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/*******************************************************************************
* Copyright (c) 2009, 2021 Mountainminds GmbH & Co. KG and Contributors
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.internal.instr;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.TypePath;
/**
* Internal utility to add probes into the control flow of a method. The code
* for a probe simply sets a certain slot of a boolean array to true. In
* addition the probe array has to be retrieved at the beginning of the method
* and stored in a local variable.
*/
class ProbeInserter extends MethodVisitor implements IProbeInserter {
private final IProbeArrayStrategy arrayStrategy;
/**
* <code>true</code> if method is a class or interface initialization
* method.
*/
private final boolean clinit;
/** Position of the inserted variable. */
private final int variable;
/** Maximum stack usage of the code to access the probe array. */
private int accessorStackSize;
/**
* Creates a new {@link ProbeInserter}.
*
* @param access
* access flags of the adapted method
* @param name
* the method's name
* @param desc
* the method's descriptor
* @param mv
* the method visitor to which this adapter delegates calls
* @param arrayStrategy
* callback to create the code that retrieves the reference to
* the probe array
*/
ProbeInserter(final int access, final String name, final String desc,
final MethodVisitor mv, final IProbeArrayStrategy arrayStrategy) {
super(InstrSupport.ASM_API_VERSION, mv);
this.clinit = InstrSupport.CLINIT_NAME.equals(name);
this.arrayStrategy = arrayStrategy;
int pos = (Opcodes.ACC_STATIC & access) == 0 ? 1 : 0;
for (final Type t : Type.getArgumentTypes(desc)) {
pos += t.getSize();
}
variable = pos;
}
public void insertProbe(final int id) {
// BEGIN android-change
// For a probe we call setProbe on the IExecutionData object.
mv.visitVarInsn(Opcodes.ALOAD, variable);
// Stack[0]: Lorg/jacoco/core/data/IExecutionData;
InstrSupport.push(mv, id);
// Stack[1]: I
// Stack[0]: Lorg/jacoco/core/data/IExecutionData;
mv.visitMethodInsn(Opcodes.INVOKEINTERFACE, "org/jacoco/core/data/IExecutionData", "setProbe", "(I)V", true);
// END android-change
}
@Override
public void visitCode() {
accessorStackSize = arrayStrategy.storeInstance(mv, clinit, variable);
mv.visitCode();
}
@Override
public final void visitVarInsn(final int opcode, final int var) {
mv.visitVarInsn(opcode, map(var));
}
@Override
public final void visitIincInsn(final int var, final int increment) {
mv.visitIincInsn(map(var), increment);
}
@Override
public final void visitLocalVariable(final String name, final String desc,
final String signature, final Label start, final Label end,
final int index) {
mv.visitLocalVariable(name, desc, signature, start, end, map(index));
}
@Override
public AnnotationVisitor visitLocalVariableAnnotation(final int typeRef,
final TypePath typePath, final Label[] start, final Label[] end,
final int[] index, final String descriptor, final boolean visible) {
final int[] newIndex = new int[index.length];
for (int i = 0; i < newIndex.length; i++) {
newIndex[i] = map(index[i]);
}
return mv.visitLocalVariableAnnotation(typeRef, typePath, start, end,
newIndex, descriptor, visible);
}
@Override
public void visitMaxs(final int maxStack, final int maxLocals) {
// Max stack size of the probe code is 3 which can add to the
// original stack size depending on the probe locations. The accessor
// stack size is an absolute maximum, as the accessor code is inserted
// at the very beginning of each method when the stack size is empty.
final int increasedStack = Math.max(maxStack + 3, accessorStackSize);
mv.visitMaxs(increasedStack, maxLocals + 1);
}
private int map(final int var) {
if (var < variable) {
return var;
} else {
return var + 1;
}
}
@Override
public final void visitFrame(final int type, final int nLocal,
final Object[] local, final int nStack, final Object[] stack) {
if (type != Opcodes.F_NEW) { // uncompressed frame
throw new IllegalArgumentException(
"ClassReader.accept() should be called with EXPAND_FRAMES flag");
}
final Object[] newLocal = new Object[Math.max(nLocal, variable) + 1];
int idx = 0; // Arrays index for existing locals
int newIdx = 0; // Array index for new locals
int pos = 0; // Current variable position
while (idx < nLocal || pos <= variable) {
if (pos == variable) {
newLocal[newIdx++] = InstrSupport.DATAFIELD_DESC_UNQUALIFIED;
pos++;
} else {
if (idx < nLocal) {
final Object t = local[idx++];
newLocal[newIdx++] = t;
pos++;
if (t == Opcodes.LONG || t == Opcodes.DOUBLE) {
pos++;
}
} else {
// Fill unused slots with TOP
newLocal[newIdx++] = Opcodes.TOP;
pos++;
}
}
}
mv.visitFrame(type, newIdx, newLocal, nStack, stack);
}
}
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