llvm-6502/lib/Target/SparcV9/SparcV9TargetMachine.cpp
Chris Lattner 1d21f3eb1d * Add a useful file comment
* 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
2002-04-09 05:21:26 +00:00

208 lines
7.3 KiB
C++

//===-- 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"
#include "llvm/CodeGen/InstrScheduling.h"
#include "llvm/CodeGen/InstrSelection.h"
#include "llvm/CodeGen/MachineCodeForInstruction.h"
#include "llvm/CodeGen/MachineCodeForMethod.h"
#include "llvm/CodeGen/RegisterAllocation.h"
#include "llvm/Function.h"
#include "llvm/BasicBlock.h"
#include "llvm/PassManager.h"
#include <iostream>
using std::cerr;
// Build the MachineInstruction Description Array...
const MachineInstrDescriptor SparcMachineInstrDesc[] = {
#define I(ENUM, OPCODESTRING, NUMOPERANDS, RESULTPOS, MAXIMM, IMMSE, \
NUMDELAYSLOTS, LATENCY, SCHEDCLASS, INSTFLAGS) \
{ OPCODESTRING, NUMOPERANDS, RESULTPOS, MAXIMM, IMMSE, \
NUMDELAYSLOTS, LATENCY, SCHEDCLASS, INSTFLAGS },
#include "SparcInstr.def"
};
//----------------------------------------------------------------------------
// 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 UltraSparcFrameInfo
//
// Purpose:
// Interface to stack frame layout info for the UltraSPARC.
// Starting offsets for each area of the stack frame are aligned at
// a multiple of getStackFrameSizeAlignment().
//---------------------------------------------------------------------------
int
UltraSparcFrameInfo::getFirstAutomaticVarOffset(MachineCodeForMethod& ,
bool& pos) const
{
pos = false; // static stack area grows downwards
return StaticAreaOffsetFromFP;
}
int
UltraSparcFrameInfo::getRegSpillAreaOffset(MachineCodeForMethod& mcInfo,
bool& pos) const
{
pos = false; // static stack area grows downwards
unsigned int autoVarsSize = mcInfo.getAutomaticVarsSize();
if (int mod = autoVarsSize % getStackFrameSizeAlignment())
autoVarsSize += (getStackFrameSizeAlignment() - mod);
return StaticAreaOffsetFromFP - autoVarsSize;
}
int
UltraSparcFrameInfo::getTmpAreaOffset(MachineCodeForMethod& mcInfo,
bool& pos) const
{
pos = false; // static stack area grows downwards
unsigned int autoVarsSize = mcInfo.getAutomaticVarsSize();
unsigned int spillAreaSize = mcInfo.getRegSpillsSize();
int offset = autoVarsSize + spillAreaSize;
if (int mod = offset % getStackFrameSizeAlignment())
offset += (getStackFrameSizeAlignment() - mod);
return StaticAreaOffsetFromFP - offset;
}
int
UltraSparcFrameInfo::getDynamicAreaOffset(MachineCodeForMethod& mcInfo,
bool& pos) const
{
// Dynamic stack area grows downwards starting at top of opt-args area.
// The opt-args, required-args, and register-save areas are empty except
// during calls and traps, so they are shifted downwards on each
// dynamic-size alloca.
pos = false;
unsigned int optArgsSize = mcInfo.getMaxOptionalArgsSize();
int offset = optArgsSize + FirstOptionalOutgoingArgOffsetFromSP;
assert((offset - OFFSET) % getStackFrameSizeAlignment() == 0);
return offset;
}
//---------------------------------------------------------------------------
// class UltraSparcMachine
//
// Purpose:
// Primary interface to machine description for the UltraSPARC.
// Primarily just initializes machine-dependent parameters in
// class TargetMachine, and creates machine-dependent subclasses
// for classes such as MachineInstrInfo.
//
//---------------------------------------------------------------------------
UltraSparc::UltraSparc()
: TargetMachine("UltraSparc-Native"),
instrInfo(*this),
schedInfo(*this),
regInfo(*this),
frameInfo(*this),
cacheInfo(*this)
{
optSizeForSubWordData = 4;
minMemOpWordSize = 8;
maxAtomicMemOpWordSize = 8;
}
//===---------------------------------------------------------------------===//
// GenerateCodeForTarget Pass
//
// Native code generation for a specified target.
//===---------------------------------------------------------------------===//
class ConstructMachineCodeForFunction : public MethodPass {
TargetMachine &Target;
public:
inline ConstructMachineCodeForFunction(TargetMachine &T) : Target(T) {}
bool runOnMethod(Function *F) {
MachineCodeForMethod::construct(F, Target);
return false;
}
};
class InstructionSelection : public MethodPass {
TargetMachine &Target;
public:
inline InstructionSelection(TargetMachine &T) : Target(T) {}
bool runOnMethod(Function *F) {
if (SelectInstructionsForMethod(F, Target)) {
cerr << "Instr selection failed for function " << F->getName() << "\n";
abort();
}
return false;
}
};
struct FreeMachineCodeForFunction : public MethodPass {
static void freeMachineCode(Instruction *I) {
MachineCodeForInstruction::destroy(I);
}
bool runOnMethod(Function *F) {
for (Function::iterator FI = F->begin(), FE = F->end(); FI != FE; ++FI)
for (BasicBlock::iterator I = (*FI)->begin(), E = (*FI)->end();
I != E; ++I)
MachineCodeForInstruction::get(*I).dropAllReferences();
for (Function::iterator FI = F->begin(), FE = F->end(); FI != FE; ++FI)
for (BasicBlock::iterator I = (*FI)->begin(), E = (*FI)->end();
I != E; ++I)
freeMachineCode(*I);
return false;
}
};
// addPassesToEmitAssembly - This method controls the entire code generation
// process for the ultra sparc.
//
void UltraSparc::addPassesToEmitAssembly(PassManager &PM, std::ostream &Out) {
// Construct and initialize the MachineCodeForMethod object for this fn.
PM.add(new ConstructMachineCodeForFunction(*this));
PM.add(new InstructionSelection(*this));
PM.add(createInstructionSchedulingWithSSAPass(*this));
PM.add(getRegisterAllocator(*this));
//PM.add(new OptimizeLeafProcedures());
//PM.add(new DeleteFallThroughBranches());
//PM.add(new RemoveChainedBranches()); // should be folded with previous
//PM.add(new RemoveRedundantOps()); // operations with %g0, NOP, etc.
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
// function output is pipelined with all of the rest of code generation stuff,
// allowing machine code representations for functions to be free'd after the
// function has been emitted.
//
PM.add(getMethodAsmPrinterPass(PM, Out));
PM.add(new FreeMachineCodeForFunction()); // Free stuff no longer needed
// Emit Module level assembly after all of the functions have been processed.
PM.add(getModuleAsmPrinterPass(PM, Out));
// Emit bytecode to the sparc assembly file into its special section next
PM.add(getEmitBytecodeToAsmPass(Out));
}