source: src/tests/designations.c @ 2463d0e

//
// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// designations.c --
//
// Author           : Rob Schluntz
// Created On       : Thu Jun 29 15:26:36 2017
// Last Modified By : Rob Schluntz
// Last Modified On : Thu Jun 29 15:27:05 2017
// Update Count     : 2
//

// Note: this test case has been crafted so that it compiles with both cfa and with gcc without any modifications.
// In particular, since the syntax for designations in Cforall differs from that of C, preprocessor substitution
// is used for the designation syntax
#ifdef __CFORALL__
#define DES :
#else
int printf(const char *, ...);
#define DES =
#endif

const int indentAmt = 2;
void indent(int level) {
        for (int i = 0; i < level; ++i) {
                printf(" ");
        }
}

// A contains fields with different types (int vs. int *)
struct A {
        int x, y;
        int * ptr;
};
void printA(struct A a, int level) {
        indent(level);
        printf("(A){ %d %d %p }\n", a.x, a.y, a.ptr);
}

// B contains struct members
struct B {
        struct A a0, a1;
};
void printB(struct B b, int level) {
        indent(level);
        printf("(B){\n");
        printA(b.a0, level+indentAmt);
        printA(b.a1, level+indentAmt);
        indent(level);
        printf("}\n");
}

// C contains an array - tests that after 3 ints, the members of B are initialized.
struct C {
        int arr[3];
        struct B b;
};
void printC(struct C c, int level) {
        indent(level);
        printf("(C){\n");
        indent(level+indentAmt);
        printf("(int[]{ %d %d %d }\n", c.arr[0], c.arr[1], c.arr[2]);
        printB(c.b, level+indentAmt);
        indent(level);
        printf("}\n");
}

// D contains an unnamed aggregate - tests that this doesn't interfere with initialization.
struct D {
        struct {
                int x;
        };
};
void printD(struct D d, int level) {
        indent(level);
        printf("(D){ %d }\n", d.x);
}

// E tests unions
union E {
        struct A a;
        struct B b;
        struct C c;
        struct D d;
        int i;
};

int main() {
        // simple designation case - starting from beginning of structure, leaves ptr default-initialized (zero)
        struct A y0 = {
                .x DES 2,
                .y DES 3
        };

        // simple initializaiton case - initialize all elements explicitly with no designations
        struct A y1 = {
                2, 3, 0
        };


        // use designation to move to member y, leaving x default-initialized (zero)
        struct A y2 = {
                .y DES 3,
                0
        };

#if ERROR
        struct A yErr0 = {
                {} // error - empty scalar initializer is illegal
        };
#endif

        printf("=====A=====\n");
        printA(y0, 0);
        printA(y1, 0);
        printA(y2, 0);
        printf("=====A=====\n\n");

        // initialize only first element (z0.a.x), leaving everything else default-initialized (zero), no nested curly-braces
        struct B z0 = { 5 };

        // some nested curly braces, use designation to 'jump around' within structure, leaving some members default-initialized
        struct B z1 = {
                { 3 }, // z1.a0
                { 4 }, // z1.a1
                .a0 DES { 5 }, // z1.a0
                { 6 }, // z1.a1
                .a0.y DES 2, // z1.a0.y
                0, // z1.a0.ptr
        };

        // z2.a0.y and z2.a0.ptr default-initialized, everything else explicit
        struct B z2 = {
                { 1 },
                { 2, 3, 0 }
        };

        // initialize every member, omitting nested curly braces
        struct B z3 = {
                1, 2, 0, 4, 5, 0
        };

        // no initializer - legal C, but garbage values - don't print this one
        struct B z4;

        // no curly braces - initialize with object of same type
        struct B z5 = z2;

        // z6.a0.y and z6.a0.ptr default-initialized, everything else explicit.
        // no curly braces on z6.a1 initializers
        struct B z6 = {
                { 1 },
                2, 3, 0
        };

        printf("=====B=====\n");
        printB(z0, 0);
        printB(z1, 0);
        printB(z2, 0);
        printB(z3, 0);
        printB(z5, 0);
        printB(z6, 0);
        printf("=====B=====\n\n");

        // TODO: what about extra things in a nested init? are empty structs skipped??

        // test that initializing 'past array bound' correctly moves to next member.
        struct C c1 = {
                2, 3, 4,  // arr
                5, 6, 0,  // b.a0
                7, 8, 0,  // b.a1
        };

        printf("=====C=====\n");
        printC(c1, 0);
        printf("=====C=====\n\n");

#if ERROR
        // nested initializer can't refer to same type in C
        struct C cErr0 = { c1 };

        // must use curly braces to initialize members
        struct C cErr1 = 2;

        // can't initialize with array compound literal
        struct C cErr2 = {
                (int[3]) { 1, 2, 3 }  // error: array initialized from non-constant array expression
        };
#endif

#if WARNING
        // can't initialize array with array - converts to int*
        int cWarn0_arr[3] = { 1, 2, 3 };
        struct C cWarn0 = {
                cWarn0_arr  // warning: initialization makes integer from ptr without cast
        };
#endif

        // allowed to have 'too many' initialized lists - essentially they are ignored.
        int i1 = { 3 };

        // doesn't work yet.
        // designate unnamed object's members
        // struct D d = { .x DES 3 };
#if ERROR
        struct D d1 = { .y DES 3 };
#endif

        // simple union initialization - initialized first member (e0.a)
        union E e0 = {
                y0
        };

        // simple union initialization - initializes first member (e1.a) - with nested initializer list
        union E e1 = {
                { 2, 3, 0 }
        };

        // simple union initialization - initializes first member (e2.a) - without nested initializer list
        union E e2 = {
                2, 3, 0
        };

        // move cursor to e4.b.a0.x and initialize until e3.b.a1.ptr inclusive
        union E e3 = {
                .b.a0.x DES 2, 3, 0, 5, 6, 0
        };

        printf("=====E=====\n");
        printA(e0.a, 0);
        printA(e1.a, 0);
        printA(e2.a, 0);
        printB(e3.b, 0);
        printf("=====E=====\n\n");

        // special case of initialization: char[] can be initialized with a string literal
        const char * str0 = "hello";
        char str1[] = "hello";
}

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