mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-11-04 05:17:07 +00:00
3f55a4fcab
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22648 91177308-0d34-0410-b5e6-96231b3b80d8
240 lines
8.0 KiB
C++
240 lines
8.0 KiB
C++
//===-- Alpha/AlphaCodeEmitter.cpp - Convert Alpha code to machine code ---===//
|
|
//
|
|
// 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.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file contains the pass that transforms the Alpha machine instructions
|
|
// into relocatable machine code.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "AlphaTargetMachine.h"
|
|
#include "AlphaRelocations.h"
|
|
#include "Alpha.h"
|
|
#include "llvm/PassManager.h"
|
|
#include "llvm/CodeGen/MachineCodeEmitter.h"
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
|
#include "llvm/CodeGen/MachineInstr.h"
|
|
#include "llvm/CodeGen/Passes.h"
|
|
#include "llvm/Function.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/ADT/Statistic.h"
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
Statistic<>
|
|
NumEmitted("alpha-emitter", "Number of machine instructions emitted");
|
|
}
|
|
|
|
namespace {
|
|
class AlphaCodeEmitter : public MachineFunctionPass {
|
|
const AlphaInstrInfo *II;
|
|
MachineCodeEmitter &MCE;
|
|
std::map<const MachineBasicBlock*, unsigned*> BasicBlockAddrs;
|
|
std::vector<std::pair<const MachineBasicBlock *, unsigned*> > BBRefs;
|
|
|
|
/// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
|
|
///
|
|
int getMachineOpValue(MachineInstr &MI, MachineOperand &MO);
|
|
|
|
public:
|
|
explicit AlphaCodeEmitter(MachineCodeEmitter &mce) : II(0), MCE(mce) {}
|
|
AlphaCodeEmitter(MachineCodeEmitter &mce, const AlphaInstrInfo& ii)
|
|
: II(&ii), MCE(mce) {}
|
|
|
|
bool runOnMachineFunction(MachineFunction &MF);
|
|
|
|
virtual const char *getPassName() const {
|
|
return "Alpha Machine Code Emitter";
|
|
}
|
|
|
|
void emitInstruction(const MachineInstr &MI);
|
|
|
|
/// emitWord - write a 32-bit word to memory at the current PC
|
|
///
|
|
void emitWord(unsigned w) { MCE.emitWord(w); }
|
|
|
|
/// getBinaryCodeForInstr - This function, generated by the
|
|
/// CodeEmitterGenerator using TableGen, produces the binary encoding for
|
|
/// machine instructions.
|
|
///
|
|
unsigned getBinaryCodeForInstr(MachineInstr &MI);
|
|
|
|
private:
|
|
void emitBasicBlock(MachineBasicBlock &MBB);
|
|
|
|
};
|
|
}
|
|
|
|
/// createAlphaCodeEmitterPass - Return a pass that emits the collected Alpha code
|
|
/// to the specified MCE object.
|
|
FunctionPass *llvm::createAlphaCodeEmitterPass(MachineCodeEmitter &MCE) {
|
|
return new AlphaCodeEmitter(MCE);
|
|
}
|
|
|
|
bool AlphaCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
|
|
II = ((AlphaTargetMachine&)MF.getTarget()).getInstrInfo();
|
|
|
|
MCE.startFunction(MF);
|
|
MCE.emitConstantPool(MF.getConstantPool());
|
|
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
|
|
emitBasicBlock(*I);
|
|
MCE.finishFunction(MF);
|
|
|
|
// Resolve all forward branches now...
|
|
for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
|
|
unsigned* Location = (unsigned*)BasicBlockAddrs[BBRefs[i].first];
|
|
unsigned* Ref = (unsigned*)BBRefs[i].second;
|
|
intptr_t BranchTargetDisp =
|
|
(((unsigned char*)Location - (unsigned char*)Ref) >> 2) - 1;
|
|
DEBUG(std::cerr << "Fixup @ " << (void*)Ref << " to " << (void*)Location
|
|
<< " Disp " << BranchTargetDisp
|
|
<< " using " << (BranchTargetDisp & ((1 << 22)-1)) << "\n");
|
|
*Ref |= (BranchTargetDisp & ((1 << 21)-1));
|
|
}
|
|
BBRefs.clear();
|
|
BasicBlockAddrs.clear();
|
|
|
|
return false;
|
|
}
|
|
|
|
void AlphaCodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
|
|
uintptr_t Addr = MCE.getCurrentPCValue();
|
|
BasicBlockAddrs[&MBB] = (unsigned*)Addr;
|
|
|
|
for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
|
|
I != E; ++I) {
|
|
MachineInstr &MI = *I;
|
|
unsigned Opcode = MI.getOpcode();
|
|
switch(MI.getOpcode()) {
|
|
default:
|
|
emitWord(getBinaryCodeForInstr(*I));
|
|
break;
|
|
case Alpha::ALTENT:
|
|
case Alpha::PCLABEL:
|
|
case Alpha::MEMLABEL:
|
|
case Alpha::IDEF:
|
|
break; //skip these
|
|
}
|
|
}
|
|
}
|
|
|
|
static unsigned getAlphaRegNumber(unsigned Reg) {
|
|
switch (Reg) {
|
|
case Alpha::R0 : case Alpha::F0 : return 0;
|
|
case Alpha::R1 : case Alpha::F1 : return 1;
|
|
case Alpha::R2 : case Alpha::F2 : return 2;
|
|
case Alpha::R3 : case Alpha::F3 : return 3;
|
|
case Alpha::R4 : case Alpha::F4 : return 4;
|
|
case Alpha::R5 : case Alpha::F5 : return 5;
|
|
case Alpha::R6 : case Alpha::F6 : return 6;
|
|
case Alpha::R7 : case Alpha::F7 : return 7;
|
|
case Alpha::R8 : case Alpha::F8 : return 8;
|
|
case Alpha::R9 : case Alpha::F9 : return 9;
|
|
case Alpha::R10 : case Alpha::F10 : return 10;
|
|
case Alpha::R11 : case Alpha::F11 : return 11;
|
|
case Alpha::R12 : case Alpha::F12 : return 12;
|
|
case Alpha::R13 : case Alpha::F13 : return 13;
|
|
case Alpha::R14 : case Alpha::F14 : return 14;
|
|
case Alpha::R15 : case Alpha::F15 : return 15;
|
|
case Alpha::R16 : case Alpha::F16 : return 16;
|
|
case Alpha::R17 : case Alpha::F17 : return 17;
|
|
case Alpha::R18 : case Alpha::F18 : return 18;
|
|
case Alpha::R19 : case Alpha::F19 : return 19;
|
|
case Alpha::R20 : case Alpha::F20 : return 20;
|
|
case Alpha::R21 : case Alpha::F21 : return 21;
|
|
case Alpha::R22 : case Alpha::F22 : return 22;
|
|
case Alpha::R23 : case Alpha::F23 : return 23;
|
|
case Alpha::R24 : case Alpha::F24 : return 24;
|
|
case Alpha::R25 : case Alpha::F25 : return 25;
|
|
case Alpha::R26 : case Alpha::F26 : return 26;
|
|
case Alpha::R27 : case Alpha::F27 : return 27;
|
|
case Alpha::R28 : case Alpha::F28 : return 28;
|
|
case Alpha::R29 : case Alpha::F29 : return 29;
|
|
case Alpha::R30 : case Alpha::F30 : return 30;
|
|
case Alpha::R31 : case Alpha::F31 : return 31;
|
|
default:
|
|
assert(0 && "Unhandled reg");
|
|
abort();
|
|
}
|
|
}
|
|
|
|
int AlphaCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) {
|
|
|
|
int rv = 0; // Return value; defaults to 0 for unhandled cases
|
|
// or things that get fixed up later by the JIT.
|
|
|
|
if (MO.isRegister()) {
|
|
rv = getAlphaRegNumber(MO.getReg());
|
|
} else if (MO.isImmediate()) {
|
|
rv = MO.getImmedValue();
|
|
} else if (MO.isGlobalAddress() || MO.isExternalSymbol()
|
|
|| MO.isConstantPoolIndex()) {
|
|
DEBUG(std::cerr << MO << " is a relocated op for " << MI << "\n";);
|
|
bool isExternal = MO.isExternalSymbol() ||
|
|
(MO.isGlobalAddress() &&
|
|
( MO.getGlobal()->hasWeakLinkage() ||
|
|
MO.getGlobal()->isExternal()) );
|
|
unsigned Reloc = 0;
|
|
int Offset = 0;
|
|
bool useGOT = false;
|
|
switch (MI.getOpcode()) {
|
|
case Alpha::BSR:
|
|
Reloc = Alpha::reloc_bsr;
|
|
break;
|
|
case Alpha::LDLr:
|
|
case Alpha::LDQr:
|
|
case Alpha::LDBUr:
|
|
case Alpha::LDWUr:
|
|
case Alpha::LDSr:
|
|
case Alpha::LDTr:
|
|
case Alpha::LDAr:
|
|
Reloc = Alpha::reloc_gprellow;
|
|
break;
|
|
case Alpha::LDAHr:
|
|
Reloc = Alpha::reloc_gprelhigh;
|
|
break;
|
|
case Alpha::LDQl:
|
|
Reloc = Alpha::reloc_literal;
|
|
useGOT = true;
|
|
break;
|
|
case Alpha::LDAg:
|
|
case Alpha::LDAHg:
|
|
Reloc = Alpha::reloc_gpdist;
|
|
Offset = MI.getOperand(3).getImmedValue();
|
|
break;
|
|
default:
|
|
assert(0 && "unknown relocatable instruction");
|
|
abort();
|
|
}
|
|
if (MO.isGlobalAddress())
|
|
MCE.addRelocation(MachineRelocation((unsigned)MCE.getCurrentPCOffset(),
|
|
Reloc, MO.getGlobal(), Offset,
|
|
false, useGOT));
|
|
else if (MO.isExternalSymbol())
|
|
MCE.addRelocation(MachineRelocation((unsigned)MCE.getCurrentPCOffset(),
|
|
Reloc, MO.getSymbolName(), Offset,
|
|
true));
|
|
else
|
|
MCE.addRelocation(MachineRelocation((unsigned)MCE.getCurrentPCOffset(),
|
|
Reloc, MO.getConstantPoolIndex(),
|
|
Offset));
|
|
} else if (MO.isMachineBasicBlock()) {
|
|
unsigned* CurrPC = (unsigned*)(intptr_t)MCE.getCurrentPCValue();
|
|
BBRefs.push_back(std::make_pair(MO.getMachineBasicBlock(), CurrPC));
|
|
}else {
|
|
std::cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
|
|
abort();
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
|
|
#include "AlphaGenCodeEmitter.inc"
|
|
|