"Could not find return address on the stack!");
// It's a stub if there is an interrupt marker after the call.
- bool isStub = ((unsigned char*)RetAddr)[0] == 0xCD;
+ bool isStub = ((unsigned char*)RetAddr)[0] == 0xCE;
// The call instruction should have pushed the return value onto the stack...
#if defined (X86_64_JIT)
// If this is a stub, rewrite the call into an unconditional branch
// instruction so that two return addresses are not pushed onto the stack
// when the requested function finally gets called. This also makes the
- // 0xCD byte (interrupt) dead, so the marker doesn't effect anything.
+ // 0xCE byte (interrupt) dead, so the marker doesn't effect anything.
#if defined (X86_64_JIT)
// If the target address is within 32-bit range of the stub, use a
// PC-relative branch instead of loading the actual address. (This is
JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4);
#endif
- JCE.emitByte(0xCD); // Interrupt - Just a marker identifying the stub!
+ // This used to use 0xCD, but that value is used by JITMemoryManager to
+ // initialize the buffer with garbage, which means it may follow a
+ // noreturn function call, confusing X86CompilationCallback2. PR 4929.
+ JCE.emitByte(0xCE); // Interrupt - Just a marker identifying the stub!
return JCE.finishGVStub(F);
}