-//===-- PrologEpilogCodeInserter.cpp - Insert Prolog & Epilog code for fn -===//
+//===-- SparcV9PrologEpilogCodeInserter.cpp - Insert Fn Prolog & Epilog ---===//
//
-// Insert SAVE/RESTORE instructions for the function
+// The LLVM Compiler Infrastructure
//
-// Insert prolog code at the unique function entry point.
-// Insert epilog code at each function exit point.
-// InsertPrologEpilog invokes these only if the function is not compiled
-// with the leaf function optimization.
+// 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 is the SparcV9 target's own PrologEpilogInserter. It creates prolog and
+// epilog instructions for functions which have not been compiled using "leaf
+// function optimizations". These instructions include the SAVE and RESTORE
+// instructions used to rotate the SPARC register windows. Prologs are
+// attached to the unique function entry, and epilogs are attached to each
+// function exit.
//
//===----------------------------------------------------------------------===//
-#include "SparcInternals.h"
-#include "SparcRegClassInfo.h"
-#include "llvm/CodeGen/MachineCodeForMethod.h"
-#include "llvm/CodeGen/MachineCodeForInstruction.h"
-#include "llvm/CodeGen/MachineInstr.h"
+#include "SparcV9Internals.h"
+#include "SparcV9RegClassInfo.h"
+#include "SparcV9RegisterInfo.h"
+#include "SparcV9FrameInfo.h"
+#include "MachineFunctionInfo.h"
+#include "MachineCodeForInstruction.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/Pass.h"
#include "llvm/Function.h"
-#include "llvm/BasicBlock.h"
-#include "llvm/Instruction.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Intrinsics.h"
+
+namespace llvm {
namespace {
+ struct InsertPrologEpilogCode : public MachineFunctionPass {
+ const char *getPassName() const { return "SparcV9 Prolog/Epilog Inserter"; }
-class InsertPrologEpilogCode : public MethodPass {
- TargetMachine &Target;
-public:
- InsertPrologEpilogCode(TargetMachine &T) : Target(T) {}
- bool runOnMethod(Function *F) {
- MachineCodeForMethod &mcodeInfo = MachineCodeForMethod::get(F);
- if (!mcodeInfo.isCompiledAsLeafMethod()) {
- InsertPrologCode(F);
- InsertEpilogCode(F);
+ bool runOnMachineFunction(MachineFunction &F) {
+ if (!F.getInfo<SparcV9FunctionInfo>()->isCompiledAsLeafMethod()) {
+ InsertPrologCode(F);
+ InsertEpilogCode(F);
+ }
+ return false;
}
- return false;
- }
- void InsertPrologCode(Function *F);
- void InsertEpilogCode(Function *F);
-};
+ void InsertPrologCode(MachineFunction &F);
+ void InsertEpilogCode(MachineFunction &F);
+ };
} // End anonymous namespace
-//------------------------------------------------------------------------
-// External Function: GetInstructionsForProlog
-// External Function: GetInstructionsForEpilog
-//
-// Purpose:
-// Create prolog and epilog code for procedure entry and exit
-//------------------------------------------------------------------------
+static unsigned getStaticStackSize (MachineFunction &MF) {
+ const TargetFrameInfo& frameInfo = *MF.getTarget().getFrameInfo();
+ unsigned staticStackSize = MF.getInfo<SparcV9FunctionInfo>()->getStaticStackSize();
+ if (staticStackSize < (unsigned)SparcV9FrameInfo::MinStackFrameSize)
+ staticStackSize = SparcV9FrameInfo::MinStackFrameSize;
+ if (unsigned padsz = staticStackSize %
+ SparcV9FrameInfo::StackFrameSizeAlignment)
+ staticStackSize += SparcV9FrameInfo::StackFrameSizeAlignment - padsz;
+ return staticStackSize;
+}
-void InsertPrologEpilogCode::InsertPrologCode(Function *F)
+void InsertPrologEpilogCode::InsertPrologCode(MachineFunction &MF)
{
- BasicBlock *entryBB = F->getEntryNode();
+ std::vector<MachineInstr*> mvec;
+ const TargetMachine &TM = MF.getTarget();
+ const TargetFrameInfo& frameInfo = *TM.getFrameInfo();
- vector<MachineInstr*> mvec;
- MachineInstr* M;
- const MachineFrameInfo& frameInfo = Target.getFrameInfo();
-
// The second operand is the stack size. If it does not fit in the
// immediate field, we have to use a free register to hold the size.
- // We will assume that local register `l0' is unused since the SAVE
- // instruction must be the first instruction in each procedure.
- //
- MachineCodeForMethod& mcInfo = MachineCodeForMethod::get(F);
- unsigned int staticStackSize = mcInfo.getStaticStackSize();
-
- if (staticStackSize < (unsigned) frameInfo.getMinStackFrameSize())
- staticStackSize = (unsigned) frameInfo.getMinStackFrameSize();
-
- if (unsigned padsz = (staticStackSize %
- (unsigned) frameInfo.getStackFrameSizeAlignment()))
- staticStackSize += frameInfo.getStackFrameSizeAlignment() - padsz;
-
- if (Target.getInstrInfo().constantFitsInImmedField(SAVE, staticStackSize))
- {
- M = new MachineInstr(SAVE);
- M->SetMachineOperandReg(0, Target.getRegInfo().getStackPointer());
- M->SetMachineOperandConst(1, MachineOperand::MO_SignExtendedImmed,
- - (int) staticStackSize);
- M->SetMachineOperandReg(2, Target.getRegInfo().getStackPointer());
- mvec.push_back(M);
- }
- else
- {
- M = new MachineInstr(SETSW);
- M->SetMachineOperandConst(0, MachineOperand::MO_SignExtendedImmed,
- - (int) staticStackSize);
- M->SetMachineOperandReg(1, MachineOperand::MO_MachineRegister,
- Target.getRegInfo().getUnifiedRegNum(
- Target.getRegInfo().getRegClassIDOfType(Type::IntTy),
- SparcIntRegOrder::l0));
- mvec.push_back(M);
-
- M = new MachineInstr(SAVE);
- M->SetMachineOperandReg(0, Target.getRegInfo().getStackPointer());
- M->SetMachineOperandReg(1, MachineOperand::MO_MachineRegister,
- Target.getRegInfo().getUnifiedRegNum(
- Target.getRegInfo().getRegClassIDOfType(Type::IntTy),
- SparcIntRegOrder::l0));
- M->SetMachineOperandReg(2, Target.getRegInfo().getStackPointer());
- mvec.push_back(M);
+ // See the comments below for the choice of this register.
+ unsigned staticStackSize = getStaticStackSize (MF);
+ int32_t C = - (int) staticStackSize;
+ int SP = TM.getRegInfo()->getStackPointer();
+ if (TM.getInstrInfo()->constantFitsInImmedField(V9::SAVEi,staticStackSize)) {
+ mvec.push_back(BuildMI(V9::SAVEi, 3).addMReg(SP).addSImm(C)
+ .addMReg(SP, MachineOperand::Def));
+ } else {
+ // We have to put the stack size value into a register before SAVE.
+ // Use register %g1 since it is volatile across calls. Note that the
+ // local (%l) and in (%i) registers cannot be used before the SAVE!
+ // Do this by creating a code sequence equivalent to:
+ // SETSW -(stackSize), %g1
+ int uregNum = TM.getRegInfo()->getUnifiedRegNum(
+ TM.getRegInfo()->getRegClassIDOfType(Type::IntTy),
+ SparcV9IntRegClass::g1);
+
+ MachineInstr* M = BuildMI(V9::SETHI, 2).addSImm(C)
+ .addMReg(uregNum, MachineOperand::Def);
+ M->getOperand(0).markHi32();
+ mvec.push_back(M);
+
+ M = BuildMI(V9::ORi, 3).addMReg(uregNum).addSImm(C)
+ .addMReg(uregNum, MachineOperand::Def);
+ M->getOperand(1).markLo32();
+ mvec.push_back(M);
+
+ M = BuildMI(V9::SRAi5, 3).addMReg(uregNum).addZImm(0)
+ .addMReg(uregNum, MachineOperand::Def);
+ mvec.push_back(M);
+
+ // Now generate the SAVE using the value in register %g1
+ M = BuildMI(V9::SAVEr,3).addMReg(SP).addMReg(uregNum)
+ .addMReg(SP,MachineOperand::Def);
+ mvec.push_back(M);
+ }
+
+ // For varargs function bodies, insert instructions to copy incoming
+ // register arguments for the ... list to the stack.
+ // The first K=6 arguments are always received via int arg regs
+ // (%i0 ... %i5 if K=6) .
+ // By copying the varargs arguments to the stack, va_arg() then can
+ // simply assume that all vararg arguments are in an array on the stack.
+ if (MF.getFunction()->getFunctionType()->isVarArg()) {
+ int numFixedArgs = MF.getFunction()->getFunctionType()->getNumParams();
+ int numArgRegs = TM.getRegInfo()->getNumOfIntArgRegs();
+ if (numFixedArgs < numArgRegs) {
+ const TargetFrameInfo &FI = *TM.getFrameInfo();
+ int firstArgReg = TM.getRegInfo()->getUnifiedRegNum(
+ TM.getRegInfo()->getRegClassIDOfType(Type::IntTy),
+ SparcV9IntRegClass::i0);
+ int fpReg = SparcV9::i6;
+ int argSize = 8;
+ int firstArgOffset= SparcV9FrameInfo::FirstIncomingArgOffsetFromFP;
+ int nextArgOffset = firstArgOffset + numFixedArgs * argSize;
+
+ for (int i=numFixedArgs; i < numArgRegs; ++i) {
+ mvec.push_back(BuildMI(V9::STXi, 3).addMReg(firstArgReg+i).
+ addMReg(fpReg).addSImm(nextArgOffset));
+ nextArgOffset += argSize;
+ }
}
+ }
- MachineCodeForBasicBlock& bbMvec = entryBB->getMachineInstrVec();
- bbMvec.insert(entryBB->getMachineInstrVec().begin(),
- mvec.begin(), mvec.end());
+ MF.front().insert(MF.front().begin(), mvec.begin(), mvec.end());
}
-void InsertPrologEpilogCode::InsertEpilogCode(Function *F)
+void InsertPrologEpilogCode::InsertEpilogCode(MachineFunction &MF)
{
- for (Function::iterator I = F->begin(), E = F->end(); I != E; ++I) {
- Instruction *TermInst = (Instruction*)(*I)->getTerminator();
+ const TargetMachine &TM = MF.getTarget();
+ const TargetInstrInfo &MII = *TM.getInstrInfo();
+
+ for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) {
+ MachineBasicBlock &MBB = *I;
+ const BasicBlock &BB = *I->getBasicBlock();
+ const Instruction *TermInst = (Instruction*)BB.getTerminator();
if (TermInst->getOpcode() == Instruction::Ret)
+ {
+ int ZR = TM.getRegInfo()->getZeroRegNum();
+ MachineInstr *Restore =
+ BuildMI(V9::RESTOREi, 3).addMReg(ZR).addSImm(0)
+ .addMReg(ZR, MachineOperand::Def);
+
+ MachineCodeForInstruction &termMvec =
+ MachineCodeForInstruction::get(TermInst);
+
+ // Remove the NOPs in the delay slots of the return instruction
+ unsigned numNOPs = 0;
+ while (termMvec.back()->getOpcode() == V9::NOP)
{
- BasicBlock* exitBB = *I;
-
- MachineInstr *Restore = new MachineInstr(RESTORE);
- Restore->SetMachineOperandReg(0, Target.getRegInfo().getZeroRegNum());
- Restore->SetMachineOperandConst(1, MachineOperand::MO_SignExtendedImmed,
- (int64_t)0);
- Restore->SetMachineOperandReg(2, Target.getRegInfo().getZeroRegNum());
-
- MachineCodeForBasicBlock& bbMvec = exitBB->getMachineInstrVec();
- MachineCodeForInstruction &termMvec =
- MachineCodeForInstruction::get(TermInst);
-
- // Remove the NOPs in the delay slots of the return instruction
- const MachineInstrInfo &mii = Target.getInstrInfo();
- unsigned numNOPs = 0;
- while (termMvec.back()->getOpCode() == NOP)
- {
- assert( termMvec.back() == bbMvec.back());
- delete bbMvec.pop_back();
- termMvec.pop_back();
- ++numNOPs;
- }
- assert(termMvec.back() == bbMvec.back());
-
- // Check that we found the right number of NOPs and have the right
- // number of instructions to replace them.
- unsigned ndelays = mii.getNumDelaySlots(termMvec.back()->getOpCode());
- assert(numNOPs == ndelays && "Missing NOPs in delay slots?");
- assert(ndelays == 1 && "Cannot use epilog code for delay slots?");
-
- // Append the epilog code to the end of the basic block.
- bbMvec.push_back(Restore);
+ assert( termMvec.back() == &MBB.back());
+ termMvec.pop_back();
+ MBB.erase(&MBB.back());
+ ++numNOPs;
}
+ assert(termMvec.back() == &MBB.back());
+
+ // Check that we found the right number of NOPs and have the right
+ // number of instructions to replace them.
+ unsigned ndelays = MII.getNumDelaySlots(termMvec.back()->getOpcode());
+ assert(numNOPs == ndelays && "Missing NOPs in delay slots?");
+ assert(ndelays == 1 && "Cannot use epilog code for delay slots?");
+
+ // Append the epilog code to the end of the basic block.
+ MBB.push_back(Restore);
+ }
}
}
-Pass *createPrologEpilogCodeInserter(TargetMachine &TM) {
- return new InsertPrologEpilogCode(TM);
+FunctionPass *createPrologEpilogInsertionPass() {
+ return new InsertPrologEpilogCode();
}
+
+} // End llvm namespace
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