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Bug 989460 - Part 2: Add MOZ_FOR_EACH macro. r=Waldo

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This commit is contained in:
Birunthan Mohanathas 2014-04-24 10:49:00 +02:00
parent bb2bad074f
commit fd2b5ff869
4 changed files with 191 additions and 0 deletions
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158
mfbt/MacroForEach.h Normal file
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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/. */
/*
* 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 */

1
mfbt/moz.build
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@ -37,6 +37,7 @@ EXPORTS.mozilla = [
'Likely.h',
'LinkedList.h',
'MacroArgs.h',
'MacroForEach.h',
'MathAlgorithms.h',
'Maybe.h',
'MemoryChecking.h',

31
mfbt/tests/TestMacroForEach.cpp Normal file
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@ -0,0 +1,31 @@
/* -*- 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/. */
#include "mozilla/Assertions.h"
#include "mozilla/MacroForEach.h"
#define HELPER_IDENTITY_PLUS(x) x +
static_assert(MOZ_FOR_EACH(HELPER_IDENTITY_PLUS, (), (10)) 0 == 10, "");
static_assert(MOZ_FOR_EACH(HELPER_IDENTITY_PLUS, (), (1, 1, 1)) 0 == 3, "");
#define HELPER_DEFINE_VAR(x) const int test1_##x = x;
MOZ_FOR_EACH(HELPER_DEFINE_VAR, (), (10, 20))
static_assert(test1_10 == 10 && test1_20 == 20, "");
#define HELPER_DEFINE_VAR2(k, x) const int test2_##x = k + x;
MOZ_FOR_EACH(HELPER_DEFINE_VAR2, (5,), (10, 20))
static_assert(test2_10 == 15 && test2_20 == 25, "");
#define HELPER_IDENTITY_COMMA(k1, k2, x) k1, k2, x,
int main()
{
const int a[] = { MOZ_FOR_EACH(HELPER_IDENTITY_COMMA, (1, 2,), (10, 20, 30)) };
MOZ_RELEASE_ASSERT(a[0] == 1 && a[1] == 2 && a[2] == 10 &&
a[3] == 1 && a[4] == 2 && a[5] == 20 &&
a[6] == 1 && a[7] == 2 && a[8] == 30,
"MOZ_FOR_EACH args enumerated in incorrect order");
}

1
mfbt/tests/moz.build
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@ -18,6 +18,7 @@ CPP_UNIT_TESTS += [
'TestFloatingPoint.cpp',
'TestIntegerPrintfMacros.cpp',
'TestMacroArgs.cpp',
'TestMacroForEach.cpp',
'TestRollingMean.cpp',
'TestSHA1.cpp',
'TestTypedEnum.cpp',