1 //===-- IntrinsicLowering.cpp - Intrinsic Lowering default implementation -===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the default intrinsic lowering implementation.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/IntrinsicLowering.h"
15 #include "llvm/Constant.h"
16 #include "llvm/Module.h"
17 #include "llvm/Type.h"
18 #include "llvm/iOther.h"
21 void DefaultIntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
22 Function *Callee = CI->getCalledFunction();
23 assert(Callee && "Cannot lower an indirect call!");
25 Module *M = Callee->getParent();
27 switch (Callee->getIntrinsicID()) {
28 case Intrinsic::not_intrinsic:
29 std::cerr << "Cannot lower a call to a non-intrinsic function '"
30 << Callee->getName() << "'!\n";
33 std::cerr << "Error: Code generator does not support intrinsic function '"
34 << Callee->getName() << "'!\n";
37 // The default implementation of setjmp/longjmp transforms setjmp into a
38 // noop that always returns zero and longjmp into a call to abort. This
39 // allows code that never longjmps to work correctly.
40 case Intrinsic::setjmp:
41 case Intrinsic::sigsetjmp:
42 if (CI->getType() != Type::VoidTy)
43 CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
46 case Intrinsic::longjmp:
47 case Intrinsic::siglongjmp:
48 // Insert the call to abort
49 new CallInst(M->getOrInsertFunction("abort", Type::VoidTy, 0), "", CI);
52 case Intrinsic::dbg_stoppoint:
53 case Intrinsic::dbg_region_start:
54 case Intrinsic::dbg_region_end:
55 case Intrinsic::dbg_declare:
56 case Intrinsic::dbg_func_start:
57 if (CI->getType() != Type::VoidTy)
58 CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
59 break; // Simply strip out debugging intrinsics
62 assert(CI->use_empty() &&
63 "Lowering should have eliminated any uses of the intrinsic call!");
64 CI->getParent()->getInstList().erase(CI);