[cleanup] Remove runtime.js, move the remainder to more logical places

This patch retires runtime.js:
  - Removes some dead code from runtime.js (ToPositiveInteger, ToIndex),
  - Moves Array.prototype initialization to prologue.js
  - Moves SpeciesConstructor to the only file that calls it (typedarray.js)
  - Renames the remainder to reflect its only inhabitants ({Max,Min}Simple)

Change-Id: If9048a30c4f6b86396bfd647bb637b4175880fc3
Reviewed-on: https://chromium-review.googlesource.com/478579
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44730}

BUILD.gn

@@ -502,7 +502,7 @@ action("js2c") {
     "src/js/macros.py",
     "src/messages.h",
     "src/js/prologue.js",
-    "src/js/runtime.js",
+    "src/js/max-min.js",
     "src/js/v8natives.js",
     "src/js/array.js",
     "src/js/string.js",

src/bootstrapper.cc

@@ -4211,11 +4211,9 @@ bool Genesis::InstallNatives(GlobalContextType context_type) {
                   factory()->NewStringFromAsciiChecked("isPromise"));
 
   int builtin_index = Natives::GetDebuggerCount();
-  // Only run prologue.js and runtime.js at this point.
+  // Only run prologue.js at this point.
   DCHECK_EQ(builtin_index, Natives::GetIndex("prologue"));
   if (!Bootstrapper::CompileBuiltin(isolate(), builtin_index++)) return false;
-  DCHECK_EQ(builtin_index, Natives::GetIndex("runtime"));
-  if (!Bootstrapper::CompileBuiltin(isolate(), builtin_index++)) return false;
 
   {
     // Builtin function for OpaqueReference -- a JSValue-based object,

src/bootstrapper.h

@@ -13,7 +13,7 @@ namespace internal {
 
 // A SourceCodeCache uses a FixedArray to store pairs of
 // (OneByteString*, JSFunction*), mapping names of native code files
-// (runtime.js, etc.) to precompiled functions. Instead of mapping
+// (array.js, etc.) to precompiled functions. Instead of mapping
 // names to functions it might make sense to let the JS2C tool
 // generate an index for each native JS file.
 class SourceCodeCache final BASE_EMBEDDED {

src/frames.h

@@ -1534,7 +1534,6 @@ class JavaScriptFrameIterator BASE_EMBEDDED {
 
 // NOTE: The stack trace frame iterator is an iterator that only traverse proper
 // JavaScript frames that have proper JavaScript functions and WASM frames.
-// This excludes the problematic functions in runtime.js.
 class StackTraceFrameIterator BASE_EMBEDDED {
  public:
   explicit StackTraceFrameIterator(Isolate* isolate);

src/js/max-min.js

@@ -0,0 +1,28 @@
+// Copyright 2006-2008 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.
+
+(function(global, utils) {
+
+%CheckIsBootstrapping();
+
+function MaxSimple(a, b) {
+  return a > b ? a : b;
+}
+
+function MinSimple(a, b) {
+  return a > b ? b : a;
+}
+
+%SetForceInlineFlag(MaxSimple);
+%SetForceInlineFlag(MinSimple);
+
+// ----------------------------------------------------------------------------
+// Exports
+
+utils.Export(function(to) {
+  to.MaxSimple = MaxSimple;
+  to.MinSimple = MinSimple;
+});
+
+})

src/js/prologue.js

@@ -8,6 +8,13 @@
 
 %CheckIsBootstrapping();
 
+// NOTE: Setting the prototype for Array must take place as early as
+// possible due to code generation for array literals.  When
+// generating code for a array literal a boilerplate array is created
+// that is cloned when running the code.  It is essential that the
+// boilerplate gets the right prototype.
+%FunctionSetPrototype(global.Array, new global.Array(0));
+
 // -----------------------------------------------------------------------
 // Utils
 

src/js/runtime.js

@@ -1,104 +0,0 @@
-// Copyright 2006-2008 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.
-
-// This files contains runtime support implemented in JavaScript.
-
-// CAUTION: Some of the functions specified in this file are called
-// directly from compiled code. These are the functions with names in
-// ALL CAPS. The compiled code passes the first argument in 'this'.
-
-
-// The following declarations are shared with other native JS files.
-// They are all declared at this one spot to avoid redeclaration errors.
-
-(function(global, utils) {
-
-%CheckIsBootstrapping();
-
-var GlobalArray = global.Array;
-var GlobalBoolean = global.Boolean;
-var GlobalString = global.String;
-var speciesSymbol;
-
-utils.Import(function(from) {
-  speciesSymbol = from.species_symbol;
-});
-
-// ----------------------------------------------------------------------------
-
-
-/* ---------------------------------
-   - - -   U t i l i t i e s   - - -
-   ---------------------------------
-*/
-
-
-function ToPositiveInteger(x, rangeErrorIndex) {
-  var i = TO_INTEGER(x) + 0;
-  if (i < 0) throw %make_range_error(rangeErrorIndex);
-  return i;
-}
-
-
-function ToIndex(x, rangeErrorIndex) {
-  var i = TO_INTEGER(x) + 0;
-  if (i < 0 || i > kMaxSafeInteger) throw %make_range_error(rangeErrorIndex);
-  return i;
-}
-
-
-function MaxSimple(a, b) {
-  return a > b ? a : b;
-}
-
-
-function MinSimple(a, b) {
-  return a > b ? b : a;
-}
-
-
-%SetForceInlineFlag(MaxSimple);
-%SetForceInlineFlag(MinSimple);
-
-
-// ES2015 7.3.20
-function SpeciesConstructor(object, defaultConstructor) {
-  var constructor = object.constructor;
-  if (IS_UNDEFINED(constructor)) {
-    return defaultConstructor;
-  }
-  if (!IS_RECEIVER(constructor)) {
-    throw %make_type_error(kConstructorNotReceiver);
-  }
-  var species = constructor[speciesSymbol];
-  if (IS_NULL_OR_UNDEFINED(species)) {
-    return defaultConstructor;
-  }
-  if (%IsConstructor(species)) {
-    return species;
-  }
-  throw %make_type_error(kSpeciesNotConstructor);
-}
-
-//----------------------------------------------------------------------------
-
-// NOTE: Setting the prototype for Array must take place as early as
-// possible due to code generation for array literals.  When
-// generating code for a array literal a boilerplate array is created
-// that is cloned when running the code.  It is essential that the
-// boilerplate gets the right prototype.
-%FunctionSetPrototype(GlobalArray, new GlobalArray(0));
-
-// ----------------------------------------------------------------------------
-// Exports
-
-utils.Export(function(to) {
-  to.MaxSimple = MaxSimple;
-  to.MinSimple = MinSimple;
-  to.ToPositiveInteger = ToPositiveInteger;
-  to.ToIndex = ToIndex;
-  to.SpeciesConstructor = SpeciesConstructor;
-});
-
-})

src/js/typedarray.js

@@ -29,10 +29,8 @@ var InnerArrayToLocaleString;
 var InternalArray = utils.InternalArray;
 var MaxSimple;
 var MinSimple;
-var SpeciesConstructor;
-var ToPositiveInteger;
-var ToIndex;
 var iteratorSymbol = utils.ImportNow("iterator_symbol");
+var speciesSymbol = utils.ImportNow("species_symbol");
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 macro TYPED_ARRAYS(FUNCTION)
@@ -67,11 +65,27 @@ utils.Import(function(from) {
   InnerArrayToLocaleString = from.InnerArrayToLocaleString;
   MaxSimple = from.MaxSimple;
   MinSimple = from.MinSimple;
-  SpeciesConstructor = from.SpeciesConstructor;
-  ToPositiveInteger = from.ToPositiveInteger;
-  ToIndex = from.ToIndex;
 });
 
+// ES2015 7.3.20
+function SpeciesConstructor(object, defaultConstructor) {
+  var constructor = object.constructor;
+  if (IS_UNDEFINED(constructor)) {
+    return defaultConstructor;
+  }
+  if (!IS_RECEIVER(constructor)) {
+    throw %make_type_error(kConstructorNotReceiver);
+  }
+  var species = constructor[speciesSymbol];
+  if (IS_NULL_OR_UNDEFINED(species)) {
+    return defaultConstructor;
+  }
+  if (%IsConstructor(species)) {
+    return species;
+  }
+  throw %make_type_error(kSpeciesNotConstructor);
+}
+
 // --------------- Typed Arrays ---------------------
 
 function TypedArrayDefaultConstructor(typedArray) {

src/v8.gyp

@@ -2298,7 +2298,7 @@
           'js/macros.py',
           'messages.h',
           'js/prologue.js',
-          'js/runtime.js',
+          'js/max-min.js',
           'js/v8natives.js',
           'js/array.js',
           'js/string.js',