238 lines
7.9 KiB
C++
238 lines
7.9 KiB
C++
//===-- MCJIT.cpp - MC-based Just-in-Time Compiler ------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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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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//
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//===----------------------------------------------------------------------===//
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#include "MCJIT.h"
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#include "MCJITMemoryManager.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/ExecutionEngine/GenericValue.h"
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#include "llvm/ExecutionEngine/MCJIT.h"
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#include "llvm/ExecutionEngine/JITMemoryManager.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/DynamicLibrary.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Target/TargetData.h"
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using namespace llvm;
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namespace {
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static struct RegisterJIT {
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RegisterJIT() { MCJIT::Register(); }
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} JITRegistrator;
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}
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extern "C" void LLVMLinkInMCJIT() {
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}
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ExecutionEngine *MCJIT::createJIT(Module *M,
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std::string *ErrorStr,
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JITMemoryManager *JMM,
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bool GVsWithCode,
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TargetMachine *TM) {
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// Try to register the program as a source of symbols to resolve against.
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//
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// FIXME: Don't do this here.
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sys::DynamicLibrary::LoadLibraryPermanently(0, NULL);
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// If the target supports JIT code generation, create the JIT.
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if (TargetJITInfo *TJ = TM->getJITInfo())
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return new MCJIT(M, TM, *TJ, new MCJITMemoryManager(JMM, M), GVsWithCode);
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if (ErrorStr)
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*ErrorStr = "target does not support JIT code generation";
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return 0;
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}
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MCJIT::MCJIT(Module *m, TargetMachine *tm, TargetJITInfo &tji,
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RTDyldMemoryManager *MM, bool AllocateGVsWithCode)
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: ExecutionEngine(m), TM(tm), MemMgr(MM), M(m), OS(Buffer), Dyld(MM) {
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setTargetData(TM->getTargetData());
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PM.add(new TargetData(*TM->getTargetData()));
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// Turn the machine code intermediate representation into bytes in memory
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// that may be executed.
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if (TM->addPassesToEmitMC(PM, Ctx, OS, false)) {
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report_fatal_error("Target does not support MC emission!");
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}
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// Initialize passes.
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// FIXME: When we support multiple modules, we'll want to move the code
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// gen and finalization out of the constructor here and do it more
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// on-demand as part of getPointerToFunction().
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PM.run(*M);
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// Flush the output buffer so the SmallVector gets its data.
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OS.flush();
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// Load the object into the dynamic linker.
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MemoryBuffer *MB = MemoryBuffer::getMemBuffer(StringRef(Buffer.data(),
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Buffer.size()),
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"", false);
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if (Dyld.loadObject(MB))
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report_fatal_error(Dyld.getErrorString());
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// Resolve any relocations.
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Dyld.resolveRelocations();
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}
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MCJIT::~MCJIT() {
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delete MemMgr;
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delete TM;
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}
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void *MCJIT::getPointerToBasicBlock(BasicBlock *BB) {
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report_fatal_error("not yet implemented");
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}
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void *MCJIT::getPointerToFunction(Function *F) {
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if (F->isDeclaration() || F->hasAvailableExternallyLinkage()) {
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bool AbortOnFailure = !F->hasExternalWeakLinkage();
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void *Addr = getPointerToNamedFunction(F->getName(), AbortOnFailure);
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addGlobalMapping(F, Addr);
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return Addr;
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}
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// FIXME: Should we be using the mangler for this? Probably.
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StringRef BaseName = F->getName();
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if (BaseName[0] == '\1')
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return (void*)Dyld.getSymbolAddress(BaseName.substr(1));
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return (void*)Dyld.getSymbolAddress((TM->getMCAsmInfo()->getGlobalPrefix()
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+ BaseName).str());
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}
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void *MCJIT::recompileAndRelinkFunction(Function *F) {
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report_fatal_error("not yet implemented");
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}
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void MCJIT::freeMachineCodeForFunction(Function *F) {
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report_fatal_error("not yet implemented");
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}
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GenericValue MCJIT::runFunction(Function *F,
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const std::vector<GenericValue> &ArgValues) {
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assert(F && "Function *F was null at entry to run()");
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void *FPtr = getPointerToFunction(F);
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assert(FPtr && "Pointer to fn's code was null after getPointerToFunction");
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FunctionType *FTy = F->getFunctionType();
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Type *RetTy = FTy->getReturnType();
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assert((FTy->getNumParams() == ArgValues.size() ||
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(FTy->isVarArg() && FTy->getNumParams() <= ArgValues.size())) &&
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"Wrong number of arguments passed into function!");
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assert(FTy->getNumParams() == ArgValues.size() &&
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"This doesn't support passing arguments through varargs (yet)!");
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// Handle some common cases first. These cases correspond to common `main'
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// prototypes.
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if (RetTy->isIntegerTy(32) || RetTy->isVoidTy()) {
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switch (ArgValues.size()) {
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case 3:
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if (FTy->getParamType(0)->isIntegerTy(32) &&
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FTy->getParamType(1)->isPointerTy() &&
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FTy->getParamType(2)->isPointerTy()) {
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int (*PF)(int, char **, const char **) =
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(int(*)(int, char **, const char **))(intptr_t)FPtr;
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// Call the function.
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GenericValue rv;
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rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
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(char **)GVTOP(ArgValues[1]),
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(const char **)GVTOP(ArgValues[2])));
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return rv;
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}
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break;
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case 2:
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if (FTy->getParamType(0)->isIntegerTy(32) &&
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FTy->getParamType(1)->isPointerTy()) {
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int (*PF)(int, char **) = (int(*)(int, char **))(intptr_t)FPtr;
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// Call the function.
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GenericValue rv;
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rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
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(char **)GVTOP(ArgValues[1])));
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return rv;
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}
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break;
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case 1:
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if (FTy->getNumParams() == 1 &&
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FTy->getParamType(0)->isIntegerTy(32)) {
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GenericValue rv;
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int (*PF)(int) = (int(*)(int))(intptr_t)FPtr;
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rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue()));
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return rv;
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}
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break;
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}
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}
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// Handle cases where no arguments are passed first.
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if (ArgValues.empty()) {
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GenericValue rv;
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switch (RetTy->getTypeID()) {
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default: llvm_unreachable("Unknown return type for function call!");
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case Type::IntegerTyID: {
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unsigned BitWidth = cast<IntegerType>(RetTy)->getBitWidth();
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if (BitWidth == 1)
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rv.IntVal = APInt(BitWidth, ((bool(*)())(intptr_t)FPtr)());
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else if (BitWidth <= 8)
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rv.IntVal = APInt(BitWidth, ((char(*)())(intptr_t)FPtr)());
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else if (BitWidth <= 16)
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rv.IntVal = APInt(BitWidth, ((short(*)())(intptr_t)FPtr)());
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else if (BitWidth <= 32)
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rv.IntVal = APInt(BitWidth, ((int(*)())(intptr_t)FPtr)());
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else if (BitWidth <= 64)
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rv.IntVal = APInt(BitWidth, ((int64_t(*)())(intptr_t)FPtr)());
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else
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llvm_unreachable("Integer types > 64 bits not supported");
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return rv;
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}
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case Type::VoidTyID:
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rv.IntVal = APInt(32, ((int(*)())(intptr_t)FPtr)());
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return rv;
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case Type::FloatTyID:
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rv.FloatVal = ((float(*)())(intptr_t)FPtr)();
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return rv;
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case Type::DoubleTyID:
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rv.DoubleVal = ((double(*)())(intptr_t)FPtr)();
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return rv;
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case Type::X86_FP80TyID:
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case Type::FP128TyID:
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case Type::PPC_FP128TyID:
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llvm_unreachable("long double not supported yet");
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case Type::PointerTyID:
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return PTOGV(((void*(*)())(intptr_t)FPtr)());
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}
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}
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llvm_unreachable("Full-featured argument passing not supported yet!");
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}
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void *MCJIT::getPointerToNamedFunction(const std::string &Name,
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bool AbortOnFailure){
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if (!isSymbolSearchingDisabled() && MemMgr) {
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void *ptr = MemMgr->getPointerToNamedFunction(Name, false);
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if (ptr)
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return ptr;
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}
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/// If a LazyFunctionCreator is installed, use it to get/create the function.
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if (LazyFunctionCreator)
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if (void *RP = LazyFunctionCreator(Name))
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return RP;
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if (AbortOnFailure) {
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report_fatal_error("Program used external function '"+Name+
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"' which could not be resolved!");
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}
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return 0;
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}
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