY, unknown_cpp_name): New.
	(exp: UNKNOWN_CPP_NAME): Change to `exp: unknown_cpp_name'.
	(unknown_cpp_name: UNKNOWN_CPP_NAME, unknown_cpp_name: ENTRY)
	(variable: name_not_typename '@' ENTRY, name: ENTRY)
	(name_not_typename: ENTRY): New.
	(yylex): Recognize ENTRY.
	* eval.c (evaluate_subexp_standard): Support also OP_VAR_ENTRY_VALUE.
	* expprint.c (print_subexp_standard, dump_subexp_body_standard):
	Likewise.
	* parse.c (operator_length_standard): Likewise.
	* std-operator.def: New operator OP_VAR_ENTRY_VALUE.

gdb/doc/
	Support @entry in input expressions.
	* gdb.texinfo (Variables): Describe @entry names suffix.
	(Print Settings): Add anchor for `set print entry-values'.

gdb/testsuite/
	Support @entry in input expressions.
	* gdb.arch/amd64-entry-value.exp (entry: p i@entry, entry: p j@entry)
	(entry_stack: p s1@entry, entry_stack: p s2@entry)
	(entry_stack: p d9@entry, entry_stack: p da@entry, tailcall: p i@entry)
	(tailcall: p j@entry): New tests.
	* gdb.cp/koenig.cc (A::entry): New function.
	(main): Call it.
	* gdb.cp/koenig.exp (p entry (c)): New test.

1 files changed, 18 insertions, 0 deletions

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 9de96c1..1ea2ba3 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -7277,6 +7277,23 @@ If you ask to print an object whose contents are unknown to
 by the debug information, @value{GDBN} will say @samp{<incomplete
 type>}.  @xref{Symbols, incomplete type}, for more about this.
 
+If you append @kbd{@@entry} string to a function parameter name you get its
+value at the time the function got called.  If the value is not available an
+error message is printed.  Entry values are available only with some compilers.
+Entry values are normally also printed at the function parameter list according
+to @ref{set print entry-values}.
+
+@smallexample
+Breakpoint 1, d (i=30) at gdb.base/entry-value.c:29
+29	  i++;
+(gdb) next
+30	  e (i);
+(gdb) print i
+$1 = 31
+(gdb) print i@@entry
+$2 = 30
+@end smallexample
+
 Strings are identified as arrays of @code{char} values without specified
 signedness.  Arrays of either @code{signed char} or @code{unsigned char} get
 printed as arrays of 1 byte sized integers.  @code{-fsigned-char} or
@@ -7941,6 +7958,7 @@ thus speeding up the display of each Ada frame.
 @item show print frame-arguments
 Show how the value of arguments should be displayed when printing a frame.
 
+@anchor{set print entry-values}
 @item set print entry-values @var{value}
 @kindex set print entry-values
 Set printing of frame argument values at function entry.  In some cases