jdk8-mips64-public/hotspot: src/share/vm/classfile/stackMapFrame.hpp@710a3c8b516e (annotated)

src/share/vm/classfile/stackMapFrame.hpp@710a3c8b516e (annotated)

src/share/vm/classfile/stackMapFrame.hpp

Tue, 08 Aug 2017 15:57:29 +0800

author: aoqi
date: Tue, 08 Aug 2017 15:57:29 +0800
changeset 6876: 710a3c8b516e
parent 6872: c77d5db18942
parent 0: f90c822e73f8
child 7535: 7ae4e26cb1e0
permissions: -rw-r--r--

merge

 /*
  * 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.
  *
  */
 #ifndef SHARE_VM_CLASSFILE_STACKMAPFRAME_HPP
 #define SHARE_VM_CLASSFILE_STACKMAPFRAME_HPP
 #include "classfile/verificationType.hpp"
 #include "classfile/verifier.hpp"
 #include "oops/method.hpp"
 #include "runtime/handles.hpp"
 #include "runtime/signature.hpp"
 #include "utilities/exceptions.hpp"
 // A StackMapFrame represents one frame in the stack map attribute.
 class TypeContext;
 enum {
   FLAG_THIS_UNINIT = 0x01
 };
 class StackMapFrame : public ResourceObj {
  private:
   int32_t _offset;
   // See comment in StackMapTable about _frame_count about why these
   // fields are int32_t instead of u2.
   int32_t _locals_size;  // number of valid type elements in _locals
   int32_t _stack_size;   // number of valid type elements in _stack
   int32_t _stack_mark;   // Records the size of the stack prior to an
                          // instruction modification, to allow rewinding
                          // when/if an error occurs.
   int32_t _max_locals;
   int32_t _max_stack;
   u1 _flags;
   VerificationType* _locals; // local variable type array
   VerificationType* _stack;  // operand stack type array
   ClassVerifier* _verifier;  // the verifier verifying this method
   StackMapFrame(const StackMapFrame& cp) :
       _offset(cp._offset), _locals_size(cp._locals_size),
       _stack_size(cp._stack_size), _stack_mark(cp._stack_mark),
       _max_locals(cp._max_locals), _max_stack(cp._max_stack),
       _flags(cp._flags) {
     _locals = NEW_RESOURCE_ARRAY(VerificationType, _max_locals);
     for (int i = 0; i < _max_locals; ++i) {
       if (i < _locals_size) {
         _locals[i] = cp._locals[i];
       } else {
         _locals[i] = VerificationType::bogus_type();
       }
     }
     int ss = MAX2(_stack_size, _stack_mark);
     _stack = NEW_RESOURCE_ARRAY(VerificationType, _max_stack);
     for (int i = 0; i < _max_stack; ++i) {
       if (i < ss) {
         _stack[i] = cp._stack[i];
       } else {
         _stack[i] = VerificationType::bogus_type();
       }
     }
     _verifier = NULL;
   }
  public:
   // constructors
   // This constructor is used by the type checker to allocate frames
   // in type state, which have _max_locals and _max_stack array elements
   // in _locals and _stack.
   StackMapFrame(u2 max_locals, u2 max_stack, ClassVerifier* verifier);
   // This constructor is used to initialize stackmap frames in stackmap table,
   // which have _locals_size and _stack_size array elements in _locals and _stack.
   StackMapFrame(int32_t offset,
                 u1 flags,
                 u2 locals_size,
                 u2 stack_size,
                 u2 max_locals,
                 u2 max_stack,
                 VerificationType* locals,
                 VerificationType* stack,
                 ClassVerifier* v) : _offset(offset), _flags(flags),
                                     _locals_size(locals_size),
                                     _stack_size(stack_size),
                                     _stack_mark(-1),
                                     _max_locals(max_locals),
                                     _max_stack(max_stack),
                                     _locals(locals), _stack(stack),
                                     _verifier(v) { }
   static StackMapFrame* copy(StackMapFrame* smf) {
     return new StackMapFrame(*smf);
   }
   inline void set_offset(int32_t offset)      { _offset = offset; }
   inline void set_verifier(ClassVerifier* v)  { _verifier = v; }
   inline void set_flags(u1 flags)             { _flags = flags; }
   inline void set_locals_size(u2 locals_size) { _locals_size = locals_size; }
   inline void set_stack_size(u2 stack_size)   { _stack_size = _stack_mark = stack_size; }
   inline void clear_stack()                   { _stack_size = 0; }
   inline int32_t offset()   const             { return _offset; }
   inline ClassVerifier* verifier() const      { return _verifier; }
   inline u1 flags() const                     { return _flags; }
   inline int32_t locals_size() const          { return _locals_size; }
   inline VerificationType* locals() const     { return _locals; }
   inline int32_t stack_size() const           { return _stack_size; }
   inline VerificationType* stack() const      { return _stack; }
   inline int32_t max_locals() const           { return _max_locals; }
   inline int32_t max_stack() const            { return _max_stack; }
   inline bool flag_this_uninit() const        { return _flags & FLAG_THIS_UNINIT; }
   // Set locals and stack types to bogus
   inline void reset() {
     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();
     }
   }
   // Return a StackMapFrame with the same local variable array and empty stack.
   // Stack array is allocate with unused one element.
   StackMapFrame* frame_in_exception_handler(u1 flags);
   // Set local variable type array based on m's signature.
   VerificationType set_locals_from_arg(
     const methodHandle m, VerificationType thisKlass, TRAPS);
   // Search local variable type array and stack type array.
   // Set every element with type of old_object to new_object.
   void initialize_object(
     VerificationType old_object, VerificationType new_object);
   // Copy local variable type array in src into this local variable type array.
   void copy_locals(const StackMapFrame* src);
   // Copy stack type array in src into this stack type array.
   void copy_stack(const StackMapFrame* src);
   // Return true if this stack map frame is assignable to target.
   bool is_assignable_to(
       const StackMapFrame* target, bool is_exception_handler,
       ErrorContext* ctx, TRAPS) const;
   inline void set_mark() {
 #ifdef ASSERT
     // Put bogus type to indicate it's no longer valid.
     if (_stack_mark != -1) {
       for (int i = _stack_mark - 1; i >= _stack_size; --i) {
         _stack[i] = VerificationType::bogus_type();
       }
     }
 #endif // def ASSERT
     _stack_mark = _stack_size;
   }
   // Used when an error occurs and we want to reset the stack to the state
   // it was before operands were popped off.
   void restore() {
     if (_stack_mark != -1) {
       _stack_size = _stack_mark;
     }
   }
   // Push type into stack type array.
   inline void push_stack(VerificationType type, TRAPS) {
     assert(!type.is_check(), "Must be a real type");
     if (_stack_size >= _max_stack) {
       verifier()->verify_error(
           ErrorContext::stack_overflow(_offset, this),
           "Operand stack overflow");
       return;
     }
     _stack[_stack_size++] = type;
   }
   inline void push_stack_2(
       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 (_stack_size >= _max_stack - 1) {
       verifier()->verify_error(
           ErrorContext::stack_overflow(_offset, this),
           "Operand stack overflow");
       return;
     }
     _stack[_stack_size++] = type1;
     _stack[_stack_size++] = type2;
   }
   // Pop and return the top type on stack without verifying.
   inline VerificationType pop_stack(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];
     return top;
   }
   // Pop and return the top type on stack type array after verifying it
   // is assignable to type.
   inline VerificationType pop_stack(VerificationType type, TRAPS) {
     if (_stack_size != 0) {
       VerificationType top = _stack[_stack_size - 1];
       bool subtype = type.is_assignable_from(
         top, verifier(), false, CHECK_(VerificationType::bogus_type()));
       if (subtype) {
         --_stack_size;
         return top;
       }
     }
     return pop_stack_ex(type, THREAD);
   }
   inline void pop_stack_2(
       VerificationType type1, VerificationType type2, TRAPS) {
     assert(type1.is_long2() || type1.is_double2(), "must be long/double");
     assert(type2.is_long() || type2.is_double(), "must be long/double_2");
     if (_stack_size >= 2) {
       VerificationType top1 = _stack[_stack_size - 1];
       bool subtype1 = type1.is_assignable_from(top1, verifier(), false, CHECK);
       VerificationType top2 = _stack[_stack_size - 2];
       bool subtype2 = type2.is_assignable_from(top2, verifier(), false, CHECK);
       if (subtype1 && subtype2) {
         _stack_size -= 2;
         return;
       }
     }
     pop_stack_ex(type1, THREAD);
     pop_stack_ex(type2, THREAD);
   }
   VerificationType local_at(int index) {
     return _locals[index];
   }
   VerificationType stack_at(int index) {
     return _stack[index];
   }
   // Uncommon case that throws exceptions.
   VerificationType pop_stack_ex(VerificationType type, TRAPS);
   // Return the type at index in local variable array after verifying
   // it is assignable to type.
   VerificationType get_local(int32_t index, VerificationType type, TRAPS);
   // For long/double.
   void get_local_2(
     int32_t index, VerificationType type1, VerificationType type2, TRAPS);
   // Set element at index in local variable array to type.
   void set_local(int32_t index, VerificationType type, TRAPS);
   // For long/double.
   void set_local_2(
     int32_t index, VerificationType type1, VerificationType type2, TRAPS);
   // Private auxiliary method used only in is_assignable_to(StackMapFrame).
   // Returns true if src is assignable to target.
   int is_assignable_to(
     VerificationType* src, VerificationType* target, int32_t len, TRAPS) const;
   bool has_flag_match_exception(const StackMapFrame* target) const;
   TypeOrigin stack_top_ctx();
   void print_on(outputStream* str) const;
 };
 #endif // SHARE_VM_CLASSFILE_STACKMAPFRAME_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/classfile/stackMapFrame.hpp@710a3c8b516e (annotated)

src/share/vm/classfile/stackMapFrame.hpp