8362515: RISC-V: cleanup NativeFarCall

Backport-of: 3e2d12d85a35d9724c2ddf17a2dccf4b0866bc62

Author: DingliZhang

src/hotspot/cpu/riscv/nativeInst_riscv.cpp

@@ -46,44 +46,11 @@ bool NativeInstruction::is_call_at(address addr) {
 }
 
 //-----------------------------------------------------------------------------
-// NativeFarCall
-//
-// Implements direct far calling loading an address from the stub section version of reloc call.
-
-class NativeFarCall: public NativeInstruction {
- public:
-  enum RISCV_specific_constants {
-    return_address_offset       =    3 * NativeInstruction::instruction_size, // auipc + ld + jalr
-  };
-
-  address instruction_address() const       { return addr_at(0); }
-  address next_instruction_address() const  { return addr_at(return_address_offset); }
-  address return_address() const            { return addr_at(return_address_offset); }
-  address destination() const;
-  address reloc_destination();
-
-  void set_destination(address dest);
-  void verify();
-  void print();
-
-  bool set_destination_mt_safe(address dest);
-  bool reloc_set_destination(address dest);
-
- private:
-  address stub_address();
-
-  static void set_stub_address_destination_at(address dest, address value);
-  static address stub_address_destination_at(address src);
- public:
-
-  static NativeFarCall* at(address addr);
-  static bool is_at(address addr);
-  static bool is_call_before(address return_address);
-};
+// NativeCall
 
-address NativeFarCall::destination() const {
+address NativeCall::destination() const {
   address addr = instruction_address();
-  assert(NativeFarCall::is_at(addr), "unexpected code at call site");
+  assert(NativeCall::is_at(addr), "unexpected code at call site");
 
   address destination = MacroAssembler::target_addr_for_insn(addr);
 
@@ -96,9 +63,9 @@ address NativeFarCall::destination() const {
   return stub_address_destination_at(destination);
 }
 
-address NativeFarCall::reloc_destination() {
+address NativeCall::reloc_destination() {
   address call_addr = instruction_address();
-  assert(NativeFarCall::is_at(call_addr), "unexpected code at call site");
+  assert(NativeCall::is_at(call_addr), "unexpected code at call site");
 
   CodeBlob *code = CodeCache::find_blob(call_addr);
   assert(code != nullptr, "Could not find the containing code blob");
@@ -115,25 +82,19 @@ address NativeFarCall::reloc_destination() {
   return stub_addr;
 }
 
-void NativeFarCall::set_destination(address dest) {
-  address addr = instruction_address();
-  assert(NativeFarCall::is_at(addr), "unexpected code at call site");
-  Unimplemented();
-}
-
-void NativeFarCall::verify() {
-  assert(NativeFarCall::is_at(instruction_address()), "unexpected code at call site");
+void NativeCall::verify() {
+  assert(NativeCall::is_at(instruction_address()), "unexpected code at call site");
 }
 
-void NativeFarCall::print() {
-  assert(NativeFarCall::is_at(instruction_address()), "unexpected code at call site");
-  tty->print_cr(PTR_FORMAT ": auipc,ld,jalr x1, offset/reg, ", p2i(addr_at(0)));
+void NativeCall::print() {
+  assert(NativeCall::is_at(instruction_address()), "unexpected code at call site");
+  tty->print_cr(PTR_FORMAT ": auipc,ld,jalr x1, offset/reg, ", p2i(instruction_address()));
 }
 
-bool NativeFarCall::set_destination_mt_safe(address dest) {
-  assert(NativeFarCall::is_at(addr_at(0)), "unexpected code at call site");
+bool NativeCall::set_destination_mt_safe(address dest) {
+  assert(NativeCall::is_at(instruction_address()), "unexpected code at call site");
   assert((CodeCache_lock->is_locked() || SafepointSynchronize::is_at_safepoint()) ||
-         CompiledICLocker::is_safe(addr_at(0)),
+         CompiledICLocker::is_safe(instruction_address()),
          "concurrent code patching");
 
   address stub_addr = stub_address();
@@ -145,9 +106,9 @@ bool NativeFarCall::set_destination_mt_safe(address dest) {
   return false;
 }
 
-bool NativeFarCall::reloc_set_destination(address dest) {
-  address call_addr = addr_at(0);
-  assert(NativeFarCall::is_at(call_addr), "unexpected code at call site");
+bool NativeCall::reloc_set_destination(address dest) {
+  address call_addr = instruction_address();
+  assert(NativeCall::is_at(call_addr), "unexpected code at call site");
 
   CodeBlob *code = CodeCache::find_blob(call_addr);
   assert(code != nullptr, "Could not find the containing code blob");
@@ -163,39 +124,32 @@ bool NativeFarCall::reloc_set_destination(address dest) {
   return true;
 }
 
-void NativeFarCall::set_stub_address_destination_at(address dest, address value) {
+void NativeCall::set_stub_address_destination_at(address dest, address value) {
   assert_cond(dest != nullptr);
   assert_cond(value != nullptr);
 
   set_data64_at(dest, (uint64_t)value);
   OrderAccess::release();
 }
 
-address NativeFarCall::stub_address_destination_at(address src) {
+address NativeCall::stub_address_destination_at(address src) {
   assert_cond(src != nullptr);
   address dest = (address)get_data64_at(src);
   return dest;
 }
 
-address NativeFarCall::stub_address() {
-  address call_addr = addr_at(0);
+address NativeCall::stub_address() {
+  address call_addr = instruction_address();
 
   CodeBlob *code = CodeCache::find_blob(call_addr);
   assert(code != nullptr, "Could not find the containing code blob");
 
-  address dest = MacroAssembler::pd_call_destination(call_addr);
+  address dest = MacroAssembler::target_addr_for_insn(call_addr);
   assert(code->contains(dest), "Sanity");
   return dest;
 }
 
-NativeFarCall* NativeFarCall::at(address addr) {
-  assert_cond(addr != nullptr);
-  assert(NativeFarCall::is_at(addr), "unexpected code at call site: %p", addr);
-  NativeFarCall* call = (NativeFarCall*)(addr);
-  return call;
-}
-
-bool NativeFarCall::is_at(address addr) {
+bool NativeCall::is_at(address addr) {
   assert_cond(addr != nullptr);
   const int instr_size = NativeInstruction::instruction_size;
   if (MacroAssembler::is_auipc_at(addr) &&
@@ -211,59 +165,8 @@ bool NativeFarCall::is_at(address addr) {
   return false;
 }
 
-bool NativeFarCall::is_call_before(address return_address) {
-  return NativeFarCall::is_at(return_address - return_address_offset);
-}
-
-//-----------------------------------------------------------------------------
-// NativeCall
-
-address NativeCall::instruction_address() const {
-  return NativeFarCall::at(addr_at(0))->instruction_address();
-}
-
-address NativeCall::next_instruction_address() const {
-  return NativeFarCall::at(addr_at(0))->next_instruction_address();
-}
-
-address NativeCall::return_address() const {
-  return NativeFarCall::at(addr_at(0))->return_address();
-}
-
-address NativeCall::destination() const {
-  return NativeFarCall::at(addr_at(0))->destination();
-}
-
-address NativeCall::reloc_destination() {
-  return NativeFarCall::at(addr_at(0))->reloc_destination();
-}
-
-void NativeCall::set_destination(address dest) {
-  NativeFarCall::at(addr_at(0))->set_destination(dest);
-}
-
-void NativeCall::verify() {
-  NativeFarCall::at(addr_at(0))->verify();;
-}
-
-void NativeCall::print() {
-  NativeFarCall::at(addr_at(0))->print();;
-}
-
-bool NativeCall::set_destination_mt_safe(address dest) {
-  return NativeFarCall::at(addr_at(0))->set_destination_mt_safe(dest);
-}
-
-bool NativeCall::reloc_set_destination(address dest) {
-  return NativeFarCall::at(addr_at(0))->reloc_set_destination(dest);
-}
-
-bool NativeCall::is_at(address addr) {
-  return NativeFarCall::is_at(addr);
-}
-
 bool NativeCall::is_call_before(address return_address) {
-  return NativeFarCall::is_call_before(return_address);
+  return NativeCall::is_at(return_address - NativeCall::instruction_size);
 }
 
 NativeCall* nativeCall_at(address addr) {
@@ -276,7 +179,7 @@ NativeCall* nativeCall_at(address addr) {
 NativeCall* nativeCall_before(address return_address) {
   assert_cond(return_address != nullptr);
   NativeCall* call = nullptr;
-  call = (NativeCall*)(return_address - NativeFarCall::return_address_offset);
+  call = (NativeCall*)(return_address - NativeCall::instruction_size);
   DEBUG_ONLY(call->verify());
   return call;
 }

src/hotspot/cpu/riscv/nativeInst_riscv.hpp

@@ -112,41 +112,52 @@ NativeCall* nativeCall_before(address return_address);
 // The NativeCall is an abstraction for accessing/manipulating native
 // call instructions (used to manipulate inline caches, primitive &
 // DSO calls, etc.).
+// NativeCall is reloc call on RISC-V. See MacroAssembler::reloc_call.
 class NativeCall: private NativeInstruction {
  // private: when common code is using byte_size()
  private:
   enum {
     // Use byte_size() as it can be changed in runtime
     // Since instruction_size exists on NativeInstruction we need
     // to overload and hide it.
-    instruction_size = 3 * Assembler::instruction_size // auipc + ld + jalr
+    instruction_size = 3 * NativeInstruction::instruction_size // auipc + ld + jalr
   };
  public:
 
   static int byte_size() {
-    return 3 * NativeInstruction::instruction_size; // auipc + ld + jalr
+    return NativeCall::instruction_size; // auipc + ld + jalr
   }
 
   // Creation
   friend NativeCall* nativeCall_at(address addr);
   friend NativeCall* nativeCall_before(address return_address);
 
-  address instruction_address() const;
-  address next_instruction_address() const;
-  address return_address() const;
+  address instruction_address() const      { return addr_at(0); }
+  address next_instruction_address() const { return addr_at(NativeCall::instruction_size); }
+  address return_address() const           { return addr_at(NativeCall::instruction_size); }
   address destination() const;
   address reloc_destination();
 
   void verify_alignment() {} // do nothing on riscv
   void verify();
   void print();
 
-  void set_destination(address dest);
+  void set_destination(address dest) { Unimplemented(); }
+  // patch stub to target address of the reloc call
   bool set_destination_mt_safe(address dest);
+  // patch reloc call to stub address
   bool reloc_set_destination(address dest);
 
   static bool is_at(address addr);
   static bool is_call_before(address return_address);
+
+ private:
+  // return stub address, without checking stub address in locs
+  address stub_address();
+  // set target address at stub
+  static void set_stub_address_destination_at(address dest, address value);
+  // return target address at stub
+  static address stub_address_destination_at(address src);
 };
 
 // An interface for accessing/manipulating native mov reg, imm instructions.