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 /*

  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.

  * Copyright 2008, 2009, 2010 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

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "shark/llvmHeaders.hpp"

 #include "shark/sharkFunction.hpp"

 #include "shark/sharkNativeWrapper.hpp"

 #include "shark/sharkStack.hpp"

 #include "shark/sharkType.hpp"

 using namespace llvm;

 void SharkStack::initialize(Value* method) {

   bool setup_sp_and_method = (method != NULL);

   int locals_words  = max_locals();

   int extra_locals  = locals_words - arg_size();

   int header_words  = SharkFrame::header_words;

   int monitor_words = max_monitors()*frame::interpreter_frame_monitor_size();

   int stack_words   = max_stack();

   int frame_words   = header_words + monitor_words + stack_words;

   _extended_frame_size = frame_words + locals_words;

   // Update the stack pointer

   Value *stack_pointer = builder()->CreateSub(

     CreateLoadStackPointer(),

     LLVMValue::intptr_constant((frame_words + extra_locals) * wordSize));

   CreateStackOverflowCheck(stack_pointer);

   if (setup_sp_and_method)

     CreateStoreStackPointer(stack_pointer);

   // Create the frame

   _frame = builder()->CreateIntToPtr(

     stack_pointer,

     PointerType::getUnqual(

       ArrayType::get(SharkType::intptr_type(), extended_frame_size())),

     "frame");

   int offset = 0;

   // Expression stack

   _stack_slots_offset = offset;

   offset += stack_words;

   // Monitors

   _monitors_slots_offset = offset;

   offset += monitor_words;

   // Temporary oop slot

   _oop_tmp_slot_offset = offset++;

   // Method pointer

   _method_slot_offset = offset++;

   if (setup_sp_and_method) {

     builder()->CreateStore(

       method, slot_addr(method_slot_offset(), SharkType::methodOop_type()));

   }

   // Unextended SP

   builder()->CreateStore(stack_pointer, slot_addr(offset++));

   // PC

   _pc_slot_offset = offset++;

   // Frame header

   builder()->CreateStore(

     LLVMValue::intptr_constant(ZeroFrame::SHARK_FRAME), slot_addr(offset++));

   Value *fp = slot_addr(offset++);

   // Local variables

   _locals_slots_offset = offset;

   offset += locals_words;

   // Push the frame

   assert(offset == extended_frame_size(), "should do");

   builder()->CreateStore(CreateLoadFramePointer(), fp);

   CreateStoreFramePointer(

     builder()->CreatePtrToInt(fp, SharkType::intptr_type()));

 }

 // This function should match ZeroStack::overflow_check

 void SharkStack::CreateStackOverflowCheck(Value* sp) {

   BasicBlock *zero_ok  = CreateBlock("zero_stack_ok");

   BasicBlock *overflow = CreateBlock("stack_overflow");

   BasicBlock *abi_ok   = CreateBlock("abi_stack_ok");

   // Check the Zero stack

   builder()->CreateCondBr(

     builder()->CreateICmpULT(sp, stack_base()),

     overflow, zero_ok);

   // Check the ABI stack

   builder()->SetInsertPoint(zero_ok);

   Value *stack_top = builder()->CreateSub(

     builder()->CreateValueOfStructEntry(

       thread(),

       Thread::stack_base_offset(),

       SharkType::intptr_type(),

       "abi_base"),

     builder()->CreateValueOfStructEntry(

       thread(),

       Thread::stack_size_offset(),

       SharkType::intptr_type(),

       "abi_size"));

   Value *free_stack = builder()->CreateSub(

     builder()->CreatePtrToInt(

       builder()->CreateGetFrameAddress(),

       SharkType::intptr_type(),

       "abi_sp"),

     stack_top);

   builder()->CreateCondBr(

     builder()->CreateICmpULT(

       free_stack,

       LLVMValue::intptr_constant(StackShadowPages * os::vm_page_size())),

     overflow, abi_ok);

   // Handle overflows

   builder()->SetInsertPoint(overflow);

   builder()->CreateCall(builder()->throw_StackOverflowError(), thread());

   builder()->CreateRet(LLVMValue::jint_constant(0));

   builder()->SetInsertPoint(abi_ok);

 }

 Value* SharkStack::CreatePopFrame(int result_slots) {

   assert(result_slots >= 0 && result_slots <= 2, "should be");

   int locals_to_pop = max_locals() - result_slots;

   Value *fp = CreateLoadFramePointer();

   Value *sp = builder()->CreateAdd(

     fp,

     LLVMValue::intptr_constant((1 + locals_to_pop) * wordSize));

   CreateStoreStackPointer(sp);

   CreateStoreFramePointer(

     builder()->CreateLoad(

       builder()->CreateIntToPtr(

         fp, PointerType::getUnqual(SharkType::intptr_type()))));

   return sp;

 }

 Value* SharkStack::slot_addr(int         offset,

                              const Type* type,

                              const char* name) const {

   bool needs_cast = type && type != SharkType::intptr_type();

   Value* result = builder()->CreateStructGEP(

     _frame, offset, needs_cast ? "" : name);

   if (needs_cast) {

     result = builder()->CreateBitCast(

       result, PointerType::getUnqual(type), name);

   }

   return result;

 }

 // The bits that differentiate stacks with normal and native frames on top

 SharkStack* SharkStack::CreateBuildAndPushFrame(SharkFunction* function,

                                                 Value*         method) {

   return new SharkStackWithNormalFrame(function, method);

 }

 SharkStack* SharkStack::CreateBuildAndPushFrame(SharkNativeWrapper* wrapper,

                                                 Value*              method) {

   return new SharkStackWithNativeFrame(wrapper, method);

 }

 SharkStackWithNormalFrame::SharkStackWithNormalFrame(SharkFunction* function,

                                                      Value*         method)

   : SharkStack(function), _function(function) {

   // For normal frames, the stack pointer and the method slot will

   // be set during each decache, so it is not necessary to do them

   // at the time the frame is created.  However, we set them for

   // non-PRODUCT builds to make crash dumps easier to understand.

   initialize(PRODUCT_ONLY(NULL) NOT_PRODUCT(method));

 }

 SharkStackWithNativeFrame::SharkStackWithNativeFrame(SharkNativeWrapper* wrp,

                                                      Value*              method)

   : SharkStack(wrp), _wrapper(wrp) {

   initialize(method);

 }

 int SharkStackWithNormalFrame::arg_size() const {

   return function()->arg_size();

 }

 int SharkStackWithNativeFrame::arg_size() const {

   return wrapper()->arg_size();

 }

 int SharkStackWithNormalFrame::max_locals() const {

   return function()->max_locals();

 }

 int SharkStackWithNativeFrame::max_locals() const {

   return wrapper()->arg_size();

 }

 int SharkStackWithNormalFrame::max_stack() const {

   return function()->max_stack();

 }

 int SharkStackWithNativeFrame::max_stack() const {

   return 0;

 }

 int SharkStackWithNormalFrame::max_monitors() const {

   return function()->max_monitors();

 }

 int SharkStackWithNativeFrame::max_monitors() const {

   return wrapper()->is_synchronized() ? 1 : 0;

 }

 BasicBlock* SharkStackWithNormalFrame::CreateBlock(const char* name) const {

   return function()->CreateBlock(name);

 }

 BasicBlock* SharkStackWithNativeFrame::CreateBlock(const char* name) const {

   return wrapper()->CreateBlock(name);

 }

 address SharkStackWithNormalFrame::interpreter_entry_point() const {

   return (address) CppInterpreter::normal_entry;

 }

 address SharkStackWithNativeFrame::interpreter_entry_point() const {

   return (address) CppInterpreter::native_entry;

 }

 #ifndef PRODUCT

 void SharkStack::CreateAssertLastJavaSPIsNull() const {

 #ifdef ASSERT

   BasicBlock *fail = CreateBlock("assert_failed");

   BasicBlock *pass = CreateBlock("assert_ok");

   builder()->CreateCondBr(

     builder()->CreateICmpEQ(

       builder()->CreateLoad(last_Java_sp_addr()),

       LLVMValue::intptr_constant(0)),

     pass, fail);

   builder()->SetInsertPoint(fail);

   builder()->CreateShouldNotReachHere(__FILE__, __LINE__);

   builder()->CreateUnreachable();

   builder()->SetInsertPoint(pass);

 #endif // ASSERT

 }

 #endif // !PRODUCT