1332245 - Move nsScriptError from js/xpconnect to dom/bindings.

2 files changed, 215 insertions, 0 deletions

diff --git a/js/src/vm/ErrorReporting.cpp b/js/src/vm/ErrorReporting.cpp
new file mode 100644
index 000000000..5877f3a4b
--- /dev/null
+++ b/js/src/vm/ErrorReporting.cpp
@@ -0,0 +1,124 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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/. */
+
+#include "vm/ErrorReporting.h"
+
+#include "mozilla/Move.h"
+
+#include <stdarg.h>
+
+#include "jscntxt.h"
+#include "jsexn.h"
+
+using mozilla::Move;
+
+using JS::UniqueTwoByteChars;
+
+void
+CallWarningReporter(JSContext* cx, JSErrorReport* reportp)
+{
+    MOZ_ASSERT(reportp);
+    MOZ_ASSERT(JSREPORT_IS_WARNING(reportp->flags));
+
+    if (JS::WarningReporter warningReporter = cx->runtime()->warningReporter)
+        warningReporter(cx, reportp);
+}
+
+void
+CompileError::throwError(JSContext* cx)
+{
+    if (JSREPORT_IS_WARNING(flags)) {
+        CallWarningReporter(cx, this);
+        return;
+    }
+
+    // If there's a runtime exception type associated with this error
+    // number, set that as the pending exception.  For errors occuring at
+    // compile time, this is very likely to be a JSEXN_SYNTAXERR.
+    //
+    // If an exception is thrown but not caught, the JSREPORT_EXCEPTION
+    // flag will be set in report.flags.  Proper behavior for an error
+    // reporter is to ignore a report with this flag for all but top-level
+    // compilation errors.  The exception will remain pending, and so long
+    // as the non-top-level "load", "eval", or "compile" native function
+    // returns false, the top-level reporter will eventually receive the
+    // uncaught exception report.
+    ErrorToException(cx, this, nullptr, nullptr);
+}
+
+bool
+ReportCompileWarning(JSContext* cx, ErrorMetadata&& metadata, UniquePtr<JSErrorNotes> notes,
+                         unsigned flags, unsigned errorNumber, va_list args)
+{
+    // On the main thread, report the error immediately. When compiling off
+    // thread, save the error so that the thread finishing the parse can report
+    // it later.
+    CompileError tempErr;
+    CompileError* err = &tempErr;
+    if (!cx->isJSContext() && !cx->addPendingCompileError(&err)) {
+        return false;
+    }
+
+    err->notes = Move(notes);
+    err->flags = flags;
+    err->errorNumber = errorNumber;
+
+    err->filename = metadata.filename;
+    err->lineno = metadata.lineNumber;
+    err->column = metadata.columnNumber;
+    err->isMuted = metadata.isMuted;
+
+    if (UniqueTwoByteChars lineOfContext = Move(metadata.lineOfContext))
+        err->initOwnedLinebuf(lineOfContext.release(), metadata.lineLength, metadata.tokenOffset);
+
+    if (!ExpandErrorArgumentsVA(cx, GetErrorMessage, nullptr, errorNumber,
+                                nullptr, ArgumentsAreLatin1, err, args))
+    {
+        return false;
+    }
+
+    if (cx->isJSContext()) {
+        err->throwError(cx->asJSContext());
+    }
+
+    return true;
+}
+
+void
+ReportCompileError(JSContext* cx, ErrorMetadata&& metadata, UniquePtr<JSErrorNotes> notes,
+                       unsigned flags, unsigned errorNumber, va_list args)
+{
+    // On the main thread, report the error immediately. When compiling off
+    // thread, save the error so that the thread finishing the parse can report
+    // it later.
+    CompileError tempErr;
+    CompileError* err = &tempErr;
+    if (!cx->isJSContext() && !cx->addPendingCompileError(&err)) {
+        return;
+    }
+
+    err->notes = Move(notes);
+    err->flags = flags;
+    err->errorNumber = errorNumber;
+
+    err->filename = metadata.filename;
+    err->lineno = metadata.lineNumber;
+    err->column = metadata.columnNumber;
+    err->isMuted = metadata.isMuted;
+
+    if (UniqueTwoByteChars lineOfContext = Move(metadata.lineOfContext))
+        err->initOwnedLinebuf(lineOfContext.release(), metadata.lineLength, metadata.tokenOffset);
+
+    if (!ExpandErrorArgumentsVA(cx, GetErrorMessage, nullptr, errorNumber,
+                                nullptr, ArgumentsAreLatin1, err, args))
+    {
+        return;
+    }
+
+    if (cx->isJSContext()) {
+        err->throwError(cx->asJSContext());
+    }
+}
diff --git a/js/src/vm/ErrorReporting.h b/js/src/vm/ErrorReporting.h
new file mode 100644
index 000000000..02bbe2c63
--- /dev/null
+++ b/js/src/vm/ErrorReporting.h
@@ -0,0 +1,91 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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_ErrorReporting_h
+#define vm_ErrorReporting_h
+
+#include "mozilla/Move.h"
+
+#include <stdarg.h>
+
+#include "jsapi.h" // for JSErrorNotes, JSErrorReport
+
+#include "js/UniquePtr.h" // for UniquePtr
+#include "js/Utility.h" // for UniqueTwoByteChars
+
+struct JSContext;
+
+namespace js {
+
+/**
+ * Metadata for a compilation error (or warning) at a particular offset, or at
+ * no offset (i.e. with respect to a script overall).
+ */
+struct ErrorMetadata
+{
+    // The file/URL where the error occurred.
+    const char* filename;
+
+    // The line and column numbers where the error occurred.  If the error
+    // is with respect to the entire script and not with respect to a
+    // particular location, these will both be zero.
+    uint32_t lineNumber;
+    uint32_t columnNumber;
+
+    // If the error occurs at a particular location, context surrounding the
+    // location of the error: the line that contained the error, or a small
+    // portion of it if the line is long.
+    //
+    // This information is provided on a best-effort basis: code populating
+    // ErrorMetadata instances isn't obligated to supply this.
+    JS::UniqueTwoByteChars lineOfContext;
+
+    // If |lineOfContext| is non-null, its length.
+    size_t lineLength;
+
+    // If |lineOfContext| is non-null, the offset within it of the token that
+    // triggered the error.
+    size_t tokenOffset;
+
+    // Whether the error is "muted" because it derives from a cross-origin
+    // load.  See the comment in TransitiveCompileOptions in jsapi.h for
+    // details.
+    bool isMuted;
+};
+
+class CompileError : public JSErrorReport
+{
+  public:
+    void throwError(JSContext* cx);
+};
+
+/** Send a JSErrorReport to the warningReporter callback. */
+extern void
+CallWarningReporter(JSContext* cx, JSErrorReport* report);
+
+/**
+ * Report a compile error during script processing prior to execution of the
+ * script.
+ */
+extern void
+ReportCompileError(ErrorMetadata&& metadata, UniquePtr<JSErrorNotes> notes,
+                   unsigned flags, unsigned errorNumber, va_list args);
+
+/**
+ * Report a compile warning during script processing prior to execution of the
+ * script.  Returns true if the warning was successfully reported, false if an
+ * error occurred.
+ *
+ * This function DOES NOT respect an existing werror option.  If the caller
+ * wishes such option to be respected, it must do so itself.
+ */
+extern MOZ_MUST_USE bool
+ReportCompileWarning(JSContext* cx, ErrorMetadata&& metadata, UniquePtr<JSErrorNotes> notes,
+                     unsigned flags, unsigned errorNumber, va_list args);
+
+} // namespace js
+
+#endif /* vm_ErrorReporting_h */