Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 304 insertions, 0 deletions

diff --git a/js/public/Modules.h b/js/public/Modules.h
new file mode 100644
index 0000000000..096e017b73
--- /dev/null
+++ b/js/public/Modules.h
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+/* -*- 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/. */
+
+/* JavaScript module (as in, the syntactic construct) operations. */
+
+#ifndef js_Modules_h
+#define js_Modules_h
+
+#include <stdint.h>  // uint32_t
+
+#include "jstypes.h"  // JS_PUBLIC_API
+
+#include "js/AllocPolicy.h"     // js::SystemAllocPolicy
+#include "js/CompileOptions.h"  // JS::ReadOnlyCompileOptions
+#include "js/RootingAPI.h"      // JS::{Mutable,}Handle
+#include "js/Value.h"           // JS::Value
+#include "js/Vector.h"          // js::Vector
+
+struct JS_PUBLIC_API JSContext;
+class JS_PUBLIC_API JSObject;
+struct JS_PUBLIC_API JSRuntime;
+class JS_PUBLIC_API JSString;
+
+namespace JS {
+template <typename UnitT>
+class SourceText;
+}  // namespace JS
+
+namespace mozilla {
+union Utf8Unit;
+}
+
+namespace JS {
+
+enum class ImportAssertion { Type };
+
+using ImportAssertionVector =
+    js::Vector<ImportAssertion, 1, js::SystemAllocPolicy>;
+
+/**
+ * Set the supported assertions for the runtime to the given vector.
+ *
+ * See:
+ * https://tc39.es/proposal-import-assertions/#sec-hostgetsupportedimportassertions
+ */
+extern JS_PUBLIC_API void SetSupportedImportAssertions(
+    JSRuntime* rt, const ImportAssertionVector& assertions);
+
+/**
+ * The HostResolveImportedModule hook.
+ *
+ * See: https://tc39.es/ecma262/#sec-hostresolveimportedmodule
+ *
+ * This embedding-defined hook is used to implement module loading. It is called
+ * to get or create a module object corresponding to |moduleRequest| occurring
+ * in the context of the script or module with private value
+ * |referencingPrivate|.
+ *
+ * The module specifier string for the request can be obtained by calling
+ * JS::GetModuleRequestSpecifier.
+ *
+ * The private value for a script or module is set with JS::SetScriptPrivate or
+ * JS::SetModulePrivate. It's assumed that the embedding can handle receiving
+ * either here.
+ *
+ * This hook must obey the restrictions defined in the spec:
+ *  - Each time the hook is called with the same arguemnts, the same module must
+ *    be returned.
+ *  - If a module cannot be created for the given arguments, an exception must
+ *    be thrown.
+ *
+ * This is a synchronous operation.
+ */
+using ModuleResolveHook = JSObject* (*)(JSContext* cx,
+                                        Handle<Value> referencingPrivate,
+                                        Handle<JSObject*> moduleRequest);
+
+/**
+ * Get the HostResolveImportedModule hook for the runtime.
+ */
+extern JS_PUBLIC_API ModuleResolveHook GetModuleResolveHook(JSRuntime* rt);
+
+/**
+ * Set the HostResolveImportedModule hook for the runtime to the given function.
+ */
+extern JS_PUBLIC_API void SetModuleResolveHook(JSRuntime* rt,
+                                               ModuleResolveHook func);
+
+/**
+ * The module metadata hook.
+ *
+ * See: https://tc39.es/ecma262/#sec-hostgetimportmetaproperties
+ *
+ * Populate the |metaObject| object returned when import.meta is evaluated in
+ * the context of the script or module with private value |privateValue|.
+ *
+ * This is based on the spec's HostGetImportMetaProperties hook but defines
+ * properties on the meta object directly rather than returning a list.
+ */
+using ModuleMetadataHook = bool (*)(JSContext* cx, Handle<Value> privateValue,
+                                    Handle<JSObject*> metaObject);
+
+/**
+ * Get the hook for populating the import.meta metadata object.
+ */
+extern JS_PUBLIC_API ModuleMetadataHook GetModuleMetadataHook(JSRuntime* rt);
+
+/**
+ * Set the hook for populating the import.meta metadata object to the given
+ * function.
+ */
+extern JS_PUBLIC_API void SetModuleMetadataHook(JSRuntime* rt,
+                                                ModuleMetadataHook func);
+
+/**
+ * The HostImportModuleDynamically hook.
+ *
+ * See https://tc39.es/ecma262/#sec-hostimportmoduledynamically
+ *
+ * Used to implement dynamic module import. Called when evaluating import()
+ * expressions.
+ *
+ * This starts an asynchronous operation. Some time after this hook is called
+ * the embedding must call JS::FinishDynamicModuleImport() passing the
+ * |referencingPrivate|, |moduleRequest| and |promise| arguments from the
+ * call. This must happen for both success and failure cases.
+ *
+ * In the meantime the embedding can take whatever steps it needs to make the
+ * module available. If successful, after calling FinishDynamicModuleImport()
+ * the module should be returned by the resolve hook when passed
+ * |referencingPrivate| and |moduleRequest|.
+ */
+using ModuleDynamicImportHook = bool (*)(JSContext* cx,
+                                         Handle<Value> referencingPrivate,
+                                         Handle<JSObject*> moduleRequest,
+                                         Handle<JSObject*> promise);
+
+/**
+ * Get the HostImportModuleDynamically hook for the runtime.
+ */
+extern JS_PUBLIC_API ModuleDynamicImportHook
+GetModuleDynamicImportHook(JSRuntime* rt);
+
+/**
+ * Set the HostImportModuleDynamically hook for the runtime to the given
+ * function.
+ *
+ * If this hook is not set (or set to nullptr) then the JS engine will throw an
+ * exception if dynamic module import is attempted.
+ */
+extern JS_PUBLIC_API void SetModuleDynamicImportHook(
+    JSRuntime* rt, ModuleDynamicImportHook func);
+
+/**
+ * This must be called after a dynamic import operation is complete.
+ *
+ * If |evaluationPromise| is rejected, the rejection reason will be used to
+ * complete the user's promise.
+ */
+extern JS_PUBLIC_API bool FinishDynamicModuleImport(
+    JSContext* cx, Handle<JSObject*> evaluationPromise,
+    Handle<Value> referencingPrivate, Handle<JSObject*> moduleRequest,
+    Handle<JSObject*> promise);
+
+/**
+ * Parse the given source buffer as a module in the scope of the current global
+ * of cx and return a source text module record.
+ */
+extern JS_PUBLIC_API JSObject* CompileModule(
+    JSContext* cx, const ReadOnlyCompileOptions& options,
+    SourceText<char16_t>& srcBuf);
+
+/**
+ * Parse the given source buffer as a module in the scope of the current global
+ * of cx and return a source text module record.  An error is reported if a
+ * UTF-8 encoding error is encountered.
+ */
+extern JS_PUBLIC_API JSObject* CompileModule(
+    JSContext* cx, const ReadOnlyCompileOptions& options,
+    SourceText<mozilla::Utf8Unit>& srcBuf);
+
+/**
+ * Set a private value associated with a source text module record.
+ */
+extern JS_PUBLIC_API void SetModulePrivate(JSObject* module,
+                                           const Value& value);
+/**
+ * Clear the private value associated with a source text module record.
+ *
+ * This is used during unlinking and can be called on a gray module, skipping
+ * the usual checks.
+ */
+extern JS_PUBLIC_API void ClearModulePrivate(JSObject* module);
+
+/**
+ * Get the private value associated with a source text module record.
+ */
+extern JS_PUBLIC_API Value GetModulePrivate(JSObject* module);
+
+/*
+ * Perform the ModuleLink operation on the given source text module record.
+ *
+ * This transitively resolves all module dependencies (calling the
+ * HostResolveImportedModule hook) and initializes the environment record for
+ * the module.
+ */
+extern JS_PUBLIC_API bool ModuleLink(JSContext* cx,
+                                     Handle<JSObject*> moduleRecord);
+
+/*
+ * Perform the ModuleEvaluate operation on the given source text module record
+ * and returns a bool. A result value is returned in result and is either
+ * undefined (and ignored) or a promise (if Top Level Await is enabled).
+ *
+ * If this module has already been evaluated, it returns the evaluation
+ * promise. Otherwise, it transitively evaluates all dependences of this module
+ * and then evaluates this module.
+ *
+ * ModuleLink must have completed prior to calling this.
+ */
+extern JS_PUBLIC_API bool ModuleEvaluate(JSContext* cx,
+                                         Handle<JSObject*> moduleRecord,
+                                         MutableHandleValue rval);
+
+enum ModuleErrorBehaviour {
+  // Report module evaluation errors asynchronously when the evaluation promise
+  // is rejected. This is used for web content.
+  ReportModuleErrorsAsync,
+
+  // Throw module evaluation errors synchronously by setting an exception on the
+  // context. Does not support modules that use top-level await.
+  ThrowModuleErrorsSync
+};
+
+/*
+ * If a module evaluation fails, unwrap the resulting evaluation promise
+ * and rethrow.
+ *
+ * This does nothing if this module succeeds in evaluation. Otherwise, it
+ * takes the reason for the module throwing, unwraps it and throws it as a
+ * regular error rather than as an uncaught promise.
+ *
+ * ModuleEvaluate must have completed prior to calling this.
+ */
+extern JS_PUBLIC_API bool ThrowOnModuleEvaluationFailure(
+    JSContext* cx, Handle<JSObject*> evaluationPromise,
+    ModuleErrorBehaviour errorBehaviour = ReportModuleErrorsAsync);
+
+/*
+ * Functions to access the module specifiers of a source text module record used
+ * to request module imports.
+ *
+ * Clients can use GetRequestedModulesCount() to get the number of specifiers
+ * and GetRequestedModuleSpecifier() / GetRequestedModuleSourcePos() to get the
+ * individual elements.
+ */
+extern JS_PUBLIC_API uint32_t
+GetRequestedModulesCount(JSContext* cx, Handle<JSObject*> moduleRecord);
+
+extern JS_PUBLIC_API JSString* GetRequestedModuleSpecifier(
+    JSContext* cx, Handle<JSObject*> moduleRecord, uint32_t index);
+
+extern JS_PUBLIC_API void GetRequestedModuleSourcePos(
+    JSContext* cx, Handle<JSObject*> moduleRecord, uint32_t index,
+    uint32_t* lineNumber, uint32_t* columnNumber);
+
+/*
+ * Get the top-level script for a module which has not yet been executed.
+ */
+extern JS_PUBLIC_API JSScript* GetModuleScript(Handle<JSObject*> moduleRecord);
+
+extern JS_PUBLIC_API JSObject* CreateModuleRequest(
+    JSContext* cx, Handle<JSString*> specifierArg);
+extern JS_PUBLIC_API JSString* GetModuleRequestSpecifier(
+    JSContext* cx, Handle<JSObject*> moduleRequestArg);
+
+/*
+ * Get the module record for a module script.
+ */
+extern JS_PUBLIC_API JSObject* GetModuleObject(Handle<JSScript*> moduleScript);
+
+/*
+ * Get the namespace object for a module.
+ */
+extern JS_PUBLIC_API JSObject* GetModuleNamespace(
+    JSContext* cx, Handle<JSObject*> moduleRecord);
+
+extern JS_PUBLIC_API JSObject* GetModuleForNamespace(
+    JSContext* cx, Handle<JSObject*> moduleNamespace);
+
+extern JS_PUBLIC_API JSObject* GetModuleEnvironment(
+    JSContext* cx, Handle<JSObject*> moduleObj);
+
+/*
+ * Clear all bindings in a module's environment. Used during shutdown.
+ */
+extern JS_PUBLIC_API void ClearModuleEnvironment(JSObject* moduleObj);
+
+}  // namespace JS
+
+#endif  // js_Modules_h