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Date: Thu, 02 Oct 2008 20:46:00 -0000
Subject: [Bug c++/37722]  New: destructors not called on computed goto
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From: "cburger at sunysb dot edu" <gcc-bugzilla@gcc.gnu.org>
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#include <iostream>

struct foo {
    foo() { std::cout << "foo constructed\n"; }
   ~foo() { std::cout << "foo destructed\n"; }
};

enum opcode { NOP, FOO, DONE };

void exec0(const opcode* o) {
    loop: switch (*o) {
        case NOP:          ++o; goto loop;
        case FOO: { foo f; ++o; goto loop; } // f destructed
        case DONE:  return;
    }
}

void exec1(const opcode* o) {
    static void* label[] = { &&NOP, &&FOO, &&DONE };
    goto *label[*o];
    NOP:          ++o;   goto *label[*o];
    FOO: { foo f; ++o;   goto *label[*o]; } // f not destructed
//  FOO: { foo f; ++o; } goto *label[*o];   // work-around
    DONE:  return;
}

int main() {
    const opcode program[] = { NOP, FOO, NOP, NOP, DONE };
    exec0(program);
    exec1(program);
    return 0;
}

Output:
foo constructed
foo destructed
foo constructed

Tested with: 4.3.2, 4.2.4, 4.1.3, 3.4.6
Optimization level makes no difference.
Intel icpc 10.1, 9.1 show the same problem.


-- 
           Summary: destructors not called on computed goto
           Product: gcc
           Version: 4.3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: cburger at sunysb dot edu
 GCC build triplet: x86_64-linux-gnu
  GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37722