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openrs2
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Add StackMetadata

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I'm not yet sure if I'm going to need to use this, but I want to get it
in the repository so I have a copy of it for the future (this is already
the second time I've written something similar to it!)
master
Graham 5 years ago
parent 5d2fd11128
commit 176b109688
1 changed files with 352 additions and 0 deletions
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  1. 352
      asm/src/main/java/dev/openrs2/asm/StackMetadata.java

352
asm/src/main/java/dev/openrs2/asm/StackMetadata.java
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@ -0,0 +1,352 @@
package dev.openrs2.asm;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.FieldInsnNode;
import org.objectweb.asm.tree.LdcInsnNode;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.MultiANewArrayInsnNode;
public final class StackMetadata {
private static final StackMetadata NONE = new StackMetadata(0, 0);
private static final StackMetadata POP1 = new StackMetadata(1, 0);
private static final StackMetadata POP1_PUSH1 = new StackMetadata(1, 1);
private static final StackMetadata POP1_PUSH2 = new StackMetadata(1, 2);
private static final StackMetadata POP2 = new StackMetadata(2, 0);
private static final StackMetadata POP2_PUSH1 = new StackMetadata(2, 1);
private static final StackMetadata POP2_PUSH2 = new StackMetadata(2, 2);
private static final StackMetadata POP2_PUSH3 = new StackMetadata(2, 3);
private static final StackMetadata POP2_PUSH4 = new StackMetadata(2, 4);
private static final StackMetadata POP3 = new StackMetadata(3, 0);
private static final StackMetadata POP3_PUSH2 = new StackMetadata(3, 2);
private static final StackMetadata POP3_PUSH4 = new StackMetadata(3, 4);
private static final StackMetadata POP3_PUSH5 = new StackMetadata(3, 5);
private static final StackMetadata POP4 = new StackMetadata(4, 0);
private static final StackMetadata POP4_PUSH1 = new StackMetadata(4, 1);
private static final StackMetadata POP4_PUSH2 = new StackMetadata(4, 2);
private static final StackMetadata POP4_PUSH6 = new StackMetadata(4, 6);
private static final StackMetadata PUSH1 = new StackMetadata(0, 1);
private static final StackMetadata PUSH2 = new StackMetadata(0, 2);
public static StackMetadata get(AbstractInsnNode insn) {
var opcode = insn.getOpcode();
switch (opcode) {
case Opcodes.NOP:
return NONE;
case Opcodes.ACONST_NULL:
case Opcodes.ICONST_M1:
case Opcodes.ICONST_0:
case Opcodes.ICONST_1:
case Opcodes.ICONST_2:
case Opcodes.ICONST_3:
case Opcodes.ICONST_4:
case Opcodes.ICONST_5:
return PUSH1;
case Opcodes.LCONST_0:
case Opcodes.LCONST_1:
return PUSH2;
case Opcodes.FCONST_0:
case Opcodes.FCONST_1:
case Opcodes.FCONST_2:
return PUSH1;
case Opcodes.DCONST_0:
case Opcodes.DCONST_1:
return PUSH2;
case Opcodes.BIPUSH:
case Opcodes.SIPUSH:
return PUSH1;
case Opcodes.LDC:
var cst = ((LdcInsnNode) insn).cst;
if (cst instanceof Double || cst instanceof Long) {
return PUSH2;
} else {
return PUSH1;
}
case Opcodes.ILOAD:
return PUSH1;
case Opcodes.LLOAD:
return PUSH2;
case Opcodes.FLOAD:
return PUSH1;
case Opcodes.DLOAD:
return PUSH2;
case Opcodes.ALOAD:
return PUSH1;
case Opcodes.IALOAD:
return POP2_PUSH1;
case Opcodes.LALOAD:
return POP2_PUSH2;
case Opcodes.FALOAD:
return POP2_PUSH1;
case Opcodes.DALOAD:
return POP2_PUSH2;
case Opcodes.AALOAD:
case Opcodes.BALOAD:
case Opcodes.CALOAD:
case Opcodes.SALOAD:
return POP2_PUSH1;
case Opcodes.ISTORE:
return POP1;
case Opcodes.LSTORE:
return POP2;
case Opcodes.FSTORE:
return POP1;
case Opcodes.DSTORE:
return POP2;
case Opcodes.ASTORE:
return POP1;
case Opcodes.IASTORE:
return POP3;
case Opcodes.LASTORE:
return POP4;
case Opcodes.FASTORE:
return POP3;
case Opcodes.DASTORE:
return POP4;
case Opcodes.AASTORE:
case Opcodes.BASTORE:
case Opcodes.CASTORE:
case Opcodes.SASTORE:
return POP3;
case Opcodes.POP:
return POP1;
case Opcodes.POP2:
return POP2;
case Opcodes.DUP:
return POP1_PUSH2;
case Opcodes.DUP_X1:
return POP2_PUSH3;
case Opcodes.DUP_X2:
return POP3_PUSH4;
case Opcodes.DUP2:
return POP2_PUSH4;
case Opcodes.DUP2_X1:
return POP3_PUSH5;
case Opcodes.DUP2_X2:
return POP4_PUSH6;
case Opcodes.SWAP:
return POP2_PUSH2;
case Opcodes.IADD:
return POP2_PUSH1;
case Opcodes.LADD:
return POP4_PUSH2;
case Opcodes.FADD:
return POP2_PUSH1;
case Opcodes.DADD:
return POP4_PUSH2;
case Opcodes.ISUB:
return POP2_PUSH1;
case Opcodes.LSUB:
return POP4_PUSH2;
case Opcodes.FSUB:
return POP2_PUSH1;
case Opcodes.DSUB:
return POP4_PUSH2;
case Opcodes.IMUL:
return POP2_PUSH1;
case Opcodes.LMUL:
return POP4_PUSH2;
case Opcodes.FMUL:
return POP2_PUSH1;
case Opcodes.DMUL:
return POP4_PUSH2;
case Opcodes.IDIV:
return POP2_PUSH1;
case Opcodes.LDIV:
return POP4_PUSH2;
case Opcodes.FDIV:
return POP2_PUSH1;
case Opcodes.DDIV:
return POP4_PUSH2;
case Opcodes.IREM:
return POP2_PUSH1;
case Opcodes.LREM:
return POP4_PUSH2;
case Opcodes.FREM:
return POP2_PUSH1;
case Opcodes.DREM:
return POP4_PUSH2;
case Opcodes.INEG:
return POP1_PUSH1;
case Opcodes.LNEG:
return POP2_PUSH2;
case Opcodes.FNEG:
return POP1_PUSH1;
case Opcodes.DNEG:
return POP2_PUSH2;
case Opcodes.ISHL:
return POP2_PUSH1;
case Opcodes.LSHL:
return POP3_PUSH2;
case Opcodes.ISHR:
return POP2_PUSH1;
case Opcodes.LSHR:
return POP3_PUSH2;
case Opcodes.IUSHR:
return POP2_PUSH1;
case Opcodes.LUSHR:
return POP3_PUSH2;
case Opcodes.IAND:
return POP2_PUSH1;
case Opcodes.LAND:
return POP4_PUSH2;
case Opcodes.IOR:
return POP2_PUSH1;
case Opcodes.LOR:
return POP4_PUSH2;
case Opcodes.IXOR:
return POP2_PUSH1;
case Opcodes.LXOR:
return POP4_PUSH2;
case Opcodes.IINC:
return NONE;
case Opcodes.I2L:
return POP1_PUSH2;
case Opcodes.I2F:
return POP1_PUSH1;
case Opcodes.I2D:
return POP1_PUSH2;
case Opcodes.L2I:
return POP2_PUSH1;
case Opcodes.L2F:
return POP2_PUSH1;
case Opcodes.L2D:
return POP2_PUSH2;
case Opcodes.F2I:
return POP1_PUSH1;
case Opcodes.F2L:
return POP1_PUSH2;
case Opcodes.F2D:
return POP1_PUSH2;
case Opcodes.D2I:
return POP2_PUSH1;
case Opcodes.D2L:
return POP2_PUSH2;
case Opcodes.D2F:
return POP2_PUSH1;
case Opcodes.I2B:
case Opcodes.I2C:
case Opcodes.I2S:
return POP1_PUSH1;
case Opcodes.LCMP:
return POP4_PUSH1;
case Opcodes.FCMPL:
case Opcodes.FCMPG:
return POP2_PUSH1;
case Opcodes.DCMPL:
case Opcodes.DCMPG:
return POP4_PUSH1;
case Opcodes.IFEQ:
case Opcodes.IFNE:
case Opcodes.IFLT:
case Opcodes.IFGE:
case Opcodes.IFGT:
case Opcodes.IFLE:
return POP1;
case Opcodes.IF_ICMPEQ:
case Opcodes.IF_ICMPNE:
case Opcodes.IF_ICMPLT:
case Opcodes.IF_ICMPGE:
case Opcodes.IF_ICMPGT:
case Opcodes.IF_ICMPLE:
case Opcodes.IF_ACMPEQ:
case Opcodes.IF_ACMPNE:
return POP2;
case Opcodes.GOTO:
return NONE;
case Opcodes.JSR:
return PUSH1;
case Opcodes.RET:
return NONE;
case Opcodes.TABLESWITCH:
case Opcodes.LOOKUPSWITCH:
return POP1;
case Opcodes.IRETURN:
return POP1;
case Opcodes.LRETURN:
return POP2;
case Opcodes.FRETURN:
return POP1;
case Opcodes.DRETURN:
return POP2;
case Opcodes.ARETURN:
return POP1;
case Opcodes.RETURN:
return NONE;
case Opcodes.GETSTATIC:
case Opcodes.PUTSTATIC:
case Opcodes.GETFIELD:
case Opcodes.PUTFIELD:
var fieldInsn = (FieldInsnNode) insn;
var fieldSize = Type.getType(fieldInsn.desc).getSize();
int pushes = 0, pops = 0;
if (opcode == Opcodes.GETFIELD || opcode == Opcodes.PUTFIELD) {
pops++;
}
if (opcode == Opcodes.PUTFIELD || opcode == Opcodes.PUTSTATIC) {
pushes += fieldSize;
} else {
pops += fieldSize;
}
return new StackMetadata(pops, pushes);
case Opcodes.INVOKEVIRTUAL:
case Opcodes.INVOKESPECIAL:
case Opcodes.INVOKESTATIC:
case Opcodes.INVOKEINTERFACE:
var methodInsn = (MethodInsnNode) insn;
var argumentsAndReturnSizes = Type.getArgumentsAndReturnSizes(methodInsn.desc);
pushes = argumentsAndReturnSizes >> 2;
pops = argumentsAndReturnSizes & 0x3;
if (opcode != Opcodes.INVOKESTATIC) {
pops++;
}
return new StackMetadata(pops, pushes);
case Opcodes.INVOKEDYNAMIC:
throw new UnsupportedOperationException();
case Opcodes.NEW:
return POP1;
case Opcodes.NEWARRAY:
case Opcodes.ANEWARRAY:
case Opcodes.ARRAYLENGTH:
return POP1_PUSH1;
case Opcodes.ATHROW:
return POP1;
case Opcodes.CHECKCAST:
case Opcodes.INSTANCEOF:
return POP1_PUSH1;
case Opcodes.MONITORENTER:
case Opcodes.MONITOREXIT:
return POP1;
case Opcodes.MULTIANEWARRAY:
return new StackMetadata(((MultiANewArrayInsnNode) insn).dims, 1);
case Opcodes.IFNULL:
case Opcodes.IFNONNULL:
return POP1;
}
throw new IllegalArgumentException();
}
private final int pops, pushes;
private StackMetadata(int pops, int pushes) {
this.pops = pops;
this.pushes = pushes;
}
public int getPops() {
return pops;
}
public int getPushes() {
return pushes;
}
}
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