Mercurial > hg > truffle
comparison src/cpu/sparc/vm/runtime_sparc.cpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 6b2273dd6fa9 |
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1 /* | |
2 * Copyright 1998-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_runtime_sparc.cpp.incl" | |
27 | |
28 | |
29 #define __ masm-> | |
30 | |
31 ExceptionBlob *OptoRuntime::_exception_blob; | |
32 | |
33 //------------------------------ generate_exception_blob --------------------------- | |
34 // creates exception blob at the end | |
35 // Using exception blob, this code is jumped from a compiled method. | |
36 // (see emit_exception_handler in sparc.ad file) | |
37 // | |
38 // Given an exception pc at a call we call into the runtime for the | |
39 // handler in this method. This handler might merely restore state | |
40 // (i.e. callee save registers) unwind the frame and jump to the | |
41 // exception handler for the nmethod if there is no Java level handler | |
42 // for the nmethod. | |
43 // | |
44 // This code is entered with a jmp. | |
45 // | |
46 // Arguments: | |
47 // O0: exception oop | |
48 // O1: exception pc | |
49 // | |
50 // Results: | |
51 // O0: exception oop | |
52 // O1: exception pc in caller or ??? | |
53 // destination: exception handler of caller | |
54 // | |
55 // Note: the exception pc MUST be at a call (precise debug information) | |
56 // | |
57 void OptoRuntime::generate_exception_blob() { | |
58 // allocate space for code | |
59 ResourceMark rm; | |
60 int pad = VerifyThread ? 256 : 0;// Extra slop space for more verify code | |
61 | |
62 // setup code generation tools | |
63 // Measured 8/7/03 at 256 in 32bit debug build (no VerifyThread) | |
64 // Measured 8/7/03 at 528 in 32bit debug build (VerifyThread) | |
65 CodeBuffer buffer("exception_blob", 600+pad, 512); | |
66 MacroAssembler* masm = new MacroAssembler(&buffer); | |
67 | |
68 int framesize_in_bytes = __ total_frame_size_in_bytes(0); | |
69 int framesize_in_words = framesize_in_bytes / wordSize; | |
70 int framesize_in_slots = framesize_in_bytes / sizeof(jint); | |
71 | |
72 Label L; | |
73 | |
74 int start = __ offset(); | |
75 | |
76 __ verify_thread(); | |
77 __ st_ptr(Oexception, Address(G2_thread, 0, in_bytes(JavaThread::exception_oop_offset()))); | |
78 __ st_ptr(Oissuing_pc, Address(G2_thread, 0, in_bytes(JavaThread::exception_pc_offset()))); | |
79 | |
80 // This call does all the hard work. It checks if an exception catch | |
81 // exists in the method. | |
82 // If so, it returns the handler address. | |
83 // If the nmethod has been deoptimized and it had a handler the handler | |
84 // address is the deopt blob unpack_with_exception entry. | |
85 // | |
86 // If no handler exists it prepares for stack-unwinding, restoring the callee-save | |
87 // registers of the frame being removed. | |
88 // | |
89 __ save_frame(0); | |
90 | |
91 __ mov(G2_thread, O0); | |
92 __ set_last_Java_frame(SP, noreg); | |
93 __ save_thread(L7_thread_cache); | |
94 | |
95 // This call can block at exit and nmethod can be deoptimized at that | |
96 // point. If the nmethod had a catch point we would jump to the | |
97 // now deoptimized catch point and fall thru the vanilla deopt | |
98 // path and lose the exception | |
99 // Sure would be simpler if this call didn't block! | |
100 __ call(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C), relocInfo::runtime_call_type); | |
101 __ delayed()->mov(L7_thread_cache, O0); | |
102 | |
103 // Set an oopmap for the call site. This oopmap will only be used if we | |
104 // are unwinding the stack. Hence, all locations will be dead. | |
105 // Callee-saved registers will be the same as the frame above (i.e., | |
106 // handle_exception_stub), since they were restored when we got the | |
107 // exception. | |
108 | |
109 OopMapSet *oop_maps = new OopMapSet(); | |
110 oop_maps->add_gc_map( __ offset()-start, new OopMap(framesize_in_slots, 0)); | |
111 | |
112 __ bind(L); | |
113 __ restore_thread(L7_thread_cache); | |
114 __ reset_last_Java_frame(); | |
115 | |
116 __ mov(O0, G3_scratch); // Move handler address to temp | |
117 __ restore(); | |
118 | |
119 // G3_scratch contains handler address | |
120 // Since this may be the deopt blob we must set O7 to look like we returned | |
121 // from the original pc that threw the exception | |
122 | |
123 __ ld_ptr(Address(G2_thread, 0, in_bytes(JavaThread::exception_pc_offset())), O7); | |
124 __ sub(O7, frame::pc_return_offset, O7); | |
125 | |
126 | |
127 assert(Assembler::is_simm13(in_bytes(JavaThread::exception_oop_offset())), "exception offset overflows simm13, following ld instruction cannot be in delay slot"); | |
128 __ ld_ptr(Address(G2_thread, 0, in_bytes(JavaThread::exception_oop_offset())), Oexception); // O0 | |
129 #ifdef ASSERT | |
130 __ st_ptr(G0, Address(G2_thread, 0, in_bytes(JavaThread::exception_handler_pc_offset()))); | |
131 __ st_ptr(G0, Address(G2_thread, 0, in_bytes(JavaThread::exception_pc_offset()))); | |
132 #endif | |
133 __ JMP(G3_scratch, 0); | |
134 // Clear the exception oop so GC no longer processes it as a root. | |
135 __ delayed()->st_ptr(G0, Address(G2_thread, 0, in_bytes(JavaThread::exception_oop_offset()))); | |
136 | |
137 // ------------- | |
138 // make sure all code is generated | |
139 masm->flush(); | |
140 | |
141 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize_in_words); | |
142 } |