Viewing file:  test-accessing-union.c (2.49 KB) -rw-r--r--
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#include <stdlib.h>
#include <stdio.h>
#include "libgccjit.h"
#include "harness.h"
/* Quote from here in docs/topics/types.rst. */
union int_or_float
{
int as_int;
float as_float;
};
void
create_code (gcc_jit_context *ctxt, void *user_data)
{
/* Let's try to inject the equivalent of:
float
test_union (int i)
{
union int_or_float u;
u.as_int = i;
return u.as_float;
}
*/
gcc_jit_type *int_type =
gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_INT);
gcc_jit_type *float_type =
gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_FLOAT);
gcc_jit_field *as_int =
gcc_jit_context_new_field (ctxt,
NULL,
int_type,
"as_int");
gcc_jit_field *as_float =
gcc_jit_context_new_field (ctxt,
NULL,
float_type,
"as_float");
gcc_jit_field *fields[] = {as_int, as_float};
gcc_jit_type *union_type =
gcc_jit_context_new_union_type (ctxt, NULL,
"int_or_float", 2, fields);
/* Build the test function. */
gcc_jit_param *param_i =
gcc_jit_context_new_param (ctxt, NULL, int_type, "i");
gcc_jit_function *test_fn =
gcc_jit_context_new_function (ctxt, NULL,
GCC_JIT_FUNCTION_EXPORTED,
float_type,
"test_union",
1, ¶m_i,
0);
gcc_jit_lvalue *u =
gcc_jit_function_new_local (test_fn, NULL,
union_type, "u");
gcc_jit_block *block = gcc_jit_function_new_block (test_fn, NULL);
/* u.as_int = i; */
gcc_jit_block_add_assignment (
block,
NULL,
/* "u.as_int = ..." */
gcc_jit_lvalue_access_field (u,
NULL,
as_int),
gcc_jit_param_as_rvalue (param_i));
/* return u.as_float; */
gcc_jit_block_end_with_return (
block, NULL,
gcc_jit_rvalue_access_field (gcc_jit_lvalue_as_rvalue (u),
NULL,
as_float));
}
/* Quote up to here in docs/topics/types.rst. */
void
verify_code (gcc_jit_context *ctxt, gcc_jit_result *result)
{
typedef float (*fn_type) (int i);
CHECK_NON_NULL (result);
fn_type test_union =
(fn_type)gcc_jit_result_get_code (result, "test_union");
CHECK_NON_NULL (test_union);
/* Call the JIT-generated function. */
float f_result = test_union (42);
union int_or_float u;
u.as_float = f_result;
CHECK_VALUE (u.as_int, 42);
}
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