[LLVMbugs] [Bug 273] NEW: [llvm-gcc] "Address of label" GCC extension not implemented

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=273

           Summary: [llvm-gcc] "Address of label" GCC extension not
                    implemented
           Product: tools
           Version: 1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: minor
          Priority: P2
         Component: llvm-gcc
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sabre at nondot.org


This is just a tracking bug that points out that we don't currently support the
'address of a label' GCC extension.  This extension is often used to make
'threaded' interpreters.   It would be good to support this eventually.

Here's a simple example:

---
int code[]={0,0,0,0,1};
void foo(int x) {
  volatile int b;
  b = 0xffffffff;
}
void bar(int *pc) {
  static const void *l[] = {&&lab0, &&end};

  foo(0);
  goto *l[*pc];
 lab0:
  foo(0);
  pc++;
  goto *l[*pc];
 end:
  return;
}
int main() {
  bar(code);
  return 0;
}
---

-Chris



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