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Code Issues 7 Pull Requests Releases Activity

minor cleanup: avoid creating empty arrays and unneeded boxing

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master
Egor.Ushakov 7 years ago
parent 5de2e5b11b
commit 2fab291fe1
1 changed files with 34 additions and 31 deletions
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  1. 65
      src/org/jetbrains/java/decompiler/struct/StructMethod.java

65
src/org/jetbrains/java/decompiler/struct/StructMethod.java
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@ -141,26 +141,26 @@ public class StructMethod extends StructMember {
List<Integer> operands = new ArrayList<>();
if (opcode >= opc_iconst_m1 && opcode <= opc_iconst_5) {
operands.add(new Integer(opr_iconst[opcode - opc_iconst_m1]));
operands.add(opr_iconst[opcode - opc_iconst_m1]);
opcode = opc_bipush;
}
else if (opcode >= opc_iload_0 && opcode <= opc_aload_3) {
operands.add(new Integer(opr_loadstore[opcode - opc_iload_0]));
operands.add(opr_loadstore[opcode - opc_iload_0]);
opcode = opcs_load[(opcode - opc_iload_0) / 4];
}
else if (opcode >= opc_istore_0 && opcode <= opc_astore_3) {
operands.add(new Integer(opr_loadstore[opcode - opc_istore_0]));
operands.add(opr_loadstore[opcode - opc_istore_0]);
opcode = opcs_store[(opcode - opc_istore_0) / 4];
}
else {
switch (opcode) {
case opc_bipush:
operands.add(new Integer(in.readByte()));
operands.add(Integer.valueOf(in.readByte()));
i++;
break;
case opc_ldc:
case opc_newarray:
operands.add(new Integer(in.readUnsignedByte()));
operands.add(Integer.valueOf(in.readUnsignedByte()));
i++;
break;
case opc_sipush:
@ -185,7 +185,7 @@ public class StructMethod extends StructMember {
if (opcode != opc_sipush) {
group = GROUP_JUMP;
}
operands.add(new Integer(in.readShort()));
operands.add(Integer.valueOf(in.readShort()));
i += 2;
break;
case opc_ldc_w:
@ -201,7 +201,7 @@ public class StructMethod extends StructMember {
case opc_anewarray:
case opc_checkcast:
case opc_instanceof:
operands.add(new Integer(in.readUnsignedShort()));
operands.add(in.readUnsignedShort());
i += 2;
if (opcode >= opc_getstatic && opcode <= opc_putfield) {
group = GROUP_FIELDACCESS;
@ -212,7 +212,7 @@ public class StructMethod extends StructMember {
break;
case opc_invokedynamic:
if (classStruct.isVersionGE_1_7()) { // instruction unused in Java 6 and before
operands.add(new Integer(in.readUnsignedShort()));
operands.add(in.readUnsignedShort());
in.discard(2);
group = GROUP_INVOCATION;
i += 4;
@ -230,11 +230,11 @@ public class StructMethod extends StructMember {
case opc_astore:
case opc_ret:
if (wide) {
operands.add(new Integer(in.readUnsignedShort()));
operands.add(in.readUnsignedShort());
i += 2;
}
else {
operands.add(new Integer(in.readUnsignedByte()));
operands.add(in.readUnsignedByte());
i++;
}
if (opcode == opc_ret) {
@ -243,49 +243,49 @@ public class StructMethod extends StructMember {
break;
case opc_iinc:
if (wide) {
operands.add(new Integer(in.readUnsignedShort()));
operands.add(new Integer(in.readShort()));
operands.add(in.readUnsignedShort());
operands.add(Integer.valueOf(in.readShort()));
i += 4;
}
else {
operands.add(new Integer(in.readUnsignedByte()));
operands.add(new Integer(in.readByte()));
operands.add(in.readUnsignedByte());
operands.add(Integer.valueOf(in.readByte()));
i += 2;
}
break;
case opc_goto_w:
case opc_jsr_w:
opcode = opcode == opc_jsr_w ? opc_jsr : opc_goto;
operands.add(new Integer(in.readInt()));
operands.add(in.readInt());
group = GROUP_JUMP;
i += 4;
break;
case opc_invokeinterface:
operands.add(new Integer(in.readUnsignedShort()));
operands.add(new Integer(in.readUnsignedByte()));
operands.add(in.readUnsignedShort());
operands.add(in.readUnsignedByte());
in.discard(1);
group = GROUP_INVOCATION;
i += 4;
break;
case opc_multianewarray:
operands.add(new Integer(in.readUnsignedShort()));
operands.add(new Integer(in.readUnsignedByte()));
operands.add(in.readUnsignedShort());
operands.add(in.readUnsignedByte());
i += 3;
break;
case opc_tableswitch:
in.discard((4 - (i + 1) % 4) % 4);
i += ((4 - (i + 1) % 4) % 4); // padding
operands.add(new Integer(in.readInt()));
operands.add(in.readInt());
i += 4;
int low = in.readInt();
operands.add(new Integer(low));
operands.add(low);
i += 4;
int high = in.readInt();
operands.add(new Integer(high));
operands.add(high);
i += 4;
for (int j = 0; j < high - low + 1; j++) {
operands.add(new Integer(in.readInt()));
operands.add(in.readInt());
i += 4;
}
group = GROUP_SWITCH;
@ -294,16 +294,16 @@ public class StructMethod extends StructMember {
case opc_lookupswitch:
in.discard((4 - (i + 1) % 4) % 4);
i += ((4 - (i + 1) % 4) % 4); // padding
operands.add(new Integer(in.readInt()));
operands.add(in.readInt());
i += 4;
int npairs = in.readInt();
operands.add(new Integer(npairs));
operands.add(npairs);
i += 4;
for (int j = 0; j < npairs; j++) {
operands.add(new Integer(in.readInt()));
operands.add(in.readInt());
i += 4;
operands.add(new Integer(in.readInt()));
operands.add(in.readInt());
i += 4;
}
group = GROUP_SWITCH;
@ -319,14 +319,17 @@ public class StructMethod extends StructMember {
}
}
int[] ops = new int[operands.size()];
for (int j = 0; j < operands.size(); j++) {
ops[j] = operands.get(j).intValue();
int[] ops = null;
if (!operands.isEmpty()) {
ops = new int[operands.size()];
for (int j = 0; j < operands.size(); j++) {
ops[j] = operands.get(j).intValue();
}
}
Instruction instr = ConstantsUtil.getInstructionInstance(opcode, wide, group, bytecode_version, ops);
instructions.addWithKey(instr, new Integer(offset));
instructions.addWithKey(instr, offset);
i++;
}

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