Inline constants in DummyArgTransformer

This is a prerequisite for us to be able to remove the constant
arguments.
bzip2
Graham 5 years ago
parent 1216812c8a
commit 7b3ec975d9
  1. 45
      deob/src/main/java/dev/openrs2/deob/transform/DummyArgTransformer.java

@ -13,6 +13,7 @@ import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Multimap;
import dev.openrs2.asm.InsnNodeUtils;
import dev.openrs2.asm.MemberRef;
import dev.openrs2.asm.StackMetadata;
import dev.openrs2.asm.classpath.ClassPath;
import dev.openrs2.asm.transform.Transformer;
import dev.openrs2.deob.analysis.IntInterpreter;
@ -20,6 +21,7 @@ import dev.openrs2.deob.analysis.IntValue;
import dev.openrs2.util.collect.DisjointSet;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.JumpInsnNode;
import org.objectweb.asm.tree.MethodInsnNode;
@ -162,12 +164,13 @@ public final class DummyArgTransformer extends Transformer {
private final Multimap<ArgRef, IntValue> argValues = HashMultimap.create();
private final Map<DisjointSet.Partition<MemberRef>, ImmutableSet<Integer>[]> constArgs = new HashMap<>();
private DisjointSet<MemberRef> inheritedMethodSets;
private int branchesSimplified;
private int branchesSimplified, constantsInlined;
@Override
protected void preTransform(ClassPath classPath) {
inheritedMethodSets = classPath.createInheritedMethodSets();
branchesSimplified = 0;
constantsInlined = 0;
}
@Override
@ -189,6 +192,7 @@ public final class DummyArgTransformer extends Transformer {
var alwaysTakenBranches = new ArrayList<JumpInsnNode>();
var neverTakenBranches = new ArrayList<JumpInsnNode>();
var constInsns = new HashMap<AbstractInsnNode, Integer>();
for (var i = 0; i < frames.length; i++) {
var frame = frames[i];
@ -256,6 +260,30 @@ public final class DummyArgTransformer extends Transformer {
break;
}
break;
default:
if (InsnNodeUtils.hasSideEffects(insn) || InsnNodeUtils.isIntConstant(insn)) {
continue;
}
if (StackMetadata.get(insn).getPushes() != 1) {
continue;
}
var nextInsn = InsnNodeUtils.nextReal(insn);
if (nextInsn == null) {
continue;
}
var nextInsnIndex = method.instructions.indexOf(nextInsn);
var nextFrame = frames[nextInsnIndex];
value = nextFrame.getStack(nextFrame.getStackSize() - 1);
if (!value.isSingleConstant()) {
continue;
}
constInsns.put(insn, value.getIntValue());
break;
}
}
@ -273,6 +301,19 @@ public final class DummyArgTransformer extends Transformer {
}
}
for (var entry : constInsns.entrySet()) {
var insn = entry.getKey();
if (!method.instructions.contains(insn)) {
continue;
}
var replacement = InsnNodeUtils.createIntConstant(entry.getValue());
if (InsnNodeUtils.replaceSimpleExpression(method.instructions, insn, replacement)) {
constantsInlined++;
changed = true;
}
}
return changed;
}
@ -302,6 +343,6 @@ public final class DummyArgTransformer extends Transformer {
@Override
protected void postTransform(ClassPath classPath) {
logger.info("Simplified {} dummy branches", branchesSimplified);
logger.info("Simplified {} dummy branches and inlined {} constants", branchesSimplified, constantsInlined);
}
}

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