84N/A

84N/A#ifndef SHARE_VM_OOPS_CONSTMETHODOOP_HPP

5072N/A#define SHARE_VM_OOPS_CONSTMETHODOOP_HPP

5612N/A

84N/A#include "oops/oop.hpp"

84N/A#include "oops/typeArrayOop.hpp"

84N/A

1777N/A

1777N/A

828N/Aclass CheckedExceptionElement VALUE_OBJ_CLASS_SPEC {

84N/A public:

1777N/A u2 class_cp_index;

1777N/A};

1777N/A

1777N/A

class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC {

public:

u2 start_bci;

u2 length;

u2 name_cp_index;

u2 descriptor_cp_index;

u2 signature_cp_index;

u2 slot;

};

class constMethodOopDesc : public oopDesc {

friend class constMethodKlass;

friend class VMStructs;

private:

enum {

_has_linenumber_table = 1,

_has_checked_exceptions = 2,

_has_localvariable_table = 4

};

// Bit vector of signature

// Callers interpret 0=not initialized yet and

// -1=too many args to fix, must parse the slow way.

// The real initial value is special to account for nonatomicity of 64 bit

// loads and stores. This value may updated and read without a lock by

// multiple threads, so is volatile.

volatile uint64_t _fingerprint;

volatile bool _is_conc_safe; // if true, safe for concurrent GC processing

public:

oop* oop_block_beg() const { return adr_method(); }

oop* oop_block_end() const { return adr_exception_table() + 1; }

private:

//

// The oop block. See comment in klass.hpp before making changes.

//

// Backpointer to non-const methodOop (needed for some JVMTI operations)

methodOop _method;

// Raw stackmap data for the method

typeArrayOop _stackmap_data;

// The exception handler table. 4-tuples of ints [start_pc, end_pc,

// handler_pc, catch_type index] For methods with no exceptions the

// table is pointing to Universe::the_empty_int_array

typeArrayOop _exception_table;

//

// End of the oop block.

//

int _constMethod_size;

jbyte _interpreter_kind;

jbyte _flags;

// Size of Java bytecodes allocated immediately after methodOop.

u2 _code_size;

u2 _name_index; // Method name (index in constant pool)

u2 _signature_index; // Method signature (index in constant pool)

u2 _method_idnum; // unique identification number for the method within the class

// initially corresponds to the index into the methods array.

// but this may change with redefinition

u2 _generic_signature_index; // Generic signature (index in constant pool, 0 if absent)

public:

// Inlined tables

void set_inlined_tables_length(int checked_exceptions_len,

int compressed_line_number_size,

int localvariable_table_len);

bool has_linenumber_table() const

{ return (_flags & _has_linenumber_table) != 0; }

bool has_checked_exceptions() const

{ return (_flags & _has_checked_exceptions) != 0; }

bool has_localvariable_table() const

{ return (_flags & _has_localvariable_table) != 0; }

void set_interpreter_kind(int kind) { _interpreter_kind = kind; }

int interpreter_kind(void) const { return _interpreter_kind; }

// backpointer to non-const methodOop

methodOop method() const { return _method; }

void set_method(methodOop m) { oop_store_without_check((oop*)&_method, (oop) m); }

// stackmap table data

typeArrayOop stackmap_data() const { return _stackmap_data; }

void set_stackmap_data(typeArrayOop sd) {

oop_store_without_check((oop*)&_stackmap_data, (oop)sd);

}

bool has_stackmap_table() const { return _stackmap_data != NULL; }

// exception handler table

typeArrayOop exception_table() const { return _exception_table; }

void set_exception_table(typeArrayOop e) { oop_store_without_check((oop*) &_exception_table, (oop) e); }

bool has_exception_handler() const { return exception_table() != NULL && exception_table()->length() > 0; }

void init_fingerprint() {

const uint64_t initval = CONST64(0x8000000000000000);

_fingerprint = initval;

}

uint64_t fingerprint() const {

// Since reads aren't atomic for 64 bits, if any of the high or low order

// word is the initial value, return 0. See init_fingerprint for initval.

uint high_fp = (uint)(_fingerprint >> 32);

if ((int) _fingerprint == 0 || high_fp == 0x80000000) {

return 0L;

} else {

return _fingerprint;

}

}

uint64_t set_fingerprint(uint64_t new_fingerprint) {

#ifdef ASSERT

// Assert only valid if complete/valid 64 bit _fingerprint value is read.

uint64_t oldfp = fingerprint();

#endif // ASSERT

_fingerprint = new_fingerprint;

assert(oldfp == 0L || new_fingerprint == oldfp,

"fingerprint cannot change");

assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0,

"fingerprint should call init to set initial value");

return new_fingerprint;

}

// name

int name_index() const { return _name_index; }

void set_name_index(int index) { _name_index = index; }

// signature

int signature_index() const { return _signature_index; }

void set_signature_index(int index) { _signature_index = index; }

// generics support

int generic_signature_index() const { return _generic_signature_index; }

void set_generic_signature_index(int index) { _generic_signature_index = index; }

// Sizing

static int header_size() {

return sizeof(constMethodOopDesc)/HeapWordSize;

}

// Object size needed

static int object_size(int code_size, int compressed_line_number_size,

int local_variable_table_length,

int checked_exceptions_length);

int object_size() const { return _constMethod_size; }

void set_constMethod_size(int size) { _constMethod_size = size; }

// Is object parsable by gc

bool object_is_parsable() { return object_size() > 0; }

// code size

int code_size() const { return _code_size; }

void set_code_size(int size) {

assert(max_method_code_size < (1 << 16),

"u2 is too small to hold method code size in general");

assert(0 <= size && size <= max_method_code_size, "invalid code size");

_code_size = size;

}

// linenumber table - note that length is unknown until decompression,

// see class CompressedLineNumberReadStream.

u_char* compressed_linenumber_table() const; // not preserved by gc

u2* checked_exceptions_length_addr() const;

u2* localvariable_table_length_addr() const;

// checked exceptions

int checked_exceptions_length() const;

CheckedExceptionElement* checked_exceptions_start() const;

// localvariable table

int localvariable_table_length() const;

LocalVariableTableElement* localvariable_table_start() const;

// byte codes

void set_code(address code) {

if (code_size() > 0) {

memcpy(code_base(), code, code_size());

}

}

address code_base() const { return (address) (this+1); }

address code_end() const { return code_base() + code_size(); }

bool contains(address bcp) const { return code_base() <= bcp

&& bcp < code_end(); }

// Offset to bytecodes

static ByteSize codes_offset()

{ return in_ByteSize(sizeof(constMethodOopDesc)); }

// interpreter support

static ByteSize exception_table_offset()

{ return byte_offset_of(constMethodOopDesc, _exception_table); }

// Garbage collection support

oop* adr_method() const { return (oop*)&_method; }

oop* adr_stackmap_data() const { return (oop*)&_stackmap_data; }

oop* adr_exception_table() const { return (oop*)&_exception_table; }

bool is_conc_safe() { return _is_conc_safe; }

void set_is_conc_safe(bool v) { _is_conc_safe = v; }

// Unique id for the method

static const u2 MAX_IDNUM;

static const u2 UNSET_IDNUM;

u2 method_idnum() const { return _method_idnum; }

void set_method_idnum(u2 idnum) { _method_idnum = idnum; }

private:

// Since the size of the compressed line number table is unknown, the

// offsets of the other variable sized sections are computed backwards

// from the end of the constMethodOop.

// First byte after constMethodOop

address constMethod_end() const

{ return (address)((oop*)this + _constMethod_size); }

// Last short in constMethodOop

u2* last_u2_element() const

{ return (u2*)constMethod_end() - 1; }

};

#endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP