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* Move InsertPrologEpilogCode class to PrologEpilogCodeInserter.cpp
   -> Among other things, this eliminates the need for the minstrVec static
      global array.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2195 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-04-09 05:21:26 +00:00
parent 6111a87b3a
commit 1d21f3eb1d
1 changed files with 7 additions and 91 deletions
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98
lib/Target/SparcV9/SparcV9TargetMachine.cpp
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@ -1,14 +1,9 @@
// $Id$
//***************************************************************************
// File:
// Sparc.cpp
//
// Purpose:
//
// History:
// 7/15/01 - Vikram Adve - Created
//**************************************************************************/
//===-- Sparc.cpp - General implementation file for the Sparc Target ------===//
//
// This file contains the code for the Sparc Target that does not fit in any of
// the other files in this directory.
//
//===----------------------------------------------------------------------===//
#include "SparcInternals.h"
#include "llvm/Target/Sparc.h"
@ -17,7 +12,6 @@
#include "llvm/CodeGen/MachineCodeForInstruction.h"
#include "llvm/CodeGen/MachineCodeForMethod.h"
#include "llvm/CodeGen/RegisterAllocation.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Function.h"
#include "llvm/BasicBlock.h"
#include "llvm/PassManager.h"
@ -37,88 +31,10 @@ const MachineInstrDescriptor SparcMachineInstrDesc[] = {
// allocateSparcTargetMachine - Allocate and return a subclass of TargetMachine
// that implements the Sparc backend. (the llvm/CodeGen/Sparc.h interface)
//----------------------------------------------------------------------------
//
TargetMachine *allocateSparcTargetMachine() { return new UltraSparc(); }
//---------------------------------------------------------------------------
// class InsertPrologEpilogCode
//
// 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.
//
//---------------------------------------------------------------------------
static MachineInstr* minstrVec[MAX_INSTR_PER_VMINSTR];
class InsertPrologEpilogCode : public MethodPass {
TargetMachine &Target;
public:
inline InsertPrologEpilogCode(TargetMachine &T) : Target(T) {}
bool runOnMethod(Function *F) {
MachineCodeForMethod &mcodeInfo = MachineCodeForMethod::get(F);
if (!mcodeInfo.isCompiledAsLeafMethod()) {
InsertPrologCode(F);
InsertEpilogCode(F);
}
return false;
}
void InsertPrologCode(Function *F);
void InsertEpilogCode(Function *F);
};
void InsertPrologEpilogCode::InsertPrologCode(Function *F)
{
BasicBlock *entryBB = F->getEntryNode();
unsigned N = GetInstructionsForProlog(entryBB, Target, minstrVec);
assert(N <= MAX_INSTR_PER_VMINSTR);
MachineCodeForBasicBlock& bbMvec = entryBB->getMachineInstrVec();
bbMvec.insert(bbMvec.begin(), minstrVec, minstrVec+N);
}
void InsertPrologEpilogCode::InsertEpilogCode(Function *F)
{
for (Function::iterator I = F->begin(), E = F->end(); I != E; ++I) {
Instruction *TermInst = (Instruction*)(*I)->getTerminator();
if (TermInst->getOpcode() == Instruction::Ret)
{
BasicBlock* exitBB = *I;
unsigned N = GetInstructionsForEpilog(exitBB, Target, minstrVec);
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());
termMvec.pop_back();
bbMvec.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(N == ndelays && "Cannot use epilog code for delay slots?");
// Append the epilog code to the end of the basic block.
bbMvec.insert(bbMvec.end(), minstrVec, minstrVec+N);
}
}
}
//---------------------------------------------------------------------------
// class UltraSparcFrameInfo
@ -272,7 +188,7 @@ void UltraSparc::addPassesToEmitAssembly(PassManager &PM, std::ostream &Out) {
//PM.add(new RemoveChainedBranches()); // should be folded with previous
//PM.add(new RemoveRedundantOps()); // operations with %g0, NOP, etc.
PM.add(new InsertPrologEpilogCode(*this));
PM.add(createPrologEpilogCodeInserter(*this));
// Output assembly language to the .s file. Assembly emission is split into
// two parts: Function output and Global value output. This is because