[aabc60c] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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| 7 | // polymorphism.c -- |
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| 8 | // |
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| 9 | // Author : Rob Schluntz |
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| 10 | // Created On : Tue Oct 17 12:19:48 2017 |
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| 11 | // Last Modified By : Rob Schluntz |
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| 12 | // Last Modified On : Tue Oct 17 12:21:07 2017 |
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| 13 | // Update Count : 1 |
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| 14 | // |
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| 15 | |
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[3787dc1] | 16 | #include <assert.h> |
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| 17 | #include <inttypes.h> |
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| 18 | |
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[aabc60c] | 19 | forall(otype T) |
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| 20 | T f(T x, T y) { |
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[598f50e] | 21 | x = y; |
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| 22 | return x; |
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| 23 | } |
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| 24 | |
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| 25 | forall(otype T) T ident(T x) { |
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| 26 | return x; |
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[aabc60c] | 27 | } |
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| 28 | |
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[3787dc1] | 29 | forall( otype T, otype U ) |
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| 30 | size_t struct_size( T i, U j ) { |
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| 31 | struct S { T i; U j; }; |
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| 32 | return sizeof(S); |
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| 33 | } |
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| 34 | |
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| 35 | forall( otype T, otype U ) |
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| 36 | size_t union_size( T i, U j ) { |
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| 37 | union B { T i; U j; }; |
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| 38 | return sizeof(B); |
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| 39 | } |
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| 40 | |
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| 41 | // perform some simple operations on aggregates of T and U |
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| 42 | forall( otype T | { void print(T); int ?==?(T, T); }, otype U | { void print(U); U ?=?(U&, zero_t); } ) |
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| 43 | U foo(T i, U j) { |
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| 44 | struct S { T i; U j; }; |
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| 45 | union B { T i; U j; }; |
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| 46 | |
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| 47 | S s; |
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| 48 | s.i = i; |
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| 49 | assert(s.i == i); |
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| 50 | |
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| 51 | B b; |
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| 52 | b.j = 0; |
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| 53 | b.i = s.i; |
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| 54 | return b.j; |
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| 55 | } |
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| 56 | |
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[aabc60c] | 57 | int main() { |
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[3787dc1] | 58 | { |
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| 59 | // ensure that x is not changed by the invocation of a polymorphic function |
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| 60 | int x = 123; |
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| 61 | int y = 456; |
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| 62 | int z = f(x, y); |
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| 63 | printf("%d %d %d\n", x, y, z); |
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| 64 | } |
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| 65 | |
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| 66 | { |
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| 67 | // explicitly specialize function |
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| 68 | int (*f)(int) = ident; |
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| 69 | ((int(*)(int))ident); |
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| 70 | printf("%d %d\n", f(5), ((int(*)(int))ident)(5)); |
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| 71 | } |
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| 72 | |
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| 73 | { |
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| 74 | // test aggregates with polymorphic members |
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| 75 | typedef uint32_t x_type; |
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| 76 | typedef uint64_t y_type; |
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| 77 | |
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| 78 | x_type x = 3; |
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| 79 | y_type y = 3; |
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| 80 | |
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| 81 | struct S { |
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| 82 | x_type f1; |
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| 83 | y_type f2; |
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| 84 | }; |
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| 85 | union U { |
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| 86 | x_type f1; |
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| 87 | y_type f2; |
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| 88 | }; |
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| 89 | // ensure that the size of aggregates with polymorphic members |
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| 90 | // matches the size of the aggregates in a monomorphic context |
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| 91 | assert( struct_size(x, y) == sizeof(S) ); |
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| 92 | assert( union_size(x, y) == sizeof(U) ); |
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| 93 | |
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| 94 | y_type ?=?(y_type & this, zero_t) { |
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| 95 | this = (int)0; |
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| 96 | return this; |
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| 97 | } |
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| 98 | |
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| 99 | void print(x_type x) { |
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| 100 | printf("%"PRIu32"\n", x); |
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| 101 | } |
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| 102 | |
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| 103 | void print(y_type y) { |
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| 104 | printf("%"PRIu64"\n", y); |
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| 105 | } |
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| 106 | |
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| 107 | y_type ret = foo(x, y); |
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| 108 | |
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| 109 | // duplicate logic from inside of foo to ensure the same results |
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| 110 | U u; |
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| 111 | u.f2 = 0; |
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| 112 | u.f1 = x; |
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| 113 | assert(ret == u.f2); |
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| 114 | } |
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[aabc60c] | 115 | } |
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| 116 | |
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| 117 | // Local Variables: // |
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| 118 | // tab-width: 4 // |
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| 119 | // End: // |
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