--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/classfile/stackMapFrame.cpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,360 @@
+/*
+ * Copyright (c) 2003, 2016, 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.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "classfile/stackMapFrame.hpp"
+#include "classfile/verifier.hpp"
+#include "memory/resourceArea.hpp"
+#include "oops/oop.inline.hpp"
+#include "oops/symbol.hpp"
+#include "runtime/handles.inline.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+StackMapFrame::StackMapFrame(u2 max_locals, u2 max_stack, ClassVerifier* v) :
+                      _offset(0), _locals_size(0), _stack_size(0),
+                      _stack_mark(0), _flags(0), _max_locals(max_locals),
+                      _max_stack(max_stack), _verifier(v) {
+  Thread* thr = v->thread();
+  _locals = NEW_RESOURCE_ARRAY_IN_THREAD(thr, VerificationType, max_locals);
+  _stack = NEW_RESOURCE_ARRAY_IN_THREAD(thr, VerificationType, max_stack);
+  int32_t i;
+  for(i = 0; i < max_locals; i++) {
+    _locals[i] = VerificationType::bogus_type();
+  }
+  for(i = 0; i < max_stack; i++) {
+    _stack[i] = VerificationType::bogus_type();
+  }
+}
+
+StackMapFrame* StackMapFrame::frame_in_exception_handler(u1 flags) {
+  Thread* thr = _verifier->thread();
+  VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD(thr, VerificationType, 1);
+  StackMapFrame* frame = new StackMapFrame(_offset, flags, _locals_size, 0, _max_locals, _max_stack, _locals, stack, _verifier);
+  return frame;
+}
+
+void StackMapFrame::initialize_object(
+    VerificationType old_object, VerificationType new_object) {
+  int32_t i;
+  for (i = 0; i < _max_locals; i++) {
+    if (_locals[i].equals(old_object)) {
+      _locals[i] = new_object;
+    }
+  }
+  for (i = 0; i < _stack_size; i++) {
+    if (_stack[i].equals(old_object)) {
+      _stack[i] = new_object;
+    }
+  }
+  if (old_object == VerificationType::uninitialized_this_type()) {
+    // "this" has been initialized - reset flags
+    _flags = 0;
+  }
+}
+
+VerificationType StackMapFrame::set_locals_from_arg(
+    const methodHandle& m, VerificationType thisKlass, TRAPS) {
+  SignatureStream ss(m->signature());
+  int init_local_num = 0;
+  if (!m->is_static()) {
+    init_local_num++;
+    // add one extra argument for instance method
+    if (m->name() == vmSymbols::object_initializer_name() &&
+       thisKlass.name() != vmSymbols::java_lang_Object()) {
+      _locals[0] = VerificationType::uninitialized_this_type();
+      _flags |= FLAG_THIS_UNINIT;
+    } else {
+      _locals[0] = thisKlass;
+    }
+  }
+
+  // local num may be greater than size of parameters because long/double occupies two slots
+  while(!ss.at_return_type()) {
+    init_local_num += _verifier->change_sig_to_verificationType(
+      &ss, &_locals[init_local_num],
+      CHECK_VERIFY_(verifier(), VerificationType::bogus_type()));
+    ss.next();
+  }
+  _locals_size = init_local_num;
+
+  switch (ss.type()) {
+    case T_OBJECT:
+    case T_ARRAY:
+    {
+      Symbol* sig = ss.as_symbol(CHECK_(VerificationType::bogus_type()));
+      // Create another symbol to save as signature stream unreferences
+      // this symbol.
+      Symbol* sig_copy =
+        verifier()->create_temporary_symbol(sig, 0, sig->utf8_length(),
+                                 CHECK_(VerificationType::bogus_type()));
+      assert(sig_copy == sig, "symbols don't match");
+      return VerificationType::reference_type(sig_copy);
+    }
+    case T_INT:     return VerificationType::integer_type();
+    case T_BYTE:    return VerificationType::byte_type();
+    case T_CHAR:    return VerificationType::char_type();
+    case T_SHORT:   return VerificationType::short_type();
+    case T_BOOLEAN: return VerificationType::boolean_type();
+    case T_FLOAT:   return VerificationType::float_type();
+    case T_DOUBLE:  return VerificationType::double_type();
+    case T_LONG:    return VerificationType::long_type();
+    case T_VOID:    return VerificationType::bogus_type();
+    default:
+      ShouldNotReachHere();
+  }
+  return VerificationType::bogus_type();
+}
+
+void StackMapFrame::copy_locals(const StackMapFrame* src) {
+  int32_t len = src->locals_size() < _locals_size ?
+    src->locals_size() : _locals_size;
+  for (int32_t i = 0; i < len; i++) {
+    _locals[i] = src->locals()[i];
+  }
+}
+
+void StackMapFrame::copy_stack(const StackMapFrame* src) {
+  int32_t len = src->stack_size() < _stack_size ?
+    src->stack_size() : _stack_size;
+  for (int32_t i = 0; i < len; i++) {
+    _stack[i] = src->stack()[i];
+  }
+}
+
+// Returns the location of the first mismatch, or 'len' if there are no
+// mismatches
+int StackMapFrame::is_assignable_to(
+    VerificationType* from, VerificationType* to, int32_t len, TRAPS) const {
+  int32_t i = 0;
+  for (i = 0; i < len; i++) {
+    if (!to[i].is_assignable_from(from[i], verifier(), false, THREAD)) {
+      break;
+    }
+  }
+  return i;
+}
+
+bool StackMapFrame::is_assignable_to(
+    const StackMapFrame* target, ErrorContext* ctx, TRAPS) const {
+  if (_max_locals != target->max_locals()) {
+    *ctx = ErrorContext::locals_size_mismatch(
+        _offset, (StackMapFrame*)this, (StackMapFrame*)target);
+    return false;
+  }
+  if (_stack_size != target->stack_size()) {
+    *ctx = ErrorContext::stack_size_mismatch(
+        _offset, (StackMapFrame*)this, (StackMapFrame*)target);
+    return false;
+  }
+  // Only need to compare type elements up to target->locals() or target->stack().
+  // The remaining type elements in this state can be ignored because they are
+  // assignable to bogus type.
+  int mismatch_loc;
+  mismatch_loc = is_assignable_to(
+    _locals, target->locals(), target->locals_size(), THREAD);
+  if (mismatch_loc != target->locals_size()) {
+    *ctx = ErrorContext::bad_type(target->offset(),
+        TypeOrigin::local(mismatch_loc, (StackMapFrame*)this),
+        TypeOrigin::sm_local(mismatch_loc, (StackMapFrame*)target));
+    return false;
+  }
+  mismatch_loc = is_assignable_to(_stack, target->stack(), _stack_size, THREAD);
+  if (mismatch_loc != _stack_size) {
+    *ctx = ErrorContext::bad_type(target->offset(),
+        TypeOrigin::stack(mismatch_loc, (StackMapFrame*)this),
+        TypeOrigin::sm_stack(mismatch_loc, (StackMapFrame*)target));
+    return false;
+  }
+
+  if ((_flags | target->flags()) == target->flags()) {
+    return true;
+  } else {
+    *ctx = ErrorContext::bad_flags(target->offset(),
+        (StackMapFrame*)this, (StackMapFrame*)target);
+    return false;
+  }
+}
+
+VerificationType StackMapFrame::pop_stack_ex(VerificationType type, TRAPS) {
+  if (_stack_size <= 0) {
+    verifier()->verify_error(
+        ErrorContext::stack_underflow(_offset, this),
+        "Operand stack underflow");
+    return VerificationType::bogus_type();
+  }
+  VerificationType top = _stack[--_stack_size];
+  bool subtype = type.is_assignable_from(
+    top, verifier(), false, CHECK_(VerificationType::bogus_type()));
+  if (!subtype) {
+    verifier()->verify_error(
+        ErrorContext::bad_type(_offset, stack_top_ctx(),
+            TypeOrigin::implicit(type)),
+        "Bad type on operand stack");
+    return VerificationType::bogus_type();
+  }
+  return top;
+}
+
+VerificationType StackMapFrame::get_local(
+    int32_t index, VerificationType type, TRAPS) {
+  if (index >= _max_locals) {
+    verifier()->verify_error(
+        ErrorContext::bad_local_index(_offset, index),
+        "Local variable table overflow");
+    return VerificationType::bogus_type();
+  }
+  bool subtype = type.is_assignable_from(_locals[index],
+    verifier(), false, CHECK_(VerificationType::bogus_type()));
+  if (!subtype) {
+    verifier()->verify_error(
+        ErrorContext::bad_type(_offset,
+          TypeOrigin::local(index, this),
+          TypeOrigin::implicit(type)),
+        "Bad local variable type");
+    return VerificationType::bogus_type();
+  }
+  if(index >= _locals_size) { _locals_size = index + 1; }
+  return _locals[index];
+}
+
+void StackMapFrame::get_local_2(
+    int32_t index, VerificationType type1, VerificationType type2, TRAPS) {
+  assert(type1.is_long() || type1.is_double(), "must be long/double");
+  assert(type2.is_long2() || type2.is_double2(), "must be long/double_2");
+  if (index >= _locals_size - 1) {
+    verifier()->verify_error(
+        ErrorContext::bad_local_index(_offset, index),
+        "get long/double overflows locals");
+    return;
+  }
+  bool subtype = type1.is_assignable_from(_locals[index], verifier(), false, CHECK);
+  if (!subtype) {
+    verifier()->verify_error(
+        ErrorContext::bad_type(_offset,
+            TypeOrigin::local(index, this), TypeOrigin::implicit(type1)),
+        "Bad local variable type");
+  } else {
+    subtype = type2.is_assignable_from(_locals[index + 1], verifier(), false, CHECK);
+    if (!subtype) {
+      /* Unreachable? All local store routines convert a split long or double
+       * into a TOP during the store.  So we should never end up seeing an
+       * orphaned half.  */
+      verifier()->verify_error(
+          ErrorContext::bad_type(_offset,
+              TypeOrigin::local(index + 1, this), TypeOrigin::implicit(type2)),
+          "Bad local variable type");
+    }
+  }
+}
+
+void StackMapFrame::set_local(int32_t index, VerificationType type, TRAPS) {
+  assert(!type.is_check(), "Must be a real type");
+  if (index >= _max_locals) {
+    verifier()->verify_error(
+        ErrorContext::bad_local_index(_offset, index),
+        "Local variable table overflow");
+    return;
+  }
+  // If type at index is double or long, set the next location to be unusable
+  if (_locals[index].is_double() || _locals[index].is_long()) {
+    assert((index + 1) < _locals_size, "Local variable table overflow");
+    _locals[index + 1] = VerificationType::bogus_type();
+  }
+  // If type at index is double_2 or long_2, set the previous location to be unusable
+  if (_locals[index].is_double2() || _locals[index].is_long2()) {
+    assert(index >= 1, "Local variable table underflow");
+    _locals[index - 1] = VerificationType::bogus_type();
+  }
+  _locals[index] = type;
+  if (index >= _locals_size) {
+#ifdef ASSERT
+    for (int i=_locals_size; i<index; i++) {
+      assert(_locals[i] == VerificationType::bogus_type(),
+             "holes must be bogus type");
+    }
+#endif
+    _locals_size = index + 1;
+  }
+}
+
+void StackMapFrame::set_local_2(
+    int32_t index, VerificationType type1, VerificationType type2, TRAPS) {
+  assert(type1.is_long() || type1.is_double(), "must be long/double");
+  assert(type2.is_long2() || type2.is_double2(), "must be long/double_2");
+  if (index >= _max_locals - 1) {
+    verifier()->verify_error(
+        ErrorContext::bad_local_index(_offset, index),
+        "Local variable table overflow");
+    return;
+  }
+  // If type at index+1 is double or long, set the next location to be unusable
+  if (_locals[index+1].is_double() || _locals[index+1].is_long()) {
+    assert((index + 2) < _locals_size, "Local variable table overflow");
+    _locals[index + 2] = VerificationType::bogus_type();
+  }
+  // If type at index is double_2 or long_2, set the previous location to be unusable
+  if (_locals[index].is_double2() || _locals[index].is_long2()) {
+    assert(index >= 1, "Local variable table underflow");
+    _locals[index - 1] = VerificationType::bogus_type();
+  }
+  _locals[index] = type1;
+  _locals[index+1] = type2;
+  if (index >= _locals_size - 1) {
+#ifdef ASSERT
+    for (int i=_locals_size; i<index; i++) {
+      assert(_locals[i] == VerificationType::bogus_type(),
+             "holes must be bogus type");
+    }
+#endif
+    _locals_size = index + 2;
+  }
+}
+
+TypeOrigin StackMapFrame::stack_top_ctx() {
+  return TypeOrigin::stack(_stack_size, this);
+}
+
+void StackMapFrame::print_on(outputStream* str) const {
+  str->indent().print_cr("bci: @%d", _offset);
+  str->indent().print_cr("flags: {%s }",
+      flag_this_uninit() ? " flagThisUninit" : "");
+  str->indent().print("locals: {");
+  for (int32_t i = 0; i < _locals_size; ++i) {
+    str->print(" ");
+    _locals[i].print_on(str);
+    if (i != _locals_size - 1) {
+      str->print(",");
+    }
+  }
+  str->print_cr(" }");
+  str->indent().print("stack: {");
+  for (int32_t j = 0; j < _stack_size; ++j) {
+    str->print(" ");
+    _stack[j].print_on(str);
+    if (j != _stack_size - 1) {
+      str->print(",");
+    }
+  }
+  str->print_cr(" }");
+}