Moved this file out of lib/CodeGen

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15837 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/SparcV9/MachineCodeForInstruction.cpp

@@ -0,0 +1,119 @@
+//===-- MachineCodeForInstruction.cpp -------------------------------------===//
+// 
+//                     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.
+// 
+//===----------------------------------------------------------------------===//
+//
+// Representation of the sequence of machine instructions created for a single
+// VM instruction.  Additionally records information about hidden and implicit
+// values used by the machine instructions: about hidden values used by the
+// machine instructions:
+// 
+// "Temporary values" are intermediate values used in the machine instruction
+// sequence, but not in the VM instruction. Note that such values should be
+// treated as pure SSA values with no interpretation of their operands (i.e., as
+// a TmpInstruction object which actually represents such a value).
+// 
+// (2) "Implicit uses" are values used in the VM instruction but not in the
+//     machine instruction sequence
+// 
+//===----------------------------------------------------------------------===//
+
+#include "MachineCodeForInstruction.h"
+#include "llvm/Function.h"
+#include "llvm/Instructions.h"
+#include "llvm/Type.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "MachineFunctionInfo.h"
+#include "MachineInstrAnnot.h"
+#include "SparcV9TmpInstr.h"
+using namespace llvm;
+
+MachineCodeForInstruction &MachineCodeForInstruction::get(const Instruction *I){
+  MachineFunction &MF = MachineFunction::get(I->getParent()->getParent());
+  return MF.getInfo()->MCFIEntries[I];
+}
+void MachineCodeForInstruction::destroy(const Instruction *I) {
+  MachineFunction &MF = MachineFunction::get(I->getParent()->getParent());
+  MF.getInfo()->MCFIEntries.erase(I);
+}
+
+void
+MachineCodeForInstruction::dropAllReferences()
+{
+  for (unsigned i=0, N=tempVec.size(); i < N; i++)
+    cast<Instruction>(tempVec[i])->dropAllReferences();
+}
+
+
+MachineCodeForInstruction::~MachineCodeForInstruction() {
+  // Let go of all uses in temp. instructions
+  dropAllReferences();
+  
+  // Free the Value objects created to hold intermediate values
+  for (unsigned i=0, N=tempVec.size(); i < N; i++)
+    delete tempVec[i];
+  
+  // do not free the MachineInstr objects allocated. they are managed
+  // by the ilist in MachineBasicBlock
+
+  // Free the CallArgsDescriptor if it exists.
+  delete callArgsDesc;
+}
+
+
+CallArgsDescriptor::CallArgsDescriptor(CallInst* _callInstr,
+                                       TmpInstruction* _retAddrReg,
+                                       bool _isVarArgs, bool _noPrototype)
+  : callInstr(_callInstr),
+    funcPtr(isa<Function>(_callInstr->getCalledValue())
+            ? NULL : _callInstr->getCalledValue()),
+    retAddrReg(_retAddrReg),
+    isVarArgs(_isVarArgs),
+    noPrototype(_noPrototype) {
+  unsigned int numArgs = callInstr->getNumOperands();
+  argInfoVec.reserve(numArgs);
+  assert(callInstr->getOperand(0) == callInstr->getCalledValue()
+         && "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;
+}