List of usage examples for org.objectweb.asm.tree.analysis Frame getStack
public V getStack(final int index)
From source file:co.paralleluniverse.fibers.instrument.InstrumentMethod.java
License:Open Source License
private void dumpCodeBlock(MethodVisitor mv, int idx, int skip) { int start = codeBlocks[idx].endInstruction; int end = codeBlocks[idx + 1].endInstruction; for (int i = start + skip; i < end; i++) { AbstractInsnNode ins = mn.instructions.get(i); switch (ins.getOpcode()) { case Opcodes.RETURN: case Opcodes.ARETURN: case Opcodes.IRETURN: case Opcodes.LRETURN: case Opcodes.FRETURN: case Opcodes.DRETURN: emitPopMethod(mv);//from w w w. ja va2 s.c o m break; case Opcodes.MONITORENTER: case Opcodes.MONITOREXIT: if (!db.isAllowMonitors()) { if (!className.equals("clojure/lang/LazySeq")) throw new UnableToInstrumentException("synchronization", className, mn.name, mn.desc); } else if (!warnedAboutMonitors) { warnedAboutMonitors = true; db.log(LogLevel.WARNING, "Method %s#%s%s contains synchronization", className, mn.name, mn.desc); } break; case Opcodes.INVOKESPECIAL: MethodInsnNode min = (MethodInsnNode) ins; if ("<init>".equals(min.name)) { int argSize = TypeAnalyzer.getNumArguments(min.desc); Frame frame = frames[i]; int stackIndex = frame.getStackSize() - argSize - 1; Value thisValue = frame.getStack(stackIndex); if (stackIndex >= 1 && isNewValue(thisValue, true) && isNewValue(frame.getStack(stackIndex - 1), false)) { NewValue newValue = (NewValue) thisValue; if (newValue.omitted) { emitNewAndDup(mv, frame, stackIndex, min); } } else { db.log(LogLevel.WARNING, "Expected to find a NewValue on stack index %d: %s", stackIndex, frame); } } break; } ins.accept(mv); } }
From source file:co.paralleluniverse.fibers.instrument.InstrumentMethod.java
License:Open Source License
private void emitNewAndDup(MethodVisitor mv, Frame frame, int stackIndex, MethodInsnNode min) { int arguments = frame.getStackSize() - stackIndex - 1; int neededLocals = 0; for (int i = arguments; i >= 1; i--) { BasicValue v = (BasicValue) frame.getStack(stackIndex + i); mv.visitVarInsn(v.getType().getOpcode(Opcodes.ISTORE), lvarStack + NUM_LOCALS + neededLocals); neededLocals += v.getSize();//from www . jav a2 s . c o m } db.log(LogLevel.DEBUG, "Inserting NEW & DUP for constructor call %s%s with %d arguments (%d locals)", min.owner, min.desc, arguments, neededLocals); if (additionalLocals < neededLocals) { additionalLocals = neededLocals; } ((NewValue) frame.getStack(stackIndex - 1)).insn.accept(mv); ((NewValue) frame.getStack(stackIndex)).insn.accept(mv); for (int i = 1; i <= arguments; i++) { BasicValue v = (BasicValue) frame.getStack(stackIndex + i); neededLocals -= v.getSize(); mv.visitVarInsn(v.getType().getOpcode(Opcodes.ILOAD), lvarStack + NUM_LOCALS + neededLocals); } }
From source file:co.paralleluniverse.fibers.instrument.InstrumentMethod.java
License:Open Source License
private void emitStoreState(MethodVisitor mv, int idx, FrameInfo fi, int numArgsToPreserve) { Frame f = frames[fi.endInstruction]; if (fi.lBefore != null) fi.lBefore.accept(mv);/*from w w w . j a v a 2 s . co m*/ mv.visitVarInsn(Opcodes.ALOAD, lvarStack); emitConst(mv, idx); emitConst(mv, fi.numSlots); mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, STACK_NAME, "pushMethod", "(II)V"); // store operand stack for (int i = f.getStackSize(); i-- > 0;) { BasicValue v = (BasicValue) f.getStack(i); if (!isOmitted(v)) { if (!isNullType(v)) { int slotIdx = fi.stackSlotIndices[i]; assert slotIdx >= 0 && slotIdx < fi.numSlots; emitStoreValue(mv, v, lvarStack, slotIdx, -1); } else { db.log(LogLevel.DEBUG, "NULL stack entry: type=%s size=%d", v.getType(), v.getSize()); mv.visitInsn(Opcodes.POP); } } } // store local vars for (int i = firstLocal; i < f.getLocals(); i++) { BasicValue v = (BasicValue) f.getLocal(i); if (!isNullType(v)) { mv.visitVarInsn(v.getType().getOpcode(Opcodes.ILOAD), i); int slotIdx = fi.localSlotIndices[i]; assert slotIdx >= 0 && slotIdx < fi.numSlots; emitStoreValue(mv, v, lvarStack, slotIdx, i); } } // restore last numArgsToPreserve operands for (int i = f.getStackSize() - numArgsToPreserve; i < f.getStackSize(); i++) { BasicValue v = (BasicValue) f.getStack(i); if (!isOmitted(v)) { if (!isNullType(v)) { int slotIdx = fi.stackSlotIndices[i]; assert slotIdx >= 0 && slotIdx < fi.numSlots; emitRestoreValue(mv, v, lvarStack, slotIdx, -1); } else { mv.visitInsn(Opcodes.ACONST_NULL); } } } }
From source file:co.paralleluniverse.fibers.instrument.InstrumentMethod.java
License:Open Source License
private void emitRestoreState(MethodVisitor mv, int idx, FrameInfo fi, int numArgsPreserved) { Frame f = frames[fi.endInstruction]; // restore local vars for (int i = firstLocal; i < f.getLocals(); i++) { BasicValue v = (BasicValue) f.getLocal(i); if (!isNullType(v)) { int slotIdx = fi.localSlotIndices[i]; assert slotIdx >= 0 && slotIdx < fi.numSlots; emitRestoreValue(mv, v, lvarStack, slotIdx, i); mv.visitVarInsn(v.getType().getOpcode(Opcodes.ISTORE), i); } else if (v != BasicValue.UNINITIALIZED_VALUE) { mv.visitInsn(Opcodes.ACONST_NULL); mv.visitVarInsn(Opcodes.ASTORE, i); }/*from ww w . ja va2 s . c o m*/ } // restore operand stack for (int i = 0; i < f.getStackSize() - numArgsPreserved; i++) { BasicValue v = (BasicValue) f.getStack(i); if (!isOmitted(v)) { if (!isNullType(v)) { int slotIdx = fi.stackSlotIndices[i]; assert slotIdx >= 0 && slotIdx < fi.numSlots; emitRestoreValue(mv, v, lvarStack, slotIdx, -1); } else { mv.visitInsn(Opcodes.ACONST_NULL); } } } if (fi.lAfter != null) { fi.lAfter.accept(mv); } }
From source file:com.android.build.gradle.internal.incremental.ConstructorBuilder.java
License:Apache License
/** * Deconstruct a constructor into its components and adds the necessary code to link the components * later. This code is not valid java, but it can be expressed in bytecode. In essence for this constructor: * <pre>{@code//from w ww.ja v a2s .co m * <init>(int x) { * int a = 2; * super(int b = 3, x = 1, expr2() ? 3 : a++) * doSomething(x + a) * } * }</pre> * it creates two parts: * <pre>{@code * Object[] init$args(Clazz this, int x, Object[] locals) { // this is always null here * int a = locals[0]; * int b = 3; * Object[] args = new Object[3]; * args[0] = b; * args[1] = (x = 1) * args[2] = expr2() ? 3 : a++; * locals = new Object[3]; // The arguments + the locals * locals[0] = NULL; * locals[1] = x; * locals[2] = new Object[2]; * locals[2][0] = a; * locals[2][1] = b; * return new Object[] {locals, "myclass.<init>(I;I;)V", args}; * } * * void init$body(int x, Object[] locals) { * int a = locals[0]; * int b = locals[1]; * doSomething(x + a); * } * }</pre> * * @param owner the owning class. * @param method the constructor method. */ @NonNull public static Constructor build(@NonNull String owner, @NonNull MethodNode method) { // Basic interpreter uses BasicValue.REFERENCE_VALUE for all object types. However // we need to distinguish one in particular. The value of the local variable 0, ie. the // uninitialized this. By doing it this way we ensure that whenever there is a ALOAD_0 // a LocalValue instance will be on the stack. BasicInterpreter interpreter = new BasicInterpreter() { boolean done = false; @Override // newValue is called first to initialize the frame values of all the local variables // we intercept the first one to create our own special value. public BasicValue newValue(Type type) { if (type == null) { return BasicValue.UNINITIALIZED_VALUE; } else if (type.getSort() == Type.VOID) { return null; } else { // If this is the first value created (i.e. the first local variable) // we use a special marker. BasicValue ret = done ? super.newValue(type) : new LocalValue(type); done = true; return ret; } } }; Analyzer analyzer = new Analyzer(interpreter); AbstractInsnNode[] instructions = method.instructions.toArray(); try { Frame[] frames = analyzer.analyze(owner, method); if (frames.length != instructions.length) { // Should never happen. throw new IllegalStateException("The number of frames is not equals to the number of instructions"); } int stackAtThis = -1; boolean poppedThis = false; int firstLocal = 1; for (Type type : Type.getArgumentTypes(method.desc)) { firstLocal += type.getSize(); } LinkedHashSet<LocalVariable> variables = new LinkedHashSet<LocalVariable>(); VarInsnNode lastThis = null; int localsAtLastThis = 0; // Records the most recent line number encountered. For javac, there should always be // a line number node before the call of interest to this(...) or super(...). For robustness, // -1 is recorded as a sentinel to indicate this assumption didn't hold. Upstream consumers // should check for -1 and recover in a reasonable way (for example, don't set the line // number in generated code). int recentLine = -1; for (int i = 0; i < instructions.length; i++) { AbstractInsnNode insn = instructions[i]; Frame frame = frames[i]; if (frame.getStackSize() < stackAtThis) { poppedThis = true; } if (insn instanceof MethodInsnNode) { // TODO: Do we need to check that the stack is empty after this super call? MethodInsnNode methodhInsn = (MethodInsnNode) insn; Type[] types = Type.getArgumentTypes(methodhInsn.desc); Value value = frame.getStack(frame.getStackSize() - types.length - 1); if (value instanceof LocalValue && methodhInsn.name.equals("<init>")) { if (poppedThis) { throw new IllegalStateException("Unexpected constructor structure."); } return split(owner, method, lastThis, methodhInsn, recentLine, new ArrayList<LocalVariable>(variables), localsAtLastThis); } } else if (insn instanceof VarInsnNode) { VarInsnNode var = (VarInsnNode) insn; if (var.var == 0) { lastThis = var; localsAtLastThis = variables.size(); stackAtThis = frame.getStackSize(); poppedThis = false; } Type type = ByteCodeUtils.getTypeForStoreOpcode(var.getOpcode()); if (type != null && var.var >= firstLocal) { // Variables are equals based on their number, so they will be added // to the set only if they are new, and in the order they are seen. variables.add(new LocalVariable(type, var.var)); } } else if (insn instanceof LineNumberNode) { // Record the most recent line number encountered so that call to this(...) // or super(...) has line number information. Ultimately used to emit a line // number in the generated code. LineNumberNode lineNumberNode = (LineNumberNode) insn; recentLine = lineNumberNode.line; } } throw new IllegalStateException("Unexpected constructor structure."); } catch (AnalyzerException e) { throw new IllegalStateException(e); } }
From source file:com.android.build.gradle.internal.incremental.ConstructorDelegationDetector.java
License:Apache License
/** * Deconstruct a constructor into its components and adds the necessary code to link the components * later. The generated bytecode does not correspond exactly to this code, but in essence, for * a constructor of this form:/*from w w w . ja va 2s . co m*/ * <p/> * <code> * <init>(int x) { * super(x = 1, expr2() ? 3 : 7) * doSomething(x) * } * </code> * <p/> * it creates the two parts: * <code> * Object[] init$args(Object[] locals, int x) { * Object[] args = new Object[2]; * args[0] = (x = 1) * args[1] = expr2() ? 3 : 7; * locals[0] = x; * return new Object[] {"myclass.<init>(I;I;)V", args}; * } * * void init$body(int x) { * doSomething(x); * } * </code> * * @param owner the owning class. * @param method the constructor method. */ @NonNull public static Constructor deconstruct(@NonNull String owner, @NonNull MethodNode method) { // Basic interpreter uses BasicValue.REFERENCE_VALUE for all object types. However // we need to distinguish one in particular. The value of the local variable 0, ie. the // uninitialized this. By doing it this way we ensure that whenever there is a ALOAD_0 // a LocalValue instance will be on the stack. BasicInterpreter interpreter = new BasicInterpreter() { boolean done = false; @Override // newValue is called first to initialize the frame values of all the local variables // we intercept the first one to create our own special value. public BasicValue newValue(Type type) { if (type == null) { return BasicValue.UNINITIALIZED_VALUE; } else if (type.getSort() == Type.VOID) { return null; } else { // If this is the first value created (i.e. the first local variable) // we use a special marker. BasicValue ret = done ? super.newValue(type) : new LocalValue(type); done = true; return ret; } } }; Analyzer analyzer = new Analyzer(interpreter); AbstractInsnNode[] instructions = method.instructions.toArray(); try { Frame[] frames = analyzer.analyze(owner, method); if (frames.length != instructions.length) { // Should never happen. throw new IllegalStateException("The number of frames is not equals to the number of instructions"); } VarInsnNode lastThis = null; int stackAtThis = -1; boolean poppedThis = false; // Records the most recent line number encountered. For javac, there should always be // a line number node before the call of interest to this(...) or super(...). For robustness, // -1 is recorded as a sentinel to indicate this assumption didn't hold. Upstream consumers // should check for -1 and recover in a reasonable way (for example, don't set the line // number in generated code). int recentLine = -1; for (int i = 0; i < instructions.length; i++) { AbstractInsnNode insn = instructions[i]; Frame frame = frames[i]; if (frame.getStackSize() < stackAtThis) { poppedThis = true; } if (insn instanceof MethodInsnNode) { // TODO: Do we need to check that the stack is empty after this super call? MethodInsnNode methodhInsn = (MethodInsnNode) insn; Type[] types = Type.getArgumentTypes(methodhInsn.desc); Value value = frame.getStack(frame.getStackSize() - types.length - 1); if (value instanceof LocalValue && methodhInsn.name.equals("<init>")) { if (poppedThis) { throw new IllegalStateException("Unexpected constructor structure."); } return split(owner, method, lastThis, methodhInsn, recentLine); } } else if (insn instanceof VarInsnNode) { VarInsnNode var = (VarInsnNode) insn; if (var.var == 0) { lastThis = var; stackAtThis = frame.getStackSize(); poppedThis = false; } } else if (insn instanceof LineNumberNode) { // Record the most recent line number encountered so that call to this(...) // or super(...) has line number information. Ultimately used to emit a line // number in the generated code. LineNumberNode lineNumberNode = (LineNumberNode) insn; recentLine = lineNumberNode.line; } } throw new IllegalStateException("Unexpected constructor structure."); } catch (AnalyzerException e) { throw new IllegalStateException(e); } }
From source file:com.android.build.gradle.internal2.incremental.ConstructorBuilder.java
License:Apache License
/** * Deconstruct a constructor into its components and adds the necessary code to link the components * later. This code is not valid java, but it can be expressed in bytecode. In essence for this constructor: * <pre>{@code//ww w . ja v a2 s .co m * <init>(int x) { * int a = 2; * super(int b = 3, x = 1, expr2() ? 3 : a++) * doSomething(x + a) * } * }</pre> * it creates two parts: * <pre>{@code * Object[] init$args(Clazz this, int x, Object[] locals) { // this is always null here * int a = locals[0]; * int b = 3; * Object[] args = new Object[3]; * args[0] = b; * args[1] = (x = 1) * args[2] = expr2() ? 3 : a++; * locals = new Object[3]; // The arguments + the locals * locals[0] = NULL; * locals[1] = x; * locals[2] = new Object[2]; * locals[2][0] = a; * locals[2][1] = b; * return new Object[] {locals, "myclass.<init>(I;I;)V", args}; * } * * void init$body(int x, Object[] locals) { * int a = locals[0]; * int b = locals[1]; * doSomething(x + a); * } * }</pre> * * @param owner the owning class. * @param method the constructor method. */ @NonNull public static Constructor build(@NonNull String owner, @NonNull MethodNode method) { // Basic interpreter uses BasicValue.REFERENCE_VALUE for all object types. However // we need to distinguish one in particular. The value of the local variable 0, ie. the // uninitialized this. By doing it this way we ensure that whenever there is a ALOAD_0 // a LocalValue instance will be on the stack. BasicInterpreter interpreter = new BasicInterpreter() { boolean done = false; @Override // newValue is called first to initialize the frame values of all the local variables // we intercept the first one to create our own special value. public BasicValue newValue(Type type) { if (type == null) { return BasicValue.UNINITIALIZED_VALUE; } else if (type.getSort() == Type.VOID) { return null; } else { // If this is the first value created (i.e. the first local variable) // we use a special marker. BasicValue ret = done ? super.newValue(type) : new LocalValue(type); done = true; return ret; } } }; Analyzer analyzer = new Analyzer(interpreter); AbstractInsnNode[] instructions = method.instructions.toArray(); try { Frame[] frames = analyzer.analyze(owner, method); if (frames.length != instructions.length) { // Should never happen. throw new IllegalStateException("The number of frames is not equals to the number of instructions"); } int stackAtThis = -1; boolean poppedThis = false; int firstLocal = 1; for (Type type : Type.getArgumentTypes(method.desc)) { firstLocal += type.getSize(); } LinkedHashSet<LocalVariable> variables = new LinkedHashSet<LocalVariable>(); VarInsnNode lastThis = null; int localsAtLastThis = 0; // Records the most recent line number encountered. For javac, there should always be // a line number node before the call of interest to this(...) or super(...). For robustness, // -1 is recorded as a sentinel to indicate this assumption didn't hold. Upstream consumers // should check for -1 and recover in a reasonable way (for example, don't set the line // number in generated code). int recentLine = -1; for (int i = 0; i < instructions.length; i++) { AbstractInsnNode insn = instructions[i]; Frame frame = frames[i]; if (frame.getStackSize() < stackAtThis) { poppedThis = true; } if (insn instanceof MethodInsnNode) { // TODO: Do we need to check that the stack is empty after this super call? MethodInsnNode methodhInsn = (MethodInsnNode) insn; Type[] types = Type.getArgumentTypes(methodhInsn.desc); Value value = frame.getStack(frame.getStackSize() - types.length - 1); if (value instanceof LocalValue && methodhInsn.name.equals(ByteCodeUtils.CONSTRUCTOR)) { if (poppedThis) { throw new IllegalStateException("Unexpected constructor structure."); } return split(owner, method, lastThis, methodhInsn, recentLine, new ArrayList<LocalVariable>(variables), localsAtLastThis); } } else if (insn instanceof VarInsnNode) { VarInsnNode var = (VarInsnNode) insn; if (var.var == 0) { lastThis = var; localsAtLastThis = variables.size(); stackAtThis = frame.getStackSize(); poppedThis = false; } Type type = ByteCodeUtils.getTypeForStoreOpcode(var.getOpcode()); if (type != null && var.var >= firstLocal) { // Variables are equals based on their number, so they will be added // to the set only if they are new, and in the order they are seen. variables.add(new LocalVariable(type, var.var)); } } else if (insn instanceof LineNumberNode) { // Record the most recent line number encountered so that call to this(...) // or super(...) has line number information. Ultimately used to emit a line // number in the generated code. LineNumberNode lineNumberNode = (LineNumberNode) insn; recentLine = lineNumberNode.line; } } throw new IllegalStateException("Unexpected constructor structure."); } catch (AnalyzerException e) { throw new IllegalStateException(e); } }
From source file:com.android.tools.lint.checks.JavaScriptInterfaceDetector.java
License:Apache License
@Nullable private String findFirstArgType(ClassContext context, ClassNode classNode, MethodNode method, MethodInsnNode call) {/*www. j av a2s . com*/ // Find object being passed in as the first argument Analyzer analyzer = new Analyzer(new SourceInterpreter() { @Override public SourceValue newOperation(AbstractInsnNode insn) { if (insn.getOpcode() == Opcodes.NEW) { String desc = ((TypeInsnNode) insn).desc; return new TypeValue(1, desc); } return super.newOperation(insn); } @Override public SourceValue newValue(Type type) { if (type != null && type.getSort() == Type.VOID) { return null; } else if (type != null) { return new TypeValue(1, type.getInternalName()); } return super.newValue(type); } @Override public SourceValue copyOperation(AbstractInsnNode insn, SourceValue value) { return value; } }); try { Frame[] frames = analyzer.analyze(classNode.name, method); InsnList instructions = method.instructions; Frame frame = frames[instructions.indexOf(call)]; if (frame.getStackSize() <= 1) { return null; } SourceValue stackValue = (SourceValue) frame.getStack(1); if (stackValue instanceof TypeValue) { return ((TypeValue) stackValue).getFqcn(); } } catch (AnalyzerException e) { context.log(e, null); } return null; }
From source file:com.android.tools.lint.checks.LocaleDetector.java
License:Apache License
@Override public void checkCall(@NonNull ClassContext context, @NonNull ClassNode classNode, @NonNull MethodNode method, @NonNull MethodInsnNode call) {//from w w w .ja va 2s . c om String owner = call.owner; String desc = call.desc; String name = call.name; if (owner.equals(DATE_FORMAT_OWNER)) { if (!name.equals(CONSTRUCTOR_NAME)) { return; } if (desc.equals("(Ljava/lang/String;Ljava/text/DateFormatSymbols;)V") //$NON-NLS-1$ || desc.equals("()V") //$NON-NLS-1$ || desc.equals("(Ljava/lang/String;)V")) { //$NON-NLS-1$ Location location = context.getLocation(call); String message = "To get local formatting use getDateInstance(), getDateTimeInstance(), " + "or getTimeInstance(), or use new SimpleDateFormat(String template, " + "Locale locale) with for example Locale.US for ASCII dates."; context.report(DATE_FORMAT, method, call, location, message, null); } return; } else if (!owner.equals(STRING_OWNER)) { return; } if (name.equals(FORMAT_METHOD)) { // Only check the non-locale version of String.format if (!desc.equals("(Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String;")) { //$NON-NLS-1$ return; } // Find the formatting string Analyzer analyzer = new Analyzer(new SourceInterpreter() { @Override public SourceValue newOperation(AbstractInsnNode insn) { if (insn.getOpcode() == Opcodes.LDC) { Object cst = ((LdcInsnNode) insn).cst; if (cst instanceof String) { return new StringValue(1, (String) cst); } } return super.newOperation(insn); } }); try { Frame[] frames = analyzer.analyze(classNode.name, method); InsnList instructions = method.instructions; Frame frame = frames[instructions.indexOf(call)]; if (frame.getStackSize() == 0) { return; } SourceValue stackValue = (SourceValue) frame.getStack(0); if (stackValue instanceof StringValue) { String format = ((StringValue) stackValue).getString(); if (format != null && StringFormatDetector.isLocaleSpecific(format)) { Location location = context.getLocation(call); String message = "Implicitly using the default locale is a common source of bugs: " + "Use String.format(Locale, ...) instead"; context.report(STRING_LOCALE, method, call, location, message, null); } } } catch (AnalyzerException e) { context.log(e, null); } } else { if (desc.equals("()Ljava/lang/String;")) { //$NON-NLS-1$ Location location = context.getLocation(call); String message = String.format("Implicitly using the default locale is a common source of bugs: " + "Use %1$s(Locale) instead", name); context.report(STRING_LOCALE, method, call, location, message, null); } } }
From source file:com.android.tools.lint.checks.SecureRandomDetector.java
License:Apache License
@Override public void checkCall(@NonNull ClassContext context, @NonNull ClassNode classNode, @NonNull MethodNode method, @NonNull MethodInsnNode call) {/*from ww w.ja v a 2 s . c o m*/ String owner = call.owner; String desc = call.desc; if (owner.equals(OWNER_SECURE_RANDOM)) { if (desc.startsWith(LONG_ARG)) { checkValidSetSeed(context, call); } else if (desc.startsWith("([B)")) { //$NON-NLS-1$ // setSeed(byte[]) ... // We could do some flow analysis here to see whether the byte array getting // passed in appears to be fixed. // However, people calling this constructor rather than the simpler one // with a fixed integer are probably less likely to make that mistake... right? } } else if (owner.equals(OWNER_RANDOM) && desc.startsWith(LONG_ARG)) { // Called setSeed(long) on an instanceof a Random object. Flag this if the instance // is likely a SecureRandom. // Track allocations such that we know whether the type of the call // is on a SecureRandom rather than a Random Analyzer analyzer = new Analyzer(new BasicInterpreter() { @Override public BasicValue newValue(Type type) { if (type != null && type.getDescriptor().equals(VM_SECURE_RANDOM)) { return new BasicValue(type); } return super.newValue(type); } }); try { Frame[] frames = analyzer.analyze(classNode.name, method); InsnList instructions = method.instructions; Frame frame = frames[instructions.indexOf(call)]; int stackSlot = frame.getStackSize(); for (Type type : Type.getArgumentTypes(desc)) { stackSlot -= type.getSize(); } BasicValue stackValue = (BasicValue) frame.getStack(stackSlot); Type type = stackValue.getType(); if (type != null && type.getDescriptor().equals(VM_SECURE_RANDOM)) { checkValidSetSeed(context, call); } } catch (AnalyzerException e) { context.log(e, null); } } else if (owner.equals(OWNER_RANDOM) && desc.startsWith(LONG_ARG)) { // Called setSeed(long) on an instanceof a Random object. Flag this if the instance // is likely a SecureRandom. // TODO } }