| 1 | #pragma once
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| 2 |
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| 3 | //#include <assert.h>
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| 4 |
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| 5 |
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| 6 | forall( __CFA_tysys_id_only_X & ) struct tag {};
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| 7 | #define ttag(T) ((tag(T)){})
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| 8 | #define ztag(n) ttag(n)
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| 9 |
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| 10 | #ifdef __CFA_DEBUG__
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| 11 | #define subcheck( arr, sub, lb, ub ) \
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| 12 | if ( (sub) < (lb) || (sub) >= (ub) ) \
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| 13 | abort( "subscript %ld exceeds dimension range [%d,%zd) for array %p.\n", \
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| 14 | (sub), (lb), (ub), (arr) )
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| 15 | #else
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| 16 | #define subcheck( arr, sub, lb, ub ) do {} while (0)
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| 17 | #endif
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| 18 |
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| 19 | //
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| 20 | // The `array` macro is the public interface.
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| 21 | // It computes the type of a dense (trivially strided) array.
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| 22 | // All user-declared objects are dense arrays.
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| 23 | //
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| 24 | // The `arpk` (ARray with PacKing info explicit) type is, generally, a slice with _any_ striding.
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| 25 | // This type is meant for internal use.
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| 26 | // CFA programmers should not instantiate it directly, nor access its field.
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| 27 | // CFA programmers should call ?[?] on it.
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| 28 | // Yet user-given `array(stuff)` expands to `arpk(stuff')`.
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| 29 | // The comments here explain the resulting internals.
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| 30 | //
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| 31 | // Just as a plain-C "multidimesional" array is really array-of-array-of-...,
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| 32 | // so does arpk generally show up as arpk-of-arpk-of...
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| 33 | //
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| 34 | // In the example of `array(float, 3, 4, 5) a;`,
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| 35 | // `typeof(a)` is an `arpk` instantiation.
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| 36 | // These comments explain _its_ arguments, i.e. those of the topmost `arpk` level.
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| 37 | //
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| 38 | // [N] : the number of elements in `a`; 3 in the example
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| 39 | // S : carries the stride size (distance in bytes between &myA[0] and &myA[1]), in sizeof(S);
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| 40 | // same as Timmed when striding is trivial, same as Timmed in the example
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| 41 | // Timmed : (T-immediate) the inner type; conceptually, `typeof(a)` is "arpk of Timmed";
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| 42 | // array(float, 4, 5) in the example
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| 43 | // Tbase : (T-base) the deepest element type that is not arpk; float in the example
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| 44 | //
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| 45 | forall( [N], S & | sized(S), Timmed &, Tbase & ) {
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| 46 | //
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| 47 | // Single-dim array struct (with explicit packing and atom)
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| 48 | //
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| 49 | struct arpk {
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| 50 | S strides[N];
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| 51 | };
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| 52 |
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| 53 | // About the choice of integral types offered as subscript overloads:
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| 54 | // Intent is to cover these use cases:
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| 55 | // a[0] // i : zero_t
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| 56 | // a[1] // i : one_t
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| 57 | // a[2] // i : int
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| 58 | // float foo( ptrdiff_t i ) { return a[i]; } // i : ptrdiff_t
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| 59 | // float foo( size_t i ) { return a[i]; } // i : size_t
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| 60 | // forall( [N] ) ... for( i; N ) { total += a[i]; } // i : typeof( sizeof(42) )
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| 61 | // for( i; 5 ) { total += a[i]; } // i : int
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| 62 | //
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| 63 | // It gets complicated by:
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| 64 | // - CFA does overloading on concrete types, like int and unsigned int, not on typedefed
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| 65 | // types like size_t. So trying to overload on ptrdiff_t vs int works in 64-bit mode
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| 66 | // but not in 32-bit mode.
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| 67 | // - Given bug of Trac #247, CFA gives sizeof expressions type unsigned long int, when it
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| 68 | // should give them type size_t.
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| 69 | //
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| 70 | // gcc -m32 cfa -m32 given bug gcc -m64 (and cfa)
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| 71 | // ptrdiff_t int int long int
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| 72 | // size_t unsigned int unsigned int unsigned long int
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| 73 | // typeof( sizeof(42) ) unsigned int unsigned long int unsigned long int
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| 74 | // int int int int
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| 75 | //
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| 76 | // So the solution must support types {zero_t, one_t, int, unsigned int, long int, unsigned long int}
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| 77 | //
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| 78 | // The solution cannot rely on implicit conversions (e.g. just have one overload for ptrdiff_t)
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| 79 | // because assertion satisfaction requires types to match exacly. Both higher-dimensional
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| 80 | // subscripting and operations on slices use asserted subscript operators. The test case
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| 81 | // array-container/array-sbscr-cases covers the combinations. Mike beleives that commenting out
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| 82 | // any of the current overloads leads to one of those cases failing, either on 64- or 32-bit.
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| 83 | // Mike is open to being shown a smaller set of overloads that still passes the test.
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| 84 |
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| 85 | static inline Timmed & ?[?]( arpk( N, S, Timmed, Tbase ) & a, zero_t ) {
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| 86 | //assert( 0 < N );
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| 87 | subcheck( a, 0L, 0, N );
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| 88 | return (Timmed &)a.strides[0];
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| 89 | }
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| 90 |
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| 91 | static inline Timmed & ?[?]( arpk( N, S, Timmed, Tbase ) & a, one_t ) {
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| 92 | //assert( 1 < N );
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| 93 | subcheck( a, 1L, 0, N );
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| 94 | return (Timmed &)a.strides[1];
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| 95 | }
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| 96 |
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| 97 | static inline Timmed & ?[?]( arpk( N, S, Timmed, Tbase ) & a, int i ) {
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| 98 | //assert( i < N );
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| 99 | subcheck( a, (long int)i, 0, N );
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| 100 | return (Timmed &)a.strides[i];
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| 101 | }
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| 102 |
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| 103 | static inline const Timmed & ?[?]( const arpk( N, S, Timmed, Tbase ) & a, int i ) {
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| 104 | //assert( i < N );
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| 105 | subcheck( a, (long int)i, 0, N );
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| 106 | return (Timmed &)a.strides[i];
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| 107 | }
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| 108 |
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| 109 | static inline Timmed & ?[?]( arpk( N, S, Timmed, Tbase ) & a, unsigned int i ) {
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| 110 | //assert( i < N );
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| 111 | subcheck( a, (long int)i, 0, N );
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| 112 | return (Timmed &)a.strides[i];
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| 113 | }
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| 114 |
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| 115 | static inline const Timmed & ?[?]( const arpk( N, S, Timmed, Tbase ) & a, unsigned int i ) {
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| 116 | //assert( i < N );
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| 117 | subcheck( a, (unsigned long int)i, 0, N );
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| 118 | return (Timmed &)a.strides[i];
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| 119 | }
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| 120 |
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| 121 | static inline Timmed & ?[?]( arpk( N, S, Timmed, Tbase ) & a, long int i ) {
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| 122 | //assert( i < N );
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| 123 | subcheck( a, i, 0, N );
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| 124 | return (Timmed &)a.strides[i];
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| 125 | }
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| 126 |
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| 127 | static inline const Timmed & ?[?]( const arpk( N, S, Timmed, Tbase ) & a, long int i ) {
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| 128 | //assert( i < N );
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| 129 | subcheck( a, i, 0, N );
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| 130 | return (Timmed &)a.strides[i];
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| 131 | }
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| 132 |
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| 133 | static inline Timmed & ?[?]( arpk( N, S, Timmed, Tbase ) & a, unsigned long int i ) {
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| 134 | //assert( i < N );
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| 135 | subcheck( a, i, 0, N );
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| 136 | return (Timmed &)a.strides[i];
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| 137 | }
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| 138 |
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| 139 | static inline const Timmed & ?[?]( const arpk( N, S, Timmed, Tbase ) & a, unsigned long int i ) {
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| 140 | //assert( i < N );
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| 141 | subcheck( a, i, 0, N );
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| 142 | return (Timmed &)a.strides[i];
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| 143 | }
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| 144 |
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| 145 | static inline size_t ?`len( arpk( N, S, Timmed, Tbase ) & a ) {
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| 146 | return N;
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| 147 | }
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| 148 |
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| 149 | static inline void __taglen( tag(arpk( N, S, Timmed, Tbase )), tag(N) ) {}
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| 150 | }
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| 151 |
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| 152 | // RAII pattern has workarounds for
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| 153 | // - Trac 226: Simplest handling would be, require immediate element to be otype, let autogen
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| 154 | // raii happen. Performance on even a couple dimensions is unacceptable because of exponential
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| 155 | // thunk creation: ?{}() needs all four otype funcs from next level, so does ^?{}(), so do the
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| 156 | // other two. This solution offers ?{}() that needs only ?{}(), and similar for ^?{}.
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| 157 |
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| 158 | // skip initializing elements
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| 159 | // array(float, 5) x = { delay_init };
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| 160 | enum () delay_init_t { delay_init };
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| 161 | forall( [N], S & | sized(S), Timmed &, Tbase & )
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| 162 | static inline void ?{}( arpk( N, S, Timmed, Tbase ) & this, delay_init_t ) {
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| 163 | void ?{}( S (&)[N] ) {}
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| 164 | ?{}(this.strides);
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| 165 | }
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| 166 |
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| 167 | // call default ctor on elements
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| 168 | // array(float, 5) x;
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| 169 | forall( [N], S & | sized(S), Timmed &, Tbase & | { void ?{}( Timmed & ); } )
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| 170 | static inline void ?{}( arpk( N, S, Timmed, Tbase ) & this ) {
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| 171 | ?{}( this, delay_init );
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| 172 | for (i; N) ?{}( (Timmed &)this.strides[i] );
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| 173 | }
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| 174 |
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| 175 | forall( [N], S & | sized(S), Timmed &, Tbase & | { void ^?{}( Timmed & ); } )
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| 176 | static inline void ^?{}( arpk( N, S, Timmed, Tbase ) & this ) {
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| 177 | void ^?{}( S (&)[N] ) {}
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| 178 | ^?{}(this.strides);
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| 179 |
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| 180 | for (i; N ) {
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| 181 | ^?{}( (Timmed &)this.strides[N-i-1] );
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| 182 | }
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| 183 | }
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| 184 |
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| 185 |
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| 186 | //
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| 187 | // Sugar for declaring array structure instances
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| 188 | //
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| 189 |
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| 190 | forall( Te * )
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| 191 | static inline Te mkar_( tag(Te) ) {}
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| 192 |
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| 193 | forall( [N], ZTags ... , Trslt &, Tatom & | { Trslt mkar_( tag(Tatom), ZTags ); } )
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| 194 | static inline arpk( N, Trslt, Trslt, Tatom) mkar_( tag(Tatom), tag(N), ZTags ) {}
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| 195 |
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| 196 | // based on https://stackoverflow.com/questions/1872220/is-it-possible-to-iterate-over-arguments-in-variadic-macros
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| 197 |
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| 198 | // Make a FOREACH macro
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| 199 | #define FE_0(WHAT)
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| 200 | #define FE_1(WHAT, X) WHAT(X)
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| 201 | #define FE_2(WHAT, X, ...) WHAT(X)FE_1(WHAT, __VA_ARGS__)
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| 202 | #define FE_3(WHAT, X, ...) WHAT(X)FE_2(WHAT, __VA_ARGS__)
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| 203 | #define FE_4(WHAT, X, ...) WHAT(X)FE_3(WHAT, __VA_ARGS__)
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| 204 | #define FE_5(WHAT, X, ...) WHAT(X)FE_4(WHAT, __VA_ARGS__)
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| 205 | //... repeat as needed
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| 206 |
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| 207 | #define GET_MACRO(_0,_1,_2,_3,_4,_5,NAME,...) NAME
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| 208 | #define FOR_EACH(action,...) \
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| 209 | GET_MACRO(_0,__VA_ARGS__,FE_5,FE_4,FE_3,FE_2,FE_1,FE_0)(action,__VA_ARGS__)
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| 210 |
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| 211 | #define COMMA_ttag(X) , ttag(X)
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| 212 | #define array( TE, ...) typeof( mkar_( ttag(TE) FOR_EACH( COMMA_ttag, __VA_ARGS__ ) ) )
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| 213 |
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| 214 | #define COMMA_ztag(X) , ztag(X)
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| 215 | #define zarray( TE, ...) typeof( mkar_( ttag(TE) FOR_EACH( COMMA_ztag, __VA_ARGS__ ) ) )
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| 216 |
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| 217 | //
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| 218 | // Sugar for multidimensional indexing
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| 219 | //
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| 220 |
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| 221 | // Core -[[-,-,-]] operator
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| 222 |
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| 223 | #ifdef TRY_BROKEN_DESIRED_MD_SUBSCRIPT
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| 224 |
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| 225 | // Desired form. One definition with recursion on IxBC (worked until Jan 2021, see trac #__TODO__)
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| 226 |
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| 227 | forall( TA &, TB &, TC &, IxAB, IxBC ... | { TB & ?[?]( TA &, IxAB ); TC & ?[?]( TB &, IxBC ); } )
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| 228 | static inline TC & ?[?]( TA & this, IxAB ab, IxBC bc ) {
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| 229 | return this[ab][bc];
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| 230 | }
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| 231 |
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| 232 | #else
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| 233 |
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| 234 | // Workaround form. Listing all possibilities up to 4 dims.
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| 235 |
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| 236 | forall( TA &, TB &, TC &, IxAB_0, IxBC | { TB & ?[?]( TA &, IxAB_0 ); TC & ?[?]( TB &, IxBC ); } )
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| 237 | static inline TC & ?[?]( TA & this, IxAB_0 ab, IxBC bc ) {
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| 238 | return this[ab][bc];
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| 239 | }
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| 240 |
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| 241 | forall( TA &, TB &, TC &, IxAB_0, IxAB_1, IxBC | { TB & ?[?]( TA &, IxAB_0, IxAB_1 ); TC & ?[?]( TB &, IxBC ); } )
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| 242 | static inline TC & ?[?]( TA & this, IxAB_0 ab0, IxAB_1 ab1, IxBC bc ) {
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| 243 | return this[[ab0,ab1]][bc];
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| 244 | }
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| 245 |
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| 246 | forall( TA &, TB &, TC &, IxAB_0, IxAB_1, IxAB_2, IxBC | { TB & ?[?]( TA &, IxAB_0, IxAB_1, IxAB_2 ); TC & ?[?]( TB &, IxBC ); } )
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| 247 | static inline TC & ?[?]( TA & this, IxAB_0 ab0, IxAB_1 ab1, IxAB_2 ab2, IxBC bc ) {
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| 248 | return this[[ab0,ab1,ab2]][bc];
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| 249 | }
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| 250 |
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| 251 | #endif
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| 252 |
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| 253 | // Available for users to work around Trac #265
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| 254 | // If `a[...0...]` isn't working, try `a[...ix0...]` instead.
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| 255 |
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| 256 | #define ix0 ((ptrdiff_t)0)
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| 257 |
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| 258 |
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| 259 |
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| 260 | //
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| 261 | // Rotation
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| 262 | //
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| 263 |
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| 264 | // Base
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| 265 | forall( [Nq], Sq & | sized(Sq), Tbase & )
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| 266 | static inline tag(arpk( Nq, Sq, Tbase, Tbase )) enq_( tag(Tbase ), tag(Nq), tag(Sq), tag(Tbase ) ) {
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| 267 | tag(arpk( Nq, Sq, Tbase, Tbase )) ret;
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| 268 | return ret;
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| 269 | }
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| 270 |
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| 271 | // Rec
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| 272 | forall( [Nq], Sq & | sized(Sq), [N], S & | sized(S), recq &, recr &, Tbase & | { tag(recr) enq_( tag(Tbase), tag(Nq), tag(Sq), tag(recq) ); } )
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| 273 | static inline tag(arpk( N, S, recr, Tbase )) enq_( tag(Tbase ), tag(Nq), tag(Sq), tag(arpk( N, S, recq, Tbase )) ) {
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| 274 | tag(arpk( N, S, recr, Tbase )) ret;
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| 275 | return ret;
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| 276 | }
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| 277 |
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| 278 | // Wrapper
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| 279 | extern struct all_t {} all;
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| 280 | forall( [N], S & | sized(S), Te &, result &, Tbase & | { tag(result) enq_( tag(Tbase), tag(N), tag(S), tag(Te) ); } )
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| 281 | static inline result & ?[?]( arpk( N, S, Te, Tbase ) & this, all_t ) {
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| 282 | return (result&) this;
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| 283 | }
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| 284 |
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| 285 | //
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| 286 | // Trait of array or slice
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| 287 | //
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| 288 |
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| 289 | // desired:
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| 290 | // forall(A &, Tv &, [N])
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| 291 | // trait ar {
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| 292 | // Tv& ?[?]( A&, zero_t );
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| 293 | // Tv& ?[?]( A&, one_t );
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| 294 | // Tv& ?[?]( A&, int );
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| 295 | // ...
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| 296 | // size_t ?`len( A& );
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| 297 | // void __taglen( tag(C), tag(N) );
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| 298 | // };
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| 299 |
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| 300 | // working around N's not being accepted as arguments to traits
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| 301 |
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| 302 | #define ar( A, Tv, N ) { \
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| 303 | Tv& ?[?]( A&, zero_t ); \
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| 304 | Tv& ?[?]( A&, one_t ); \
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| 305 | Tv& ?[?]( A&, int ); \
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| 306 | Tv& ?[?]( A&, unsigned int ); \
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| 307 | Tv& ?[?]( A&, long int ); \
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| 308 | Tv& ?[?]( A&, unsigned long int ); \
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| 309 | size_t ?`len( A& ); \
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| 310 | void __taglen( tag(A), tag(N) ); \
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| 311 | }
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