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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.

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  */

 #ifndef SHARE_VM_SHARK_SHARKSTACK_HPP

 #define SHARE_VM_SHARK_SHARKSTACK_HPP

 #include "shark/llvmHeaders.hpp"

 #include "shark/sharkInvariants.hpp"

 #include "shark/sharkType.hpp"

 class SharkFunction;

 class SharkNativeWrapper;

 class SharkStackWithNormalFrame;

 class SharkStackWithNativeFrame;

 class SharkStack : public SharkCompileInvariants {

  public:

   static SharkStack* CreateBuildAndPushFrame(

     SharkFunction* function, llvm::Value* method);

   static SharkStack* CreateBuildAndPushFrame(

     SharkNativeWrapper* wrapper, llvm::Value* method);

  protected:

   SharkStack(const SharkCompileInvariants* parent)

     : SharkCompileInvariants(parent) {}

  protected:

   void initialize(llvm::Value* method);

  protected:

   void CreateStackOverflowCheck(llvm::Value* sp);

   // Properties of the method being compiled

  protected:

   virtual int arg_size() const = 0;

   virtual int max_locals() const = 0;

   virtual int max_stack() const = 0;

   virtual int max_monitors() const = 0;

   // BasicBlock creation

  protected:

   virtual llvm::BasicBlock* CreateBlock(const char* name = "") const = 0;

   // Interpreter entry point for bailouts

  protected:

   virtual address interpreter_entry_point() const = 0;

   // Interface with the Zero stack

  private:

   llvm::Value* zero_stack() const {

     return builder()->CreateAddressOfStructEntry(

       thread(),

       JavaThread::zero_stack_offset(),

       SharkType::zeroStack_type(),

       "zero_stack");

   }

   llvm::Value* stack_base() const {

     return builder()->CreateValueOfStructEntry(

       zero_stack(),

       ZeroStack::base_offset(),

       SharkType::intptr_type(),

       "stack_base");

   }

   llvm::Value* stack_pointer_addr() const {

     return builder()->CreateAddressOfStructEntry(

       zero_stack(),

       ZeroStack::sp_offset(),

       llvm::PointerType::getUnqual(SharkType::intptr_type()),

       "stack_pointer_addr");

   }

   llvm::Value* frame_pointer_addr() const {

     return builder()->CreateAddressOfStructEntry(

       thread(),

       JavaThread::top_zero_frame_offset(),

       llvm::PointerType::getUnqual(SharkType::intptr_type()),

       "frame_pointer_addr");

   }

  public:

   llvm::LoadInst* CreateLoadStackPointer(const char *name = "") {

     return builder()->CreateLoad(stack_pointer_addr(), name);

   }

   llvm::StoreInst* CreateStoreStackPointer(llvm::Value* value) {

     return builder()->CreateStore(value, stack_pointer_addr());

   }

   llvm::LoadInst* CreateLoadFramePointer(const char *name = "") {

     return builder()->CreateLoad(frame_pointer_addr(), name);

   }

   llvm::StoreInst* CreateStoreFramePointer(llvm::Value* value) {

     return builder()->CreateStore(value, frame_pointer_addr());

   }

   llvm::Value* CreatePopFrame(int result_slots);

   // Interface with the frame anchor

  private:

   llvm::Value* last_Java_sp_addr() const {

     return builder()->CreateAddressOfStructEntry(

       thread(),

       JavaThread::last_Java_sp_offset(),

       llvm::PointerType::getUnqual(SharkType::intptr_type()),

       "last_Java_sp_addr");

   }

   llvm::Value* last_Java_fp_addr() const {

     return builder()->CreateAddressOfStructEntry(

       thread(),

       JavaThread::last_Java_fp_offset(),

       llvm::PointerType::getUnqual(SharkType::intptr_type()),

       "last_Java_fp_addr");

   }

  public:

   void CreateSetLastJavaFrame() {

     // Note that whenever _last_Java_sp != NULL other anchor fields

     // must be valid.  The profiler apparently depends on this.

     NOT_PRODUCT(CreateAssertLastJavaSPIsNull());

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

     // XXX There's last_Java_pc as well, but I don't think anything uses it

     // Also XXX: should we fence here?  Zero doesn't...

     builder()->CreateStore(CreateLoadStackPointer(), last_Java_sp_addr());

     // Also also XXX: we could probably cache the sp (and the fp we know??)

   }

   void CreateResetLastJavaFrame() {

     builder()->CreateStore(LLVMValue::intptr_constant(0), last_Java_sp_addr());

   }

  private:

   void CreateAssertLastJavaSPIsNull() const PRODUCT_RETURN;

   // Our method's frame

  private:

   llvm::Value* _frame;

   int          _extended_frame_size;

   int          _stack_slots_offset;

  public:

   int extended_frame_size() const {

     return _extended_frame_size;

   }

   int oopmap_frame_size() const {

     return extended_frame_size() - arg_size();

   }

   // Offsets of things in the frame

  private:

   int _monitors_slots_offset;

   int _oop_tmp_slot_offset;

   int _method_slot_offset;

   int _pc_slot_offset;

   int _locals_slots_offset;

  public:

   int stack_slots_offset() const {

     return _stack_slots_offset;

   }

   int oop_tmp_slot_offset() const {

     return _oop_tmp_slot_offset;

   }

   int method_slot_offset() const {

     return _method_slot_offset;

   }

   int pc_slot_offset() const {

     return _pc_slot_offset;

   }

   int locals_slots_offset() const {

     return _locals_slots_offset;

   }

   int monitor_offset(int index) const {

     assert(index >= 0 && index < max_monitors(), "invalid monitor index");

     return _monitors_slots_offset +

       (max_monitors() - 1 - index) * frame::interpreter_frame_monitor_size();

   }

   int monitor_object_offset(int index) const {

     return monitor_offset(index) +

       (BasicObjectLock::obj_offset_in_bytes() >> LogBytesPerWord);

   }

   int monitor_header_offset(int index) const {

     return monitor_offset(index) +

       ((BasicObjectLock::lock_offset_in_bytes() +

         BasicLock::displaced_header_offset_in_bytes()) >> LogBytesPerWord);

   }

   // Addresses of things in the frame

  public:

   llvm::Value* slot_addr(int               offset,

                          llvm::Type* type = NULL,

                          const char*       name = "") const;

   llvm::Value* monitor_addr(int index) const {

     return slot_addr(

       monitor_offset(index),

       SharkType::monitor_type(),

       "monitor");

   }

   llvm::Value* monitor_object_addr(int index) const {

     return slot_addr(

       monitor_object_offset(index),

       SharkType::oop_type(),

       "object_addr");

   }

   llvm::Value* monitor_header_addr(int index) const {

     return slot_addr(

       monitor_header_offset(index),

       SharkType::intptr_type(),

       "displaced_header_addr");

   }

   // oopmap helpers

  public:

   static int oopmap_slot_munge(int offset) {

     return offset << (LogBytesPerWord - LogBytesPerInt);

   }

   static VMReg slot2reg(int offset) {

     return VMRegImpl::stack2reg(oopmap_slot_munge(offset));

   }

 };

 class SharkStackWithNormalFrame : public SharkStack {

   friend class SharkStack;

  protected:

   SharkStackWithNormalFrame(SharkFunction* function, llvm::Value* method);

  private:

   SharkFunction* _function;

  private:

   SharkFunction* function() const {

     return _function;

   }

   // Properties of the method being compiled

  private:

   int arg_size() const;

   int max_locals() const;

   int max_stack() const;

   int max_monitors() const;

   // BasicBlock creation

  private:

   llvm::BasicBlock* CreateBlock(const char* name = "") const;

   // Interpreter entry point for bailouts

  private:

   address interpreter_entry_point() const;

 };

 class SharkStackWithNativeFrame : public SharkStack {

   friend class SharkStack;

  protected:

   SharkStackWithNativeFrame(SharkNativeWrapper* wrapper, llvm::Value* method);

  private:

   SharkNativeWrapper* _wrapper;

  private:

   SharkNativeWrapper* wrapper() const {

     return _wrapper;

   }

   // Properties of the method being compiled

  private:

   int arg_size() const;

   int max_locals() const;

   int max_stack() const;

   int max_monitors() const;

   // BasicBlock creation

  private:

   llvm::BasicBlock* CreateBlock(const char* name = "") const;

   // Interpreter entry point for bailouts

  private:

   address interpreter_entry_point() const;

 };

 #endif // SHARE_VM_SHARK_SHARKSTACK_HPP