354 lines
11 KiB
C++
354 lines
11 KiB
C++
/*
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* Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
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* Copyright 2009, 2010 Red Hat, Inc.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "shark/llvmHeaders.hpp"
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#include "shark/sharkNativeWrapper.hpp"
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#include "shark/sharkType.hpp"
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using namespace llvm;
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void SharkNativeWrapper::initialize(const char *name) {
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// Create the function
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_function = Function::Create(
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SharkType::entry_point_type(),
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GlobalVariable::InternalLinkage,
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name);
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// Get our arguments
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Function::arg_iterator ai = function()->arg_begin();
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Argument *method = ai++;
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method->setName("method");
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Argument *base_pc = ai++;
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base_pc->setName("base_pc");
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code_buffer()->set_base_pc(base_pc);
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Argument *thread = ai++;
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thread->setName("thread");
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set_thread(thread);
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// Create and push our stack frame
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builder()->SetInsertPoint(CreateBlock());
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_stack = SharkStack::CreateBuildAndPushFrame(this, method);
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NOT_PRODUCT(method = NULL);
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// Create the oopmap. We use the one oopmap for every call site in
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// the wrapper, which results in the odd mild inefficiency but is a
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// damn sight easier to code.
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OopMap *oopmap = new OopMap(
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SharkStack::oopmap_slot_munge(stack()->oopmap_frame_size()),
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SharkStack::oopmap_slot_munge(arg_size()));
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// Set up the oop_tmp slot if required:
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// - For static methods we use it to handlize the class argument
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// for the call, and to protect the same during slow path locks
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// (if synchronized).
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// - For methods returning oops, we use it to protect the return
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// value across safepoints or slow path unlocking.
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if (is_static() || is_returning_oop()) {
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_oop_tmp_slot = stack()->slot_addr(
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stack()->oop_tmp_slot_offset(),
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SharkType::oop_type(),
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"oop_tmp_slot");
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oopmap->set_oop(SharkStack::slot2reg(stack()->oop_tmp_slot_offset()));
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}
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// Set up the monitor slot, for synchronized methods
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if (is_synchronized()) {
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Unimplemented();
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_lock_slot_offset = 23;
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}
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// Start building the argument list
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std::vector<Type*> param_types;
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std::vector<Value*> param_values;
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PointerType *box_type = PointerType::getUnqual(SharkType::oop_type());
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// First argument is the JNIEnv
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param_types.push_back(SharkType::jniEnv_type());
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param_values.push_back(
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builder()->CreateAddressOfStructEntry(
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thread,
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JavaThread::jni_environment_offset(),
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SharkType::jniEnv_type(),
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"jni_environment"));
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// For static methods, the second argument is the class
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if (is_static()) {
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builder()->CreateStore(
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builder()->CreateInlineOop(
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JNIHandles::make_local(
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target()->method_holder()->java_mirror())),
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oop_tmp_slot());
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param_types.push_back(box_type);
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param_values.push_back(oop_tmp_slot());
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_receiver_slot_offset = stack()->oop_tmp_slot_offset();
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}
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else if (is_returning_oop()) {
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// The oop_tmp slot is registered in the oopmap,
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// so we need to clear it. This is one of the
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// mild inefficiencies I mentioned earlier.
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builder()->CreateStore(LLVMValue::null(), oop_tmp_slot());
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}
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// Parse the arguments
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for (int i = 0; i < arg_size(); i++) {
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int slot_offset = stack()->locals_slots_offset() + arg_size() - 1 - i;
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int adjusted_offset = slot_offset;
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BasicBlock *null, *not_null, *merge;
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Value *box;
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PHINode *phi;
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switch (arg_type(i)) {
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case T_VOID:
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break;
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case T_OBJECT:
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case T_ARRAY:
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null = CreateBlock("null");
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not_null = CreateBlock("not_null");
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merge = CreateBlock("merge");
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box = stack()->slot_addr(slot_offset, SharkType::oop_type());
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builder()->CreateCondBr(
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builder()->CreateICmp(
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ICmpInst::ICMP_EQ,
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builder()->CreateLoad(box),
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LLVMValue::null()),
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null, not_null);
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builder()->SetInsertPoint(null);
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builder()->CreateBr(merge);
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builder()->SetInsertPoint(not_null);
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builder()->CreateBr(merge);
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builder()->SetInsertPoint(merge);
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phi = builder()->CreatePHI(box_type, 0, "boxed_object");
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phi->addIncoming(ConstantPointerNull::get(box_type), null);
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phi->addIncoming(box, not_null);
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box = phi;
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param_types.push_back(box_type);
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param_values.push_back(box);
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oopmap->set_oop(SharkStack::slot2reg(slot_offset));
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if (i == 0 && !is_static())
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_receiver_slot_offset = slot_offset;
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break;
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case T_LONG:
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case T_DOUBLE:
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adjusted_offset--;
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// fall through
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default:
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Type *param_type = SharkType::to_stackType(arg_type(i));
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param_types.push_back(param_type);
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param_values.push_back(
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builder()->CreateLoad(stack()->slot_addr(adjusted_offset, param_type)));
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}
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}
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// The oopmap is now complete, and everything is written
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// into the frame except the PC.
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int pc_offset = code_buffer()->create_unique_offset();
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_oop_maps = new OopMapSet();
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oop_maps()->add_gc_map(pc_offset, oopmap);
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builder()->CreateStore(
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builder()->code_buffer_address(pc_offset),
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stack()->slot_addr(stack()->pc_slot_offset()));
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// Set up the Java frame anchor
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stack()->CreateSetLastJavaFrame();
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// Lock if necessary
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if (is_synchronized())
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Unimplemented();
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// Change the thread state to _thread_in_native
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CreateSetThreadState(_thread_in_native);
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// Make the call
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BasicType result_type = target()->result_type();
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Type* return_type;
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if (result_type == T_VOID)
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return_type = SharkType::void_type();
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else if (is_returning_oop())
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return_type = box_type;
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else
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return_type = SharkType::to_arrayType(result_type);
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Value* native_function = builder()->CreateIntToPtr(
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LLVMValue::intptr_constant((intptr_t) target()->native_function()),
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PointerType::getUnqual(
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FunctionType::get(return_type, param_types, false)));
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Value *result = builder()->CreateCall(
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native_function, llvm::makeArrayRef(param_values));
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// Start the transition back to _thread_in_Java
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CreateSetThreadState(_thread_in_native_trans);
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// Make sure new state is visible in the GC thread
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if (os::is_MP()) {
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if (UseMembar)
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builder()->CreateFence(llvm::SequentiallyConsistent, llvm::CrossThread);
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else
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CreateWriteMemorySerializePage();
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}
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// Handle safepoint operations, pending suspend requests,
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// and pending asynchronous exceptions.
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BasicBlock *check_thread = CreateBlock("check_thread");
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BasicBlock *do_safepoint = CreateBlock("do_safepoint");
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BasicBlock *safepointed = CreateBlock("safepointed");
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Value *global_state = builder()->CreateLoad(
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builder()->CreateIntToPtr(
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LLVMValue::intptr_constant(
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(intptr_t) SafepointSynchronize::address_of_state()),
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PointerType::getUnqual(SharkType::jint_type())),
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"global_state");
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builder()->CreateCondBr(
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builder()->CreateICmpNE(
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global_state,
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LLVMValue::jint_constant(SafepointSynchronize::_not_synchronized)),
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do_safepoint, check_thread);
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builder()->SetInsertPoint(check_thread);
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Value *thread_state = builder()->CreateValueOfStructEntry(
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thread,
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JavaThread::suspend_flags_offset(),
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SharkType::jint_type(),
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"thread_state");
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builder()->CreateCondBr(
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builder()->CreateICmpNE(
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thread_state,
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LLVMValue::jint_constant(0)),
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do_safepoint, safepointed);
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builder()->SetInsertPoint(do_safepoint);
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builder()->CreateCall(
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builder()->check_special_condition_for_native_trans(), thread);
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builder()->CreateBr(safepointed);
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// Finally we can change the thread state to _thread_in_Java
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builder()->SetInsertPoint(safepointed);
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CreateSetThreadState(_thread_in_Java);
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// Clear the frame anchor
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stack()->CreateResetLastJavaFrame();
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// If there is a pending exception then we can just unwind and
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// return. It seems totally wrong that unlocking is skipped here
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// but apparently the template interpreter does this so we do too.
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BasicBlock *exception = CreateBlock("exception");
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BasicBlock *no_exception = CreateBlock("no_exception");
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builder()->CreateCondBr(
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builder()->CreateICmpEQ(
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CreateLoadPendingException(),
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LLVMValue::null()),
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no_exception, exception);
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builder()->SetInsertPoint(exception);
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CreateResetHandleBlock();
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stack()->CreatePopFrame(0);
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builder()->CreateRet(LLVMValue::jint_constant(0));
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builder()->SetInsertPoint(no_exception);
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// If the result was an oop then unbox it before
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// releasing the handle it might be protected by
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if (is_returning_oop()) {
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BasicBlock *null = builder()->GetInsertBlock();
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BasicBlock *not_null = CreateBlock("not_null");
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BasicBlock *merge = CreateBlock("merge");
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builder()->CreateCondBr(
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builder()->CreateICmpNE(result, ConstantPointerNull::get(box_type)),
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not_null, merge);
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builder()->SetInsertPoint(not_null);
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Value *unboxed_result = builder()->CreateLoad(result);
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builder()->CreateBr(merge);
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builder()->SetInsertPoint(merge);
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PHINode *phi = builder()->CreatePHI(SharkType::oop_type(), 0, "result");
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phi->addIncoming(LLVMValue::null(), null);
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phi->addIncoming(unboxed_result, not_null);
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result = phi;
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}
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// Reset handle block
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CreateResetHandleBlock();
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// Unlock if necessary.
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if (is_synchronized())
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Unimplemented();
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// Unwind and return
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Value *result_addr = stack()->CreatePopFrame(type2size[result_type]);
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if (result_type != T_VOID) {
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bool needs_cast = false;
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bool is_signed = false;
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switch (result_type) {
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case T_BOOLEAN:
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result = builder()->CreateICmpNE(result, LLVMValue::jbyte_constant(0));
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needs_cast = true;
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break;
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case T_CHAR:
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needs_cast = true;
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break;
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case T_BYTE:
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case T_SHORT:
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needs_cast = true;
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is_signed = true;
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break;
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}
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if (needs_cast) {
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result = builder()->CreateIntCast(
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result, SharkType::to_stackType(result_type), is_signed);
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}
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builder()->CreateStore(
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result,
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builder()->CreateIntToPtr(
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result_addr,
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PointerType::getUnqual(SharkType::to_stackType(result_type))));
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}
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builder()->CreateRet(LLVMValue::jint_constant(0));
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}
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