# HG changeset patch
# User jlahoda
# Date 1563266902 -7200
# Node ID 1bb102c1cf276961a2563382e732f06b0f420db1
# Parent  04d80e7ad3f4be8f613f3d8f6d78fc1e12f255b3
8227640: javac crashes on text blocks with invalid escapes.
Summary: Do not translate escape sequences if text block contains illegal escapes.
Reviewed-by: jlaskey

diff -r 04d80e7ad3f4 -r 1bb102c1cf27 src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavaTokenizer.java
--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavaTokenizer.java	Mon Jul 15 16:25:23 2019 -0700
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavaTokenizer.java	Tue Jul 16 10:48:22 2019 +0200
@@ -99,6 +99,10 @@
      */
     protected boolean shouldTranslateEscapes;
 
+    /** Has the string broken escapes?
+     */
+    protected boolean hasBrokenEscapes;
+
     protected ScannerFactory fac;
 
     // The set of lint options currently in effect. It is initialized
@@ -261,6 +265,7 @@
                 case '\\':
                     reader.putChar(true); break;
                 default:
+                    hasBrokenEscapes = true;
                     lexError(reader.bp, Errors.IllegalEscChar);
                 }
             }
@@ -426,6 +431,7 @@
         // Clear flags.
         shouldStripIndent = false;
         shouldTranslateEscapes = false;
+        hasBrokenEscapes = false;
         // Check if text block string methods are present.
         boolean hasTextBlockSupport = TextBlockSupport.hasSupport();
         // Track the end of first line for error recovery.
@@ -1038,7 +1044,7 @@
                         string = TextBlockSupport.stripIndent(string);
                     }
                     // Translate escape sequences if present.
-                    if (shouldTranslateEscapes) {
+                    if (shouldTranslateEscapes && !hasBrokenEscapes) {
                         string = TextBlockSupport.translateEscapes(string);
                     }
                     // Build string token.
diff -r 04d80e7ad3f4 -r 1bb102c1cf27 test/langtools/tools/javac/TextBlockIllegalEscape.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/TextBlockIllegalEscape.java	Tue Jul 16 10:48:22 2019 +0200
@@ -0,0 +1,14 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 8227640
+ * @summary Verify that illegal escapes in text blocks do not crash the javac.
+ * @compile/fail/ref=TextBlockIllegalEscape.out --enable-preview -source ${jdk.version} -XDrawDiagnostics TextBlockIllegalEscape.java
+ */
+
+public class TextBlockIllegalEscape {
+    static void test() {
+        EQ("""
+           \!
+           """, "");
+    }
+}
diff -r 04d80e7ad3f4 -r 1bb102c1cf27 test/langtools/tools/javac/TextBlockIllegalEscape.out
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/TextBlockIllegalEscape.out	Tue Jul 16 10:48:22 2019 +0200
@@ -0,0 +1,4 @@
+TextBlockIllegalEscape.java:11:13: compiler.err.illegal.esc.char
+- compiler.note.preview.filename: TextBlockIllegalEscape.java
+- compiler.note.preview.recompile
+1 error