1 //===-- Interpreter.h - Abstract Execution Engine Interface -----*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file forces the interpreter to link in on certain operating systems.
11 // (Windows).
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef EXECUTION_ENGINE_INTERPRETER_H
16 #define EXECUTION_ENGINE_INTERPRETER_H
17 
18 #include "llvm/ExecutionEngine/ExecutionEngine.h"
19 #include <cstdlib>
20 
21 extern "C" void LLVMLinkInInterpreter();
22 
23 namespace {
24   struct ForceInterpreterLinking {
ForceInterpreterLinkingForceInterpreterLinking25     ForceInterpreterLinking() {
26       // We must reference the passes in such a way that compilers will not
27       // delete it all as dead code, even with whole program optimization,
28       // yet is effectively a NO-OP. As the compiler isn't smart enough
29       // to know that getenv() never returns -1, this will do the job.
30       if (std::getenv("bar") != (char*) -1)
31         return;
32 
33       LLVMLinkInInterpreter();
34     }
35   } ForceInterpreterLinking;
36 }
37 
38 #endif
39