save line number count though all methods/ctors

src/main/javassist/CtClass.java

@@ -71,6 +71,8 @@ public abstract class CtClass {
      */
     public static final String version = "3.29.2-GA";
 
+    private int linesCount = 0;
+
     /**
      * Prints the version number and the copyright notice.
      *
@@ -1575,6 +1577,14 @@ public abstract class CtClass {
                                       new DelayedFileOutputStream(filename)));
     }
 
+    public int getLinesCount() {
+        return linesCount;
+    }
+
+    void addLines(int count) {
+        this.linesCount += count;
+    }
+
     /**
      * Writes a class file as <code>writeFile()</code> does although this
      * method does not prune or freeze the class after writing the class

src/main/javassist/CtNewConstructor.java

@@ -69,6 +69,7 @@ public class CtNewConstructor {
         Javac compiler = new Javac(declaring);
         try {
             CtMember obj = compiler.compile(src);
+            declaring.addLines(src.split("\n").length);
             if (obj instanceof CtConstructor) {
                 // a stack map table has been already created.
                 return (CtConstructor)obj;

src/main/javassist/CtNewMethod.java

@@ -77,6 +77,7 @@ public class CtNewMethod {
                 compiler.recordProceed(delegateObj, delegateMethod);
 
             CtMember obj = compiler.compile(src);
+            declaring.addLines(src.split("\n").length);
             if (obj instanceof CtMethod)
                 return (CtMethod)obj;
         }

src/main/javassist/compiler/Javac.java

@@ -94,7 +94,8 @@ public class Javac {
      * @see #recordProceed(String,String)
      */
     public CtMember compile(String src) throws CompileError {
-        Parser p = new Parser(new Lex(src));
+        int startLine = gen.thisClass.getLinesCount();
+        Parser p = new Parser(new Lex(src, startLine));
         ASTList mem = p.parseMember1(stable);
         try {
             if (mem instanceof FieldDecl)

src/main/javassist/compiler/Lex.java

@@ -39,6 +39,10 @@ public class Lex implements TokenId {
      * Constructs a lexical analyzer.
      */
     public Lex(String s) {
+        this(s, 0);
+    }
+
+    Lex(String s, int startLineNumber) {
         lastChar = -1;
         textBuffer = new StringBuilder();
         currentToken = new Token();
@@ -47,7 +51,7 @@ public class Lex implements TokenId {
         input = s;
         position = 0;
         maxlen = s.length();
-        lineNumber = 0;
+        lineNumber = startLineNumber;
     }
 
     public int get() {

src/test/javassist/bytecode/BytecodeTest.java

@@ -317,6 +317,31 @@ public class BytecodeTest extends TestCase {
         fail("should not happen");
     }
 
+    public void testLineNumberCompiler2() {
+        CtClass testClass = loader.makeClass("javassist.bytecode.LineNumberCompilerClass2");
+        String ctor = String.join("\n",
+                "public LineNumberCompilerClass2() {",
+                "    super();",
+                "}");
+        String run = String.join("\n",
+                "public void run() {",
+                "    return;",
+                "}");
+        String run2 = String.join("\n",
+                "public void run2() {",
+                "    run()",
+                "}");
+        try {
+            testClass.addConstructor(CtNewConstructor.make(ctor, testClass));
+            testClass.addMethod(CtMethod.make(run, testClass));
+            testClass.addMethod(CtMethod.make(run2, testClass));
+        } catch (CannotCompileException e) {
+            assertEquals("line 9: ; is missing", e.getCause().getMessage());
+            return;
+        }
+        fail("should not happen");
+    }
+
     public void testLineNumberException() {
         CtClass testClass = loader.makeClass("javassist.bytecode.LineNumberExceptionClass");
         String run = String.join("\n",