Remove is_sigill_not_entrant.

Author: TheRealMDoerr

src/hotspot/cpu/aarch64/nativeInst_aarch64.cpp

@@ -340,10 +340,6 @@ bool NativeInstruction::is_movk() {
   return Instruction_aarch64::extract(int_at(0), 30, 23) == 0b11100101;
 }
 
-bool NativeInstruction::is_sigill_not_entrant() {
-  return uint_at(0) == 0xd4bbd5a1; // dcps1 #0xdead
-}
-
 void NativeIllegalInstruction::insert(address code_pos) {
   *(juint*)code_pos = 0xd4bbd5a1; // dcps1 #0xdead
 }

src/hotspot/cpu/aarch64/nativeInst_aarch64.hpp

@@ -83,7 +83,6 @@ class NativeInstruction {
   bool is_safepoint_poll();
   bool is_movz();
   bool is_movk();
-  bool is_sigill_not_entrant();
   bool is_stop();
 
 protected:

src/hotspot/cpu/ppc/nativeInst_ppc.hpp

@@ -69,13 +69,6 @@ class NativeInstruction {
     return MacroAssembler::tdi_get_si16(long_at(0), Assembler::traptoUnconditional, 0);
   }
 
-  // We use an illtrap for marking a method as not_entrant.
-  bool is_sigill_not_entrant() {
-    // Work around a C++ compiler bug which changes 'this'.
-    return NativeInstruction::is_sigill_not_entrant_at(addr_at(0));
-  }
-  static bool is_sigill_not_entrant_at(address addr);
-
 #ifdef COMPILER2
   // SIGTRAP-based implicit range checks
   bool is_sigtrap_range_check() {

src/hotspot/cpu/riscv/nativeInst_riscv.cpp

@@ -408,12 +408,6 @@ bool NativeInstruction::is_safepoint_poll() {
   return MacroAssembler::is_lwu_to_zr(address(this));
 }
 
-// A 16-bit instruction with all bits ones is permanently reserved as an illegal instruction.
-bool NativeInstruction::is_sigill_not_entrant() {
-  // jvmci
-  return uint_at(0) == 0xffffffff;
-}
-
 void NativeIllegalInstruction::insert(address code_pos) {
   assert_cond(code_pos != nullptr);
   Assembler::sd_instr(code_pos, 0xffffffff);   // all bits ones is permanently reserved as an illegal instruction

src/hotspot/cpu/riscv/nativeInst_riscv.hpp

@@ -74,7 +74,6 @@ class NativeInstruction {
   bool is_nop() const;
   bool is_jump_or_nop();
   bool is_safepoint_poll();
-  bool is_sigill_not_entrant();
   bool is_stop();
 
  protected:

src/hotspot/cpu/s390/nativeInst_s390.hpp

@@ -85,9 +85,6 @@ class NativeInstruction {
   // Bcrl is currently the only accepted instruction here.
   bool is_jump();
 
-  // We use an illtrap for marking a method as not_entrant.
-  bool is_sigill_not_entrant();
-
   bool is_safepoint_poll() {
     // Is the current instruction a POTENTIAL read access to the polling page?
     // The instruction's current arguments are not checked!