Allow a platform to indicate that some CPU features are always...

src/ia32/assembler-ia32.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 31 matching lines @@
 
 namespace v8 {
 namespace internal {
 
 // -----------------------------------------------------------------------------
 // Implementation of CpuFeatures
 
 // Safe default is no features.
 uint64_t CpuFeatures::supported_ = 0;
 uint64_t CpuFeatures::enabled_ = 0;
+uint64_t CpuFeatures::found_by_runtime_probing_ = 0;
 
 
 // The Probe method needs executable memory, so it uses Heap::CreateCode.
 // Allocation failure is silent and leads to safe default.
 void CpuFeatures::Probe() {
   ASSERT(Heap::HasBeenSetup());
   ASSERT(supported_ == 0);
-  if (Serializer::enabled()) return;  // No features if we might serialize.
+  if (Serializer::enabled()) {
+    supported_ |= OS::CpuFeaturesImpliedByPlatform();
+    return;  // No features if we might serialize.
+  }
 
   Assembler assm(NULL, 0);
   Label cpuid, done;
 #define __ assm.
   // Save old esp, since we are going to modify the stack.
   __ push(ebp);
   __ pushfd();
   __ push(ecx);
   __ push(ebx);
   __ mov(ebp, Operand(esp));
@@ skipping 47 matching lines @@
   Object* code = Heap::CreateCode(desc,
                                   NULL,
                                   Code::ComputeFlags(Code::STUB),
                                   Handle<Code>::null());
   if (!code->IsCode()) return;
   LOG(CodeCreateEvent(Logger::BUILTIN_TAG,
                       Code::cast(code), "CpuFeatures::Probe"));
   typedef uint64_t (*F0)();
   F0 probe = FUNCTION_CAST<F0>(Code::cast(code)->entry());
   supported_ = probe();
+  found_by_runtime_probing_ = supported_;
+  uint64_t os_guarantees = OS::CpuFeaturesImpliedByPlatform();
+  supported_ |= os_guarantees;
+  found_by_runtime_probing_ &= ~os_guarantees;
 }
 
 
 // -----------------------------------------------------------------------------
 // Implementation of Displacement
 
 void Displacement::init(Label* L, Type type) {
   ASSERT(!L->is_bound());
   int next = 0;
   if (L->is_linked()) {
@@ skipping 216 matching lines @@
 
 void Assembler::Align(int m) {
   ASSERT(IsPowerOf2(m));
   while ((pc_offset() & (m - 1)) != 0) {
     nop();
   }
 }
 
 
 void Assembler::cpuid() {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::CPUID));
+  ASSERT(CpuFeatures::IsEnabled(CPUID));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0x0F);
   EMIT(0xA2);
 }
 
 
 void Assembler::pushad() {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
@@ skipping 331 matching lines @@
 void Assembler::movzx_w(Register dst, const Operand& src) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0x0F);
   EMIT(0xB7);
   emit_operand(dst, src);
 }
 
 
 void Assembler::cmov(Condition cc, Register dst, int32_t imm32) {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::CMOV));
+  ASSERT(CpuFeatures::IsEnabled(CMOV));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   UNIMPLEMENTED();
   USE(cc);
   USE(dst);
   USE(imm32);
 }
 
 
 void Assembler::cmov(Condition cc, Register dst, Handle<Object> handle) {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::CMOV));
+  ASSERT(CpuFeatures::IsEnabled(CMOV));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   UNIMPLEMENTED();
   USE(cc);
   USE(dst);
   USE(handle);
 }
 
 
 void Assembler::cmov(Condition cc, Register dst, const Operand& src) {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::CMOV));
+  ASSERT(CpuFeatures::IsEnabled(CMOV));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   // Opcode: 0f 40 + cc /r
   EMIT(0x0F);
   EMIT(0x40 + cc);
   emit_operand(dst, src);
 }
 
 
 void Assembler::xchg(Register dst, Register src) {
@@ skipping 561 matching lines @@
 
 
 void Assembler::nop() {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0x90);
 }
 
 
 void Assembler::rdtsc() {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::RDTSC));
+  ASSERT(CpuFeatures::IsEnabled(RDTSC));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0x0F);
   EMIT(0x31);
 }
 
 
 void Assembler::ret(int imm16) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
@@ skipping 325 matching lines @@
 
 void Assembler::fistp_s(const Operand& adr) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0xDB);
   emit_operand(ebx, adr);
 }
 
 
 void Assembler::fisttp_s(const Operand& adr) {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE3));
+  ASSERT(CpuFeatures::IsEnabled(SSE3));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0xDB);
   emit_operand(ecx, adr);
 }
 
 
 void Assembler::fist_s(const Operand& adr) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
@@ skipping 240 matching lines @@
   ASSERT(reg.is_byte_register());
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0x0F);
   EMIT(0x90 | cc);
   EMIT(0xC0 | reg.code());
 }
 
 
 void Assembler::cvttss2si(Register dst, const Operand& src) {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
+  ASSERT(CpuFeatures::IsEnabled(SSE2));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0xF3);
   EMIT(0x0F);
   EMIT(0x2C);
   emit_operand(dst, src);
 }
 
 
 void Assembler::cvttsd2si(Register dst, const Operand& src) {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
+  ASSERT(CpuFeatures::IsEnabled(SSE2));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0xF2);
   EMIT(0x0F);
   EMIT(0x2C);
   emit_operand(dst, src);
 }
 
 
 void Assembler::cvtsi2sd(XMMRegister dst, const Operand& src) {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
+  ASSERT(CpuFeatures::IsEnabled(SSE2));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0xF2);
   EMIT(0x0F);
   EMIT(0x2A);
   emit_sse_operand(dst, src);
 }
 
 
 void Assembler::addsd(XMMRegister dst, XMMRegister src) {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
+  ASSERT(CpuFeatures::IsEnabled(SSE2));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0xF2);
   EMIT(0x0F);
   EMIT(0x58);
   emit_sse_operand(dst, src);
 }
 
 
 void Assembler::mulsd(XMMRegister dst, XMMRegister src) {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
+  ASSERT(CpuFeatures::IsEnabled(SSE2));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0xF2);
   EMIT(0x0F);
   EMIT(0x59);
   emit_sse_operand(dst, src);
 }
 
 
 void Assembler::subsd(XMMRegister dst, XMMRegister src) {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
+  ASSERT(CpuFeatures::IsEnabled(SSE2));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0xF2);
   EMIT(0x0F);
   EMIT(0x5C);
   emit_sse_operand(dst, src);
 }
 
 
 void Assembler::divsd(XMMRegister dst, XMMRegister src) {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
+  ASSERT(CpuFeatures::IsEnabled(SSE2));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0xF2);
   EMIT(0x0F);
   EMIT(0x5E);
   emit_sse_operand(dst, src);
 }
 
 
 void Assembler::comisd(XMMRegister dst, XMMRegister src) {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
+  ASSERT(CpuFeatures::IsEnabled(SSE2));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0x66);
   EMIT(0x0F);
   EMIT(0x2F);
   emit_sse_operand(dst, src);
 }
 
 
 void Assembler::movdbl(XMMRegister dst, const Operand& src) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   movsd(dst, src);
 }
 
 
 void Assembler::movdbl(const Operand& dst, XMMRegister src) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   movsd(dst, src);
 }
 
 
 void Assembler::movsd(const Operand& dst, XMMRegister src ) {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
+  ASSERT(CpuFeatures::IsEnabled(SSE2));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0xF2);  // double
   EMIT(0x0F);
   EMIT(0x11);  // store
   emit_sse_operand(src, dst);
 }
 
 
 void Assembler::movsd(XMMRegister dst, const Operand& src) {
-  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
+  ASSERT(CpuFeatures::IsEnabled(SSE2));
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   EMIT(0xF2);  // double
   EMIT(0x0F);
   EMIT(0x10);  // load
   emit_sse_operand(dst, src);
 }
 
 
 void Assembler::emit_sse_operand(XMMRegister reg, const Operand& adr) {
@@ skipping 188 matching lines @@
 
 void Assembler::dd(uint32_t data, RelocInfo::Mode reloc_info) {
   EnsureSpace ensure_space(this);
   emit(data, reloc_info);
 }
 
 
 void Assembler::RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data) {
   ASSERT(rmode != RelocInfo::NONE);
   // Don't record external references unless the heap will be serialized.
-  if (rmode == RelocInfo::EXTERNAL_REFERENCE &&
-      !Serializer::enabled() &&
-      !FLAG_debug_code) {
-    return;
+  if (rmode == RelocInfo::EXTERNAL_REFERENCE) {
+#ifdef DEBUG
+    if (!Serializer::enabled()) {
+      Serializer::TooLateToEnableNow();
+    }
+#endif
+    if (!Serializer::enabled() && !FLAG_debug_code) {
+      return;
+    }
   }
   RelocInfo rinfo(pc_, rmode, data);
   reloc_info_writer.Write(&rinfo);
 }
 
 
 #ifdef GENERATED_CODE_COVERAGE
 static FILE* coverage_log = NULL;
 
 
@@ skipping 12 matching lines @@
   push_insn[1] = 13;    // Skip over coverage insns.
   if (coverage_log != NULL) {
     fprintf(coverage_log, "%s\n", file_line);
     fflush(coverage_log);
   }
 }
 
 #endif
 
 } }  // namespace v8::internal