Sat, 24 Oct 2020 16:43:03 +0800
Merge
duke@1 | 1 | /* |
duke@1 | 2 | * reserved comment block |
duke@1 | 3 | * DO NOT REMOVE OR ALTER! |
duke@1 | 4 | */ |
duke@1 | 5 | package com.sun.org.apache.bcel.internal.util; |
duke@1 | 6 | |
joehw@2102 | 7 | /* |
joehw@2102 | 8 | * Licensed to the Apache Software Foundation (ASF) under one or more |
joehw@2102 | 9 | * contributor license agreements. See the NOTICE file distributed with |
joehw@2102 | 10 | * this work for additional information regarding copyright ownership. |
joehw@2102 | 11 | * The ASF licenses this file to You under the Apache License, Version 2.0 |
joehw@2102 | 12 | * (the "License"); you may not use this file except in compliance with |
joehw@2102 | 13 | * the License. You may obtain a copy of the License at |
duke@1 | 14 | * |
joehw@2102 | 15 | * http://www.apache.org/licenses/LICENSE-2.0 |
duke@1 | 16 | * |
joehw@2102 | 17 | * Unless required by applicable law or agreed to in writing, software |
joehw@2102 | 18 | * distributed under the License is distributed on an "AS IS" BASIS, |
joehw@2102 | 19 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
joehw@2102 | 20 | * See the License for the specific language governing permissions and |
joehw@2102 | 21 | * limitations under the License. |
duke@1 | 22 | * |
duke@1 | 23 | */ |
duke@1 | 24 | |
duke@1 | 25 | import com.sun.org.apache.bcel.internal.Constants; |
duke@1 | 26 | import com.sun.org.apache.bcel.internal.generic.*; |
joehw@2102 | 27 | import java.util.*; |
joehw@2102 | 28 | import java.util.regex.Matcher; |
joehw@2102 | 29 | import java.util.regex.Pattern; |
duke@1 | 30 | |
duke@1 | 31 | /** |
duke@1 | 32 | * InstructionFinder is a tool to search for given instructions patterns, |
duke@1 | 33 | * i.e., match sequences of instructions in an instruction list via |
duke@1 | 34 | * regular expressions. This can be used, e.g., in order to implement |
duke@1 | 35 | * a peep hole optimizer that looks for code patterns and replaces |
duke@1 | 36 | * them with faster equivalents. |
duke@1 | 37 | * |
duke@1 | 38 | * <p>This class internally uses the <a href="http://jakarta.apache.org/regexp/"> |
duke@1 | 39 | * Regexp</a> package to search for regular expressions. |
duke@1 | 40 | * |
duke@1 | 41 | * A typical application would look like this: |
duke@1 | 42 | <pre> |
duke@1 | 43 | InstructionFinder f = new InstructionFinder(il); |
duke@1 | 44 | String pat = "IfInstruction ICONST_0 GOTO ICONST_1 NOP (IFEQ|IFNE)"; |
duke@1 | 45 | |
duke@1 | 46 | for(Iterator i = f.search(pat, constraint); i.hasNext(); ) { |
duke@1 | 47 | InstructionHandle[] match = (InstructionHandle[])i.next(); |
duke@1 | 48 | ... |
duke@1 | 49 | il.delete(match[1], match[5]); |
duke@1 | 50 | ... |
duke@1 | 51 | } |
duke@1 | 52 | </pre> |
duke@1 | 53 | * @author <A HREF="http://www.berlin.de/~markus.dahm/">M. Dahm</A> |
duke@1 | 54 | * @see Instruction |
duke@1 | 55 | * @see InstructionList |
duke@1 | 56 | */ |
duke@1 | 57 | public class InstructionFinder { |
duke@1 | 58 | private static final int OFFSET = 32767; // char + OFFSET is outside of LATIN-1 |
duke@1 | 59 | private static final int NO_OPCODES = 256; // Potential number, some are not used |
duke@1 | 60 | |
duke@1 | 61 | private static final HashMap map = new HashMap(); // Map<String,Pattern> |
duke@1 | 62 | |
duke@1 | 63 | private InstructionList il; |
duke@1 | 64 | private String il_string; // instruction list as string |
duke@1 | 65 | private InstructionHandle[] handles; // map instruction list to array |
duke@1 | 66 | |
duke@1 | 67 | /** |
duke@1 | 68 | * @param il instruction list to search for given patterns |
duke@1 | 69 | */ |
duke@1 | 70 | public InstructionFinder(InstructionList il) { |
duke@1 | 71 | this.il = il; |
duke@1 | 72 | reread(); |
duke@1 | 73 | } |
duke@1 | 74 | |
duke@1 | 75 | /** |
duke@1 | 76 | * Reread the instruction list, e.g., after you've altered the list upon a match. |
duke@1 | 77 | */ |
duke@1 | 78 | public final void reread() { |
duke@1 | 79 | int size = il.getLength(); |
duke@1 | 80 | char[] buf = new char[size]; // Create a string with length equal to il length |
duke@1 | 81 | handles = il.getInstructionHandles(); |
duke@1 | 82 | |
duke@1 | 83 | // Map opcodes to characters |
duke@1 | 84 | for(int i=0; i < size; i++) |
duke@1 | 85 | buf[i] = makeChar(handles[i].getInstruction().getOpcode()); |
duke@1 | 86 | |
duke@1 | 87 | il_string = new String(buf); |
duke@1 | 88 | } |
duke@1 | 89 | |
duke@1 | 90 | /** |
duke@1 | 91 | * Map symbolic instruction names like "getfield" to a single character. |
duke@1 | 92 | * |
duke@1 | 93 | * @param pattern instruction pattern in lower case |
duke@1 | 94 | * @return encoded string for a pattern such as "BranchInstruction". |
duke@1 | 95 | */ |
duke@1 | 96 | private static final String mapName(String pattern) { |
duke@1 | 97 | String result = (String)map.get(pattern); |
duke@1 | 98 | |
duke@1 | 99 | if(result != null) |
duke@1 | 100 | return result; |
duke@1 | 101 | |
duke@1 | 102 | for(short i=0; i < NO_OPCODES; i++) |
duke@1 | 103 | if(pattern.equals(Constants.OPCODE_NAMES[i])) |
duke@1 | 104 | return "" + makeChar(i); |
duke@1 | 105 | |
duke@1 | 106 | throw new RuntimeException("Instruction unknown: " + pattern); |
duke@1 | 107 | } |
duke@1 | 108 | |
duke@1 | 109 | /** |
duke@1 | 110 | * Replace symbolic names of instructions with the appropiate character and remove |
duke@1 | 111 | * all white space from string. Meta characters such as +, * are ignored. |
duke@1 | 112 | * |
duke@1 | 113 | * @param pattern The pattern to compile |
duke@1 | 114 | * @return translated regular expression string |
duke@1 | 115 | */ |
duke@1 | 116 | private static final String compilePattern(String pattern) { |
duke@1 | 117 | String lower = pattern.toLowerCase(); |
duke@1 | 118 | StringBuffer buf = new StringBuffer(); |
duke@1 | 119 | int size = pattern.length(); |
duke@1 | 120 | |
duke@1 | 121 | for(int i=0; i < size; i++) { |
duke@1 | 122 | char ch = lower.charAt(i); |
duke@1 | 123 | |
duke@1 | 124 | if(Character.isLetterOrDigit(ch)) { |
duke@1 | 125 | StringBuffer name = new StringBuffer(); |
duke@1 | 126 | |
duke@1 | 127 | while((Character.isLetterOrDigit(ch) || ch == '_') && i < size) { |
duke@1 | 128 | name.append(ch); |
duke@1 | 129 | |
duke@1 | 130 | if(++i < size) |
duke@1 | 131 | ch = lower.charAt(i); |
duke@1 | 132 | else |
duke@1 | 133 | break; |
duke@1 | 134 | } |
duke@1 | 135 | |
duke@1 | 136 | i--; |
duke@1 | 137 | |
duke@1 | 138 | buf.append(mapName(name.toString())); |
duke@1 | 139 | } else if(!Character.isWhitespace(ch)) |
duke@1 | 140 | buf.append(ch); |
duke@1 | 141 | } |
duke@1 | 142 | |
duke@1 | 143 | return buf.toString(); |
duke@1 | 144 | } |
duke@1 | 145 | |
duke@1 | 146 | /** |
duke@1 | 147 | * @return the matched piece of code as an array of instruction (handles) |
duke@1 | 148 | */ |
duke@1 | 149 | private InstructionHandle[] getMatch(int matched_from, int match_length) { |
duke@1 | 150 | InstructionHandle[] match = new InstructionHandle[match_length]; |
duke@1 | 151 | System.arraycopy(handles, matched_from, match, 0, match_length); |
duke@1 | 152 | |
duke@1 | 153 | return match; |
duke@1 | 154 | } |
duke@1 | 155 | |
duke@1 | 156 | /** |
duke@1 | 157 | * Search for the given pattern in the instruction list. You can search for any valid |
duke@1 | 158 | * opcode via its symbolic name, e.g. "istore". You can also use a super class or |
duke@1 | 159 | * an interface name to match a whole set of instructions, e.g. "BranchInstruction" or |
duke@1 | 160 | * "LoadInstruction". "istore" is also an alias for all "istore_x" instructions. Additional |
duke@1 | 161 | * aliases are "if" for "ifxx", "if_icmp" for "if_icmpxx", "if_acmp" for "if_acmpxx". |
duke@1 | 162 | * |
duke@1 | 163 | * Consecutive instruction names must be separated by white space which will be removed |
duke@1 | 164 | * during the compilation of the pattern. |
duke@1 | 165 | * |
duke@1 | 166 | * For the rest the usual pattern matching rules for regular expressions apply.<P> |
duke@1 | 167 | * Example pattern: |
duke@1 | 168 | * <pre> |
duke@1 | 169 | search("BranchInstruction NOP ((IfInstruction|GOTO)+ ISTORE Instruction)*"); |
duke@1 | 170 | * </pre> |
duke@1 | 171 | * |
duke@1 | 172 | * <p>If you alter the instruction list upon a match such that other |
duke@1 | 173 | * matching areas are affected, you should call reread() to update |
duke@1 | 174 | * the finder and call search() again, because the matches are cached. |
duke@1 | 175 | * |
duke@1 | 176 | * @param pattern the instruction pattern to search for, where case is ignored |
duke@1 | 177 | * @param from where to start the search in the instruction list |
duke@1 | 178 | * @param constraint optional CodeConstraint to check the found code pattern for |
duke@1 | 179 | * user-defined constraints |
duke@1 | 180 | * @return iterator of matches where e.nextElement() returns an array of instruction handles |
duke@1 | 181 | * describing the matched area |
duke@1 | 182 | */ |
duke@1 | 183 | public final Iterator search(String pattern, InstructionHandle from, |
duke@1 | 184 | CodeConstraint constraint) |
duke@1 | 185 | { |
duke@1 | 186 | String search = compilePattern(pattern); |
duke@1 | 187 | int start = -1; |
duke@1 | 188 | |
duke@1 | 189 | for(int i=0; i < handles.length; i++) { |
duke@1 | 190 | if(handles[i] == from) { |
duke@1 | 191 | start = i; // Where to start search from (index) |
duke@1 | 192 | break; |
duke@1 | 193 | } |
duke@1 | 194 | } |
duke@1 | 195 | |
duke@1 | 196 | if(start == -1) |
duke@1 | 197 | throw new ClassGenException("Instruction handle " + from + |
duke@1 | 198 | " not found in instruction list."); |
duke@1 | 199 | |
joehw@2102 | 200 | Pattern regex = Pattern.compile(search); |
joehw@2102 | 201 | List<InstructionHandle[]> matches = new ArrayList<>(); |
joehw@2102 | 202 | Matcher matcher = regex.matcher(il_string); |
joehw@2102 | 203 | while(start < il_string.length() && matcher.find(start)) { |
joehw@2102 | 204 | int startExpr = matcher.start(); |
joehw@2102 | 205 | int endExpr = matcher.end(); |
joehw@2102 | 206 | int lenExpr = endExpr - startExpr; |
joehw@2102 | 207 | InstructionHandle[] match = getMatch(startExpr, lenExpr); |
duke@1 | 208 | |
joehw@2102 | 209 | if((constraint == null) || constraint.checkCode(match)) |
joehw@2102 | 210 | matches.add(match); |
joehw@2102 | 211 | start = endExpr; |
duke@1 | 212 | } |
duke@1 | 213 | |
joehw@2102 | 214 | return matches.iterator(); |
duke@1 | 215 | } |
duke@1 | 216 | |
duke@1 | 217 | /** |
duke@1 | 218 | * Start search beginning from the start of the given instruction list. |
duke@1 | 219 | * |
duke@1 | 220 | * @param pattern the instruction pattern to search for, where case is ignored |
duke@1 | 221 | * @return iterator of matches where e.nextElement() |
duke@1 | 222 | * returns an array of instruction handles describing the matched |
duke@1 | 223 | * area |
duke@1 | 224 | */ |
duke@1 | 225 | public final Iterator search(String pattern) { |
duke@1 | 226 | return search(pattern, il.getStart(), null); |
duke@1 | 227 | } |
duke@1 | 228 | |
duke@1 | 229 | /** |
duke@1 | 230 | * Start search beginning from `from'. |
duke@1 | 231 | * |
duke@1 | 232 | * @param pattern the instruction pattern to search for, where case is ignored |
duke@1 | 233 | * @param from where to start the search in the instruction list |
duke@1 | 234 | * @return iterator of matches where e.nextElement() returns an array of instruction handles |
duke@1 | 235 | * describing the matched area |
duke@1 | 236 | */ |
duke@1 | 237 | public final Iterator search(String pattern, InstructionHandle from) { |
duke@1 | 238 | return search(pattern, from, null); |
duke@1 | 239 | } |
duke@1 | 240 | |
duke@1 | 241 | /** |
duke@1 | 242 | * Start search beginning from the start of the given instruction list. |
duke@1 | 243 | * Check found matches with the constraint object. |
duke@1 | 244 | * |
duke@1 | 245 | * @param pattern the instruction pattern to search for, case is ignored |
duke@1 | 246 | * @param constraint constraints to be checked on matching code |
duke@1 | 247 | * @return instruction handle or `null' if the match failed |
duke@1 | 248 | */ |
duke@1 | 249 | public final Iterator search(String pattern, CodeConstraint constraint) { |
duke@1 | 250 | return search(pattern, il.getStart(), constraint); |
duke@1 | 251 | } |
duke@1 | 252 | |
duke@1 | 253 | /** |
duke@1 | 254 | * Convert opcode number to char. |
duke@1 | 255 | */ |
duke@1 | 256 | private static final char makeChar(short opcode) { |
duke@1 | 257 | return (char)(opcode + OFFSET); |
duke@1 | 258 | } |
duke@1 | 259 | |
duke@1 | 260 | /** |
duke@1 | 261 | * @return the inquired instruction list |
duke@1 | 262 | */ |
duke@1 | 263 | public final InstructionList getInstructionList() { return il; } |
duke@1 | 264 | |
duke@1 | 265 | /** |
duke@1 | 266 | * Code patterns found may be checked using an additional |
duke@1 | 267 | * user-defined constraint object whether they really match the needed criterion. |
duke@1 | 268 | * I.e., check constraints that can not expressed with regular expressions. |
duke@1 | 269 | * |
duke@1 | 270 | */ |
duke@1 | 271 | public interface CodeConstraint { |
duke@1 | 272 | /** |
duke@1 | 273 | * @param match array of instructions matching the requested pattern |
duke@1 | 274 | * @return true if the matched area is really useful |
duke@1 | 275 | */ |
duke@1 | 276 | public boolean checkCode(InstructionHandle[] match); |
duke@1 | 277 | } |
duke@1 | 278 | |
duke@1 | 279 | // Initialize pattern map |
duke@1 | 280 | |
duke@1 | 281 | static { |
duke@1 | 282 | map.put("arithmeticinstruction", "(irem|lrem|iand|ior|ineg|isub|lneg|fneg|fmul|ldiv|fadd|lxor|frem|idiv|land|ixor|ishr|fsub|lshl|fdiv|iadd|lor|dmul|lsub|ishl|imul|lmul|lushr|dneg|iushr|lshr|ddiv|drem|dadd|ladd|dsub)"); |
duke@1 | 283 | map.put("invokeinstruction", "(invokevirtual|invokeinterface|invokestatic|invokespecial)"); |
duke@1 | 284 | map.put("arrayinstruction", "(baload|aastore|saload|caload|fastore|lastore|iaload|castore|iastore|aaload|bastore|sastore|faload|laload|daload|dastore)"); |
duke@1 | 285 | map.put("gotoinstruction", "(goto|goto_w)"); |
duke@1 | 286 | map.put("conversioninstruction", "(d2l|l2d|i2s|d2i|l2i|i2b|l2f|d2f|f2i|i2d|i2l|f2d|i2c|f2l|i2f)"); |
duke@1 | 287 | map.put("localvariableinstruction", "(fstore|iinc|lload|dstore|dload|iload|aload|astore|istore|fload|lstore)"); |
duke@1 | 288 | map.put("loadinstruction", "(fload|dload|lload|iload|aload)"); |
duke@1 | 289 | map.put("fieldinstruction", "(getfield|putstatic|getstatic|putfield)"); |
duke@1 | 290 | map.put("cpinstruction", "(ldc2_w|invokeinterface|multianewarray|putstatic|instanceof|getstatic|checkcast|getfield|invokespecial|ldc_w|invokestatic|invokevirtual|putfield|ldc|new|anewarray)"); |
duke@1 | 291 | map.put("stackinstruction", "(dup2|swap|dup2_x2|pop|pop2|dup|dup2_x1|dup_x2|dup_x1)"); |
duke@1 | 292 | map.put("branchinstruction", "(ifle|if_acmpne|if_icmpeq|if_acmpeq|ifnonnull|goto_w|iflt|ifnull|if_icmpne|tableswitch|if_icmple|ifeq|if_icmplt|jsr_w|if_icmpgt|ifgt|jsr|goto|ifne|ifge|lookupswitch|if_icmpge)"); |
duke@1 | 293 | map.put("returninstruction", "(lreturn|ireturn|freturn|dreturn|areturn|return)"); |
duke@1 | 294 | map.put("storeinstruction", "(istore|fstore|dstore|astore|lstore)"); |
duke@1 | 295 | map.put("select", "(tableswitch|lookupswitch)"); |
duke@1 | 296 | map.put("ifinstruction", "(ifeq|ifgt|if_icmpne|if_icmpeq|ifge|ifnull|ifne|if_icmple|if_icmpge|if_acmpeq|if_icmplt|if_acmpne|ifnonnull|iflt|if_icmpgt|ifle)"); |
duke@1 | 297 | map.put("jsrinstruction", "(jsr|jsr_w)"); |
duke@1 | 298 | map.put("variablelengthinstruction", "(tableswitch|jsr|goto|lookupswitch)"); |
duke@1 | 299 | map.put("unconditionalbranch", "(goto|jsr|jsr_w|athrow|goto_w)"); |
duke@1 | 300 | map.put("constantpushinstruction", "(dconst|bipush|sipush|fconst|iconst|lconst)"); |
duke@1 | 301 | map.put("typedinstruction", "(imul|lsub|aload|fload|lor|new|aaload|fcmpg|iand|iaload|lrem|idiv|d2l|isub|dcmpg|dastore|ret|f2d|f2i|drem|iinc|i2c|checkcast|frem|lreturn|astore|lushr|daload|dneg|fastore|istore|lshl|ldiv|lstore|areturn|ishr|ldc_w|invokeinterface|aastore|lxor|ishl|l2d|i2f|return|faload|sipush|iushr|caload|instanceof|invokespecial|putfield|fmul|ireturn|laload|d2f|lneg|ixor|i2l|fdiv|lastore|multianewarray|i2b|getstatic|i2d|putstatic|fcmpl|saload|ladd|irem|dload|jsr_w|dconst|dcmpl|fsub|freturn|ldc|aconst_null|castore|lmul|ldc2_w|dadd|iconst|f2l|ddiv|dstore|land|jsr|anewarray|dmul|bipush|dsub|sastore|d2i|i2s|lshr|iadd|l2i|lload|bastore|fstore|fneg|iload|fadd|baload|fconst|ior|ineg|dreturn|l2f|lconst|getfield|invokevirtual|invokestatic|iastore)"); |
duke@1 | 302 | map.put("popinstruction", "(fstore|dstore|pop|pop2|astore|putstatic|istore|lstore)"); |
duke@1 | 303 | map.put("allocationinstruction", "(multianewarray|new|anewarray|newarray)"); |
duke@1 | 304 | map.put("indexedinstruction", "(lload|lstore|fload|ldc2_w|invokeinterface|multianewarray|astore|dload|putstatic|instanceof|getstatic|checkcast|getfield|invokespecial|dstore|istore|iinc|ldc_w|ret|fstore|invokestatic|iload|putfield|invokevirtual|ldc|new|aload|anewarray)"); |
duke@1 | 305 | map.put("pushinstruction", "(dup|lload|dup2|bipush|fload|ldc2_w|sipush|lconst|fconst|dload|getstatic|ldc_w|aconst_null|dconst|iload|ldc|iconst|aload)"); |
duke@1 | 306 | map.put("stackproducer", "(imul|lsub|aload|fload|lor|new|aaload|fcmpg|iand|iaload|lrem|idiv|d2l|isub|dcmpg|dup|f2d|f2i|drem|i2c|checkcast|frem|lushr|daload|dneg|lshl|ldiv|ishr|ldc_w|invokeinterface|lxor|ishl|l2d|i2f|faload|sipush|iushr|caload|instanceof|invokespecial|fmul|laload|d2f|lneg|ixor|i2l|fdiv|getstatic|i2b|swap|i2d|dup2|fcmpl|saload|ladd|irem|dload|jsr_w|dconst|dcmpl|fsub|ldc|arraylength|aconst_null|tableswitch|lmul|ldc2_w|iconst|dadd|f2l|ddiv|land|jsr|anewarray|dmul|bipush|dsub|d2i|newarray|i2s|lshr|iadd|lload|l2i|fneg|iload|fadd|baload|fconst|lookupswitch|ior|ineg|lconst|l2f|getfield|invokevirtual|invokestatic)"); |
duke@1 | 307 | map.put("stackconsumer", "(imul|lsub|lor|iflt|fcmpg|if_icmpgt|iand|ifeq|if_icmplt|lrem|ifnonnull|idiv|d2l|isub|dcmpg|dastore|if_icmpeq|f2d|f2i|drem|i2c|checkcast|frem|lreturn|astore|lushr|pop2|monitorexit|dneg|fastore|istore|lshl|ldiv|lstore|areturn|if_icmpge|ishr|monitorenter|invokeinterface|aastore|lxor|ishl|l2d|i2f|return|iushr|instanceof|invokespecial|fmul|ireturn|d2f|lneg|ixor|pop|i2l|ifnull|fdiv|lastore|i2b|if_acmpeq|ifge|swap|i2d|putstatic|fcmpl|ladd|irem|dcmpl|fsub|freturn|ifgt|castore|lmul|dadd|f2l|ddiv|dstore|land|if_icmpne|if_acmpne|dmul|dsub|sastore|ifle|d2i|i2s|lshr|iadd|l2i|bastore|fstore|fneg|fadd|ior|ineg|ifne|dreturn|l2f|if_icmple|getfield|invokevirtual|invokestatic|iastore)"); |
duke@1 | 308 | map.put("exceptionthrower", "(irem|lrem|laload|putstatic|baload|dastore|areturn|getstatic|ldiv|anewarray|iastore|castore|idiv|saload|lastore|fastore|putfield|lreturn|caload|getfield|return|aastore|freturn|newarray|instanceof|multianewarray|athrow|faload|iaload|aaload|dreturn|monitorenter|checkcast|bastore|arraylength|new|invokevirtual|sastore|ldc_w|ireturn|invokespecial|monitorexit|invokeinterface|ldc|invokestatic|daload)"); |
duke@1 | 309 | map.put("loadclass", "(multianewarray|invokeinterface|instanceof|invokespecial|putfield|checkcast|putstatic|invokevirtual|new|getstatic|invokestatic|getfield|anewarray)"); |
duke@1 | 310 | map.put("instructiontargeter", "(ifle|if_acmpne|if_icmpeq|if_acmpeq|ifnonnull|goto_w|iflt|ifnull|if_icmpne|tableswitch|if_icmple|ifeq|if_icmplt|jsr_w|if_icmpgt|ifgt|jsr|goto|ifne|ifge|lookupswitch|if_icmpge)"); |
duke@1 | 311 | |
duke@1 | 312 | // Some aliases |
duke@1 | 313 | map.put("if_icmp", "(if_icmpne|if_icmpeq|if_icmple|if_icmpge|if_icmplt|if_icmpgt)"); |
duke@1 | 314 | map.put("if_acmp", "(if_acmpeq|if_acmpne)"); |
duke@1 | 315 | map.put("if", "(ifeq|ifne|iflt|ifge|ifgt|ifle)"); |
duke@1 | 316 | |
duke@1 | 317 | // Precompile some aliases first |
duke@1 | 318 | map.put("iconst", precompile(Constants.ICONST_0, Constants.ICONST_5, Constants.ICONST_M1)); |
duke@1 | 319 | map.put("lconst", new String(new char[] { '(', makeChar(Constants.LCONST_0), '|', |
duke@1 | 320 | makeChar(Constants.LCONST_1), ')' })); |
duke@1 | 321 | map.put("dconst", new String(new char[] { '(', makeChar(Constants.DCONST_0), '|', |
duke@1 | 322 | makeChar(Constants.DCONST_1), ')' })); |
duke@1 | 323 | map.put("fconst", new String(new char[] { '(', makeChar(Constants.FCONST_0), '|', |
duke@1 | 324 | makeChar(Constants.FCONST_1), ')' })); |
duke@1 | 325 | |
duke@1 | 326 | map.put("iload", precompile(Constants.ILOAD_0, Constants.ILOAD_3, Constants.ILOAD)); |
duke@1 | 327 | map.put("dload", precompile(Constants.DLOAD_0, Constants.DLOAD_3, Constants.DLOAD)); |
duke@1 | 328 | map.put("fload", precompile(Constants.FLOAD_0, Constants.FLOAD_3, Constants.FLOAD)); |
duke@1 | 329 | map.put("aload", precompile(Constants.ALOAD_0, Constants.ALOAD_3, Constants.ALOAD)); |
duke@1 | 330 | |
duke@1 | 331 | map.put("istore", precompile(Constants.ISTORE_0, Constants.ISTORE_3, Constants.ISTORE)); |
duke@1 | 332 | map.put("dstore", precompile(Constants.DSTORE_0, Constants.DSTORE_3, Constants.DSTORE)); |
duke@1 | 333 | map.put("fstore", precompile(Constants.FSTORE_0, Constants.FSTORE_3, Constants.FSTORE)); |
duke@1 | 334 | map.put("astore", precompile(Constants.ASTORE_0, Constants.ASTORE_3, Constants.ASTORE)); |
duke@1 | 335 | |
duke@1 | 336 | // Compile strings |
duke@1 | 337 | |
duke@1 | 338 | for(Iterator i = map.keySet().iterator(); i.hasNext(); ) { |
duke@1 | 339 | String key = (String)i.next(); |
duke@1 | 340 | String value = (String)map.get(key); |
duke@1 | 341 | |
duke@1 | 342 | char ch = value.charAt(1); // Omit already precompiled patterns |
duke@1 | 343 | if(ch < OFFSET) { |
duke@1 | 344 | map.put(key, compilePattern(value)); // precompile all patterns |
duke@1 | 345 | } |
duke@1 | 346 | } |
duke@1 | 347 | |
duke@1 | 348 | // Add instruction alias to match anything |
duke@1 | 349 | |
duke@1 | 350 | StringBuffer buf = new StringBuffer("("); |
duke@1 | 351 | |
duke@1 | 352 | for(short i=0; i < NO_OPCODES; i++) { |
duke@1 | 353 | if(Constants.NO_OF_OPERANDS[i] != Constants.UNDEFINED) { // Not an invalid opcode |
duke@1 | 354 | buf.append(makeChar(i)); |
duke@1 | 355 | |
duke@1 | 356 | if(i < NO_OPCODES - 1) |
duke@1 | 357 | buf.append('|'); |
duke@1 | 358 | } |
duke@1 | 359 | } |
duke@1 | 360 | buf.append(')'); |
duke@1 | 361 | |
duke@1 | 362 | map.put("instruction", buf.toString()); |
duke@1 | 363 | } |
duke@1 | 364 | |
duke@1 | 365 | private static String precompile(short from, short to, short extra) { |
duke@1 | 366 | StringBuffer buf = new StringBuffer("("); |
duke@1 | 367 | |
duke@1 | 368 | for(short i=from; i <= to; i++) { |
duke@1 | 369 | buf.append(makeChar(i)); |
duke@1 | 370 | buf.append('|'); |
duke@1 | 371 | } |
duke@1 | 372 | |
duke@1 | 373 | buf.append(makeChar(extra)); |
duke@1 | 374 | buf.append(")"); |
duke@1 | 375 | return buf.toString(); |
duke@1 | 376 | } |
duke@1 | 377 | |
duke@1 | 378 | /* |
duke@1 | 379 | * Internal debugging routines. |
duke@1 | 380 | */ |
duke@1 | 381 | private static final String pattern2string(String pattern) { |
duke@1 | 382 | return pattern2string(pattern, true); |
duke@1 | 383 | } |
duke@1 | 384 | |
duke@1 | 385 | private static final String pattern2string(String pattern, boolean make_string) { |
duke@1 | 386 | StringBuffer buf = new StringBuffer(); |
duke@1 | 387 | |
duke@1 | 388 | for(int i=0; i < pattern.length(); i++) { |
duke@1 | 389 | char ch = pattern.charAt(i); |
duke@1 | 390 | |
duke@1 | 391 | if(ch >= OFFSET) { |
duke@1 | 392 | if(make_string) |
duke@1 | 393 | buf.append(Constants.OPCODE_NAMES[ch - OFFSET]); |
duke@1 | 394 | else |
duke@1 | 395 | buf.append((int)(ch - OFFSET)); |
duke@1 | 396 | } else |
duke@1 | 397 | buf.append(ch); |
duke@1 | 398 | } |
duke@1 | 399 | |
duke@1 | 400 | return buf.toString(); |
duke@1 | 401 | } |
duke@1 | 402 | } |