[llvm-commits] CVS: llvm/lib/Target/SparcV9/MachineCodeForInstruction.cpp

[Chris Lattner]

Changes in directory llvm/lib/Target/SparcV9:

MachineCodeForInstruction.cpp added (r1.1)
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Log message:

Moved this file out of lib/CodeGen


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Diffs of the changes:  (+119 -0)

Index: llvm/lib/Target/SparcV9/MachineCodeForInstruction.cpp
diff -c /dev/null llvm/lib/Target/SparcV9/MachineCodeForInstruction.cpp:1.1
*** /dev/null	Mon Aug 16 17:38:12 2004
--- llvm/lib/Target/SparcV9/MachineCodeForInstruction.cpp	Mon Aug 16 17:38:02 2004
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*** 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;
+ }