Do not use a class before it is defined.

[oota-llvm.git] / lib / CodeGen / MachineInstrAnnot.cpp

diff --git a/lib/CodeGen/MachineInstrAnnot.cpp b/lib/CodeGen/MachineInstrAnnot.cpp
index c5c0c3fe099e84ca58eaeab52db3b5f7da94834a..bf4e68e112fd2bbf07033ec5788c008a4781fb5f 100644 (file)
--- a/lib/CodeGen/MachineInstrAnnot.cpp
+++ b/lib/CodeGen/MachineInstrAnnot.cpp
@@ -1,29 +1,28 @@
-// $Id$ -*-c++-*-
-//***************************************************************************
-// File:
-//     MachineInstrAnnot.cpp
+//===-- MachineInstrAnnot.cpp ---------------------------------------------===//
 // 
-// Purpose:
-//      Annotations used to pass information between code generation phases.
+//                     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.
 // 
-// History:
-//     5/10/02  -  Vikram Adve  -  Created
-//**************************************************************************/
+//===----------------------------------------------------------------------===//
+// 
+//  This file defines Annotations used to pass information between code
+//  generation phases.
+// 
+//===----------------------------------------------------------------------===//
 
 #include "llvm/CodeGen/MachineInstrAnnot.h"
-#include "llvm/Annotation.h"
+#include "llvm/CodeGen/InstrSelection.h"
+#include "llvm/CodeGen/MachineCodeForInstruction.h"
 #include "llvm/iOther.h"
-#include <vector>
+#include "llvm/Type.h"
 
 
-AnnotationID CallArgsDescriptor::AID(AnnotationManager::
-                                     getID("CodeGen::CallArgsDescriptor"));
-
-CallArgsDescriptor::CallArgsDescriptor(const CallInst* _callInstr,
+CallArgsDescriptor::CallArgsDescriptor(CallInst* _callInstr,
                                        TmpInstruction* _retAddrReg,
                                        bool _isVarArgs, bool _noPrototype)
-  : Annotation(AID),
-    callInstr(_callInstr),
+  : callInstr(_callInstr),
     funcPtr(isa<Function>(_callInstr->getCalledValue())
             ? NULL : _callInstr->getCalledValue()),
     retAddrReg(_retAddrReg),
@@ -36,4 +35,44 @@ CallArgsDescriptor::CallArgsDescriptor(const CallInst* _callInstr,
          && "Operand 0 is ignored in the loop below!");
   for (unsigned int i=1; i < numArgs; ++i)
     argInfoVec.push_back(CallArgInfo(callInstr->getOperand(i)));
+
+  // Enter this object in the MachineCodeForInstr object of the CallInst.
+  // This transfers ownership of this object.
+  MachineCodeForInstruction::get(callInstr).setCallArgsDescriptor(this); 
+}
+
+
+CallInst*
+CallArgsDescriptor::getReturnValue() const
+{
+  return (callInstr->getType() == Type::VoidTy? NULL : callInstr);
+}
+
+
+// Mechanism to get the descriptor for a CALL MachineInstr.
+// We get the LLVM CallInstr from the ret. addr. register argument
+// of the CALL MachineInstr (which is explicit operand #3 for indirect
+// calls or the last implicit operand for direct calls).  We then get
+// the CallArgsDescriptor from the MachineCodeForInstruction object for
+// the CallInstr.
+// This is roundabout but avoids adding a new map or annotation just
+// to keep track of CallArgsDescriptors.
+// 
+CallArgsDescriptor *CallArgsDescriptor::get(const MachineInstr* MI)
+{
+  const TmpInstruction* retAddrReg =
+    cast<TmpInstruction>(isa<Function>(MI->getOperand(0).getVRegValue())
+                         ? MI->getImplicitRef(MI->getNumImplicitRefs()-1)
+                         : MI->getOperand(2).getVRegValue());
+
+  assert(retAddrReg->getNumOperands() == 1 &&
+         isa<CallInst>(retAddrReg->getOperand(0)) &&
+         "Location of callInstr arg for CALL instr. changed? FIX THIS CODE!");
+
+  const CallInst* callInstr = cast<CallInst>(retAddrReg->getOperand(0));
+
+  CallArgsDescriptor* desc =
+    MachineCodeForInstruction::get(callInstr).getCallArgsDescriptor(); 
+  assert(desc->getCallInst()==callInstr && "Incorrect call args descriptor?");
+  return desc;
 }