Support %f in pp_format

Numerous formatted messages from the inliner use %f, mostly as %f, but
occasionally with length modifiers.

This patch implements the simplest case of "%f" for pp_format (with no
modifier support) to make it easier to port these messages from fprintf
to dump_printf_loc.

The selftest has an assertion that %f on 1.0 is printed as "1.000000".
This comes from the host's sprintf, and I believe this is guaranteed by
POSIX: "If the precision is missing, it shall be taken as 6".  If this is
an issue I can drop the selftest.

gcc/c-family/ChangeLog:
	* c-format.c (gcc_dump_printf_char_table): Add entry for %f.

gcc/ChangeLog:
	* pretty-print.c (pp_format): Handle %f.
	(selftest::test_pp_format): Add test of %f.
	* pretty-print.h (pp_double): New macro.

gcc/testsuite/ChangeLog:
	* gcc.dg/format/gcc_diag-10.c: Add coverage for %f.

From-SVN: r265919

gcc/ChangeLog

@@ -1,3 +1,9 @@
+2018-11-08  David Malcolm  <dmalcolm@redhat.com>
+
+	* pretty-print.c (pp_format): Handle %f.
+	(selftest::test_pp_format): Add test of %f.
+	* pretty-print.h (pp_double): New macro.
+
 2018-11-08  David Malcolm  <dmalcolm@redhat.com>
 
 	* dump-context.h (ASSERT_IS_CGRAPH_NODE): New macro.

gcc/c-family/ChangeLog

@@ -1,3 +1,7 @@
+2018-11-08  David Malcolm  <dmalcolm@redhat.com>
+
+	* c-format.c (gcc_dump_printf_char_table): Add entry for %f.
+
 2018-11-08  David Malcolm  <dmalcolm@redhat.com>
 
 	* c-format.c (local_cgraph_node_ptr_node): New variable.

gcc/c-family/c-format.c

@@ -810,6 +810,9 @@ static const format_char_info gcc_dump_printf_char_table[] =
   /* T requires a "tree" at runtime.  */
   { "T",   1, STD_C89, { T89_T,   BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN  }, "", "\"",   NULL },
 
+  /* %f requires a "double"; it doesn't support modifiers.  */
+  { "f",   0, STD_C89, { T89_D,   BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN  }, "", "\"",   NULL },
+
   { NULL,  0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
 };
 

gcc/pretty-print.c

@@ -977,6 +977,7 @@ pp_indent (pretty_printer *pp)
    %ld, %li, %lo, %lu, %lx: long versions of the above.
    %lld, %lli, %llo, %llu, %llx: long long versions.
    %wd, %wi, %wo, %wu, %wx: HOST_WIDE_INT versions.
+   %f: double
    %c: character.
    %s: string.
    %p: pointer (printed in a host-dependent manner).
@@ -1307,6 +1308,10 @@ pp_format (pretty_printer *pp, text_info *text)
 	      (pp, *text->args_ptr, precision, unsigned, "u");
 	  break;
 
+	case 'f':
+	  pp_double (pp, va_arg (*text->args_ptr, double));
+	  break;
+
 	case 'Z':
 	  {
 	    int *v = va_arg (*text->args_ptr, int *);
@@ -2160,6 +2165,7 @@ test_pp_format ()
   ASSERT_PP_FORMAT_2 ("17 12345678", "%wo %x", (HOST_WIDE_INT)15, 0x12345678);
   ASSERT_PP_FORMAT_2 ("0xcafebabe 12345678", "%wx %x", (HOST_WIDE_INT)0xcafebabe,
 		      0x12345678);
+  ASSERT_PP_FORMAT_2 ("1.000000 12345678", "%f %x", 1.0, 0x12345678);
   ASSERT_PP_FORMAT_2 ("A 12345678", "%c %x", 'A', 0x12345678);
   ASSERT_PP_FORMAT_2 ("hello world 12345678", "%s %x", "hello world",
 		      0x12345678);

gcc/pretty-print.h

@@ -330,6 +330,7 @@ pp_get_prefix (const pretty_printer *pp) { return pp->prefix; }
       pp_string (PP, pp_buffer (PP)->digit_buffer);		\
     }								\
   while (0)
+#define pp_double(PP, F)       pp_scalar (PP, "%f", F)
 #define pp_pointer(PP, P)      pp_scalar (PP, "%p", P)
 
 #define pp_identifier(PP, ID)  pp_string (PP, (pp_translate_identifiers (PP) \

gcc/testsuite/ChangeLog

@@ -1,3 +1,7 @@
+2018-11-08  David Malcolm  <dmalcolm@redhat.com>
+
+	* gcc.dg/format/gcc_diag-10.c: Add coverage for %f.
+
 2018-11-08  David Malcolm  <dmalcolm@redhat.com>
 
 	* gcc.dg/format/gcc_diag-10.c (cgraph_node): New typedef.

gcc/testsuite/gcc.dg/format/gcc_diag-10.c

@@ -183,4 +183,6 @@ void test_dump (tree t, gimple *stmt, cgraph_node *node)
   dump ("%T", t);
   dump ("%G", stmt);
   dump ("%C", node);
+  dump ("%f", 1.0);
+  dump ("%4.2f", 1.0); /* { dg-warning "format" } */
 }