1 files changed, 116 insertions, 0 deletions
diff --git a/lib/Target/SparcV9/MachineCodeForInstruction.cpp b/lib/Target/SparcV9/MachineCodeForInstruction.cpp
new file mode 100644
index 0000000000..a3fc725468
--- /dev/null
+++ b/lib/Target/SparcV9/MachineCodeForInstruction.cpp
@@ -0,0 +1,116 @@
+//===-- 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.
+//
+//===----------------------------------------------------------------------===//
+//
+// Container for the sequence of MachineInstrs created for a single
+// LLVM Instruction.  MachineCodeForInstruction also tracks temporary values
+// (TmpInstruction objects) created during SparcV9 code generation, so that
+// they can be deleted when they are no longer needed, and finally, it also
+// holds some extra information for 'call' Instructions (using the
+// CallArgsDescriptor object, which is also implemented in this file).
+//
+//===----------------------------------------------------------------------===//
+
+#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"
+#include "SparcV9RegisterInfo.h"
+using namespace llvm;
+
+MachineCodeForInstruction &MachineCodeForInstruction::get(const Instruction *I){
+  MachineFunction &MF = MachineFunction::get(I->getParent()->getParent());
+  return MF.getInfo<SparcV9FunctionInfo>()->MCFIEntries[I];
+}
+
+void MachineCodeForInstruction::destroy(const Instruction *I) {
+  MachineFunction &MF = MachineFunction::get(I->getParent()->getParent());
+  MF.getInfo<SparcV9FunctionInfo>()->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);
+}
+
+/// CallArgsDescriptor::get - Mechanism to get the descriptor for a CALL
+/// MachineInstr.  We get the LLVM CallInst from the return-address register
+/// argument of the CALL MachineInstr (which is explicit operand #2 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 Value *retAddrVal = 0;
+  if ((MI->getOperand (0).getType () == MachineOperand::MO_MachineRegister
+       && MI->getOperand (0).getReg () == SparcV9::g0)
+      || (MI->getOperand (0).getType () == MachineOperand::MO_VirtualRegister
+          && !isa<Function> (MI->getOperand (0).getVRegValue ()))) {
+    retAddrVal = MI->getOperand (2).getVRegValue ();
+  } else {
+    retAddrVal = MI->getImplicitRef (MI->getNumImplicitRefs () - 1);
+  }
+
+  const TmpInstruction* retAddrReg = cast<TmpInstruction> (retAddrVal);
+  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;
+}