Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 167 insertions, 0 deletions

diff --git a/js/src/vm/ErrorObject.h b/js/src/vm/ErrorObject.h
new file mode 100644
index 0000000000..d0424fe429
--- /dev/null
+++ b/js/src/vm/ErrorObject.h
@@ -0,0 +1,167 @@
+/* -*- 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_ErrorObject_h_
+#define vm_ErrorObject_h_
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Maybe.h"
+
+#include <iterator>
+#include <stdint.h>
+
+#include "jspubtd.h"
+#include "NamespaceImports.h"
+
+#include "js/Class.h"
+#include "js/ErrorReport.h"
+#include "js/RootingAPI.h"
+#include "js/TypeDecls.h"
+#include "js/UniquePtr.h"
+#include "js/Value.h"
+#include "vm/JSObject.h"
+#include "vm/NativeObject.h"
+
+namespace js {
+
+class ErrorObject : public NativeObject {
+  static JSObject* createProto(JSContext* cx, JSProtoKey key);
+
+  static JSObject* createConstructor(JSContext* cx, JSProtoKey key);
+
+  static bool init(JSContext* cx, Handle<ErrorObject*> obj, JSExnType type,
+                   UniquePtr<JSErrorReport> errorReport, HandleString fileName,
+                   HandleObject stack, uint32_t sourceId, uint32_t lineNumber,
+                   uint32_t columnNumber, HandleString message,
+                   Handle<mozilla::Maybe<JS::Value>> cause);
+
+  static const ClassSpec classSpecs[JSEXN_ERROR_LIMIT];
+  static const JSClass protoClasses[JSEXN_ERROR_LIMIT];
+
+ protected:
+  static const uint32_t STACK_SLOT = 0;
+  static const uint32_t ERROR_REPORT_SLOT = STACK_SLOT + 1;
+  static const uint32_t FILENAME_SLOT = ERROR_REPORT_SLOT + 1;
+  static const uint32_t LINENUMBER_SLOT = FILENAME_SLOT + 1;
+  static const uint32_t COLUMNNUMBER_SLOT = LINENUMBER_SLOT + 1;
+  static const uint32_t MESSAGE_SLOT = COLUMNNUMBER_SLOT + 1;
+  static const uint32_t CAUSE_SLOT = MESSAGE_SLOT + 1;
+  static const uint32_t SOURCEID_SLOT = CAUSE_SLOT + 1;
+
+  static const uint32_t RESERVED_SLOTS = SOURCEID_SLOT + 1;
+
+  // This slot is only used for errors that could be Wasm traps.
+  static const uint32_t WASM_TRAP_SLOT = SOURCEID_SLOT + 1;
+  static const uint32_t RESERVED_SLOTS_MAYBE_WASM_TRAP = WASM_TRAP_SLOT + 1;
+
+ public:
+  static const JSClass classes[JSEXN_ERROR_LIMIT];
+
+  static const JSClass* classForType(JSExnType type) {
+    MOZ_ASSERT(type < JSEXN_ERROR_LIMIT);
+    return &classes[type];
+  }
+
+  static bool isErrorClass(const JSClass* clasp) {
+    return &classes[0] <= clasp && clasp < &classes[0] + std::size(classes);
+  }
+
+  // Create an error of the given type corresponding to the provided location
+  // info.  If |message| is non-null, then the error will have a .message
+  // property with that value; otherwise the error will have no .message
+  // property.
+  static ErrorObject* create(JSContext* cx, JSExnType type, HandleObject stack,
+                             HandleString fileName, uint32_t sourceId,
+                             uint32_t lineNumber, uint32_t columnNumber,
+                             UniquePtr<JSErrorReport> report,
+                             HandleString message,
+                             Handle<mozilla::Maybe<JS::Value>> cause,
+                             HandleObject proto = nullptr);
+
+  /*
+   * Assign the initial error shape to the empty object.  (This shape does
+   * *not* include .message, which must be added separately if needed; see
+   * ErrorObject::init.)
+   */
+  static SharedShape* assignInitialShape(JSContext* cx,
+                                         Handle<ErrorObject*> obj);
+
+  JSExnType type() const {
+    MOZ_ASSERT(isErrorClass(getClass()));
+    return static_cast<JSExnType>(getClass() - &classes[0]);
+  }
+
+  JSErrorReport* getErrorReport() const {
+    const Value& slot = getReservedSlot(ERROR_REPORT_SLOT);
+    if (slot.isUndefined()) {
+      return nullptr;
+    }
+    return static_cast<JSErrorReport*>(slot.toPrivate());
+  }
+
+  JSErrorReport* getOrCreateErrorReport(JSContext* cx);
+
+  inline JSString* fileName(JSContext* cx) const;
+  inline uint32_t sourceId() const;
+  inline uint32_t lineNumber() const;
+  inline uint32_t columnNumber() const;
+  inline JSObject* stack() const;
+
+  JSString* getMessage() const {
+    Value val = getReservedSlot(MESSAGE_SLOT);
+    return val.isString() ? val.toString() : nullptr;
+  }
+
+  mozilla::Maybe<Value> getCause() const {
+    const auto& value = getReservedSlot(CAUSE_SLOT);
+    if (value.isMagic(JS_ERROR_WITHOUT_CAUSE)) {
+      return mozilla::Nothing();
+    }
+    return mozilla::Some(value);
+  }
+
+  void setStackSlot(const Value& stack) {
+    MOZ_ASSERT(stack.isObjectOrNull());
+    setReservedSlot(STACK_SLOT, stack);
+  }
+
+  void setCauseSlot(const Value& cause) {
+    MOZ_ASSERT(!cause.isMagic());
+    MOZ_ASSERT(getCause().isSome());
+    setReservedSlot(CAUSE_SLOT, cause);
+  }
+
+  // Getter and setter for the Error.prototype.stack accessor.
+  static bool getStack(JSContext* cx, unsigned argc, Value* vp);
+  static bool getStack_impl(JSContext* cx, const CallArgs& args);
+  static bool setStack(JSContext* cx, unsigned argc, Value* vp);
+  static bool setStack_impl(JSContext* cx, const CallArgs& args);
+
+  // Used to distinguish errors created from Wasm traps.
+  bool mightBeWasmTrap() const {
+    return type() == JSEXN_WASMRUNTIMEERROR || type() == JSEXN_INTERNALERR;
+  }
+  bool fromWasmTrap() const {
+    if (!mightBeWasmTrap()) {
+      return false;
+    } else {
+      MOZ_ASSERT(JSCLASS_RESERVED_SLOTS(getClass()) > WASM_TRAP_SLOT);
+      return getReservedSlot(WASM_TRAP_SLOT).toBoolean();
+    }
+  }
+  void setFromWasmTrap();
+};
+
+JSString* ErrorToSource(JSContext* cx, HandleObject obj);
+
+}  // namespace js
+
+template <>
+inline bool JSObject::is<js::ErrorObject>() const {
+  return js::ErrorObject::isErrorClass(getClass());
+}
+
+#endif  // vm_ErrorObject_h_