Use direct jump and call instruction for X64 when the deoptimization entries are in the code range

src/x64/assembler-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 338 matching lines @@
 // -----------------------------------------------------------------------------
 // Implementation of Assembler.
 
 #ifdef GENERATED_CODE_COVERAGE
 static void InitCoverageLog();
 #endif
 
 Assembler::Assembler(Isolate* isolate, void* buffer, int buffer_size)
     : AssemblerBase(isolate, buffer, buffer_size),
       code_targets_(100),
+      runtime_entries_(100),

[danno, 2013/03/07 14:57:23]

Ad previously commented, I don't think you need this.

[haitao.feng, 2013/03/08 05:30:05]

Done.

       positions_recorder_(this) {
   // Clear the buffer in debug mode unless it was provided by the
   // caller in which case we can't be sure it's okay to overwrite
   // existing code in it.
 #ifdef DEBUG
   if (own_buffer_) {
     memset(buffer_, 0xCC, buffer_size_);  // int3
   }
 #endif
 
@@ skipping 464 matching lines @@
     L->link_to(pc_offset() - sizeof(int32_t));
   } else {
     ASSERT(L->is_unused());
     int32_t current = pc_offset();
     emitl(current);
     L->link_to(current);
   }
 }
 
 
+void Assembler::call(Address entry, RelocInfo::Mode rmode) {
+  ASSERT(RelocInfo::IsRuntimeEntry(rmode));
+  positions_recorder()->WriteRecordedPositions();
+  EnsureSpace ensure_space(this);
+  // 1110 1000 #32-bit disp.
+  emit(0xE8);
+  emit_runtime_entry(entry, rmode);
+}
+
+
 void Assembler::call(Handle<Code> target,
                      RelocInfo::Mode rmode,
                      TypeFeedbackId ast_id) {
   positions_recorder()->WriteRecordedPositions();
   EnsureSpace ensure_space(this);
   // 1110 1000 #32-bit disp.
   emit(0xE8);
   emit_code_target(target, rmode, ast_id);
 }
 
@@ skipping 386 matching lines @@
     ASSERT(L->is_unused());
     emit(0x0F);
     emit(0x80 | cc);
     int32_t current = pc_offset();
     emitl(current);
     L->link_to(current);
   }
 }
 
 
+void Assembler::j(Condition cc, Address entry, RelocInfo::Mode rmode) {
+  ASSERT(RelocInfo::IsRuntimeEntry(rmode));
+  EnsureSpace ensure_space(this);
+  ASSERT(is_uint4(cc));
+  emit(0x0F);
+  emit(0x80 | cc);
+  emit_runtime_entry(entry, rmode);
+}
+
+
 void Assembler::j(Condition cc,
                   Handle<Code> target,
                   RelocInfo::Mode rmode) {
   EnsureSpace ensure_space(this);
   ASSERT(is_uint4(cc));
   // 0000 1111 1000 tttn #32-bit disp.
   emit(0x0F);
   emit(0x80 | cc);
   emit_code_target(target, rmode);
 }
@@ skipping 42 matching lines @@
 
 
 void Assembler::jmp(Handle<Code> target, RelocInfo::Mode rmode) {
   EnsureSpace ensure_space(this);
   // 1110 1001 #32-bit disp.
   emit(0xE9);
   emit_code_target(target, rmode);
 }
 
 
+void Assembler::jmp(Address entry, RelocInfo::Mode rmode) {
+  ASSERT(RelocInfo::IsRuntimeEntry(rmode));
+  EnsureSpace ensure_space(this);
+  ASSERT(RelocInfo::IsRuntimeEntry(rmode));
+  emit(0xE9);
+  emit_runtime_entry(entry, rmode);
+}
+
+
 void Assembler::jmp(Register target) {
   EnsureSpace ensure_space(this);
   // Opcode FF/4 r64.
   emit_optional_rex_32(target);
   emit(0xFF);
   emit_modrm(0x4, target);
 }
 
 
 void Assembler::jmp(const Operand& src) {
@@ skipping 1720 matching lines @@
 
 void Assembler::RecordComment(const char* msg, bool force) {
   if (FLAG_code_comments || force) {
     EnsureSpace ensure_space(this);
     RecordRelocInfo(RelocInfo::COMMENT, reinterpret_cast<intptr_t>(msg));
   }
 }
 
 
 const int RelocInfo::kApplyMask = RelocInfo::kCodeTargetMask |
+    1 << RelocInfo::RUNTIME_ENTRY |
     1 << RelocInfo::INTERNAL_REFERENCE |
     1 << RelocInfo::CODE_AGE_SEQUENCE;
 
 
 bool RelocInfo::IsCodedSpecially() {
   // The deserializer needs to know whether a pointer is specially coded.  Being
   // specially coded on x64 means that it is a relative 32 bit address, as used
   // by branch instructions.
   return (1 << rmode_) & kApplyMask;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64