Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 639 insertions, 0 deletions

diff --git a/js/src/vm/Interpreter-inl.h b/js/src/vm/Interpreter-inl.h
new file mode 100644
index 0000000000..62016a3d65
--- /dev/null
+++ b/js/src/vm/Interpreter-inl.h
@@ -0,0 +1,639 @@
+/* -*- 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/. */
+
+#ifndef vm_Interpreter_inl_h
+#define vm_Interpreter_inl_h
+
+#include "vm/Interpreter.h"
+
+#include "jsnum.h"
+
+#include "js/friend/ErrorMessages.h"  // js::GetErrorMessage, JSMSG_*
+#include "vm/ArgumentsObject.h"
+#include "vm/BigIntType.h"
+#include "vm/BytecodeUtil.h"  // JSDVG_SEARCH_STACK
+#include "vm/Realm.h"
+#include "vm/SharedStencil.h"  // GCThingIndex
+#include "vm/StaticStrings.h"
+#include "vm/ThrowMsgKind.h"
+#ifdef ENABLE_RECORD_TUPLE
+#  include "vm/RecordTupleShared.h"
+#endif
+
+#include "vm/GlobalObject-inl.h"
+#include "vm/JSAtom-inl.h"
+#include "vm/JSContext-inl.h"
+#include "vm/JSObject-inl.h"
+#include "vm/ObjectOperations-inl.h"
+#include "vm/StringType-inl.h"
+
+namespace js {
+
+/*
+ * Per ES6, lexical declarations may not be accessed in any fashion until they
+ * are initialized (i.e., until the actual declaring statement is
+ * executed). The various LEXICAL opcodes need to check if the slot is an
+ * uninitialized let declaration, represented by the magic value
+ * JS_UNINITIALIZED_LEXICAL.
+ */
+static inline bool IsUninitializedLexical(const Value& val) {
+  // Use whyMagic here because JS_OPTIMIZED_OUT could flow into here.
+  return val.isMagic() && val.whyMagic() == JS_UNINITIALIZED_LEXICAL;
+}
+
+static inline bool IsUninitializedLexicalSlot(HandleObject obj,
+                                              const PropertyResult& prop) {
+  MOZ_ASSERT(prop.isFound());
+  if (obj->is<WithEnvironmentObject>()) {
+    return false;
+  }
+
+  // Proxy hooks may return a non-native property.
+  if (prop.isNonNativeProperty()) {
+    return false;
+  }
+
+  PropertyInfo propInfo = prop.propertyInfo();
+  if (!propInfo.isDataProperty()) {
+    return false;
+  }
+
+  return IsUninitializedLexical(
+      obj->as<NativeObject>().getSlot(propInfo.slot()));
+}
+
+static inline bool CheckUninitializedLexical(JSContext* cx, PropertyName* name_,
+                                             HandleValue val) {
+  if (IsUninitializedLexical(val)) {
+    Rooted<PropertyName*> name(cx, name_);
+    ReportRuntimeLexicalError(cx, JSMSG_UNINITIALIZED_LEXICAL, name);
+    return false;
+  }
+  return true;
+}
+
+inline bool GetLengthProperty(const Value& lval, MutableHandleValue vp) {
+  /* Optimize length accesses on strings, arrays, and arguments. */
+  if (lval.isString()) {
+    vp.setInt32(lval.toString()->length());
+    return true;
+  }
+  if (lval.isObject()) {
+    JSObject* obj = &lval.toObject();
+    if (obj->is<ArrayObject>()) {
+      vp.setNumber(obj->as<ArrayObject>().length());
+      return true;
+    }
+
+    if (obj->is<ArgumentsObject>()) {
+      ArgumentsObject* argsobj = &obj->as<ArgumentsObject>();
+      if (!argsobj->hasOverriddenLength()) {
+        uint32_t length = argsobj->initialLength();
+        MOZ_ASSERT(length < INT32_MAX);
+        vp.setInt32(int32_t(length));
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+enum class GetNameMode { Normal, TypeOf };
+
+template <GetNameMode mode>
+inline bool FetchName(JSContext* cx, HandleObject receiver, HandleObject holder,
+                      Handle<PropertyName*> name, const PropertyResult& prop,
+                      MutableHandleValue vp) {
+  if (prop.isNotFound()) {
+    switch (mode) {
+      case GetNameMode::Normal:
+        ReportIsNotDefined(cx, name);
+        return false;
+      case GetNameMode::TypeOf:
+        vp.setUndefined();
+        return true;
+    }
+  }
+
+  /* Take the slow path if shape was not found in a native object. */
+  if (!receiver->is<NativeObject>() || !holder->is<NativeObject>()) {
+    Rooted<jsid> id(cx, NameToId(name));
+    if (!GetProperty(cx, receiver, receiver, id, vp)) {
+      return false;
+    }
+  } else {
+    PropertyInfo propInfo = prop.propertyInfo();
+    if (propInfo.isDataProperty()) {
+      /* Fast path for Object instance properties. */
+      vp.set(holder->as<NativeObject>().getSlot(propInfo.slot()));
+    } else {
+      // Unwrap 'with' environments for reasons given in
+      // GetNameBoundInEnvironment.
+      RootedObject normalized(cx, MaybeUnwrapWithEnvironment(receiver));
+      RootedId id(cx, NameToId(name));
+      if (!NativeGetExistingProperty(cx, normalized, holder.as<NativeObject>(),
+                                     id, propInfo, vp)) {
+        return false;
+      }
+    }
+  }
+
+  // We do our own explicit checking for |this|
+  if (name == cx->names().dotThis) {
+    return true;
+  }
+
+  // NAME operations are the slow paths already, so unconditionally check
+  // for uninitialized lets.
+  return CheckUninitializedLexical(cx, name, vp);
+}
+
+inline bool FetchNameNoGC(NativeObject* pobj, PropertyResult prop, Value* vp) {
+  if (prop.isNotFound()) {
+    return false;
+  }
+
+  PropertyInfo propInfo = prop.propertyInfo();
+  if (!propInfo.isDataProperty()) {
+    return false;
+  }
+
+  *vp = pobj->getSlot(propInfo.slot());
+  return !IsUninitializedLexical(*vp);
+}
+
+template <js::GetNameMode mode>
+inline bool GetEnvironmentName(JSContext* cx, HandleObject envChain,
+                               Handle<PropertyName*> name,
+                               MutableHandleValue vp) {
+  {
+    PropertyResult prop;
+    JSObject* obj = nullptr;
+    NativeObject* pobj = nullptr;
+    if (LookupNameNoGC(cx, name, envChain, &obj, &pobj, &prop)) {
+      if (FetchNameNoGC(pobj, prop, vp.address())) {
+        return true;
+      }
+    }
+  }
+
+  PropertyResult prop;
+  RootedObject obj(cx), pobj(cx);
+  if (!LookupName(cx, name, envChain, &obj, &pobj, &prop)) {
+    return false;
+  }
+
+  return FetchName<mode>(cx, obj, pobj, name, prop, vp);
+}
+
+inline bool HasOwnProperty(JSContext* cx, HandleValue val, HandleValue idValue,
+                           bool* result) {
+  // As an optimization, provide a fast path when rooting is not necessary and
+  // we can safely retrieve the object's shape.
+  jsid id;
+  if (val.isObject() && idValue.isPrimitive() &&
+      PrimitiveValueToId<NoGC>(cx, idValue, &id)) {
+    JSObject* obj = &val.toObject();
+    PropertyResult prop;
+    if (obj->is<NativeObject>() &&
+        NativeLookupOwnProperty<NoGC>(cx, &obj->as<NativeObject>(), id,
+                                      &prop)) {
+      *result = prop.isFound();
+      return true;
+    }
+  }
+
+  // Step 1.
+  RootedId key(cx);
+  if (!ToPropertyKey(cx, idValue, &key)) {
+    return false;
+  }
+
+  // Step 2.
+  RootedObject obj(cx, ToObject(cx, val));
+  if (!obj) {
+    return false;
+  }
+
+  // Step 3.
+  return HasOwnProperty(cx, obj, key, result);
+}
+
+inline bool GetIntrinsicOperation(JSContext* cx, HandleScript script,
+                                  jsbytecode* pc, MutableHandleValue vp) {
+  Rooted<PropertyName*> name(cx, script->getName(pc));
+  return GlobalObject::getIntrinsicValue(cx, cx->global(), name, vp);
+}
+
+inline bool SetIntrinsicOperation(JSContext* cx, JSScript* script,
+                                  jsbytecode* pc, HandleValue val) {
+  Rooted<PropertyName*> name(cx, script->getName(pc));
+  return GlobalObject::setIntrinsicValue(cx, cx->global(), name, val);
+}
+
+inline bool SetNameOperation(JSContext* cx, JSScript* script, jsbytecode* pc,
+                             HandleObject env, HandleValue val) {
+  MOZ_ASSERT(JSOp(*pc) == JSOp::SetName || JSOp(*pc) == JSOp::StrictSetName ||
+             JSOp(*pc) == JSOp::SetGName || JSOp(*pc) == JSOp::StrictSetGName);
+  MOZ_ASSERT_IF(
+      JSOp(*pc) == JSOp::SetGName || JSOp(*pc) == JSOp::StrictSetGName,
+      !script->hasNonSyntacticScope());
+  MOZ_ASSERT_IF(
+      JSOp(*pc) == JSOp::SetGName || JSOp(*pc) == JSOp::StrictSetGName,
+      env == cx->global() || env == &cx->global()->lexicalEnvironment() ||
+          env->is<RuntimeLexicalErrorObject>());
+
+  bool strict =
+      JSOp(*pc) == JSOp::StrictSetName || JSOp(*pc) == JSOp::StrictSetGName;
+  Rooted<PropertyName*> name(cx, script->getName(pc));
+
+  // In strict mode, assigning to an undeclared global variable is an
+  // error. To detect this, we call NativeSetProperty directly and pass
+  // Unqualified. It stores the error, if any, in |result|.
+  bool ok;
+  ObjectOpResult result;
+  RootedId id(cx, NameToId(name));
+  RootedValue receiver(cx, ObjectValue(*env));
+  if (env->isUnqualifiedVarObj()) {
+    Rooted<NativeObject*> varobj(cx);
+    if (env->is<DebugEnvironmentProxy>()) {
+      varobj =
+          &env->as<DebugEnvironmentProxy>().environment().as<NativeObject>();
+    } else {
+      varobj = &env->as<NativeObject>();
+    }
+    MOZ_ASSERT(!varobj->getOpsSetProperty());
+    ok = NativeSetProperty<Unqualified>(cx, varobj, id, val, receiver, result);
+  } else {
+    ok = SetProperty(cx, env, id, val, receiver, result);
+  }
+  return ok && result.checkStrictModeError(cx, env, id, strict);
+}
+
+inline void InitGlobalLexicalOperation(
+    JSContext* cx, ExtensibleLexicalEnvironmentObject* lexicalEnv,
+    JSScript* script, jsbytecode* pc, HandleValue value) {
+  MOZ_ASSERT_IF(!script->hasNonSyntacticScope(),
+                lexicalEnv == &cx->global()->lexicalEnvironment());
+  MOZ_ASSERT(JSOp(*pc) == JSOp::InitGLexical);
+
+  mozilla::Maybe<PropertyInfo> prop =
+      lexicalEnv->lookup(cx, script->getName(pc));
+  MOZ_ASSERT(prop.isSome());
+  MOZ_ASSERT(IsUninitializedLexical(lexicalEnv->getSlot(prop->slot())));
+
+  lexicalEnv->setSlot(prop->slot(), value);
+}
+
+inline bool InitPropertyOperation(JSContext* cx, jsbytecode* pc,
+                                  HandleObject obj, Handle<PropertyName*> name,
+                                  HandleValue rhs) {
+  unsigned propAttrs = GetInitDataPropAttrs(JSOp(*pc));
+  return DefineDataProperty(cx, obj, name, rhs, propAttrs);
+}
+
+static MOZ_ALWAYS_INLINE bool NegOperation(JSContext* cx,
+                                           MutableHandleValue val,
+                                           MutableHandleValue res) {
+  /*
+   * When the operand is int jsval, INT32_FITS_IN_JSVAL(i) implies
+   * INT32_FITS_IN_JSVAL(-i) unless i is 0 or INT32_MIN when the
+   * results, -0.0 or INT32_MAX + 1, are double values.
+   */
+  int32_t i;
+  if (val.isInt32() && (i = val.toInt32()) != 0 && i != INT32_MIN) {
+    res.setInt32(-i);
+    return true;
+  }
+
+  if (!ToNumeric(cx, val)) {
+    return false;
+  }
+
+  if (val.isBigInt()) {
+    return BigInt::negValue(cx, val, res);
+  }
+
+  res.setNumber(-val.toNumber());
+  return true;
+}
+
+static MOZ_ALWAYS_INLINE bool IncOperation(JSContext* cx, HandleValue val,
+                                           MutableHandleValue res) {
+  int32_t i;
+  if (val.isInt32() && (i = val.toInt32()) != INT32_MAX) {
+    res.setInt32(i + 1);
+    return true;
+  }
+
+  if (val.isNumber()) {
+    res.setNumber(val.toNumber() + 1);
+    return true;
+  }
+
+  MOZ_ASSERT(val.isBigInt(), "+1 only callable on result of JSOp::ToNumeric");
+  return BigInt::incValue(cx, val, res);
+}
+
+static MOZ_ALWAYS_INLINE bool DecOperation(JSContext* cx, HandleValue val,
+                                           MutableHandleValue res) {
+  int32_t i;
+  if (val.isInt32() && (i = val.toInt32()) != INT32_MIN) {
+    res.setInt32(i - 1);
+    return true;
+  }
+
+  if (val.isNumber()) {
+    res.setNumber(val.toNumber() - 1);
+    return true;
+  }
+
+  MOZ_ASSERT(val.isBigInt(), "-1 only callable on result of JSOp::ToNumeric");
+  return BigInt::decValue(cx, val, res);
+}
+
+static MOZ_ALWAYS_INLINE bool ToPropertyKeyOperation(JSContext* cx,
+                                                     HandleValue idval,
+                                                     MutableHandleValue res) {
+  if (idval.isInt32()) {
+    res.set(idval);
+    return true;
+  }
+
+  RootedId id(cx);
+  if (!ToPropertyKey(cx, idval, &id)) {
+    return false;
+  }
+
+  res.set(IdToValue(id));
+  return true;
+}
+
+static MOZ_ALWAYS_INLINE bool GetObjectElementOperation(
+    JSContext* cx, JSOp op, JS::HandleObject obj, JS::HandleValue receiver,
+    HandleValue key, MutableHandleValue res) {
+  MOZ_ASSERT(op == JSOp::GetElem || op == JSOp::GetElemSuper);
+  MOZ_ASSERT_IF(op == JSOp::GetElem, obj == &receiver.toObject());
+
+  do {
+    uint32_t index;
+    if (IsDefinitelyIndex(key, &index)) {
+      if (GetElementNoGC(cx, obj, receiver, index, res.address())) {
+        break;
+      }
+
+      if (!GetElement(cx, obj, receiver, index, res)) {
+        return false;
+      }
+      break;
+    }
+
+    if (key.isString()) {
+      JSString* str = key.toString();
+      JSAtom* name = str->isAtom() ? &str->asAtom() : AtomizeString(cx, str);
+      if (!name) {
+        return false;
+      }
+      if (name->isIndex(&index)) {
+        if (GetElementNoGC(cx, obj, receiver, index, res.address())) {
+          break;
+        }
+      } else {
+        if (GetPropertyNoGC(cx, obj, receiver, name->asPropertyName(),
+                            res.address())) {
+          break;
+        }
+      }
+    }
+
+    RootedId id(cx);
+    if (!ToPropertyKey(cx, key, &id)) {
+      return false;
+    }
+    if (!GetProperty(cx, obj, receiver, id, res)) {
+      return false;
+    }
+  } while (false);
+
+  cx->debugOnlyCheck(res);
+  return true;
+}
+
+static MOZ_ALWAYS_INLINE bool GetPrimitiveElementOperation(
+    JSContext* cx, JS::HandleValue receiver, int receiverIndex, HandleValue key,
+    MutableHandleValue res) {
+#ifdef ENABLE_RECORD_TUPLE
+  if (receiver.isExtendedPrimitive()) {
+    RootedId id(cx);
+    if (!ToPropertyKey(cx, key, &id)) {
+      return false;
+    }
+    RootedObject obj(cx, &receiver.toExtendedPrimitive());
+    if (!ExtendedPrimitiveGetProperty(cx, obj, receiver, id, res)) {
+      return false;
+    }
+  }
+#endif
+
+  // FIXME: Bug 1234324 We shouldn't be boxing here.
+  RootedObject boxed(
+      cx, ToObjectFromStackForPropertyAccess(cx, receiver, receiverIndex, key));
+  if (!boxed) {
+    return false;
+  }
+
+  do {
+    uint32_t index;
+    if (IsDefinitelyIndex(key, &index)) {
+      if (GetElementNoGC(cx, boxed, receiver, index, res.address())) {
+        break;
+      }
+
+      if (!GetElement(cx, boxed, receiver, index, res)) {
+        return false;
+      }
+      break;
+    }
+
+    if (key.isString()) {
+      JSString* str = key.toString();
+      JSAtom* name = str->isAtom() ? &str->asAtom() : AtomizeString(cx, str);
+      if (!name) {
+        return false;
+      }
+      if (name->isIndex(&index)) {
+        if (GetElementNoGC(cx, boxed, receiver, index, res.address())) {
+          break;
+        }
+      } else {
+        if (GetPropertyNoGC(cx, boxed, receiver, name->asPropertyName(),
+                            res.address())) {
+          break;
+        }
+      }
+    }
+
+    RootedId id(cx);
+    if (!ToPropertyKey(cx, key, &id)) {
+      return false;
+    }
+    if (!GetProperty(cx, boxed, receiver, id, res)) {
+      return false;
+    }
+  } while (false);
+
+  cx->debugOnlyCheck(res);
+  return true;
+}
+
+static MOZ_ALWAYS_INLINE bool GetElementOperationWithStackIndex(
+    JSContext* cx, HandleValue lref, int lrefIndex, HandleValue rref,
+    MutableHandleValue res) {
+  uint32_t index;
+  if (lref.isString() && IsDefinitelyIndex(rref, &index)) {
+    JSString* str = lref.toString();
+    if (index < str->length()) {
+      str = cx->staticStrings().getUnitStringForElement(cx, str, index);
+      if (!str) {
+        return false;
+      }
+      res.setString(str);
+      return true;
+    }
+  }
+
+  if (lref.isPrimitive()) {
+    return GetPrimitiveElementOperation(cx, lref, lrefIndex, rref, res);
+  }
+
+  RootedObject obj(cx, &lref.toObject());
+  return GetObjectElementOperation(cx, JSOp::GetElem, obj, lref, rref, res);
+}
+
+// Wrapper for callVM from JIT.
+static MOZ_ALWAYS_INLINE bool GetElementOperation(JSContext* cx,
+                                                  HandleValue lref,
+                                                  HandleValue rref,
+                                                  MutableHandleValue res) {
+  return GetElementOperationWithStackIndex(cx, lref, JSDVG_SEARCH_STACK, rref,
+                                           res);
+}
+
+static MOZ_ALWAYS_INLINE JSString* TypeOfOperation(const Value& v,
+                                                   JSRuntime* rt) {
+  JSType type = js::TypeOfValue(v);
+  return TypeName(type, *rt->commonNames);
+}
+
+static MOZ_ALWAYS_INLINE bool InitElemOperation(JSContext* cx, jsbytecode* pc,
+                                                HandleObject obj,
+                                                HandleValue idval,
+                                                HandleValue val) {
+  MOZ_ASSERT(!val.isMagic(JS_ELEMENTS_HOLE));
+
+  RootedId id(cx);
+  if (!ToPropertyKey(cx, idval, &id)) {
+    return false;
+  }
+
+  unsigned flags = GetInitDataPropAttrs(JSOp(*pc));
+  if (id.isPrivateName()) {
+    // Clear enumerate flag off of private names.
+    flags &= ~JSPROP_ENUMERATE;
+  }
+  return DefineDataProperty(cx, obj, id, val, flags);
+}
+
+static MOZ_ALWAYS_INLINE bool CheckPrivateFieldOperation(JSContext* cx,
+                                                         jsbytecode* pc,
+                                                         HandleValue val,
+                                                         HandleValue idval,
+                                                         bool* result) {
+  MOZ_ASSERT(idval.isSymbol());
+  MOZ_ASSERT(idval.toSymbol()->isPrivateName());
+
+  // Result had better not be a nullptr.
+  MOZ_ASSERT(result);
+
+  ThrowCondition condition;
+  ThrowMsgKind msgKind;
+  GetCheckPrivateFieldOperands(pc, &condition, &msgKind);
+
+  // When we are using OnlyCheckRhs, we are implementing PrivateInExpr
+  // This requires we throw if the rhs is not an object;
+  //
+  // The InlineCache for CheckPrivateField already checks for a
+  // non-object rhs and refuses to attach in that circumstance.
+  if (condition == ThrowCondition::OnlyCheckRhs) {
+    if (!val.isObject()) {
+      ReportInNotObjectError(cx, idval, val);
+      return false;
+    }
+  }
+
+  // Invoke the HostEnsureCanAddPrivateElement ( O ) host hook here
+  // if the code is attempting to attach a new private element (which
+  // corresponds to the ThrowHas Throw Condition).
+  if (condition == ThrowCondition::ThrowHas) {
+    if (JS::EnsureCanAddPrivateElementOp op =
+            cx->runtime()->canAddPrivateElement) {
+      if (!op(cx, val)) {
+        return false;
+      }
+    }
+  }
+
+  if (!HasOwnProperty(cx, val, idval, result)) {
+    return false;
+  }
+
+  if (!CheckPrivateFieldWillThrow(condition, *result)) {
+    return true;
+  }
+
+  // Throw!
+  JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+                            ThrowMsgKindToErrNum(msgKind));
+  return false;
+}
+
+static inline JS::Symbol* NewPrivateName(JSContext* cx, Handle<JSAtom*> name) {
+  return JS::Symbol::new_(cx, JS::SymbolCode::PrivateNameSymbol, name);
+}
+
+inline bool InitElemIncOperation(JSContext* cx, Handle<ArrayObject*> arr,
+                                 uint32_t index, HandleValue val) {
+  if (index == INT32_MAX) {
+    JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+                              JSMSG_SPREAD_TOO_LARGE);
+    return false;
+  }
+
+  // If val is a hole, do not call DefineDataElement.
+  if (val.isMagic(JS_ELEMENTS_HOLE)) {
+    // Always call SetLengthProperty even if this is not the last element
+    // initialiser, because this may be followed by a SpreadElement loop,
+    // which will not set the array length if nothing is spread.
+    return SetLengthProperty(cx, arr, index + 1);
+  }
+
+  return DefineDataElement(cx, arr, index, val, JSPROP_ENUMERATE);
+}
+
+inline JSFunction* ReportIfNotFunction(
+    JSContext* cx, HandleValue v, MaybeConstruct construct = NO_CONSTRUCT) {
+  if (v.isObject() && v.toObject().is<JSFunction>()) {
+    return &v.toObject().as<JSFunction>();
+  }
+
+  ReportIsNotFunction(cx, v, -1, construct);
+  return nullptr;
+}
+
+} /* namespace js */
+
+#endif /* vm_Interpreter_inl_h */