From 77fc441a07f557b271308614850310e64db0ff16 Mon Sep 17 00:00:00 2001 From: Graham Date: Mon, 29 Jul 2019 13:53:50 +0100 Subject: [PATCH] Add InsnMatcher 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. --- .../java/dev/openrs2/asm/InsnMatcher.java | 314 ++++++++++++++++++ 1 file changed, 314 insertions(+) create mode 100644 asm/src/main/java/dev/openrs2/asm/InsnMatcher.java diff --git a/asm/src/main/java/dev/openrs2/asm/InsnMatcher.java b/asm/src/main/java/dev/openrs2/asm/InsnMatcher.java new file mode 100644 index 00000000..65d4c06b --- /dev/null +++ b/asm/src/main/java/dev/openrs2/asm/InsnMatcher.java @@ -0,0 +1,314 @@ +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 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 createRealInsnList(InsnList list) { + List 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 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> match(MethodNode method) { + return match(method.instructions); + } + + public Stream> match(InsnList list) { + Stream.Builder> 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(); + } +}