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3070e2ff79
including registers, constants, and partial support for global addresses * The JIT is disabled by default to allow building llvm-gcc, which wants to test running programs during configure git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17149 91177308-0d34-0410-b5e6-96231b3b80d8
283 lines
10 KiB
C++
283 lines
10 KiB
C++
//===-- PPC32CodeEmitter.cpp - JIT Code Emitter for PowerPC32 -----*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the PowerPC 32-bit CodeEmitter and associated machinery to
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// JIT-compile bytecode to native PowerPC.
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//
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//===----------------------------------------------------------------------===//
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#include "PPC32JITInfo.h"
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#include "PPC32TargetMachine.h"
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#include "llvm/Module.h"
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Support/Debug.h"
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namespace llvm {
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namespace {
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class JITResolver {
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MachineCodeEmitter &MCE;
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// LazyCodeGenMap - Keep track of call sites for functions that are to be
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// lazily resolved.
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std::map<unsigned, Function*> LazyCodeGenMap;
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// LazyResolverMap - Keep track of the lazy resolver created for a
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// particular function so that we can reuse them if necessary.
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std::map<Function*, unsigned> LazyResolverMap;
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public:
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JITResolver(MachineCodeEmitter &mce) : MCE(mce) {}
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unsigned getLazyResolver(Function *F);
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unsigned addFunctionReference(unsigned Address, Function *F);
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private:
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unsigned emitStubForFunction(Function *F);
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static void CompilationCallback();
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unsigned resolveFunctionReference(unsigned RetAddr);
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};
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static JITResolver &getResolver(MachineCodeEmitter &MCE) {
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static JITResolver *TheJITResolver = 0;
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if (TheJITResolver == 0)
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TheJITResolver = new JITResolver(MCE);
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return *TheJITResolver;
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}
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}
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unsigned JITResolver::getLazyResolver(Function *F) {
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std::map<Function*, unsigned>::iterator I = LazyResolverMap.lower_bound(F);
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if (I != LazyResolverMap.end() && I->first == F) return I->second;
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unsigned Stub = emitStubForFunction(F);
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LazyResolverMap.insert(I, std::make_pair(F, Stub));
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return Stub;
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}
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/// addFunctionReference - This method is called when we need to emit the
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/// address of a function that has not yet been emitted, so we don't know the
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/// address. Instead, we emit a call to the CompilationCallback method, and
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/// keep track of where we are.
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///
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unsigned JITResolver::addFunctionReference(unsigned Address, Function *F) {
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LazyCodeGenMap[Address] = F;
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return (intptr_t)&JITResolver::CompilationCallback;
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}
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unsigned JITResolver::resolveFunctionReference(unsigned RetAddr) {
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std::map<unsigned, Function*>::iterator I = LazyCodeGenMap.find(RetAddr);
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assert(I != LazyCodeGenMap.end() && "Not in map!");
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Function *F = I->second;
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LazyCodeGenMap.erase(I);
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return MCE.forceCompilationOf(F);
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}
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/// emitStubForFunction - This method is used by the JIT when it needs to emit
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/// the address of a function for a function whose code has not yet been
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/// generated. In order to do this, it generates a stub which jumps to the lazy
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/// function compiler, which will eventually get fixed to call the function
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/// directly.
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///
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unsigned JITResolver::emitStubForFunction(Function *F) {
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std::cerr << "PPC32CodeEmitter::emitStubForFunction() unimplemented!\n";
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abort();
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return 0;
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}
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void JITResolver::CompilationCallback() {
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std::cerr << "PPC32CodeEmitter: CompilationCallback() unimplemented!";
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abort();
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}
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namespace {
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class PPC32CodeEmitter : public MachineFunctionPass {
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TargetMachine &TM;
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MachineCodeEmitter &MCE;
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// Tracks which instruction references which BasicBlock
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std::vector<std::pair<const BasicBlock*,
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std::pair<unsigned*,MachineInstr*> > > BBRefs;
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// Tracks where each BasicBlock starts
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std::map<const BasicBlock*, long> BBLocations;
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/// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
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///
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int64_t getMachineOpValue(MachineInstr &MI, MachineOperand &MO);
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unsigned getAddressOfExternalFunction(Function *F);
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public:
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PPC32CodeEmitter(TargetMachine &T, MachineCodeEmitter &M)
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: TM(T), MCE(M) {}
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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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/// emitWord - write a 32-bit word to memory at the current PC
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///
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void emitWord(unsigned w) { MCE.emitWord(w); }
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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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/// 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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///
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unsigned getBinaryCodeForInstr(MachineInstr &MI);
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};
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}
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/// addPassesToEmitMachineCode - Add passes to the specified pass manager to get
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/// machine code emitted. This uses a MachineCodeEmitter object to handle
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/// actually outputting the machine code and resolving things like the address
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/// of functions. This method should returns true if machine code emission is
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/// not supported.
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///
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bool PPC32TargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
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MachineCodeEmitter &MCE) {
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// Keep as `true' until this is a functional JIT to allow llvm-gcc to build
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return true;
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// Machine code emitter pass for PowerPC
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MachineCodeEmitter *M = &MCE;
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DEBUG(M = MachineCodeEmitter::createDebugEmitter(MCE));
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PM.add(new PPC32CodeEmitter(*this, *M));
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// Delete machine code for this function after emitting it
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PM.add(createMachineCodeDeleter());
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return false;
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}
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bool PPC32CodeEmitter::runOnMachineFunction(MachineFunction &MF) {
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MCE.startFunction(MF);
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MCE.emitConstantPool(MF.getConstantPool());
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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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MCE.finishFunction(MF);
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// Resolve branches to BasicBlocks for the entire function
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for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
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long Location = BBLocations[BBRefs[i].first];
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unsigned *Ref = BBRefs[i].second.first;
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MachineInstr *MI = BBRefs[i].second.second;
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DEBUG(std::cerr << "Fixup @ " << std::hex << Ref << " to 0x" << Location
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<< " in instr: " << std::dec << *MI);
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for (unsigned ii = 0, ee = MI->getNumOperands(); ii != ee; ++ii) {
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MachineOperand &op = MI->getOperand(ii);
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if (op.isPCRelativeDisp()) {
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// the instruction's branch target is made such that it branches to
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// PC + (branchTarget * 4), so undo that arithmetic here:
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// Location is the target of the branch
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// Ref is the location of the instruction, and hence the PC
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int64_t branchTarget = (Location - (long)Ref) >> 2;
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MI->SetMachineOperandConst(ii, MachineOperand::MO_SignExtendedImmed,
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branchTarget);
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unsigned fixedInstr = PPC32CodeEmitter::getBinaryCodeForInstr(*MI);
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MCE.emitWordAt(fixedInstr, Ref);
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break;
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}
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}
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}
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BBRefs.clear();
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BBLocations.clear();
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return false;
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}
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void PPC32CodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
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for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I)
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emitWord(getBinaryCodeForInstr(*I));
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}
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unsigned PPC32CodeEmitter::getAddressOfExternalFunction(Function *F) {
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static std::map<Function*, unsigned> ExternalFn2Addr;
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std::map<Function*, unsigned>::iterator Addr = ExternalFn2Addr.find(F);
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if (Addr == ExternalFn2Addr.end())
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ExternalFn2Addr[F] = MCE.forceCompilationOf(F);
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return ExternalFn2Addr[F];
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}
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int64_t PPC32CodeEmitter::getMachineOpValue(MachineInstr &MI,
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MachineOperand &MO) {
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int64_t rv = 0; // Return value; defaults to 0 for unhandled cases
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// or things that get fixed up later by the JIT.
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if (MO.isRegister()) {
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rv = MO.getReg();
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} else if (MO.isImmediate()) {
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rv = MO.getImmedValue();
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} else if (MO.isGlobalAddress()) {
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GlobalValue *GV = MO.getGlobal();
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intptr_t Addr = (intptr_t)MCE.getGlobalValueAddress(GV);
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if (Addr == 0) {
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if (Function *F = dyn_cast<Function>(GV)) {
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if (F->isExternal())
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rv = getAddressOfExternalFunction(F);
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else {
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// Function has not yet been code generated!
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getResolver(MCE).addFunctionReference(MCE.getCurrentPCValue(), F);
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// Delayed resolution...
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return (intptr_t)getResolver(MCE).getLazyResolver(F);
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}
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} else if (GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV)) {
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if (GVar->isExternal())
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rv = MCE.getGlobalValueAddress(MO.getSymbolName());
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else {
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std::cerr << "PPC32CodeEmitter: External global addr not found: "
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<< *GVar;
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abort();
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}
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}
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}
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if (MO.isPCRelative()) { // Global variable reference
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rv = (Addr - MCE.getCurrentPCValue()) >> 2;
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}
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} else if (MO.isMachineBasicBlock()) {
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const BasicBlock *BB = MO.getMachineBasicBlock()->getBasicBlock();
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unsigned* CurrPC = (unsigned*)(intptr_t)MCE.getCurrentPCValue();
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BBRefs.push_back(std::make_pair(BB, std::make_pair(CurrPC, &MI)));
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} else if (MO.isConstantPoolIndex()) {
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unsigned index = MO.getConstantPoolIndex();
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rv = MCE.getConstantPoolEntryAddress(index);
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} else if (MO.isFrameIndex()) {
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std::cerr << "PPC32CodeEmitter: error: Frame index unhandled!\n";
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abort();
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} else {
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std::cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
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abort();
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}
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return rv;
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}
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void *PPC32JITInfo::getJITStubForFunction(Function *F, MachineCodeEmitter &MCE){
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return (void*)((unsigned long)getResolver(MCE).getLazyResolver(F));
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}
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void PPC32JITInfo::replaceMachineCodeForFunction (void *Old, void *New) {
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std::cerr << "PPC32JITInfo::replaceMachineCodeForFunction not implemented\n";
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abort();
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}
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#include "PPC32GenCodeEmitter.inc"
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} // end llvm namespace
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