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1 /* |
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2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. 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 <stdio.h> |
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26 #include <stdlib.h> |
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27 #include <string.h> |
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28 #include <errno.h> |
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29 #include <gelf.h> |
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30 |
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31 #include "libjvm_db.h" |
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32 #include "JvmOffsets.h" |
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33 |
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34 #define LIBJVM_SO "libjvm.so" |
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35 |
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36 #if defined(i386) || defined(__i386) || defined(__amd64) |
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37 #ifdef COMPILER2 |
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38 #define X86_COMPILER2 |
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39 #endif /* COMPILER2 */ |
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40 #endif /* i386 */ |
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41 |
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42 typedef struct { |
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43 short vf_cnt; /* number of recognized java vframes */ |
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44 short bci; /* current frame method byte code index */ |
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45 int line; /* current frame method source line */ |
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46 uint64_t new_fp; /* fp for the next frame */ |
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47 uint64_t new_pc; /* pc for the next frame */ |
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48 uint64_t new_sp; /* "raw" sp for the next frame (includes extension by interpreter/adapter */ |
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49 char locinf; /* indicates there is valid location info */ |
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50 } Jframe_t; |
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51 |
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52 int Jlookup_by_regs(jvm_agent_t* J, const prgregset_t regs, char *name, |
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53 size_t size, Jframe_t *jframe); |
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54 |
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55 int main(int arg) { return arg; } |
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56 |
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57 static int debug = 0; |
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58 |
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59 static void failed(int err, const char * file, int line) { |
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60 if (debug) { |
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61 fprintf(stderr, "failed %d at %s:%d\n", err, file, line); |
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62 } |
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63 } |
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64 |
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65 static void warn(const char * file, int line, const char * msg) { |
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66 if (debug) { |
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67 fprintf(stderr, "warning: %s at %s:%d\n", msg, file, line); |
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68 } |
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69 } |
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70 |
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71 static void warn1(const char * file, int line, const char * msg, intptr_t arg1) { |
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72 if (debug) { |
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73 fprintf(stderr, "warning: "); |
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74 fprintf(stderr, msg, arg1); |
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75 fprintf(stderr, " at %s:%d\n", file, line); |
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76 } |
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77 } |
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78 |
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79 #define CHECK_FAIL(err) \ |
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80 if (err != PS_OK) { failed(err, __FILE__, __LINE__); goto fail; } |
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81 #define WARN(msg) warn(__FILE__, __LINE__, msg) |
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82 #define WARN1(msg, arg1) warn1(__FILE__, __LINE__, msg, arg1) |
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83 |
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84 typedef struct VMStructEntry { |
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85 const char * typeName; /* The type name containing the given field (example: "Klass") */ |
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86 const char * fieldName; /* The field name within the type (example: "_name") */ |
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87 uint64_t address; /* Address of field; only used for static fields */ |
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88 /* ("offset" can not be reused because of apparent SparcWorks compiler bug */ |
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89 /* in generation of initializer data) */ |
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90 } VMStructEntry; |
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91 |
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92 /* Prototyping inlined methods */ |
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93 |
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94 int sprintf(char *s, const char *format, ...); |
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95 |
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96 #define SZ16 sizeof(int16_t) |
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97 #define SZ32 sizeof(int32_t) |
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98 |
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99 #define COMP_METHOD_SIGN '*' |
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100 |
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101 #define MAX_VFRAMES_CNT 256 |
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102 |
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103 typedef struct vframe { |
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104 uint64_t method; |
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105 int32_t sender_decode_offset; |
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106 int32_t methodIdx; |
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107 int32_t bci; |
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108 int32_t line; |
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109 } Vframe_t; |
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110 |
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111 typedef struct frame { |
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112 uintptr_t fp; |
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113 uintptr_t pc; |
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114 uintptr_t sp; |
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115 uintptr_t sender_sp; // The unextended sp of the caller |
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116 } Frame_t; |
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117 |
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118 typedef struct Nmethod_t { |
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119 struct jvm_agent* J; |
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120 Jframe_t *jframe; |
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121 |
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122 uint64_t nm; /* _nmethod */ |
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123 uint64_t pc; |
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124 uint64_t pc_desc; |
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125 |
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126 int32_t orig_pc_offset; /* _orig_pc_offset */ |
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127 int32_t instrs_beg; /* _code_offset */ |
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128 int32_t instrs_end; |
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129 int32_t deopt_beg; /* _deoptimize_offset */ |
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130 int32_t scopes_data_beg; /* _scopes_data_offset */ |
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131 int32_t scopes_data_end; |
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132 int32_t metadata_beg; /* _metadata_offset */ |
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133 int32_t metadata_end; |
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134 int32_t scopes_pcs_beg; /* _scopes_pcs_offset */ |
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135 int32_t scopes_pcs_end; |
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136 |
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137 int vf_cnt; |
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138 Vframe_t vframes[MAX_VFRAMES_CNT]; |
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139 } Nmethod_t; |
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140 |
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141 struct jvm_agent { |
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142 struct ps_prochandle* P; |
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143 |
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144 uint64_t nmethod_vtbl; |
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145 uint64_t CodeBlob_vtbl; |
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146 uint64_t BufferBlob_vtbl; |
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147 uint64_t RuntimeStub_vtbl; |
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148 uint64_t Method_vtbl; |
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149 |
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150 uint64_t Use_Compressed_Oops_address; |
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151 uint64_t Universe_narrow_oop_base_address; |
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152 uint64_t Universe_narrow_oop_shift_address; |
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153 uint64_t CodeCache_heap_address; |
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154 |
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155 /* Volatiles */ |
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156 uint8_t Use_Compressed_Oops; |
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157 uint64_t Universe_narrow_oop_base; |
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158 uint32_t Universe_narrow_oop_shift; |
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159 uint64_t CodeCache_low; |
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160 uint64_t CodeCache_high; |
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161 uint64_t CodeCache_segmap_low; |
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162 uint64_t CodeCache_segmap_high; |
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163 |
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164 int32_t SIZE_CodeCache_log2_segment; |
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165 |
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166 uint64_t methodPtr; |
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167 uint64_t bcx; |
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168 |
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169 Nmethod_t *N; /*Inlined methods support */ |
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170 Frame_t prev_fr; |
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171 Frame_t curr_fr; |
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172 }; |
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173 |
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174 static int |
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175 read_string(struct ps_prochandle *P, |
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176 char *buf, /* caller's buffer */ |
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177 size_t size, /* upper limit on bytes to read */ |
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178 uintptr_t addr) /* address in process */ |
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179 { |
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180 int err = PS_OK; |
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181 while (size-- > 1 && err == PS_OK) { |
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182 err = ps_pread(P, addr, buf, 1); |
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183 if (*buf == '\0') { |
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184 return PS_OK; |
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185 } |
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186 addr += 1; |
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187 buf += 1; |
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188 } |
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189 return -1; |
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190 } |
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191 |
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192 static int read_compressed_pointer(jvm_agent_t* J, uint64_t base, uint32_t *ptr) { |
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193 int err = -1; |
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194 uint32_t ptr32; |
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195 err = ps_pread(J->P, base, &ptr32, sizeof(uint32_t)); |
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196 *ptr = ptr32; |
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197 return err; |
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198 } |
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199 |
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200 static int read_pointer(jvm_agent_t* J, uint64_t base, uint64_t* ptr) { |
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201 int err = -1; |
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202 uint32_t ptr32; |
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203 |
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204 switch (DATA_MODEL) { |
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205 case PR_MODEL_LP64: |
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206 err = ps_pread(J->P, base, ptr, sizeof(uint64_t)); |
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207 break; |
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208 case PR_MODEL_ILP32: |
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209 err = ps_pread(J->P, base, &ptr32, sizeof(uint32_t)); |
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210 *ptr = ptr32; |
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211 break; |
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212 } |
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213 |
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214 return err; |
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215 } |
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216 |
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217 static int read_string_pointer(jvm_agent_t* J, uint64_t base, const char ** stringp) { |
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218 uint64_t ptr; |
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219 int err; |
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220 char buffer[1024]; |
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221 |
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222 *stringp = NULL; |
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223 err = read_pointer(J, base, &ptr); |
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224 CHECK_FAIL(err); |
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225 if (ptr != 0) { |
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226 err = read_string(J->P, buffer, sizeof(buffer), ptr); |
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227 CHECK_FAIL(err); |
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228 *stringp = strdup(buffer); |
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229 } |
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230 return PS_OK; |
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231 |
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232 fail: |
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233 return err; |
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234 } |
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235 |
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236 static int parse_vmstruct_entry(jvm_agent_t* J, uint64_t base, VMStructEntry* vmp) { |
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237 uint64_t ptr; |
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238 int err; |
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239 |
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240 err = read_string_pointer(J, base + OFFSET_VMStructEntrytypeName, &vmp->typeName); |
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241 CHECK_FAIL(err); |
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242 err = read_string_pointer(J, base + OFFSET_VMStructEntryfieldName, &vmp->fieldName); |
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243 CHECK_FAIL(err); |
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244 err = read_pointer(J, base + OFFSET_VMStructEntryaddress, &vmp->address); |
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245 CHECK_FAIL(err); |
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246 |
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247 return PS_OK; |
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248 |
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249 fail: |
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250 if (vmp->typeName != NULL) free((void*)vmp->typeName); |
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251 if (vmp->fieldName != NULL) free((void*)vmp->fieldName); |
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252 return err; |
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253 } |
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254 |
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255 static int parse_vmstructs(jvm_agent_t* J) { |
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256 VMStructEntry vmVar; |
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257 VMStructEntry* vmp = &vmVar; |
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258 uint64_t gHotSpotVMStructs; |
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259 psaddr_t sym_addr; |
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260 uint64_t base; |
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261 int err; |
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262 |
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263 err = ps_pglobal_lookup(J->P, LIBJVM_SO, "gHotSpotVMStructs", &sym_addr); |
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264 CHECK_FAIL(err); |
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265 err = read_pointer(J, sym_addr, &gHotSpotVMStructs); |
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266 CHECK_FAIL(err); |
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267 base = gHotSpotVMStructs; |
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268 |
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269 err = PS_OK; |
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270 while (err == PS_OK) { |
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271 memset(vmp, 0, sizeof(VMStructEntry)); |
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272 err = parse_vmstruct_entry(J, base, vmp); |
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273 if (err != PS_OK || vmp->typeName == NULL) { |
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274 break; |
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275 } |
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276 |
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277 if (vmp->typeName[0] == 'C' && strcmp("CodeCache", vmp->typeName) == 0) { |
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278 if (strcmp("_heap", vmp->fieldName) == 0) { |
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279 err = read_pointer(J, vmp->address, &J->CodeCache_heap_address); |
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280 } |
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281 } else if (vmp->typeName[0] == 'U' && strcmp("Universe", vmp->typeName) == 0) { |
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282 if (strcmp("_narrow_oop._base", vmp->fieldName) == 0) { |
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283 J->Universe_narrow_oop_base_address = vmp->address; |
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284 } |
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285 if (strcmp("_narrow_oop._shift", vmp->fieldName) == 0) { |
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286 J->Universe_narrow_oop_shift_address = vmp->address; |
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287 } |
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288 } |
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289 CHECK_FAIL(err); |
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290 |
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291 base += SIZE_VMStructEntry; |
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292 if (vmp->typeName != NULL) free((void*)vmp->typeName); |
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293 if (vmp->fieldName != NULL) free((void*)vmp->fieldName); |
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294 } |
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295 |
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296 return PS_OK; |
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297 |
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298 fail: |
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299 if (vmp->typeName != NULL) free((void*)vmp->typeName); |
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300 if (vmp->fieldName != NULL) free((void*)vmp->fieldName); |
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301 return -1; |
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302 } |
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303 |
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304 static int find_symbol(jvm_agent_t* J, const char *name, uint64_t* valuep) { |
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305 psaddr_t sym_addr; |
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306 int err; |
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307 |
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308 err = ps_pglobal_lookup(J->P, LIBJVM_SO, name, &sym_addr); |
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309 if (err != PS_OK) goto fail; |
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310 *valuep = sym_addr; |
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311 return PS_OK; |
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312 |
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313 fail: |
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314 return err; |
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315 } |
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316 |
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317 static int read_volatiles(jvm_agent_t* J) { |
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318 uint64_t ptr; |
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319 int err; |
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320 |
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321 err = find_symbol(J, "UseCompressedOops", &J->Use_Compressed_Oops_address); |
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322 if (err == PS_OK) { |
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323 err = ps_pread(J->P, J->Use_Compressed_Oops_address, &J->Use_Compressed_Oops, sizeof(uint8_t)); |
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324 CHECK_FAIL(err); |
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325 } else { |
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326 J->Use_Compressed_Oops = 0; |
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327 } |
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328 |
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329 err = read_pointer(J, J->Universe_narrow_oop_base_address, &J->Universe_narrow_oop_base); |
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330 CHECK_FAIL(err); |
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331 err = ps_pread(J->P, J->Universe_narrow_oop_shift_address, &J->Universe_narrow_oop_shift, sizeof(uint32_t)); |
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332 CHECK_FAIL(err); |
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333 |
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334 err = read_pointer(J, J->CodeCache_heap_address + OFFSET_CodeHeap_memory + |
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335 OFFSET_VirtualSpace_low, &J->CodeCache_low); |
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336 CHECK_FAIL(err); |
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337 err = read_pointer(J, J->CodeCache_heap_address + OFFSET_CodeHeap_memory + |
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338 OFFSET_VirtualSpace_high, &J->CodeCache_high); |
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339 CHECK_FAIL(err); |
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340 err = read_pointer(J, J->CodeCache_heap_address + OFFSET_CodeHeap_segmap + |
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341 OFFSET_VirtualSpace_low, &J->CodeCache_segmap_low); |
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342 CHECK_FAIL(err); |
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343 err = read_pointer(J, J->CodeCache_heap_address + OFFSET_CodeHeap_segmap + |
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344 OFFSET_VirtualSpace_high, &J->CodeCache_segmap_high); |
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345 CHECK_FAIL(err); |
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346 |
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347 err = ps_pread(J->P, J->CodeCache_heap_address + OFFSET_CodeHeap_log2_segment_size, |
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348 &J->SIZE_CodeCache_log2_segment, sizeof(J->SIZE_CodeCache_log2_segment)); |
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349 CHECK_FAIL(err); |
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350 |
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351 return PS_OK; |
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352 |
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353 fail: |
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354 return err; |
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355 } |
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356 |
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357 |
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358 static int codecache_contains(jvm_agent_t* J, uint64_t ptr) { |
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359 /* make sure the code cache is up to date */ |
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360 return (J->CodeCache_low <= ptr && ptr < J->CodeCache_high); |
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361 } |
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362 |
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363 static uint64_t segment_for(jvm_agent_t* J, uint64_t p) { |
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364 return (p - J->CodeCache_low) >> J->SIZE_CodeCache_log2_segment; |
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365 } |
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366 |
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367 static uint64_t block_at(jvm_agent_t* J, int i) { |
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368 return J->CodeCache_low + (i << J->SIZE_CodeCache_log2_segment); |
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369 } |
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370 |
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371 static int find_start(jvm_agent_t* J, uint64_t ptr, uint64_t *startp) { |
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372 int err; |
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373 |
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374 *startp = 0; |
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375 if (J->CodeCache_low <= ptr && ptr < J->CodeCache_high) { |
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376 int32_t used; |
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377 uint64_t segment = segment_for(J, ptr); |
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378 uint64_t block = J->CodeCache_segmap_low; |
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379 uint8_t tag; |
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380 err = ps_pread(J->P, block + segment, &tag, sizeof(tag)); |
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381 CHECK_FAIL(err); |
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382 if (tag == 0xff) |
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383 return PS_OK; |
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384 while (tag > 0) { |
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385 err = ps_pread(J->P, block + segment, &tag, sizeof(tag)); |
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386 CHECK_FAIL(err); |
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387 segment -= tag; |
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388 } |
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389 block = block_at(J, segment); |
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390 err = ps_pread(J->P, block + OFFSET_HeapBlockHeader_used, &used, sizeof(used)); |
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391 CHECK_FAIL(err); |
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392 if (used) { |
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393 *startp = block + SIZE_HeapBlockHeader; |
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394 } |
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395 } |
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396 return PS_OK; |
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397 |
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398 fail: |
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399 return -1; |
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400 } |
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401 |
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402 static int find_jlong_constant(jvm_agent_t* J, const char *name, uint64_t* valuep) { |
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403 psaddr_t sym_addr; |
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404 int err = ps_pglobal_lookup(J->P, LIBJVM_SO, name, &sym_addr); |
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405 if (err == PS_OK) { |
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406 err = ps_pread(J->P, sym_addr, valuep, sizeof(uint64_t)); |
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407 return err; |
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408 } |
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409 *valuep = -1; |
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410 return -1; |
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411 } |
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412 |
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413 jvm_agent_t *Jagent_create(struct ps_prochandle *P, int vers) { |
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414 jvm_agent_t* J; |
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415 int err; |
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416 |
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417 if (vers != JVM_DB_VERSION) { |
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418 errno = ENOTSUP; |
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419 return NULL; |
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420 } |
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421 |
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422 J = (jvm_agent_t*)calloc(sizeof(struct jvm_agent), 1); |
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423 |
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424 debug = getenv("LIBJVMDB_DEBUG") != NULL; |
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425 if (debug) debug = 3; |
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426 |
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427 if (debug) { |
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428 fprintf(stderr, "Jagent_create: debug=%d\n", debug); |
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429 #ifdef X86_COMPILER2 |
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430 fprintf(stderr, "Jagent_create: R_SP=%d, R_FP=%d, POINTER_SIZE=%d\n", R_SP, R_FP, POINTER_SIZE); |
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431 #endif /* X86_COMPILER2 */ |
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432 } |
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433 |
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434 J->P = P; |
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435 |
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436 // Initialize the initial previous frame |
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437 |
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438 J->prev_fr.fp = 0; |
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439 J->prev_fr.pc = 0; |
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440 J->prev_fr.sp = 0; |
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441 J->prev_fr.sender_sp = 0; |
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442 |
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443 err = find_symbol(J, "__1cHnmethodG__vtbl_", &J->nmethod_vtbl); |
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444 CHECK_FAIL(err); |
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445 err = find_symbol(J, "__1cKBufferBlobG__vtbl_", &J->BufferBlob_vtbl); |
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446 if (err != PS_OK) J->BufferBlob_vtbl = 0; |
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447 err = find_symbol(J, "__1cICodeBlobG__vtbl_", &J->CodeBlob_vtbl); |
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448 CHECK_FAIL(err); |
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449 err = find_symbol(J, "__1cLRuntimeStubG__vtbl_", &J->RuntimeStub_vtbl); |
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450 CHECK_FAIL(err); |
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451 err = find_symbol(J, "__1cGMethodG__vtbl_", &J->Method_vtbl); |
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452 CHECK_FAIL(err); |
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453 |
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454 err = parse_vmstructs(J); |
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455 CHECK_FAIL(err); |
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456 err = read_volatiles(J); |
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457 CHECK_FAIL(err); |
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458 |
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459 return J; |
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460 |
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461 fail: |
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462 Jagent_destroy(J); |
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463 return NULL; |
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464 } |
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465 |
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466 void Jagent_destroy(jvm_agent_t *J) { |
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467 if (J != NULL) { |
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468 free(J); |
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469 } |
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470 } |
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471 |
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472 static int is_method(jvm_agent_t* J, uint64_t methodPtr) { |
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473 uint64_t klass; |
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474 int err = read_pointer(J, methodPtr, &klass); |
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475 if (err != PS_OK) goto fail; |
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476 return klass == J->Method_vtbl; |
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477 |
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478 fail: |
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479 return 0; |
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480 } |
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481 |
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482 static int |
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483 name_for_methodPtr(jvm_agent_t* J, uint64_t methodPtr, char * result, size_t size) |
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484 { |
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485 short nameIndex; |
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486 short signatureIndex; |
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487 uint64_t constantPool; |
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488 uint64_t constMethod; |
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489 uint64_t nameSymbol; |
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490 uint64_t signatureSymbol; |
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491 uint64_t klassPtr; |
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492 uint64_t klassSymbol; |
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493 short klassSymbolLength; |
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494 short nameSymbolLength; |
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495 short signatureSymbolLength; |
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496 char * nameString = NULL; |
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497 char * klassString = NULL; |
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498 char * signatureString = NULL; |
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499 int err; |
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500 |
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501 err = read_pointer(J, methodPtr + OFFSET_Method_constMethod, &constMethod); |
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502 CHECK_FAIL(err); |
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503 err = read_pointer(J, constMethod + OFFSET_ConstMethod_constants, &constantPool); |
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504 CHECK_FAIL(err); |
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505 |
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506 /* To get name string */ |
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507 err = ps_pread(J->P, constMethod + OFFSET_ConstMethod_name_index, &nameIndex, 2); |
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508 CHECK_FAIL(err); |
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509 err = read_pointer(J, constantPool + nameIndex * POINTER_SIZE + SIZE_ConstantPool, &nameSymbol); |
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510 CHECK_FAIL(err); |
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511 // The symbol is a CPSlot and has lower bit set to indicate metadata |
|
512 nameSymbol &= (~1); // remove metadata lsb |
|
513 err = ps_pread(J->P, nameSymbol + OFFSET_Symbol_length, &nameSymbolLength, 2); |
|
514 CHECK_FAIL(err); |
|
515 nameString = (char*)calloc(nameSymbolLength + 1, 1); |
|
516 err = ps_pread(J->P, nameSymbol + OFFSET_Symbol_body, nameString, nameSymbolLength); |
|
517 CHECK_FAIL(err); |
|
518 |
|
519 /* To get signature string */ |
|
520 err = ps_pread(J->P, constMethod + OFFSET_ConstMethod_signature_index, &signatureIndex, 2); |
|
521 CHECK_FAIL(err); |
|
522 err = read_pointer(J, constantPool + signatureIndex * POINTER_SIZE + SIZE_ConstantPool, &signatureSymbol); |
|
523 CHECK_FAIL(err); |
|
524 signatureSymbol &= (~1); // remove metadata lsb |
|
525 err = ps_pread(J->P, signatureSymbol + OFFSET_Symbol_length, &signatureSymbolLength, 2); |
|
526 CHECK_FAIL(err); |
|
527 signatureString = (char*)calloc(signatureSymbolLength + 1, 1); |
|
528 err = ps_pread(J->P, signatureSymbol + OFFSET_Symbol_body, signatureString, signatureSymbolLength); |
|
529 CHECK_FAIL(err); |
|
530 |
|
531 /* To get klass string */ |
|
532 err = read_pointer(J, constantPool + OFFSET_ConstantPool_pool_holder, &klassPtr); |
|
533 CHECK_FAIL(err); |
|
534 err = read_pointer(J, klassPtr + OFFSET_Klass_name, &klassSymbol); |
|
535 CHECK_FAIL(err); |
|
536 err = ps_pread(J->P, klassSymbol + OFFSET_Symbol_length, &klassSymbolLength, 2); |
|
537 CHECK_FAIL(err); |
|
538 klassString = (char*)calloc(klassSymbolLength + 1, 1); |
|
539 err = ps_pread(J->P, klassSymbol + OFFSET_Symbol_body, klassString, klassSymbolLength); |
|
540 CHECK_FAIL(err); |
|
541 |
|
542 result[0] = '\0'; |
|
543 strncat(result, klassString, size); |
|
544 size -= strlen(klassString); |
|
545 strncat(result, ".", size); |
|
546 size -= 1; |
|
547 strncat(result, nameString, size); |
|
548 size -= strlen(nameString); |
|
549 strncat(result, signatureString, size); |
|
550 |
|
551 if (nameString != NULL) free(nameString); |
|
552 if (klassString != NULL) free(klassString); |
|
553 if (signatureString != NULL) free(signatureString); |
|
554 |
|
555 return PS_OK; |
|
556 |
|
557 fail: |
|
558 if (debug) { |
|
559 fprintf(stderr, "name_for_methodPtr: FAIL \n\n"); |
|
560 } |
|
561 if (nameString != NULL) free(nameString); |
|
562 if (klassString != NULL) free(klassString); |
|
563 if (signatureString != NULL) free(signatureString); |
|
564 return -1; |
|
565 } |
|
566 |
|
567 static int nmethod_info(Nmethod_t *N) |
|
568 { |
|
569 jvm_agent_t *J = N->J; |
|
570 uint64_t nm = N->nm; |
|
571 int32_t err; |
|
572 |
|
573 if (debug > 2 ) |
|
574 fprintf(stderr, "\t nmethod_info: BEGIN \n"); |
|
575 |
|
576 /* Instructions */ |
|
577 err = ps_pread(J->P, nm + OFFSET_CodeBlob_code_offset, &N->instrs_beg, SZ32); |
|
578 CHECK_FAIL(err); |
|
579 err = ps_pread(J->P, nm + OFFSET_CodeBlob_data_offset, &N->instrs_end, SZ32); |
|
580 CHECK_FAIL(err); |
|
581 err = ps_pread(J->P, nm + OFFSET_nmethod_deoptimize_offset, &N->deopt_beg, SZ32); |
|
582 CHECK_FAIL(err); |
|
583 err = ps_pread(J->P, nm + OFFSET_nmethod_orig_pc_offset, &N->orig_pc_offset, SZ32); |
|
584 CHECK_FAIL(err); |
|
585 |
|
586 /* Metadata */ |
|
587 err = ps_pread(J->P, nm + OFFSET_nmethod_metadata_offset, &N->metadata_beg, SZ32); |
|
588 CHECK_FAIL(err); |
|
589 err = ps_pread(J->P, nm + OFFSET_nmethod_scopes_data_offset, &N->metadata_end, SZ32); |
|
590 CHECK_FAIL(err); |
|
591 |
|
592 /* scopes_pcs */ |
|
593 err = ps_pread(J->P, nm + OFFSET_nmethod_scopes_pcs_offset, &N->scopes_pcs_beg, SZ32); |
|
594 CHECK_FAIL(err); |
|
595 err = ps_pread(J->P, nm + OFFSET_nmethod_handler_table_offset, &N->scopes_pcs_end, SZ32); |
|
596 CHECK_FAIL(err); |
|
597 |
|
598 /* scopes_data */ |
|
599 err = ps_pread(J->P, nm + OFFSET_nmethod_scopes_data_offset, &N->scopes_data_beg, SZ32); |
|
600 CHECK_FAIL(err); |
|
601 |
|
602 if (debug > 2 ) { |
|
603 N->scopes_data_end = N->scopes_pcs_beg; |
|
604 |
|
605 fprintf(stderr, "\t nmethod_info: instrs_beg: %#x, instrs_end: %#x\n", |
|
606 N->instrs_beg, N->instrs_end); |
|
607 |
|
608 fprintf(stderr, "\t nmethod_info: deopt_beg: %#x \n", |
|
609 N->deopt_beg); |
|
610 |
|
611 fprintf(stderr, "\t nmethod_info: orig_pc_offset: %#x \n", |
|
612 N->orig_pc_offset); |
|
613 |
|
614 fprintf(stderr, "\t nmethod_info: metadata_beg: %#x, metadata_end: %#x\n", |
|
615 N->metadata_beg, N->metadata_end); |
|
616 |
|
617 fprintf(stderr, "\t nmethod_info: scopes_data_beg: %#x, scopes_data_end: %#x\n", |
|
618 N->scopes_data_beg, N->scopes_data_end); |
|
619 |
|
620 fprintf(stderr, "\t nmethod_info: scopes_pcs_beg: %#x, scopes_pcs_end: %#x\n", |
|
621 N->scopes_pcs_beg, N->scopes_pcs_end); |
|
622 |
|
623 fprintf(stderr, "\t nmethod_info: END \n\n"); |
|
624 } |
|
625 return PS_OK; |
|
626 |
|
627 fail: |
|
628 return err; |
|
629 } |
|
630 |
|
631 static int |
|
632 raw_read_int(jvm_agent_t* J, uint64_t *buffer, int32_t *val) |
|
633 { |
|
634 int shift = 0; |
|
635 int value = 0; |
|
636 uint8_t ch = 0; |
|
637 int32_t err; |
|
638 int32_t sum; |
|
639 // Constants for UNSIGNED5 coding of Pack200 |
|
640 // see compressedStream.hpp |
|
641 enum { |
|
642 lg_H = 6, |
|
643 H = 1<<lg_H, |
|
644 BitsPerByte = 8, |
|
645 L = (1<<BitsPerByte)-H, |
|
646 }; |
|
647 int i; |
|
648 |
|
649 err = ps_pread(J->P, (*buffer)++, &ch, sizeof(uint8_t)); |
|
650 CHECK_FAIL(err); |
|
651 if (debug > 2) |
|
652 fprintf(stderr, "\t\t\t raw_read_int: *buffer: %#llx, ch: %#x\n", *buffer, ch); |
|
653 |
|
654 sum = ch; |
|
655 if ( sum >= L ) { |
|
656 int32_t lg_H_i = lg_H; |
|
657 // Read maximum of 5 total bytes (we've already read 1). |
|
658 // See CompressedReadStream::read_int_mb |
|
659 for ( i = 0; i < 4; i++) { |
|
660 err = ps_pread(J->P, (*buffer)++, &ch, sizeof(uint8_t)); |
|
661 CHECK_FAIL(err); |
|
662 sum += ch << lg_H_i; |
|
663 if (ch < L ) { |
|
664 *val = sum; |
|
665 return PS_OK; |
|
666 } |
|
667 lg_H_i += lg_H; |
|
668 } |
|
669 } |
|
670 *val = sum; |
|
671 return PS_OK; |
|
672 |
|
673 fail: |
|
674 return err; |
|
675 } |
|
676 |
|
677 static int |
|
678 read_pair(jvm_agent_t* J, uint64_t *buffer, int32_t *bci, int32_t *line) |
|
679 { |
|
680 uint8_t next = 0; |
|
681 int32_t bci_delta; |
|
682 int32_t line_delta; |
|
683 int32_t err; |
|
684 |
|
685 if (debug > 2) |
|
686 fprintf(stderr, "\t\t read_pair: BEGIN\n"); |
|
687 |
|
688 err = ps_pread(J->P, (*buffer)++, &next, sizeof(uint8_t)); |
|
689 CHECK_FAIL(err); |
|
690 |
|
691 if (next == 0) { |
|
692 if (debug > 2) |
|
693 fprintf(stderr, "\t\t read_pair: END: next == 0\n"); |
|
694 return 1; /* stream terminated */ |
|
695 } |
|
696 if (next == 0xFF) { |
|
697 if (debug > 2) |
|
698 fprintf(stderr, "\t\t read_pair: END: next == 0xFF\n"); |
|
699 |
|
700 /* Escape character, regular compression used */ |
|
701 |
|
702 err = raw_read_int(J, buffer, &bci_delta); |
|
703 CHECK_FAIL(err); |
|
704 |
|
705 err = raw_read_int(J, buffer, &line_delta); |
|
706 CHECK_FAIL(err); |
|
707 |
|
708 *bci += bci_delta; |
|
709 *line += line_delta; |
|
710 |
|
711 if (debug > 2) { |
|
712 fprintf(stderr, "\t\t read_pair: delta = (line %d: %d)\n", |
|
713 line_delta, bci_delta); |
|
714 fprintf(stderr, "\t\t read_pair: unpack= (line %d: %d)\n", |
|
715 *line, *bci); |
|
716 } |
|
717 } else { |
|
718 /* Single byte compression used */ |
|
719 *bci += next >> 3; |
|
720 *line += next & 0x7; |
|
721 if (debug > 2) { |
|
722 fprintf(stderr, "\t\t read_pair: delta = (line %d: %d)\n", |
|
723 next & 0x7, next >> 3); |
|
724 fprintf(stderr, "\t\t read_pair: unpack= (line %d: %d)\n", |
|
725 *line, *bci); |
|
726 } |
|
727 } |
|
728 if (debug > 2) |
|
729 fprintf(stderr, "\t\t read_pair: END\n"); |
|
730 return PS_OK; |
|
731 |
|
732 fail: |
|
733 if (debug) |
|
734 fprintf(stderr, "\t\t read_pair: FAIL\n"); |
|
735 return err; |
|
736 } |
|
737 |
|
738 static int |
|
739 line_number_from_bci(jvm_agent_t* J, Vframe_t *vf) |
|
740 { |
|
741 uint64_t buffer; |
|
742 uint16_t code_size; |
|
743 uint64_t code_end_delta; |
|
744 uint64_t constMethod; |
|
745 int8_t access_flags; |
|
746 int32_t best_bci = 0; |
|
747 int32_t stream_bci = 0; |
|
748 int32_t stream_line = 0; |
|
749 int32_t err; |
|
750 |
|
751 if (debug > 2) { |
|
752 char name[256]; |
|
753 err = name_for_methodPtr(J, vf->method, name, 256); |
|
754 CHECK_FAIL(err); |
|
755 fprintf(stderr, "\t line_number_from_bci: BEGIN, method name: %s, targ bci: %d\n", |
|
756 name, vf->bci); |
|
757 } |
|
758 |
|
759 err = read_pointer(J, vf->method + OFFSET_Method_constMethod, &constMethod); |
|
760 CHECK_FAIL(err); |
|
761 |
|
762 vf->line = 0; |
|
763 err = ps_pread(J->P, constMethod + OFFSET_ConstMethod_flags, &access_flags, sizeof(int8_t)); |
|
764 CHECK_FAIL(err); |
|
765 |
|
766 if (!(access_flags & ConstMethod_has_linenumber_table)) { |
|
767 if (debug > 2) |
|
768 fprintf(stderr, "\t line_number_from_bci: END: !HAS_LINE_NUMBER_TABLE \n\n"); |
|
769 return PS_OK; |
|
770 } |
|
771 |
|
772 /* The line numbers are a short array of 2-tuples [start_pc, line_number]. |
|
773 * Not necessarily sorted and not necessarily one-to-one. |
|
774 */ |
|
775 |
|
776 err = ps_pread(J->P, constMethod + OFFSET_ConstMethod_code_size, &code_size, SZ16); |
|
777 CHECK_FAIL(err); |
|
778 |
|
779 /* inlined_table_start() */ |
|
780 code_end_delta = (uint64_t) (access_flags & AccessFlags_NATIVE) ? 2*POINTER_SIZE : 0; |
|
781 buffer = constMethod + (uint64_t) SIZE_ConstMethod + (uint64_t) code_size + code_end_delta; |
|
782 |
|
783 if (debug > 2) { |
|
784 fprintf(stderr, "\t\t line_number_from_bci: method: %#llx, native: %d\n", |
|
785 vf->method, (access_flags & AccessFlags_NATIVE)); |
|
786 fprintf(stderr, "\t\t line_number_from_bci: buffer: %#llx, code_size: %d\n", |
|
787 buffer, (int) code_size); |
|
788 } |
|
789 |
|
790 while (read_pair(J, &buffer, &stream_bci, &stream_line) == 0) { |
|
791 if (stream_bci == vf->bci) { |
|
792 /* perfect match */ |
|
793 if (debug > 2) |
|
794 fprintf(stderr, "\t line_number_from_bci: END: exact line: %ld \n\n", vf->line); |
|
795 vf->line = stream_line; |
|
796 return PS_OK; |
|
797 } else { |
|
798 /* update best_bci/line */ |
|
799 if (stream_bci < vf->bci && stream_bci >= best_bci) { |
|
800 best_bci = stream_bci; |
|
801 vf->line = stream_line; |
|
802 if (debug > 2) { |
|
803 fprintf(stderr, "\t line_number_from_bci: best_bci: %ld, best_line: %ld\n", |
|
804 best_bci, vf->line); |
|
805 } |
|
806 } |
|
807 } |
|
808 } |
|
809 if (debug > 2) |
|
810 fprintf(stderr, "\t line_number_from_bci: END: line: %ld \n\n", vf->line); |
|
811 return PS_OK; |
|
812 |
|
813 fail: |
|
814 if (debug) |
|
815 fprintf(stderr, "\t line_number_from_bci: FAIL\n"); |
|
816 return err; |
|
817 } |
|
818 |
|
819 static int |
|
820 get_real_pc(Nmethod_t *N, uint64_t pc_desc, uint64_t *real_pc) |
|
821 { |
|
822 int32_t pc_offset; |
|
823 int32_t err; |
|
824 |
|
825 err = ps_pread(N->J->P, pc_desc + OFFSET_PcDesc_pc_offset, &pc_offset, SZ32); |
|
826 CHECK_FAIL(err); |
|
827 |
|
828 *real_pc = N->nm + N->instrs_beg + pc_offset; |
|
829 if (debug > 2) { |
|
830 fprintf(stderr, "\t\t get_real_pc: pc_offset: %lx, real_pc: %llx\n", |
|
831 pc_offset, *real_pc); |
|
832 } |
|
833 return PS_OK; |
|
834 |
|
835 fail: |
|
836 return err; |
|
837 } |
|
838 |
|
839 /* Finds a PcDesc with real-pc equal to N->pc */ |
|
840 static int pc_desc_at(Nmethod_t *N) |
|
841 { |
|
842 uint64_t pc_diff; |
|
843 int32_t offs; |
|
844 int32_t err; |
|
845 |
|
846 if (debug > 2) |
|
847 fprintf(stderr, "\t pc_desc_at: BEGIN\n"); |
|
848 |
|
849 N->vf_cnt = 0; |
|
850 N->pc_desc = 0; |
|
851 |
|
852 for (offs = N->scopes_pcs_beg; offs < N->scopes_pcs_end; offs += SIZE_PcDesc) { |
|
853 uint64_t pd; |
|
854 uint64_t best_pc_diff = 16; /* some approximation */ |
|
855 uint64_t real_pc = 0; |
|
856 |
|
857 pd = N->nm + offs; |
|
858 err = get_real_pc(N, pd, &real_pc); |
|
859 CHECK_FAIL(err); |
|
860 |
|
861 pc_diff = real_pc - N->pc; |
|
862 |
|
863 /* In general, this fragment should work */ |
|
864 if (pc_diff == 0) { |
|
865 N->pc_desc = pd; |
|
866 if (debug) { |
|
867 fprintf(stderr, "\t pc_desc_at: END: pc_desc: FOUND: %#lx \n\n", pd); |
|
868 } |
|
869 return PS_OK; |
|
870 } |
|
871 /* This fragment is to be able to find out an appropriate |
|
872 * pc_desc entry even if pc_desc info is inaccurate. |
|
873 */ |
|
874 if (best_pc_diff > pc_diff && pc_diff > 0) { |
|
875 best_pc_diff = pc_diff; |
|
876 N->pc_desc = pd; |
|
877 } |
|
878 } |
|
879 if (debug) { |
|
880 fprintf(stderr, "\t pc_desc_at: END: pc_desc NOT FOUND"); |
|
881 if (pc_diff < 20) |
|
882 fprintf(stderr, ", best pc_diff: %d\n\n", pc_diff); |
|
883 else |
|
884 fprintf(stderr, "\n\n"); |
|
885 } |
|
886 return PS_OK; |
|
887 |
|
888 fail: |
|
889 return err; |
|
890 } |
|
891 |
|
892 static int |
|
893 scope_desc_at(Nmethod_t *N, int32_t decode_offset, Vframe_t *vf) |
|
894 { |
|
895 uint64_t buffer; |
|
896 int32_t err; |
|
897 |
|
898 if (debug > 2) { |
|
899 fprintf(stderr, "\t\t scope_desc_at: BEGIN \n"); |
|
900 } |
|
901 |
|
902 buffer = N->nm + N->scopes_data_beg + decode_offset; |
|
903 |
|
904 err = raw_read_int(N->J, &buffer, &vf->sender_decode_offset); |
|
905 CHECK_FAIL(err); |
|
906 |
|
907 err = raw_read_int(N->J, &buffer, &vf->methodIdx); |
|
908 CHECK_FAIL(err); |
|
909 |
|
910 err = raw_read_int(N->J, &buffer, &vf->bci); |
|
911 CHECK_FAIL(err); |
|
912 |
|
913 if (debug > 2) { |
|
914 fprintf(stderr, "\t\t scope_desc_at: sender_decode_offset: %#x\n", |
|
915 vf->sender_decode_offset); |
|
916 fprintf(stderr, "\t\t scope_desc_at: methodIdx: %d\n", vf->methodIdx); |
|
917 fprintf(stderr, "\t\t scope_desc_at: bci: %d\n", vf->bci); |
|
918 |
|
919 fprintf(stderr, "\t\t scope_desc_at: END \n\n"); |
|
920 } |
|
921 return PS_OK; |
|
922 |
|
923 fail: |
|
924 return err; |
|
925 } |
|
926 |
|
927 static int scopeDesc_chain(Nmethod_t *N) { |
|
928 int32_t decode_offset = 0; |
|
929 int32_t err; |
|
930 |
|
931 if (debug > 2) { |
|
932 fprintf(stderr, "\t scopeDesc_chain: BEGIN\n"); |
|
933 } |
|
934 |
|
935 err = ps_pread(N->J->P, N->pc_desc + OFFSET_PcDesc_scope_decode_offset, |
|
936 &decode_offset, SZ32); |
|
937 CHECK_FAIL(err); |
|
938 |
|
939 while (decode_offset > 0) { |
|
940 Vframe_t *vf = &N->vframes[N->vf_cnt]; |
|
941 |
|
942 if (debug > 2) { |
|
943 fprintf(stderr, "\t scopeDesc_chain: decode_offset: %#x\n", decode_offset); |
|
944 } |
|
945 |
|
946 err = scope_desc_at(N, decode_offset, vf); |
|
947 CHECK_FAIL(err); |
|
948 |
|
949 if (vf->methodIdx > ((N->metadata_end - N->metadata_beg) / POINTER_SIZE)) { |
|
950 fprintf(stderr, "\t scopeDesc_chain: (methodIdx > metadata length) !\n"); |
|
951 return -1; |
|
952 } |
|
953 err = read_pointer(N->J, N->nm + N->metadata_beg + (vf->methodIdx-1)*POINTER_SIZE, |
|
954 &vf->method); |
|
955 CHECK_FAIL(err); |
|
956 |
|
957 if (vf->method) { |
|
958 N->vf_cnt++; |
|
959 err = line_number_from_bci(N->J, vf); |
|
960 CHECK_FAIL(err); |
|
961 if (debug > 2) { |
|
962 fprintf(stderr, "\t scopeDesc_chain: method: %#8llx, line: %ld\n", |
|
963 vf->method, vf->line); |
|
964 } |
|
965 } |
|
966 decode_offset = vf->sender_decode_offset; |
|
967 } |
|
968 if (debug > 2) { |
|
969 fprintf(stderr, "\t scopeDesc_chain: END \n\n"); |
|
970 } |
|
971 return PS_OK; |
|
972 |
|
973 fail: |
|
974 if (debug) { |
|
975 fprintf(stderr, "\t scopeDesc_chain: FAIL \n\n"); |
|
976 } |
|
977 return err; |
|
978 } |
|
979 |
|
980 |
|
981 static int |
|
982 name_for_nmethod(jvm_agent_t* J, |
|
983 uint64_t nm, |
|
984 uint64_t pc, |
|
985 uint64_t method, |
|
986 char *result, |
|
987 size_t size, |
|
988 Jframe_t *jframe |
|
989 ) { |
|
990 Nmethod_t *N; |
|
991 Vframe_t *vf; |
|
992 int32_t err; |
|
993 int deoptimized = 0; |
|
994 |
|
995 if (debug) { |
|
996 fprintf(stderr, "name_for_nmethod: BEGIN: nmethod: %#llx, pc: %#llx\n", nm, pc); |
|
997 } |
|
998 if (J->N == NULL) { |
|
999 J->N = (Nmethod_t *) malloc(sizeof(Nmethod_t)); |
|
1000 } |
|
1001 memset(J->N, 0, sizeof(Nmethod_t)); /* Initial stat: all values are zeros */ |
|
1002 N = J->N; |
|
1003 N->J = J; |
|
1004 N->nm = nm; |
|
1005 N->pc = pc; |
|
1006 N->jframe = jframe; |
|
1007 |
|
1008 err = nmethod_info(N); |
|
1009 CHECK_FAIL(err); |
|
1010 if (debug) { |
|
1011 fprintf(stderr, "name_for_nmethod: pc: %#llx, deopt_pc: %#llx\n", |
|
1012 pc, N->nm + N->deopt_beg); |
|
1013 } |
|
1014 |
|
1015 /* check for a deoptimized frame */ |
|
1016 if ( pc == N->nm + N->deopt_beg) { |
|
1017 uint64_t base; |
|
1018 if (debug) { |
|
1019 fprintf(stderr, "name_for_nmethod: found deoptimized frame\n"); |
|
1020 } |
|
1021 if (J->prev_fr.sender_sp != 0) { |
|
1022 base = J->prev_fr.sender_sp + N->orig_pc_offset; |
|
1023 } else { |
|
1024 base = J->curr_fr.sp + N->orig_pc_offset; |
|
1025 } |
|
1026 err = read_pointer(J, base, &N->pc); |
|
1027 CHECK_FAIL(err); |
|
1028 if (debug) { |
|
1029 fprintf(stderr, "name_for_nmethod: found deoptimized frame converting pc from %#8llx to %#8llx\n", |
|
1030 pc, N->pc); |
|
1031 } |
|
1032 deoptimized = 1; |
|
1033 } |
|
1034 |
|
1035 err = pc_desc_at(N); |
|
1036 CHECK_FAIL(err); |
|
1037 |
|
1038 if (N->pc_desc > 0) { |
|
1039 jframe->locinf = 1; |
|
1040 err = scopeDesc_chain(N); |
|
1041 CHECK_FAIL(err); |
|
1042 } |
|
1043 result[0] = COMP_METHOD_SIGN; |
|
1044 vf = &N->vframes[0]; |
|
1045 if (N->vf_cnt > 0) { |
|
1046 jframe->vf_cnt = N->vf_cnt; |
|
1047 jframe->bci = vf->bci; |
|
1048 jframe->line = vf->line; |
|
1049 err = name_for_methodPtr(J, N->vframes[0].method, result+1, size-1); |
|
1050 CHECK_FAIL(err); |
|
1051 } else { |
|
1052 err = name_for_methodPtr(J, method, result+1, size-1); |
|
1053 CHECK_FAIL(err); |
|
1054 } |
|
1055 if (deoptimized) { |
|
1056 strncat(result + 1, " [deoptimized frame]; ", size-1); |
|
1057 } else { |
|
1058 strncat(result + 1, " [compiled] ", size-1); |
|
1059 } |
|
1060 if (debug) |
|
1061 fprintf(stderr, "name_for_nmethod: END: method name: %s, vf_cnt: %d\n\n", |
|
1062 result, N->vf_cnt); |
|
1063 return PS_OK; |
|
1064 |
|
1065 fail: |
|
1066 if (debug) |
|
1067 fprintf(stderr, "name_for_nmethod: FAIL \n\n"); |
|
1068 return err; |
|
1069 } |
|
1070 |
|
1071 int is_bci(intptr_t bcx) { |
|
1072 switch (DATA_MODEL) { |
|
1073 case PR_MODEL_LP64: |
|
1074 return ((uintptr_t) bcx) <= ((uintptr_t) MAX_METHOD_CODE_SIZE) ; |
|
1075 case PR_MODEL_ILP32: |
|
1076 default: |
|
1077 return 0 <= bcx && bcx <= MAX_METHOD_CODE_SIZE; |
|
1078 } |
|
1079 } |
|
1080 |
|
1081 static int |
|
1082 name_for_imethod(jvm_agent_t* J, |
|
1083 uint64_t bcx, |
|
1084 uint64_t method, |
|
1085 char *result, |
|
1086 size_t size, |
|
1087 Jframe_t *jframe |
|
1088 ) { |
|
1089 uint64_t bci; |
|
1090 uint64_t constMethod; |
|
1091 Vframe_t vframe = {0}; |
|
1092 Vframe_t *vf = &vframe; |
|
1093 int32_t err; |
|
1094 |
|
1095 err = read_pointer(J, method + OFFSET_Method_constMethod, &constMethod); |
|
1096 CHECK_FAIL(err); |
|
1097 |
|
1098 bci = is_bci(bcx) ? bcx : bcx - (constMethod + (uint64_t) SIZE_ConstMethod); |
|
1099 |
|
1100 if (debug) |
|
1101 fprintf(stderr, "\t name_for_imethod: BEGIN: method: %#llx\n", method); |
|
1102 |
|
1103 err = name_for_methodPtr(J, method, result, size); |
|
1104 CHECK_FAIL(err); |
|
1105 if (debug) |
|
1106 fprintf(stderr, "\t name_for_imethod: method name: %s\n", result); |
|
1107 |
|
1108 if (bci > 0) { |
|
1109 vf->method = method; |
|
1110 vf->bci = bci; |
|
1111 err = line_number_from_bci(J, vf); |
|
1112 CHECK_FAIL(err); |
|
1113 } |
|
1114 jframe->bci = vf->bci; |
|
1115 jframe->line = vf->line; |
|
1116 jframe->locinf = 1; |
|
1117 |
|
1118 if (debug) { |
|
1119 fprintf(stderr, "\t name_for_imethod: END: bci: %d, line: %d\n\n", |
|
1120 vf->bci, vf->line); |
|
1121 } |
|
1122 return PS_OK; |
|
1123 |
|
1124 fail: |
|
1125 if (debug) |
|
1126 fprintf(stderr, "\t name_for_imethod: FAIL\n"); |
|
1127 return err; |
|
1128 } |
|
1129 |
|
1130 static int |
|
1131 name_for_codecache(jvm_agent_t* J, uint64_t fp, uint64_t pc, char * result, |
|
1132 size_t size, Jframe_t *jframe, int* is_interpreted) |
|
1133 { |
|
1134 uint64_t start; |
|
1135 uint64_t vtbl; |
|
1136 int32_t err; |
|
1137 *is_interpreted = 0; |
|
1138 |
|
1139 result[0] = '\0'; |
|
1140 |
|
1141 err = find_start(J, pc, &start); |
|
1142 CHECK_FAIL(err); |
|
1143 |
|
1144 err = read_pointer(J, start, &vtbl); |
|
1145 CHECK_FAIL(err); |
|
1146 |
|
1147 if (vtbl == J->nmethod_vtbl) { |
|
1148 uint64_t method; |
|
1149 |
|
1150 err = read_pointer(J, start + OFFSET_nmethod_method, &method); |
|
1151 CHECK_FAIL(err); |
|
1152 |
|
1153 if (debug) { |
|
1154 fprintf(stderr, "name_for_codecache: start: %#8llx, pc: %#8llx, method: %#8llx \n", |
|
1155 start, pc, method); |
|
1156 } |
|
1157 err = name_for_nmethod(J, start, pc, method, result, size, jframe); |
|
1158 CHECK_FAIL(err); |
|
1159 } else if (vtbl == J->BufferBlob_vtbl) { |
|
1160 const char * name; |
|
1161 |
|
1162 err = read_string_pointer(J, start + OFFSET_CodeBlob_name, &name); |
|
1163 |
|
1164 /* |
|
1165 * Temporary usage of string "Interpreter". |
|
1166 * We need some other way to distinguish "StubRoutines" |
|
1167 * and regular interpreted frames. |
|
1168 */ |
|
1169 if (err == PS_OK && strncmp(name, "Interpreter", 11) == 0) { |
|
1170 *is_interpreted = 1; |
|
1171 if (is_method(J, J->methodPtr)) { |
|
1172 return name_for_imethod(J, J->bcx, J->methodPtr, result, size, jframe); |
|
1173 } |
|
1174 } |
|
1175 |
|
1176 if (err == PS_OK) { |
|
1177 strncpy(result, name, size); |
|
1178 free((void*)name); |
|
1179 } else { |
|
1180 strncpy(result, "<unknown BufferBlob>", size); |
|
1181 } |
|
1182 /* return PS_OK; */ |
|
1183 } else { |
|
1184 const char * name; |
|
1185 |
|
1186 err = read_string_pointer(J, start + OFFSET_CodeBlob_name, &name); |
|
1187 if (err == PS_OK) { |
|
1188 strncpy(result, name, size); |
|
1189 free((void*)name); |
|
1190 } else { |
|
1191 strncpy(result, "<unknown CodeBlob>", size); |
|
1192 WARN1("unknown CodeBlob: vtbl = 0x%x", vtbl); |
|
1193 } |
|
1194 } |
|
1195 result[size-1] = '\0'; |
|
1196 |
|
1197 #ifdef X86_COMPILER2 |
|
1198 if (vtbl != J->RuntimeStub_vtbl) { |
|
1199 uint64_t trial_pc; |
|
1200 int frame_size; |
|
1201 err = ps_pread(J->P, start + OFFSET_CodeBlob_frame_size, |
|
1202 &frame_size, SZ32); |
|
1203 CHECK_FAIL(err); |
|
1204 |
|
1205 // frame_size is in words, we want bytes. |
|
1206 frame_size *= POINTER_SIZE; /* word => byte conversion */ |
|
1207 |
|
1208 /* |
|
1209 Because c2 doesn't use FP as a framepointer the value of sp/fp we receive |
|
1210 in the initial entry to a set of stack frames containing server frames |
|
1211 will pretty much be nonsense. We can detect that nonsense by looking to |
|
1212 see if the PC we received is correct if we look at the expected storage |
|
1213 location in relation to the FP (ie. POINTER_SIZE(FP) ) |
|
1214 */ |
|
1215 |
|
1216 err = read_pointer(J, fp + POINTER_SIZE , &trial_pc); |
|
1217 if ( (err != PS_OK || trial_pc != pc) && frame_size > 0 ) { |
|
1218 // Either we couldn't even read at the "fp" or the pc didn't match |
|
1219 // both are sure clues that the fp is bogus. We no search the stack |
|
1220 // for a reasonable number of words trying to find the bogus fp |
|
1221 // and the current pc in adjacent words. The we will be able to |
|
1222 // deduce an approximation of the frame pointer and actually get |
|
1223 // the correct stack pointer. Which we can then unwind for the |
|
1224 // next frame. |
|
1225 int i; |
|
1226 uint64_t check; |
|
1227 uint64_t base = J->curr_fr.sp; |
|
1228 uint64_t prev_fp = 0; |
|
1229 for ( i = 0; i < frame_size * 5 ; i++, base += POINTER_SIZE ) { |
|
1230 err = read_pointer(J, base , &check); |
|
1231 CHECK_FAIL(err); |
|
1232 if (check == fp) { |
|
1233 base += POINTER_SIZE; |
|
1234 err = read_pointer(J, base , &check); |
|
1235 CHECK_FAIL(err); |
|
1236 if (check == pc) { |
|
1237 if (debug) { |
|
1238 fprintf(stderr, "name_for_codecache: found matching fp/pc combo at 0x%llx\n", base - POINTER_SIZE); |
|
1239 } |
|
1240 prev_fp = base - 2 * POINTER_SIZE; |
|
1241 break; |
|
1242 } |
|
1243 } |
|
1244 } |
|
1245 if ( prev_fp != 0 ) { |
|
1246 // real_sp is the sp we should have received for this frame |
|
1247 uint64_t real_sp = prev_fp + 2 * POINTER_SIZE; |
|
1248 // +POINTER_SIZE because callee owns the return address so caller's sp is +1 word |
|
1249 jframe->new_sp = real_sp + frame_size + POINTER_SIZE; |
|
1250 err = read_pointer(J, jframe->new_sp - POINTER_SIZE , &jframe->new_pc); |
|
1251 CHECK_FAIL(err); |
|
1252 err = read_pointer(J, jframe->new_sp - 2*POINTER_SIZE, &jframe->new_fp); |
|
1253 CHECK_FAIL(err); |
|
1254 return PS_OK; |
|
1255 } |
|
1256 } |
|
1257 |
|
1258 /* A prototype to workaround FP absence */ |
|
1259 /* |
|
1260 * frame_size can be 0 for StubRoutines (1) frame. |
|
1261 * In this case it should work with fp as usual. |
|
1262 */ |
|
1263 if (frame_size > 0) { |
|
1264 jframe->new_fp = J->prev_fr.fp + frame_size; |
|
1265 jframe->new_sp = jframe->new_fp + 2 * POINTER_SIZE; |
|
1266 } else { |
|
1267 memset(&J->curr_fr, 0, sizeof(Frame_t)); |
|
1268 err = read_pointer(J, fp, &jframe->new_fp); |
|
1269 CHECK_FAIL(err); |
|
1270 |
|
1271 err = read_pointer(J, jframe->new_fp + POINTER_SIZE, &jframe->new_pc); |
|
1272 CHECK_FAIL(err); |
|
1273 } |
|
1274 if (debug) { |
|
1275 fprintf(stderr, "name_for_codecache: %s, frame_size=%#lx\n", |
|
1276 result, frame_size); |
|
1277 fprintf(stderr, "name_for_codecache: prev_fr.fp=%#lx, fp=%#lx\n", |
|
1278 J->prev_fr.fp, jframe->new_fp); |
|
1279 } |
|
1280 } |
|
1281 #endif /* X86_COMPILER2 */ |
|
1282 |
|
1283 return PS_OK; |
|
1284 |
|
1285 fail: |
|
1286 return err; |
|
1287 } |
|
1288 |
|
1289 int Jget_vframe(jvm_agent_t* J, int vframe_no, |
|
1290 char *name, size_t size, Jframe_t *jframe) |
|
1291 { |
|
1292 Nmethod_t *N = J->N; |
|
1293 Vframe_t *vf; |
|
1294 int32_t err; |
|
1295 |
|
1296 if (vframe_no >= N->vf_cnt) { |
|
1297 (void) sprintf(name, "Wrong inlinedMethod%1d()", vframe_no); |
|
1298 return -1; |
|
1299 } |
|
1300 vf = N->vframes + vframe_no; |
|
1301 name[0] = COMP_METHOD_SIGN; |
|
1302 err = name_for_methodPtr(J, vf->method, name + 1, size); |
|
1303 CHECK_FAIL(err); |
|
1304 |
|
1305 jframe->bci = vf->bci; |
|
1306 jframe->line = vf->line; |
|
1307 if (debug) { |
|
1308 fprintf(stderr, "\t Jget_vframe: method name: %s, line: %ld\n", |
|
1309 name, vf->line); |
|
1310 } |
|
1311 return PS_OK; |
|
1312 |
|
1313 fail: |
|
1314 if (debug) { |
|
1315 fprintf(stderr, "\t Jget_vframe: FAIL\n"); |
|
1316 } |
|
1317 return err; |
|
1318 } |
|
1319 |
|
1320 #define MAX_SYM_SIZE 256 |
|
1321 |
|
1322 int Jlookup_by_regs(jvm_agent_t* J, const prgregset_t regs, char *name, |
|
1323 size_t size, Jframe_t *jframe) { |
|
1324 uintptr_t fp; |
|
1325 uintptr_t pc; |
|
1326 /* arguments given to read_pointer need to be worst case sized */ |
|
1327 uint64_t methodPtr = 0; |
|
1328 uint64_t sender_sp; |
|
1329 uint64_t bcx = 0; |
|
1330 int is_interpreted = 0; |
|
1331 int result = PS_OK; |
|
1332 int err = PS_OK; |
|
1333 |
|
1334 if (J == NULL) { |
|
1335 return -1; |
|
1336 } |
|
1337 |
|
1338 jframe->vf_cnt = 1; |
|
1339 jframe->new_fp = 0; |
|
1340 jframe->new_pc = 0; |
|
1341 jframe->line = 0; |
|
1342 jframe->bci = 0; |
|
1343 jframe->locinf = 0; |
|
1344 |
|
1345 read_volatiles(J); |
|
1346 pc = (uintptr_t) regs[R_PC]; |
|
1347 J->curr_fr.pc = pc; |
|
1348 J->curr_fr.fp = regs[R_FP]; |
|
1349 J->curr_fr.sp = regs[R_SP]; |
|
1350 |
|
1351 if (debug) |
|
1352 fprintf(stderr, "Jlookup_by_regs: BEGINs: fp=%#lx, pc=%#lx\n", regs[R_FP], pc); |
|
1353 |
|
1354 #if defined(sparc) || defined(__sparc) |
|
1355 /* The following workaround is for SPARC. CALL instruction occupates 8 bytes. |
|
1356 * In the pcDesc structure return pc offset is recorded for CALL instructions. |
|
1357 * regs[R_PC] contains a CALL instruction pc offset. |
|
1358 */ |
|
1359 pc += 8; |
|
1360 bcx = (uintptr_t) regs[R_L1]; |
|
1361 methodPtr = (uintptr_t) regs[R_L2]; |
|
1362 sender_sp = regs[R_I5]; |
|
1363 if (debug > 2) { |
|
1364 fprintf(stderr, "\nregs[R_I1]=%lx, regs[R_I2]=%lx, regs[R_I5]=%lx, regs[R_L1]=%lx, regs[R_L2]=%lx\n", |
|
1365 regs[R_I1], regs[R_I2], regs[R_I5], regs[R_L1], regs[R_L2]); |
|
1366 } |
|
1367 #elif defined(i386) || defined(__i386) || defined(__amd64) |
|
1368 |
|
1369 fp = (uintptr_t) regs[R_FP]; |
|
1370 if (J->prev_fr.fp == 0) { |
|
1371 #ifdef X86_COMPILER2 |
|
1372 /* A workaround for top java frames */ |
|
1373 J->prev_fr.fp = (uintptr_t)(regs[R_SP] - 2 * POINTER_SIZE); |
|
1374 #else |
|
1375 J->prev_fr.fp = (uintptr_t)(regs[R_SP] - POINTER_SIZE); |
|
1376 #endif /* COMPILER2 */ |
|
1377 } |
|
1378 if (debug > 2) { |
|
1379 printf("Jlookup_by_regs: J->prev_fr.fp = %#lx\n", J->prev_fr.fp); |
|
1380 } |
|
1381 |
|
1382 if (read_pointer(J, fp + OFFSET_interpreter_frame_method, &methodPtr) != PS_OK) { |
|
1383 methodPtr = 0; |
|
1384 } |
|
1385 if (read_pointer(J, fp + OFFSET_interpreter_frame_sender_sp, &sender_sp) != PS_OK) { |
|
1386 sender_sp = 0; |
|
1387 } |
|
1388 if (read_pointer(J, fp + OFFSET_interpreter_frame_bcx_offset, &bcx) != PS_OK) { |
|
1389 bcx = 0; |
|
1390 } |
|
1391 #endif /* i386 */ |
|
1392 |
|
1393 J->methodPtr = methodPtr; |
|
1394 J->bcx = bcx; |
|
1395 |
|
1396 /* On x86 with C2 JVM: native frame may have wrong regs[R_FP] |
|
1397 * For example: JVM_SuspendThread frame poins to the top interpreted frame. |
|
1398 * If we call is_method(J, methodPtr) before codecache_contains(J, pc) |
|
1399 * then we go over and omit both: nmethod and I2CAdapter frames. |
|
1400 * Note, that regs[R_PC] is always correct if frame defined correctly. |
|
1401 * So it is better to call codecache_contains(J, pc) from the beginning. |
|
1402 */ |
|
1403 #ifndef X86_COMPILER2 |
|
1404 if (is_method(J, J->methodPtr)) { |
|
1405 result = name_for_imethod(J, bcx, J->methodPtr, name, size, jframe); |
|
1406 /* If the methodPtr is a method then this is highly likely to be |
|
1407 an interpreter frame */ |
|
1408 if (result >= 0) { |
|
1409 is_interpreted = 1; |
|
1410 } |
|
1411 } else |
|
1412 #endif /* ! X86_COMPILER2 */ |
|
1413 |
|
1414 if (codecache_contains(J, pc)) { |
|
1415 result = name_for_codecache(J, fp, pc, name, size, jframe, &is_interpreted); |
|
1416 } |
|
1417 #ifdef X86_COMPILER2 |
|
1418 else if (is_method(J, J->methodPtr)) { |
|
1419 result = name_for_imethod(J, bcx, J->methodPtr, name, size, jframe); |
|
1420 /* If the methodPtr is a method then this is highly likely to be |
|
1421 an interpreter frame */ |
|
1422 if (result >= 0) { |
|
1423 is_interpreted = 1; |
|
1424 } |
|
1425 } |
|
1426 #endif /* X86_COMPILER2 */ |
|
1427 else { |
|
1428 if (debug) { |
|
1429 fprintf(stderr, "Jlookup_by_regs: END with -1\n\n"); |
|
1430 } |
|
1431 result = -1; |
|
1432 } |
|
1433 if (!is_interpreted) { |
|
1434 sender_sp = 0; |
|
1435 } |
|
1436 J->curr_fr.sender_sp = sender_sp; |
|
1437 |
|
1438 #ifdef X86_COMPILER2 |
|
1439 if (!J->curr_fr.fp) { |
|
1440 J->curr_fr.fp = (jframe->new_fp) ? jframe->new_fp : (uintptr_t)regs[R_FP]; |
|
1441 } |
|
1442 if (!jframe->new_pc && jframe->new_fp) { |
|
1443 // This seems dubious |
|
1444 read_pointer(J, jframe->new_fp + POINTER_SIZE, &jframe->new_pc); |
|
1445 CHECK_FAIL(err); |
|
1446 if (debug > 2) { |
|
1447 printf("Jlookup_by_regs: (update pc) jframe->new_fp: %#llx, jframe->new_pc: %#llx\n", |
|
1448 jframe->new_fp, jframe->new_pc); |
|
1449 } |
|
1450 } |
|
1451 |
|
1452 #endif /* X86_COMPILER2 */ |
|
1453 J->prev_fr = J->curr_fr; |
|
1454 |
|
1455 if (debug) |
|
1456 fprintf(stderr, "Jlookup_by_regs: END\n\n"); |
|
1457 |
|
1458 return result; |
|
1459 |
|
1460 fail: |
|
1461 return err; |
|
1462 } |
|
1463 |
|
1464 void update_gregs(prgregset_t gregs, Jframe_t jframe) { |
|
1465 #ifdef X86_COMPILER2 |
|
1466 if (debug > 0) { |
|
1467 fprintf(stderr, "update_gregs: before update sp = 0x%llx, fp = 0x%llx, pc = 0x%llx\n", gregs[R_SP], gregs[R_FP], gregs[R_PC]); |
|
1468 } |
|
1469 /* |
|
1470 * A workaround for java C2 frames with unconventional FP. |
|
1471 * may have to modify regset with new values for FP/PC/SP when needed. |
|
1472 */ |
|
1473 if (jframe.new_sp) { |
|
1474 *((uintptr_t *) &gregs[R_SP]) = (uintptr_t) jframe.new_sp; |
|
1475 } else { |
|
1476 // *((uintptr_t *) &gregs[R_SP]) = (uintptr_t) gregs[R_FP] + 2 * POINTER_SIZE; |
|
1477 } |
|
1478 |
|
1479 if (jframe.new_fp) { |
|
1480 *((uintptr_t *) &gregs[R_FP]) = (uintptr_t) jframe.new_fp; |
|
1481 } |
|
1482 if (jframe.new_pc) { |
|
1483 *((uintptr_t *) &gregs[R_PC]) = (uintptr_t) jframe.new_pc; |
|
1484 } |
|
1485 if (debug > 0) { |
|
1486 fprintf(stderr, "update_gregs: after update sp = 0x%llx, fp = 0x%llx, pc = 0x%llx\n", gregs[R_SP], gregs[R_FP], gregs[R_PC]); |
|
1487 } |
|
1488 #endif /* X86_COMPILER2 */ |
|
1489 } |
|
1490 |
|
1491 /* |
|
1492 * Iterates over java frames at current location given by 'gregs'. |
|
1493 * |
|
1494 * Returns -1 if no java frames are present or if an error is encountered. |
|
1495 * Returns the result of calling 'func' if the return value is non-zero. |
|
1496 * Returns 0 otherwise. |
|
1497 */ |
|
1498 int Jframe_iter(jvm_agent_t *J, prgregset_t gregs, java_stack_f *func, void* cld) { |
|
1499 char buf[MAX_SYM_SIZE + 1]; |
|
1500 Jframe_t jframe; |
|
1501 int i = 0, res; |
|
1502 #ifdef X86_COMPILER2 |
|
1503 if (debug > 0) { |
|
1504 fprintf(stderr, "Jframe_iter: Entry sp = 0x%llx, fp = 0x%llx, pc = 0x%llx\n", gregs[R_SP], gregs[R_FP], gregs[R_PC]); |
|
1505 } |
|
1506 #endif /* X86_COMPILER2 */ |
|
1507 |
|
1508 memset(&jframe, 0, sizeof(Jframe_t)); |
|
1509 memset(buf, 0, sizeof(buf)); |
|
1510 res = Jlookup_by_regs(J, gregs, buf, sizeof(buf), &jframe); |
|
1511 if (res != PS_OK) |
|
1512 return (-1); |
|
1513 |
|
1514 |
|
1515 res = func(cld, gregs, buf, (jframe.locinf)? jframe.bci : -1, |
|
1516 jframe.line, NULL); |
|
1517 if (res != 0) { |
|
1518 update_gregs(gregs, jframe); |
|
1519 return (res); |
|
1520 } |
|
1521 for (i = 1; i < jframe.vf_cnt; i++) { |
|
1522 Jget_vframe(J, i, buf, sizeof(buf), &jframe); |
|
1523 res = func(cld, gregs, buf, (jframe.locinf)? jframe.bci : -1, |
|
1524 jframe.line, NULL); |
|
1525 if (res != 0) { |
|
1526 update_gregs(gregs, jframe); |
|
1527 return (res); |
|
1528 } |
|
1529 } |
|
1530 update_gregs(gregs, jframe); |
|
1531 return (0); |
|
1532 } |