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 /*

  * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.

  * Copyright 2007, 2008, 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 "asm/assembler.hpp"

 #include "assembler_zero.inline.hpp"

 #include "interpreter/interpreter.hpp"

 #include "nativeInst_zero.hpp"

 #include "oops/instanceOop.hpp"

 #include "oops/method.hpp"

 #include "oops/objArrayKlass.hpp"

 #include "oops/oop.inline.hpp"

 #include "prims/methodHandles.hpp"

 #include "runtime/frame.inline.hpp"

 #include "runtime/handles.inline.hpp"

 #include "runtime/sharedRuntime.hpp"

 #include "runtime/stubCodeGenerator.hpp"

 #include "runtime/stubRoutines.hpp"

 #include "runtime/thread.inline.hpp"

 #include "stack_zero.inline.hpp"

 #include "utilities/top.hpp"

 #ifdef COMPILER2

 #include "opto/runtime.hpp"

 #endif

 // Declaration and definition of StubGenerator (no .hpp file).

 // For a more detailed description of the stub routine structure

 // see the comment in stubRoutines.hpp

 class StubGenerator: public StubCodeGenerator {

  private:

   // The call stub is used to call Java from C

   static void call_stub(

     JavaCallWrapper *call_wrapper,

     intptr_t*        result,

     BasicType        result_type,

     Method*          method,

     address          entry_point,

     intptr_t*        parameters,

     int              parameter_words,

     TRAPS) {

     JavaThread *thread = (JavaThread *) THREAD;

     ZeroStack *stack = thread->zero_stack();

     // Make sure we have no pending exceptions

     assert(!HAS_PENDING_EXCEPTION, "call_stub called with pending exception");

     // Set up the stack if necessary

     bool stack_needs_teardown = false;

     if (stack->needs_setup()) {

       size_t zero_stack_size = stack->suggest_size(thread);

       stack->setup(alloca(zero_stack_size), zero_stack_size);

       stack_needs_teardown = true;

     }

     // Allocate and initialize our frame

     EntryFrame *frame =

       EntryFrame::build(parameters, parameter_words, call_wrapper, THREAD);

     if (!HAS_PENDING_EXCEPTION) {

       // Push the frame

       thread->push_zero_frame(frame);

       // Make the call

       Interpreter::invoke_method(method, entry_point, THREAD);

       // Store the result

       if (!HAS_PENDING_EXCEPTION) {

         switch (result_type) {

         case T_INT:

           *(jint *) result = *(jint *) stack->sp();

           break;

         case T_LONG:

           *(jlong *) result = *(jlong *) stack->sp();

           break;

         case T_FLOAT:

           *(jfloat *) result = *(jfloat *) stack->sp();

           break;

         case T_DOUBLE:

           *(jdouble *) result = *(jdouble *) stack->sp();

           break;

         case T_OBJECT:

           *(oop *) result = *(oop *) stack->sp();

           break;

         default:

           ShouldNotReachHere();

         }

       }

       // Unwind the frame

       thread->pop_zero_frame();

     }

     // Tear down the stack if necessary

     if (stack_needs_teardown)

       stack->teardown();

   }

   // These stubs get called from some dumb test routine.

   // I'll write them properly when they're called from

   // something that's actually doing something.

   static void fake_arraycopy_stub(address src, address dst, int count) {

     assert(count == 0, "huh?");

   }

   void generate_arraycopy_stubs() {

     // Call the conjoint generation methods immediately after

     // the disjoint ones so that short branches from the former

     // to the latter can be generated.

     StubRoutines::_jbyte_disjoint_arraycopy  = (address) fake_arraycopy_stub;

     StubRoutines::_jbyte_arraycopy           = (address) fake_arraycopy_stub;

     StubRoutines::_jshort_disjoint_arraycopy = (address) fake_arraycopy_stub;

     StubRoutines::_jshort_arraycopy          = (address) fake_arraycopy_stub;

     StubRoutines::_jint_disjoint_arraycopy   = (address) fake_arraycopy_stub;

     StubRoutines::_jint_arraycopy            = (address) fake_arraycopy_stub;

     StubRoutines::_jlong_disjoint_arraycopy  = (address) fake_arraycopy_stub;

     StubRoutines::_jlong_arraycopy           = (address) fake_arraycopy_stub;

     StubRoutines::_oop_disjoint_arraycopy    = ShouldNotCallThisStub();

     StubRoutines::_oop_arraycopy             = ShouldNotCallThisStub();

     StubRoutines::_checkcast_arraycopy       = ShouldNotCallThisStub();

     StubRoutines::_unsafe_arraycopy          = ShouldNotCallThisStub();

     StubRoutines::_generic_arraycopy         = ShouldNotCallThisStub();

     // We don't generate specialized code for HeapWord-aligned source

     // arrays, so just use the code we've already generated

     StubRoutines::_arrayof_jbyte_disjoint_arraycopy =

       StubRoutines::_jbyte_disjoint_arraycopy;

     StubRoutines::_arrayof_jbyte_arraycopy =

       StubRoutines::_jbyte_arraycopy;

     StubRoutines::_arrayof_jshort_disjoint_arraycopy =

       StubRoutines::_jshort_disjoint_arraycopy;

     StubRoutines::_arrayof_jshort_arraycopy =

       StubRoutines::_jshort_arraycopy;

     StubRoutines::_arrayof_jint_disjoint_arraycopy =

       StubRoutines::_jint_disjoint_arraycopy;

     StubRoutines::_arrayof_jint_arraycopy =

       StubRoutines::_jint_arraycopy;

     StubRoutines::_arrayof_jlong_disjoint_arraycopy =

       StubRoutines::_jlong_disjoint_arraycopy;

     StubRoutines::_arrayof_jlong_arraycopy =

       StubRoutines::_jlong_arraycopy;

     StubRoutines::_arrayof_oop_disjoint_arraycopy =

       StubRoutines::_oop_disjoint_arraycopy;

     StubRoutines::_arrayof_oop_arraycopy =

       StubRoutines::_oop_arraycopy;

   }

   static int SafeFetch32(int *adr, int errValue) {

     int value = errValue;

     value = *adr;

     return value;

   }

   static intptr_t SafeFetchN(intptr_t *adr, intptr_t errValue) {

     intptr_t value = errValue;

     value = *adr;

     return value;

   }

   void generate_initial() {

     // Generates all stubs and initializes the entry points

     // entry points that exist in all platforms Note: This is code

     // that could be shared among different platforms - however the

     // benefit seems to be smaller than the disadvantage of having a

     // much more complicated generator structure. See also comment in

     // stubRoutines.hpp.

     StubRoutines::_forward_exception_entry   = ShouldNotCallThisStub();

     StubRoutines::_call_stub_entry           = (address) call_stub;

     StubRoutines::_catch_exception_entry     = ShouldNotCallThisStub();

     // atomic calls

     StubRoutines::_atomic_xchg_entry         = ShouldNotCallThisStub();

     StubRoutines::_atomic_xchg_ptr_entry     = ShouldNotCallThisStub();

     StubRoutines::_atomic_cmpxchg_entry      = ShouldNotCallThisStub();

     StubRoutines::_atomic_cmpxchg_ptr_entry  = ShouldNotCallThisStub();

     StubRoutines::_atomic_cmpxchg_long_entry = ShouldNotCallThisStub();

     StubRoutines::_atomic_add_entry          = ShouldNotCallThisStub();

     StubRoutines::_atomic_add_ptr_entry      = ShouldNotCallThisStub();

     StubRoutines::_fence_entry               = ShouldNotCallThisStub();

     // amd64 does this here, sparc does it in generate_all()

     StubRoutines::_handler_for_unsafe_access_entry =

       ShouldNotCallThisStub();

   }

   void generate_all() {

     // Generates all stubs and initializes the entry points

     // These entry points require SharedInfo::stack0 to be set up in

     // non-core builds and need to be relocatable, so they each

     // fabricate a RuntimeStub internally.

     StubRoutines::_throw_AbstractMethodError_entry =

       ShouldNotCallThisStub();

     StubRoutines::_throw_NullPointerException_at_call_entry =

       ShouldNotCallThisStub();

     StubRoutines::_throw_StackOverflowError_entry =

       ShouldNotCallThisStub();

     // support for verify_oop (must happen after universe_init)

     StubRoutines::_verify_oop_subroutine_entry =

       ShouldNotCallThisStub();

     // arraycopy stubs used by compilers

     generate_arraycopy_stubs();

     // Safefetch stubs.

     StubRoutines::_safefetch32_entry = CAST_FROM_FN_PTR(address, StubGenerator::SafeFetch32);

     StubRoutines::_safefetch32_fault_pc = NULL;

     StubRoutines::_safefetch32_continuation_pc = NULL;

     StubRoutines::_safefetchN_entry = CAST_FROM_FN_PTR(address, StubGenerator::SafeFetchN);

     StubRoutines::_safefetchN_fault_pc = NULL;

     StubRoutines::_safefetchN_continuation_pc = NULL;

   }

  public:

   StubGenerator(CodeBuffer* code, bool all) : StubCodeGenerator(code) {

     if (all) {

       generate_all();

     } else {

       generate_initial();

     }

   }

 };

 void StubGenerator_generate(CodeBuffer* code, bool all) {

   StubGenerator g(code, all);

 }

 EntryFrame *EntryFrame::build(const intptr_t*  parameters,

                               int              parameter_words,

                               JavaCallWrapper* call_wrapper,

                               TRAPS) {

   ZeroStack *stack = ((JavaThread *) THREAD)->zero_stack();

   stack->overflow_check(header_words + parameter_words, CHECK_NULL);

   stack->push(0); // next_frame, filled in later

   intptr_t *fp = stack->sp();

   assert(fp - stack->sp() == next_frame_off, "should be");

   stack->push(ENTRY_FRAME);

   assert(fp - stack->sp() == frame_type_off, "should be");

   stack->push((intptr_t) call_wrapper);

   assert(fp - stack->sp() == call_wrapper_off, "should be");

   for (int i = 0; i < parameter_words; i++)

     stack->push(parameters[i]);

   return (EntryFrame *) fp;

 }