/*
 * Copyright (C) 2006 Google Inc.
 *
 * 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.inject.internal.util;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.base.Preconditions;
import com.google.common.collect.Maps;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.util.Map;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

/**
 * Looks up line numbers for classes and their members.
 *
 * @author Chris Nokleberg
 */
final class LineNumbers {

  private final Class type;
  private final Map<String, Integer> lines = Maps.newHashMap();
  private String source;
  private int firstLine = Integer.MAX_VALUE;

  /**
   * Reads line number information from the given class, if available.
   *
   * @param type the class to read line number information from
   */
  public LineNumbers(Class type) throws IOException {
    this.type = type;

    if (!type.isArray()) {
      InputStream in = null;
      try {
        in = type.getResourceAsStream("/" + type.getName().replace('.', '/') + ".class");
      } catch (IllegalStateException ignored) {
        // Some classloaders throw IllegalStateException when they can't load a resource.
      }
      if (in != null) {
        try {
          new ClassReader(in).accept(new LineNumberReader(), ClassReader.SKIP_FRAMES);
        } finally {
          try {
            in.close();
          } catch (IOException ignored) {
          }
        }
      }
    }
  }

  /**
   * Get the source file name as read from the bytecode.
   *
   * @return the source file name if available, or null
   */
  public String getSource() {
    return source;
  }

  /**
   * Get the line number associated with the given member.
   *
   * @param member a field, constructor, or method belonging to the class used during construction
   * @return the wrapped line number, or null if not available
   * @throws IllegalArgumentException if the member does not belong to the class used during
   *     construction
   */
  public Integer getLineNumber(Member member) {
    Preconditions.checkArgument(
        type == member.getDeclaringClass(),
        "Member %s belongs to %s, not %s",
        member,
        member.getDeclaringClass(),
        type);
    return lines.get(memberKey(member));
  }

  /** Gets the first line number. */
  public int getFirstLine() {
    return firstLine == Integer.MAX_VALUE ? 1 : firstLine;
  }

  private String memberKey(Member member) {
    checkNotNull(member, "member");

    /*if[AOP]*/
    if (member instanceof Field) {
      return member.getName();

    } else if (member instanceof Method) {
      return member.getName() + org.objectweb.asm.Type.getMethodDescriptor((Method) member);

    } else if (member instanceof Constructor) {
      StringBuilder sb = new StringBuilder().append("<init>(");
      for (Class param : ((Constructor) member).getParameterTypes()) {
        sb.append(org.objectweb.asm.Type.getDescriptor(param));
      }
      return sb.append(")V").toString();

    } else {
      throw new IllegalArgumentException(
          "Unsupported implementation class for Member, " + member.getClass());
    }
    /*end[AOP]*/
    /*if[NO_AOP]
    return "<NO_MEMBER_KEY>";
    end[NO_AOP]*/
  }

  private class LineNumberReader extends ClassVisitor {

    private int line = -1;
    private String pendingMethod;
    private String name;

    LineNumberReader() {
      super(Opcodes.ASM6);
    }

    @Override
    public void visit(
        int version,
        int access,
        String name,
        String signature,
        String superName,
        String[] interfaces) {
      this.name = name;
    }

    @Override
    public MethodVisitor visitMethod(
        int access, String name, String desc, String signature, String[] exceptions) {
      if ((access & Opcodes.ACC_PRIVATE) != 0) {
        return null;
      }
      pendingMethod = name + desc;
      line = -1;
      return new LineNumberMethodVisitor();
    }

    @Override
    public void visitSource(String source, String debug) {
      LineNumbers.this.source = source;
    }

    public void visitLineNumber(int line, Label start) {
      if (line < firstLine) {
        firstLine = line;
      }

      this.line = line;
      if (pendingMethod != null) {
        lines.put(pendingMethod, line);
        pendingMethod = null;
      }
    }

    @Override
    public FieldVisitor visitField(
        int access, String name, String desc, String signature, Object value) {
      return null;
    }

    @Override
    public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
      return new LineNumberAnnotationVisitor();
    }

    public AnnotationVisitor visitParameterAnnotation(int parameter, String desc, boolean visible) {
      return new LineNumberAnnotationVisitor();
    }

    class LineNumberMethodVisitor extends MethodVisitor {
      LineNumberMethodVisitor() {
        super(Opcodes.ASM6);
      }

      @Override
      public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
        return new LineNumberAnnotationVisitor();
      }

      @Override
      public AnnotationVisitor visitAnnotationDefault() {
        return new LineNumberAnnotationVisitor();
      }

      @Override
      public void visitFieldInsn(int opcode, String owner, String name, String desc) {
        if (opcode == Opcodes.PUTFIELD
            && LineNumberReader.this.name.equals(owner)
            && !lines.containsKey(name)
            && line != -1) {
          lines.put(name, line);
        }
      }

      @Override
      public void visitLineNumber(int line, Label start) {
        LineNumberReader.this.visitLineNumber(line, start);
      }
    }

    class LineNumberAnnotationVisitor extends AnnotationVisitor {
      LineNumberAnnotationVisitor() {
        super(Opcodes.ASM6);
      }

      @Override
      public AnnotationVisitor visitAnnotation(String name, String desc) {
        return this;
      }

      @Override
      public AnnotationVisitor visitArray(String name) {
        return this;
      }

      public void visitLocalVariable(
          String name, String desc, String signature, Label start, Label end, int index) {}
    }
  }
}

@@ -2204,16 +2204,299 @@
 RAMES);%0A
+        %7D catch (UnsupportedOperationException ignored) %7B%0A          // We may be trying to inspect classes that were compiled with a more recent version%0A          // of javac than our ASM supports.  If that happens, just ignore the class and don't%0A          // capture line numbers.%0A
         

Fix the JDK11 opensource build for Guice. This was failing by chance in the testlib tests because some of the tests were trying to create a JIT binding for "Integer", which caused Guice to try to parse Integer.class for line numbers. This failed because the JDK was 11, which compiles with "nest members", but our ASM (ASM6) doesn't support "nest members" yet.