1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/code/scopeDesc.hpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,123 @@
1.4 +/*
1.5 + * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +// SimpleScopeDesc is used when all you need to extract from
1.29 +// a given pc,nmethod pair is a methodOop and a bci. This is
1.30 +// quite a bit faster than allocating a full ScopeDesc, but
1.31 +// very limited in abilities.
1.32 +
1.33 +class SimpleScopeDesc : public StackObj {
1.34 + private:
1.35 + methodOop _method;
1.36 + int _bci;
1.37 +
1.38 + public:
1.39 + SimpleScopeDesc(nmethod* code,address pc) {
1.40 + PcDesc* pc_desc = code->pc_desc_at(pc);
1.41 + assert(pc_desc != NULL, "Must be able to find matching PcDesc");
1.42 + DebugInfoReadStream buffer(code, pc_desc->scope_decode_offset());
1.43 + int ignore_sender = buffer.read_int();
1.44 + _method = methodOop(buffer.read_oop());
1.45 + _bci = buffer.read_bci();
1.46 + }
1.47 +
1.48 + methodOop method() { return _method; }
1.49 + int bci() { return _bci; }
1.50 +};
1.51 +
1.52 +// ScopeDescs contain the information that makes source-level debugging of
1.53 +// nmethods possible; each scopeDesc describes a method activation
1.54 +
1.55 +class ScopeDesc : public ResourceObj {
1.56 + public:
1.57 + // Constructor
1.58 + ScopeDesc(const nmethod* code, int decode_offset, int obj_decode_offset);
1.59 +
1.60 + // Calls above, giving default value of "serialized_null" to the
1.61 + // "obj_decode_offset" argument. (We don't use a default argument to
1.62 + // avoid a .hpp-.hpp dependency.)
1.63 + ScopeDesc(const nmethod* code, int decode_offset);
1.64 +
1.65 + // JVM state
1.66 + methodHandle method() const { return _method; }
1.67 + int bci() const { return _bci; }
1.68 +
1.69 + GrowableArray<ScopeValue*>* locals();
1.70 + GrowableArray<ScopeValue*>* expressions();
1.71 + GrowableArray<MonitorValue*>* monitors();
1.72 + GrowableArray<ScopeValue*>* objects();
1.73 +
1.74 + // Stack walking, returns NULL if this is the outer most scope.
1.75 + ScopeDesc* sender() const;
1.76 +
1.77 + // Returns where the scope was decoded
1.78 + int decode_offset() const { return _decode_offset; }
1.79 +
1.80 + // Tells whether sender() returns NULL
1.81 + bool is_top() const;
1.82 + // Tells whether sd is equal to this
1.83 + bool is_equal(ScopeDesc* sd) const;
1.84 +
1.85 + private:
1.86 + // Alternative constructor
1.87 + ScopeDesc(const ScopeDesc* parent);
1.88 +
1.89 + // JVM state
1.90 + methodHandle _method;
1.91 + int _bci;
1.92 +
1.93 + // Decoding offsets
1.94 + int _decode_offset;
1.95 + int _sender_decode_offset;
1.96 + int _locals_decode_offset;
1.97 + int _expressions_decode_offset;
1.98 + int _monitors_decode_offset;
1.99 +
1.100 + // Object pool
1.101 + GrowableArray<ScopeValue*>* _objects;
1.102 +
1.103 + // Nmethod information
1.104 + const nmethod* _code;
1.105 +
1.106 + // Decoding operations
1.107 + void decode_body();
1.108 + GrowableArray<ScopeValue*>* decode_scope_values(int decode_offset);
1.109 + GrowableArray<MonitorValue*>* decode_monitor_values(int decode_offset);
1.110 + GrowableArray<ScopeValue*>* decode_object_values(int decode_offset);
1.111 +
1.112 + DebugInfoReadStream* stream_at(int decode_offset) const;
1.113 +
1.114 +
1.115 + public:
1.116 + // Verification
1.117 + void verify();
1.118 +
1.119 +#ifndef PRODUCT
1.120 + public:
1.121 + // Printing support
1.122 + void print_on(outputStream* st) const;
1.123 + void print_on(outputStream* st, PcDesc* pd) const;
1.124 + void print_value_on(outputStream* st) const;
1.125 +#endif
1.126 +};
