8305895: Implement JEP 450: Compact Object Headers (Experimental)

make/Images.gmk

@@ -132,10 +132,16 @@ CDS_DUMP_FLAGS = -Xmx128M -Xms128M
 # Helper function for creating the CDS archives for the JDK and JRE
 #
 # Param1 - VM variant (e.g., server, client, zero, ...)
-# Param2 - _nocoops, or empty
+# Param2 - _nocoops, _coh, _nocoops_coh, or empty
 define CreateCDSArchive
-  $1_$2_DUMP_EXTRA_ARG := $(if $(filter _nocoops, $2), -XX:-UseCompressedOops, )
-  $1_$2_DUMP_TYPE      := $(if $(filter _nocoops, $2), -NOCOOPS, )
+  $1_$2_COOPS_OPTION := $(if $(findstring _nocoops, $2),-XX:-UseCompressedOops)
+  # enable and also explicitly disable coh as needed.
+  ifeq ($(call isTargetCpuBits, 64), true)
+    $1_$2_COH_OPTION := -XX:+UnlockExperimentalVMOptions \
+                        $(if $(findstring _coh, $2),-XX:+UseCompactObjectHeaders,-XX:-UseCompactObjectHeaders)
+  endif
+  $1_$2_DUMP_EXTRA_ARG := $$($1_$2_COOPS_OPTION) $$($1_$2_COH_OPTION)
+  $1_$2_DUMP_TYPE      := $(if $(findstring _nocoops, $2),-NOCOOPS,)$(if $(findstring _coh, $2),-COH,)
 
   # Only G1 supports dumping the shared heap, so explicitly use G1 if the JVM supports it.
   $1_$2_CDS_DUMP_FLAGS := $(CDS_DUMP_FLAGS) $(if $(filter g1gc, $(JVM_FEATURES_$1)), -XX:+UseG1GC)
@@ -190,6 +196,14 @@ ifeq ($(BUILD_CDS_ARCHIVE), true)
     $(foreach v, $(JVM_VARIANTS), \
       $(eval $(call CreateCDSArchive,$v,_nocoops)) \
     )
+    ifeq ($(BUILD_CDS_ARCHIVE_COH), true)
+      $(foreach v, $(JVM_VARIANTS), \
+        $(eval $(call CreateCDSArchive,$v,_coh)) \
+      )
+      $(foreach v, $(JVM_VARIANTS), \
+        $(eval $(call CreateCDSArchive,$v,_nocoops_coh)) \
+      )
+    endif
   endif
 endif
 

make/autoconf/configure.ac

@@ -261,6 +261,7 @@ JDKOPT_ENABLE_DISABLE_GENERATE_CLASSLIST
 JDKOPT_EXCLUDE_TRANSLATIONS
 JDKOPT_ENABLE_DISABLE_MANPAGES
 JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE
+JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE_COH
 JDKOPT_ENABLE_DISABLE_COMPATIBLE_CDS_ALIGNMENT
 JDKOPT_SETUP_MACOSX_SIGNING
 

make/autoconf/jdk-options.m4

@@ -673,6 +673,37 @@ AC_DEFUN([JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE],
   AC_SUBST(BUILD_CDS_ARCHIVE)
 ])
 
+################################################################################
+#
+# Enable or disable the default CDS archive generation for Compact Object Headers
+#
+AC_DEFUN([JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE_COH],
+[
+  UTIL_ARG_ENABLE(NAME: cds-archive-coh, DEFAULT: auto, RESULT: BUILD_CDS_ARCHIVE_COH,
+      DESC: [enable generation of default CDS archives for compact object headers (requires --enable-cds-archive)],
+      DEFAULT_DESC: [auto],
+      CHECKING_MSG: [if default CDS archives for compact object headers should be generated],
+      CHECK_AVAILABLE: [
+        AC_MSG_CHECKING([if CDS archive with compact object headers is available])
+        if test "x$BUILD_CDS_ARCHIVE" = "xfalse"; then
+          AC_MSG_RESULT([no (CDS default archive generation is disabled)])
+          AVAILABLE=false
+        elif test "x$OPENJDK_TARGET_CPU" != "xx86_64" &&
+             test "x$OPENJDK_TARGET_CPU" != "xaarch64" &&
+             test "x$OPENJDK_TARGET_CPU" != "xppc64" &&
+             test "x$OPENJDK_TARGET_CPU" != "xppc64le" &&
+             test "x$OPENJDK_TARGET_CPU" != "xriscv64" &&
+             test "x$OPENJDK_TARGET_CPU" != "xs390x"; then
+          AC_MSG_RESULT([no (compact object headers not supported for this platform)])
+          AVAILABLE=false
+        else
+          AC_MSG_RESULT([yes])
+          AVAILABLE=true
+        fi
+      ])
+  AC_SUBST(BUILD_CDS_ARCHIVE_COH)
+])
+
 ################################################################################
 #
 # Enable the alternative CDS core region alignment

make/autoconf/spec.gmk.template

@@ -370,6 +370,7 @@ EXCLUDE_TRANSLATIONS := @EXCLUDE_TRANSLATIONS@
 BUILD_MANPAGES := @BUILD_MANPAGES@
 
 BUILD_CDS_ARCHIVE := @BUILD_CDS_ARCHIVE@
+BUILD_CDS_ARCHIVE_COH := @BUILD_CDS_ARCHIVE_COH@
 
 ENABLE_COMPATIBLE_CDS_ALIGNMENT := @ENABLE_COMPATIBLE_CDS_ALIGNMENT@
 

src/hotspot/cpu/aarch64/aarch64.ad

@@ -5756,6 +5756,10 @@ opclass memory(indirect, indIndexScaled, indIndexScaledI2L, indIndexI2L, indInde
                indirectN, indIndexScaledN, indIndexScaledI2LN, indIndexI2LN, indIndexN, indOffIN, indOffLN, indirectX2P, indOffX2P);
 
 
+opclass memory_noindex(indirect,
+                       indOffI1, indOffL1,indOffI2, indOffL2, indOffI4, indOffL4, indOffI8, indOffL8,
+                       indirectN, indOffIN, indOffLN, indirectX2P, indOffX2P);
+
 // iRegIorL2I is used for src inputs in rules for 32 bit int (I)
 // operations. it allows the src to be either an iRegI or a (ConvL2I
 // iRegL). in the latter case the l2i normally planted for a ConvL2I
@@ -6682,7 +6686,7 @@ instruct loadKlass(iRegPNoSp dst, memory8 mem)
 instruct loadNKlass(iRegNNoSp dst, memory4 mem)
 %{
   match(Set dst (LoadNKlass mem));
-  predicate(!needs_acquiring_load(n));
+  predicate(!needs_acquiring_load(n) && !UseCompactObjectHeaders);
 
   ins_cost(4 * INSN_COST);
   format %{ "ldrw  $dst, $mem\t# compressed class ptr" %}
@@ -6692,6 +6696,20 @@ instruct loadNKlass(iRegNNoSp dst, memory4 mem)
   ins_pipe(iload_reg_mem);
 %}
 
+instruct loadNKlassCompactHeaders(iRegNNoSp dst, memory_noindex mem)
+%{
+  match(Set dst (LoadNKlass mem));
+  predicate(!needs_acquiring_load(n) && UseCompactObjectHeaders);
+
+  ins_cost(4 * INSN_COST);
+  format %{ "load_narrow_klass_compact  $dst, $mem\t# compressed class ptr" %}
+  ins_encode %{
+    assert($mem$$index$$Register == noreg, "must not have indexed address");
+    __ load_narrow_klass_compact_c2($dst$$Register, $mem$$base$$Register, $mem$$disp);
+  %}
+  ins_pipe(iload_reg_mem);
+%}
+
 // Load Float
 instruct loadF(vRegF dst, memory4 mem)
 %{

src/hotspot/cpu/aarch64/c1_LIRAssembler_aarch64.cpp

@@ -2243,8 +2243,6 @@ void LIR_Assembler::emit_arraycopy(LIR_OpArrayCopy* op) {
 
   Address src_length_addr = Address(src, arrayOopDesc::length_offset_in_bytes());
   Address dst_length_addr = Address(dst, arrayOopDesc::length_offset_in_bytes());
-  Address src_klass_addr = Address(src, oopDesc::klass_offset_in_bytes());
-  Address dst_klass_addr = Address(dst, oopDesc::klass_offset_in_bytes());
 
   // test for null
   if (flags & LIR_OpArrayCopy::src_null_check) {
@@ -2305,15 +2303,7 @@ void LIR_Assembler::emit_arraycopy(LIR_OpArrayCopy* op) {
     // We don't know the array types are compatible
     if (basic_type != T_OBJECT) {
       // Simple test for basic type arrays
-      if (UseCompressedClassPointers) {
-        __ ldrw(tmp, src_klass_addr);
-        __ ldrw(rscratch1, dst_klass_addr);
-        __ cmpw(tmp, rscratch1);
-      } else {
-        __ ldr(tmp, src_klass_addr);
-        __ ldr(rscratch1, dst_klass_addr);
-        __ cmp(tmp, rscratch1);
-      }
+      __ cmp_klasses_from_objects(src, dst, tmp, rscratch1);
       __ br(Assembler::NE, *stub->entry());
     } else {
       // For object arrays, if src is a sub class of dst then we can
@@ -2435,36 +2425,14 @@ void LIR_Assembler::emit_arraycopy(LIR_OpArrayCopy* op) {
     // but not necessarily exactly of type default_type.
     Label known_ok, halt;
     __ mov_metadata(tmp, default_type->constant_encoding());
-    if (UseCompressedClassPointers) {
-      __ encode_klass_not_null(tmp);
-    }
 
     if (basic_type != T_OBJECT) {
-
-      if (UseCompressedClassPointers) {
-        __ ldrw(rscratch1, dst_klass_addr);
-        __ cmpw(tmp, rscratch1);
-      } else {
-        __ ldr(rscratch1, dst_klass_addr);
-        __ cmp(tmp, rscratch1);
-      }
+      __ cmp_klass(dst, tmp, rscratch1);
       __ br(Assembler::NE, halt);
-      if (UseCompressedClassPointers) {
-        __ ldrw(rscratch1, src_klass_addr);
-        __ cmpw(tmp, rscratch1);
-      } else {
-        __ ldr(rscratch1, src_klass_addr);
-        __ cmp(tmp, rscratch1);
-      }
+      __ cmp_klass(src, tmp, rscratch1);
       __ br(Assembler::EQ, known_ok);
     } else {
-      if (UseCompressedClassPointers) {
-        __ ldrw(rscratch1, dst_klass_addr);
-        __ cmpw(tmp, rscratch1);
-      } else {
-        __ ldr(rscratch1, dst_klass_addr);
-        __ cmp(tmp, rscratch1);
-      }
+      __ cmp_klass(dst, tmp, rscratch1);
       __ br(Assembler::EQ, known_ok);
       __ cmp(src, dst);
       __ br(Assembler::EQ, known_ok);
@@ -2547,12 +2515,7 @@ void LIR_Assembler::emit_load_klass(LIR_OpLoadKlass* op) {
     add_debug_info_for_null_check_here(info);
   }
 
-  if (UseCompressedClassPointers) {
-    __ ldrw(result, Address (obj, oopDesc::klass_offset_in_bytes()));
-    __ decode_klass_not_null(result);
-  } else {
-    __ ldr(result, Address (obj, oopDesc::klass_offset_in_bytes()));
-  }
+  __ load_klass(result, obj);
 }
 
 void LIR_Assembler::emit_profile_call(LIR_OpProfileCall* op) {

src/hotspot/cpu/aarch64/c1_MacroAssembler_aarch64.cpp

@@ -175,15 +175,19 @@ void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, i
 
 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
   assert_different_registers(obj, klass, len);
-  // This assumes that all prototype bits fit in an int32_t
-  mov(t1, (int32_t)(intptr_t)markWord::prototype().value());
-  str(t1, Address(obj, oopDesc::mark_offset_in_bytes()));
 
-  if (UseCompressedClassPointers) { // Take care not to kill klass
-    encode_klass_not_null(t1, klass);
-    strw(t1, Address(obj, oopDesc::klass_offset_in_bytes()));
+  if (UseCompactObjectHeaders) {
+    ldr(t1, Address(klass, Klass::prototype_header_offset()));
+    str(t1, Address(obj, oopDesc::mark_offset_in_bytes()));
   } else {
-    str(klass, Address(obj, oopDesc::klass_offset_in_bytes()));
+    mov(t1, checked_cast<int32_t>(markWord::prototype().value()));
+    str(t1, Address(obj, oopDesc::mark_offset_in_bytes()));
+    if (UseCompressedClassPointers) { // Take care not to kill klass
+      encode_klass_not_null(t1, klass);
+      strw(t1, Address(obj, oopDesc::klass_offset_in_bytes()));
+    } else {
+      str(klass, Address(obj, oopDesc::klass_offset_in_bytes()));
+    }
   }
 
   if (len->is_valid()) {
@@ -194,7 +198,7 @@ void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register
       // Clear gap/first 4 bytes following the length field.
       strw(zr, Address(obj, base_offset));
     }
-  } else if (UseCompressedClassPointers) {
+  } else if (UseCompressedClassPointers && !UseCompactObjectHeaders) {
     store_klass_gap(obj, zr);
   }
 }

src/hotspot/cpu/aarch64/c2_MacroAssembler_aarch64.cpp

@@ -2689,3 +2689,12 @@ bool C2_MacroAssembler::in_scratch_emit_size() {
   }
   return MacroAssembler::in_scratch_emit_size();
 }
+
+void C2_MacroAssembler::load_narrow_klass_compact_c2(Register dst, Register obj, int disp) {
+  // Note: Don't clobber obj anywhere in that method!
+
+  // The incoming address is pointing into obj-start + klass_offset_in_bytes. We need to extract
+  // obj-start, so that we can load from the object's mark-word instead.
+  ldr(dst, Address(obj, disp - oopDesc::klass_offset_in_bytes()));
+  lsr(dst, dst, markWord::klass_shift);
+}

src/hotspot/cpu/aarch64/c2_MacroAssembler_aarch64.hpp

@@ -186,4 +186,6 @@
   void vector_signum_sve(FloatRegister dst, FloatRegister src, FloatRegister zero,
                          FloatRegister one, FloatRegister vtmp, PRegister pgtmp, SIMD_RegVariant T);
 
+  void load_narrow_klass_compact_c2(Register dst, Register obj, int disp);
+
 #endif // CPU_AARCH64_C2_MACROASSEMBLER_AARCH64_HPP

src/hotspot/cpu/aarch64/compressedKlass_aarch64.cpp

@@ -117,19 +117,3 @@ char* CompressedKlassPointers::reserve_address_space_for_compressed_classes(size
 
   return result;
 }
-
-void CompressedKlassPointers::initialize(address addr, size_t len) {
-  constexpr uintptr_t unscaled_max = nth_bit(32);
-  assert(len <= unscaled_max, "Klass range larger than 32 bits?");
-
-  // Shift is always 0 on aarch64.
-  _shift = 0;
-
-  // On aarch64, we don't bother with zero-based encoding (base=0 shift>0).
-  address const end = addr + len;
-  _base = (end <= (address)unscaled_max) ? nullptr : addr;
-
-  // Remember the Klass range:
-  _klass_range_start = addr;
-  _klass_range_end = addr + len;
-}