-//===-- PrologEpilogCodeInserter.cpp - Insert Prolog & Epilog code for fn -===//
+//===-- SparcV9PrologEpilogCodeInserter.cpp - Insert Fn Prolog & Epilog ---===//
+//
+// The LLVM Compiler Infrastructure
//
-// Insert SAVE/RESTORE instructions for the function
+// 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.
+//
+//===----------------------------------------------------------------------===//
//
-// 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 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 "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/MachineFunctionInfo.h"
-#include "llvm/CodeGen/MachineCodeForInstruction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
-#include "llvm/CodeGen/InstrSelectionSupport.h"
#include "llvm/Pass.h"
#include "llvm/Function.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Intrinsics.h"
+
+namespace llvm {
namespace {
struct InsertPrologEpilogCode : public MachineFunctionPass {
- const char *getPassName() const { return "Sparc Prolog/Epilog Inserter"; }
+ const char *getPassName() const { return "SparcV9 Prolog/Epilog Inserter"; }
bool runOnMachineFunction(MachineFunction &F) {
- if (!F.getInfo()->isCompiledAsLeafMethod()) {
+ if (!F.getInfo<SparcV9FunctionInfo>()->isCompiledAsLeafMethod()) {
InsertPrologCode(F);
InsertEpilogCode(F);
}
} // End anonymous namespace
-//------------------------------------------------------------------------
-// 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(MachineFunction &MF)
{
std::vector<MachineInstr*> mvec;
const TargetMachine &TM = MF.getTarget();
- const TargetFrameInfo& frameInfo = TM.getFrameInfo();
+ const TargetFrameInfo& frameInfo = *TM.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.
// See the comments below for the choice of this register.
- //
- unsigned staticStackSize = MF.getInfo()->getStaticStackSize();
-
- if (staticStackSize < (unsigned) frameInfo.getMinStackFrameSize())
- staticStackSize = (unsigned) frameInfo.getMinStackFrameSize();
-
- if (unsigned padsz = (staticStackSize %
- (unsigned) frameInfo.getStackFrameSizeAlignment()))
- staticStackSize += frameInfo.getStackFrameSizeAlignment() - padsz;
-
+ unsigned staticStackSize = getStaticStackSize (MF);
int32_t C = - (int) staticStackSize;
- int SP = TM.getRegInfo().getStackPointer();
- if (TM.getInstrInfo().constantFitsInImmedField(SAVE, staticStackSize)) {
- mvec.push_back(BuildMI(SAVE, 3).addMReg(SP).addSImm(C).addMReg(SP));
+ 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),
- SparcIntRegClass::g1);
+ int uregNum = TM.getRegInfo()->getUnifiedRegNum(
+ TM.getRegInfo()->getRegClassIDOfType(Type::IntTy),
+ SparcV9IntRegClass::g1);
- MachineInstr* M = BuildMI(SETHI, 2).addSImm(C).addMReg(uregNum);
- M->setOperandHi32(0);
+ MachineInstr* M = BuildMI(V9::SETHI, 2).addSImm(C)
+ .addMReg(uregNum, MachineOperand::Def);
+ M->getOperand(0).markHi32();
mvec.push_back(M);
- M = BuildMI(OR, 3).addMReg(uregNum).addSImm(C).addMReg(uregNum);
- M->setOperandLo32(1);
+ M = BuildMI(V9::ORi, 3).addMReg(uregNum).addSImm(C)
+ .addMReg(uregNum, MachineOperand::Def);
+ M->getOperand(1).markLo32();
mvec.push_back(M);
- M = BuildMI(SRA, 3).addMReg(uregNum).addZImm(0).addMReg(uregNum);
+ 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(SAVE, 3).addMReg(SP).addMReg(uregNum).addMReg(SP);
+ 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;
+ }
+ }
+ }
+
MF.front().insert(MF.front().begin(), mvec.begin(), mvec.end());
}
void InsertPrologEpilogCode::InsertEpilogCode(MachineFunction &MF)
{
const TargetMachine &TM = MF.getTarget();
- const TargetInstrInfo &MII = TM.getInstrInfo();
+ const TargetInstrInfo &MII = *TM.getInstrInfo();
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) {
MachineBasicBlock &MBB = *I;
- BasicBlock &BB = *I->getBasicBlock();
- Instruction *TermInst = (Instruction*)BB.getTerminator();
+ 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)
{
- int ZR = TM.getRegInfo().getZeroRegNum();
- MachineInstr *Restore =
- BuildMI(RESTORE, 3).addMReg(ZR).addSImm(0).addMReg(ZR);
-
- MachineCodeForInstruction &termMvec =
- MachineCodeForInstruction::get(TermInst);
-
- // Remove the NOPs in the delay slots of the return instruction
- unsigned numNOPs = 0;
- while (termMvec.back()->getOpCode() == NOP)
- {
- assert( termMvec.back() == MBB.back());
- delete MBB.pop_back();
- termMvec.pop_back();
- ++numNOPs;
- }
- assert(termMvec.back() == MBB.back());
+ 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?");
+ // 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);
- }
+ // Append the epilog code to the end of the basic block.
+ MBB.push_back(Restore);
+ }
}
}
-Pass* UltraSparc::getPrologEpilogInsertionPass() {
+FunctionPass *createPrologEpilogInsertionPass() {
return new InsertPrologEpilogCode();
}
+
+} // End llvm namespace