From 5862fab639dfe2304f65399988c8815f52664666 Mon Sep 17 00:00:00 2001
Date: Fri, 22 Jan 2021 16:55:53 +0800
Subject: 8040327: Eliminate AnnotatedType && 8040319: Clean up
 type annotation exception index generating code in Code.java

Summary: <javac>: Find the correct exception_index in RuntimeInvisibleTypeAnnotations
LLT: langtools/test/tools/javac/annotations/typeAnnotations/referenceinfos/MultiCatch.java, langtools/test/tools/javac/annotations/typeAnnotations/referenceinfos/ExceptionParameters.java
Bug url: https://bugs.openjdk.java.net/browse/JDK-8040327, https://bugs.openjdk.java.net/browse/JDK-8040319
---
 .../javac/code/TypeAnnotationPosition.java    | 23 +++++++++++++++++++
 .../classes/com/sun/tools/javac/jvm/Code.java | 11 +++++----
 .../classes/com/sun/tools/javac/jvm/Gen.java  |  4 ++--
 3 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/langtools/src/share/classes/com/sun/tools/javac/code/TypeAnnotationPosition.java b/langtools/src/share/classes/com/sun/tools/javac/code/TypeAnnotationPosition.java
index c481ea5d3..f1f92b6ad 100644
--- a/langtools/src/share/classes/com/sun/tools/javac/code/TypeAnnotationPosition.java
+++ b/langtools/src/share/classes/com/sun/tools/javac/code/TypeAnnotationPosition.java
@@ -297,6 +297,29 @@ public class TypeAnnotationPosition {
         isValidOffset = true;
     }
 
+    public boolean hasCatchType() {
+        return exception_index < 0 && exception_index != Integer.MIN_VALUE;
+    }
+
+    public int getCatchType() {
+        Assert.check(hasCatchType(),
+            "exception_index does not contain valid catch info");
+        return ((-this.exception_index) - 1) & 0xff ;
+    }
+
+    public int getStartPos() {
+        Assert.check(hasCatchType(),
+            "exception_index does not contain valid catch info");
+        return ((-this.exception_index) - 1) >> 8;
+    }
+
+    public void setCatchInfo(final int catchType, final int startPos) {
+        Assert.check(this.exception_index < 0,
+            "exception_index already contains a bytecode index");
+        Assert.check(catchType >= 0, "Expected a valid catch type");
+        this.exception_index = -((catchType | startPos << 8) + 1);
+    }
+
     /**
      * Decode the binary representation for a type path and set
      * the {@code location} field.
diff --git a/langtools/src/share/classes/com/sun/tools/javac/jvm/Code.java b/langtools/src/share/classes/com/sun/tools/javac/jvm/Code.java
index 738c5a1d9..622a5942d 100644
--- a/langtools/src/share/classes/com/sun/tools/javac/jvm/Code.java
+++ b/langtools/src/share/classes/com/sun/tools/javac/jvm/Code.java
@@ -2135,14 +2135,16 @@ public class Code {
                 // same location; updating one is enough.
                 // Use -666 as a marker that the exception_index was already updated.
                 if (p.type_index != -666) {
-                    p.exception_index = findExceptionIndex(p.type_index);
+                    p.exception_index = findExceptionIndex(p);
                     p.type_index = -666;
                 }
             }
         }
     }
 
-    private int findExceptionIndex(int catchType) {
+    private int findExceptionIndex(TypeAnnotationPosition p) {
+        final int catchType = p.getCatchType();
+        final int startPos = p.getStartPos();
         if (catchType == Integer.MIN_VALUE) {
             // We didn't set the catch type index correctly.
             // This shouldn't happen.
@@ -2154,8 +2156,9 @@ public class Code {
         for (int i = 0; i < len; ++i) {
             char[] catchEntry = iter.head;
             iter = iter.tail;
-            char ct = catchEntry[3];
-            if (catchType == ct) {
+            int ct = catchEntry[3];
+            int sp = catchEntry[0];
+            if (catchType == ct && sp == startPos) {
                 return i;
             }
         }
diff --git a/langtools/src/share/classes/com/sun/tools/javac/jvm/Gen.java b/langtools/src/share/classes/com/sun/tools/javac/jvm/Gen.java
index 4cc7fb7bf..f79d3eeeb 100644
--- a/langtools/src/share/classes/com/sun/tools/javac/jvm/Gen.java
+++ b/langtools/src/share/classes/com/sun/tools/javac/jvm/Gen.java
@@ -1609,7 +1609,7 @@ public class Gen extends JCTree.Visitor {
                         if (subCatch.type.isAnnotated()) {
                             for (Attribute.TypeCompound tc :
                                      subCatch.type.getAnnotationMirrors()) {
-                                tc.position.type_index = catchType;
+                                tc.position.setCatchInfo(catchType, startpc);
                             }
                         }
                     }
@@ -1626,7 +1626,7 @@ public class Gen extends JCTree.Visitor {
                         if (subCatch.type.isAnnotated()) {
                             for (Attribute.TypeCompound tc :
                                      subCatch.type.getAnnotationMirrors()) {
-                                tc.position.type_index = catchType;
+                                tc.position.setCatchInfo(catchType, startpc);
                             }
                         }
                     }
-- 
2.19.0