| 1 | // Functions for Exception Support for Java.
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| 2 |
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| 3 | /* Copyright (C) 1998, 1999, 2001, 2002 Free Software Foundation
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| 4 |
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| 5 | This file is part of libgcj.
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| 6 |
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| 7 | This software is copyrighted work licensed under the terms of the
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| 8 | Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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| 9 | details. */
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| 10 |
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| 11 | #include <config.h>
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| 12 |
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| 13 | #include <stddef.h>
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| 14 | #include <stdlib.h>
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| 15 |
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| 16 | #include <java/lang/Class.h>
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| 17 | #include <java/lang/NullPointerException.h>
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| 18 | #include <gcj/cni.h>
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| 19 | #include <jvm.h>
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| 20 |
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| 21 | // unwind-pe.h uses std::abort(), but sometimes we compile libjava
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| 22 | // without libstdc++-v3. The following hack forces it to use
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| 23 | // stdlib.h's abort().
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| 24 | namespace std
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| 25 | {
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| 26 | static __attribute__ ((__noreturn__)) void
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| 27 | abort ()
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| 28 | {
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| 29 | ::abort ();
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| 30 | }
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| 31 | }
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| 32 | #include "unwind.h"
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| 33 |
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| 34 | struct alignment_test_struct
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| 35 | {
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| 36 | char space;
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| 37 | char end[0] __attribute__((aligned));
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| 38 | };
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| 39 |
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| 40 | struct java_exception_header
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| 41 | {
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| 42 | /* Cache handler details between Phase 1 and Phase 2. */
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| 43 | _Unwind_Ptr landingPad;
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| 44 | int handlerSwitchValue;
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| 45 |
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| 46 | /* The object being thrown. Compiled code expects this to be immediately
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| 47 | before the generic exception header. Which is complicated by the fact
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| 48 | that _Unwind_Exception is ((aligned)). */
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| 49 |
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| 50 | char pad[sizeof(jthrowable) < sizeof(alignment_test_struct)
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| 51 | ? sizeof(alignment_test_struct) - sizeof(jthrowable) : 0]
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| 52 | __attribute__((aligned));
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| 53 |
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| 54 | jthrowable value;
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| 55 |
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| 56 | /* The generic exception header. */
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| 57 | _Unwind_Exception unwindHeader;
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| 58 | };
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| 59 |
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| 60 | // This is the exception class we report -- "GNUCJAVA".
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| 61 | const _Unwind_Exception_Class __gcj_exception_class
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| 62 | = ((((((((_Unwind_Exception_Class) 'G'
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| 63 | << 8 | (_Unwind_Exception_Class) 'N')
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| 64 | << 8 | (_Unwind_Exception_Class) 'U')
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| 65 | << 8 | (_Unwind_Exception_Class) 'C')
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| 66 | << 8 | (_Unwind_Exception_Class) 'J')
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| 67 | << 8 | (_Unwind_Exception_Class) 'A')
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| 68 | << 8 | (_Unwind_Exception_Class) 'V')
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| 69 | << 8 | (_Unwind_Exception_Class) 'A');
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| 70 |
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| 71 |
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| 72 | static inline java_exception_header *
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| 73 | get_exception_header_from_ue (_Unwind_Exception *exc)
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| 74 | {
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| 75 | return reinterpret_cast<java_exception_header *>(exc + 1) - 1;
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| 76 | }
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| 77 |
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| 78 | /* Perform a throw, Java style. Throw will unwind through this call,
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| 79 | so there better not be any handlers or exception thrown here. */
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| 80 |
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| 81 | extern "C" void
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| 82 | _Jv_Throw (jthrowable value)
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| 83 | {
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| 84 | java_exception_header *xh
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| 85 | = static_cast<java_exception_header *>(_Jv_AllocRawObj (sizeof (*xh)));
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| 86 |
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| 87 | if (value == NULL)
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| 88 | value = new java::lang::NullPointerException ();
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| 89 | xh->value = value;
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| 90 |
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| 91 | xh->unwindHeader.exception_class = __gcj_exception_class;
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| 92 | xh->unwindHeader.exception_cleanup = NULL;
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| 93 |
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| 94 | /* We're happy with setjmp/longjmp exceptions or region-based
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| 95 | exception handlers: entry points are provided here for both. */
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| 96 | _Unwind_Reason_Code code;
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| 97 | #ifdef SJLJ_EXCEPTIONS
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| 98 | code = _Unwind_SjLj_RaiseException (&xh->unwindHeader);
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| 99 | #else
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| 100 | code = _Unwind_RaiseException (&xh->unwindHeader);
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| 101 | #endif
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| 102 |
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| 103 | /* If code == _URC_END_OF_STACK, then we reached top of stack without
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| 104 | finding a handler for the exception. Since each thread is run in
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| 105 | a try/catch, this oughtn't happen. If code is something else, we
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| 106 | encountered some sort of heinous lossage from which we could not
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| 107 | recover. As is the way of such things, almost certainly we will have
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| 108 | crashed before now, rather than actually being able to diagnose the
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| 109 | problem. */
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| 110 | abort();
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| 111 | }
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| 112 |
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| 113 | |
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| 114 |
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| 115 | #include "unwind-pe.h"
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