Share intrinsification framework across architectures, started on instrinsification in the new comp…

runtime/vm/intrinsifier.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.
+// Class for intrinsifying functions.
+
+#include "vm/intrinsifier.h"
+#include "vm/flags.h"
+#include "vm/object.h"
+
+namespace dart {
+
+DEFINE_FLAG(bool, intrinsify, true, "Instrinsify when possible");
+
+
+static bool CompareNames(const char* test_name, const char* name) {
+  if (strcmp(test_name, name) == 0) {
+    return true;
+  }
+  if ((name[0] == '_') && (test_name[0] == '_')) {
+    // Check if the private class is member of corelib and matches the
+    // test_class_name.
+    const Library& core_lib = Library::Handle(Library::CoreLibrary());
+    const Library& core_impl_lib = Library::Handle(Library::CoreImplLibrary());
+    String& test_str = String::Handle(String::New(test_name));
+    String& test_str_with_key = String::Handle();
+    test_str_with_key =
+        String::Concat(test_str, String::Handle(core_lib.private_key()));
+    if (strcmp(test_str_with_key.ToCString(), name) == 0) {
+      return true;
+    }
+    test_str_with_key =
+        String::Concat(test_str, String::Handle(core_impl_lib.private_key()));
+    if (strcmp(test_str_with_key.ToCString(), name) == 0) {
+      return true;
+    }
+  }
+  return false;
+}
+
+
+// Returns true if the function matches function_name and class_name, with
+// special recognition of corelib private classes.
+static bool TestFunction(const Function& function,
+                         const char* function_class_name,
+                         const char* function_name,
+                         const char* test_class_name,
+                         const char* test_function_name) {
+  return CompareNames(test_class_name, function_class_name) &&
+         CompareNames(test_function_name, function_name);
+}
+
+
+bool Intrinsifier::Intrinsify(const Function& function, Assembler* assembler) {
+  if (!FLAG_intrinsify) return false;
+  const char* function_name = String::Handle(function.name()).ToCString();
+  const Class& function_class = Class::Handle(function.owner());
+  const char* class_name = String::Handle(function_class.Name()).ToCString();
+  // Only core library methods can be intrinsified.
+  const Library& core_lib = Library::Handle(Library::CoreLibrary());
+  const Library& core_impl_lib = Library::Handle(Library::CoreImplLibrary());
+  if ((function_class.library() != core_lib.raw()) &&
+      (function_class.library() != core_impl_lib.raw())) {
+    return false;
+  }
+#define FIND_INTRINSICS(test_class_name, test_function_name, destination)      \
+  if (TestFunction(function,                                                   \
+                   class_name, function_name,                                  \
+                   #test_class_name, #test_function_name)) {                   \
+    return destination(assembler);                                             \
+  }                                                                            \
+
+INTRINSIC_LIST(FIND_INTRINSICS);
+#undef FIND_INTRINSICS
+  return false;
+}
+
+}  // namespace dart