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gcc/gcc41-builtin-va-arg-pack-l...

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2007-09-11 Jakub Jelinek <jakub@redhat.com>
* builtins.def (BUILT_IN_VA_ARG_PACK_LEN): New builtin.
* builtins.c (expand_builtin) <case BUILT_IN_VA_ARG_PACK_LEN>: Issue
error if __builtin_va_arg_pack_len () wasn't optimized out during
inlining.
* tree-inline.c (copy_bb): Replace __builtin_va_arg_pack_len ()
with the number of inline's anonymous arguments.
* doc/extend.texi: Document __builtin_va_arg_pack_len ().
* gcc.dg/va-arg-pack-len-1.c: New test.
* g++.dg/va-arg-pack-len-1.C: New test.
--- gcc/builtins.def.jj 2007-09-06 10:19:24.000000000 +0200
+++ gcc/builtins.def 2007-09-14 21:07:41.000000000 +0200
@@ -666,6 +666,7 @@ DEF_GCC_BUILTIN (BUILT_IN_VA_COPY
DEF_GCC_BUILTIN (BUILT_IN_VA_END, "va_end", BT_FN_VOID_VALIST_REF, ATTR_NULL)
DEF_GCC_BUILTIN (BUILT_IN_VA_START, "va_start", BT_FN_VOID_VALIST_REF_VAR, ATTR_NULL)
DEF_GCC_BUILTIN (BUILT_IN_VA_ARG_PACK, "va_arg_pack", BT_FN_INT, ATTR_PURE_NOTHROW_LIST)
+DEF_GCC_BUILTIN (BUILT_IN_VA_ARG_PACK_LEN, "va_arg_pack_len", BT_FN_INT, ATTR_PURE_NOTHROW_LIST)
DEF_EXT_LIB_BUILTIN (BUILT_IN__EXIT, "_exit", BT_FN_VOID_INT, ATTR_NORETURN_NOTHROW_LIST)
DEF_C99_BUILTIN (BUILT_IN__EXIT2, "_Exit", BT_FN_VOID_INT, ATTR_NORETURN_NOTHROW_LIST)
--- gcc/builtins.c.jj 2007-09-06 11:04:56.000000000 +0200
+++ gcc/builtins.c 2007-09-14 21:07:41.000000000 +0200
@@ -5985,6 +5985,12 @@ expand_builtin (tree exp, rtx target, rt
error ("invalid use of %<__builtin_va_arg_pack ()%>");
return const0_rtx;
+ case BUILT_IN_VA_ARG_PACK_LEN:
+ /* All valid uses of __builtin_va_arg_pack_len () are removed during
+ inlining. */
+ error ("invalid use of %<__builtin_va_arg_pack_len ()%>");
+ return const0_rtx;
+
/* Return the address of the first anonymous stack arg. */
case BUILT_IN_NEXT_ARG:
if (fold_builtin_next_arg (arglist))
--- gcc/tree-inline.c.jj 2007-09-06 12:35:57.000000000 +0200
+++ gcc/tree-inline.c 2007-09-14 21:22:48.000000000 +0200
@@ -741,6 +741,37 @@ copy_bb (copy_body_data *id, basic_block
*a = copy_list (arglist);
CALL_EXPR_VA_ARG_PACK (call) = 0;
}
+ else if (call
+ && id->call_expr
+ && (decl = get_callee_fndecl (call))
+ && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
+ && DECL_FUNCTION_CODE (decl)
+ == BUILT_IN_VA_ARG_PACK_LEN)
+ {
+ /* __builtin_va_arg_pack_len () should be replaced by
+ the number of anonymous arguments. */
+ int nargs;
+ tree count, *call_ptr, p, a;
+
+ a = TREE_OPERAND (id->call_expr, 1);
+ for (p = DECL_ARGUMENTS (id->src_fn); p; p = TREE_CHAIN (p))
+ a = TREE_CHAIN (a);
+
+ for (nargs = 0; a; a = TREE_CHAIN (a))
+ nargs++;
+
+ count = build_int_cst (integer_type_node, nargs);
+ call_ptr = &stmt;
+ if (TREE_CODE (*call_ptr) == MODIFY_EXPR)
+ call_ptr = &TREE_OPERAND (*call_ptr, 1);
+ if (TREE_CODE (*call_ptr) == WITH_SIZE_EXPR)
+ call_ptr = &TREE_OPERAND (*call_ptr, 0);
+ gcc_assert (*call_ptr == call && call_ptr != &stmt);
+ *call_ptr = count;
+ update_stmt (stmt);
+ call = NULL_TREE;
+ }
+
/* We're duplicating a CALL_EXPR. Find any corresponding
callgraph edges and update or duplicate them. */
if (call && (decl = get_callee_fndecl (call)))
--- gcc/doc/extend.texi.jj 2007-09-06 10:19:25.000000000 +0200
+++ gcc/doc/extend.texi 2007-09-14 21:07:41.000000000 +0200
@@ -578,6 +578,41 @@ myprintf (FILE *f, const char *format, .
@end smallexample
@end deftypefn
+@deftypefn {Built-in Function} __builtin_va_arg_pack_len ()
+This built-in function returns the number of anonymous arguments of
+an inline function. It can be used only in inline functions which
+will be always inlined, never compiled as a separate function, such
+as those using @code{__attribute__ ((__always_inline__))} or
+@code{__attribute__ ((__gnu_inline__))} extern inline functions.
+For example following will do link or runtime checking of open
+arguments for optimized code:
+@smallexample
+#ifdef __OPTIMIZE__
+extern inline __attribute__((__gnu_inline__)) int
+myopen (const char *path, int oflag, ...)
+@{
+ if (__builtin_va_arg_pack_len () > 1)
+ warn_open_too_many_arguments ();
+
+ if (__builtin_constant_p (oflag))
+ @{
+ if ((oflag & O_CREAT) != 0 && __builtin_va_arg_pack_len () < 1)
+ @{
+ warn_open_missing_mode ();
+ return __open_2 (path, oflag);
+ @}
+ return open (path, oflag, __builtin_va_arg_pack ());
+ @}
+
+ if (__builtin_va_arg_pack_len () < 1)
+ return __open_2 (path, oflag);
+
+ return open (path, oflag, __builtin_va_arg_pack ());
+@}
+#endif
+@end smallexample
+@end deftypefn
+
@node Typeof
@section Referring to a Type with @code{typeof}
@findex typeof
--- gcc/testsuite/gcc.dg/va-arg-pack-len-1.c.jj 2007-09-14 21:07:41.000000000 +0200
+++ gcc/testsuite/gcc.dg/va-arg-pack-len-1.c 2007-09-14 21:07:41.000000000 +0200
@@ -0,0 +1,120 @@
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+#include <stdarg.h>
+
+extern int warn_open_missing_mode (void);
+extern int warn_open_too_many_arguments (void);
+extern void abort (void);
+
+char expected_char;
+
+__attribute__((noinline)) int
+myopen2 (const char *path, int oflag)
+{
+ if (expected_char++ != path[0] || path[1] != '\0')
+ abort ();
+ switch (path[0])
+ {
+ case 'f':
+ if (oflag != 0x2)
+ abort ();
+ break;
+ case 'g':
+ if (oflag != 0x43)
+ abort ();
+ /* In real __open_2 this would terminate the program:
+ open with O_CREAT without third argument. */
+ return -6;
+ default:
+ abort ();
+ }
+ return 0;
+}
+
+__attribute__((noinline)) int
+myopenva (const char *path, int oflag, ...)
+{
+ int mode = 0;
+ va_list ap;
+ if ((oflag & 0x40) != 0)
+ {
+ va_start (ap, oflag);
+ mode = va_arg (ap, int);
+ va_end (ap);
+ }
+ if (expected_char++ != path[0] || path[1] != '\0')
+ abort ();
+ switch (path[0])
+ {
+ case 'a':
+ if (oflag != 0x43 || mode != 0644)
+ abort ();
+ break;
+ case 'b':
+ if (oflag != 0x3)
+ abort ();
+ break;
+ case 'c':
+ if (oflag != 0x2)
+ abort ();
+ break;
+ case 'd':
+ if (oflag != 0x43 || mode != 0600)
+ abort ();
+ break;
+ case 'e':
+ if (oflag != 0x3)
+ abort ();
+ break;
+ default:
+ abort ();
+ }
+ return 0;
+}
+
+extern inline __attribute__((always_inline, gnu_inline)) int
+myopen (const char *path, int oflag, ...)
+{
+ if (__builtin_va_arg_pack_len () > 1)
+ warn_open_too_many_arguments ();
+
+ if (__builtin_constant_p (oflag))
+ {
+ if ((oflag & 0x40) != 0 && __builtin_va_arg_pack_len () < 1)
+ {
+ warn_open_missing_mode ();
+ return myopen2 (path, oflag);
+ }
+ return myopenva (path, oflag, __builtin_va_arg_pack ());
+ }
+
+ if (__builtin_va_arg_pack_len () < 1)
+ return myopen2 (path, oflag);
+
+ return myopenva (path, oflag, __builtin_va_arg_pack ());
+}
+
+volatile int l0;
+
+int
+main (void)
+{
+ expected_char = 'a';
+ if (myopen ("a", 0x43, 0644))
+ abort ();
+ if (myopen ("b", 0x3, 0755))
+ abort ();
+ if (myopen ("c", 0x2))
+ abort ();
+ if (myopen ("d", l0 + 0x43, 0600))
+ abort ();
+ if (myopen ("e", l0 + 0x3, 0700))
+ abort ();
+ if (myopen ("f", l0 + 0x2))
+ abort ();
+ /* Invalid use of myopen, but only detectable at runtime. */
+ if (myopen ("g", l0 + 0x43) != -6)
+ abort ();
+ return 0;
+}
--- gcc/testsuite/g++.dg/ext/va-arg-pack-len-1.C.jj 2007-09-14 21:07:41.000000000 +0200
+++ gcc/testsuite/g++.dg/ext/va-arg-pack-len-1.C 2007-09-14 21:07:41.000000000 +0200
@@ -0,0 +1,120 @@
+// { dg-do run }
+// { dg-options "-O2" }
+
+#include <stdarg.h>
+
+extern "C" int warn_open_missing_mode (void);
+extern "C" int warn_open_too_many_arguments (void);
+extern "C" void abort (void);
+
+char expected_char;
+
+__attribute__((noinline)) int
+myopen2 (const char *path, int oflag)
+{
+ if (expected_char++ != path[0] || path[1] != '\0')
+ abort ();
+ switch (path[0])
+ {
+ case 'f':
+ if (oflag != 0x2)
+ abort ();
+ break;
+ case 'g':
+ if (oflag != 0x43)
+ abort ();
+ // In real __open_2 this would terminate the program:
+ // open with O_CREAT without third argument.
+ return -6;
+ default:
+ abort ();
+ }
+ return 0;
+}
+
+__attribute__((noinline)) int
+myopenva (const char *path, int oflag, ...)
+{
+ int mode = 0;
+ va_list ap;
+ if ((oflag & 0x40) != 0)
+ {
+ va_start (ap, oflag);
+ mode = va_arg (ap, int);
+ va_end (ap);
+ }
+ if (expected_char++ != path[0] || path[1] != '\0')
+ abort ();
+ switch (path[0])
+ {
+ case 'a':
+ if (oflag != 0x43 || mode != 0644)
+ abort ();
+ break;
+ case 'b':
+ if (oflag != 0x3)
+ abort ();
+ break;
+ case 'c':
+ if (oflag != 0x2)
+ abort ();
+ break;
+ case 'd':
+ if (oflag != 0x43 || mode != 0600)
+ abort ();
+ break;
+ case 'e':
+ if (oflag != 0x3)
+ abort ();
+ break;
+ default:
+ abort ();
+ }
+ return 0;
+}
+
+extern inline __attribute__((always_inline, gnu_inline)) int
+myopen (const char *path, int oflag, ...)
+{
+ if (__builtin_va_arg_pack_len () > 1)
+ warn_open_too_many_arguments ();
+
+ if (__builtin_constant_p (oflag))
+ {
+ if ((oflag & 0x40) != 0 && __builtin_va_arg_pack_len () < 1)
+ {
+ warn_open_missing_mode ();
+ return myopen2 (path, oflag);
+ }
+ return myopenva (path, oflag, __builtin_va_arg_pack ());
+ }
+
+ if (__builtin_va_arg_pack_len () < 1)
+ return myopen2 (path, oflag);
+
+ return myopenva (path, oflag, __builtin_va_arg_pack ());
+}
+
+volatile int l0;
+
+int
+main (void)
+{
+ expected_char = 'a';
+ if (myopen ("a", 0x43, 0644))
+ abort ();
+ if (myopen ("b", 0x3, 0755))
+ abort ();
+ if (myopen ("c", 0x2))
+ abort ();
+ if (myopen ("d", l0 + 0x43, 0600))
+ abort ();
+ if (myopen ("e", l0 + 0x3, 0700))
+ abort ();
+ if (myopen ("f", l0 + 0x2))
+ abort ();
+ // Invalid use of myopen, but only detectable at runtime.
+ if (myopen ("g", l0 + 0x43) != -6)
+ abort ();
+ return 0;
+}
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