--- /dev/null	2010-06-11 08:59:45.055002317 +0100
+++ new/hotspot/src/share/vm/shark/sharkBlock.hpp	2010-06-11 14:57:39.000000000 +0100
@@ -0,0 +1,281 @@
+/*
+ * Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved.
+ * Copyright 2008, 2009 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.
+ *
+ */
+
+class SharkState;
+
+class SharkBlock : public SharkTargetInvariants {
+ protected:
+  SharkBlock(const SharkTargetInvariants* parent)
+    : SharkTargetInvariants(parent),
+      _iter(target()),
+      _current_state(NULL) {}
+
+  SharkBlock(const SharkCompileInvariants* parent, ciMethod* target)
+    : SharkTargetInvariants(parent, target),
+      _iter(target),
+      _current_state(NULL) {}
+
+ private:
+  ciBytecodeStream _iter;
+  SharkState*      _current_state;
+
+ public:
+  ciBytecodeStream* iter() {
+    return &_iter;
+  }
+  Bytecodes::Code bc() {
+    return iter()->cur_bc();
+  }
+  int bci() {
+    return iter()->cur_bci();
+  }
+
+  // Entry state
+ protected:
+  virtual SharkState* entry_state();
+
+  // Current state
+ private:
+  SharkState* initial_current_state();
+
+ public:
+  SharkState* current_state() {
+    if (_current_state == NULL)
+      set_current_state(initial_current_state());
+    return _current_state;
+  }
+
+ protected:
+  void set_current_state(SharkState* current_state) {
+    _current_state = current_state;
+  }
+
+  // Local variables
+ protected:
+  SharkValue* local(int index) {
+    SharkValue *value = current_state()->local(index);
+    assert(value != NULL, "shouldn't be");
+    assert(value->is_one_word() ||
+           (index + 1 < max_locals() &&
+            current_state()->local(index + 1) == NULL), "should be");
+    return value;
+  }
+  void set_local(int index, SharkValue* value) {
+    assert(value != NULL, "shouldn't be");
+    current_state()->set_local(index, value);
+    if (value->is_two_word())
+      current_state()->set_local(index + 1, NULL);
+  }
+
+  // Expression stack (raw)
+ protected:
+  void xpush(SharkValue* value) {
+    current_state()->push(value);
+  }
+  SharkValue* xpop() {
+    return current_state()->pop();
+  }
+  SharkValue* xstack(int slot) {
+    SharkValue *value = current_state()->stack(slot);
+    assert(value != NULL, "shouldn't be");
+    assert(value->is_one_word() ||
+           (slot > 0 &&
+            current_state()->stack(slot - 1) == NULL), "should be");
+    return value;
+  }
+  int xstack_depth() {
+    return current_state()->stack_depth();
+  }
+
+  // Expression stack (cooked)
+ protected:
+  void push(SharkValue* value) {
+    assert(value != NULL, "shouldn't be");
+    xpush(value);
+    if (value->is_two_word())
+      xpush(NULL);
+  }
+  SharkValue* pop() {
+    int size = current_state()->stack(0) == NULL ? 2 : 1;
+    if (size == 2)
+      xpop();
+    SharkValue *value = xpop();
+    assert(value && value->size() == size, "should be");
+    return value;
+  }
+  SharkValue* pop_result(BasicType type) {
+    SharkValue *result = pop();
+
+#ifdef ASSERT
+    switch (result->basic_type()) {
+    case T_BOOLEAN:
+    case T_BYTE:
+    case T_CHAR:
+    case T_SHORT:
+      assert(type == T_INT, "type mismatch");
+      break;
+
+    case T_ARRAY:
+      assert(type == T_OBJECT, "type mismatch");
+      break;
+
+    default:
+      assert(result->basic_type() == type, "type mismatch");
+    }
+#endif // ASSERT
+
+    return result;
+  }
+
+  // Code generation
+ public:
+  virtual void emit_IR();
+
+ protected:
+  void parse_bytecode(int start, int limit);
+
+  // Helpers
+ protected:
+  virtual void do_zero_check(SharkValue* value);
+
+  // Zero checking
+ protected:
+  void check_null(SharkValue* object) {
+    zero_check(object);
+  }
+  void check_divide_by_zero(SharkValue* value) {
+    zero_check(value);
+  }
+ private:
+  void zero_check(SharkValue* value) {
+    if (!value->zero_checked())
+      do_zero_check(value);
+  }
+
+  // Safepoints
+ protected:
+  virtual void maybe_add_backedge_safepoint();
+
+  // Traps
+ protected:
+  virtual bool has_trap();
+  virtual int  trap_request();
+  virtual int  trap_bci();
+  virtual void do_trap(int trap_request);
+
+  // arraylength
+ protected:
+  virtual void do_arraylength();
+
+  // *aload and *astore
+ protected:
+  virtual void do_aload(BasicType basic_type);
+  virtual void do_astore(BasicType basic_type);
+
+  // *div and *rem
+ private:
+  void do_idiv() {
+    do_div_or_rem(false, false);
+  }
+  void do_irem() {
+    do_div_or_rem(false, true);
+  }
+  void do_ldiv() {
+    do_div_or_rem(true, false);
+  }
+  void do_lrem() {
+    do_div_or_rem(true, true);
+  }
+  void do_div_or_rem(bool is_long, bool is_rem);
+
+  // get* and put*
+ private:
+  void do_getstatic() {
+    do_field_access(true, false);
+  }
+  void do_getfield() {
+    do_field_access(true, true);
+  }
+  void do_putstatic() {
+    do_field_access(false, false);
+  }
+  void do_putfield() {
+    do_field_access(false, true);
+  }
+  void do_field_access(bool is_get, bool is_field);
+
+  // lcmp and [fd]cmp[lg]
+ private:
+  void do_lcmp();
+  void do_fcmp(bool is_double, bool unordered_is_greater);
+
+  // *return and athrow
+ protected:
+  virtual void do_return(BasicType type);
+  virtual void do_athrow();
+
+  // goto*
+ protected:
+  virtual void do_goto();
+
+  // jsr* and ret
+ protected:
+  virtual void do_jsr();
+  virtual void do_ret();
+
+  // if*
+ protected:
+  virtual void do_if(llvm::ICmpInst::Predicate p, SharkValue* b, SharkValue* a);
+
+  // *switch
+ protected:
+  int switch_default_dest();
+  int switch_table_length();
+  int switch_key(int i);
+  int switch_dest(int i);
+
+  virtual void do_switch();
+
+  // invoke*
+ protected:
+  virtual void do_call();
+
+  // checkcast and instanceof
+ protected:
+  virtual void do_instance_check();
+  virtual bool maybe_do_instanceof_if();
+
+  // new and *newarray
+ protected:
+  virtual void do_new();
+  virtual void do_newarray();
+  virtual void do_anewarray();
+  virtual void do_multianewarray();
+
+  // monitorenter and monitorexit
+ protected:
+  virtual void do_monitorenter();
+  virtual void do_monitorexit();
+};