Merge branch 'upstream-master'

Author: Datadog Syncup Service

src/hotspot/cpu/x86/downcallLinker_x86_64.cpp

@@ -34,8 +34,8 @@
 
 #define __ _masm->
 
-static const int native_invoker_code_base_size = 512;
-static const int native_invoker_size_per_arg = 8;
+static const int native_invoker_code_base_size = 256;
+static const int native_invoker_size_per_arg = 16;
 
 RuntimeStub* DowncallLinker::make_downcall_stub(BasicType* signature,
                                                 int num_args,

src/hotspot/share/code/codeBlob.hpp

@@ -595,6 +595,7 @@ class UpcallLinker;
 
 // A (Panama) upcall stub. Not used by JNI.
 class UpcallStub: public RuntimeBlob {
+  friend class VMStructs;
   friend class UpcallLinker;
  private:
   jobject _receiver;

src/hotspot/share/runtime/vmStructs.cpp

@@ -563,6 +563,12 @@
                                                                                                                                      \
   nonstatic_field(DeoptimizationBlob,          _unpack_offset,                                int)                                   \
                                                                                                                                      \
+  /*****************************************************/                                                                            \
+  /* UpcallStubs (NOTE: incomplete, but only a little) */                                                                            \
+  /*****************************************************/                                                                            \
+                                                                                                                                     \
+  nonstatic_field(UpcallStub,                  _frame_data_offset,                            ByteSize)                              \
+                                                                                                                                     \
   /**************************************************/                                                                               \
   /* NMethods (NOTE: incomplete, but only a little) */                                                                               \
   /**************************************************/                                                                               \
@@ -1012,7 +1018,9 @@
   nonstatic_field(AccessFlags,                 _flags,                                        jint)                                  \
   nonstatic_field(elapsedTimer,                _counter,                                      jlong)                                 \
   nonstatic_field(elapsedTimer,                _active,                                       bool)                                  \
-  nonstatic_field(InvocationCounter,           _counter,                                      unsigned int)
+  nonstatic_field(InvocationCounter,           _counter,                                      unsigned int)                          \
+                                                                                                                                     \
+  nonstatic_field(UpcallStub::FrameData,       jfa,                                           JavaFrameAnchor)
 
 //--------------------------------------------------------------------------------
 // VM_TYPES
@@ -1306,6 +1314,7 @@
   declare_type(nmethod,                  CodeBlob)                        \
   declare_type(RuntimeStub,              RuntimeBlob)                     \
   declare_type(SingletonBlob,            RuntimeBlob)                     \
+  declare_type(UpcallStub,               RuntimeBlob)                     \
   declare_type(SafepointBlob,            SingletonBlob)                   \
   declare_type(DeoptimizationBlob,       SingletonBlob)                   \
   declare_c2_type(ExceptionBlob,         SingletonBlob)                   \
@@ -1900,6 +1909,7 @@
   declare_integer_type(BasicType)   /* FIXME: wrong type (not integer) */ \
                                                                           \
   declare_integer_type(CompLevel)                                         \
+  declare_integer_type(ByteSize)                                          \
   JVMTI_ONLY(declare_toplevel_type(BreakpointInfo))                       \
   JVMTI_ONLY(declare_toplevel_type(BreakpointInfo*))                      \
   declare_toplevel_type(CodeBlob*)                                        \
@@ -1948,6 +1958,7 @@
   declare_type(FileMapInfo, CHeapObj<mtInternal>)                         \
   declare_toplevel_type(FileMapHeader)                                    \
   declare_toplevel_type(CDSFileMapRegion)                                 \
+  declare_toplevel_type(UpcallStub::FrameData)                            \
                                                                           \
   /************/                                                          \
   /* GC types */                                                          \

src/java.base/share/classes/java/lang/System.java

@@ -2642,6 +2642,10 @@ public Object stringConcat1(String[] constants) {
                 return new StringConcatHelper.Concat1(constants);
             }
 
+            public byte stringInitCoder() {
+                return String.COMPACT_STRINGS ? String.LATIN1 : String.UTF16;
+            }
+
             public int getCharsLatin1(long i, int index, byte[] buf) {
                 return StringLatin1.getChars(i, index, buf);
             }

src/java.base/share/classes/java/lang/invoke/StringConcatFactory.java

@@ -1196,9 +1196,14 @@ private static MethodTypeDesc prependArgs(MethodType concatArgs) {
 
         /**
          * Construct the MethodType of the coder method. The first parameter is the initialized coder.
-         * Only parameter types which can be UTF16 are added. Returns null if no such parameter exists.
+         * Only parameter types which can be UTF16 are added.
+         * Returns null if no such parameter exists or CompactStrings is off.
          */
         private static MethodTypeDesc coderArgsIfMaybeUTF16(MethodType concatArgs) {
+            if (JLA.stringInitCoder() != 0) {
+                return null;
+            }
+
             int parameterCount = concatArgs.parameterCount();
 
             int maybeUTF16Count = 0;

src/java.base/share/classes/jdk/internal/access/JavaLangAccess.java

@@ -459,6 +459,11 @@ public interface JavaLangAccess {
 
     Object stringConcat1(String[] constants);
 
+    /**
+     * Get the string initial coder, When COMPACT_STRINGS is on, it returns 0, and when it is off, it returns 1.
+     */
+    byte stringInitCoder();
+
     /**
      * Join strings
      */