8258075: Use auto variable declarations for enum iteration

Reviewed-by: jrose, ccheung

src/hotspot/share/ci/ciObjectFactory.cpp

@@ -123,15 +123,15 @@ void ciObjectFactory::init_shared_objects() {
 
   {
     // Create the shared symbols, but not in _shared_ci_metadata.
-    for (vmSymbolID index : EnumRange<vmSymbolID>{}) {
+    for (auto index : EnumRange<vmSymbolID>{}) {
       Symbol* vmsym = vmSymbols::symbol_at(index);
       assert(vmSymbols::find_sid(vmsym) == index, "1-1 mapping");
       ciSymbol* sym = new (_arena) ciSymbol(vmsym, index);
       init_ident_of(sym);
       _shared_ci_symbols[vmSymbols::as_int(index)] = sym;
     }
 #ifdef ASSERT
-    for (vmSymbolID index : EnumRange<vmSymbolID>{}) {
+    for (auto index : EnumRange<vmSymbolID>{}) {
       Symbol* vmsym = vmSymbols::symbol_at(index);
       ciSymbol* sym = vm_symbol_at(index);
       assert(sym->get_symbol() == vmsym, "oop must match");

src/hotspot/share/classfile/classFileParser.cpp

@@ -5302,7 +5302,7 @@ static void check_methods_for_intrinsics(const InstanceKlass* ik,
       // The check is potentially expensive, therefore it is available
       // only in debug builds.
 
-      for (vmIntrinsicID id : EnumRange<vmIntrinsicID>{}) {
+      for (auto id : EnumRange<vmIntrinsicID>{}) {
         if (vmIntrinsics::_compiledLambdaForm == id) {
           // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
           // generated for the JVM from a LambdaForm and therefore no method

src/hotspot/share/classfile/vmIntrinsics.cpp

@@ -574,7 +574,7 @@ void vmIntrinsics::init_vm_intrinsic_name_table() {
   const char** nt = &vm_intrinsic_name_table[0];
   char* string = (char*) &vm_intrinsic_name_bodies[0];
 
-  for (vmIntrinsicID index : EnumRange<vmIntrinsicID>{}) {
+  for (auto index : EnumRange<vmIntrinsicID>{}) {
     nt[as_int(index)] = string;
     string += strlen(string); // skip string body
     string += 1;              // skip trailing null
@@ -601,7 +601,7 @@ vmIntrinsics::ID vmIntrinsics::find_id(const char* name) {
     init_vm_intrinsic_name_table();
   }
 
-  for (vmIntrinsicID index : EnumRange<vmIntrinsicID>{}) {
+  for (auto index : EnumRange<vmIntrinsicID>{}) {
     if (0 == strcmp(name, nt[as_int(index)])) {
       return index;
     }

src/hotspot/share/classfile/vmSymbols.cpp

@@ -83,7 +83,7 @@ void vmSymbols::initialize(TRAPS) {
 
   if (!UseSharedSpaces) {
     const char* string = &vm_symbol_bodies[0];
-    for (vmSymbolID index : EnumRange<vmSymbolID>{}) {
+    for (auto index : EnumRange<vmSymbolID>{}) {
       Symbol* sym = SymbolTable::new_permanent_symbol(string);
       Symbol::_vm_symbols[as_int(index)] = sym;
       string += strlen(string); // skip string body
@@ -113,9 +113,9 @@ void vmSymbols::initialize(TRAPS) {
 #ifdef ASSERT
   // Check for duplicates:
 
-  for (vmSymbolID i1 : EnumRange<vmSymbolID>{}) {
+  for (auto i1 : EnumRange<vmSymbolID>{}) {
     Symbol* sym = symbol_at(i1);
-    for (vmSymbolID i2 : EnumRange<vmSymbolID>{vmSymbolID::FIRST_SID, i1}) {
+    for (auto i2 : EnumRange<vmSymbolID>{vmSymbolID::FIRST_SID, i1}) {
       if (i2 != i1 && symbol_at(i2) == sym) {
         tty->print("*** Duplicate VM symbol SIDs %s(%d) and %s(%d): \"",
                    vm_symbol_enum_name(i2), as_int(i2),
@@ -129,7 +129,7 @@ void vmSymbols::initialize(TRAPS) {
 
   // Create an index for find_id:
   {
-    for (vmSymbolID index : EnumRange<vmSymbolID>{}) {
+    for (auto index : EnumRange<vmSymbolID>{}) {
       vm_symbol_index[as_int(index)] = index;
     }
     int num_sids = SID_LIMIT-FIRST_SID;
@@ -150,7 +150,7 @@ void vmSymbols::initialize(TRAPS) {
     assert(symbol_at(sid) == jlo, "");
 
     // Make sure find_sid produces the right answer in each case.
-    for (vmSymbolID index : EnumRange<vmSymbolID>{}) {
+    for (auto index : EnumRange<vmSymbolID>{}) {
       Symbol* sym = symbol_at(index);
       sid = find_sid(sym);
       assert(sid == index, "symbol index works");
@@ -174,7 +174,7 @@ const char* vmSymbols::name_for(vmSymbolID sid) {
   if (sid == vmSymbolID::NO_SID)
     return "NO_SID";
   const char* string = &vm_symbol_bodies[0];
-  for (vmSymbolID index : EnumRange<vmSymbolID>{}) {
+  for (auto index : EnumRange<vmSymbolID>{}) {
     if (index == sid)
       return string;
     string += strlen(string); // skip string body
@@ -187,7 +187,7 @@ const char* vmSymbols::name_for(vmSymbolID sid) {
 
 
 void vmSymbols::symbols_do(SymbolClosure* f) {
-  for (vmSymbolID index : EnumRange<vmSymbolID>{}) {
+  for (auto index : EnumRange<vmSymbolID>{}) {
     f->do_symbol(&Symbol::_vm_symbols[as_int(index)]);
   }
   for (int i = 0; i < T_VOID+1; i++) {
@@ -196,7 +196,7 @@ void vmSymbols::symbols_do(SymbolClosure* f) {
 }
 
 void vmSymbols::metaspace_pointers_do(MetaspaceClosure *closure) {
-  for (vmSymbolID index : EnumRange<vmSymbolID>{}) {
+  for (auto index : EnumRange<vmSymbolID>{}) {
     closure->push(&Symbol::_vm_symbols[as_int(index)]);
   }
   for (int i = 0; i < T_VOID+1; i++) {
@@ -274,7 +274,7 @@ vmSymbolID vmSymbols::find_sid(const Symbol* symbol) {
     // Make sure this is the right answer, using linear search.
     // (We have already proven that there are no duplicates in the list.)
     vmSymbolID sid2 = vmSymbolID::NO_SID;
-    for (vmSymbolID index : EnumRange<vmSymbolID>{}) {
+    for (auto index : EnumRange<vmSymbolID>{}) {
       Symbol* sym2 = symbol_at(index);
       if (sym2 == symbol) {
         sid2 = index;

src/hotspot/share/opto/compile.cpp

@@ -234,7 +234,7 @@ void Compile::print_intrinsic_statistics() {
   if (total == 0)  total = 1;  // avoid div0 in case of no successes
   #define PRINT_STAT_LINE(name, c, f) \
     tty->print_cr("  %4d (%4.1f%%) %s (%s)", (int)(c), ((c) * 100.0) / total, name, f);
-  for (vmIntrinsicID id : EnumRange<vmIntrinsicID>{}) {
+  for (auto id : EnumRange<vmIntrinsicID>{}) {
     int   flags = _intrinsic_hist_flags[as_int(id)];
     juint count = _intrinsic_hist_count[as_int(id)];
     if ((flags | count) != 0) {

src/hotspot/share/utilities/enumIterator.hpp

@@ -59,7 +59,7 @@
 // Example:
 //
 // /* With range-base for (recommended) */
-// for (vmSymbolID index : EnumRange<vmSymbolID>{}) {
+// for (auto index : EnumRange<vmSymbolID>{}) {
 //    ....
 // }
 //