ADTaaron-thesisarm-ehast-experimentalcleanup-dtorsdeferred_resndemanglerenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprnew-envno_listpersistent-indexerpthread-emulationqualifiedEnumwith_gc
Last change
on this file since 2ae16219 was
a5f0529,
checked in by Andrew Beach <ajbeach@…>, 7 years ago
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Virtual casts have been added. They still require a lot of hand coded support to work but for simple cases it should be enough.
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-
Property mode set to
100644
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File size:
1.5 KB
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Rev | Line | |
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[a5f0529] | 1 | // Testing the virtual cast, as part of strict inheritance. |
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| 2 | |
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| 3 | /* IMPORTANT: This test does not repersent the final feature set. |
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| 4 | * We are missing a number of important aspects such as: |
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| 5 | * + vtable type generation. |
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| 6 | * + vtable instance generation, that might use different resolution rules. |
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| 7 | * + Virtual syntax to force said generation on structures and traits. |
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| 8 | * + Trait references/pointers that do the virtual_table lookup. |
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| 9 | */ |
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| 10 | |
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| 11 | #include <stdlib> |
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| 12 | #include <assert.h> |
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| 13 | |
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| 14 | struct alpha_vtable { |
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| 15 | alpha_vtable const * const parent; |
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| 16 | char (*code)(void); |
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| 17 | }; |
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| 18 | |
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| 19 | struct alpha { |
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| 20 | alpha_vtable const * virtual_table; |
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| 21 | }; |
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| 22 | |
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| 23 | char ret_a(void) { |
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| 24 | return 'a'; |
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| 25 | } |
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| 26 | |
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| 27 | |
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| 28 | |
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| 29 | struct beta_vtable { |
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| 30 | alpha_vtable const * const parent; |
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| 31 | char (*code)(void); |
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| 32 | }; |
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| 33 | |
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| 34 | struct beta { |
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| 35 | beta_vtable const * virtual_table; |
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| 36 | }; |
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| 37 | |
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| 38 | char ret_b(void) { |
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| 39 | return 'b'; |
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| 40 | } |
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| 41 | |
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| 42 | |
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| 43 | |
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| 44 | struct gamma_vtable { |
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| 45 | beta_vtable const * const parent; |
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| 46 | char (*code)(void); |
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| 47 | }; |
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| 48 | |
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| 49 | struct gamma { |
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| 50 | gamma_vtable const * virtual_table; |
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| 51 | }; |
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| 52 | |
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| 53 | char ret_g(void) { |
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| 54 | return 'g'; |
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| 55 | } |
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| 56 | |
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| 57 | |
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| 58 | extern "C" { |
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| 59 | alpha_vtable _alpha_vtable_instance = { 0, ret_a }; |
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| 60 | beta_vtable _beta_vtable_instance = { &_alpha_vtable_instance, ret_b }; |
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| 61 | gamma_vtable _gamma_vtable_instance = { &_beta_vtable_instance, ret_g }; |
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| 62 | } |
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| 63 | |
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| 64 | int main (int argc, char * argv[]) { |
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| 65 | |
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| 66 | gamma * tri = malloc(); tri->virtual_table = &_gamma_vtable_instance; |
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| 67 | beta * mid = (virtual beta *)tri; |
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| 68 | assert( 'g' == mid->virtual_table->code() ); |
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| 69 | |
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| 70 | alpha * top = malloc(); top->virtual_table = &_alpha_vtable_instance; |
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| 71 | mid = (virtual beta *)top; |
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| 72 | assert( ! mid ); |
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| 73 | |
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| 74 | free(tri); |
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| 75 | free(top); |
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| 76 | } |
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