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annotate src/os/aix/vm/porting_aix.hpp @ 21947:9f70fc90169d

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Truffle: remove expensive assertion
author Andreas Woess <andreas.woess@oracle.com>
date Wed, 17 Jun 2015 04:09:30 +0200
parents 666e6ce3976c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright 2012, 2013 SAP AG. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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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.
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22 *
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23 */
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24
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25 #include <stddef.h>
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26
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27 // Header file to contain porting-relevant code which does not have a
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28 // home anywhere else and which can not go into os_<platform>.h because
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29 // that header is included inside the os class definition, hence all
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30 // its content is part of the os class.
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31
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32 // Aix' own version of dladdr().
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33 // This function tries to mimick dladdr(3) on Linux
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34 // (see http://linux.die.net/man/3/dladdr)
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35 // dladdr(3) is not POSIX but a GNU extension, and is not available on AIX.
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36 //
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37 // Differences between AIX dladdr and Linux dladdr:
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38 //
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39 // 1) Dl_info.dli_fbase: can never work, is disabled.
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40 // A loaded image on AIX is divided in multiple segments, at least two
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41 // (text and data) but potentially also far more. This is because the loader may
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42 // load each member into an own segment, as for instance happens with the libC.a
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43 // 2) Dl_info.dli_sname: This only works for code symbols (functions); for data, a
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44 // zero-length string is returned ("").
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45 // 3) Dl_info.dli_saddr: For code, this will return the entry point of the function,
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46 // not the function descriptor.
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47
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48 typedef struct {
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49 const char *dli_fname; // file path of loaded library
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50 // void *dli_fbase;
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51 const char *dli_sname; // symbol name; "" if not known
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52 void *dli_saddr; // address of *entry* of function; not function descriptor;
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53 } Dl_info;
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54
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55 // Note: we export this to use it inside J2se too
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56 #ifdef __cplusplus
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57 extern "C"
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58 #endif
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59 int dladdr(void *addr, Dl_info *info);
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60
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61
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62 // The semantics in this file are thus that codeptr_t is a *real code ptr*.
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63 // This means that any function taking codeptr_t as arguments will assume
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64 // a real codeptr and won't handle function descriptors (eg getFuncName),
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65 // whereas functions taking address as args will deal with function
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66 // descriptors (eg os::dll_address_to_library_name).
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67 typedef unsigned int* codeptr_t;
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68
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69 // helper function - given a program counter, tries to locate the traceback table and
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70 // returns info from it (like, most importantly, function name, displacement of the
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71 // pc inside the function, and the traceback table itself.
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72 #ifdef __cplusplus
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73 extern "C"
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74 #endif
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75 int getFuncName(
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76 codeptr_t pc, // [in] program counter
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77 char* p_name, size_t namelen, // [out] optional: user provided buffer for the function name
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78 int* p_displacement, // [out] optional: displacement
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79 const struct tbtable** p_tb, // [out] optional: ptr to traceback table to get further information
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80 char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages
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81 );