2005-10-16 05:39:50 +00:00
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//===-- PPCCodeEmitter.cpp - JIT Code Emitter for PowerPC32 -------*- C++ -*-=//
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2005-04-21 23:30:14 +00:00
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//
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2004-06-21 16:55:25 +00:00
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// The LLVM Compiler Infrastructure
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//
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2007-12-29 20:36:04 +00:00
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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2005-04-21 23:30:14 +00:00
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//
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2004-06-21 16:55:25 +00:00
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//===----------------------------------------------------------------------===//
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2005-04-21 23:30:14 +00:00
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//
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2004-10-14 06:07:25 +00:00
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// This file defines the PowerPC 32-bit CodeEmitter and associated machinery to
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2007-07-05 17:07:56 +00:00
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// JIT-compile bitcode to native PowerPC.
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2004-06-21 16:55:25 +00:00
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//
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//===----------------------------------------------------------------------===//
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2005-10-14 23:59:06 +00:00
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#include "PPCTargetMachine.h"
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#include "PPCRelocations.h"
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2005-10-14 23:51:18 +00:00
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#include "PPC.h"
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2004-10-21 01:42:02 +00:00
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#include "llvm/Module.h"
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2005-10-15 21:58:54 +00:00
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#include "llvm/PassManager.h"
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2004-08-09 23:03:59 +00:00
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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2004-10-23 23:47:34 +00:00
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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2008-02-13 18:39:37 +00:00
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#include "llvm/CodeGen/MachineModuleInfo.h"
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2004-08-09 23:03:59 +00:00
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#include "llvm/CodeGen/Passes.h"
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2006-08-23 21:08:52 +00:00
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#include "llvm/Support/Debug.h"
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2006-08-27 12:54:02 +00:00
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#include "llvm/Support/Compiler.h"
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2006-02-18 00:08:58 +00:00
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#include "llvm/Target/TargetOptions.h"
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2004-11-16 04:47:33 +00:00
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using namespace llvm;
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2004-06-21 16:55:25 +00:00
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2004-08-09 23:03:59 +00:00
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namespace {
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2006-06-28 23:17:24 +00:00
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class VISIBILITY_HIDDEN PPCCodeEmitter : public MachineFunctionPass {
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2004-08-09 23:03:59 +00:00
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TargetMachine &TM;
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MachineCodeEmitter &MCE;
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2006-12-08 04:54:03 +00:00
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/// MovePCtoLROffset - When/if we see a MovePCtoLR instruction, we record
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/// its address in the function into this pointer.
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void *MovePCtoLROffset;
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2004-10-21 01:42:02 +00:00
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/// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
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///
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2008-09-02 06:51:36 +00:00
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unsigned getMachineOpValue(const MachineInstr &MI, const MachineOperand &MO);
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2008-02-13 18:39:37 +00:00
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void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<MachineModuleInfo>();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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2004-10-21 01:42:02 +00:00
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2004-08-09 23:03:59 +00:00
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public:
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2007-05-03 01:11:54 +00:00
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static char ID;
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2005-10-14 23:37:35 +00:00
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PPCCodeEmitter(TargetMachine &T, MachineCodeEmitter &M)
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2007-05-01 21:15:47 +00:00
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: MachineFunctionPass((intptr_t)&ID), TM(T), MCE(M) {}
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2004-08-09 23:03:59 +00:00
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const char *getPassName() const { return "PowerPC Machine Code Emitter"; }
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/// runOnMachineFunction - emits the given MachineFunction to memory
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///
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bool runOnMachineFunction(MachineFunction &MF);
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/// emitBasicBlock - emits the given MachineBasicBlock to memory
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///
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void emitBasicBlock(MachineBasicBlock &MBB);
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2004-10-14 06:07:25 +00:00
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/// getValueBit - return the particular bit of Val
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///
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unsigned getValueBit(int64_t Val, unsigned bit) { return (Val >> bit) & 1; }
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2004-08-09 23:03:59 +00:00
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2004-10-21 01:42:02 +00:00
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/// getBinaryCodeForInstr - This function, generated by the
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/// CodeEmitterGenerator using TableGen, produces the binary encoding for
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/// machine instructions.
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2004-08-09 23:03:59 +00:00
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///
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2008-09-02 06:51:36 +00:00
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unsigned getBinaryCodeForInstr(const MachineInstr &MI);
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2004-08-09 23:03:59 +00:00
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};
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2007-05-03 01:11:54 +00:00
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char PPCCodeEmitter::ID = 0;
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2004-08-09 23:03:59 +00:00
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}
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2006-08-23 21:08:52 +00:00
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/// createPPCCodeEmitterPass - Return a pass that emits the collected PPC code
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/// to the specified MCE object.
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FunctionPass *llvm::createPPCCodeEmitterPass(PPCTargetMachine &TM,
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MachineCodeEmitter &MCE) {
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return new PPCCodeEmitter(TM, MCE);
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2004-08-09 23:03:59 +00:00
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}
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2005-10-14 23:37:35 +00:00
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bool PPCCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
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2006-02-22 20:19:42 +00:00
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assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
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MF.getTarget().getRelocationModel() != Reloc::Static) &&
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"JIT relocation model must be set to static or default!");
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2008-02-13 18:39:37 +00:00
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MCE.setModuleInfo(&getAnalysis<MachineModuleInfo>());
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2006-05-02 18:27:26 +00:00
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do {
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2006-12-08 04:54:03 +00:00
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MovePCtoLROffset = 0;
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2006-05-02 18:27:26 +00:00
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MCE.startFunction(MF);
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for (MachineFunction::iterator BB = MF.begin(), E = MF.end(); BB != E; ++BB)
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emitBasicBlock(*BB);
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} while (MCE.finishFunction(MF));
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2004-10-21 01:42:02 +00:00
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2004-08-09 23:03:59 +00:00
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return false;
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}
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2005-10-14 23:37:35 +00:00
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void PPCCodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
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2006-05-03 17:10:41 +00:00
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MCE.StartMachineBasicBlock(&MBB);
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2004-10-23 18:28:01 +00:00
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for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I){
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2008-09-02 06:51:36 +00:00
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const MachineInstr &MI = *I;
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2004-11-23 05:59:53 +00:00
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switch (MI.getOpcode()) {
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default:
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2008-09-02 06:51:36 +00:00
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MCE.emitWordBE(getBinaryCodeForInstr(MI));
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2004-11-23 05:59:53 +00:00
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break;
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2008-07-01 00:05:16 +00:00
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case TargetInstrInfo::DBG_LABEL:
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case TargetInstrInfo::EH_LABEL:
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2008-02-13 18:39:37 +00:00
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MCE.emitLabel(MI.getOperand(0).getImm());
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break;
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2008-03-17 06:56:52 +00:00
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case TargetInstrInfo::IMPLICIT_DEF:
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break; // pseudo opcode, no side effects
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2004-11-23 05:59:53 +00:00
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case PPC::MovePCtoLR:
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2006-11-14 18:44:47 +00:00
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case PPC::MovePCtoLR8:
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2006-12-08 04:54:03 +00:00
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assert(TM.getRelocationModel() == Reloc::PIC_);
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MovePCtoLROffset = (void*)MCE.getCurrentPCValue();
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MCE.emitWordBE(0x48000005); // bl 1
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2004-11-23 05:59:53 +00:00
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break;
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}
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2004-10-23 18:28:01 +00:00
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}
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2004-08-09 23:03:59 +00:00
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}
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2008-09-02 06:51:36 +00:00
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unsigned PPCCodeEmitter::getMachineOpValue(const MachineInstr &MI,
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const MachineOperand &MO) {
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2005-04-21 23:30:14 +00:00
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2008-09-02 06:51:36 +00:00
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unsigned rv = 0; // Return value; defaults to 0 for unhandled cases
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2006-05-03 17:10:41 +00:00
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// or things that get fixed up later by the JIT.
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2004-10-21 01:42:02 +00:00
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if (MO.isRegister()) {
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2006-04-17 21:07:20 +00:00
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rv = PPCRegisterInfo::getRegisterNumbering(MO.getReg());
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2005-04-19 05:41:52 +00:00
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2005-07-20 22:42:00 +00:00
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// Special encoding for MTCRF and MFOCRF, which uses a bit mask for the
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2005-04-19 05:41:52 +00:00
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// register, not the register number directly.
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2005-07-20 22:42:00 +00:00
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if ((MI.getOpcode() == PPC::MTCRF || MI.getOpcode() == PPC::MFOCRF) &&
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2005-04-19 05:41:52 +00:00
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(MO.getReg() >= PPC::CR0 && MO.getReg() <= PPC::CR7)) {
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rv = 0x80 >> rv;
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}
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2004-10-14 06:39:56 +00:00
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} else if (MO.isImmediate()) {
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2007-12-30 20:49:49 +00:00
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rv = MO.getImm();
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2006-08-23 21:08:52 +00:00
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} else if (MO.isGlobalAddress() || MO.isExternalSymbol() ||
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MO.isConstantPoolIndex() || MO.isJumpTableIndex()) {
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2004-11-23 15:56:38 +00:00
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unsigned Reloc = 0;
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2007-02-25 05:34:32 +00:00
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if (MI.getOpcode() == PPC::BL_Macho || MI.getOpcode() == PPC::BL8_Macho ||
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2008-04-30 09:16:33 +00:00
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MI.getOpcode() == PPC::BL_ELF || MI.getOpcode() == PPC::BL8_ELF ||
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MI.getOpcode() == PPC::TAILB || MI.getOpcode() == PPC::TAILB8)
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2004-11-23 05:59:53 +00:00
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Reloc = PPC::reloc_pcrel_bx;
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2004-11-24 22:30:08 +00:00
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else {
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2006-12-08 04:54:03 +00:00
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if (TM.getRelocationModel() == Reloc::PIC_) {
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assert(MovePCtoLROffset && "MovePCtoLR not seen yet?");
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}
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2005-07-21 20:44:43 +00:00
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switch (MI.getOpcode()) {
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2006-12-06 19:40:04 +00:00
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default: MI.dump(); assert(0 && "Unknown instruction for relocation!");
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2005-07-21 20:44:43 +00:00
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case PPC::LIS:
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2006-07-12 21:23:20 +00:00
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case PPC::LIS8:
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2006-08-23 21:08:52 +00:00
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case PPC::ADDIS:
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2006-07-12 21:23:20 +00:00
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case PPC::ADDIS8:
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2006-04-21 22:04:15 +00:00
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Reloc = PPC::reloc_absolute_high; // Pointer to symbol
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2005-07-21 20:44:43 +00:00
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break;
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2006-04-22 06:17:56 +00:00
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case PPC::LI:
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2006-07-12 21:23:20 +00:00
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case PPC::LI8:
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2005-07-21 20:44:43 +00:00
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case PPC::LA:
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2006-07-12 21:23:20 +00:00
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// Loads.
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2005-07-21 20:44:43 +00:00
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case PPC::LBZ:
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2006-12-15 16:44:10 +00:00
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case PPC::LBZ8:
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2005-07-21 20:44:43 +00:00
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case PPC::LHA:
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2006-12-15 16:44:10 +00:00
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case PPC::LHA8:
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2005-07-21 20:44:43 +00:00
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case PPC::LHZ:
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2006-12-15 16:44:10 +00:00
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case PPC::LHZ8:
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2005-07-21 20:44:43 +00:00
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case PPC::LWZ:
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2006-12-15 16:44:10 +00:00
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case PPC::LWZ8:
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2005-07-21 20:44:43 +00:00
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case PPC::LFS:
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case PPC::LFD:
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2006-07-12 21:23:20 +00:00
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// Stores.
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2005-07-21 20:44:43 +00:00
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case PPC::STB:
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2006-12-15 16:44:10 +00:00
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case PPC::STB8:
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2005-07-21 20:44:43 +00:00
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case PPC::STH:
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2006-12-15 16:44:10 +00:00
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case PPC::STH8:
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2005-07-21 20:44:43 +00:00
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case PPC::STW:
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2006-12-15 16:44:10 +00:00
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case PPC::STW8:
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2005-07-21 20:44:43 +00:00
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case PPC::STFS:
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case PPC::STFD:
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2006-04-21 22:04:15 +00:00
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Reloc = PPC::reloc_absolute_low;
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2005-07-21 20:44:43 +00:00
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break;
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2006-07-12 21:23:20 +00:00
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case PPC::LWA:
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case PPC::LD:
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case PPC::STD:
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case PPC::STD_32:
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Reloc = PPC::reloc_absolute_low_ix;
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break;
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2004-11-24 22:30:08 +00:00
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}
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2004-11-23 05:59:53 +00:00
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}
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2006-12-11 23:22:45 +00:00
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MachineRelocation R;
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if (MO.isGlobalAddress()) {
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R = MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
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2008-01-04 02:22:21 +00:00
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MO.getGlobal(), 0,
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isa<Function>(MO.getGlobal()));
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2006-12-11 23:22:45 +00:00
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} else if (MO.isExternalSymbol()) {
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R = MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
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Reloc, MO.getSymbolName(), 0);
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} else if (MO.isConstantPoolIndex()) {
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R = MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
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2007-12-30 23:10:15 +00:00
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Reloc, MO.getIndex(), 0);
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2006-12-11 23:22:45 +00:00
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} else {
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assert(MO.isJumpTableIndex());
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R = MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
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2007-12-30 23:10:15 +00:00
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Reloc, MO.getIndex(), 0);
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2006-12-11 23:22:45 +00:00
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}
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// If in PIC mode, we need to encode the negated address of the
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// 'movepctolr' into the unrelocated field. After relocation, we'll have
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// &gv-&movepctolr-4 in the imm field. Once &movepctolr is added to the imm
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// field, we get &gv. This doesn't happen for branch relocations, which are
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// always implicitly pc relative.
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if (TM.getRelocationModel() == Reloc::PIC_ && Reloc != PPC::reloc_pcrel_bx){
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assert(MovePCtoLROffset && "MovePCtoLR not seen yet?");
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R.setConstantVal(-(intptr_t)MovePCtoLROffset - 4);
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}
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MCE.addRelocation(R);
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2004-10-14 06:39:56 +00:00
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} else if (MO.isMachineBasicBlock()) {
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2006-07-27 18:21:10 +00:00
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unsigned Reloc = 0;
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unsigned Opcode = MI.getOpcode();
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2007-02-25 05:34:32 +00:00
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if (Opcode == PPC::B || Opcode == PPC::BL_Macho ||
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Opcode == PPC::BLA_Macho || Opcode == PPC::BL_ELF ||
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Opcode == PPC::BLA_ELF)
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2006-07-27 18:21:10 +00:00
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Reloc = PPC::reloc_pcrel_bx;
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2006-12-08 04:54:03 +00:00
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else // BCC instruction
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2006-07-27 18:21:10 +00:00
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Reloc = PPC::reloc_pcrel_bcx;
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MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
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2007-12-30 23:10:15 +00:00
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Reloc, MO.getMBB()));
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2004-11-24 01:56:12 +00:00
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} else {
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2006-12-07 22:21:48 +00:00
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cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
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2004-11-24 01:56:12 +00:00
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abort();
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2004-10-23 18:28:01 +00:00
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}
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2004-11-24 01:56:12 +00:00
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2004-10-14 06:39:56 +00:00
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return rv;
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2004-06-21 16:55:25 +00:00
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}
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2005-10-14 23:37:35 +00:00
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#include "PPCGenCodeEmitter.inc"
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2004-08-09 23:03:59 +00:00
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