# HG changeset patch
# User shade
# Date 1547482820 -3600
# Node ID cf80666df79aea737a48fe250fa93d16c31c6567
# Parent  bbc79e0ec9ee23cbd419c47ec3689721fd61ed4d
8216308: StackTraceElement::fill_in can use injected Class source-file
Reviewed-by: coleenp, dholmes

diff -r bbc79e0ec9ee -r cf80666df79a src/hotspot/share/classfile/javaClasses.cpp
--- a/src/hotspot/share/classfile/javaClasses.cpp	Mon Jan 14 00:00:00 2019 +0100
+++ b/src/hotspot/share/classfile/javaClasses.cpp	Mon Jan 14 17:20:20 2019 +0100
@@ -1354,6 +1354,16 @@
   return o;
 }
 
+oop java_lang_Class::source_file(oop java_class) {
+  assert(_source_file_offset != 0, "must be set");
+  return java_class->obj_field(_source_file_offset);
+}
+
+void java_lang_Class::set_source_file(oop java_class, oop source_file) {
+  assert(_source_file_offset != 0, "must be set");
+  java_class->obj_field_put(_source_file_offset, source_file);
+}
+
 oop java_lang_Class::create_basic_type_mirror(const char* basic_type_name, BasicType type, TRAPS) {
   // This should be improved by adding a field at the Java level or by
   // introducing a new VM klass (see comment in ClassFileParser)
@@ -2602,10 +2612,26 @@
   } else {
     // Fill in source file name and line number.
     Symbol* source = Backtrace::get_source_file_name(holder, version);
-    if (ShowHiddenFrames && source == NULL)
-      source = vmSymbols::unknown_class_name();
-    oop filename = StringTable::intern(source, CHECK);
-    java_lang_StackTraceElement::set_fileName(element(), filename);
+    oop source_file = java_lang_Class::source_file(java_class());
+    if (source != NULL) {
+      // Class was not redefined. We can trust its cache if set,
+      // else we have to initialize it.
+      if (source_file == NULL) {
+        source_file = StringTable::intern(source, CHECK);
+        java_lang_Class::set_source_file(java_class(), source_file);
+      }
+    } else {
+      // Class was redefined. Dump the cache if it was set.
+      if (source_file != NULL) {
+        source_file = NULL;
+        java_lang_Class::set_source_file(java_class(), source_file);
+      }
+      if (ShowHiddenFrames) {
+        source = vmSymbols::unknown_class_name();
+        source_file = StringTable::intern(source, CHECK);
+      }
+    }
+    java_lang_StackTraceElement::set_fileName(element(), source_file);
 
     int line_number = Backtrace::get_line_number(method, bci);
     java_lang_StackTraceElement::set_lineNumber(element(), line_number);
@@ -3980,6 +4006,7 @@
 int java_lang_Class::_init_lock_offset;
 int java_lang_Class::_signers_offset;
 int java_lang_Class::_name_offset;
+int java_lang_Class::_source_file_offset;
 GrowableArray<Klass*>* java_lang_Class::_fixup_mirror_list = NULL;
 GrowableArray<Klass*>* java_lang_Class::_fixup_module_field_list = NULL;
 int java_lang_Throwable::backtrace_offset;
diff -r bbc79e0ec9ee -r cf80666df79a src/hotspot/share/classfile/javaClasses.hpp
--- a/src/hotspot/share/classfile/javaClasses.hpp	Mon Jan 14 00:00:00 2019 +0100
+++ b/src/hotspot/share/classfile/javaClasses.hpp	Mon Jan 14 17:20:20 2019 +0100
@@ -219,7 +219,8 @@
   macro(java_lang_Class, oop_size,               int_signature,     false) \
   macro(java_lang_Class, static_oop_field_count, int_signature,     false) \
   macro(java_lang_Class, protection_domain,      object_signature,  false) \
-  macro(java_lang_Class, signers,                object_signature,  false)
+  macro(java_lang_Class, signers,                object_signature,  false) \
+  macro(java_lang_Class, source_file,            object_signature,  false) \
 
 class java_lang_Class : AllStatic {
   friend class VMStructs;
@@ -241,6 +242,7 @@
   static int _module_offset;
   static int _component_mirror_offset;
   static int _name_offset;
+  static int _source_file_offset;
 
   static bool offsets_computed;
   static int classRedefinedCount_offset;
@@ -313,6 +315,9 @@
 
   static oop name(Handle java_class, TRAPS);
 
+  static oop source_file(oop java_class);
+  static void set_source_file(oop java_class, oop source_file);
+
   static int oop_size(oop java_class);
   static int oop_size_raw(oop java_class);
   static void set_oop_size(HeapWord* java_class, int size);
diff -r bbc79e0ec9ee -r cf80666df79a src/hotspot/share/classfile/vmSymbols.hpp
--- a/src/hotspot/share/classfile/vmSymbols.hpp	Mon Jan 14 00:00:00 2019 +0100
+++ b/src/hotspot/share/classfile/vmSymbols.hpp	Mon Jan 14 17:20:20 2019 +0100
@@ -425,6 +425,7 @@
   template(static_oop_field_count_name,               "static_oop_field_count")                   \
   template(protection_domain_name,                    "protection_domain")                        \
   template(signers_name,                              "signers_name")                             \
+  template(source_file_name,                          "source_file")                              \
   template(loader_data_name,                          "loader_data")                              \
   template(vmdependencies_name,                       "vmdependencies")                           \
   template(last_cleanup_name,                         "last_cleanup")                             \