Adding upstream version 86.0.1.upstream/86.0.1upstream

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

1 files changed, 352 insertions, 0 deletions

diff --git a/js/src/frontend/ErrorReporter.h b/js/src/frontend/ErrorReporter.h
new file mode 100644
index 0000000000..879095d24f
--- /dev/null
+++ b/js/src/frontend/ErrorReporter.h
@@ -0,0 +1,352 @@
+/* -*- 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/. */
+
+#ifndef frontend_ErrorReporter_h
+#define frontend_ErrorReporter_h
+
+#include "mozilla/Variant.h"
+
+#include <stdarg.h>  // for va_list
+#include <stddef.h>  // for size_t
+#include <stdint.h>  // for uint32_t
+
+#include "js/CompileOptions.h"
+#include "js/UniquePtr.h"
+#include "vm/ErrorReporting.h"  // ErrorMetadata, ReportCompile{Error,Warning}
+
+class JSErrorNotes;
+
+namespace js {
+namespace frontend {
+
+// An interface class to provide strictMode getter method, which is used by
+// ErrorReportMixin::strictModeError* methods.
+//
+// This class is separated to be used as a back-channel from TokenStream to the
+// strict mode flag which is available inside Parser, to avoid exposing the
+// rest of SharedContext to TokenStream.
+class StrictModeGetter {
+ public:
+  virtual bool strictMode() const = 0;
+};
+
+// This class provides error reporting methods, including warning, extra
+// warning, and strict mode error.
+//
+// A class that inherits this class must provide the following methods:
+//   * options
+//   * getContext
+//   * computeErrorMetadata
+class ErrorReportMixin : public StrictModeGetter {
+ public:
+  // Returns a compile options (extra warning, warning as error) for current
+  // compilation.
+  virtual const JS::ReadOnlyCompileOptions& options() const = 0;
+
+  // Returns the current context.
+  virtual JSContext* getContext() const = 0;
+
+  // A variant class for the offset of the error or warning.
+  struct Current {};
+  struct NoOffset {};
+  using ErrorOffset = mozilla::Variant<uint32_t, Current, NoOffset>;
+
+  // Fills ErrorMetadata fields for an error or warning at given offset.
+  //   * offset is uint32_t if methods ending with "At" is called
+  //   * offset is NoOffset if methods ending with "NoOffset" is called
+  //   * offset is Current otherwise
+  virtual MOZ_MUST_USE bool computeErrorMetadata(ErrorMetadata* err,
+                                                 const ErrorOffset& offset) = 0;
+
+  // ==== error ====
+  //
+  // Reports an error.
+  //
+  // Methods ending with "At" are for an error at given offset.
+  // The offset is passed to computeErrorMetadata method and is transparent
+  // for this class.
+  //
+  // Methods ending with "NoOffset" are for an error that doesn't correspond
+  // to any offset. NoOffset is passed to computeErrorMetadata for them.
+  //
+  // Other methods except errorWithNotesAtVA are for an error at the current
+  // offset. Current is passed to computeErrorMetadata for them.
+  //
+  // Methods contains "WithNotes" can be used if there are error notes.
+  //
+  // errorWithNotesAtVA is the actual implementation for all of above.
+  // This can be called if the caller already has a va_list.
+
+  void error(unsigned errorNumber, ...) {
+    va_list args;
+    va_start(args, errorNumber);
+
+    errorWithNotesAtVA(nullptr, mozilla::AsVariant(Current()), errorNumber,
+                       &args);
+
+    va_end(args);
+  }
+  void errorWithNotes(UniquePtr<JSErrorNotes> notes, unsigned errorNumber,
+                      ...) {
+    va_list args;
+    va_start(args, errorNumber);
+
+    errorWithNotesAtVA(std::move(notes), mozilla::AsVariant(Current()),
+                       errorNumber, &args);
+
+    va_end(args);
+  }
+  void errorAt(uint32_t offset, unsigned errorNumber, ...) {
+    va_list args;
+    va_start(args, errorNumber);
+
+    errorWithNotesAtVA(nullptr, mozilla::AsVariant(offset), errorNumber, &args);
+
+    va_end(args);
+  }
+  void errorWithNotesAt(UniquePtr<JSErrorNotes> notes, uint32_t offset,
+                        unsigned errorNumber, ...) {
+    va_list args;
+    va_start(args, errorNumber);
+
+    errorWithNotesAtVA(std::move(notes), mozilla::AsVariant(offset),
+                       errorNumber, &args);
+
+    va_end(args);
+  }
+  void errorNoOffset(unsigned errorNumber, ...) {
+    va_list args;
+    va_start(args, errorNumber);
+
+    errorWithNotesAtVA(nullptr, mozilla::AsVariant(NoOffset()), errorNumber,
+                       &args);
+
+    va_end(args);
+  }
+  void errorWithNotesNoOffset(UniquePtr<JSErrorNotes> notes,
+                              unsigned errorNumber, ...) {
+    va_list args;
+    va_start(args, errorNumber);
+
+    errorWithNotesAtVA(std::move(notes), mozilla::AsVariant(NoOffset()),
+                       errorNumber, &args);
+
+    va_end(args);
+  }
+  void errorWithNotesAtVA(UniquePtr<JSErrorNotes> notes,
+                          const ErrorOffset& offset, unsigned errorNumber,
+                          va_list* args) {
+    ErrorMetadata metadata;
+    if (!computeErrorMetadata(&metadata, offset)) {
+      return;
+    }
+
+    ReportCompileErrorLatin1(getContext(), std::move(metadata),
+                             std::move(notes), errorNumber, args);
+  }
+
+  // ==== warning ====
+  //
+  // Reports a warning.
+  //
+  // Returns true if the warning is reported.
+  // Returns false if the warning is treated as an error, or an error occurs
+  // while reporting.
+  //
+  // See the comment on the error section for details on what the arguments
+  // and function names indicate for all these functions.
+
+  MOZ_MUST_USE bool warning(unsigned errorNumber, ...) {
+    va_list args;
+    va_start(args, errorNumber);
+
+    bool result = warningWithNotesAtVA(nullptr, mozilla::AsVariant(Current()),
+                                       errorNumber, &args);
+
+    va_end(args);
+
+    return result;
+  }
+  MOZ_MUST_USE bool warningAt(uint32_t offset, unsigned errorNumber, ...) {
+    va_list args;
+    va_start(args, errorNumber);
+
+    bool result = warningWithNotesAtVA(nullptr, mozilla::AsVariant(offset),
+                                       errorNumber, &args);
+
+    va_end(args);
+
+    return result;
+  }
+  MOZ_MUST_USE bool warningNoOffset(unsigned errorNumber, ...) {
+    va_list args;
+    va_start(args, errorNumber);
+
+    bool result = warningWithNotesAtVA(nullptr, mozilla::AsVariant(NoOffset()),
+                                       errorNumber, &args);
+
+    va_end(args);
+
+    return result;
+  }
+  MOZ_MUST_USE bool warningWithNotesAtVA(UniquePtr<JSErrorNotes> notes,
+                                         const ErrorOffset& offset,
+                                         unsigned errorNumber, va_list* args) {
+    ErrorMetadata metadata;
+    if (!computeErrorMetadata(&metadata, offset)) {
+      return false;
+    }
+
+    return compileWarning(std::move(metadata), std::move(notes), errorNumber,
+                          args);
+  }
+
+  // ==== strictModeError ====
+  //
+  // Reports an error if in strict mode code, or warn if not.
+  //
+  // Returns true if not in strict mode and a warning is reported.
+  // Returns false if the error reported, or an error occurs while reporting.
+  //
+  // See the comment on the error section for details on what the arguments
+  // and function names indicate for all these functions.
+
+  MOZ_MUST_USE bool strictModeError(unsigned errorNumber, ...) {
+    va_list args;
+    va_start(args, errorNumber);
+
+    bool result = strictModeErrorWithNotesAtVA(
+        nullptr, mozilla::AsVariant(Current()), errorNumber, &args);
+
+    va_end(args);
+
+    return result;
+  }
+  MOZ_MUST_USE bool strictModeErrorWithNotes(UniquePtr<JSErrorNotes> notes,
+                                             unsigned errorNumber, ...) {
+    va_list args;
+    va_start(args, errorNumber);
+
+    bool result = strictModeErrorWithNotesAtVA(
+        std::move(notes), mozilla::AsVariant(Current()), errorNumber, &args);
+
+    va_end(args);
+
+    return result;
+  }
+  MOZ_MUST_USE bool strictModeErrorAt(uint32_t offset, unsigned errorNumber,
+                                      ...) {
+    va_list args;
+    va_start(args, errorNumber);
+
+    bool result = strictModeErrorWithNotesAtVA(
+        nullptr, mozilla::AsVariant(offset), errorNumber, &args);
+
+    va_end(args);
+
+    return result;
+  }
+  MOZ_MUST_USE bool strictModeErrorWithNotesAt(UniquePtr<JSErrorNotes> notes,
+                                               uint32_t offset,
+                                               unsigned errorNumber, ...) {
+    va_list args;
+    va_start(args, errorNumber);
+
+    bool result = strictModeErrorWithNotesAtVA(
+        std::move(notes), mozilla::AsVariant(offset), errorNumber, &args);
+
+    va_end(args);
+
+    return result;
+  }
+  MOZ_MUST_USE bool strictModeErrorNoOffset(unsigned errorNumber, ...) {
+    va_list args;
+    va_start(args, errorNumber);
+
+    bool result = strictModeErrorWithNotesAtVA(
+        nullptr, mozilla::AsVariant(NoOffset()), errorNumber, &args);
+
+    va_end(args);
+
+    return result;
+  }
+  MOZ_MUST_USE bool strictModeErrorWithNotesNoOffset(
+      UniquePtr<JSErrorNotes> notes, unsigned errorNumber, ...) {
+    va_list args;
+    va_start(args, errorNumber);
+
+    bool result = strictModeErrorWithNotesAtVA(
+        std::move(notes), mozilla::AsVariant(NoOffset()), errorNumber, &args);
+
+    va_end(args);
+
+    return result;
+  }
+  MOZ_MUST_USE bool strictModeErrorWithNotesAtVA(UniquePtr<JSErrorNotes> notes,
+                                                 const ErrorOffset& offset,
+                                                 unsigned errorNumber,
+                                                 va_list* args) {
+    if (!strictMode()) {
+      return true;
+    }
+
+    ErrorMetadata metadata;
+    if (!computeErrorMetadata(&metadata, offset)) {
+      return false;
+    }
+
+    ReportCompileErrorLatin1(getContext(), std::move(metadata),
+                             std::move(notes), errorNumber, args);
+    return false;
+  }
+
+  // Reports a warning, or an error if the warning is treated as an error.
+  MOZ_MUST_USE bool compileWarning(ErrorMetadata&& metadata,
+                                   UniquePtr<JSErrorNotes> notes,
+                                   unsigned errorNumber, va_list* args) {
+    return ReportCompileWarning(getContext(), std::move(metadata),
+                                std::move(notes), errorNumber, args);
+  }
+};
+
+// An interface class to provide miscellaneous methods used by error reporting
+// etc.  They're mostly used by BytecodeCompiler, BytecodeEmitter, and helper
+// classes for emitter.
+class ErrorReporter : public ErrorReportMixin {
+ public:
+  // Returns the line and column numbers for given offset.
+  virtual void lineAndColumnAt(size_t offset, uint32_t* line,
+                               uint32_t* column) const = 0;
+
+  // Returns the line and column numbers for current offset.
+  virtual void currentLineAndColumn(uint32_t* line, uint32_t* column) const = 0;
+
+  // Sets *onThisLine to true if the given offset is inside the given line
+  // number `lineNum`, or false otherwise, and returns true.
+  //
+  // Return false if an error happens.  This method itself doesn't report an
+  // error, and any failure is supposed to be reported as OOM in the caller.
+  virtual bool isOnThisLine(size_t offset, uint32_t lineNum,
+                            bool* onThisLine) const = 0;
+
+  // Returns the line number for given offset.
+  virtual uint32_t lineAt(size_t offset) const = 0;
+
+  // Returns the column number for given offset.
+  virtual uint32_t columnAt(size_t offset) const = 0;
+
+  // Returns true if tokenization is already started and hasn't yet finished.
+  // currentLineAndColumn returns meaningful value only if this is true.
+  virtual bool hasTokenizationStarted() const = 0;
+
+  // Returns the filename which is currently being compiled.
+  virtual const char* getFilename() const = 0;
+};
+
+}  // namespace frontend
+}  // namespace js
+
+#endif  // frontend_ErrorReporter_h