'[LLVMbugs] [Bug 19007] New: Destructor alias emission ignores calling convention'

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List:       llvm-bugs
Subject:    [LLVMbugs] [Bug 19007] New: Destructor alias emission ignores calling convention
From:       bugzilla-daemon () llvm ! org
Date:       2014-02-28 15:32:30
Message-ID: bug-19007-206 () http ! llvm ! org/bugs/
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--1393601551.B2aF3772.8223
Date: Fri, 28 Feb 2014 09:32:31 -0600
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Content-Type: text/plain; charset="UTF-8"

http://llvm.org/bugs/show_bug.cgi?id=19007

            Bug ID: 19007
           Summary: Destructor alias emission ignores calling convention
           Product: clang
           Version: trunk
          Hardware: PC
               URL: http://www.freebsd.org/cgi/query-pr.cgi?pr=187103
                OS: All
            Status: NEW
          Keywords: miscompilation
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs@nondot.org
          Reporter: benny.kra@gmail.com
                CC: llvmbugs@cs.uiuc.edu, rafael.espindola@gmail.com
    Classification: Unclassified

Here's a mildly insane test case reduced from mozilla.

$ cat t.cc
#define NS_CONSTRUCTOR_FASTCALL __attribute__ ((regparm (3), stdcall))

struct nsCOMPtr_base {
  NS_CONSTRUCTOR_FASTCALL ~nsCOMPtr_base() {}
};

struct nsCOMPtr : private nsCOMPtr_base {};

int main() {
  nsCOMPtr ptr;
}

$ clang -target i386-linux-gnu -O1 -Xclang -disable-llvm-optzns -flto -S -o -
t.cc
define i32 @main() #0 {
entry:
  %ptr = alloca %struct.nsCOMPtr, align 1
  call void bitcast (void (%struct.nsCOMPtr_base*)* @_ZN13nsCOMPtr_baseD2Ev to
void (%struct.nsCOMPtr*)*)(%struct.nsCOMPtr* %ptr)
  ret i32 0
}

define linkonce_odr x86_stdcallcc void
@_ZN13nsCOMPtr_baseD2Ev(%struct.nsCOMPtr_base* inreg %this)

Here we create a call to @_ZN13nsCOMPtr_baseD2Ev without adding the
x86_stdcallcc attribute to the call. The optimizer will turn this into a call
to @llvm.trap.

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--1393601551.B2aF3772.8223
Date: Fri, 28 Feb 2014 09:32:31 -0600
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<html>
    <head>
      <base href="http://llvm.org/bugs/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Destructor alias emission ignores calling convention"
   href="http://llvm.org/bugs/show_bug.cgi?id=19007">19007</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Destructor alias emission ignores calling convention
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>URL</th>
          <td>http://www.freebsd.org/cgi/query-pr.cgi?pr=187103
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Keywords</th>
          <td>miscompilation
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>LLVM Codegen
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs&#64;nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>benny.kra&#64;gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs&#64;cs.uiuc.edu, rafael.espindola&#64;gmail.com
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Here's a mildly insane test case reduced from mozilla.

$ cat t.cc
#define NS_CONSTRUCTOR_FASTCALL __attribute__ ((regparm (3), stdcall))

struct nsCOMPtr_base {
  NS_CONSTRUCTOR_FASTCALL ~nsCOMPtr_base() {}
};

struct nsCOMPtr : private nsCOMPtr_base {};

int main() {
  nsCOMPtr ptr;
}

$ clang -target i386-linux-gnu -O1 -Xclang -disable-llvm-optzns -flto -S -o -
t.cc
define i32 &#64;main() #0 {
entry:
  %ptr = alloca %struct.nsCOMPtr, align 1
  call void bitcast (void (%struct.nsCOMPtr_base*)* &#64;_ZN13nsCOMPtr_baseD2Ev to
void (%struct.nsCOMPtr*)*)(%struct.nsCOMPtr* %ptr)
  ret i32 0
}

define linkonce_odr x86_stdcallcc void
&#64;_ZN13nsCOMPtr_baseD2Ev(%struct.nsCOMPtr_base* inreg %this)

Here we create a call to &#64;_ZN13nsCOMPtr_baseD2Ev without adding the
x86_stdcallcc attribute to the call. The optimizer will turn this into a call
to &#64;llvm.trap.</pre>
        </div>
      </p>
      <hr>
      <span>You are receiving this mail because:</span>

      <ul>
          <li>You are on the CC list for the bug.</li>
      </ul>
    </body>
</html>

--1393601551.B2aF3772.8223--

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