diff options
Diffstat (limited to 'llvm/lib/VMCore/IntrinsicInst.cpp')
| -rw-r--r-- | llvm/lib/VMCore/IntrinsicInst.cpp | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/llvm/lib/VMCore/IntrinsicInst.cpp b/llvm/lib/VMCore/IntrinsicInst.cpp index e34cd5bbefd..ff00a49896d 100644 --- a/llvm/lib/VMCore/IntrinsicInst.cpp +++ b/llvm/lib/VMCore/IntrinsicInst.cpp @@ -2,10 +2,28 @@ // // The LLVM Compiler Infrastructure // -// This file was developed by the LLVM research group and is distributed under +// This file was developed by James M. Laskey and is distributed under // the University of Illinois Open Source License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// +// +// This file implements methods that make it really easy to deal with intrinsic +// functions with the isa/dyncast family of functions. In particular, this +// allows you to do things like: +// +// if (DbgStopPointInst *SPI = dyn_cast<DbgStopPointInst>(Inst)) +// ... SPI->getFileName() ... SPI->getDirectory() ... +// +// All intrinsic function calls are instances of the call instruction, so these +// are all subclasses of the CallInst class. Note that none of these classes +// has state or virtual methods, which is an important part of this gross/neat +// hack working. +// +// In some cases, arguments to intrinsics need to be generic and are defined as +// type pointer to empty struct { }*. To access the real item of interest the +// cast instruction needs to be stripped away. +// +//===----------------------------------------------------------------------===// #include "llvm/IntrinsicInst.h" |
