when open macro GENERATED_CODE_COVERAGE, fix compiler error and fd leak

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/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/macro-assembler.h"
 #include "src/serialize.h"
@@ skipping 207 matching lines @@
     return code == base_code;
   }
 }
 
 
 // -----------------------------------------------------------------------------
 // Implementation of Assembler.
 
 #ifdef GENERATED_CODE_COVERAGE
 static void InitCoverageLog();
+static void DeinitCoverageLog();
 #endif
 
 Assembler::Assembler(Isolate* isolate, void* buffer, int buffer_size)
     : AssemblerBase(isolate, buffer, buffer_size),
       code_targets_(100),
       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
 
   reloc_info_writer.Reposition(buffer_ + buffer_size_, pc_);
 
 
 #ifdef GENERATED_CODE_COVERAGE
   InitCoverageLog();
 #endif
 }
 
+Assembler::~Assembler() {
+#ifdef GENERATED_CODE_COVERAGE
+  DeinitCoverageLog();
+#endif
+}
 
 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).
   ASSERT(pc_ <= reloc_info_writer.pos());  // No overlap.
   // Set up code descriptor.
   desc->buffer = buffer_;
   desc->buffer_size = buffer_size_;
   desc->instr_size = pc_offset();
   ASSERT(desc->instr_size > 0);  // Zero-size code objects upset the system.
@@ skipping 2703 matching lines @@
   // specially coded on x64 means that it is a relative 32 bit address, as used
   // by branch instructions.
   return (1 << rmode_) & kApplyMask;
 }
 
 
 bool RelocInfo::IsInConstantPool() {
   return false;
 }
 
+#ifdef GENERATED_CODE_COVERAGE
+static FILE* coverage_log = NULL;
+
+
+static void InitCoverageLog() {
+        char* file_name = getenv("V8_GENERATED_CODE_COVERAGE_LOG");
+        if (file_name != NULL && NULL == coverage_log) {
+                coverage_log = fopen(file_name, "aw+");
+        }
+}
+
+static void DeinitCoverageLog() {
+        if (coverage_log != NULL) {
+                fclose(coverage_log);
+                coverage_log = NULL;
+        }
+}
+
+void LogGeneratedCodeCoverage(const char* file_line) {
+        const char* return_address = (&file_line)[-1];
+        char* push_insn = const_cast<char*>(return_address - 12);
+        push_insn[0] = 0xeb;  // Relative branch insn.
+        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
 
 #endif  // V8_TARGET_ARCH_X64