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Add InsnMatcher

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InsnMatcher converts an InsnList to a string of private use codepoints,
where each codepoint maps to an opcode. This allows regular expressions
to be written (using the native Java regular expression engine) to
extract subsequences of instructions whose opcodes match a regex.
pull/48/head
Graham 5 years ago
parent c6921fba9d
commit 77fc441a07
1 changed files with 314 additions and 0 deletions
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  1. 314
      asm/src/main/java/dev/openrs2/asm/InsnMatcher.java

314
asm/src/main/java/dev/openrs2/asm/InsnMatcher.java
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package dev.openrs2.asm;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
import java.util.stream.Stream;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.InsnList;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.util.Printer;
public final class InsnMatcher {
private static final int PRIVATE_USE_AREA = 0xE000;
private static final Map<String, int[]> OPCODE_GROUPS = Map.ofEntries(
Map.entry("InsnNode", new int[] {
Opcodes.NOP,
Opcodes.ACONST_NULL,
Opcodes.ICONST_M1,
Opcodes.ICONST_0,
Opcodes.ICONST_1,
Opcodes.ICONST_2,
Opcodes.ICONST_3,
Opcodes.ICONST_4,
Opcodes.ICONST_5,
Opcodes.LCONST_0,
Opcodes.LCONST_1,
Opcodes.FCONST_0,
Opcodes.FCONST_1,
Opcodes.FCONST_2,
Opcodes.DCONST_0,
Opcodes.DCONST_1,
Opcodes.IALOAD,
Opcodes.LALOAD,
Opcodes.FALOAD,
Opcodes.DALOAD,
Opcodes.AALOAD,
Opcodes.BALOAD,
Opcodes.CALOAD,
Opcodes.SALOAD,
Opcodes.IASTORE,
Opcodes.LASTORE,
Opcodes.FASTORE,
Opcodes.DASTORE,
Opcodes.AASTORE,
Opcodes.BASTORE,
Opcodes.CASTORE,
Opcodes.SASTORE,
Opcodes.POP,
Opcodes.POP2,
Opcodes.DUP,
Opcodes.DUP_X1,
Opcodes.DUP_X2,
Opcodes.DUP2,
Opcodes.DUP2_X1,
Opcodes.DUP2_X2,
Opcodes.SWAP,
Opcodes.IADD,
Opcodes.LADD,
Opcodes.FADD,
Opcodes.DADD,
Opcodes.ISUB,
Opcodes.LSUB,
Opcodes.FSUB,
Opcodes.DSUB,
Opcodes.IMUL,
Opcodes.LMUL,
Opcodes.FMUL,
Opcodes.DMUL,
Opcodes.IDIV,
Opcodes.LDIV,
Opcodes.FDIV,
Opcodes.DDIV,
Opcodes.IREM,
Opcodes.LREM,
Opcodes.FREM,
Opcodes.DREM,
Opcodes.INEG,
Opcodes.LNEG,
Opcodes.FNEG,
Opcodes.DNEG,
Opcodes.ISHL,
Opcodes.LSHL,
Opcodes.ISHR,
Opcodes.LSHR,
Opcodes.IUSHR,
Opcodes.LUSHR,
Opcodes.IAND,
Opcodes.LAND,
Opcodes.IOR,
Opcodes.LOR,
Opcodes.IXOR,
Opcodes.LXOR,
Opcodes.I2L,
Opcodes.I2F,
Opcodes.I2D,
Opcodes.L2I,
Opcodes.L2F,
Opcodes.L2D,
Opcodes.F2I,
Opcodes.F2L,
Opcodes.F2D,
Opcodes.D2I,
Opcodes.D2L,
Opcodes.D2F,
Opcodes.I2B,
Opcodes.I2C,
Opcodes.I2S,
Opcodes.LCMP,
Opcodes.FCMPL,
Opcodes.FCMPG,
Opcodes.DCMPL,
Opcodes.DCMPG,
Opcodes.IRETURN,
Opcodes.LRETURN,
Opcodes.FRETURN,
Opcodes.DRETURN,
Opcodes.ARETURN,
Opcodes.RETURN,
Opcodes.ARRAYLENGTH,
Opcodes.ATHROW,
Opcodes.MONITORENTER,
Opcodes.MONITOREXIT
}),
Map.entry("IntInsnNode", new int[] {
Opcodes.BIPUSH,
Opcodes.SIPUSH,
Opcodes.NEWARRAY
}),
Map.entry("VarInsnNode", new int[] {
Opcodes.ILOAD,
Opcodes.LLOAD,
Opcodes.FLOAD,
Opcodes.DLOAD,
Opcodes.ALOAD,
Opcodes.ISTORE,
Opcodes.LSTORE,
Opcodes.FSTORE,
Opcodes.DSTORE,
Opcodes.ASTORE,
Opcodes.RET
}),
Map.entry("TypeInsnNode", new int[] {
Opcodes.NEW,
Opcodes.ANEWARRAY,
Opcodes.CHECKCAST,
Opcodes.INSTANCEOF
}),
Map.entry("FieldInsnNode", new int[] {
Opcodes.GETSTATIC,
Opcodes.PUTSTATIC,
Opcodes.GETFIELD,
Opcodes.PUTFIELD
}),
Map.entry("MethodInsnNode", new int[] {
Opcodes.INVOKEVIRTUAL,
Opcodes.INVOKESPECIAL,
Opcodes.INVOKESTATIC,
Opcodes.INVOKEINTERFACE
}),
Map.entry("InvokeDynamicInsnNode", new int[] {
Opcodes.INVOKEDYNAMIC
}),
Map.entry("JumpInsnNode", new int[] {
Opcodes.IFEQ,
Opcodes.IFNE,
Opcodes.IFLT,
Opcodes.IFGE,
Opcodes.IFGT,
Opcodes.IFLE,
Opcodes.IF_ICMPEQ,
Opcodes.IF_ICMPNE,
Opcodes.IF_ICMPLT,
Opcodes.IF_ICMPGE,
Opcodes.IF_ICMPGT,
Opcodes.IF_ICMPLE,
Opcodes.IF_ACMPEQ,
Opcodes.IF_ACMPNE,
Opcodes.GOTO,
Opcodes.JSR,
Opcodes.IFNULL,
Opcodes.IFNONNULL
}),
Map.entry("LdcInsnNode", new int[] {
Opcodes.LDC
}),
Map.entry("IincInsnNode", new int[] {
Opcodes.IINC
}),
Map.entry("TableSwitchInsnNode", new int[] {
Opcodes.TABLESWITCH
}),
Map.entry("LookupSwitchInsnNode", new int[] {
Opcodes.LOOKUPSWITCH
}),
Map.entry("MultiANewArrayInsnNode", new int[] {
Opcodes.MULTIANEWARRAY
}),
Map.entry("ICONST", new int[] {
Opcodes.ICONST_M1,
Opcodes.ICONST_0,
Opcodes.ICONST_1,
Opcodes.ICONST_2,
Opcodes.ICONST_3,
Opcodes.ICONST_4,
Opcodes.ICONST_5
})
);
private static char opcodeToCodepoint(int opcode) {
return (char) (PRIVATE_USE_AREA + opcode);
}
private static List<AbstractInsnNode> createRealInsnList(InsnList list) {
List<AbstractInsnNode> realInsns = new ArrayList<>();
for (var insn = list.getFirst(); insn != null; insn = insn.getNext()) {
if (insn.getOpcode() != -1) {
realInsns.add(insn);
}
}
return realInsns;
}
private static String createCodepointSeq(List<AbstractInsnNode> insns) {
var codepoints = new char[insns.size()];
for (var i = 0; i < codepoints.length; i++) {
codepoints[i] = opcodeToCodepoint(insns.get(i).getOpcode());
}
return new String(codepoints);
}
public static InsnMatcher compile(String expr) {
var pattern = new StringBuilder();
var opcode = new StringBuilder();
for (var i = 0; i < expr.length(); i++) {
var c = expr.charAt(i);
if (Character.isLetterOrDigit(c) || c == '_') {
opcode.append(c);
} else {
if (opcode.length() > 0) {
appendOpcodeRegex(pattern, opcode.toString());
opcode.delete(0, opcode.length());
}
if (!Character.isWhitespace(c)) {
pattern.append(c);
}
}
}
if (opcode.length() > 0) {
appendOpcodeRegex(pattern, opcode.toString());
}
return new InsnMatcher(Pattern.compile(pattern.toString()));
}
private static void appendOpcodeRegex(StringBuilder pattern, String opcode) {
for (var i = 0; i < Printer.OPCODES.length; i++) {
if (opcode.equals(Printer.OPCODES[i])) {
pattern.append(opcodeToCodepoint(i));
return;
}
}
var group = OPCODE_GROUPS.get(opcode);
if (group != null) {
pattern.append('(');
for (var i = 0; i < group.length; i++) {
pattern.append(opcodeToCodepoint(group[i]));
if (i != group.length - 1) {
pattern.append('|');
}
}
pattern.append(')');
return;
}
if (opcode.equals("AbstractInsnNode")) {
pattern.append('.');
return;
}
throw new IllegalArgumentException(opcode + " is not a valid opcode or opcode group");
}
private final Pattern pattern;
private InsnMatcher(Pattern pattern) {
this.pattern = pattern;
}
public Stream<List<AbstractInsnNode>> match(MethodNode method) {
return match(method.instructions);
}
public Stream<List<AbstractInsnNode>> match(InsnList list) {
Stream.Builder<List<AbstractInsnNode>> matches = Stream.builder();
var insns = createRealInsnList(list);
var matcher = pattern.matcher(createCodepointSeq(insns));
while (matcher.find()) {
var start = matcher.start();
var end = matcher.end();
matches.add(Collections.unmodifiableList(insns.subList(start, end)));
}
return matches.build();
}
}
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