8255900: x86: Reduce impact when VerifyOops is disabled

Reviewed-by: neliasso, minqi, kvn

Author: cl4es

src/hotspot/cpu/x86/interp_masm_x86.cpp

@@ -1959,7 +1959,7 @@ void InterpreterMacroAssembler::profile_switch_case(Register index,
 
 void InterpreterMacroAssembler::_interp_verify_oop(Register reg, TosState state, const char* file, int line) {
   if (state == atos) {
-    MacroAssembler::_verify_oop(reg, "broken oop", file, line);
+    MacroAssembler::_verify_oop_checked(reg, "broken oop", file, line);
   }
 }
 

src/hotspot/cpu/x86/macroAssembler_x86.cpp

@@ -370,11 +370,6 @@ void MacroAssembler::pushptr(AddressLiteral src) {
   }
 }
 
-void MacroAssembler::set_word_if_not_zero(Register dst) {
-  xorl(dst, dst);
-  set_byte_if_not_zero(dst);
-}
-
 static void pass_arg0(MacroAssembler* masm, Register arg) {
   masm->push(arg);
 }
@@ -3993,7 +3988,6 @@ Address MacroAssembler::argument_address(RegisterOrConstant arg_slot,
   return Address(rsp, scale_reg, scale_factor, offset);
 }
 
-
 void MacroAssembler::_verify_oop_addr(Address addr, const char* s, const char* file, int line) {
   if (!VerifyOops) return;
 

src/hotspot/cpu/x86/macroAssembler_x86.hpp

@@ -583,22 +583,30 @@ class MacroAssembler: public Assembler {
   // method handles (JSR 292)
   Address argument_address(RegisterOrConstant arg_slot, int extra_slot_offset = 0);
 
-  //----
-  void set_word_if_not_zero(Register reg); // sets reg to 1 if not zero, otherwise 0
-
   // Debugging
 
   // only if +VerifyOops
   void _verify_oop(Register reg, const char* s, const char* file, int line);
   void _verify_oop_addr(Address addr, const char* s, const char* file, int line);
 
+  void _verify_oop_checked(Register reg, const char* s, const char* file, int line) {
+    if (VerifyOops) {
+      _verify_oop(reg, s, file, line);
+    }
+  }
+  void _verify_oop_addr_checked(Address reg, const char* s, const char* file, int line) {
+    if (VerifyOops) {
+      _verify_oop_addr(reg, s, file, line);
+    }
+  }
+
   // TODO: verify method and klass metadata (compare against vptr?)
   void _verify_method_ptr(Register reg, const char * msg, const char * file, int line) {}
   void _verify_klass_ptr(Register reg, const char * msg, const char * file, int line){}
 
-#define verify_oop(reg) _verify_oop(reg, "broken oop " #reg, __FILE__, __LINE__)
-#define verify_oop_msg(reg, msg) _verify_oop(reg, "broken oop " #reg ", " #msg, __FILE__, __LINE__)
-#define verify_oop_addr(addr) _verify_oop_addr(addr, "broken oop addr " #addr, __FILE__, __LINE__)
+#define verify_oop(reg) _verify_oop_checked(reg, "broken oop " #reg, __FILE__, __LINE__)
+#define verify_oop_msg(reg, msg) _verify_oop_checked(reg, "broken oop " #reg ", " #msg, __FILE__, __LINE__)
+#define verify_oop_addr(addr) _verify_oop_addr_checked(addr, "broken oop addr " #addr, __FILE__, __LINE__)
 #define verify_method_ptr(reg) _verify_method_ptr(reg, "broken method " #reg, __FILE__, __LINE__)
 #define verify_klass_ptr(reg) _verify_klass_ptr(reg, "broken klass " #reg, __FILE__, __LINE__)
 

src/hotspot/cpu/x86/stubGenerator_x86_64.cpp

@@ -6851,7 +6851,9 @@ address generate_avx_ghash_processBlocks() {
     StubRoutines::x86::_vector_iota_indices = generate_iota_indices("iota_indices");
 
     // support for verify_oop (must happen after universe_init)
-    StubRoutines::_verify_oop_subroutine_entry = generate_verify_oop();
+    if (VerifyOops) {
+      StubRoutines::_verify_oop_subroutine_entry = generate_verify_oop();
+    }
 
     // data cache line writeback
     StubRoutines::_data_cache_writeback = generate_data_cache_writeback();