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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
/* Functions for compiling and evaluating scripts. */
#ifndef js_CompilationAndEvaluation_h
#define js_CompilationAndEvaluation_h
#include <stddef.h> // size_t
#include <stdio.h> // FILE
#include "jsapi.h" // JSGetElementCallback
#include "jstypes.h" // JS_PUBLIC_API
#include "js/CompileOptions.h" // JS::CompileOptions, JS::ReadOnlyCompileOptions
#include "js/RootingAPI.h" // JS::Handle, JS::MutableHandle
#include "js/Value.h" // JS::Value and specializations of JS::*Handle-related types
struct JS_PUBLIC_API JSContext;
class JS_PUBLIC_API JSFunction;
class JS_PUBLIC_API JSObject;
class JS_PUBLIC_API JSScript;
namespace mozilla {
union Utf8Unit;
}
namespace JS {
template <typename UnitT>
class SourceText;
} // namespace JS
/**
* Given a buffer, return false if the buffer might become a valid JavaScript
* script with the addition of more lines, or true if the validity of such a
* script is conclusively known (because it's the prefix of a valid script --
* and possibly the entirety of such a script).
*
* The intent of this function is to enable interactive compilation: accumulate
* lines in a buffer until JS_Utf8BufferIsCompilableUnit is true, then pass it
* to the compiler.
*
* The provided buffer is interpreted as UTF-8 data. An error is reported if
* a UTF-8 encoding error is encountered.
*/
extern JS_PUBLIC_API bool JS_Utf8BufferIsCompilableUnit(
JSContext* cx, JS::Handle<JSObject*> obj, const char* utf8, size_t length);
/*
* NB: JS_ExecuteScript and the JS::Evaluate APIs come in two flavors: either
* they use the global as the scope, or they take a HandleValueVector of
* objects to use as the scope chain. In the former case, the global is also
* used as the "this" keyword value and the variables object (ECMA parlance for
* where 'var' and 'function' bind names) of the execution context for script.
* In the latter case, the first object in the provided list is used, unless the
* list is empty, in which case the global is used.
*
* Why a runtime option? The alternative is to add APIs duplicating those
* for the other value of flags, and that doesn't seem worth the code bloat
* cost. Such new entry points would probably have less obvious names, too, so
* would not tend to be used. The ContextOptionsRef adjustment, OTOH, can be
* more easily hacked into existing code that does not depend on the bug; such
* code can continue to use the familiar JS::Evaluate, etc., entry points.
*/
/**
* Evaluate a script in the scope of the current global of cx.
*/
extern JS_PUBLIC_API bool JS_ExecuteScript(JSContext* cx,
JS::Handle<JSScript*> script,
JS::MutableHandle<JS::Value> rval);
extern JS_PUBLIC_API bool JS_ExecuteScript(JSContext* cx,
JS::Handle<JSScript*> script);
/**
* As above, but providing an explicit scope chain. envChain must not include
* the global object on it; that's implicit. It needs to contain the other
* objects that should end up on the script's scope chain.
*/
extern JS_PUBLIC_API bool JS_ExecuteScript(JSContext* cx,
JS::HandleObjectVector envChain,
JS::Handle<JSScript*> script,
JS::MutableHandle<JS::Value> rval);
extern JS_PUBLIC_API bool JS_ExecuteScript(JSContext* cx,
JS::HandleObjectVector envChain,
JS::Handle<JSScript*> script);
namespace JS {
/**
* Like the above, but handles a cross-compartment script. If the script is
* cross-compartment, it is cloned into the current compartment before
* executing.
*/
extern JS_PUBLIC_API bool CloneAndExecuteScript(JSContext* cx,
Handle<JSScript*> script,
MutableHandle<Value> rval);
/**
* Like CloneAndExecuteScript above, but allows executing under a non-syntactic
* environment chain.
*/
extern JS_PUBLIC_API bool CloneAndExecuteScript(JSContext* cx,
HandleObjectVector envChain,
Handle<JSScript*> script,
MutableHandle<Value> rval);
/**
* Evaluate the given source buffer in the scope of the current global of cx,
* and return the completion value in |rval|.
*/
extern JS_PUBLIC_API bool Evaluate(JSContext* cx,
const ReadOnlyCompileOptions& options,
SourceText<char16_t>& srcBuf,
MutableHandle<Value> rval);
/**
* As above, but providing an explicit scope chain. envChain must not include
* the global object on it; that's implicit. It needs to contain the other
* objects that should end up on the script's scope chain.
*/
extern JS_PUBLIC_API bool Evaluate(JSContext* cx, HandleObjectVector envChain,
const ReadOnlyCompileOptions& options,
SourceText<char16_t>& srcBuf,
MutableHandle<Value> rval);
/**
* Evaluate the provided UTF-8 data in the scope of the current global of |cx|,
* and return the completion value in |rval|. If the data contains invalid
* UTF-8, an error is reported.
*/
extern JS_PUBLIC_API bool Evaluate(JSContext* cx,
const ReadOnlyCompileOptions& options,
SourceText<mozilla::Utf8Unit>& srcBuf,
MutableHandle<Value> rval);
/**
* Evaluate the UTF-8 contents of the file at the given path, and return the
* completion value in |rval|. (The path itself is in the system encoding, not
* [necessarily] UTF-8.) If the contents contain any malformed UTF-8, an error
* is reported.
*/
extern JS_PUBLIC_API bool EvaluateUtf8Path(
JSContext* cx, const ReadOnlyCompileOptions& options, const char* filename,
MutableHandle<Value> rval);
/**
* Compile the provided script using the given options. Return the script on
* success, or return null on failure (usually with an error reported).
*/
extern JS_PUBLIC_API JSScript* Compile(JSContext* cx,
const ReadOnlyCompileOptions& options,
SourceText<char16_t>& srcBuf);
/**
* Compile the provided script using the given options. Return the script on
* success, or return null on failure (usually with an error reported).
*/
extern JS_PUBLIC_API JSScript* Compile(JSContext* cx,
const ReadOnlyCompileOptions& options,
SourceText<mozilla::Utf8Unit>& srcBuf);
/**
* Compile the provided script using the given options, and register an encoder
* on is script source, such that all functions can be encoded as they are
* parsed. This strategy is used to avoid blocking the main thread in a
* non-interruptible way.
*
* See also JS::FinishIncrementalEncoding.
*
* Return the script on success, or return null on failure (usually with an
* error reported)
*/
extern JS_PUBLIC_API JSScript* CompileAndStartIncrementalEncoding(
JSContext* cx, const ReadOnlyCompileOptions& options,
SourceText<char16_t>& srcBuf);
extern JS_PUBLIC_API JSScript* CompileAndStartIncrementalEncoding(
JSContext* cx, const ReadOnlyCompileOptions& options,
SourceText<mozilla::Utf8Unit>& srcBuf);
/**
* Compile the UTF-8 contents of the given file into a script. It is an error
* if the file contains invalid UTF-8. Return the script on success, or return
* null on failure (usually with an error reported).
*/
extern JS_PUBLIC_API JSScript* CompileUtf8File(
JSContext* cx, const ReadOnlyCompileOptions& options, FILE* file);
/**
* Compile the UTF-8 contents of the file at the given path into a script.
* (The path itself is in the system encoding, not [necessarily] UTF-8.) It
* is an error if the file's contents are invalid UTF-8. Return the script on
* success, or return null on failure (usually with an error reported).
*/
extern JS_PUBLIC_API JSScript* CompileUtf8Path(
JSContext* cx, const ReadOnlyCompileOptions& options, const char* filename);
/**
* Compile a function with envChain plus the global as its scope chain.
* envChain must contain objects in the current compartment of cx. The actual
* scope chain used for the function will consist of With wrappers for those
* objects, followed by the current global of the compartment cx is in. This
* global must not be explicitly included in the scope chain.
*/
extern JS_PUBLIC_API JSFunction* CompileFunction(
JSContext* cx, HandleObjectVector envChain,
const ReadOnlyCompileOptions& options, const char* name, unsigned nargs,
const char* const* argnames, SourceText<char16_t>& srcBuf);
/**
* Compile a function with envChain plus the global as its scope chain.
* envChain must contain objects in the current compartment of cx. The actual
* scope chain used for the function will consist of With wrappers for those
* objects, followed by the current global of the compartment cx is in. This
* global must not be explicitly included in the scope chain.
*/
extern JS_PUBLIC_API JSFunction* CompileFunction(
JSContext* cx, HandleObjectVector envChain,
const ReadOnlyCompileOptions& options, const char* name, unsigned nargs,
const char* const* argnames, SourceText<mozilla::Utf8Unit>& srcBuf);
/**
* Identical to the CompileFunction overload above for UTF-8, but with
* Rust-friendly ergonomics.
*/
extern JS_PUBLIC_API JSFunction* CompileFunctionUtf8(
JSContext* cx, HandleObjectVector envChain,
const ReadOnlyCompileOptions& options, const char* name, unsigned nargs,
const char* const* argnames, const char* utf8, size_t length);
/*
* For a script compiled with the hideScriptFromDebugger option, expose the
* script to the debugger by calling the debugger's onNewScript hook.
*/
extern JS_PUBLIC_API void ExposeScriptToDebugger(JSContext* cx,
Handle<JSScript*> script);
/*
* JSScripts have associated with them (via their ScriptSourceObjects) some
* metadata used by the debugger. The following API functions are used to set
* that metadata on scripts, functions and modules.
*
* The metadata consists of:
* - A privateValue, which is used to keep some object value associated
* with the script.
* - The elementAttributeName is used by Gecko
* - The introductionScript is used by the debugger to identify which
* script created which. Only set for dynamicaly generated scripts.
* - scriptOrModule is used to transfer private value metadata from
* script to script
*
* Callers using UpdateDebugMetaData need to have set deferDebugMetadata
* in the compile options; this hides the script from the debugger until
* the debug metadata is provided by the UpdateDebugMetadata call.
*/
extern JS_PUBLIC_API bool UpdateDebugMetadata(
JSContext* cx, Handle<JSScript*> script,
const ReadOnlyCompileOptions& options, HandleValue privateValue,
HandleString elementAttributeName, HandleScript introScript,
HandleScript scriptOrModule);
// The debugger API exposes an optional "element" property on DebuggerSource
// objects. The callback defined here provides that value. SpiderMonkey
// doesn't particularly care about this, but within Firefox the "element" is the
// HTML script tag for the script which DevTools can use for a better debugging
// experience.
extern JS_PUBLIC_API void SetSourceElementCallback(
JSContext* cx, JSSourceElementCallback callback);
} /* namespace JS */
#endif /* js_CompilationAndEvaluation_h */