-//===-- PrologEpilogCodeInserter.cpp - Insert Prolog & Epilog code for fn -===//
-//
+//===-- SparcV9PrologEpilogCodeInserter.cpp - Insert Fn Prolog & Epilog ---===//
+//
// 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.
-//
-//===----------------------------------------------------------------------===//
//
-// Insert SAVE/RESTORE instructions for the function
+//===----------------------------------------------------------------------===//
//
-// 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/Pass.h"
#include "llvm/Function.h"
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);
}
return false;
}
-
+
void InsertPrologCode(MachineFunction &F);
void InsertEpilogCode(MachineFunction &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(V9::SAVEi,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, MOTy::Def));
+ .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(V9::SETHI, 2).addSImm(C)
- .addMReg(uregNum, MOTy::Def);
- M->setOperandHi32(0);
+ .addMReg(uregNum, MachineOperand::Def);
+ M->getOperand(0).markHi32();
mvec.push_back(M);
-
+
M = BuildMI(V9::ORi, 3).addMReg(uregNum).addSImm(C)
- .addMReg(uregNum, MOTy::Def);
- M->setOperandLo32(1);
+ .addMReg(uregNum, MachineOperand::Def);
+ M->getOperand(1).markLo32();
mvec.push_back(M);
-
+
M = BuildMI(V9::SRAi5, 3).addMReg(uregNum).addZImm(0)
- .addMReg(uregNum, MOTy::Def);
+ .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,MOTy::Def);
+ M = BuildMI(V9::SAVEr,3).addMReg(SP).addMReg(uregNum)
+ .addMReg(SP,MachineOperand::Def);
mvec.push_back(M);
}
// 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.
- //
+ // 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();
+ int numArgRegs = TM.getRegInfo()->getNumOfIntArgRegs();
if (numFixedArgs < numArgRegs) {
- bool ignore;
- int firstArgReg = TM.getRegInfo().getUnifiedRegNum(
- TM.getRegInfo().getRegClassIDOfType(Type::IntTy),
- SparcIntRegClass::i0);
- int fpReg = TM.getFrameInfo().getIncomingArgBaseRegNum();
- int argSize = TM.getFrameInfo().getSizeOfEachArgOnStack();
- int firstArgOffset=TM.getFrameInfo().getFirstIncomingArgOffset(MF,ignore);
+ 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) {
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;
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, MOTy::Def);
-
+ 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)
+ while (termMvec.back()->getOpcode() == V9::NOP)
{
- assert( termMvec.back() == MBB.back());
- delete MBB.pop_back();
+ assert( termMvec.back() == &MBB.back());
termMvec.pop_back();
+ MBB.erase(&MBB.back());
++numNOPs;
}
- assert(termMvec.back() == MBB.back());
-
+ 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());
+ 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);
}
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