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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/. */
/*
* Functionality for issuing and handling warnings.
*
* Warnings are situations that aren't inherently full-blown errors (and perhaps
* for spec compliance *can't* be), but that may represent dubious programming
* practice that embeddings may wish to know about.
*
* SpiderMonkey recognizes an unspecified set of syntactic patterns and runtime
* behaviors as triggering a warning. Embeddings may also recognize and report
* additional warnings.
*/
#ifndef js_Warnings_h
#define js_Warnings_h
#include "mozilla/Assertions.h" // MOZ_ASSERT
#include "mozilla/Attributes.h" // MOZ_FORMAT_PRINTF, MOZ_RAII
#include "jstypes.h" // JS_PUBLIC_API
struct JS_PUBLIC_API JSContext;
class JSErrorReport;
namespace JS {
/**
* Report a warning represented by the sprintf-like conversion of ASCII format
* filled from trailing ASCII arguments.
*
* Return true iff the warning was successfully reported without reporting an
* error (or being upgraded into one).
*/
extern JS_PUBLIC_API bool WarnASCII(JSContext* cx, const char* format, ...)
MOZ_FORMAT_PRINTF(2, 3);
/**
* Report a warning represented by the sprintf-like conversion of Latin-1 format
* filled from trailing Latin-1 arguments.
*
* Return true iff the warning was successfully reported without reporting an
* error (or being upgraded into one).
*/
extern JS_PUBLIC_API bool WarnLatin1(JSContext* cx, const char* format, ...)
MOZ_FORMAT_PRINTF(2, 3);
/**
* Report a warning represented by the sprintf-like conversion of UTF-8 format
* filled from trailing UTF-8 arguments.
*
* Return true iff the warning was successfully reported without reporting an
* error (or being upgraded into one).
*/
extern JS_PUBLIC_API bool WarnUTF8(JSContext* cx, const char* format, ...)
MOZ_FORMAT_PRINTF(2, 3);
using WarningReporter = void (*)(JSContext* cx, JSErrorReport* report);
extern JS_PUBLIC_API WarningReporter GetWarningReporter(JSContext* cx);
extern JS_PUBLIC_API WarningReporter
SetWarningReporter(JSContext* cx, WarningReporter reporter);
/**
* A simple RAII class that clears the registered warning reporter on
* construction and restores it on destruction.
*
* A fresh warning reporter *may* be set while an instance of this class is
* live, but it must be unset in LIFO fashion by the time that instance is
* destroyed.
*/
class MOZ_RAII JS_PUBLIC_API AutoSuppressWarningReporter {
JSContext* context_;
WarningReporter prevReporter_;
public:
explicit AutoSuppressWarningReporter(JSContext* cx) : context_(cx) {
prevReporter_ = SetWarningReporter(context_, nullptr);
}
~AutoSuppressWarningReporter() {
#ifdef DEBUG
WarningReporter reporter =
#endif
SetWarningReporter(context_, prevReporter_);
MOZ_ASSERT(reporter == nullptr, "Unexpected WarningReporter active");
SetWarningReporter(context_, prevReporter_);
}
};
} // namespace JS
#endif // js_Warnings_h