jdk8-mips64-public/hotspot: comparison src/share/vm/classfile/stackMapFrame.cpp

--1:000000000000
+:f90c822e73f8
+/*
+* Copyright (c) 2003, 2014, 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::has_flag_match_exception(
+const StackMapFrame* target) const {
+// We allow flags of {UninitThis} to assign to {} if-and-only-if the
+// target frame does not depend upon the current type.
+// This is slightly too strict, as we need only enforce that the
+// slots that were initialized by the <init> (the things that were
+// UninitializedThis before initialize_object() converted them) are unused.
+// However we didn't save that information so we'll enforce this upon
+// anything that might have been initialized.  This is a rare situation
+// and javac never generates code that would end up here, but some profilers
+// (such as NetBeans) might, when adding exception handlers in <init>
+// methods to cover the invokespecial instruction.  See 7020118.
+assert(max_locals() == target->max_locals() &&
+stack_size() == target->stack_size(), "StackMap sizes must match");
+VerificationType top = VerificationType::top_type();
+VerificationType this_type = verifier()->current_type();
+if (!flag_this_uninit() || target->flags() != 0) {
+return false;
+}
+for (int i = 0; i < target->locals_size(); ++i) {
+if (locals()[i] == this_type && target->locals()[i] != top) {
+return false;
+}
+}
+for (int i = 0; i < target->stack_size(); ++i) {
+if (stack()[i] == this_type && target->stack()[i] != top) {
+return false;
+}
+}
+return true;
+}
+bool StackMapFrame::is_assignable_to(
+const StackMapFrame* target, bool is_exception_handler,
+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;
+}
+bool match_flags = (_flags | target->flags()) == target->flags();
+if (match_flags || is_exception_handler && has_flag_match_exception(target)) {
+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(" }");
+}

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

comparison: src/share/vm/classfile/stackMapFrame.cpp

src/share/vm/classfile/stackMapFrame.cpp