зеркало из https://github.com/mozilla/gecko-dev.git
249 строки
11 KiB
C++
249 строки
11 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* Functions for compiling and evaluating scripts. */
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#ifndef js_CompilationAndEvaluation_h
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#define js_CompilationAndEvaluation_h
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#include "mozilla/Utf8.h" // mozilla::Utf8Unit
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#include <stddef.h> // size_t
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#include <stdio.h> // FILE
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#include "jsapi.h" // JSGetElementCallback
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#include "jstypes.h" // JS_PUBLIC_API
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#include "js/CompileOptions.h" // JS::CompileOptions, JS::ReadOnlyCompileOptions
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#include "js/RootingAPI.h" // JS::Handle, JS::MutableHandle
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#include "js/Value.h" // JS::Value and specializations of JS::*Handle-related types
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struct JS_PUBLIC_API JSContext;
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class JS_PUBLIC_API JSFunction;
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class JS_PUBLIC_API JSObject;
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class JS_PUBLIC_API JSScript;
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namespace JS {
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template <typename UnitT>
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class SourceText;
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} // namespace JS
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/**
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* Given a buffer, return false if the buffer might become a valid JavaScript
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* script with the addition of more lines, or true if the validity of such a
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* script is conclusively known (because it's the prefix of a valid script --
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* and possibly the entirety of such a script).
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*
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* The intent of this function is to enable interactive compilation: accumulate
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* lines in a buffer until JS_Utf8BufferIsCompilableUnit is true, then pass it
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* to the compiler.
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*
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* The provided buffer is interpreted as UTF-8 data. An error is reported if
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* a UTF-8 encoding error is encountered.
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*/
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extern JS_PUBLIC_API bool JS_Utf8BufferIsCompilableUnit(
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JSContext* cx, JS::Handle<JSObject*> obj, const char* utf8, size_t length);
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/*
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* NB: JS_ExecuteScript and the JS::Evaluate APIs come in two flavors: either
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* they use the global as the scope, or they take a HandleValueVector of
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* objects to use as the scope chain. In the former case, the global is also
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* used as the "this" keyword value and the variables object (ECMA parlance for
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* where 'var' and 'function' bind names) of the execution context for script.
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* In the latter case, the first object in the provided list is used, unless the
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* list is empty, in which case the global is used.
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*
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* Why a runtime option? The alternative is to add APIs duplicating those
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* for the other value of flags, and that doesn't seem worth the code bloat
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* cost. Such new entry points would probably have less obvious names, too, so
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* would not tend to be used. The ContextOptionsRef adjustment, OTOH, can be
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* more easily hacked into existing code that does not depend on the bug; such
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* code can continue to use the familiar JS::Evaluate, etc., entry points.
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*/
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/**
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* Evaluate a script in the scope of the current global of cx.
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*/
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extern JS_PUBLIC_API bool JS_ExecuteScript(JSContext* cx,
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JS::Handle<JSScript*> script,
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JS::MutableHandle<JS::Value> rval);
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extern JS_PUBLIC_API bool JS_ExecuteScript(JSContext* cx,
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JS::Handle<JSScript*> script);
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/**
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* As above, but providing an explicit scope chain. envChain must not include
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* the global object on it; that's implicit. It needs to contain the other
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* objects that should end up on the script's scope chain.
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*/
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extern JS_PUBLIC_API bool JS_ExecuteScript(JSContext* cx,
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JS::HandleObjectVector envChain,
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JS::Handle<JSScript*> script,
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JS::MutableHandle<JS::Value> rval);
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extern JS_PUBLIC_API bool JS_ExecuteScript(JSContext* cx,
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JS::HandleObjectVector envChain,
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JS::Handle<JSScript*> script);
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namespace JS {
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/**
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* Like the above, but handles a cross-compartment script. If the script is
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* cross-compartment, it is cloned into the current compartment before
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* executing.
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*/
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extern JS_PUBLIC_API bool CloneAndExecuteScript(JSContext* cx,
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Handle<JSScript*> script,
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MutableHandle<Value> rval);
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/**
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* Like CloneAndExecuteScript above, but allows executing under a non-syntactic
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* environment chain.
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*/
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extern JS_PUBLIC_API bool CloneAndExecuteScript(JSContext* cx,
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HandleObjectVector envChain,
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Handle<JSScript*> script,
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MutableHandle<Value> rval);
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/**
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* Evaluate the given source buffer in the scope of the current global of cx,
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* and return the completion value in |rval|.
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*/
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extern JS_PUBLIC_API bool Evaluate(JSContext* cx,
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const ReadOnlyCompileOptions& options,
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SourceText<char16_t>& srcBuf,
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MutableHandle<Value> rval);
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/**
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* As above, but providing an explicit scope chain. envChain must not include
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* the global object on it; that's implicit. It needs to contain the other
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* objects that should end up on the script's scope chain.
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*/
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extern JS_PUBLIC_API bool Evaluate(JSContext* cx, HandleObjectVector envChain,
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const ReadOnlyCompileOptions& options,
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SourceText<char16_t>& srcBuf,
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MutableHandle<Value> rval);
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/**
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* Evaluate the provided UTF-8 data in the scope of the current global of |cx|,
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* and return the completion value in |rval|. If the data contains invalid
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* UTF-8, an error is reported.
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*/
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extern JS_PUBLIC_API bool Evaluate(JSContext* cx,
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const ReadOnlyCompileOptions& options,
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SourceText<mozilla::Utf8Unit>& srcBuf,
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MutableHandle<Value> rval);
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/**
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* Evaluate the UTF-8 contents of the file at the given path, and return the
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* completion value in |rval|. (The path itself is in the system encoding, not
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* [necessarily] UTF-8.) If the contents contain any malformed UTF-8, an error
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* is reported.
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*/
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extern JS_PUBLIC_API bool EvaluateUtf8Path(
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JSContext* cx, const ReadOnlyCompileOptions& options, const char* filename,
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MutableHandle<Value> rval);
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/**
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* Compile the provided script using the given options. Return the script on
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* success, or return null on failure (usually with an error reported).
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*/
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extern JS_PUBLIC_API JSScript* Compile(JSContext* cx,
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const ReadOnlyCompileOptions& options,
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SourceText<char16_t>& srcBuf);
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/**
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* Compile the provided script using the given options. Return the script on
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* success, or return null on failure (usually with an error reported).
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*/
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extern JS_PUBLIC_API JSScript* Compile(JSContext* cx,
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const ReadOnlyCompileOptions& options,
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SourceText<mozilla::Utf8Unit>& srcBuf);
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/**
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* Compile the provided script using the given options, and register an encoder
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* on is script source, such that all functions can be encoded as they are
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* parsed. This strategy is used to avoid blocking the main thread in a
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* non-interruptible way.
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*
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* See also JS::FinishIncrementalEncoding.
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*
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* Return the script on success, or return null on failure (usually with an
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* error reported)
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*/
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extern JS_PUBLIC_API JSScript* CompileAndStartIncrementalEncoding(
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JSContext* cx, const ReadOnlyCompileOptions& options,
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SourceText<char16_t>& srcBuf);
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extern JS_PUBLIC_API JSScript* CompileAndStartIncrementalEncoding(
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JSContext* cx, const ReadOnlyCompileOptions& options,
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SourceText<mozilla::Utf8Unit>& srcBuf);
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/**
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* Compile the UTF-8 contents of the given file into a script. It is an error
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* if the file contains invalid UTF-8. Return the script on success, or return
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* null on failure (usually with an error reported).
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*/
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extern JS_PUBLIC_API JSScript* CompileUtf8File(
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JSContext* cx, const ReadOnlyCompileOptions& options, FILE* file);
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/**
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* Compile the UTF-8 contents of the file at the given path into a script.
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* (The path itself is in the system encoding, not [necessarily] UTF-8.) It
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* is an error if the file's contents are invalid UTF-8. Return the script on
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* success, or return null on failure (usually with an error reported).
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*/
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extern JS_PUBLIC_API JSScript* CompileUtf8Path(
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JSContext* cx, const ReadOnlyCompileOptions& options, const char* filename);
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/**
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* Compile a function with envChain plus the global as its scope chain.
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* envChain must contain objects in the current compartment of cx. The actual
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* scope chain used for the function will consist of With wrappers for those
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* objects, followed by the current global of the compartment cx is in. This
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* global must not be explicitly included in the scope chain.
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*/
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extern JS_PUBLIC_API JSFunction* CompileFunction(
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JSContext* cx, HandleObjectVector envChain,
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const ReadOnlyCompileOptions& options, const char* name, unsigned nargs,
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const char* const* argnames, SourceText<char16_t>& srcBuf);
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/**
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* Compile a function with envChain plus the global as its scope chain.
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* envChain must contain objects in the current compartment of cx. The actual
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* scope chain used for the function will consist of With wrappers for those
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* objects, followed by the current global of the compartment cx is in. This
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* global must not be explicitly included in the scope chain.
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*/
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extern JS_PUBLIC_API JSFunction* CompileFunction(
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JSContext* cx, HandleObjectVector envChain,
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const ReadOnlyCompileOptions& options, const char* name, unsigned nargs,
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const char* const* argnames, SourceText<mozilla::Utf8Unit>& srcBuf);
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/**
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* Identical to the CompileFunction overload above for UTF-8, but with
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* Rust-friendly ergonomics.
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*/
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extern JS_PUBLIC_API JSFunction* CompileFunctionUtf8(
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JSContext* cx, HandleObjectVector envChain,
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const ReadOnlyCompileOptions& options, const char* name, unsigned nargs,
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const char* const* argnames, const char* utf8, size_t length);
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/*
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* For a script compiled with the hideScriptFromDebugger option, expose the
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* script to the debugger by calling the debugger's onNewScript hook.
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*/
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extern JS_PUBLIC_API void ExposeScriptToDebugger(JSContext* cx,
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Handle<JSScript*> script);
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extern JS_PUBLIC_API void SetGetElementCallback(JSContext* cx,
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JSGetElementCallback callback);
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} /* namespace JS */
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#endif /* js_CompilationAndEvaluation_h */
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