Issue 9025045: [google] Add function name to function_patch_* sections

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Created:
12 years, 7 months ago by harshit

Modified:
12 years, 7 months ago

Reviewers:
davidxl

CC:
gcc-patches_gcc.gnu.org, Sriraman

Visibility:
Public.

Patch Set 1 #

Created: 12 years, 7 months ago

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		Unified diffs	Side-by-side diffs	Delta from patch set	Stats (+16 lines, -2 lines)			Patch
	M	gcc/config/i386/i386.c	View		3 chunks	+16 lines, -2 lines	0 comments	Download

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Total messages: 3

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harshit

Adding function name to the function_patch_* sections when -ffunction-sections is provided. Helps in garbage collecting ...

12 years, 7 months ago (2013-04-30 20:53:46 UTC) #1

Adding function name to the function_patch_* sections when -ffunction-sections
is provided. Helps in garbage collecting dead functions with the help of
linker.

Tested:
  Tested using 'make -k check-gcc RUNTESTFLAGS="i386.exp=patch*
--target_board=unix\{-m32,,-m64\}"'.

2013-04-30  Harshit Chopra  <harshit@google.com>

	* gcc/config/i386/i386.c (ix86_output_function_nops_prologue_epilogue):
	(ix86_elf_asm_named_section):

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index aa6ec82..7cb832b 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -11285,6 +11285,8 @@ ix86_output_function_nops_prologue_epilogue (FILE
*file,
   unsigned int section_flags = SECTION_RELRO;
   char *section_name_comdat = NULL;
   const char *decl_section_name = NULL;
+  const char *func_name = NULL;
+  char *section_name_function_sections = NULL;
   size_t len;
 
   gcc_assert (num_remaining_nops >= 0);
@@ -11336,12 +11338,24 @@ ix86_output_function_nops_prologue_epilogue (FILE
*file,
     {
       decl_section_name =
           TREE_STRING_POINTER (DECL_SECTION_NAME (current_function_decl));
-      len = strlen (decl_section_name) + strlen (section_name) + 1;
+      len = strlen (decl_section_name) + strlen (section_name) + 2;
       section_name_comdat = (char *) alloca (len);
       sprintf (section_name_comdat, "%s.%s", section_name, decl_section_name);
       section_name = section_name_comdat;
       section_flags |= SECTION_LINKONCE;
     }
+  else if (flag_function_sections)
+    {
+      func_name = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);
+      if (func_name)
+        {
+          len = strlen (func_name) + strlen (section_name) + 2;
+          section_name_function_sections = (char *) alloca (len);
+          sprintf (section_name_function_sections, "%s.%s", section_name,
+                   func_name);
+          section_name = section_name_function_sections;
+        }
+    }
   section = get_section (section_name, section_flags, current_function_decl);
   switch_to_section (section);
   /* Align the section to 8-byte boundary.  */
@@ -11369,7 +11383,7 @@ ix86_elf_asm_named_section (const char *name, unsigned
int flags,
                             tree decl)
 {
   const char *section_name = name;
-  if (HAVE_COMDAT_GROUP && flags & SECTION_LINKONCE)
+  if (!flag_function_sections && HAVE_COMDAT_GROUP && flags &
SECTION_LINKONCE)
     {
       const int prologue_section_name_length =
           sizeof(FUNCTION_PATCH_PROLOGUE_SECTION) - 1;

--
This patch is available for review at http://codereview.appspot.com/9025045

davidxl

ok. David On Tue, Apr 30, 2013 at 1:34 PM, Harshit Chopra <harshit@google.com> wrote: > ...

12 years, 7 months ago (2013-04-30 23:38:13 UTC) #2

ok.

David

On Tue, Apr 30, 2013 at 1:34 PM, Harshit Chopra <harshit@google.com> wrote:
> Adding function name to the function_patch_* sections when -ffunction-sections
is provided. Helps in garbage collecting dead functions with the help of
linker.
>
> Tested:
>   Tested using 'make -k check-gcc RUNTESTFLAGS="i386.exp=patch*
--target_board=unix\{-m32,,-m64\}"'.
>
> 2013-04-30  Harshit Chopra  <harshit@google.com>
>
>         * gcc/config/i386/i386.c
(ix86_output_function_nops_prologue_epilogue):
>         (ix86_elf_asm_named_section):
>
> diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
> index aa6ec82..7cb832b 100644
> --- a/gcc/config/i386/i386.c
> +++ b/gcc/config/i386/i386.c
> @@ -11285,6 +11285,8 @@ ix86_output_function_nops_prologue_epilogue (FILE
*file,
>    unsigned int section_flags = SECTION_RELRO;
>    char *section_name_comdat = NULL;
>    const char *decl_section_name = NULL;
> +  const char *func_name = NULL;
> +  char *section_name_function_sections = NULL;
>    size_t len;
>
>    gcc_assert (num_remaining_nops >= 0);
> @@ -11336,12 +11338,24 @@ ix86_output_function_nops_prologue_epilogue (FILE
*file,
>      {
>        decl_section_name =
>            TREE_STRING_POINTER (DECL_SECTION_NAME (current_function_decl));
> -      len = strlen (decl_section_name) + strlen (section_name) + 1;
> +      len = strlen (decl_section_name) + strlen (section_name) + 2;
>        section_name_comdat = (char *) alloca (len);
>        sprintf (section_name_comdat, "%s.%s", section_name,
decl_section_name);
>        section_name = section_name_comdat;
>        section_flags |= SECTION_LINKONCE;
>      }
> +  else if (flag_function_sections)
> +    {
> +      func_name = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);
> +      if (func_name)
> +        {
> +          len = strlen (func_name) + strlen (section_name) + 2;
> +          section_name_function_sections = (char *) alloca (len);
> +          sprintf (section_name_function_sections, "%s.%s", section_name,
> +                   func_name);
> +          section_name = section_name_function_sections;
> +        }
> +    }
>    section = get_section (section_name, section_flags,
current_function_decl);
>    switch_to_section (section);
>    /* Align the section to 8-byte boundary.  */
> @@ -11369,7 +11383,7 @@ ix86_elf_asm_named_section (const char *name, unsigned
int flags,
>                              tree decl)
>  {
>    const char *section_name = name;
> -  if (HAVE_COMDAT_GROUP && flags & SECTION_LINKONCE)
> +  if (!flag_function_sections && HAVE_COMDAT_GROUP && flags &
SECTION_LINKONCE)
>      {
>        const int prologue_section_name_length =
>            sizeof(FUNCTION_PATCH_PROLOGUE_SECTION) - 1;
>
> --
> This patch is available for review at http://codereview.appspot.com/9025045

harshit

12 years, 7 months ago (2013-05-01 00:23:23 UTC) #3

Thanks for the review. Submitted as r198485.


--
Harshit


On Tue, Apr 30, 2013 at 4:38 PM, Xinliang David Li <davidxl@google.com>wrote:

> ok.
>
> David
>
> On Tue, Apr 30, 2013 at 1:34 PM, Harshit Chopra <harshit@google.com>
> wrote:
> > Adding function name to the function_patch_* sections when
> -ffunction-sections is provided. Helps in garbage collecting dead functions
> with the help of linker.
> >
> > Tested:
> >   Tested using 'make -k check-gcc RUNTESTFLAGS="i386.exp=patch*
> --target_board=unix\{-m32,,-m64\}"'.
> >
> > 2013-04-30  Harshit Chopra  <harshit@google.com>
> >
> >         * gcc/config/i386/i386.c
> (ix86_output_function_nops_prologue_epilogue):
> >         (ix86_elf_asm_named_section):
> >
> > diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
> > index aa6ec82..7cb832b 100644
> > --- a/gcc/config/i386/i386.c
> > +++ b/gcc/config/i386/i386.c
> > @@ -11285,6 +11285,8 @@ ix86_output_function_nops_prologue_epilogue
> (FILE *file,
> >    unsigned int section_flags = SECTION_RELRO;
> >    char *section_name_comdat = NULL;
> >    const char *decl_section_name = NULL;
> > +  const char *func_name = NULL;
> > +  char *section_name_function_sections = NULL;
> >    size_t len;
> >
> >    gcc_assert (num_remaining_nops >= 0);
> > @@ -11336,12 +11338,24 @@ ix86_output_function_nops_prologue_epilogue
> (FILE *file,
> >      {
> >        decl_section_name =
> >            TREE_STRING_POINTER (DECL_SECTION_NAME
> (current_function_decl));
> > -      len = strlen (decl_section_name) + strlen (section_name) + 1;
> > +      len = strlen (decl_section_name) + strlen (section_name) + 2;
> >        section_name_comdat = (char *) alloca (len);
> >        sprintf (section_name_comdat, "%s.%s", section_name,
> decl_section_name);
> >        section_name = section_name_comdat;
> >        section_flags |= SECTION_LINKONCE;
> >      }
> > +  else if (flag_function_sections)
> > +    {
> > +      func_name = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);
> > +      if (func_name)
> > +        {
> > +          len = strlen (func_name) + strlen (section_name) + 2;
> > +          section_name_function_sections = (char *) alloca (len);
> > +          sprintf (section_name_function_sections, "%s.%s",
> section_name,
> > +                   func_name);
> > +          section_name = section_name_function_sections;
> > +        }
> > +    }
> >    section = get_section (section_name, section_flags,
> current_function_decl);
> >    switch_to_section (section);
> >    /* Align the section to 8-byte boundary.  */
> > @@ -11369,7 +11383,7 @@ ix86_elf_asm_named_section (const char *name,
> unsigned int flags,
> >                              tree decl)
> >  {
> >    const char *section_name = name;
> > -  if (HAVE_COMDAT_GROUP && flags & SECTION_LINKONCE)
> > +  if (!flag_function_sections && HAVE_COMDAT_GROUP && flags &
> SECTION_LINKONCE)
> >      {
> >        const int prologue_section_name_length =
> >            sizeof(FUNCTION_PATCH_PROLOGUE_SECTION) - 1;
> >
> > --
> > This patch is available for review at
> http://codereview.appspot.com/9025045
>

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