mfbt/MacroForEach.h
author Dustin J. Mitchell <dustin@mozilla.com>
Wed, 07 Sep 2016 00:10:51 +0000
changeset 354971 1627fd341fc154d4fb771366676b7101204362df
parent 287542 0fdb9415359330d25b7db5f79e484b588d74eaa7
child 394523 9d30ac5bca6e1db8e4acd737dd017f4f213e815e
permissions -rw-r--r--
Bug 1286075: allow optimization of tasks whose dependencies have not been optimized; r=armenzg MikeLing initially did this in bug 1287018. The intent of this conditional was to make optimization faster by not even checking most tasks, based on the assumption that if the prerequisite to a task has changed (for example, a docker image or a build), then naturally we will want to execute that task. However, as we have developed actual optimization methods, this has proven not to be the case: we might want to optimize a test out if its inputs have not changed, even if a new installer has been built. Similarly, SETA may optimize tasks out even if their inputs have changed. MozReview-Commit-ID: LgHET3Z84GB

/* -*- 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/. */

/*
 * Implements a higher-order macro for iteratively calling another macro with
 * fixed leading arguments, plus a trailing element picked from a second list
 * of arguments.
 */

#ifndef mozilla_MacroForEach_h
#define mozilla_MacroForEach_h

#include "mozilla/MacroArgs.h"

/*
 * MOZ_FOR_EACH(aMacro, aFixedArgs, aArgs) expands to N calls to the macro
 * |aMacro| where N is equal the number of items in the list |aArgs|. The
 * arguments for each |aMacro| call are composed of *all* arguments in the list
 * |aFixedArgs| as well as a single argument in the list |aArgs|. For example:
 *
 *   #define MACRO_A(x) x +
 *   int a = MOZ_FOR_EACH(MACRO_A, (), (1, 2, 3)) 0;
 *   // Expands to:     MACRO_A(1) MACRO_A(2) MACRO_A(3) 0;
 *   // And further to: 1 + 2 + 3 + 0;
 *
 *   #define MACRO_B(k, x) (k + x) +
 *   int b = MOZ_FOR_EACH(MACRO_B, (5,), (1, 2)) 0;
 *   // Expands to: MACRO_B(5, 1) MACRO_B(5, 2) 0;
 *
 *   #define MACRO_C(k1, k2, x) (k1 + k2 + x) +
 *   int c = MOZ_FOR_EACH(MACRO_C, (5, 8,), (1, 2)) 0;
 *   // Expands to: MACRO_B(5, 8, 1) MACRO_B(5, 8, 2) 0;
 *
 * If the |aFixedArgs| list is not empty, a trailing comma must be included.
 *
 * The |aArgs| list must be not be empty and may be up to 50 items long. Use
 * MOZ_STATIC_ASSERT_VALID_ARG_COUNT to ensure that violating this constraint
 * results in a compile-time error.
 */
#define MOZ_FOR_EACH_EXPAND_HELPER(...) __VA_ARGS__
#define MOZ_FOR_EACH_GLUE(a, b) a b
#define MOZ_FOR_EACH(aMacro, aFixedArgs, aArgs) \
  MOZ_FOR_EACH_GLUE( \
    MOZ_PASTE_PREFIX_AND_ARG_COUNT(MOZ_FOR_EACH_, \
                                   MOZ_FOR_EACH_EXPAND_HELPER aArgs), \
    (aMacro, aFixedArgs, aArgs))

#define MOZ_FOR_EACH_HELPER_GLUE(a, b) a b
#define MOZ_FOR_EACH_HELPER(aMacro, aFixedArgs, aArgs) \
  MOZ_FOR_EACH_HELPER_GLUE( \
    aMacro, \
    (MOZ_FOR_EACH_EXPAND_HELPER aFixedArgs MOZ_ARG_1 aArgs))

#define MOZ_FOR_EACH_1(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a)
#define MOZ_FOR_EACH_2(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_1(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_3(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_2(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_4(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_3(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_5(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_4(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_6(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_5(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_7(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_6(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_8(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_7(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_9(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_8(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_10(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_9(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_11(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_10(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_12(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_11(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_13(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_12(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_14(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_13(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_15(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_14(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_16(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_15(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_17(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_16(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_18(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_17(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_19(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_18(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_20(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_19(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_21(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_20(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_22(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_21(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_23(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_22(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_24(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_23(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_25(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_24(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_26(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_25(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_27(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_26(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_28(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_27(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_29(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_28(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_30(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_29(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_31(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_30(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_32(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_31(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_33(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_32(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_34(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_33(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_35(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_34(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_36(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_35(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_37(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_36(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_38(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_37(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_39(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_38(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_40(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_39(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_41(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_40(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_42(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_41(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_43(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_42(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_44(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_43(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_45(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_44(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_46(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_45(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_47(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_46(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_48(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_47(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_49(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_48(m, fa, (MOZ_ARGS_AFTER_1 a))
#define MOZ_FOR_EACH_50(m, fa, a) \
  MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_49(m, fa, (MOZ_ARGS_AFTER_1 a))

#endif /* mozilla_MacroForEach_h */