Mercurial > hg > truffle
annotate src/share/vm/runtime/javaFrameAnchor.hpp @ 1721:413ad0331a0c
6977924: Changes for 6975078 produce build error with certain gcc versions
Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error.
Reviewed-by: jcoomes, ysr, phh
| author | johnc |
|---|---|
| date | Wed, 18 Aug 2010 10:59:06 -0700 |
| parents | 126ea7725993 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2002, 2005, Oracle and/or its affiliates. All rights reserved. |
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| 13 * accompanied this code). | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 // | |
| 25 // An object for encapsulating the machine/os dependent part of a JavaThread frame state | |
| 26 // | |
| 27 class JavaThread; | |
| 28 | |
| 29 class JavaFrameAnchor VALUE_OBJ_CLASS_SPEC { | |
| 30 // Too many friends... | |
| 31 friend class CallNativeDirectNode; | |
| 32 friend class OptoRuntime; | |
| 33 friend class Runtime1; | |
| 34 friend class StubAssembler; | |
| 35 friend class CallRuntimeDirectNode; | |
| 36 friend class MacroAssembler; | |
| 37 friend class InterpreterGenerator; | |
| 38 friend class LIR_Assembler; | |
| 39 friend class GraphKit; | |
| 40 friend class StubGenerator; | |
| 41 friend class JavaThread; | |
| 42 friend class frame; | |
| 43 friend class VMStructs; | |
| 44 friend class BytecodeInterpreter; | |
| 45 friend class JavaCallWrapper; | |
| 46 | |
| 47 private: | |
| 48 // | |
| 49 // Whenever _last_Java_sp != NULL other anchor fields MUST be valid! | |
| 50 // The stack may not be walkable [check with walkable() ] but the values must be valid. | |
| 51 // The profiler apparently depends on this. | |
| 52 // | |
| 53 intptr_t* volatile _last_Java_sp; | |
| 54 | |
| 55 // Whenever we call from Java to native we can not be assured that the return | |
| 56 // address that composes the last_Java_frame will be in an accessible location | |
| 57 // so calls from Java to native store that pc (or one good enough to locate | |
| 58 // the oopmap) in the frame anchor. Since the frames that call from Java to | |
| 59 // native are never deoptimized we never need to patch the pc and so this | |
| 60 // is acceptable. | |
| 61 volatile address _last_Java_pc; | |
| 62 | |
| 63 // tells whether the last Java frame is set | |
| 64 // It is important that when last_Java_sp != NULL that the rest of the frame | |
| 65 // anchor (including platform specific) all be valid. | |
| 66 | |
| 67 bool has_last_Java_frame() const { return _last_Java_sp != NULL; } | |
| 68 // This is very dangerous unless sp == NULL | |
| 69 // Invalidate the anchor so that has_last_frame is false | |
| 70 // and no one should look at the other fields. | |
| 71 void zap(void) { _last_Java_sp = NULL; } | |
| 72 | |
| 73 #include "incls/_javaFrameAnchor_pd.hpp.incl" | |
| 74 | |
| 75 public: | |
| 76 JavaFrameAnchor() { clear(); } | |
| 77 JavaFrameAnchor(JavaFrameAnchor *src) { copy(src); } | |
| 78 | |
| 79 void set_last_Java_pc(address pc) { _last_Java_pc = pc; } | |
| 80 | |
| 81 // Assembly stub generation helpers | |
| 82 | |
| 83 static ByteSize last_Java_sp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_sp); } | |
| 84 static ByteSize last_Java_pc_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_pc); } | |
| 85 | |
| 86 }; |