package io.quarkus.gizmo; import java.util.IdentityHashMap; import org.objectweb.asm.Opcodes; import org.objectweb.asm.util.Printer; import org.objectweb.asm.Label; import org.objectweb.asm.MethodVisitor; public final class GizmoMethodVisitor extends MethodVisitor { private final GizmoClassVisitor cv; private final IdentityHashMap<Label, String> labelNames = new IdentityHashMap<>(); int labelCnt = 1; public GizmoMethodVisitor(final int api, final MethodVisitor delegate, final GizmoClassVisitor cv) { super(api, delegate); this.cv = cv; } public boolean nameLabel(Label label, String name) { return labelNames.putIfAbsent(label, name) == null; } String getNameOf(Label label) { String str = labelNames.get(label); if (str == null) { str = "label" + (labelCnt ++); labelNames.put(label, str); } return str; } public void visitGizmoNode(StackTraceElement element, String opName) { checkMethod(); cv.append("// ").append(opName).newLine(); if (element != null) cv.append("// at ").append(element.toString()).newLine(); } public void visitInsn(final int opcode) { checkMethod(); final int lineNumber = cv.getLineNumber(); cv.append(getOpString(opcode)).newLine(); final Label label = new Label(); super.visitLabel(label); super.visitLineNumber(lineNumber, label); super.visitInsn(opcode); } public void visitIntInsn(final int opcode, final int operand) { checkMethod(); final int lineNumber = cv.getLineNumber(); cv.append(getOpString(opcode)).append(' ').append(operand).newLine(); final Label label = new Label(); super.visitLabel(label); super.visitLineNumber(lineNumber, label); super.visitIntInsn(opcode, operand); } public void visitVarInsn(final int opcode, final int varNum) { checkMethod(); final int lineNumber = cv.getLineNumber(); cv.append(getOpString(opcode)).append(' ').append(varNum).newLine(); final Label label = new Label(); super.visitLabel(label); super.visitLineNumber(lineNumber, label); super.visitVarInsn(opcode, varNum); } public void visitTypeInsn(final int opcode, final String type) { checkMethod(); final int lineNumber = cv.getLineNumber(); cv.append(getOpString(opcode)).append(' ').append(type).newLine(); final Label label = new Label(); super.visitLabel(label); super.visitLineNumber(lineNumber, label); super.visitTypeInsn(opcode, type); } public void visitFieldInsn(final int opcode, final String owner, final String name, final String descriptor) { checkMethod(); cv.append("// Field descriptor: ").append(descriptor).newLine(); final int lineNumber = cv.getLineNumber(); cv.append(getOpString(opcode)).append(' ').append(owner).append('#').append(name).newLine(); final Label label = new Label(); super.visitLabel(label); super.visitLineNumber(lineNumber, label); super.visitFieldInsn(opcode, owner, name, descriptor); } public void visitMethodInsn(final int opcode, final String owner, final String name, final String descriptor) { checkMethod(); cv.append("// Method descriptor: ").append(descriptor).newLine(); final int lineNumber = cv.getLineNumber(); cv.append(getOpString(opcode)).append(' ').append(owner).append('#').append(name).newLine(); final Label label = new Label(); super.visitLabel(label); super.visitLineNumber(lineNumber, label); super.visitMethodInsn(opcode, owner, name, descriptor); } public void visitMethodInsn(final int opcode, final String owner, final String name, final String descriptor, final boolean isInterface) { checkMethod(); cv.append("// Method descriptor: ").append(descriptor).newLine(); final int lineNumber = cv.getLineNumber(); cv.append(getOpString(opcode)).append(' ').append(owner).append('#').append(name).newLine(); final Label label = new Label(); super.visitLabel(label); super.visitLineNumber(lineNumber, label); super.visitMethodInsn(opcode, owner, name, descriptor, isInterface); } public void visitJumpInsn(final int opcode, final Label target) { checkMethod(); final int lineNumber = cv.getLineNumber(); cv.append(getOpString(opcode)).append(' ').append(getNameOf(target)).newLine(); final Label label = new Label(); super.visitLabel(label); super.visitLineNumber(lineNumber, label); super.visitJumpInsn(opcode, target); } public void visitLabel(final Label label) { cv.append("** ").append(getNameOf(label)).newLine(); super.visitLabel(label); } public void visitLdcInsn(final Object value) { checkMethod(); final int lineNumber = cv.getLineNumber(); cv.append(getOpString(Opcodes.LDC)).append(" (").append(value.getClass().getSimpleName()).append(") "); if (value instanceof String) { cv.append('"').append(value).append('"'); } else { cv.append(value); } cv.newLine(); final Label label = new Label(); super.visitLabel(label); super.visitLineNumber(lineNumber, label); super.visitLdcInsn(value); } public void visitIincInsn(final int var, final int increment) { checkMethod(); final int lineNumber = cv.getLineNumber(); cv.append(getOpString(Opcodes.IINC)).append(' ').append(var).append(' ').append(increment > 0 ? '+' : '-').append(increment).newLine(); final Label label = new Label(); super.visitLabel(label); super.visitLineNumber(lineNumber, label); super.visitIincInsn(var, increment); } public void visitTableSwitchInsn(final int min, final int max, final Label dflt, final Label... labels) { checkMethod(); final int lineNumber = cv.getLineNumber(); cv.append(getOpString(Opcodes.TABLESWITCH)).newLine(); for (int i = 0; i < max - min; i++) { cv.append(" [").append(min + i).append("]: goto ").append(getNameOf(labels[i])).newLine(); } cv.append(" default: goto ").append(getNameOf(dflt)).newLine(); final Label label = new Label(); super.visitLabel(label); super.visitLineNumber(lineNumber, label); super.visitTableSwitchInsn(min, max, dflt, labels); } public void visitLookupSwitchInsn(final Label dflt, final int[] keys, final Label[] labels) { checkMethod(); final int lineNumber = cv.getLineNumber(); cv.append(getOpString(Opcodes.TABLESWITCH)).newLine(); for (int i = 0; i < labels.length; i++) { cv.append(" [").append(keys[i]).append("]: goto ").append(getNameOf(labels[i])).newLine(); } cv.append(" default: goto ").append(getNameOf(dflt)).newLine(); final Label label = new Label(); super.visitLabel(label); super.visitLineNumber(lineNumber, label); super.visitLookupSwitchInsn(dflt, keys, labels); } public void visitMultiANewArrayInsn(final String descriptor, final int numDimensions) { checkMethod(); cv.append("// Array descriptor: ").append(descriptor).newLine(); final int lineNumber = cv.getLineNumber(); cv.append(getOpString(Opcodes.MULTIANEWARRAY)).append(' ').append(numDimensions).newLine(); final Label label = new Label(); super.visitLabel(label); super.visitLineNumber(lineNumber, label); super.visitMultiANewArrayInsn(descriptor, numDimensions); } public void visitTryCatchBlock(final Label start, final Label end, final Label handler, final String type) { checkMethod(); cv.append("// Try from ").append(getNameOf(start)).append(" to ").append(getNameOf(end)).newLine(); cv.append("// Catch ").append(type).append(" by going to ").append(getNameOf(handler)).newLine(); super.visitTryCatchBlock(start, end, handler, type); } public void visitEnd() { cv.methodVisitEnd(); super.visitEnd(); } void checkMethod() { if (cv.getCurrentMethod() != this) { throw new IllegalStateException("Wrong method is active"); } } private static String getOpString(final int opcode) { return Printer.OPCODES[opcode]; } }