Mercurial > hg > graal-compiler
view src/share/vm/oops/symbolOop.hpp @ 396:4d05b7cb7842
6306922: Dump dump created by +HeapDumpOnOutOfMemoryError should include stack traces for stack roots
Summary: Include stack traces of all threads in the heap dump
Reviewed-by: alanb
author | mchung |
---|---|
date | Tue, 14 Oct 2008 15:16:38 -0700 |
parents | a61af66fc99e |
children | dd57230ba8fe |
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/* * Copyright 1997-2005 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. * */ // A symbolOop is a canonicalized string. // All symbolOops reside in global symbolTable. // See oopFactory::new_symbol for how to allocate a symbolOop class symbolOopDesc : public oopDesc { friend class VMStructs; private: unsigned short _length; // number of UTF8 characters in the symbol jbyte _body[1]; enum { // max_symbol_length is constrained by type of _length max_symbol_length = (1 << 16) -1 }; public: // Low-level access (used with care, since not GC-safe) jbyte* base() { return &_body[0]; } // Returns the largest size symbol we can safely hold. static int max_length() { return max_symbol_length; } static int object_size(int length) { int size = header_size() + (sizeof(unsigned short) + length + HeapWordSize - 1) / HeapWordSize; return align_object_size(size); } int object_size() { return object_size(utf8_length()); } int byte_at(int index) const { assert(index >=0 && index < _length, "symbol index overflow"); return ((symbolOopDesc*)this)->base()[index]; } void byte_at_put(int index, int value) { assert(index >=0 && index < _length, "symbol index overflow"); ((symbolOopDesc*)this)->base()[index] = value; } jbyte* bytes() { return base(); } int utf8_length() const { return _length; } void set_utf8_length(int len) { _length = len; } // Compares the symbol with a string bool equals(const char* str, int len) const; // Three-way compare for sorting; returns -1/0/1 if receiver is </==/> than arg // note that the ordering is not alfabetical inline int fast_compare(symbolOop other) const; // Returns receiver converted to null-terminated UTF-8 string; string is // allocated in resource area, or in the char buffer provided by caller. char* as_C_string() const; char* as_C_string(char* buf, int size) const; // Use buf if needed buffer length is <= size. char* as_C_string_flexible_buffer(Thread* t, char* buf, int size) const; // Returns a null terminated utf8 string in a resource array char* as_utf8() const { return as_C_string(); } char* as_utf8_flexible_buffer(Thread* t, char* buf, int size) const { return as_C_string_flexible_buffer(t, buf, size); } jchar* as_unicode(int& length) const; // Treating this symbol as a class name, returns the Java name for the class. // String is allocated in resource area if buffer is not provided. // See Klass::external_name() const char* as_klass_external_name() const; const char* as_klass_external_name(char* buf, int size) const; bool object_is_parsable() const { return (utf8_length() > 0 || (oop)this == Universe::emptySymbol()); } // Printing void print_symbol_on(outputStream* st = NULL); }; // Note: this comparison is used for vtable sorting only; it doesn't matter // what order it defines, as long as it is a total, time-invariant order // Since symbolOops are in permSpace, their relative order in memory never changes, // so use address comparison for speed int symbolOopDesc::fast_compare(symbolOop other) const { return (((uintptr_t)this < (uintptr_t)other) ? -1 : ((uintptr_t)this == (uintptr_t) other) ? 0 : 1); }