//===-- 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 "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 "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()->getStaticStackSize();
-
+ unsigned staticStackSize = MF.getInfo<SparcV9FunctionInfo>()->getStaticStackSize();
if (staticStackSize < (unsigned)SparcV9FrameInfo::MinStackFrameSize)
staticStackSize = SparcV9FrameInfo::MinStackFrameSize;
- if (unsigned padsz = staticStackSize %
+ if (unsigned padsz = staticStackSize %
SparcV9FrameInfo::StackFrameSizeAlignment)
staticStackSize += SparcV9FrameInfo::StackFrameSizeAlignment - padsz;
-
return staticStackSize;
}
std::vector<MachineInstr*> mvec;
const TargetMachine &TM = MF.getTarget();
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 = getStaticStackSize (MF);
int32_t C = - (int) staticStackSize;
int SP = TM.getRegInfo()->getStackPointer();
.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);
// 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();
if (TermInst->getOpcode() == Instruction::Ret)
{
int ZR = TM.getRegInfo()->getZeroRegNum();
- MachineInstr *Restore =
+ 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)
++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);
}
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