s/isReturnStruct()/hasStructRetAttr()/g

[oota-llvm.git] / lib / VMCore / IntrinsicInst.cpp

diff --git a/lib/VMCore/IntrinsicInst.cpp b/lib/VMCore/IntrinsicInst.cpp
index e34cd5bbefd4bc8889e1c8e0728760cb4250fc4b..fb7a74b5f779b0dada9de28efb5ba764caa19eed 100644 (file)
--- a/lib/VMCore/IntrinsicInst.cpp
+++ b/lib/VMCore/IntrinsicInst.cpp
@@ -2,16 +2,33 @@
 //
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file 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"
-
 #include "llvm/Constants.h"
 #include "llvm/GlobalVariable.h"
-
+#include "llvm/CodeGen/MachineModuleInfo.h"
 using namespace llvm;
 
 //===----------------------------------------------------------------------===//
@@ -20,20 +37,20 @@ using namespace llvm;
 
 static Value *CastOperand(Value *C) {
   if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
-    if (CE->getOpcode() == Instruction::Cast)
+    if (CE->isCast())
       return CE->getOperand(0);
   return NULL;
 }
 
 Value *DbgInfoIntrinsic::StripCast(Value *C) {
   if (Value *CO = CastOperand(C)) {
-      return StripCast(CO);
+    C = StripCast(CO);
   } else if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
     if (GV->hasInitializer())
       if (Value *CO = CastOperand(GV->getInitializer()))
-        return StripCast(CO);
+        C = StripCast(CO);
   }
-  return C;
+  return dyn_cast<GlobalVariable>(C);
 }
 
 //===----------------------------------------------------------------------===//
@@ -41,15 +58,23 @@ Value *DbgInfoIntrinsic::StripCast(Value *C) {
 ///
 
 std::string DbgStopPointInst::getFileName() const {
+  // Once the operand indices are verified, update this assert
+  assert(LLVMDebugVersion == (6 << 16) && "Verify operand indices");
   GlobalVariable *GV = cast<GlobalVariable>(getContext());
+  if (!GV->hasInitializer()) return "";
   ConstantStruct *CS = cast<ConstantStruct>(GV->getInitializer());
-  return CS->getOperand(4)->getStringValue();
+  return CS->getOperand(3)->getStringValue();
 }
 
 std::string DbgStopPointInst::getDirectory() const {
+  // Once the operand indices are verified, update this assert
+  assert(LLVMDebugVersion == (6 << 16) && "Verify operand indices");
   GlobalVariable *GV = cast<GlobalVariable>(getContext());
+  if (!GV->hasInitializer()) return "";
   ConstantStruct *CS = cast<ConstantStruct>(GV->getInitializer());
-  return CS->getOperand(5)->getStringValue();
+  return CS->getOperand(4)->getStringValue();
 }
 
 //===----------------------------------------------------------------------===//
+/// Ensure that users of IntrinsicInst.h will link with this module.
+DEFINING_FILE_FOR(IntrinsicInst)