gcov: Add __gcov_info_to_gdca()

Add __gcov_info_to_gcda() to libgcov to get the gcda data for a gcda info in a
freestanding environment.  It is intended to be used with the
-fprofile-info-section option.  A crude test program which doesn't use a linker
script is (use "gcc -coverage -fprofile-info-section -lgcov test.c" to compile
it):

  #include <gcov.h>
  #include <stdio.h>
  #include <stdlib.h>

  extern const struct gcov_info *my_info;

  static void
  filename (const char *f, void *arg)
  {
    printf("filename: %s\n", f);
  }

  static void
  dump (const void *d, unsigned n, void *arg)
  {
    const unsigned char *c = d;

    for (unsigned i = 0; i < n; ++i)
      printf ("%02x", c[i]);
  }

  static void *
  allocate (unsigned length, void *arg)
  {
    return malloc (length);
  }

  int main()
  {
    __asm__ volatile (".set my_info, .LPBX2");
    __gcov_info_to_gcda (my_info, filename, dump, allocate, NULL);
    return 0;
  }

With this patch, <stdint.h> is included in libgcov-driver.c even if
inhibit_libc is defined.  This header file should be also available for
freestanding environments.  If this is not the case, then we have to define
intptr_t somehow.

The patch removes one use of memset() which makes the <string.h> include
superfluous.

gcc/

	* gcov-io.h (gcov_write): Declare.
	* gcov-io.c (gcov_write): New.
	(gcov_write_counter): Remove.
	(gcov_write_tag_length): Likewise.
	(gcov_write_summary): Replace gcov_write_tag_length() with calls to
	gcov_write_unsigned().
	* doc/invoke.texi (fprofile-info-section): Mention
	__gcov_info_to_gdca().

gcc/testsuite/

	* gcc.dg/gcov-info-to-gcda.c: New test.

libgcc/

	* Makefile.in (LIBGCOV_DRIVER): Add _gcov_info_to_gcda.
	* gcov.h (gcov_info): Declare.
	(__gcov_info_to_gdca): Likewise.
	* libgcov.h (gcov_write_counter): Remove.
	(gcov_write_tag_length): Likewise.
	* libgcov-driver.c (#include <stdint.h>): New.
	(#include <string.h>): Remove.
	(NEED_L_GCOV): Conditionally define.
	(NEED_L_GCOV_INFO_TO_GCDA): Likewise.
	(are_all_counters_zero): New.
	(gcov_dump_handler): Likewise.
	(gcov_allocate_handler): Likewise.
	(dump_unsigned): Likewise.
	(dump_counter): Likewise.
	(write_topn_counters): Add dump_fn, allocate_fn, and arg parameters.
	Use dump_unsigned() and dump_counter().
	(write_one_data): Add dump_fn, allocate_fn, and arg parameters.  Use
	dump_unsigned(), dump_counter(), and are_all_counters_zero().
	(__gcov_info_to_gcda): New.

1 files changed, 11 insertions, 25 deletions

diff --git a/gcc/gcov-io.c b/gcc/gcov-io.c
index 7819593..d3e56af 100644
--- a/gcc/gcov-io.c
+++ b/gcc/gcov-io.c
@@ -229,30 +229,25 @@ gcov_magic (gcov_unsigned_t magic, gcov_unsigned_t expected)
 #endif
 
 #if !IN_GCOV
-/* Write unsigned VALUE to coverage file.  */
+/* Write DATA of LENGTH characters to coverage file.  */
 
 GCOV_LINKAGE void
-gcov_write_unsigned (gcov_unsigned_t value)
+gcov_write (const void *data, unsigned length)
 {
-  gcov_unsigned_t r = fwrite (&value, sizeof (value), 1, gcov_var.file);
+  gcov_unsigned_t r = fwrite (data, length, 1, gcov_var.file);
   if (r != 1)
     gcov_var.error = 1;
 }
 
-/* Write counter VALUE to coverage file.  Sets error flag
-   appropriately.  */
+/* Write unsigned VALUE to coverage file.  */
 
-#if IN_LIBGCOV
 GCOV_LINKAGE void
-gcov_write_counter (gcov_type value)
+gcov_write_unsigned (gcov_unsigned_t value)
 {
-  gcov_write_unsigned ((gcov_unsigned_t) value);
-  if (sizeof (value) > sizeof (gcov_unsigned_t))
-    gcov_write_unsigned ((gcov_unsigned_t) (value >> 32));
-  else
-    gcov_write_unsigned (0);
+  gcov_unsigned_t r = fwrite (&value, sizeof (value), 1, gcov_var.file);
+  if (r != 1)
+    gcov_var.error = 1;
 }
-#endif /* IN_LIBGCOV */
 
 #if !IN_LIBGCOV
 /* Write STRING to coverage file.  Sets error flag on file
@@ -349,22 +344,13 @@ gcov_write_length (gcov_position_t position)
 
 #else /* IN_LIBGCOV */
 
-/* Write a tag TAG and length LENGTH.  */
-
-GCOV_LINKAGE void
-gcov_write_tag_length (gcov_unsigned_t tag, gcov_unsigned_t length)
-{
-  gcov_write_unsigned (tag);
-  gcov_write_unsigned (length);
-}
-
-/* Write a summary structure to the gcov file.  Return nonzero on
-   overflow.  */
+/* Write a summary structure to the gcov file.  */
 
 GCOV_LINKAGE void
 gcov_write_summary (gcov_unsigned_t tag, const struct gcov_summary *summary)
 {
-  gcov_write_tag_length (tag, GCOV_TAG_SUMMARY_LENGTH);
+  gcov_write_unsigned (tag);
+  gcov_write_unsigned (GCOV_TAG_SUMMARY_LENGTH);
   gcov_write_unsigned (summary->runs);
   gcov_write_unsigned (summary->sum_max);
 }