Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 89 insertions, 0 deletions

diff --git a/js/src/vm/StaticStrings.cpp b/js/src/vm/StaticStrings.cpp
new file mode 100644
index 0000000000..c88e02fa39
--- /dev/null
+++ b/js/src/vm/StaticStrings.cpp
@@ -0,0 +1,89 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "vm/StaticStrings.h"
+
+#include "mozilla/HashFunctions.h"  // mozilla::HashString
+
+#include <stddef.h>  // size_t
+#include <stdint.h>  // uint32_t
+
+#include "js/HashTable.h"   // js::HashNumber
+#include "js/TypeDecls.h"   // Latin1Char
+#include "vm/Realm.h"       // AutoAllocInAtomsZone
+#include "vm/StringType.h"  // JSString, JSLinearString
+
+#include "vm/Realm-inl.h"       // AutoAllocInAtomsZone
+#include "vm/StringType-inl.h"  // NewInlineAtom
+
+using namespace js;
+
+constexpr StaticStrings::SmallCharTable StaticStrings::createSmallCharTable() {
+  SmallCharTable array{};
+  for (size_t i = 0; i < SMALL_CHAR_TABLE_SIZE; i++) {
+    array[i] = toSmallChar(i);
+  }
+  return array;
+}
+
+const StaticStrings::SmallCharTable StaticStrings::toSmallCharTable =
+    createSmallCharTable();
+
+bool StaticStrings::init(JSContext* cx) {
+  AutoAllocInAtomsZone az(cx);
+
+  static_assert(UNIT_STATIC_LIMIT - 1 <= JSString::MAX_LATIN1_CHAR,
+                "Unit strings must fit in Latin1Char.");
+
+  for (uint32_t i = 0; i < UNIT_STATIC_LIMIT; i++) {
+    Latin1Char ch = Latin1Char(i);
+    HashNumber hash = mozilla::HashString(&ch, 1);
+    JSAtom* a = NewInlineAtom(cx, &ch, 1, hash);
+    if (!a) {
+      return false;
+    }
+    a->makePermanent();
+    unitStaticTable[i] = a;
+  }
+
+  for (uint32_t i = 0; i < NUM_LENGTH2_ENTRIES; i++) {
+    Latin1Char buffer[] = {firstCharOfLength2(i), secondCharOfLength2(i)};
+    HashNumber hash = mozilla::HashString(buffer, 2);
+    JSAtom* a = NewInlineAtom(cx, buffer, 2, hash);
+    if (!a) {
+      return false;
+    }
+    a->makePermanent();
+    length2StaticTable[i] = a;
+  }
+
+  for (uint32_t i = 0; i < INT_STATIC_LIMIT; i++) {
+    if (i < 10) {
+      intStaticTable[i] = unitStaticTable[i + '0'];
+    } else if (i < 100) {
+      auto index =
+          getLength2IndexStatic(char(i / 10) + '0', char(i % 10) + '0');
+      intStaticTable[i] = length2StaticTable[index];
+    } else {
+      Latin1Char buffer[] = {Latin1Char(firstCharOfLength3(i)),
+                             Latin1Char(secondCharOfLength3(i)),
+                             Latin1Char(thirdCharOfLength3(i))};
+      HashNumber hash = mozilla::HashString(buffer, 3);
+      JSAtom* a = NewInlineAtom(cx, buffer, 3, hash);
+      if (!a) {
+        return false;
+      }
+      a->makePermanent();
+      intStaticTable[i] = a;
+    }
+
+    // Static string initialization can not race, so allow even without the
+    // lock.
+    intStaticTable[i]->setIsIndex(i);
+  }
+
+  return true;
+}