[compiler] Delay allocation of code-embedded heap numbers.

src/x64/assembler-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/x64/assembler-x64.h"
 
 #include <cstring>
 
 #if V8_TARGET_ARCH_X64
 
@@ skipping 291 matching lines @@
 // existing code in it.
 #ifdef DEBUG
   if (own_buffer_) {
     memset(buffer_, 0xCC, buffer_size_);  // int3
   }
 #endif
 
   reloc_info_writer.Reposition(buffer_ + buffer_size_, pc_);
 }
 
+void Assembler::GetCode(Isolate* isolate, CodeDesc* desc) {
+  // At this point overflow() may be true, but the gap ensures
+  // that we are still not overlapping instructions and relocation info.
+  DCHECK(pc_ <= reloc_info_writer.pos());  // No overlap.
 
-void Assembler::GetCode(CodeDesc* desc) {
-  // Finalize code (at this point overflow() may be true, but the gap ensures
-  // that we are still not overlapping instructions and relocation info).
-  DCHECK(pc_ <= reloc_info_writer.pos());  // No overlap.
+  AllocateRequestedHeapNumbers(isolate);
+
   // Set up code descriptor.
   desc->buffer = buffer_;
   desc->buffer_size = buffer_size_;
   desc->instr_size = pc_offset();
   DCHECK(desc->instr_size > 0);  // Zero-size code objects upset the system.
   desc->reloc_size =
       static_cast<int>((buffer_ + buffer_size_) - reloc_info_writer.pos());
   desc->origin = this;
   desc->constant_pool_size = 0;
   desc->unwinding_info_size = 0;
@@ skipping 1204 matching lines @@
 }
 
 
 void Assembler::movp(Register dst, void* value, RelocInfo::Mode rmode) {
   EnsureSpace ensure_space(this);
   emit_rex(dst, kPointerSize);
   emit(0xB8 | dst.low_bits());
   emitp(value, rmode);
 }
 
+void Assembler::movp_heap_number(Register dst, double value) {
+  EnsureSpace ensure_space(this);
+  emit_rex(dst, kPointerSize);
+  emit(0xB8 | dst.low_bits());
+  RequestHeapNumber(value);
+  emitp(nullptr, RelocInfo::EMBEDDED_OBJECT);
+}
+
 void Assembler::movq(Register dst, int64_t value, RelocInfo::Mode rmode) {
   EnsureSpace ensure_space(this);
   emit_rex_64(dst);
   emit(0xB8 | dst.low_bits());
   if (!RelocInfo::IsNone(rmode)) {
     RecordRelocInfo(rmode, value);
   }
   emitq(value);
 }
 
@@ skipping 3234 matching lines @@
 
 bool RelocInfo::IsInConstantPool() {
   return false;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64