Hi!
Ping.
Grüße
Thomas
On 2023-09-19T10:47:56+0200, I wrote:
> Hi!
>
> Ping.
>
>
> Grüße
> Thomas
>
>
> On 2023-09-08T14:02:50+0200, I wrote:
>> Hi!
>>
>> On 2017-08-10T15:42:13+0200, Jan Hubicka <hubi...@ucw.cz> wrote:
>>>> On 07/31/2017 11:57 AM, Yuri Gribov wrote:
>>>> > On Mon, Jul 31, 2017 at 9:04 AM, Martin Liška <mli...@suse.cz> wrote:
>>>> >> Doing the transformation suggested by Honza.
>>
>> ... which was:
>>
>> | On 2017-07-24T16:06:22+0200, Jan Hubicka <hubi...@ucw.cz> wrote:
>> | > we probably should turn ASM_OUTPUT_DEF ifdefs into a conditional
>> compilation
>> | > incrementally.
>>
>>>> >From 78ee08b25d22125cb1fa248bac98ef1e84504761 Mon Sep 17 00:00:00 2001
>>>> From: marxin <mli...@suse.cz>
>>>> Date: Tue, 25 Jul 2017 13:11:28 +0200
>>>> Subject: [PATCH] Introduce TARGET_SUPPORTS_ALIASES
>>
>> ..., and got pushed as commit a8b522b483ebb8c972ecfde8779a7a6ec16aecd6
>> (Subversion r251048) "Introduce TARGET_SUPPORTS_ALIASES".
>>
>> I don't know if that was actually intentional here, or just an
>> "accident", but such changes actually allow that a back end may or may
>> not provide symbol aliasing support ('TARGET_SUPPORTS_ALIASES')
>> independent of '#ifdef ASM_OUTPUT_DEF', and in particular, depending not
>> just on static but instead on dynamic (run-time) configuration. This is
>> relevant for the nvptx back end's '-malias' flag.
>>
>> There did remain a few instances where we currently still assume that
>> from '#ifdef ASM_OUTPUT_DEF' follows 'TARGET_SUPPORTS_ALIASES', which I'm
>> adjusting in the attached (with '--ignore-space-change', for easy review)
>> "More '#ifdef ASM_OUTPUT_DEF' -> 'if (TARGET_SUPPORTS_ALIASES)' etc.".
>> OK to push?
>>
>> These changes are necessary to cure nvptx regressions raised in
>> <https://inbox.sourceware.org/87iliurqt1....@euler.schwinge.homeip.net>
>> "[nvptx] Use .alias directive for mptx >= 6.3", addressing the comment:
>> "[...] remains to be analyzed".
>>
>>
>> Grüße
>> Thomas
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>From 4c725226c3657adb775af274876de5077b8fbf45 Mon Sep 17 00:00:00 2001
From: Thomas Schwinge <tho...@codesourcery.com>
Date: Thu, 7 Sep 2023 22:15:08 +0200
Subject: [PATCH] More '#ifdef ASM_OUTPUT_DEF' -> 'if
(TARGET_SUPPORTS_ALIASES)' etc.
Per commit a8b522b483ebb8c972ecfde8779a7a6ec16aecd6 (Subversion r251048)
"Introduce TARGET_SUPPORTS_ALIASES", there is the idea that a back end may or
may not provide symbol aliasing support ('TARGET_SUPPORTS_ALIASES') independent
of '#ifdef ASM_OUTPUT_DEF', and in particular, depending not just on static but
instead on dynamic (run-time) configuration. There did remain a few instances
where we currently still assume that from '#ifdef ASM_OUTPUT_DEF' follows
'TARGET_SUPPORTS_ALIASES'. Change these to 'if (TARGET_SUPPORTS_ALIASES)',
similarly, or 'gcc_checking_assert (TARGET_SUPPORTS_ALIASES);'.
gcc/
* ipa-icf.cc (sem_item::target_supports_symbol_aliases_p):
'gcc_checking_assert (TARGET_SUPPORTS_ALIASES);' before
'return true;'.
* ipa-visibility.cc (function_and_variable_visibility): Change
'#ifdef ASM_OUTPUT_DEF' to 'if (TARGET_SUPPORTS_ALIASES)'.
* varasm.cc (output_constant_pool_contents)
[#ifdef ASM_OUTPUT_DEF]:
'gcc_checking_assert (TARGET_SUPPORTS_ALIASES);'.
(do_assemble_alias) [#ifdef ASM_OUTPUT_DEF]:
'if (!TARGET_SUPPORTS_ALIASES)',
'gcc_checking_assert (seen_error ());'.
(assemble_alias): Change '#if !defined (ASM_OUTPUT_DEF)' to
'if (!TARGET_SUPPORTS_ALIASES)'.
(default_asm_output_anchor):
'gcc_checking_assert (TARGET_SUPPORTS_ALIASES);'.
---
gcc/ipa-icf.cc | 1 +
gcc/ipa-visibility.cc | 8 +++++---
gcc/varasm.cc | 13 ++++++++++---
3 files changed, 16 insertions(+), 6 deletions(-)
diff --git a/gcc/ipa-icf.cc b/gcc/ipa-icf.cc
index 836d0914ded..bbdfd445397 100644
--- a/gcc/ipa-icf.cc
+++ b/gcc/ipa-icf.cc
@@ -218,6 +218,7 @@ sem_item::target_supports_symbol_aliases_p (void)
#if !defined (ASM_OUTPUT_DEF) || (!defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL))
return false;
#else
+ gcc_checking_assert (TARGET_SUPPORTS_ALIASES);
return true;
#endif
}
diff --git a/gcc/ipa-visibility.cc b/gcc/ipa-visibility.cc
index 8ec82bb333e..8ce56114ee3 100644
--- a/gcc/ipa-visibility.cc
+++ b/gcc/ipa-visibility.cc
@@ -622,7 +622,8 @@ function_and_variable_visibility (bool whole_program)
/* All aliases should be processed at this point. */
gcc_checking_assert (!alias_pairs || !alias_pairs->length ());
-#ifdef ASM_OUTPUT_DEF
+ if (TARGET_SUPPORTS_ALIASES)
+ {
FOR_EACH_DEFINED_FUNCTION (node)
{
if (node->get_availability () != AVAIL_INTERPOSABLE
@@ -643,7 +644,8 @@ function_and_variable_visibility (bool whole_program)
if (!alias)
{
- alias = dyn_cast<cgraph_node *> (node->noninterposable_alias ());
+ alias
+ = dyn_cast<cgraph_node *> (node->noninterposable_alias ());
gcc_assert (alias && alias != node);
}
@@ -656,7 +658,7 @@ function_and_variable_visibility (bool whole_program)
}
}
}
-#endif
+ }
FOR_EACH_FUNCTION (node)
{
diff --git a/gcc/varasm.cc b/gcc/varasm.cc
index 53f0cc61922..40d6081a3fa 100644
--- a/gcc/varasm.cc
+++ b/gcc/varasm.cc
@@ -4300,6 +4300,8 @@ output_constant_pool_contents (struct rtx_constant_pool *pool)
if (desc->mark < 0)
{
#ifdef ASM_OUTPUT_DEF
+ gcc_checking_assert (TARGET_SUPPORTS_ALIASES);
+
const char *name = XSTR (desc->sym, 0);
char label[256];
char buffer[256 + 32];
@@ -6225,6 +6227,10 @@ do_assemble_alias (tree decl, tree target)
IDENTIFIER_POINTER (id),
IDENTIFIER_POINTER (target));
# endif
+ /* If symbol aliases aren't actually supported... */
+ if (!TARGET_SUPPORTS_ALIASES)
+ /* ..., 'ASM_OUTPUT_DEF{,_FROM_DECLS}' better have raised an error. */
+ gcc_checking_assert (seen_error ());
#elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
{
const char *name;
@@ -6294,9 +6300,8 @@ assemble_alias (tree decl, tree target)
if (TREE_PUBLIC (decl))
error ("%qs symbol %q+D must have static linkage", "weakref", decl);
}
- else
+ else if (!TARGET_SUPPORTS_ALIASES)
{
-#if !defined (ASM_OUTPUT_DEF)
# if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
error_at (DECL_SOURCE_LOCATION (decl),
"alias definitions not supported in this configuration");
@@ -6317,7 +6322,7 @@ assemble_alias (tree decl, tree target)
return;
}
# endif
-#endif
+ gcc_unreachable ();
}
TREE_USED (decl) = 1;
@@ -7406,6 +7411,8 @@ default_strip_name_encoding (const char *str)
void
default_asm_output_anchor (rtx symbol)
{
+ gcc_checking_assert (TARGET_SUPPORTS_ALIASES);
+
char buffer[100];
sprintf (buffer, "*. + " HOST_WIDE_INT_PRINT_DEC,
--
2.34.1
