[RFA] Use gdb::byte_vector when reading section data

Message ID 20180309183349.18352-1-tom@tromey.com
State New
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  • [RFA] Use gdb::byte_vector when reading section data
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Commit Message

Tom Tromey March 9, 2018, 6:33 p.m.
This changes a couple of spots that read section data to use
gdb::byte_vector rather than a cleanup.

Regression tested by the buildbot.  I am not certain that the buildbot
actually tests the code in question, so I recommend careful review.

gdb/ChangeLog
2018-03-09  Tom Tromey  <tom@tromey.com>

	* rs6000-aix-tdep.c (rs6000_aix_core_xfer_shared_libraries_aix):
	Use gdb::byte_vector.
	* arm-tdep.c (arm_exidx_new_objfile): Use gdb::byte_vector.
---
 gdb/ChangeLog         |  6 ++++++
 gdb/arm-tdep.c        | 39 +++++++++++++++------------------------
 gdb/rs6000-aix-tdep.c | 15 ++++-----------
 3 files changed, 25 insertions(+), 35 deletions(-)

-- 
2.13.6

Comments

Joel Brobecker March 11, 2018, 2:11 p.m. | #1
> This changes a couple of spots that read section data to use

> gdb::byte_vector rather than a cleanup.

> 

> Regression tested by the buildbot.  I am not certain that the buildbot

> actually tests the code in question, so I recommend careful review.

> 

> gdb/ChangeLog

> 2018-03-09  Tom Tromey  <tom@tromey.com>

> 

> 	* rs6000-aix-tdep.c (rs6000_aix_core_xfer_shared_libraries_aix):

> 	Use gdb::byte_vector.

> 	* arm-tdep.c (arm_exidx_new_objfile): Use gdb::byte_vector.


FWIW, I gave this patch a careful read, and it looked sane to me.
But I only consider myself a yellow-belt-C++-student, so a careful
review from someone else would be useful too.

As far as I can tell, the buildbots include ppc-aix, so the patch
was tested there as well, so additional runs would probably not
help, right? (I am pretty sure that the shared library code is
exercised).


> ---

>  gdb/ChangeLog         |  6 ++++++

>  gdb/arm-tdep.c        | 39 +++++++++++++++------------------------

>  gdb/rs6000-aix-tdep.c | 15 ++++-----------

>  3 files changed, 25 insertions(+), 35 deletions(-)

> 

> diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c

> index ef7e66b36a..52d3f41cee 100644

> --- a/gdb/arm-tdep.c

> +++ b/gdb/arm-tdep.c

> @@ -2040,50 +2040,41 @@ arm_obj_section_from_vma (struct objfile *objfile, bfd_vma vma)

>  static void

>  arm_exidx_new_objfile (struct objfile *objfile)

>  {

> -  struct cleanup *cleanups;

>    struct arm_exidx_data *data;

>    asection *exidx, *extab;

>    bfd_vma exidx_vma = 0, extab_vma = 0;

>    bfd_size_type exidx_size = 0, extab_size = 0;

> -  gdb_byte *exidx_data = NULL, *extab_data = NULL;

>    LONGEST i;

>  

>    /* If we've already touched this file, do nothing.  */

>    if (!objfile || objfile_data (objfile, arm_exidx_data_key) != NULL)

>      return;

> -  cleanups = make_cleanup (null_cleanup, NULL);

>  

>    /* Read contents of exception table and index.  */

>    exidx = bfd_get_section_by_name (objfile->obfd, ELF_STRING_ARM_unwind);

> +  gdb::byte_vector exidx_data;

>    if (exidx)

>      {

>        exidx_vma = bfd_section_vma (objfile->obfd, exidx);

>        exidx_size = bfd_get_section_size (exidx);

> -      exidx_data = (gdb_byte *) xmalloc (exidx_size);

> -      make_cleanup (xfree, exidx_data);

> +      exidx_data.resize (exidx_size);

>  

>        if (!bfd_get_section_contents (objfile->obfd, exidx,

> -				     exidx_data, 0, exidx_size))

> -	{

> -	  do_cleanups (cleanups);

> -	  return;

> -	}

> +				     exidx_data.data (), 0, exidx_size))

> +	return;

>      }

>  

>    extab = bfd_get_section_by_name (objfile->obfd, ".ARM.extab");

> +  gdb::byte_vector extab_data;

>    if (extab)

>      {

>        extab_vma = bfd_section_vma (objfile->obfd, extab);

>        extab_size = bfd_get_section_size (extab);

> -      extab_data = (gdb_byte *) xmalloc (extab_size);

> -      make_cleanup (xfree, extab_data);

> +      extab_data.resize (extab_size);

>  

>        if (!bfd_get_section_contents (objfile->obfd, extab,

> -				     extab_data, 0, extab_size))

> -	{

> -	  do_cleanups (cleanups);

> -	  return;

> -	}

> +				     extab_data.data (), 0, extab_size))

> +	return;

>      }

>  

>    /* Allocate exception table data structure.  */

> @@ -2097,8 +2088,9 @@ arm_exidx_new_objfile (struct objfile *objfile)

>    for (i = 0; i < exidx_size / 8; i++)

>      {

>        struct arm_exidx_entry new_exidx_entry;

> -      bfd_vma idx = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8);

> -      bfd_vma val = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8 + 4);

> +      bfd_vma idx = bfd_h_get_32 (objfile->obfd, exidx_data.data () + i * 8);

> +      bfd_vma val = bfd_h_get_32 (objfile->obfd,

> +				  exidx_data.data () + i * 8 + 4);

>        bfd_vma addr = 0, word = 0;

>        int n_bytes = 0, n_words = 0;

>        struct obj_section *sec;

> @@ -2135,7 +2127,7 @@ arm_exidx_new_objfile (struct objfile *objfile)

>  	  if (addr >= extab_vma && addr + 4 <= extab_vma + extab_size)

>  	    {

>  	      word = bfd_h_get_32 (objfile->obfd,

> -				   extab_data + addr - extab_vma);

> +				   extab_data.data () + addr - extab_vma);

>  	      addr += 4;

>  

>  	      if ((word & 0xff000000) == 0x80000000)

> @@ -2193,7 +2185,8 @@ arm_exidx_new_objfile (struct objfile *objfile)

>  		      && addr + 4 <= extab_vma + extab_size)

>  		    {

>  		      word = bfd_h_get_32 (objfile->obfd,

> -					   extab_data + addr - extab_vma);

> +					   (extab_data.data ()

> +					    + addr - extab_vma));

>  		      addr += 4;

>  		      n_bytes = 3;

>  		      n_words = ((word >> 24) & 0xff);

> @@ -2222,7 +2215,7 @@ arm_exidx_new_objfile (struct objfile *objfile)

>  	  while (n_words--)

>  	    {

>  	      word = bfd_h_get_32 (objfile->obfd,

> -				   extab_data + addr - extab_vma);

> +				   extab_data.data () + addr - extab_vma);

>  	      addr += 4;

>  

>  	      *p++ = (gdb_byte) ((word >> 24) & 0xff);

> @@ -2243,8 +2236,6 @@ arm_exidx_new_objfile (struct objfile *objfile)

>  		     data->section_maps[sec->the_bfd_section->index],

>  		     &new_exidx_entry);

>      }

> -

> -  do_cleanups (cleanups);

>  }

>  

>  /* Search for the exception table entry covering MEMADDR.  If one is found,

> diff --git a/gdb/rs6000-aix-tdep.c b/gdb/rs6000-aix-tdep.c

> index 38c86d4cd8..e3e086c210 100644

> --- a/gdb/rs6000-aix-tdep.c

> +++ b/gdb/rs6000-aix-tdep.c

> @@ -1007,9 +1007,6 @@ rs6000_aix_core_xfer_shared_libraries_aix (struct gdbarch *gdbarch,

>  {

>    struct bfd_section *ldinfo_sec;

>    int ldinfo_size;

> -  gdb_byte *ldinfo_buf;

> -  struct cleanup *cleanup;

> -  LONGEST result;

>  

>    ldinfo_sec = bfd_get_section_by_name (core_bfd, ".ldinfo");

>    if (ldinfo_sec == NULL)

> @@ -1017,19 +1014,15 @@ rs6000_aix_core_xfer_shared_libraries_aix (struct gdbarch *gdbarch,

>  	   bfd_errmsg (bfd_get_error ()));

>    ldinfo_size = bfd_get_section_size (ldinfo_sec);

>  

> -  ldinfo_buf = (gdb_byte *) xmalloc (ldinfo_size);

> -  cleanup = make_cleanup (xfree, ldinfo_buf);

> +  gdb::byte_vector ldinfo_buf (ldinfo_size);

>  

>    if (! bfd_get_section_contents (core_bfd, ldinfo_sec,

> -				  ldinfo_buf, 0, ldinfo_size))

> +				  ldinfo_buf.data (), 0, ldinfo_size))

>      error (_("unable to read .ldinfo section from core file: %s"),

>  	  bfd_errmsg (bfd_get_error ()));

>  

> -  result = rs6000_aix_ld_info_to_xml (gdbarch, ldinfo_buf, readbuf,

> -				      offset, len, 0);

> -

> -  do_cleanups (cleanup);

> -  return result;

> +  return rs6000_aix_ld_info_to_xml (gdbarch, ldinfo_buf.data (), readbuf,

> +				    offset, len, 0);

>  }

>  

>  static void

> -- 

> 2.13.6


-- 
Joel
Simon Marchi March 11, 2018, 4:07 p.m. | #2
On 2018-03-11 10:11 AM, Joel Brobecker wrote:
>> This changes a couple of spots that read section data to use

>> gdb::byte_vector rather than a cleanup.

>>

>> Regression tested by the buildbot.  I am not certain that the buildbot

>> actually tests the code in question, so I recommend careful review.

>>

>> gdb/ChangeLog

>> 2018-03-09  Tom Tromey  <tom@tromey.com>

>>

>> 	* rs6000-aix-tdep.c (rs6000_aix_core_xfer_shared_libraries_aix):

>> 	Use gdb::byte_vector.

>> 	* arm-tdep.c (arm_exidx_new_objfile): Use gdb::byte_vector.

> 

> FWIW, I gave this patch a careful read, and it looked sane to me.

> But I only consider myself a yellow-belt-C++-student, so a careful

> review from someone else would be useful too.

> 

> As far as I can tell, the buildbots include ppc-aix, so the patch

> was tested there as well, so additional runs would probably not

> help, right? (I am pretty sure that the shared library code is

> exercised).


LGTM too, though in arm-tdep.c, I would suggest getting rid of the
exidx_size and extab_size variables, and to use the std::vector::size
instead.

Simon
Tom Tromey March 12, 2018, 2:44 a.m. | #3
>>>>> "Simon" == Simon Marchi <simark@simark.ca> writes:


Simon> LGTM too, though in arm-tdep.c, I would suggest getting rid of the
Simon> exidx_size and extab_size variables, and to use the std::vector::size
Simon> instead.

How about this?

Tom

commit 92b6424f62eea5251d4424c54c68b0f119e21db1
Author: Tom Tromey <tom@tromey.com>
Date:   Thu Mar 8 22:28:54 2018 -0700

    Use gdb::byte_vector when reading section data
    
    This changes a couple of spots that read section data to use
    gdb::byte_vector rather than a cleanup.
    
    Regression tested by the buildbot.  I am not certain that the buildbot
    actually tests the code in question, so I recommend careful review.
    
    gdb/ChangeLog
    2018-03-09  Tom Tromey  <tom@tromey.com>
    
            * rs6000-aix-tdep.c (rs6000_aix_core_xfer_shared_libraries_aix):
            Use gdb::byte_vector.
            * arm-tdep.c (arm_exidx_new_objfile): Use gdb::byte_vector.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 8234b6dcba..7fd2a41390 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2018-03-09  Tom Tromey  <tom@tromey.com>
+
+	* rs6000-aix-tdep.c (rs6000_aix_core_xfer_shared_libraries_aix):
+	Use gdb::byte_vector.
+	* arm-tdep.c (arm_exidx_new_objfile): Use gdb::byte_vector.
+
 2018-03-09  Eli Zaretskii  <eliz@gnu.org>
 
 	* top.c (print_gdb_configuration): Reflect LIBIPT, LIBMEMCHECK,
diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index ef7e66b36a..539ee756e1 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -2040,50 +2040,40 @@ arm_obj_section_from_vma (struct objfile *objfile, bfd_vma vma)
 static void
 arm_exidx_new_objfile (struct objfile *objfile)
 {
-  struct cleanup *cleanups;
   struct arm_exidx_data *data;
   asection *exidx, *extab;
   bfd_vma exidx_vma = 0, extab_vma = 0;
-  bfd_size_type exidx_size = 0, extab_size = 0;
-  gdb_byte *exidx_data = NULL, *extab_data = NULL;
   LONGEST i;
 
   /* If we've already touched this file, do nothing.  */
   if (!objfile || objfile_data (objfile, arm_exidx_data_key) != NULL)
     return;
-  cleanups = make_cleanup (null_cleanup, NULL);
 
   /* Read contents of exception table and index.  */
   exidx = bfd_get_section_by_name (objfile->obfd, ELF_STRING_ARM_unwind);
+  gdb::byte_vector exidx_data;
   if (exidx)
     {
       exidx_vma = bfd_section_vma (objfile->obfd, exidx);
-      exidx_size = bfd_get_section_size (exidx);
-      exidx_data = (gdb_byte *) xmalloc (exidx_size);
-      make_cleanup (xfree, exidx_data);
+      exidx_data.resize (bfd_get_section_size (exidx));
 
       if (!bfd_get_section_contents (objfile->obfd, exidx,
-				     exidx_data, 0, exidx_size))
-	{
-	  do_cleanups (cleanups);
-	  return;
-	}
+				     exidx_data.data (), 0,
+				     exidx_data.size ()))
+	return;
     }
 
   extab = bfd_get_section_by_name (objfile->obfd, ".ARM.extab");
+  gdb::byte_vector extab_data;
   if (extab)
     {
       extab_vma = bfd_section_vma (objfile->obfd, extab);
-      extab_size = bfd_get_section_size (extab);
-      extab_data = (gdb_byte *) xmalloc (extab_size);
-      make_cleanup (xfree, extab_data);
+      extab_data.resize (bfd_get_section_size (extab));
 
       if (!bfd_get_section_contents (objfile->obfd, extab,
-				     extab_data, 0, extab_size))
-	{
-	  do_cleanups (cleanups);
-	  return;
-	}
+				     extab_data.data (), 0,
+				     extab_data.size ()))
+	return;
     }
 
   /* Allocate exception table data structure.  */
@@ -2094,11 +2084,12 @@ arm_exidx_new_objfile (struct objfile *objfile)
 				       VEC(arm_exidx_entry_s) *);
 
   /* Fill in exception table.  */
-  for (i = 0; i < exidx_size / 8; i++)
+  for (i = 0; i < exidx_data.size () / 8; i++)
     {
       struct arm_exidx_entry new_exidx_entry;
-      bfd_vma idx = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8);
-      bfd_vma val = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8 + 4);
+      bfd_vma idx = bfd_h_get_32 (objfile->obfd, exidx_data.data () + i * 8);
+      bfd_vma val = bfd_h_get_32 (objfile->obfd,
+				  exidx_data.data () + i * 8 + 4);
       bfd_vma addr = 0, word = 0;
       int n_bytes = 0, n_words = 0;
       struct obj_section *sec;
@@ -2132,10 +2123,10 @@ arm_exidx_new_objfile (struct objfile *objfile)
 	  addr = ((val & 0x7fffffff) ^ 0x40000000) - 0x40000000;
 	  addr += exidx_vma + i * 8 + 4;
 
-	  if (addr >= extab_vma && addr + 4 <= extab_vma + extab_size)
+	  if (addr >= extab_vma && addr + 4 <= extab_vma + extab_data.size ())
 	    {
 	      word = bfd_h_get_32 (objfile->obfd,
-				   extab_data + addr - extab_vma);
+				   extab_data.data () + addr - extab_vma);
 	      addr += 4;
 
 	      if ((word & 0xff000000) == 0x80000000)
@@ -2190,10 +2181,11 @@ arm_exidx_new_objfile (struct objfile *objfile)
 		     byte, followed by the same unwind instructions as the
 		     pre-defined forms.  */
 		  if (gnu_personality
-		      && addr + 4 <= extab_vma + extab_size)
+		      && addr + 4 <= extab_vma + extab_data.size ())
 		    {
 		      word = bfd_h_get_32 (objfile->obfd,
-					   extab_data + addr - extab_vma);
+					   (extab_data.data ()
+					    + addr - extab_vma));
 		      addr += 4;
 		      n_bytes = 3;
 		      n_words = ((word >> 24) & 0xff);
@@ -2204,7 +2196,8 @@ arm_exidx_new_objfile (struct objfile *objfile)
 
       /* Sanity check address.  */
       if (n_words)
-	if (addr < extab_vma || addr + 4 * n_words > extab_vma + extab_size)
+	if (addr < extab_vma
+	    || addr + 4 * n_words > extab_vma + extab_data.size ())
 	  n_words = n_bytes = 0;
 
       /* The unwind instructions reside in WORD (only the N_BYTES least
@@ -2222,7 +2215,7 @@ arm_exidx_new_objfile (struct objfile *objfile)
 	  while (n_words--)
 	    {
 	      word = bfd_h_get_32 (objfile->obfd,
-				   extab_data + addr - extab_vma);
+				   extab_data.data () + addr - extab_vma);
 	      addr += 4;
 
 	      *p++ = (gdb_byte) ((word >> 24) & 0xff);
@@ -2243,8 +2236,6 @@ arm_exidx_new_objfile (struct objfile *objfile)
 		     data->section_maps[sec->the_bfd_section->index],
 		     &new_exidx_entry);
     }
-
-  do_cleanups (cleanups);
 }
 
 /* Search for the exception table entry covering MEMADDR.  If one is found,
diff --git a/gdb/rs6000-aix-tdep.c b/gdb/rs6000-aix-tdep.c
index 38c86d4cd8..e3e086c210 100644
--- a/gdb/rs6000-aix-tdep.c
+++ b/gdb/rs6000-aix-tdep.c
@@ -1007,9 +1007,6 @@ rs6000_aix_core_xfer_shared_libraries_aix (struct gdbarch *gdbarch,
 {
   struct bfd_section *ldinfo_sec;
   int ldinfo_size;
-  gdb_byte *ldinfo_buf;
-  struct cleanup *cleanup;
-  LONGEST result;
 
   ldinfo_sec = bfd_get_section_by_name (core_bfd, ".ldinfo");
   if (ldinfo_sec == NULL)
@@ -1017,19 +1014,15 @@ rs6000_aix_core_xfer_shared_libraries_aix (struct gdbarch *gdbarch,
 	   bfd_errmsg (bfd_get_error ()));
   ldinfo_size = bfd_get_section_size (ldinfo_sec);
 
-  ldinfo_buf = (gdb_byte *) xmalloc (ldinfo_size);
-  cleanup = make_cleanup (xfree, ldinfo_buf);
+  gdb::byte_vector ldinfo_buf (ldinfo_size);
 
   if (! bfd_get_section_contents (core_bfd, ldinfo_sec,
-				  ldinfo_buf, 0, ldinfo_size))
+				  ldinfo_buf.data (), 0, ldinfo_size))
     error (_("unable to read .ldinfo section from core file: %s"),
 	  bfd_errmsg (bfd_get_error ()));
 
-  result = rs6000_aix_ld_info_to_xml (gdbarch, ldinfo_buf, readbuf,
-				      offset, len, 0);
-
-  do_cleanups (cleanup);
-  return result;
+  return rs6000_aix_ld_info_to_xml (gdbarch, ldinfo_buf.data (), readbuf,
+				    offset, len, 0);
 }
 
 static void
Simon Marchi March 12, 2018, 3:37 a.m. | #4
On 2018-03-11 22:44, Tom Tromey wrote:
> Simon> LGTM too, though in arm-tdep.c, I would suggest getting rid of 

> the

> Simon> exidx_size and extab_size variables, and to use the 

> std::vector::size

> Simon> instead.

> 

> How about this?

> 

> Tom


LGTM, thanks!

Patch

diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index ef7e66b36a..52d3f41cee 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -2040,50 +2040,41 @@  arm_obj_section_from_vma (struct objfile *objfile, bfd_vma vma)
 static void
 arm_exidx_new_objfile (struct objfile *objfile)
 {
-  struct cleanup *cleanups;
   struct arm_exidx_data *data;
   asection *exidx, *extab;
   bfd_vma exidx_vma = 0, extab_vma = 0;
   bfd_size_type exidx_size = 0, extab_size = 0;
-  gdb_byte *exidx_data = NULL, *extab_data = NULL;
   LONGEST i;
 
   /* If we've already touched this file, do nothing.  */
   if (!objfile || objfile_data (objfile, arm_exidx_data_key) != NULL)
     return;
-  cleanups = make_cleanup (null_cleanup, NULL);
 
   /* Read contents of exception table and index.  */
   exidx = bfd_get_section_by_name (objfile->obfd, ELF_STRING_ARM_unwind);
+  gdb::byte_vector exidx_data;
   if (exidx)
     {
       exidx_vma = bfd_section_vma (objfile->obfd, exidx);
       exidx_size = bfd_get_section_size (exidx);
-      exidx_data = (gdb_byte *) xmalloc (exidx_size);
-      make_cleanup (xfree, exidx_data);
+      exidx_data.resize (exidx_size);
 
       if (!bfd_get_section_contents (objfile->obfd, exidx,
-				     exidx_data, 0, exidx_size))
-	{
-	  do_cleanups (cleanups);
-	  return;
-	}
+				     exidx_data.data (), 0, exidx_size))
+	return;
     }
 
   extab = bfd_get_section_by_name (objfile->obfd, ".ARM.extab");
+  gdb::byte_vector extab_data;
   if (extab)
     {
       extab_vma = bfd_section_vma (objfile->obfd, extab);
       extab_size = bfd_get_section_size (extab);
-      extab_data = (gdb_byte *) xmalloc (extab_size);
-      make_cleanup (xfree, extab_data);
+      extab_data.resize (extab_size);
 
       if (!bfd_get_section_contents (objfile->obfd, extab,
-				     extab_data, 0, extab_size))
-	{
-	  do_cleanups (cleanups);
-	  return;
-	}
+				     extab_data.data (), 0, extab_size))
+	return;
     }
 
   /* Allocate exception table data structure.  */
@@ -2097,8 +2088,9 @@  arm_exidx_new_objfile (struct objfile *objfile)
   for (i = 0; i < exidx_size / 8; i++)
     {
       struct arm_exidx_entry new_exidx_entry;
-      bfd_vma idx = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8);
-      bfd_vma val = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8 + 4);
+      bfd_vma idx = bfd_h_get_32 (objfile->obfd, exidx_data.data () + i * 8);
+      bfd_vma val = bfd_h_get_32 (objfile->obfd,
+				  exidx_data.data () + i * 8 + 4);
       bfd_vma addr = 0, word = 0;
       int n_bytes = 0, n_words = 0;
       struct obj_section *sec;
@@ -2135,7 +2127,7 @@  arm_exidx_new_objfile (struct objfile *objfile)
 	  if (addr >= extab_vma && addr + 4 <= extab_vma + extab_size)
 	    {
 	      word = bfd_h_get_32 (objfile->obfd,
-				   extab_data + addr - extab_vma);
+				   extab_data.data () + addr - extab_vma);
 	      addr += 4;
 
 	      if ((word & 0xff000000) == 0x80000000)
@@ -2193,7 +2185,8 @@  arm_exidx_new_objfile (struct objfile *objfile)
 		      && addr + 4 <= extab_vma + extab_size)
 		    {
 		      word = bfd_h_get_32 (objfile->obfd,
-					   extab_data + addr - extab_vma);
+					   (extab_data.data ()
+					    + addr - extab_vma));
 		      addr += 4;
 		      n_bytes = 3;
 		      n_words = ((word >> 24) & 0xff);
@@ -2222,7 +2215,7 @@  arm_exidx_new_objfile (struct objfile *objfile)
 	  while (n_words--)
 	    {
 	      word = bfd_h_get_32 (objfile->obfd,
-				   extab_data + addr - extab_vma);
+				   extab_data.data () + addr - extab_vma);
 	      addr += 4;
 
 	      *p++ = (gdb_byte) ((word >> 24) & 0xff);
@@ -2243,8 +2236,6 @@  arm_exidx_new_objfile (struct objfile *objfile)
 		     data->section_maps[sec->the_bfd_section->index],
 		     &new_exidx_entry);
     }
-
-  do_cleanups (cleanups);
 }
 
 /* Search for the exception table entry covering MEMADDR.  If one is found,
diff --git a/gdb/rs6000-aix-tdep.c b/gdb/rs6000-aix-tdep.c
index 38c86d4cd8..e3e086c210 100644
--- a/gdb/rs6000-aix-tdep.c
+++ b/gdb/rs6000-aix-tdep.c
@@ -1007,9 +1007,6 @@  rs6000_aix_core_xfer_shared_libraries_aix (struct gdbarch *gdbarch,
 {
   struct bfd_section *ldinfo_sec;
   int ldinfo_size;
-  gdb_byte *ldinfo_buf;
-  struct cleanup *cleanup;
-  LONGEST result;
 
   ldinfo_sec = bfd_get_section_by_name (core_bfd, ".ldinfo");
   if (ldinfo_sec == NULL)
@@ -1017,19 +1014,15 @@  rs6000_aix_core_xfer_shared_libraries_aix (struct gdbarch *gdbarch,
 	   bfd_errmsg (bfd_get_error ()));
   ldinfo_size = bfd_get_section_size (ldinfo_sec);
 
-  ldinfo_buf = (gdb_byte *) xmalloc (ldinfo_size);
-  cleanup = make_cleanup (xfree, ldinfo_buf);
+  gdb::byte_vector ldinfo_buf (ldinfo_size);
 
   if (! bfd_get_section_contents (core_bfd, ldinfo_sec,
-				  ldinfo_buf, 0, ldinfo_size))
+				  ldinfo_buf.data (), 0, ldinfo_size))
     error (_("unable to read .ldinfo section from core file: %s"),
 	  bfd_errmsg (bfd_get_error ()));
 
-  result = rs6000_aix_ld_info_to_xml (gdbarch, ldinfo_buf, readbuf,
-				      offset, len, 0);
-
-  do_cleanups (cleanup);
-  return result;
+  return rs6000_aix_ld_info_to_xml (gdbarch, ldinfo_buf.data (), readbuf,
+				    offset, len, 0);
 }
 
 static void