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// Copyright 2015 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.lib.syntax.compiler;
import com.google.common.base.Preconditions;
import com.google.devtools.build.lib.syntax.compiler.Variable.InternalVariable;
import com.google.devtools.build.lib.syntax.compiler.Variable.SkylarkVariable;
import net.bytebuddy.description.method.MethodDescription;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.implementation.Implementation.Context;
import net.bytebuddy.implementation.bytecode.ByteCodeAppender;
import net.bytebuddy.implementation.bytecode.StackManipulation.Size;
import net.bytebuddy.implementation.bytecode.StackSize;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
// TODO(klaasb) javadoc
enum VariableStore {
INTEGER(Opcodes.ISTORE, StackSize.SINGLE),
LONG(Opcodes.LSTORE, StackSize.DOUBLE),
FLOAT(Opcodes.FSTORE, StackSize.SINGLE),
DOUBLE(Opcodes.DSTORE, StackSize.DOUBLE),
REFERENCE(Opcodes.ASTORE, StackSize.SINGLE);
private final int opCode;
private final Size size;
private VariableStore(int opCode, StackSize size) {
this.opCode = opCode;
this.size = size.toIncreasingSize();
}
// TODO(klaasb) javadoc
private VariableIndexStore into(int index) {
return new VariableIndexStore(index);
}
// TODO(klaasb) javadoc
public static VariableIndexStore into(SkylarkVariable variable) {
return REFERENCE.into(variable.index);
}
// TODO(klaasb) javadoc
public static VariableIndexStore into(InternalVariable variable) {
return forType(variable.type).into(variable.index);
}
// TODO(klaasb) javadoc
class VariableIndexStore implements ByteCodeAppender {
private int operandIndex;
private VariableIndexStore(int operandIndex) {
this.operandIndex = operandIndex;
}
@Override
public ByteCodeAppender.Size apply(
MethodVisitor methodVisitor,
Context implementationContext,
MethodDescription instrumentedMethod) {
methodVisitor.visitVarInsn(opCode, operandIndex);
return new ByteCodeAppender.Size(
size.getMaximalSize(), Math.max(instrumentedMethod.getStackSize(), operandIndex + 1));
}
@Override
public String toString() {
return "VariableStore(" + opCode + ", " + operandIndex + ")";
}
}
/**
* Selects the correct VariableStore value for the given type
*/
public static VariableStore forType(TypeDescription type) {
if (type.isPrimitive()) {
if (type.represents(long.class)) {
return LONG;
} else if (type.represents(double.class)) {
return DOUBLE;
} else if (type.represents(float.class)) {
return FLOAT;
} else {
Preconditions.checkArgument(
!type.represents(void.class), "Variables can't be of void type");
return INTEGER;
}
} else {
return REFERENCE;
}
}
}
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