Toward precompiled snapshots.

runtime/bin/main.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_tools_api.h"
@@ skipping 58 matching lines @@
 // Global flag that is used to indicate that we want to compile all the
 // dart functions and not run anything.
 static bool has_compile_all = false;
 
 
 // Global flag that is used to indicate that we want to compile all the
 // dart functions before running main and not compile anything thereafter.
 static bool has_precompile = false;
 
 
+// Global flag that is used to indicate that we want to run from a precompiled
+// snapshot.
+static bool has_precompiled = false;
+
+
 // Global flag that is used to indicate that we want to trace resolution of
 // URIs and the loading of libraries, parts and scripts.
 static bool has_trace_loading = false;
 
 
 static const char* DEFAULT_VM_SERVICE_SERVER_IP = "127.0.0.1";
 static const int DEFAULT_VM_SERVICE_SERVER_PORT = 8181;
 // VM Service options.
 static bool start_vm_service = false;
 static const char* vm_service_server_ip = DEFAULT_VM_SERVICE_SERVER_IP;
@@ skipping 205 matching lines @@
   ASSERT(arg != NULL);
   if (*arg != '\0') {
     return false;
   }
   has_precompile = true;
   vm_options->AddArgument("--precompile");
   return true;
 }
 
 
+static bool ProcessPrecompiledOption(const char* arg,
+                                     CommandLineOptions* vm_options) {
+  ASSERT(arg != NULL);
+  if (*arg != '\0') {
+    return false;
+  }
+  has_precompiled = true;
+  vm_options->AddArgument("--precompile");
+  return true;
+}
+
+
 static bool ProcessDebugOption(const char* option_value,
                                CommandLineOptions* vm_options) {
   ASSERT(option_value != NULL);
   if (!ExtractPortAndIP(option_value, &debug_port, &debug_ip,
                         DEFAULT_DEBUG_PORT, DEFAULT_DEBUG_IP)) {
     Log::PrintErr("unrecognized --debug option syntax. "
                   "Use --debug[:<port number>[/<IPv4 address>]]\n");
     return false;
   }
 
@@ skipping 91 matching lines @@
   { "-h", ProcessHelpOption },
   { "--verbose", ProcessVerboseOption },
   { "-v", ProcessVerboseOption },
   { "--package-root=", ProcessPackageRootOption },
   { "--packages=", ProcessPackagesOption },
   { "-D", ProcessEnvironmentOption },
   // VM specific options to the standalone dart program.
   { "--break-at=", ProcessBreakpointOption },
   { "--compile_all", ProcessCompileAllOption },
   { "--precompile", ProcessPrecompileOption },
+  { "--precompiled", ProcessPrecompiledOption },
   { "--debug", ProcessDebugOption },
   { "--snapshot=", ProcessGenScriptSnapshotOption },
   { "--enable-vm-service", ProcessEnableVmServiceOption },
   { "--observe", ProcessObserveOption },
   { "--trace-debug-protocol", ProcessTraceDebugProtocolOption },
   { "--trace-loading", ProcessTraceLoadingOption},
   { NULL, NULL }
 };
 
 
@@ skipping 527 matching lines @@
 static void ServiceStreamCancelCallback(const char* stream_id) {
   if (strcmp(stream_id, kStdoutStreamId) == 0) {
     capture_stdout = false;
   } else if (strcmp(stream_id, kStderrStreamId) == 0) {
     capture_stderr = false;
   }
   capture_stdio = (capture_stdout || capture_stderr);
 }
 
 
+static void WriteSnapshotFile(const char* filename,
+                              const uint8_t* buffer,
+                              const intptr_t size) {
+  File* file = File::Open(filename, File::kWriteTruncate);
+  ASSERT(file != NULL);
+  if (!file->WriteFully(buffer, size)) {
+    Log::PrintErr("Error: Failed to write snapshot file.\n\n");
+  }
+  delete file;
+}
+
+
 void main(int argc, char** argv) {
   char* script_name;
   const int EXTRA_VM_ARGUMENTS = 2;
   CommandLineOptions vm_options(argc + EXTRA_VM_ARGUMENTS);
   CommandLineOptions dart_options(argc);
   bool print_flags_seen = false;
   bool verbose_debug_seen = false;
 
   vm_options.AddArgument("--no_write_protect_code");
   // Perform platform specific initialization.
@@ skipping 53 matching lines @@
     ASSERT(debug_port >= 0);
     bool print_msg = verbose_debug_seen || (debug_port == 0);
     debug_port = DebuggerConnectionHandler::StartHandler(debug_ip, debug_port);
     if (print_msg) {
       Log::Print("Debugger listening on port %d\n", debug_port);
     }
   } else {
     DebuggerConnectionHandler::InitForVmService();
   }
 
+  const uint8_t* instructions_snapshot = NULL;
+  if (has_precompiled) {

[rmacnak, 2015/08/27 00:22:29]

For now, load everything from files. The embedder is of course free to
statically link these.

+    const char* kPrecompiledLibName = "libprecompiled.so";
+    const char* kPrecompiledSymName = "kInstructionsSnapshot";
+    const char* kPrecompiledVmIsolateName = "precompiled.vmisolate";
+    const char* kPrecompiledIsolateName = "precompiled.isolate";
+
+    void* precompiled_lib =
+        Extensions::LoadExtensionLibrary(kPrecompiledLibName);
+    if (precompiled_lib == NULL) {
+      fprintf(stderr, "Failed to load library '%s'\n", kPrecompiledLibName);
+      fflush(stderr);
+      exit(kErrorExitCode);
+    }
+
+    instructions_snapshot = reinterpret_cast<const uint8_t*>(
+        Extensions::ResolveSymbol(precompiled_lib, kPrecompiledSymName));
+    if (instructions_snapshot == NULL) {
+      fprintf(stderr, "Failed to load symbol '%s'\n", kPrecompiledSymName);
+      fflush(stderr);
+      exit(kErrorExitCode);
+    }
+
+    void* file = DartUtils::OpenFile(kPrecompiledVmIsolateName, false);
+    if (file == NULL) {
+      fprintf(stderr, "Failed to open '%s'\n", kPrecompiledVmIsolateName);
+      fflush(stderr);
+      exit(kErrorExitCode);
+    }
+    intptr_t len = -1;
+    DartUtils::ReadFile(&vm_isolate_snapshot_buffer, &len, file);
+    if (vm_isolate_snapshot_buffer == NULL || len == -1) {
+      fprintf(stderr, "Failed to read '%s'\n", kPrecompiledVmIsolateName);
+      fflush(stderr);
+      exit(kErrorExitCode);
+    }
+    DartUtils::CloseFile(file);
+
+    file = DartUtils::OpenFile(kPrecompiledIsolateName, false);
+    if (file == NULL) {
+      fprintf(stderr, "Failed to open '%s'\n", kPrecompiledIsolateName);
+      fflush(stderr);
+      exit(kErrorExitCode);
+    }
+    len = -1;
+    DartUtils::ReadFile(&isolate_snapshot_buffer, &len, file);
+    if (isolate_snapshot_buffer == NULL || len == -1) {
+      fprintf(stderr, "Failed to read '%s'\n", kPrecompiledVmIsolateName);
+      fflush(stderr);
+      exit(kErrorExitCode);
+    }
+    DartUtils::CloseFile(file);
+  }
+
   // Initialize the Dart VM.
-  if (!Dart_Initialize(vm_isolate_snapshot_buffer, NULL,
+  if (!Dart_Initialize(vm_isolate_snapshot_buffer, instructions_snapshot,
                        CreateIsolateAndSetup, NULL, NULL, ShutdownIsolate,
                        DartUtils::OpenFile,
                        DartUtils::ReadFile,
                        DartUtils::WriteFile,
                        DartUtils::CloseFile,
                        DartUtils::EntropySource)) {
     fprintf(stderr, "%s", "VM initialization failed\n");
     fflush(stderr);
     exit(kErrorExitCode);
   }
@@ skipping 60 matching lines @@
     // Import the root library into the builtin library so that we can easily
     // lookup the main entry point exported from the root library.
     Dart_Handle builtin_lib =
         Builtin::LoadAndCheckLibrary(Builtin::kBuiltinLibrary);
     ASSERT(!Dart_IsError(builtin_lib));
     result = Dart_LibraryImportLibrary(builtin_lib, root_lib, Dart_Null());
 
     if (has_precompile) {
       result = Dart_Precompile();
       DartExitOnError(result);
+
+      uint8_t* vm_isolate_buffer = NULL;
+      intptr_t vm_isolate_size = 0;
+      uint8_t* isolate_buffer = NULL;
+      intptr_t isolate_size = 0;
+      uint8_t* instructions_buffer = NULL;
+      intptr_t instructions_size = 0;
+      result = Dart_CreatePrecompiledSnapshot(&vm_isolate_buffer,
+                                              &vm_isolate_size,
+                                              &isolate_buffer,
+                                              &isolate_size,
+                                              &instructions_buffer,
+                                              &instructions_size);
+
+      DartExitOnError(result);
+
+      WriteSnapshotFile("precompiled.vmisolate",
+                        vm_isolate_buffer,
+                        vm_isolate_size);
+      WriteSnapshotFile("precompiled.isolate",
+                        isolate_buffer,
+                        isolate_size);
+      WriteSnapshotFile("precompiled.instructions",
+                        instructions_buffer,
+                        instructions_size);
+
     } else if (has_compile_all) {
       result = Dart_CompileAll();
       DartExitOnError(result);
     }
 
     if (Dart_IsNull(root_lib)) {
       ErrorExit(kErrorExitCode,
                 "Unable to find root library for '%s'\n",
                 script_name);
     }
@@ skipping 63 matching lines @@
   exit(Process::GlobalExitCode());
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   dart::bin::main(argc, argv);
   UNREACHABLE();
 }