8341692: Implement JEP 490: ZGC: Remove the Non-Generational Mode

Reviewed-by: ihse, eosterlund, stefank, prr, cjplummer, dholmes

Author: xmas92

make/RunTests.gmk

@@ -853,11 +853,7 @@ define SetupRunJtregTestBody
   endif
 
   ifneq ($$(findstring -XX:+UseZGC, $$(JTREG_ALL_OPTIONS)), )
-    ifneq ($$(findstring -XX:-ZGenerational, $$(JTREG_ALL_OPTIONS)), )
-      JTREG_AUTO_PROBLEM_LISTS += ProblemList-zgc.txt
-    else
-      JTREG_AUTO_PROBLEM_LISTS += ProblemList-generational-zgc.txt
-    endif
+    JTREG_AUTO_PROBLEM_LISTS += ProblemList-zgc.txt
   endif
 
   ifneq ($$(JTREG_EXTRA_PROBLEM_LISTS), )

make/hotspot/gensrc/GensrcAdlc.gmk

@@ -193,8 +193,6 @@ ifeq ($(call check-jvm-feature, compiler2), true)
 
   ifeq ($(call check-jvm-feature, zgc), true)
     AD_SRC_FILES += $(call uniq, $(wildcard $(foreach d, $(AD_SRC_ROOTS), \
-        $d/cpu/$(HOTSPOT_TARGET_CPU_ARCH)/gc/x/x_$(HOTSPOT_TARGET_CPU).ad \
-        $d/cpu/$(HOTSPOT_TARGET_CPU_ARCH)/gc/x/x_$(HOTSPOT_TARGET_CPU_ARCH).ad \
         $d/cpu/$(HOTSPOT_TARGET_CPU_ARCH)/gc/z/z_$(HOTSPOT_TARGET_CPU).ad \
         $d/cpu/$(HOTSPOT_TARGET_CPU_ARCH)/gc/z/z_$(HOTSPOT_TARGET_CPU_ARCH).ad \
       )))

make/hotspot/lib/JvmFeatures.gmk

@@ -150,7 +150,6 @@ endif
 ifneq ($(call check-jvm-feature, zgc), true)
   JVM_CFLAGS_FEATURES += -DINCLUDE_ZGC=0
   JVM_EXCLUDE_PATTERNS += gc/z
-  JVM_EXCLUDE_PATTERNS += gc/x
 endif
 
 ifneq ($(call check-jvm-feature, shenandoahgc), true)

src/hotspot/cpu/aarch64/c1_LIRAssembler_aarch64.cpp

@@ -990,10 +990,7 @@ void LIR_Assembler::mem2reg(LIR_Opr src, LIR_Opr dest, BasicType type, LIR_Patch
       __ decode_heap_oop(dest->as_register());
     }
 
-    if (!(UseZGC && !ZGenerational)) {
-      // Load barrier has not yet been applied, so ZGC can't verify the oop here
-      __ verify_oop(dest->as_register());
-    }
+    __ verify_oop(dest->as_register());
   }
 }