8314651: G1: Fix -Wconversion warnings in static fields of HeapRegion

src/hotspot/share/gc/g1/c1/g1BarrierSetC1.cpp

@@ -158,13 +158,13 @@ void G1BarrierSetC1::post_barrier(LIRAccess& access, LIR_Opr addr, LIR_Opr new_v
     __ logical_xor(xor_res, new_val, xor_res);
     __ move(xor_res, xor_shift_res);
     __ unsigned_shift_right(xor_shift_res,
-                            LIR_OprFact::intConst(HeapRegion::LogOfHRGrainBytes),
+                            LIR_OprFact::intConst(checked_cast<jint>(HeapRegion::LogOfHRGrainBytes)),
                             xor_shift_res,
                             LIR_Opr::illegalOpr());
   } else {
     __ logical_xor(addr, new_val, xor_res);
     __ unsigned_shift_right(xor_res,
-                            LIR_OprFact::intConst(HeapRegion::LogOfHRGrainBytes),
+                            LIR_OprFact::intConst(checked_cast<jint>(HeapRegion::LogOfHRGrainBytes)),
                             xor_shift_res,
                             LIR_Opr::illegalOpr());
   }

src/hotspot/share/gc/g1/c2/g1BarrierSetC2.cpp

@@ -454,7 +454,7 @@ void G1BarrierSetC2::post_barrier(GraphKit* kit,
     // Should be able to do an unsigned compare of region_size instead of
     // and extra shift. Do we have an unsigned compare??
     // Node* region_size = __ ConI(1 << HeapRegion::LogOfHRGrainBytes);
-    Node* xor_res =  __ URShiftX ( __ XorX( cast,  __ CastPX(__ ctrl(), val)), __ ConI(HeapRegion::LogOfHRGrainBytes));
+    Node* xor_res =  __ URShiftX ( __ XorX( cast,  __ CastPX(__ ctrl(), val)), __ ConI(checked_cast<jint>(HeapRegion::LogOfHRGrainBytes)));
 
     // if (xor_res == 0) same region so skip
     __ if_then(xor_res, BoolTest::ne, zeroX, likely); {

src/hotspot/share/gc/g1/g1Arguments.cpp

@@ -30,6 +30,7 @@
 #include "gc/g1/g1CollectedHeap.inline.hpp"
 #include "gc/g1/g1HeapVerifier.hpp"
 #include "gc/g1/heapRegion.hpp"
+#include "gc/g1/heapRegionBounds.inline.hpp"
 #include "gc/g1/heapRegionRemSet.hpp"
 #include "gc/shared/cardTable.hpp"
 #include "gc/shared/gcArguments.hpp"
@@ -131,11 +132,13 @@ void G1Arguments::initialize_mark_stack_size() {
 void G1Arguments::initialize_card_set_configuration() {
   assert(HeapRegion::LogOfHRGrainBytes != 0, "not initialized");
   // Array of Cards card set container globals.
-  const int LOG_M = 20;
-  uint region_size_log_mb = (uint)MAX2(HeapRegion::LogOfHRGrainBytes - LOG_M, 0);
+  const uint LOG_M = 20;
+  assert(log2i_exact(HeapRegionBounds::min_size()) == LOG_M, "inv");
+  assert(HeapRegion::LogOfHRGrainBytes >= LOG_M, "from the above");
+  uint region_size_log_mb = HeapRegion::LogOfHRGrainBytes - LOG_M;
 
   if (FLAG_IS_DEFAULT(G1RemSetArrayOfCardsEntries)) {
-    uint max_cards_in_inline_ptr = G1CardSetConfiguration::max_cards_in_inline_ptr(HeapRegion::LogOfHRGrainBytes - CardTable::card_shift());
+    uint max_cards_in_inline_ptr = G1CardSetConfiguration::max_cards_in_inline_ptr(HeapRegion::LogCardsPerRegion);
     FLAG_SET_ERGO(G1RemSetArrayOfCardsEntries, MAX2(max_cards_in_inline_ptr * 2,
                                                     G1RemSetArrayOfCardsEntriesBase << region_size_log_mb));
   }

src/hotspot/share/gc/g1/g1CardTable.inline.hpp

@@ -31,7 +31,7 @@
 
 inline uint G1CardTable::region_idx_for(CardValue* p) {
   size_t const card_idx = pointer_delta(p, _byte_map, sizeof(CardValue));
-  return (uint)(card_idx >> (HeapRegion::LogOfHRGrainBytes - _card_shift));
+  return (uint)(card_idx >> HeapRegion::LogCardsPerRegion);
 }
 
 inline bool G1CardTable::mark_clean_as_dirty(CardValue* card) {

src/hotspot/share/gc/g1/heapRegion.cpp

@@ -48,8 +48,8 @@
 #include "runtime/globals_extension.hpp"
 #include "utilities/powerOfTwo.hpp"
 
-int    HeapRegion::LogOfHRGrainBytes = 0;
-int    HeapRegion::LogCardsPerRegion = 0;
+uint   HeapRegion::LogOfHRGrainBytes = 0;
+uint   HeapRegion::LogCardsPerRegion = 0;
 size_t HeapRegion::GrainBytes        = 0;
 size_t HeapRegion::GrainWords        = 0;
 size_t HeapRegion::CardsPerRegion    = 0;
@@ -78,12 +78,9 @@ void HeapRegion::setup_heap_region_size(size_t max_heap_size) {
   // Now make sure that we don't go over or under our limits.
   region_size = clamp(region_size, HeapRegionBounds::min_size(), HeapRegionBounds::max_size());
 
-  // Calculate the log for the region size.
-  int region_size_log = log2i_exact(region_size);
-
   // Now, set up the globals.
   guarantee(LogOfHRGrainBytes == 0, "we should only set it once");
-  LogOfHRGrainBytes = region_size_log;
+  LogOfHRGrainBytes = log2i_exact(region_size);
 
   guarantee(GrainBytes == 0, "we should only set it once");
   GrainBytes = region_size;
@@ -94,7 +91,7 @@ void HeapRegion::setup_heap_region_size(size_t max_heap_size) {
   guarantee(CardsPerRegion == 0, "we should only set it once");
   CardsPerRegion = GrainBytes >> G1CardTable::card_shift();
 
-  LogCardsPerRegion = log2i(CardsPerRegion);
+  LogCardsPerRegion = log2i_exact(CardsPerRegion);
 
   if (G1HeapRegionSize != GrainBytes) {
     FLAG_SET_ERGO(G1HeapRegionSize, GrainBytes);

src/hotspot/share/gc/g1/heapRegion.hpp

@@ -289,16 +289,15 @@ class HeapRegion : public CHeapObj<mtGC> {
   // there's clearing to be done ourselves. We also always mangle the space.
   void initialize(bool clear_space = false, bool mangle_space = SpaceDecorator::Mangle);
 
-  static int    LogOfHRGrainBytes;
-  static int    LogCardsPerRegion;
+  static uint   LogOfHRGrainBytes;
+  static uint   LogCardsPerRegion;
 
   static size_t GrainBytes;
   static size_t GrainWords;
   static size_t CardsPerRegion;
 
   static size_t align_up_to_region_byte_size(size_t sz) {
-    return (sz + (size_t) GrainBytes - 1) &
-                                      ~((1 << (size_t) LogOfHRGrainBytes) - 1);
+    return align_up(sz, GrainBytes);
   }
 
   // Returns whether a field is in the same region as the obj it points to.

src/hotspot/share/gc/g1/vmStructs_g1.hpp

@@ -35,7 +35,7 @@
                         static_field)                                         \
                                                                               \
   static_field(HeapRegion, GrainBytes,        size_t)                         \
-  static_field(HeapRegion, LogOfHRGrainBytes, int)                            \
+  static_field(HeapRegion, LogOfHRGrainBytes, uint)                           \
                                                                               \
   nonstatic_field(HeapRegion, _type,           HeapRegionType)                \
   nonstatic_field(HeapRegion, _bottom,         HeapWord* const)               \

src/hotspot/share/jvmci/jvmciCompilerToVMInit.cpp

@@ -399,6 +399,7 @@ jobjectArray readConfiguration0(JNIEnv *env, JVMCI_TRAPS) {
         assert(box.is_non_null(), "must have a box");
       } else if (strcmp(vmField.typeString, "int") == 0 ||
                  strcmp(vmField.typeString, "jint") == 0 ||
+                 strcmp(vmField.typeString, "uint") == 0 ||
                  strcmp(vmField.typeString, "uint32_t") == 0) {
         BOXED_LONG(box, *(jint*) vmField.address);
         assert(box.is_non_null(), "must have a box");

src/hotspot/share/jvmci/vmStructs_jvmci.cpp

@@ -817,7 +817,7 @@
 #if INCLUDE_G1GC
 
 #define VM_STRUCTS_JVMCI_G1GC(nonstatic_field, static_field) \
-  static_field(HeapRegion, LogOfHRGrainBytes, int)
+  static_field(HeapRegion, LogOfHRGrainBytes, uint)
 
 #define VM_INT_CONSTANTS_JVMCI_G1GC(declare_constant, declare_constant_with_value, declare_preprocessor_constant) \
   declare_constant_with_value("G1CardTable::g1_young_gen", G1CardTable::g1_young_card_val()) \