Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

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

  * 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.

  *

  */

 // These classes represent the stack-map substructures described in the JVMS

 // (hence the non-conforming naming scheme).

 // These classes work with the types in their compressed form in-place (as they

 // would appear in the classfile).  No virtual methods or fields allowed.

 class verification_type_info {

  private:

   // u1 tag

   // u2 cpool_index || u2 bci (for ITEM_Object & ITEM_Uninitailized only)

   address tag_addr() const { return (address)this; }

   address cpool_index_addr() const { return tag_addr() + sizeof(u1); }

   address bci_addr() const { return cpool_index_addr(); }

  protected:

   // No constructors  - should be 'private', but GCC issues a warning if it is

   verification_type_info() {}

   verification_type_info(const verification_type_info&) {}

  public:

   static verification_type_info* at(address addr) {

     return (verification_type_info*)addr;

   }

   static verification_type_info* create_at(address addr, u1 tag) {

     verification_type_info* vti = (verification_type_info*)addr;

     vti->set_tag(tag);

     return vti;

   }

   static verification_type_info* create_object_at(address addr, u2 cp_idx) {

     verification_type_info* vti = (verification_type_info*)addr;

     vti->set_tag(ITEM_Object);

     vti->set_cpool_index(cp_idx);

     return vti;

   }

   static verification_type_info* create_uninit_at(address addr, u2 bci) {

     verification_type_info* vti = (verification_type_info*)addr;

     vti->set_tag(ITEM_Uninitialized);

     vti->set_bci(bci);

     return vti;

   }

   static size_t calculate_size(u1 tag) {

     if (tag == ITEM_Object || tag == ITEM_Uninitialized) {

       return sizeof(u1) + sizeof(u2);

     } else {

       return sizeof(u1);

     }

   }

   static size_t max_size() { return sizeof(u1) + sizeof(u2); }

   u1 tag() const { return *(u1*)tag_addr(); }

   void set_tag(u1 tag) { *((u1*)tag_addr()) = tag; }

   bool is_object() const { return tag() == ITEM_Object; }

   bool is_uninitialized() const { return tag() == ITEM_Uninitialized; }

   u2 cpool_index() const {

     assert(is_object(), "This type has no cp_index");

     return Bytes::get_Java_u2(cpool_index_addr());

   }

   void set_cpool_index(u2 idx) {

     assert(is_object(), "This type has no cp_index");

     Bytes::put_Java_u2(cpool_index_addr(), idx);

   }

   u2 bci() const {

     assert(is_uninitialized(), "This type has no bci");

     return Bytes::get_Java_u2(bci_addr());

   }

   void set_bci(u2 bci) {

     assert(is_uninitialized(), "This type has no bci");

     Bytes::put_Java_u2(bci_addr(), bci);

   }

   void copy_from(verification_type_info* from) {

     set_tag(from->tag());

     if (from->is_object()) {

       set_cpool_index(from->cpool_index());

     } else if (from->is_uninitialized()) {

       set_bci(from->bci());

     }

   }

   size_t size() const {

     return calculate_size(tag());

   }

   verification_type_info* next() {

     return (verification_type_info*)((address)this + size());

   }

   // This method is used when reading unverified data in order to ensure

   // that we don't read past a particular memory limit.  It returns false

   // if any part of the data structure is outside the specified memory bounds.

   bool verify(address start, address end) {

     return ((address)this >= start &&

             (address)this < end &&

             (bci_addr() + sizeof(u2) <= end ||

                 !is_object() && !is_uninitialized()));

   }

 #ifdef ASSERT

   void print_on(outputStream* st) {

     switch (tag()) {

       case ITEM_Top: st->print("Top"); break;

       case ITEM_Integer: st->print("Integer"); break;

       case ITEM_Float: st->print("Float"); break;

       case ITEM_Double: st->print("Double"); break;

       case ITEM_Long: st->print("Long"); break;

       case ITEM_Null: st->print("Null"); break;

       case ITEM_UninitializedThis:

         st->print("UninitializedThis"); break;

       case ITEM_Uninitialized:

         st->print("Uninitialized[#%d]", bci()); break;

       case ITEM_Object:

         st->print("Object[#%d]", cpool_index()); break;

       default:

         assert(false, "Bad verification_type_info");

     }

   }

 #endif

 };

 #define FOR_EACH_STACKMAP_FRAME_TYPE(macro, arg1, arg2) \

   macro(same_frame, arg1, arg2) \

   macro(same_frame_extended, arg1, arg2) \

   macro(same_frame_1_stack_item_frame, arg1, arg2) \

   macro(same_frame_1_stack_item_extended, arg1, arg2) \

   macro(chop_frame, arg1, arg2) \

   macro(append_frame, arg1, arg2) \

   macro(full_frame, arg1, arg2)

 #define SM_FORWARD_DECL(type, arg1, arg2) class type;

 FOR_EACH_STACKMAP_FRAME_TYPE(SM_FORWARD_DECL, x, x)

 #undef SM_FORWARD_DECL

 class stack_map_frame {

  protected:

   address frame_type_addr() const { return (address)this; }

   // No constructors  - should be 'private', but GCC issues a warning if it is

   stack_map_frame() {}

   stack_map_frame(const stack_map_frame&) {}

  public:

   static stack_map_frame* at(address addr) {

     return (stack_map_frame*)addr;

   }

   stack_map_frame* next() const {

     return at((address)this + size());

   }

   u1 frame_type() const { return *(u1*)frame_type_addr(); }

   void set_frame_type(u1 type) { *((u1*)frame_type_addr()) = type; }

   // pseudo-virtual methods

   inline size_t size() const;

   inline int offset_delta() const;

   inline void set_offset_delta(int offset_delta);

   inline int number_of_types() const; // number of types contained in the frame

   inline verification_type_info* types() const; // pointer to first type

   inline bool is_valid_offset(int offset_delta) const;

   // This method must be used when reading unverified data in order to ensure

   // that we don't read past a particular memory limit.  It returns false

   // if any part of the data structure is outside the specified memory bounds.

   inline bool verify(address start, address end) const;

 #ifdef ASSERT

   inline void print_on(outputStream* st) const;

 #endif

   // Create as_xxx and is_xxx methods for the subtypes

 #define FRAME_TYPE_DECL(stackmap_frame_type, arg1, arg2) \

   inline stackmap_frame_type* as_##stackmap_frame_type() const; \

   bool is_##stackmap_frame_type() { \

     return as_##stackmap_frame_type() != NULL; \

   }

   FOR_EACH_STACKMAP_FRAME_TYPE(FRAME_TYPE_DECL, x, x)

 #undef FRAME_TYPE_DECL

 };

 class same_frame : public stack_map_frame {

  private:

   static int frame_type_to_offset_delta(u1 frame_type) {

       return frame_type + 1; }

   static u1 offset_delta_to_frame_type(int offset_delta) {

       return (u1)(offset_delta - 1); }

  public:

   static bool is_frame_type(u1 tag) {

     return tag < 64;

   }

   static same_frame* at(address addr) {

     assert(is_frame_type(*addr), "Wrong frame id");

     return (same_frame*)addr;

   }

   static same_frame* create_at(address addr, int offset_delta) {

     same_frame* sm = (same_frame*)addr;

     sm->set_offset_delta(offset_delta);

     return sm;

   }

   static size_t calculate_size() { return sizeof(u1); }

   size_t size() const { return calculate_size(); }

   int offset_delta() const { return frame_type_to_offset_delta(frame_type()); }

   void set_offset_delta(int offset_delta) {

     assert(offset_delta <= 64, "Offset too large for same_frame");

     set_frame_type(offset_delta_to_frame_type(offset_delta));

   }

   int number_of_types() const { return 0; }

   verification_type_info* types() const { return NULL; }

   bool is_valid_offset(int offset_delta) const {

     return is_frame_type(offset_delta_to_frame_type(offset_delta));

   }

   bool verify_subtype(address start, address end) const {

     return true;

   }

 #ifdef ASSERT

   void print_on(outputStream* st) const {

     st->print("same_frame(%d)", offset_delta());

   }

 #endif

 };

 class same_frame_extended : public stack_map_frame {

  private:

   enum { _frame_id = 251 };

   address offset_delta_addr() const { return frame_type_addr() + sizeof(u1); }

  public:

   static bool is_frame_type(u1 tag) {

     return tag == _frame_id;

   }

   static same_frame_extended* at(address addr) {

     assert(is_frame_type(*addr), "Wrong frame type");

     return (same_frame_extended*)addr;

   }

   static same_frame_extended* create_at(address addr, u2 offset_delta) {

     same_frame_extended* sm = (same_frame_extended*)addr;

     sm->set_frame_type(_frame_id);

     sm->set_offset_delta(offset_delta);

     return sm;

   }

   static size_t calculate_size() { return sizeof(u1) + sizeof(u2); }

   size_t size() const { return calculate_size(); }

   int offset_delta() const {

     return Bytes::get_Java_u2(offset_delta_addr()) + 1;

   }

   void set_offset_delta(int offset_delta) {

     Bytes::put_Java_u2(offset_delta_addr(), offset_delta - 1);

   }

   int number_of_types() const { return 0; }

   verification_type_info* types() const { return NULL; }

   bool is_valid_offset(int offset) const { return true; }

   bool verify_subtype(address start, address end) const {

     return frame_type_addr() + size() <= end;

   }

 #ifdef ASSERT

   void print_on(outputStream* st) const {

     st->print("same_frame_extended(%d)", offset_delta());

   }

 #endif

 };

 class same_frame_1_stack_item_frame : public stack_map_frame {

  private:

   address type_addr() const { return frame_type_addr() + sizeof(u1); }

   static int frame_type_to_offset_delta(u1 frame_type) {

       return frame_type - 63; }

   static u1 offset_delta_to_frame_type(int offset_delta) {

       return (u1)(offset_delta + 63); }

  public:

   static bool is_frame_type(u1 tag) {

     return tag >= 64 && tag < 128;

   }

   static same_frame_1_stack_item_frame* at(address addr) {

     assert(is_frame_type(*addr), "Wrong frame id");

     return (same_frame_1_stack_item_frame*)addr;

   }

   static same_frame_1_stack_item_frame* create_at(

       address addr, int offset_delta, verification_type_info* vti) {

     same_frame_1_stack_item_frame* sm = (same_frame_1_stack_item_frame*)addr;

     sm->set_offset_delta(offset_delta);

     if (vti != NULL) {

       sm->set_type(vti);

     }

     return sm;

   }

   static size_t calculate_size(verification_type_info* vti) {

     return sizeof(u1) + vti->size();

   }

   static size_t max_size() {

     return sizeof(u1) + verification_type_info::max_size();

   }

   size_t size() const { return calculate_size(types()); }

   int offset_delta() const { return frame_type_to_offset_delta(frame_type()); }

   void set_offset_delta(int offset_delta) {

     assert(offset_delta > 0 && offset_delta <= 64,

            "Offset too large for this frame type");

     set_frame_type(offset_delta_to_frame_type(offset_delta));

   }

   void set_type(verification_type_info* vti) {

     verification_type_info* cur = types();

     cur->copy_from(vti);

   }

   int number_of_types() const { return 1; }

   verification_type_info* types() const {

     return verification_type_info::at(type_addr());

   }

   bool is_valid_offset(int offset_delta) const {

     return is_frame_type(offset_delta_to_frame_type(offset_delta));

   }

   bool verify_subtype(address start, address end) const {

     return types()->verify(start, end);

   }

 #ifdef ASSERT

   void print_on(outputStream* st) const {

     st->print("same_frame_1_stack_item_frame(%d,", offset_delta());

     types()->print_on(st);

     st->print(")");

   }

 #endif

 };

 class same_frame_1_stack_item_extended : public stack_map_frame {

  private:

   address offset_delta_addr() const { return frame_type_addr() + sizeof(u1); }

   address type_addr() const { return offset_delta_addr() + sizeof(u2); }

   enum { _frame_id = 247 };

  public:

   static bool is_frame_type(u1 tag) {

     return tag == _frame_id;

   }

   static same_frame_1_stack_item_extended* at(address addr) {

     assert(is_frame_type(*addr), "Wrong frame id");

     return (same_frame_1_stack_item_extended*)addr;

   }

   static same_frame_1_stack_item_extended* create_at(

       address addr, int offset_delta, verification_type_info* vti) {

     same_frame_1_stack_item_extended* sm =

        (same_frame_1_stack_item_extended*)addr;

     sm->set_frame_type(_frame_id);

     sm->set_offset_delta(offset_delta);

     if (vti != NULL) {

       sm->set_type(vti);

     }

     return sm;

   }

   static size_t calculate_size(verification_type_info* vti) {

     return sizeof(u1) + sizeof(u2) + vti->size();

   }

   size_t size() const { return calculate_size(types()); }

   int offset_delta() const {

     return Bytes::get_Java_u2(offset_delta_addr()) + 1;

   }

   void set_offset_delta(int offset_delta) {

     Bytes::put_Java_u2(offset_delta_addr(), offset_delta - 1);

   }

   void set_type(verification_type_info* vti) {

     verification_type_info* cur = types();

     cur->copy_from(vti);

   }

   int number_of_types() const { return 1; }

   verification_type_info* types() const {

     return verification_type_info::at(type_addr());

   }

   bool is_valid_offset(int offset) { return true; }

   bool verify_subtype(address start, address end) const {

     return type_addr() < end && types()->verify(start, end);

   }

 #ifdef ASSERT

   void print_on(outputStream* st) const {

     st->print("same_frame_1_stack_item_extended(%d,", offset_delta());

     types()->print_on(st);

     st->print(")");

   }

 #endif

 };

 class chop_frame : public stack_map_frame {

  private:

   address offset_delta_addr() const { return frame_type_addr() + sizeof(u1); }

   static int frame_type_to_chops(u1 frame_type) {

     int chop = 251 - frame_type;

     return chop;

   }

   static u1 chops_to_frame_type(int chop) {

     return 251 - chop;

   }

  public:

   static bool is_frame_type(u1 tag) {

     return frame_type_to_chops(tag) > 0 && frame_type_to_chops(tag) < 4;

   }

   static chop_frame* at(address addr) {

     assert(is_frame_type(*addr), "Wrong frame id");

     return (chop_frame*)addr;

   }

   static chop_frame* create_at(address addr, int offset_delta, int chops) {

     chop_frame* sm = (chop_frame*)addr;

     sm->set_chops(chops);

     sm->set_offset_delta(offset_delta);

     return sm;

   }

   static size_t calculate_size() {

     return sizeof(u1) + sizeof(u2);

   }

   size_t size() const { return calculate_size(); }

   int offset_delta() const {

     return Bytes::get_Java_u2(offset_delta_addr()) + 1;

   }

   void set_offset_delta(int offset_delta) {

     Bytes::put_Java_u2(offset_delta_addr(), offset_delta - 1);

   }

   int chops() const {

     int chops = frame_type_to_chops(frame_type());

     assert(chops > 0 && chops < 4, "Invalid number of chops in frame");

     return chops;

   }

   void set_chops(int chops) {

     assert(chops > 0 && chops <= 3, "Bad number of chops");

     set_frame_type(chops_to_frame_type(chops));

   }

   int number_of_types() const { return 0; }

   verification_type_info* types() const { return NULL; }

   bool is_valid_offset(int offset) { return true; }

   bool verify_subtype(address start, address end) const {

     return frame_type_addr() + size() <= end;

   }

 #ifdef ASSERT

   void print_on(outputStream* st) const {

     st->print("chop_frame(%d,%d)", offset_delta(), chops());

   }

 #endif

 };

 class append_frame : public stack_map_frame {

  private:

   address offset_delta_addr() const { return frame_type_addr() + sizeof(u1); }

   address types_addr() const { return offset_delta_addr() + sizeof(u2); }

   static int frame_type_to_appends(u1 frame_type) {

     int append = frame_type - 251;

     return append;

   }

   static u1 appends_to_frame_type(int appends) {

     assert(appends > 0 && appends < 4, "Invalid append amount");

     return 251 + appends;

   }

  public:

   static bool is_frame_type(u1 tag) {

     return frame_type_to_appends(tag) > 0 && frame_type_to_appends(tag) < 4;

   }

   static append_frame* at(address addr) {

     assert(is_frame_type(*addr), "Wrong frame id");

     return (append_frame*)addr;

   }

   static append_frame* create_at(

       address addr, int offset_delta, int appends,

       verification_type_info* types) {

     append_frame* sm = (append_frame*)addr;

     sm->set_appends(appends);

     sm->set_offset_delta(offset_delta);

     if (types != NULL) {

       verification_type_info* cur = sm->types();

       for (int i = 0; i < appends; ++i) {

         cur->copy_from(types);

         cur = cur->next();

         types = types->next();

       }

     }

     return sm;

   }

   static size_t calculate_size(int appends, verification_type_info* types) {

     size_t sz = sizeof(u1) + sizeof(u2);

     for (int i = 0; i < appends; ++i) {

       sz += types->size();

       types = types->next();

     }

     return sz;

   }

   static size_t max_size() {

     return sizeof(u1) + sizeof(u2) + 3 * verification_type_info::max_size();

   }

   size_t size() const { return calculate_size(number_of_types(), types()); }

   int offset_delta() const {

     return Bytes::get_Java_u2(offset_delta_addr()) + 1;

   }

   void set_offset_delta(int offset_delta) {

     Bytes::put_Java_u2(offset_delta_addr(), offset_delta - 1);

   }

   void set_appends(int appends) {

     assert(appends > 0 && appends < 4, "Bad number of appends");

     set_frame_type(appends_to_frame_type(appends));

   }

   int number_of_types() const {

     int appends = frame_type_to_appends(frame_type());

     assert(appends > 0 && appends < 4, "Invalid number of appends in frame");

     return appends;

   }

   verification_type_info* types() const {

     return verification_type_info::at(types_addr());

   }

   bool is_valid_offset(int offset) const { return true; }

   bool verify_subtype(address start, address end) const {

     verification_type_info* vti = types();

     if ((address)vti < end && vti->verify(start, end)) {

       int nof = number_of_types();

       vti = vti->next();

       if (nof < 2 || vti->verify(start, end)) {

         vti = vti->next();

         if (nof < 3 || vti->verify(start, end)) {

           return true;

         }

       }

     }

     return false;

   }

 #ifdef ASSERT

   void print_on(outputStream* st) const {

     st->print("append_frame(%d,", offset_delta());

     verification_type_info* vti = types();

     for (int i = 0; i < number_of_types(); ++i) {

       vti->print_on(st);

       if (i != number_of_types() - 1) {

         st->print(",");

       }

       vti = vti->next();

     }

     st->print(")");

   }

 #endif

 };

 class full_frame : public stack_map_frame {

  private:

   address offset_delta_addr() const { return frame_type_addr() + sizeof(u1); }

   address num_locals_addr() const { return offset_delta_addr() + sizeof(u2); }

   address locals_addr() const { return num_locals_addr() + sizeof(u2); }

   address stack_slots_addr(address end_of_locals) const {

       return end_of_locals; }

   address stack_addr(address end_of_locals) const {

       return stack_slots_addr(end_of_locals) + sizeof(u2); }

   enum { _frame_id = 255 };

  public:

   static bool is_frame_type(u1 tag) {

     return tag == _frame_id;

   }

   static full_frame* at(address addr) {

     assert(is_frame_type(*addr), "Wrong frame id");

     return (full_frame*)addr;

   }

   static full_frame* create_at(

       address addr, int offset_delta, int num_locals,

       verification_type_info* locals,

       int stack_slots, verification_type_info* stack) {

     full_frame* sm = (full_frame*)addr;

     sm->set_frame_type(_frame_id);

     sm->set_offset_delta(offset_delta);

     sm->set_num_locals(num_locals);

     if (locals != NULL) {

       verification_type_info* cur = sm->locals();

       for (int i = 0; i < num_locals; ++i) {

         cur->copy_from(locals);

         cur = cur->next();

         locals = locals->next();

       }

       address end_of_locals = (address)cur;

       sm->set_stack_slots(end_of_locals, stack_slots);

       cur = sm->stack(end_of_locals);

       for (int i = 0; i < stack_slots; ++i) {

         cur->copy_from(stack);

         cur = cur->next();

         stack = stack->next();

       }

     }

     return sm;

   }

   static size_t calculate_size(

       int num_locals, verification_type_info* locals,

       int stack_slots, verification_type_info* stack) {

     size_t sz = sizeof(u1) + sizeof(u2) + sizeof(u2) + sizeof(u2);

     verification_type_info* vti = locals;

     for (int i = 0; i < num_locals; ++i) {

       sz += vti->size();

       vti = vti->next();

     }

     vti = stack;

     for (int i = 0; i < stack_slots; ++i) {

       sz += vti->size();

       vti = vti->next();

     }

     return sz;

   }

   static size_t max_size(int locals, int stack) {

     return sizeof(u1) + 3 * sizeof(u2) +

         (locals + stack) * verification_type_info::max_size();

   }

   size_t size() const {

     address eol = end_of_locals();

     return calculate_size(num_locals(), locals(), stack_slots(eol), stack(eol));

   }

   int offset_delta() const {

     return Bytes::get_Java_u2(offset_delta_addr()) + 1;

   }

   int num_locals() const { return Bytes::get_Java_u2(num_locals_addr()); }

   verification_type_info* locals() const {

     return verification_type_info::at(locals_addr());

   }

   address end_of_locals() const {

     verification_type_info* vti = locals();

     for (int i = 0; i < num_locals(); ++i) {

       vti = vti->next();

     }

     return (address)vti;

   }

   int stack_slots(address end_of_locals) const {

     return Bytes::get_Java_u2(stack_slots_addr(end_of_locals));

   }

   verification_type_info* stack(address end_of_locals) const {

     return verification_type_info::at(stack_addr(end_of_locals));

   }

   void set_offset_delta(int offset_delta) {

     Bytes::put_Java_u2(offset_delta_addr(), offset_delta - 1);

   }

   void set_num_locals(int num_locals) {

     Bytes::put_Java_u2(num_locals_addr(), num_locals);

   }

   void set_stack_slots(address end_of_locals, int stack_slots) {

     Bytes::put_Java_u2(stack_slots_addr(end_of_locals), stack_slots);

   }

   // These return only the locals.  Extra processing is required for stack

   // types of full frames.

   int number_of_types() const { return num_locals(); }

   verification_type_info* types() const { return locals(); }

   bool is_valid_offset(int offset) { return true; }

   bool verify_subtype(address start, address end) const {

     verification_type_info* vti = types();

     if ((address)vti >= end) {

       return false;

     }

     int count = number_of_types();

     for (int i = 0; i < count; ++i) {

       if (!vti->verify(start, end)) {

         return false;

       }

       vti = vti->next();

     }

     address eol = (address)vti;

     if (eol + sizeof(u2) > end) {

       return false;

     }

     count = stack_slots(eol);

     vti = stack(eol);

     for (int i = 0; i < stack_slots(eol); ++i) {

       if (!vti->verify(start, end)) {

         return false;

       }

       vti = vti->next();

     }

     return true;

   }

 #ifdef ASSERT

   void print_on(outputStream* st) const {

     st->print("full_frame(%d,{", offset_delta());

     verification_type_info* vti = locals();

     for (int i = 0; i < num_locals(); ++i) {

       vti->print_on(st);

       if (i != num_locals() - 1) {

         st->print(",");

       }

       vti = vti->next();

     }

     st->print("},{");

     address end_of_locals = (address)vti;

     vti = stack(end_of_locals);

     int ss = stack_slots(end_of_locals);

     for (int i = 0; i < ss; ++i) {

       vti->print_on(st);

       if (i != ss - 1) {

         st->print(",");

       }

       vti = vti->next();

     }

     st->print("})");

   }

 #endif

 };

 #define VIRTUAL_DISPATCH(stack_frame_type, func_name, args) \

   stack_frame_type* item_##stack_frame_type = as_##stack_frame_type(); \

   if (item_##stack_frame_type != NULL) { \

     return item_##stack_frame_type->func_name args;  \

   }

 #define VOID_VIRTUAL_DISPATCH(stack_frame_type, func_name, args) \

   stack_frame_type* item_##stack_frame_type = as_##stack_frame_type(); \

   if (item_##stack_frame_type != NULL) { \

     item_##stack_frame_type->func_name args;  \

     return; \

   }

 size_t stack_map_frame::size() const {

   FOR_EACH_STACKMAP_FRAME_TYPE(VIRTUAL_DISPATCH, size, ());

   return 0;

 }

 int stack_map_frame::offset_delta() const {

   FOR_EACH_STACKMAP_FRAME_TYPE(VIRTUAL_DISPATCH, offset_delta, ());

   return 0;

 }

 void stack_map_frame::set_offset_delta(int offset_delta) {

   FOR_EACH_STACKMAP_FRAME_TYPE(

       VOID_VIRTUAL_DISPATCH, set_offset_delta, (offset_delta));

 }

 int stack_map_frame::number_of_types() const {

   FOR_EACH_STACKMAP_FRAME_TYPE(VIRTUAL_DISPATCH, number_of_types, ());

   return 0;

 }

 verification_type_info* stack_map_frame::types() const {

   FOR_EACH_STACKMAP_FRAME_TYPE(VIRTUAL_DISPATCH, types, ());

   return NULL;

 }

 bool stack_map_frame::is_valid_offset(int offset) const {

   FOR_EACH_STACKMAP_FRAME_TYPE(VIRTUAL_DISPATCH, is_valid_offset, (offset));

   return true;

 }

 bool stack_map_frame::verify(address start, address end) const {

   if (frame_type_addr() >= start && frame_type_addr() < end) {

     FOR_EACH_STACKMAP_FRAME_TYPE(

        VIRTUAL_DISPATCH, verify_subtype, (start, end));

   }

   return false;

 }

 #ifdef ASSERT

 void stack_map_frame::print_on(outputStream* st) const {

   FOR_EACH_STACKMAP_FRAME_TYPE(VOID_VIRTUAL_DISPATCH, print_on, (st));

 }

 #endif

 #undef VIRTUAL_DISPATCH

 #undef VOID_VIRTUAL_DISPATCH

 #define AS_SUBTYPE_DEF(stack_frame_type, arg1, arg2) \

 stack_frame_type* stack_map_frame::as_##stack_frame_type() const { \

   if (stack_frame_type::is_frame_type(frame_type())) { \

     return (stack_frame_type*)this; \

   } else { \

     return NULL; \

   } \

 }

 FOR_EACH_STACKMAP_FRAME_TYPE(AS_SUBTYPE_DEF, x, x)

 #undef AS_SUBTYPE_DEF

 class stack_map_table_attribute {

  private:

   address name_index_addr() const {

       return (address)this; }

   address attribute_length_addr() const {

       return name_index_addr() + sizeof(u2); }

   address number_of_entries_addr() const {

       return attribute_length_addr() + sizeof(u4); }

   address entries_addr() const {

       return number_of_entries_addr() + sizeof(u2); }

  protected:

   // No constructors  - should be 'private', but GCC issues a warning if it is

   stack_map_table_attribute() {}

   stack_map_table_attribute(const stack_map_table_attribute&) {}

  public:

   static stack_map_table_attribute* at(address addr) {

     return (stack_map_table_attribute*)addr;

   }

   u2 name_index() const {

        return Bytes::get_Java_u2(name_index_addr()); }

   u4 attribute_length() const {

       return Bytes::get_Java_u4(attribute_length_addr()); }

   u2 number_of_entries() const {

       return Bytes::get_Java_u2(number_of_entries_addr()); }

   stack_map_frame* entries() const {

     return stack_map_frame::at(entries_addr());

   }

   static size_t header_size() {

       return sizeof(u2) + sizeof(u4);

   }

   void set_name_index(u2 idx) {

     Bytes::put_Java_u2(name_index_addr(), idx);

   }

   void set_attribute_length(u4 len) {

     Bytes::put_Java_u4(attribute_length_addr(), len);

   }

   void set_number_of_entries(u2 num) {

     Bytes::put_Java_u2(number_of_entries_addr(), num);

   }

 };