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annotate src/share/tools/hsdis/hsdis-demo.c @ 100:c7c777385a15

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6667042: PrintAssembly option does not work without special plugin Summary: remove old private plugin interface, simplify, rework old plugin to use unchanged Gnu sources Reviewed-by: kvn, rasbold
author jrose
date Wed, 02 Apr 2008 12:09:59 -0700
parents
children 67a2f5ba5582
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100
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1 /*
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2 * Copyright 2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 /* hsdis-demo.c -- dump a range of addresses as native instructions
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26 This demonstrates the protocol required by the HotSpot PrintAssembly option.
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27 */
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28
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29 #include "hsdis.h"
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30
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31 #include "stdio.h"
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32 #include "stdlib.h"
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33 #include "string.h"
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34
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35 void greet(const char*);
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36 void disassemble(void*, void*);
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37 void end_of_file();
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38
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39 const char* options = NULL;
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40 int raw = 0;
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41 int xml = 0;
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42
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43 int main(int ac, char** av) {
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44 int greeted = 0;
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45 int i;
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46 for (i = 1; i < ac; i++) {
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47 const char* arg = av[i];
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48 if (arg[0] == '-') {
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49 if (!strcmp(arg, "-xml"))
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50 xml ^= 1;
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51 else if (!strcmp(arg, "-raw"))
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52 raw ^= 1;
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53 else if (!strncmp(arg, "-options=", 9))
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54 options = arg+9;
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55 else
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56 { printf("Usage: %s [-xml] [name...]\n"); exit(2); }
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57 continue;
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58 }
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59 greet(arg);
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60 greeted = 1;
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61 }
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62 if (!greeted)
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63 greet("world");
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64 printf("...And now for something completely different:\n");
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65 disassemble((void*) &main, (void*) &end_of_file);
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66 printf("Cheers!\n");
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67 }
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68
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69 void greet(const char* whom) {
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70 printf("Hello, %s!\n", whom);
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71 }
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72
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73 void end_of_file() { }
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74
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75 /* don't disassemble after this point... */
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76
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77 #include "dlfcn.h"
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78
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79 #ifdef HOTSPOT_LIB_ARCH
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80 #define LIBARCH HOTSPOT_LIB_ARCH
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81 #endif
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82 #ifdef HOTSPOT_OS
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83 #define OS HOTSPOT_OS
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84 #endif
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85
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86 #define DECODE_INSTRUCTIONS_NAME "decode_instructions"
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87 #define HSDIS_NAME "hsdis"
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88 static void* decode_instructions_pv = 0;
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89 static const char* hsdis_path[] = {
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90 HSDIS_NAME".so",
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91 #ifdef OS
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92 "bin/"OS"/"HSDIS_NAME".so",
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93 #endif
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94 #ifdef LIBARCH
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95 HSDIS_NAME"-"LIBARCH".so",
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96 #ifdef OS
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97 "bin/"OS"/"HSDIS_NAME"-"LIBARCH".so",
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98 #endif
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99 #endif
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100 NULL
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101 };
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102
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103 static const char* load_decode_instructions() {
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104 void* dllib = NULL;
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105 const char* *next_in_path = hsdis_path;
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106 while (1) {
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107 decode_instructions_pv = dlsym(dllib, DECODE_INSTRUCTIONS_NAME);
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108 if (decode_instructions_pv != NULL)
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109 return NULL;
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110 if (dllib != NULL)
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111 return "plugin does not defined "DECODE_INSTRUCTIONS_NAME;
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112 for (dllib = NULL; dllib == NULL; ) {
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113 const char* next_lib = (*next_in_path++);
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114 if (next_lib == NULL)
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115 return "cannot find plugin "HSDIS_NAME".so";
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116 dllib = dlopen(next_lib, RTLD_LAZY);
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117 }
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118 }
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119 }
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120
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121
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122 static const char* lookup(void* addr) {
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123 #define CHECK_NAME(fn) \
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124 if (addr == (void*) &fn) return #fn;
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125
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126 CHECK_NAME(main);
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127 CHECK_NAME(greet);
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128 return NULL;
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129 }
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130
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131 /* does the event match the tag, followed by a null, space, or slash? */
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132 #define MATCH(event, tag) \
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133 (!strncmp(event, tag, sizeof(tag)-1) && \
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134 (!event[sizeof(tag)-1] || strchr(" /", event[sizeof(tag)-1])))
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135
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136
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137 static const char event_cookie[] = "event_cookie"; /* demo placeholder */
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138 static void* handle_event(void* cookie, const char* event, void* arg) {
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139 #define NS_DEMO "demo:"
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140 if (cookie != event_cookie)
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141 printf("*** bad event cookie %p != %p\n", cookie, event_cookie);
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142
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143 if (xml) {
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144 /* We could almost do a printf(event, arg),
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145 but for the sake of a better demo,
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146 we dress the result up as valid XML.
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147 */
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148 const char* fmt = strchr(event, ' ');
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149 int evlen = (fmt ? fmt - event : strlen(event));
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150 if (!fmt) {
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151 if (event[0] != '/') {
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152 printf("<"NS_DEMO"%.*s>", evlen, event);
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153 } else {
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154 printf("</"NS_DEMO"%.*s>", evlen-1, event+1);
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155 }
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156 } else {
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157 if (event[0] != '/') {
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158 printf("<"NS_DEMO"%.*s", evlen, event);
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159 printf(fmt, arg);
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160 printf(">");
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161 } else {
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162 printf("<"NS_DEMO"%.*s_done", evlen-1, event+1);
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163 printf(fmt, arg);
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164 printf("/></"NS_DEMO"%.*s>", evlen-1, event+1);
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165 }
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166 }
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167 }
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168
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169 if (MATCH(event, "insn")) {
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170 const char* name = lookup(arg);
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171 if (name) printf("%s:\n", name);
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172
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173 /* basic action for <insn>: */
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174 printf(" %p\t", arg);
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175
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176 } else if (MATCH(event, "/insn")) {
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177 /* basic action for </insn>:
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178 (none, plugin puts the newline for us
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179 */
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180
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181 } else if (MATCH(event, "mach")) {
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182 printf("Decoding for CPU '%s'\n", (char*) arg);
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183
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184 } else if (MATCH(event, "addr")) {
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185 /* basic action for <addr/>: */
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186 const char* name = lookup(arg);
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187 if (name) {
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188 printf("&%s (%p)", name, arg);
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189 /* return non-null to notify hsdis not to print the addr */
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190 return arg;
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191 }
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192 }
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193
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194 /* null return is always safe; can mean "I ignored it" */
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195 return NULL;
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196 }
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197
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198 #define fprintf_callback \
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199 (decode_instructions_printf_callback_ftype)&fprintf
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200
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201 void disassemble(void* from, void* to) {
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202 const char* err = load_decode_instructions();
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203 if (err != NULL) {
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204 printf("%s: %s\n", err, dlerror());
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205 exit(1);
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206 }
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207 printf("Decoding from %p to %p...\n", from, to);
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208 decode_instructions_ftype decode_instructions
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209 = (decode_instructions_ftype) decode_instructions_pv;
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210 void* res;
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211 if (raw && xml) {
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212 res = (*decode_instructions)(from, to, NULL, stdout, NULL, stdout, options);
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213 } else if (raw) {
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214 res = (*decode_instructions)(from, to, NULL, NULL, NULL, stdout, options);
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215 } else {
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216 res = (*decode_instructions)(from, to,
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217 handle_event, (void*) event_cookie,
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218 fprintf_callback, stdout,
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219 options);
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220 }
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221 if (res != to)
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222 printf("*** Result was %p!\n", res);
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223 }