mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-20 11:29:24 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6568 91177308-0d34-0410-b5e6-96231b3b80d8
429 lines
15 KiB
C++
429 lines
15 KiB
C++
//===-- SparcV9CodeEmitter.cpp - --------===//
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//
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Constants.h"
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#include "llvm/Function.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/PassManager.h"
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include "llvm/CodeGen/MachineFunctionInfo.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetData.h"
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#include "Support/hash_set"
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#include "SparcInternals.h"
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#include "SparcV9CodeEmitter.h"
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bool UltraSparc::addPassesToEmitMachineCode(PassManager &PM,
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MachineCodeEmitter &MCE) {
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//PM.add(new SparcV9CodeEmitter(MCE));
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//MachineCodeEmitter *M = MachineCodeEmitter::createDebugMachineCodeEmitter();
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MachineCodeEmitter *M = MachineCodeEmitter::createFilePrinterEmitter(MCE);
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PM.add(new SparcV9CodeEmitter(this, *M));
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PM.add(createMachineCodeDestructionPass()); // Free stuff no longer needed
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return false;
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}
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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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JITResolver *TheJITResolver;
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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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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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//std::cerr << "Getting lazy resolver for : " << ((Value*)F)->getName() << "\n";
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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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void JITResolver::CompilationCallback() {
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uint64_t *StackPtr = (uint64_t*)__builtin_frame_address(0);
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uint64_t RetAddr = (uint64_t)(intptr_t)__builtin_return_address(0);
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#if 0
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std::cerr << "In callback! Addr=0x" << std::hex << RetAddr
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<< " SP=0x" << (unsigned)StackPtr << std::dec
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<< ": Resolving call to function: "
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<< TheVM->getFunctionReferencedName((void*)RetAddr) << "\n";
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#endif
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std::cerr << "Sparc's JIT Resolver not implemented!\n";
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abort();
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#if 0
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unsigned NewVal = TheJITResolver->resolveFunctionReference((void*)RetAddr);
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// Rewrite the call target... so that we don't fault every time we execute
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// the call.
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*(unsigned*)RetAddr = NewVal;
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// Change the return address to reexecute the call instruction...
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StackPtr[1] -= 4;
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#endif
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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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#if 0
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MCE.startFunctionStub(*F, 6);
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MCE.emitByte(0xE8); // Call with 32 bit pc-rel destination...
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unsigned Address = addFunctionReference(MCE.getCurrentPCValue(), F);
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MCE.emitWord(Address-MCE.getCurrentPCValue()-4);
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MCE.emitByte(0xCD); // Interrupt - Just a marker identifying the stub!
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return (intptr_t)MCE.finishFunctionStub(*F);
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#endif
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std::cerr << "Sparc's JITResolver::emitStubForFunction() not implemented!\n";
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abort();
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}
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void SparcV9CodeEmitter::emitConstant(unsigned Val, unsigned Size) {
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// Output the constant in big endian byte order...
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unsigned byteVal;
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for (int i = Size-1; i >= 0; --i) {
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byteVal = Val >> 8*i;
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MCE->emitByte(byteVal & 255);
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}
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}
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unsigned getRealRegNum(unsigned fakeReg, unsigned regClass) {
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switch (regClass) {
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case UltraSparcRegInfo::IntRegType: {
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// Sparc manual, p31
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static const unsigned IntRegMap[] = {
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// "o0", "o1", "o2", "o3", "o4", "o5", "o7",
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8, 9, 10, 11, 12, 13, 15,
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// "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
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16, 17, 18, 19, 20, 21, 22, 23,
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// "i0", "i1", "i2", "i3", "i4", "i5",
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24, 25, 26, 27, 28, 29,
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// "i6", "i7",
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30, 31,
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// "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
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0, 1, 2, 3, 4, 5, 6, 7,
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// "o6"
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14
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};
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return IntRegMap[fakeReg];
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break;
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}
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case UltraSparcRegInfo::FPSingleRegType: {
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return fakeReg;
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}
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case UltraSparcRegInfo::FPDoubleRegType: {
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return fakeReg;
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}
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case UltraSparcRegInfo::FloatCCRegType: {
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return fakeReg;
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}
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case UltraSparcRegInfo::IntCCRegType: {
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return fakeReg;
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}
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default:
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assert(0 && "Invalid unified register number in getRegType");
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return fakeReg;
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}
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}
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int64_t SparcV9CodeEmitter::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.isVirtualRegister()) {
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std::cerr << "ERROR: virtual register found in machine code.\n";
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abort();
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} else if (MO.isPCRelativeDisp()) {
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Value *V = MO.getVRegValue();
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if (BasicBlock *BB = dyn_cast<BasicBlock>(V)) {
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std::cerr << "Saving reference to BB (VReg)\n";
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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 (Constant *C = dyn_cast<Constant>(V)) {
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if (ConstantMap.find(C) != ConstantMap.end())
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rv = (int64_t)(intptr_t)ConstantMap[C] - MCE->getCurrentPCValue();
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else {
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std::cerr << "ERROR: constant not in map:" << MO << "\n";
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abort();
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}
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} else {
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std::cerr << "ERROR: PC relative disp unhandled:" << MO << "\n";
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abort();
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}
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} else if (MO.isPhysicalRegister()) {
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// This is necessary because the Sparc doesn't actually lay out registers
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// in the real fashion -- it skips those that it chooses not to allocate,
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// i.e. those that are the SP, etc.
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unsigned fakeReg = MO.getReg(), realReg, regClass, regType;
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regType = TM->getRegInfo().getRegType(fakeReg);
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// At least map fakeReg into its class
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fakeReg = TM->getRegInfo().getClassRegNum(fakeReg, regClass);
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// Find the real register number for use in an instruction
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realReg = getRealRegNum(fakeReg, regClass);
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std::cerr << "Reg[" << std::dec << fakeReg << "] = " << realReg << "\n";
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rv = realReg;
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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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rv = (int64_t)
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(intptr_t)getGlobalAddress(cast<GlobalValue>(MO.getVRegValue()),
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MI, MO.isPCRelative());
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} else if (MO.isMachineBasicBlock()) {
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// Duplicate code of the above case for VirtualRegister, BasicBlock...
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// It should really hit this case, but Sparc backend uses VRegs instead
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std::cerr << "Saving reference to MBB\n";
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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.isExternalSymbol()) {
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// Sparc backend doesn't generate this (yet...)
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std::cerr << "ERROR: External symbol unhandled: " << MO << "\n";
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abort();
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} else if (MO.isFrameIndex()) {
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// Sparc backend doesn't generate this (yet...)
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int FrameIndex = MO.getFrameIndex();
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std::cerr << "ERROR: Frame index unhandled.\n";
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abort();
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} else if (MO.isConstantPoolIndex()) {
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// Sparc backend doesn't generate this (yet...)
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std::cerr << "ERROR: Constant Pool 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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// Finally, deal with the various bitfield-extracting functions that
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// are used in SPARC assembly. (Some of these make no sense in combination
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// with some of the above; we'll trust that the instruction selector
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// will not produce nonsense, and not check for valid combinations here.)
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if (MO.opLoBits32()) { // %lo(val)
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return rv & 0x03ff;
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} else if (MO.opHiBits32()) { // %lm(val)
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return (rv >> 10) & 0x03fffff;
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} else if (MO.opLoBits64()) { // %hm(val)
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return (rv >> 32) & 0x03ff;
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} else if (MO.opHiBits64()) { // %hh(val)
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return rv >> 42;
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} else { // (unadorned) val
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return rv;
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}
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}
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unsigned SparcV9CodeEmitter::getValueBit(int64_t Val, unsigned bit) {
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Val >>= bit;
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return (Val & 1);
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}
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void* SparcV9CodeEmitter::convertAddress(intptr_t Addr, bool isPCRelative) {
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if (isPCRelative) {
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return (void*)(Addr - (intptr_t)MCE->getCurrentPCValue());
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} else {
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return (void*)Addr;
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}
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}
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bool SparcV9CodeEmitter::runOnMachineFunction(MachineFunction &MF) {
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std::cerr << "Starting function " << MF.getFunction()->getName()
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<< ", address: " << "0x" << std::hex
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<< (long)MCE->getCurrentPCValue() << "\n";
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MCE->startFunction(MF);
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// FIXME: the Sparc backend does not use the ConstantPool!!
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//MCE->emitConstantPool(MF.getConstantPool());
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// Instead, the Sparc backend has its own constant pool implementation:
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const hash_set<const Constant*> &pool = MF.getInfo()->getConstantPoolValues();
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for (hash_set<const Constant*>::const_iterator I = pool.begin(),
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E = pool.end(); I != E; ++I)
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{
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const Constant *C = *I;
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// For now we just allocate some memory on the heap, this can be
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// dramatically improved.
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const Type *Ty = ((Value*)C)->getType();
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void *Addr = malloc(TM->getTargetData().getTypeSize(Ty));
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//FIXME
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//TheVM.InitializeMemory(C, Addr);
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std::cerr << "Adding ConstantMap[" << C << "]=" << std::dec << Addr << "\n";
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ConstantMap[C] = Addr;
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}
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for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
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emitBasicBlock(*I);
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MCE->finishFunction(MF);
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std::cerr << "Finishing function " << MF.getFunction()->getName() << "\n";
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ConstantMap.clear();
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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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std::cerr << "Fixup @" << std::hex << Ref << " to " << Location
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<< " in instr: " << std::dec << *MI << "\n";
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}
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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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std::cerr << "attempting to resolve BB: " << i << "\n";
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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 + (br target * 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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unsigned branchTarget = (Location - (long)Ref) >> 2;
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// Save the flags.
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bool loBits32=false, hiBits32=false, loBits64=false, hiBits64=false;
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if (op.opLoBits32()) { loBits32=true; }
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if (op.opHiBits32()) { hiBits32=true; }
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if (op.opLoBits64()) { loBits64=true; }
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if (op.opHiBits64()) { hiBits64=true; }
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MI->SetMachineOperandConst(ii, MachineOperand::MO_SignExtendedImmed,
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branchTarget);
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if (loBits32) { MI->setOperandLo32(ii); }
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else if (hiBits32) { MI->setOperandHi32(ii); }
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else if (loBits64) { MI->setOperandLo64(ii); }
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else if (hiBits64) { MI->setOperandHi64(ii); }
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std::cerr << "Rewrote BB ref: ";
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unsigned fixedInstr = SparcV9CodeEmitter::getBinaryCodeForInstr(*MI);
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*Ref = fixedInstr;
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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 SparcV9CodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
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currBB = MBB.getBasicBlock();
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BBLocations[currBB] = MCE->getCurrentPCValue();
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for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I)
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emitInstruction(**I);
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}
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void SparcV9CodeEmitter::emitInstruction(MachineInstr &MI) {
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emitConstant(getBinaryCodeForInstr(MI), 4);
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}
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void* SparcV9CodeEmitter::getGlobalAddress(GlobalValue *V, MachineInstr &MI,
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bool isPCRelative)
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{
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if (isPCRelative) { // must be a call, this is a major hack!
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// Try looking up the function to see if it is already compiled!
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if (void *Addr = (void*)(intptr_t)MCE->getGlobalValueAddress(V)) {
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intptr_t CurByte = MCE->getCurrentPCValue();
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// The real target of the call is Addr = PC + (target * 4)
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// CurByte is the PC, Addr we just received
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return (void*) (((long)Addr - (long)CurByte) >> 2);
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} else {
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if (Function *F = dyn_cast<Function>(V)) {
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// Function has not yet been code generated!
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TheJITResolver->addFunctionReference(MCE->getCurrentPCValue(),
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cast<Function>(V));
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// Delayed resolution...
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return
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(void*)(intptr_t)TheJITResolver->getLazyResolver(cast<Function>(V));
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} else if (Constant *C = ConstantPointerRef::get(V)) {
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if (ConstantMap.find(C) != ConstantMap.end()) {
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return ConstantMap[C];
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} else {
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std::cerr << "Constant: 0x" << std::hex << &*C << std::dec
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<< ", " << *V << " not found in ConstantMap!\n";
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abort();
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}
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#if 0
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} else if (const GlobalVariable *G = dyn_cast<GlobalVariable>(V)) {
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if (G->isConstant()) {
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const Constant* C = G->getInitializer();
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if (ConstantMap.find(C) != ConstantMap.end()) {
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return ConstantMap[C];
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} else {
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std::cerr << "Constant: " << *G << " not found in ConstantMap!\n";
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abort();
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}
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} else {
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std::cerr << "Variable: " << *G << " address not found!\n";
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abort();
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}
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#endif
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} else {
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std::cerr << "Unhandled global: " << *V << "\n";
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abort();
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}
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}
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} else {
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return convertAddress((intptr_t)MCE->getGlobalValueAddress(V),
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isPCRelative);
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}
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}
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#include "SparcV9CodeEmitter.inc"
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