/*
* Copyright 1997-2002 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
// Base class for different kinds of abstractions working
// relative to an objects 'this' pointer.
class ThisRelativeObj VALUE_OBJ_CLASS_SPEC {
private:
int sign_extend (int x, int size) const { const int s = (BytesPerInt - size)*BitsPerByte; return (x << s) >> s; }
public:
// Address computation
address addr_at (int offset) const { return (address)this + offset; }
address aligned_addr_at (int offset) const { return (address)round_to((intptr_t)addr_at(offset), jintSize); }
int aligned_offset (int offset) const { return aligned_addr_at(offset) - addr_at(0); }
// Java unsigned accessors (using Java spec byte ordering)
int java_byte_at (int offset) const { return *(jubyte*)addr_at(offset); }
int java_hwrd_at (int offset) const { return java_byte_at(offset) << (1 * BitsPerByte) | java_byte_at(offset + 1); }
int java_word_at (int offset) const { return java_hwrd_at(offset) << (2 * BitsPerByte) | java_hwrd_at(offset + 2); }
// Java signed accessors (using Java spec byte ordering)
int java_signed_byte_at(int offset) const { return sign_extend(java_byte_at(offset), 1); }
int java_signed_hwrd_at(int offset) const { return sign_extend(java_hwrd_at(offset), 2); }
int java_signed_word_at(int offset) const { return java_word_at(offset) ; }
// Fast accessors (using the machine's natural byte ordering)
int fast_byte_at (int offset) const { return *(jubyte *)addr_at(offset); }
int fast_hwrd_at (int offset) const { return *(jushort*)addr_at(offset); }
int fast_word_at (int offset) const { return *(juint *)addr_at(offset); }
// Fast signed accessors (using the machine's natural byte ordering)
int fast_signed_byte_at(int offset) const { return *(jbyte *)addr_at(offset); }
int fast_signed_hwrd_at(int offset) const { return *(jshort*)addr_at(offset); }
int fast_signed_word_at(int offset) const { return *(jint *)addr_at(offset); }
// Fast manipulators (using the machine's natural byte ordering)
void set_fast_byte_at (int offset, int x) const { *(jbyte *)addr_at(offset) = (jbyte )x; }
void set_fast_hwrd_at (int offset, int x) const { *(jshort*)addr_at(offset) = (jshort)x; }
void set_fast_word_at (int offset, int x) const { *(jint *)addr_at(offset) = (jint )x; }
};
// The base class for different kinds of bytecode abstractions.
// Provides the primitive operations to manipulate code relative
// to an objects 'this' pointer.
//
// Note: Even though it seems that the fast_index & set_fast_index
// functions are machine specific, they're not. They only use
// the natural way to store a 16bit index on a given machine,
// independent of the particular byte ordering. Since all other
// places in the system that refer to these indices use the
// same method (the natural byte ordering on the platform)
// this will always work and be machine-independent).
class Bytecode: public ThisRelativeObj {
protected:
u_char byte_at(int offset) const { return *addr_at(offset); }
bool check_must_rewrite() const;
public:
// Attributes
address bcp() const { return addr_at(0); }
address next_bcp() const { return addr_at(0) + Bytecodes::length_at(bcp()); }
Bytecodes::Code code() const { return Bytecodes::code_at(addr_at(0)); }
Bytecodes::Code java_code() const { return Bytecodes::java_code(code()); }
bool must_rewrite() const { return Bytecodes::can_rewrite(code()) && check_must_rewrite(); }
bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); }
int one_byte_index() const { return byte_at(1); }
int two_byte_index() const { return (byte_at(1) << 8) + byte_at(2); }
int offset() const { return (two_byte_index() << 16) >> 16; }
address destination() const { return bcp() + offset(); }
int fast_index() const { return Bytes::get_native_u2(addr_at(1)); }
// Attribute modification
void set_code(Bytecodes::Code code);
void set_fast_index(int i);
// Creation
inline friend Bytecode* Bytecode_at(address bcp);
};
inline Bytecode* Bytecode_at(address bcp) {
return (Bytecode*)bcp;
}
// Abstractions for lookupswitch bytecode
class LookupswitchPair: ThisRelativeObj {
private:
int _match;
int _offset;
public:
int match() const { return java_signed_word_at(0 * jintSize); }
int offset() const { return java_signed_word_at(1 * jintSize); }
};
class Bytecode_lookupswitch: public Bytecode {
public:
void verify() const PRODUCT_RETURN;
// Attributes
int default_offset() const { return java_signed_word_at(aligned_offset(1 + 0*jintSize)); }
int number_of_pairs() const { return java_signed_word_at(aligned_offset(1 + 1*jintSize)); }
LookupswitchPair* pair_at(int i) const { assert(0 <= i && i < number_of_pairs(), "pair index out of bounds");
return (LookupswitchPair*)aligned_addr_at(1 + (1 + i)*2*jintSize); }
// Creation
inline friend Bytecode_lookupswitch* Bytecode_lookupswitch_at(address bcp);
};
inline Bytecode_lookupswitch* Bytecode_lookupswitch_at(address bcp) {
Bytecode_lookupswitch* b = (Bytecode_lookupswitch*)bcp;
debug_only(b->verify());
return b;
}
class Bytecode_tableswitch: public Bytecode {
public:
void verify() const PRODUCT_RETURN;
// Attributes
int default_offset() const { return java_signed_word_at(aligned_offset(1 + 0*jintSize)); }
int low_key() const { return java_signed_word_at(aligned_offset(1 + 1*jintSize)); }
int high_key() const { return java_signed_word_at(aligned_offset(1 + 2*jintSize)); }
int dest_offset_at(int i) const;
int length() { return high_key()-low_key()+1; }
// Creation
inline friend Bytecode_tableswitch* Bytecode_tableswitch_at(address bcp);
};
inline Bytecode_tableswitch* Bytecode_tableswitch_at(address bcp) {
Bytecode_tableswitch* b = (Bytecode_tableswitch*)bcp;
debug_only(b->verify());
return b;
}
// Abstraction for invoke_{virtual, static, interface, special}
class Bytecode_invoke: public ResourceObj {
protected:
methodHandle _method; // method containing the bytecode
int _bci; // position of the bytecode
Bytecode_invoke(methodHandle method, int bci) : _method(method), _bci(bci) {}
public:
void verify() const;
// Attributes
methodHandle method() const { return _method; }
int bci() const { return _bci; }
address bcp() const { return _method->bcp_from(bci()); }
int index() const; // the constant pool index for the invoke
symbolOop name() const; // returns the name of the invoked method
symbolOop signature() const; // returns the signature of the invoked method
BasicType result_type(Thread *thread) const; // returns the result type of the invoke
Bytecodes::Code code() const { return Bytecodes::code_at(bcp(), _method()); }
Bytecodes::Code adjusted_invoke_code() const { return Bytecodes::java_code(code()); }
methodHandle static_target(TRAPS); // "specified" method (from constant pool)
// Testers
bool is_invokeinterface() const { return adjusted_invoke_code() == Bytecodes::_invokeinterface; }
bool is_invokevirtual() const { return adjusted_invoke_code() == Bytecodes::_invokevirtual; }
bool is_invokestatic() const { return adjusted_invoke_code() == Bytecodes::_invokestatic; }
bool is_invokespecial() const { return adjusted_invoke_code() == Bytecodes::_invokespecial; }
bool is_valid() const { return is_invokeinterface() ||
is_invokevirtual() ||
is_invokestatic() ||
is_invokespecial(); }
// Creation
inline friend Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci);
// Like Bytecode_invoke_at. Instead it returns NULL if the bci is not at an invoke.
inline friend Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci);
};
inline Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci) {
Bytecode_invoke* b = new Bytecode_invoke(method, bci);
debug_only(b->verify());
return b;
}
inline Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci) {
Bytecode_invoke* b = new Bytecode_invoke(method, bci);
return b->is_valid() ? b : NULL;
}
// Abstraction for all field accesses (put/get field/static_
class Bytecode_field: public Bytecode {
public:
void verify() const;
int index() const;
bool is_static() const;
// Creation
inline friend Bytecode_field* Bytecode_field_at(const methodOop method, address bcp);
};
inline Bytecode_field* Bytecode_field_at(const methodOop method, address bcp) {
Bytecode_field* b = (Bytecode_field*)bcp;
debug_only(b->verify());
return b;
}
// Abstraction for {get,put}static
class Bytecode_static: public Bytecode {
public:
void verify() const;
// Returns the result type of the send by inspecting the field ref
BasicType result_type(methodOop method) const;
// Creation
inline friend Bytecode_static* Bytecode_static_at(const methodOop method, address bcp);
};
inline Bytecode_static* Bytecode_static_at(const methodOop method, address bcp) {
Bytecode_static* b = (Bytecode_static*)bcp;
debug_only(b->verify());
return b;
}
// Abstraction for checkcast
class Bytecode_checkcast: public Bytecode {
public:
void verify() const { assert(Bytecodes::java_code(code()) == Bytecodes::_checkcast, "check checkcast"); }
// Returns index
long index() const { return java_hwrd_at(1); };
// Creation
inline friend Bytecode_checkcast* Bytecode_checkcast_at(address bcp);
};
inline Bytecode_checkcast* Bytecode_checkcast_at(address bcp) {
Bytecode_checkcast* b = (Bytecode_checkcast*)bcp;
debug_only(b->verify());
return b;
}
// Abstraction for instanceof
class Bytecode_instanceof: public Bytecode {
public:
void verify() const { assert(code() == Bytecodes::_instanceof, "check instanceof"); }
// Returns index
long index() const { return java_hwrd_at(1); };
// Creation
inline friend Bytecode_instanceof* Bytecode_instanceof_at(address bcp);
};
inline Bytecode_instanceof* Bytecode_instanceof_at(address bcp) {
Bytecode_instanceof* b = (Bytecode_instanceof*)bcp;
debug_only(b->verify());
return b;
}
class Bytecode_new: public Bytecode {
public:
void verify() const { assert(java_code() == Bytecodes::_new, "check new"); }
// Returns index
long index() const { return java_hwrd_at(1); };
// Creation
inline friend Bytecode_new* Bytecode_new_at(address bcp);
};
inline Bytecode_new* Bytecode_new_at(address bcp) {
Bytecode_new* b = (Bytecode_new*)bcp;
debug_only(b->verify());
return b;
}
class Bytecode_multianewarray: public Bytecode {
public:
void verify() const { assert(java_code() == Bytecodes::_multianewarray, "check new"); }
// Returns index
long index() const { return java_hwrd_at(1); };
// Creation
inline friend Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp);
};
inline Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp) {
Bytecode_multianewarray* b = (Bytecode_multianewarray*)bcp;
debug_only(b->verify());
return b;
}
class Bytecode_anewarray: public Bytecode {
public:
void verify() const { assert(java_code() == Bytecodes::_anewarray, "check anewarray"); }
// Returns index
long index() const { return java_hwrd_at(1); };
// Creation
inline friend Bytecode_anewarray* Bytecode_anewarray_at(address bcp);
};
inline Bytecode_anewarray* Bytecode_anewarray_at(address bcp) {
Bytecode_anewarray* b = (Bytecode_anewarray*)bcp;
debug_only(b->verify());
return b;
}
// Abstraction for ldc, ldc_w and ldc2_w
class Bytecode_loadconstant: public Bytecode {
public:
void verify() const {
Bytecodes::Code stdc = Bytecodes::java_code(code());
assert(stdc == Bytecodes::_ldc ||
stdc == Bytecodes::_ldc_w ||
stdc == Bytecodes::_ldc2_w, "load constant");
}
int index() const;
inline friend Bytecode_loadconstant* Bytecode_loadconstant_at(const methodOop method, address bcp);
};
inline Bytecode_loadconstant* Bytecode_loadconstant_at(const methodOop method, address bcp) {
Bytecode_loadconstant* b = (Bytecode_loadconstant*)bcp;
debug_only(b->verify());
return b;
}