Mon, 13 Feb 2012 02:29:22 -0800
7141329: Strange values of stack_size in -XX:+TraceMethodHandles output
Reviewed-by: kvn, never
1 /*
2 * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #ifdef COMPILER2
27 #include "asm/assembler.hpp"
28 #include "assembler_x86.inline.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "code/vmreg.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "nativeInst_x86.hpp"
33 #include "opto/runtime.hpp"
34 #include "runtime/interfaceSupport.hpp"
35 #include "runtime/sharedRuntime.hpp"
36 #include "runtime/stubRoutines.hpp"
37 #include "runtime/vframeArray.hpp"
38 #include "utilities/globalDefinitions.hpp"
39 #include "vmreg_x86.inline.hpp"
40 #endif
43 #define __ masm->
45 //------------------------------generate_exception_blob---------------------------
46 // creates exception blob at the end
47 // Using exception blob, this code is jumped from a compiled method.
48 //
49 // Given an exception pc at a call we call into the runtime for the
50 // handler in this method. This handler might merely restore state
51 // (i.e. callee save registers) unwind the frame and jump to the
52 // exception handler for the nmethod if there is no Java level handler
53 // for the nmethod.
54 //
55 // This code is entered with a jmp.
56 //
57 // Arguments:
58 // rax: exception oop
59 // rdx: exception pc
60 //
61 // Results:
62 // rax: exception oop
63 // rdx: exception pc in caller or ???
64 // destination: exception handler of caller
65 //
66 // Note: the exception pc MUST be at a call (precise debug information)
67 // Only register rax, rdx, rcx are not callee saved.
68 //
70 void OptoRuntime::generate_exception_blob() {
72 // Capture info about frame layout
73 enum layout {
74 thread_off, // last_java_sp
75 // The frame sender code expects that rbp will be in the "natural" place and
76 // will override any oopMap setting for it. We must therefore force the layout
77 // so that it agrees with the frame sender code.
78 rbp_off,
79 return_off, // slot for return address
80 framesize
81 };
83 // allocate space for the code
84 ResourceMark rm;
85 // setup code generation tools
86 CodeBuffer buffer("exception_blob", 512, 512);
87 MacroAssembler* masm = new MacroAssembler(&buffer);
89 OopMapSet *oop_maps = new OopMapSet();
91 address start = __ pc();
93 __ push(rdx);
94 __ subptr(rsp, return_off * wordSize); // Prolog!
96 // rbp, location is implicitly known
97 __ movptr(Address(rsp,rbp_off *wordSize), rbp);
99 // Store exception in Thread object. We cannot pass any arguments to the
100 // handle_exception call, since we do not want to make any assumption
101 // about the size of the frame where the exception happened in.
102 __ get_thread(rcx);
103 __ movptr(Address(rcx, JavaThread::exception_oop_offset()), rax);
104 __ movptr(Address(rcx, JavaThread::exception_pc_offset()), rdx);
106 // This call does all the hard work. It checks if an exception handler
107 // exists in the method.
108 // If so, it returns the handler address.
109 // If not, it prepares for stack-unwinding, restoring the callee-save
110 // registers of the frame being removed.
111 //
112 __ movptr(Address(rsp, thread_off * wordSize), rcx); // Thread is first argument
113 __ set_last_Java_frame(rcx, noreg, noreg, NULL);
115 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C)));
117 // No registers to map, rbp is known implicitly
118 oop_maps->add_gc_map( __ pc() - start, new OopMap( framesize, 0 ));
119 __ get_thread(rcx);
120 __ reset_last_Java_frame(rcx, false, false);
122 // Restore callee-saved registers
123 __ movptr(rbp, Address(rsp, rbp_off * wordSize));
125 __ addptr(rsp, return_off * wordSize); // Epilog!
126 __ pop(rdx); // Exception pc
128 // rax: exception handler for given <exception oop/exception pc>
130 // Restore SP from BP if the exception PC is a MethodHandle call site.
131 __ cmpl(Address(rcx, JavaThread::is_method_handle_return_offset()), 0);
132 __ cmovptr(Assembler::notEqual, rsp, rbp_mh_SP_save);
134 // We have a handler in rax, (could be deopt blob)
135 // rdx - throwing pc, deopt blob will need it.
137 __ push(rax);
139 // Get the exception
140 __ movptr(rax, Address(rcx, JavaThread::exception_oop_offset()));
141 // Get the exception pc in case we are deoptimized
142 __ movptr(rdx, Address(rcx, JavaThread::exception_pc_offset()));
143 #ifdef ASSERT
144 __ movptr(Address(rcx, JavaThread::exception_handler_pc_offset()), NULL_WORD);
145 __ movptr(Address(rcx, JavaThread::exception_pc_offset()), NULL_WORD);
146 #endif
147 // Clear the exception oop so GC no longer processes it as a root.
148 __ movptr(Address(rcx, JavaThread::exception_oop_offset()), NULL_WORD);
150 __ pop(rcx);
152 // rax: exception oop
153 // rcx: exception handler
154 // rdx: exception pc
155 __ jmp (rcx);
157 // -------------
158 // make sure all code is generated
159 masm->flush();
161 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize);
162 }