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annotate src/os/aix/vm/porting_aix.cpp @ 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:
rev   line source
14415
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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 "asm/assembler.hpp"
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26 #include "loadlib_aix.hpp"
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27 #include "porting_aix.hpp"
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28 #include "utilities/debug.hpp"
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29
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30 #include <demangle.h>
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31 #include <sys/debug.h>
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32
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33 //////////////////////////////////
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34 // Provide implementation for dladdr based on LoadedLibraries pool and
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35 // traceback table scan (see getFuncName).
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36
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37 // Search traceback table in stack,
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38 // return procedure name from trace back table.
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39 #define MAX_FUNC_SEARCH_LEN 0x10000
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40 // Any PC below this value is considered toast.
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41 #define MINIMUM_VALUE_FOR_PC ((unsigned int*)0x1024)
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42
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43 #define PTRDIFF_BYTES(p1,p2) (((ptrdiff_t)p1) - ((ptrdiff_t)p2))
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44
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45 // Align a pointer without having to cast.
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46 inline char* align_ptr_up(char* ptr, intptr_t alignment) {
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47 return (char*) align_size_up((intptr_t)ptr, alignment);
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48 }
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49
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50 // Trace if verbose to tty.
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51 // I use these now instead of the Xtrace system because the latter is
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52 // not available at init time, hence worthless. Until we fix this, all
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53 // tracing here is done with -XX:+Verbose.
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54 #define trcVerbose(fmt, ...) { \
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55 if (Verbose) { \
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56 fprintf(stderr, fmt, ##__VA_ARGS__); \
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57 fputc('\n', stderr); fflush(stderr); \
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58 } \
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59 }
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60 #define ERRBYE(s) { trcVerbose(s); return -1; }
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61
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62 // Unfortunately, the interface of dladdr makes the implementator
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63 // responsible for maintaining memory for function name/library
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64 // name. I guess this is because most OS's keep those values as part
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65 // of the mapped executable image ready to use. On AIX, this doesn't
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66 // work, so I have to keep the returned strings. For now, I do this in
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67 // a primitive string map. Should this turn out to be a performance
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68 // problem, a better hashmap has to be used.
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69 class fixed_strings {
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70 struct node {
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71 char* v;
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72 node* next;
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73 };
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74
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75 node* first;
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76
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77 public:
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78
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79 fixed_strings() : first(0) {}
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80 ~fixed_strings() {
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81 node* n = first;
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82 while (n) {
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83 node* p = n;
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84 n = n->next;
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85 free(p->v);
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86 delete p;
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87 }
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88 }
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89
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90 char* intern(const char* s) {
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91 for (node* n = first; n; n = n->next) {
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92 if (strcmp(n->v, s) == 0) {
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93 return n->v;
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94 }
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95 }
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96 node* p = new node;
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97 p->v = strdup(s);
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98 p->next = first;
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99 first = p;
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100 return p->v;
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101 }
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102 };
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103
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104 static fixed_strings dladdr_fixed_strings;
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105
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106 // Given a code pointer, returns the function name and the displacement.
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107 // Function looks for the traceback table at the end of the function.
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108 extern "C" int getFuncName(
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109 codeptr_t pc, // [in] program counter
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110 char* p_name, size_t namelen, // [out] optional: function name ("" if not available)
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111 int* p_displacement, // [out] optional: displacement (-1 if not available)
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112 const struct tbtable** p_tb, // [out] optional: ptr to traceback table to get further
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113 // information (NULL if not available)
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114 char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages
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115 ) {
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116 struct tbtable* tb = 0;
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117 unsigned int searchcount = 0;
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118
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119 // initialize output parameters
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120 if (p_name && namelen > 0) {
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121 *p_name = '\0';
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122 }
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123 if (p_errmsg && errmsglen > 0) {
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124 *p_errmsg = '\0';
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125 }
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126 if (p_displacement) {
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127 *p_displacement = -1;
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128 }
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129 if (p_tb) {
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130 *p_tb = NULL;
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131 }
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132
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133 // weed out obvious bogus states
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134 if (pc < MINIMUM_VALUE_FOR_PC) {
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135 ERRBYE("invalid program counter");
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136 }
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137
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138 codeptr_t pc2 = pc;
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139
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140 // make sure the pointer is word aligned.
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141 pc2 = (codeptr_t) align_ptr_up((char*)pc2, 4);
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142
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143 // Find start of traceback table.
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144 // (starts after code, is marked by word-aligned (32bit) zeros)
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145 while ((*pc2 != NULL) && (searchcount++ < MAX_FUNC_SEARCH_LEN)) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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146 pc2++;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
147 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
148 if (*pc2 != 0) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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149 ERRBYE("could not find traceback table within 5000 bytes of program counter");
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
150 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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151 //
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
152 // Set up addressability to the traceback table
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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153 //
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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154 tb = (struct tbtable*) (pc2 + 1);
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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155
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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156 // Is this really a traceback table? No way to be sure but
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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157 // some indicators we can check.
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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158 if (tb->tb.lang >= 0xf && tb->tb.lang <= 0xfb) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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159 // Language specifiers, go from 0 (C) to 14 (Objective C).
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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160 // According to spec, 0xf-0xfa reserved, 0xfb-0xff reserved for ibm.
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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161 ERRBYE("not a traceback table");
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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162 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
163
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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164 // Existence of fields in the tbtable extension are contingent upon
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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165 // specific fields in the base table. Check for their existence so
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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166 // that we can address the function name if it exists.
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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167 pc2 = (codeptr_t) tb +
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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168 sizeof(struct tbtable_short)/sizeof(int);
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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169 if (tb->tb.fixedparms != 0 || tb->tb.floatparms != 0)
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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170 pc2++;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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171
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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172 if (tb->tb.has_tboff == TRUE) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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173
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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174 // I want to know the displacement
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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175 const unsigned int tb_offset = *pc2;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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176 codeptr_t start_of_procedure =
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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177 (codeptr_t)(((char*)tb) - 4 - tb_offset); // (-4 to omit leading 0000)
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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178
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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179 // Weed out the cases where we did find the wrong traceback table.
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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180 if (pc < start_of_procedure) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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181 ERRBYE("could not find (the real) traceback table within 5000 bytes of program counter");
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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182 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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183
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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184 // return the displacement
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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185 if (p_displacement) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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186 (*p_displacement) = (int) PTRDIFF_BYTES(pc, start_of_procedure);
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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187 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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188
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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189 pc2++;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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190 } else {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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191 // return -1 for displacement
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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192 if (p_displacement) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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193 (*p_displacement) = -1;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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194 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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195 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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196
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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197 if (tb->tb.int_hndl == TRUE)
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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198 pc2++;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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199
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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200 if (tb->tb.has_ctl == TRUE)
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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201 pc2 += (*pc2) + 1; // don't care
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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202
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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203 //
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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204 // return function name if it exists.
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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205 //
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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206 if (p_name && namelen > 0) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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207 if (tb->tb.name_present) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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208 char buf[256];
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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209 const short l = MIN2<short>(*((short*)pc2), sizeof(buf) - 1);
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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210 memcpy(buf, (char*)pc2 + sizeof(short), l);
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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211 buf[l] = '\0';
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
212
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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213 p_name[0] = '\0';
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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214
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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215 // If it is a C++ name, try and demangle it using the Demangle interface (see demangle.h).
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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216 char* rest;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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217 Name* const name = Demangle(buf, rest);
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
218 if (name) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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219 const char* const demangled_name = name->Text();
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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220 if (demangled_name) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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221 strncpy(p_name, demangled_name, namelen-1);
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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222 p_name[namelen-1] = '\0';
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
223 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
224 delete name;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
225 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
226
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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227 // Fallback: if demangling did not work, just provide the unmangled name.
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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228 if (p_name[0] == '\0') {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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229 strncpy(p_name, buf, namelen-1);
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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230 p_name[namelen-1] = '\0';
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
231 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
232
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
233 } else {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
234 strncpy(p_name, "<nameless function>", namelen-1);
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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235 p_name[namelen-1] = '\0';
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
236 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
237 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
238 // Return traceback table, if user wants it.
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
239 if (p_tb) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
240 (*p_tb) = tb;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
241 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
242
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
243 return 0;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
244 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
245
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
246 // Special implementation of dladdr for Aix based on LoadedLibraries
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
247 // Note: dladdr returns non-zero for ok, 0 for error!
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
248 // Note: dladdr is not posix, but a non-standard GNU extension. So this tries to
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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249 // fulfill the contract of dladdr on Linux (see http://linux.die.net/man/3/dladdr)
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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250 // Note: addr may be both an AIX function descriptor or a real code pointer
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
251 // to the entry of a function.
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
252 extern "C"
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
253 int dladdr(void* addr, Dl_info* info) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
254
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
255 if (!addr) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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parents:
diff changeset
256 return 0;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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parents:
diff changeset
257 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
258
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
259 assert(info, "");
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
260
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
261 int rc = 0;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
262
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
263 const char* const ZEROSTRING = "";
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
264
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
265 // Always return a string, even if a "" one. Linux dladdr manpage
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
266 // does not say anything about returning NULL
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
267 info->dli_fname = ZEROSTRING;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
268 info->dli_sname = ZEROSTRING;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
269 info->dli_saddr = NULL;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
270
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
271 address p = (address) addr;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
272 const LoadedLibraryModule* lib = NULL;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
273
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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274 enum { noclue, code, data } type = noclue;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
275
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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276 trcVerbose("dladdr(%p)...", p);
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
277
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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278 // Note: input address may be a function. I accept both a pointer to
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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279 // the entry of a function and a pointer to the function decriptor.
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
280 // (see ppc64 ABI)
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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281 lib = LoadedLibraries::find_for_text_address(p);
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
282 if (lib) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
283 type = code;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
284 }
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
285
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
286 if (!lib) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
287 // Not a pointer into any text segment. Is it a function descriptor?
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
288 const FunctionDescriptor* const pfd = (const FunctionDescriptor*) p;
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
289 p = pfd->entry();
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
290 if (p) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
291 lib = LoadedLibraries::find_for_text_address(p);
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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diff changeset
292 if (lib) {
666e6ce3976c 8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
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293 type = code;
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294 }
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295 }
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296 }
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297
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298 if (!lib) {
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299 // Neither direct code pointer nor function descriptor. A data ptr?
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300 p = (address)addr;
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301 lib = LoadedLibraries::find_for_data_address(p);
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302 if (lib) {
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303 type = data;
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304 }
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305 }
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306
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307 // If we did find the shared library this address belongs to (either
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308 // code or data segment) resolve library path and, if possible, the
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309 // symbol name.
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310 if (lib) {
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311 const char* const interned_libpath =
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312 dladdr_fixed_strings.intern(lib->get_fullpath());
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313 if (interned_libpath) {
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314 info->dli_fname = interned_libpath;
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315 }
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316
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317 if (type == code) {
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318
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319 // For code symbols resolve function name and displacement. Use
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320 // displacement to calc start of function.
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321 char funcname[256] = "";
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322 int displacement = 0;
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323
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324 if (getFuncName((codeptr_t) p, funcname, sizeof(funcname), &displacement,
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325 NULL, NULL, 0) == 0) {
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326 if (funcname[0] != '\0') {
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327 const char* const interned = dladdr_fixed_strings.intern(funcname);
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328 info->dli_sname = interned;
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329 trcVerbose("... function name: %s ...", interned);
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330 }
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331
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332 // From the displacement calculate the start of the function.
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333 if (displacement != -1) {
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334 info->dli_saddr = p - displacement;
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335 } else {
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336 info->dli_saddr = p;
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337 }
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338 } else {
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339
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340 // No traceback table found. Just assume the pointer is it.
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341 info->dli_saddr = p;
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342
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343 }
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344
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345 } else if (type == data) {
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346
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347 // For data symbols.
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348 info->dli_saddr = p;
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349
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350 } else {
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351 ShouldNotReachHere();
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352 }
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353
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354 rc = 1; // success: return 1 [sic]
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355
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356 }
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357
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358 // sanity checks.
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359 if (rc) {
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360 assert(info->dli_fname, "");
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361 assert(info->dli_sname, "");
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362 assert(info->dli_saddr, "");
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363 }
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364
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365 return rc; // error: return 0 [sic]
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366
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367 }