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 /*

  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.

  * Copyright 2008, 2009, 2010, 2011 Red Hat, Inc.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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  */

 #include "precompiled.hpp"

 #include "ci/ciEnv.hpp"

 #include "ci/ciMethod.hpp"

 #include "code/debugInfoRec.hpp"

 #include "code/dependencies.hpp"

 #include "code/exceptionHandlerTable.hpp"

 #include "code/oopRecorder.hpp"

 #include "compiler/abstractCompiler.hpp"

 #include "compiler/oopMap.hpp"

 #include "shark/llvmHeaders.hpp"

 #include "shark/sharkBuilder.hpp"

 #include "shark/sharkCodeBuffer.hpp"

 #include "shark/sharkCompiler.hpp"

 #include "shark/sharkContext.hpp"

 #include "shark/sharkEntry.hpp"

 #include "shark/sharkFunction.hpp"

 #include "shark/sharkMemoryManager.hpp"

 #include "shark/sharkNativeWrapper.hpp"

 #include "shark/shark_globals.hpp"

 #include "utilities/debug.hpp"

 #include <fnmatch.h>

 using namespace llvm;

 namespace {

   cl::opt<std::string>

   MCPU("mcpu");

   cl::list<std::string>

   MAttrs("mattr",

          cl::CommaSeparated);

 }

 SharkCompiler::SharkCompiler()

   : AbstractCompiler() {

   // Create the lock to protect the memory manager and execution engine

   _execution_engine_lock = new Monitor(Mutex::leaf, "SharkExecutionEngineLock");

   MutexLocker locker(execution_engine_lock());

   // Make LLVM safe for multithreading

   if (!llvm_start_multithreaded())

     fatal("llvm_start_multithreaded() failed");

   // Initialize the native target

   InitializeNativeTarget();

   // MCJIT require a native AsmPrinter

   InitializeNativeTargetAsmPrinter();

   // Create the two contexts which we'll use

   _normal_context = new SharkContext("normal");

   _native_context = new SharkContext("native");

   // Create the memory manager

   _memory_manager = new SharkMemoryManager();

   // Finetune LLVM for the current host CPU.

   StringMap<bool> Features;

   bool gotCpuFeatures = llvm::sys::getHostCPUFeatures(Features);

   std::string cpu("-mcpu=" + llvm::sys::getHostCPUName());

   std::vector<const char*> args;

   args.push_back(""); // program name

   args.push_back(cpu.c_str());

   std::string mattr("-mattr=");

   if(gotCpuFeatures){

     for(StringMap<bool>::iterator I = Features.begin(),

       E = Features.end(); I != E; ++I){

       if(I->second){

         std::string attr(I->first());

         mattr+="+"+attr+",";

       }

     }

     args.push_back(mattr.c_str());

   }

   args.push_back(0);  // terminator

   cl::ParseCommandLineOptions(args.size() - 1, (char **) &args[0]);

   // Create the JIT

   std::string ErrorMsg;

   EngineBuilder builder(_normal_context->module());

   builder.setMCPU(MCPU);

   builder.setMAttrs(MAttrs);

   builder.setJITMemoryManager(memory_manager());

   builder.setEngineKind(EngineKind::JIT);

   builder.setErrorStr(&ErrorMsg);

   if (! fnmatch(SharkOptimizationLevel, "None", 0)) {

     tty->print_cr("Shark optimization level set to: None");

     builder.setOptLevel(llvm::CodeGenOpt::None);

   } else if (! fnmatch(SharkOptimizationLevel, "Less", 0)) {

     tty->print_cr("Shark optimization level set to: Less");

     builder.setOptLevel(llvm::CodeGenOpt::Less);

   } else if (! fnmatch(SharkOptimizationLevel, "Aggressive", 0)) {

     tty->print_cr("Shark optimization level set to: Aggressive");

     builder.setOptLevel(llvm::CodeGenOpt::Aggressive);

   } // else Default is selected by, well, default :-)

   _execution_engine = builder.create();

   if (!execution_engine()) {

     if (!ErrorMsg.empty())

       printf("Error while creating Shark JIT: %s\n",ErrorMsg.c_str());

     else

       printf("Unknown error while creating Shark JIT\n");

     exit(1);

   }

   execution_engine()->addModule(_native_context->module());

   // All done

   set_state(initialized);

 }

 void SharkCompiler::initialize() {

   ShouldNotCallThis();

 }

 void SharkCompiler::compile_method(ciEnv*    env,

                                    ciMethod* target,

                                    int       entry_bci) {

   assert(is_initialized(), "should be");

   ResourceMark rm;

   const char *name = methodname(

     target->holder()->name()->as_utf8(), target->name()->as_utf8());

   // Do the typeflow analysis

   ciTypeFlow *flow;

   if (entry_bci == InvocationEntryBci)

     flow = target->get_flow_analysis();

   else

     flow = target->get_osr_flow_analysis(entry_bci);

   if (flow->failing())

     return;

   if (SharkPrintTypeflowOf != NULL) {

     if (!fnmatch(SharkPrintTypeflowOf, name, 0))

       flow->print_on(tty);

   }

   // Create the recorders

   Arena arena;

   env->set_oop_recorder(new OopRecorder(&arena));

   OopMapSet oopmaps;

   env->set_debug_info(new DebugInformationRecorder(env->oop_recorder()));

   env->debug_info()->set_oopmaps(&oopmaps);

   env->set_dependencies(new Dependencies(env));

   // Create the code buffer and builder

   CodeBuffer hscb("Shark", 256 * K, 64 * K);

   hscb.initialize_oop_recorder(env->oop_recorder());

   MacroAssembler *masm = new MacroAssembler(&hscb);

   SharkCodeBuffer cb(masm);

   SharkBuilder builder(&cb);

   // Emit the entry point

   SharkEntry *entry = (SharkEntry *) cb.malloc(sizeof(SharkEntry));

   // Build the LLVM IR for the method

   Function *function = SharkFunction::build(env, &builder, flow, name);

   if (env->failing()) {

     return;

   }

   // Generate native code.  It's unpleasant that we have to drop into

   // the VM to do this -- it blocks safepoints -- but I can't see any

   // other way to handle the locking.

   {

     ThreadInVMfromNative tiv(JavaThread::current());

     generate_native_code(entry, function, name);

   }

   // Install the method into the VM

   CodeOffsets offsets;

   offsets.set_value(CodeOffsets::Deopt, 0);

   offsets.set_value(CodeOffsets::Exceptions, 0);

   offsets.set_value(CodeOffsets::Verified_Entry,

                     target->is_static() ? 0 : wordSize);

   ExceptionHandlerTable handler_table;

   ImplicitExceptionTable inc_table;

   env->register_method(target,

                        entry_bci,

                        &offsets,

                        0,

                        &hscb,

                        0,

                        &oopmaps,

                        &handler_table,

                        &inc_table,

                        this,

                        env->comp_level(),

                        false,

                        false);

 }

 nmethod* SharkCompiler::generate_native_wrapper(MacroAssembler* masm,

                                                 methodHandle    target,

                                                 int             compile_id,

                                                 BasicType*      arg_types,

                                                 BasicType       return_type) {

   assert(is_initialized(), "should be");

   ResourceMark rm;

   const char *name = methodname(

     target->klass_name()->as_utf8(), target->name()->as_utf8());

   // Create the code buffer and builder

   SharkCodeBuffer cb(masm);

   SharkBuilder builder(&cb);

   // Emit the entry point

   SharkEntry *entry = (SharkEntry *) cb.malloc(sizeof(SharkEntry));

   // Build the LLVM IR for the method

   SharkNativeWrapper *wrapper = SharkNativeWrapper::build(

     &builder, target, name, arg_types, return_type);

   // Generate native code

   generate_native_code(entry, wrapper->function(), name);

   // Return the nmethod for installation in the VM

   return nmethod::new_native_nmethod(target,

                                      compile_id,

                                      masm->code(),

                                      0,

                                      0,

                                      wrapper->frame_size(),

                                      wrapper->receiver_offset(),

                                      wrapper->lock_offset(),

                                      wrapper->oop_maps());

 }

 void SharkCompiler::generate_native_code(SharkEntry* entry,

                                          Function*   function,

                                          const char* name) {

   // Print the LLVM bitcode, if requested

   if (SharkPrintBitcodeOf != NULL) {

     if (!fnmatch(SharkPrintBitcodeOf, name, 0))

       function->dump();

   }

   if (SharkVerifyFunction != NULL) {

     if (!fnmatch(SharkVerifyFunction, name, 0)) {

       verifyFunction(*function);

     }

   }

   // Compile to native code

   address code = NULL;

   context()->add_function(function);

   {

     MutexLocker locker(execution_engine_lock());

     free_queued_methods();

 #ifndef NDEBUG

 #if SHARK_LLVM_VERSION <= 31

 #define setCurrentDebugType SetCurrentDebugType

 #endif

     if (SharkPrintAsmOf != NULL) {

       if (!fnmatch(SharkPrintAsmOf, name, 0)) {

         llvm::setCurrentDebugType(X86_ONLY("x86-emitter") NOT_X86("jit"));

         llvm::DebugFlag = true;

       }

       else {

         llvm::setCurrentDebugType("");

         llvm::DebugFlag = false;

       }

     }

 #ifdef setCurrentDebugType

 #undef setCurrentDebugType

 #endif

 #endif // !NDEBUG

     memory_manager()->set_entry_for_function(function, entry);

     code = (address) execution_engine()->getPointerToFunction(function);

   }

   assert(code != NULL, "code must be != NULL");

   entry->set_entry_point(code);

   entry->set_function(function);

   entry->set_context(context());

   address code_start = entry->code_start();

   address code_limit = entry->code_limit();

   // Register generated code for profiling, etc

   if (JvmtiExport::should_post_dynamic_code_generated())

     JvmtiExport::post_dynamic_code_generated(name, code_start, code_limit);

   // Print debug information, if requested

   if (SharkTraceInstalls) {

     tty->print_cr(

       " [%p-%p): %s (%d bytes code)",

       code_start, code_limit, name, code_limit - code_start);

   }

 }

 void SharkCompiler::free_compiled_method(address code) {

   // This method may only be called when the VM is at a safepoint.

   // All _thread_in_vm threads will be waiting for the safepoint to

   // finish with the exception of the VM thread, so we can consider

   // ourself the owner of the execution engine lock even though we

   // can't actually acquire it at this time.

   assert(Thread::current()->is_Compiler_thread(), "must be called by compiler thread");

   assert_locked_or_safepoint(CodeCache_lock);

   SharkEntry *entry = (SharkEntry *) code;

   entry->context()->push_to_free_queue(entry->function());

 }

 void SharkCompiler::free_queued_methods() {

   // The free queue is protected by the execution engine lock

   assert(execution_engine_lock()->owned_by_self(), "should be");

   while (true) {

     Function *function = context()->pop_from_free_queue();

     if (function == NULL)

       break;

     execution_engine()->freeMachineCodeForFunction(function);

     function->eraseFromParent();

   }

 }

 const char* SharkCompiler::methodname(const char* klass, const char* method) {

   char *buf = NEW_RESOURCE_ARRAY(char, strlen(klass) + 2 + strlen(method) + 1);

   char *dst = buf;

   for (const char *c = klass; *c; c++) {

     if (*c == '/')

       *(dst++) = '.';

     else

       *(dst++) = *c;

   }

   *(dst++) = ':';

   *(dst++) = ':';

   for (const char *c = method; *c; c++) {

     *(dst++) = *c;

   }

   *(dst++) = '\0';

   return buf;

 }