[Bug c/31782] New: Invalid assembly code on initial dollar signs

[Bug c/31782] New: Invalid assembly code on initial dollar signs

[truedfx at gentoo dot org]

Hi,

This code compiles fine with gcc:

void a$() {}
int main() { a$(); }

This generates invalid assembly code:

void $() {}
int main() { $(); }

To gas, an initial $ is not allowed in an identifier, but to gcc, it is, so gcc
can't simply copy the function name to the assembly output, unless $ also
becomes an invalid identifier in C.

The code can, of course, compile successfully with -fleading-underscore.


-- 
           Summary: Invalid assembly code on initial dollar signs
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: truedfx at gentoo dot org
  GCC host triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

[Bug c/31782] Invalid assembly code on initial dollar signs

[truedfx at gentoo dot org]

------- Comment #1 from truedfx at gentoo dot org  2007-05-02 03:21 -------
Sorry, forgot to mention, I'm using gcc 4.1.2 with binutils 2.17, and I also
tried gcc 3.3.6 with binutils 2.16.1, which behaves the same for me.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

[Bug target/31782] Invalid assembly code on initial dollar signs

[pinskia at gcc dot gnu dot org]

------- Comment #2 from pinskia at gcc dot gnu dot org  2007-05-02 03:33 -------
> unless $ also becomes an invalid identifier in C.

Well read:
http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Dollar-Signs.html

it is can be but does not have to be.

This works for me targetting spu-elf and powerpc64-linux-gnu (with -m32 and
-m64) so this is a target issue.  Really I think this is a bug in binutils for
i386/x86_64 (I can reproduce it there).


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c                           |target
   GCC host triplet|x86_64-pc-linux-gnu         |
 GCC target triplet|                            |x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

[Bug target/31782] Invalid assembly code on initial dollar signs

[truedfx at gentoo dot org]

------- Comment #3 from truedfx at gentoo dot org  2007-05-02 05:58 -------
Thanks for the link. I don't see how GAS could be fixed, though. How would the
assembler tell the difference between $0 the constant and $0 the identifier?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

[Bug target/31782] Invalid assembly code on initial dollar signs

[joseph at codesourcery dot com]

------- Comment #4 from joseph at codesourcery dot com  2007-05-02 12:58 -------
Subject: Re:  Invalid assembly code on initial dollar signs

On Wed, 2 May 2007, truedfx at gentoo dot org wrote:

> Thanks for the link. I don't see how GAS could be fixed, though. How would the
> assembler tell the difference between $0 the constant and $0 the identifier?

ELF supports arbitrary (possibly empty) sequences of non-NUL bytes as 
symbol names.  GAS should, in principle, provide an escaping mechanism for 
assembly files to represent all such names.  GCC should use that escaping 
mechanism as required.  (It's arguable whether such escaping should be 
applied to asm names given to variables or whether it's the user's 
responsibility to include the escaping in the string passed to asm in that 
case.)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

[Bug target/31782] Invalid assembly code on initial dollar signs

[funto66 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

funto66 at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |funto66 at gmail dot com

--- Comment #5 from funto66 at gmail dot com 2011-02-04 16:42:33 UTC ---
I think this is the same bug that I got :
- this code compiles :
#include <stdio.h>
int main(int argc, char* argv[])
{
    int $a = 0;
    for($a = 0 ; $a < 10 ; $a++)
        printf("%d\n", $a);

    return 0;
}


- this one doesn't :
#include <stdio.h>
int main(int argc, char* argv[])
{
    static const char* $tr = "Hello World !\n";
    int i=0;

    for(;$tr[i] != '\0' ; i++)
        fputc($tr[i], stdout);

    return 0;
}

Version used: gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5)

[Bug target/31782] Invalid assembly code on initial dollar signs

[raphael.jakse at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

Raphaël JAKSE <raphael.jakse at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |raphael.jakse at gmail dot com

--- Comment #6 from Raphaël JAKSE <raphael.jakse at gmail dot com> ---
New information on this bug:

With gcc version 4.8.3-3 on Debian x86-64 targeting x86_64-linux-gnu, trying to
get the assembly version of the following code with gcc -S:

void $() {}
void a() { $(); }

I get:

[...]
    call    $
[...]

With clang, I get:


[...]
    callq    ($)
[...]

Making the corresponding object file of this code with gcc -c
 - succeed with the assembly code generated by clang
 - fails with the assembly code generated by gcc with the following message:
     t.c: Assembler messages:
     t.c:30: Error: missing or invalid immediate expression `'

Adding parentheses in the assembly code generated by gcc:
 call    $ → call    ($)

make the object file generation succeed.

Clang seems to add parentheses whenever the function name starts with a dollar
sign ($).
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Subject: [Bug target/61503] RTL representation of i386 shrdl instruction is incorrect?
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida503

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
Author: glisse
Date: Sun Jun 22 09:16:35 2014
New Revision: 211873

URL: https://gcc.gnu.org/viewcvs?rev!1873&root=gcc&view=rev
Log:
2014-06-22  Marc Glisse  <marc.glisse@inria.fr>

    PR target/61503
    * config/i386/i386.md (x86_64_shrd, x86_shrd,
    ix86_rotr<dwi>3_doubleword): Replace ashiftrt with lshiftrt.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.md

[Bug target/31782] Invalid assembly code on initial dollar signs

[harald at gigawatt dot nl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

--- Comment #7 from Harald van Dijk <harald at gigawatt dot nl> ---
That's good to know. Trying some more, clang does manage to get even weirder
symbol names right, because gas does have a form of quoting already, and clang
makes use of it.

int x __asm__(")");
int main() { return x; }

With clang, this works.

...
        movl    ")", %eax
...
        .type   ")",@object             # @")"
        .comm   ")",4,4
...

If it's simpler to implement, then instead of parenthesising, $ could
alternatively be treated as a symbol that needs quoting, which is a more
general solution that will work for any possible symbol name.

[Bug target/31782] Invalid assembly code on initial dollar signs

[raphael.jakse at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

--- Comment #8 from Raphaël JAKSE <raphael.jakse at gmail dot com> ---
I tried
    call    "$"

instead of
    call    ($)

With gcc -S, I got :

t.s: Assembler messages:
t.s:30: Error: invalid character `"' before operand 1

I don't know if there is a way to use quoting (" ") instead of parenthesizing).
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Subject: [Bug c++/61584] What defines std::underlying_type?
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61584

--- Comment #2 from David Krauss <potswa at mac dot com> ---
C "compatible type" determines integer conversion rank (C11 §6.3.1.1). C++
fixes the rank by a heuristic which the implementation cannot decide (C++11
§4.5/3).

Currently, enum promotions are incompatible between C and C++ modes.
Furthermore, when C++ requires promotion to signed int but the underlying type
is unsigned int, integer overflow may occur.

I think this adds up to a bug and the C++ behavior should get its own bullet at
the end of that manual page.
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Subject: [Bug bootstrap/61583] [4.9/4.10 regression] stage2 and stage3 compare failure due to value range loss
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida583

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Preapproved with proper ChangeLog entry and if possible some testcase (with
-fcompare-debug in dg-options).

[Bug target/31782] Invalid assembly code on initial dollar signs

[harald at gigawatt dot nl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

--- Comment #9 from Harald van Dijk <harald at gigawatt dot nl> ---
Oh, very sorry about that, I hadn't realised clang stopped using gas. clang
uses its own assembler now, which supports quoted names this as a syntax
extension. Now that there is a possible syntax already, perhaps that will be
easier to bring to gas.

gas does indeed seem to properly handle your suggestion of parenthesised
identifiers on x86-64 already, even if they have names such as $0 (unlike
clang's assembler, oddly). However, I do worry that this may be too brittle,
because of other systems (even using gas) where $ is used more extensively in
standard syntax, such as register names, where parentheses cannot be used to
force interpretation as a symbol name because register names may also be
parenthesised.

[Bug target/31782] Invalid assembly code on initial dollar signs

[raphael.jakse at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

--- Comment #10 from Raphaël JAKSE <raphael.jakse at gmail dot com> ---
So, a long term solution would be to allow quoted function names with the call
instruction in gas?
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Subject: [Bug tree-optimization/61572] [4.10 Regression] ICE: in assign_by_spills, at lra-assigns.c:1335
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida572

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
          Component|rtl-optimization            |tree-optimization
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
That's because of

       register __typeof__(0) c asm("rdx");

which AFAIK makes 'rdx' "fixed" in the whole function.

What changed recently is that we sunk the b = c; assignment right before
its use.  Not doing that fixes the issue (but I wonder if the use of
that asm isn't undefined from the start).

Note that we still happily sink stores to hard registers (that probably
always reduces hardreg lifetime).

Index: tree-ssa-sink.c
==================================================================--- tree-ssa-sink.c     (revision 211928)
+++ tree-ssa-sink.c     (working copy)
@@ -374,6 +374,12 @@ statement_sink_location (gimple stmt, ba
         nearest to commondom.  */
       if (gimple_vuse (stmt))
        {
+         /* Do not sink loads from hard registers.  */
+         if (gimple_assign_single_p (stmt)
+             && TREE_CODE (gimple_assign_rhs1 (stmt)) == VAR_DECL
+             && DECL_HARD_REGISTER (gimple_assign_rhs1 (stmt)))
+           return false;
+
          imm_use_iterator imm_iter;
          use_operand_p use_p;
          basic_block found = NULL;

[Bug target/31782] Invalid assembly code on initial dollar signs

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-07-29
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.

[Bug target/31782] Invalid assembly code on initial dollar signs

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rwxr-xr-x at gmx dot de

--- Comment #12 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 52554 has been marked as a duplicate of this bug. ***

[Bug target/31782] Invalid assembly code on initial dollar signs

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kerrg at ccs dot neu.edu

--- Comment #13 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 46163 has been marked as a duplicate of this bug. ***

[Bug target/31782] Invalid assembly code on initial dollar signs

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |greened at obbligato dot org

--- Comment #14 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 45591 has been marked as a duplicate of this bug. ***

[Bug target/31782] Invalid assembly code on initial dollar signs

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31782

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |DUPLICATE
             Status|NEW                         |RESOLVED

--- Comment #15 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 91298 .

*** This bug has been marked as a duplicate of bug 91298 ***