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/* Test of C++ API. */
#include <stdlib.h>
#include <stdio.h>
#include "libgccjit++.h"
#include <sstream>
#include "harness.h"
struct quadratic
{
double a;
double b;
double c;
double discriminant;
};
/* As per test-quadratic.c, let's try to inject the equivalent of:
extern double sqrt (double);
void
calc_discriminant (struct quadratic *q)
{
// (b^2 - 4ac)
q->discriminant = (q->b * q->b) - (4 * q->a * q->c);
}
int
test_quadratic (double a, double b, double c, double *r1, double *r2)
{
struct quadratic q;
q.a = a;
q.b = b;
q.c = c;
calc_discriminant (&q);
if (q.discriminant > 0)
{
double s = sqrt (q.discriminant);
*r1 = (-b + s) / (2 * a);
*r2 = (-b - s) / (2 * a);
return 2;
}
else if (q.discriminant == 0)
{
*r1 = -b / (2 * a);
return 1;
}
else return 0;
}
However, we'll use the C++ bindings.
*/
/****************************************************************************
Test case
****************************************************************************/
struct quadratic_test
{
gccjit::context ctxt;
/* "double" and "(double *)". */
gccjit::type numeric_type;
gccjit::type numeric_type_ptr;
/* The value (double)0. */
gccjit::rvalue zero;
gccjit::type int_type;
gccjit::type void_type;
/* "struct quadratic" */
gccjit::type quadratic;
gccjit::field a;
gccjit::field b;
gccjit::field c;
gccjit::field discriminant;
/* "(struct quadratic *)" */
gccjit::type quadratic_ptr;
gccjit::function calc_discriminant;
gccjit::function sqrt;
};
static void
make_types (quadratic_test &testcase)
{
testcase.numeric_type = testcase.ctxt.get_type (GCC_JIT_TYPE_DOUBLE);
testcase.numeric_type_ptr = testcase.numeric_type.get_pointer ();
testcase.zero = testcase.ctxt.zero (testcase.numeric_type);
testcase.int_type = testcase.ctxt.get_int_type <int> ();
testcase.void_type = testcase.ctxt.get_type (GCC_JIT_TYPE_VOID);
testcase.a = testcase.ctxt.new_field (testcase.numeric_type, "a");
testcase.b = testcase.ctxt.new_field (testcase.numeric_type, "b");
testcase.c = testcase.ctxt.new_field (testcase.numeric_type, "c");
testcase.discriminant =
testcase.ctxt.new_field (testcase.numeric_type, "discriminant");
CHECK_STRING_VALUE (testcase.discriminant.get_debug_string ().c_str (),
"discriminant");
std::vector<gccjit::field> fields (4);
fields[0] = testcase.a;
fields[1] = testcase.b;
fields[2] = testcase.c;
fields[3] = testcase.discriminant;
testcase.quadratic =
testcase.ctxt.new_struct_type (
"quadratic",
fields);
testcase.quadratic_ptr = testcase.quadratic.get_pointer ();
}
static void
make_sqrt (quadratic_test &testcase)
{
std::vector<gccjit::param> params (1);
params[0] =
testcase.ctxt.new_param (testcase.numeric_type, "x");
testcase.sqrt =
testcase.ctxt.new_function (GCC_JIT_FUNCTION_IMPORTED,
testcase.numeric_type,
"sqrt",
params,
0);
}
static void
make_calc_discriminant (quadratic_test &testcase)
{
/* Build "calc_discriminant". */
gccjit::param param_q =
testcase.ctxt.new_param (testcase.quadratic_ptr, "q");
std::vector <gccjit::param> params (1);
params[0] = param_q;
testcase.calc_discriminant =
testcase.ctxt.new_function (GCC_JIT_FUNCTION_EXPORTED,
testcase.void_type,
"calc_discriminant",
params,
0);
gccjit::block block = testcase.calc_discriminant.new_block ();
block.add_comment ("(b^2 - 4ac)");
gccjit::rvalue q_a = param_q.dereference_field (testcase.a);
gccjit::rvalue q_b = param_q.dereference_field (testcase.b);
gccjit::rvalue q_c = param_q.dereference_field (testcase.c);
block.add_assignment (
/* q->discriminant =... */
param_q.dereference_field (testcase.discriminant),
/* (q->b * q->b) - (4 * q->a * q->c) */
testcase.ctxt.new_minus (
testcase.numeric_type,
/* (q->b * q->b) */
testcase.ctxt.new_mult (
testcase.numeric_type,
q_b, q_b),
/* (4 * (q->a * q->c)) */
testcase.ctxt.new_mult (
testcase.numeric_type,
/* 4.0 */
testcase.ctxt.new_rvalue (
testcase.numeric_type,
4),
/* (q->a * q->c) */
testcase.ctxt.new_mult (
testcase.numeric_type,
q_a, q_c)))); /* end of add_assignment call. */
block.end_with_return ();
}
static void
make_test_quadratic (quadratic_test &testcase)
{
gccjit::param a = testcase.ctxt.new_param (testcase.numeric_type, "a");
gccjit::param b = testcase.ctxt.new_param (testcase.numeric_type, "b");
gccjit::param c = testcase.ctxt.new_param (testcase.numeric_type, "c");
gccjit::param r1 =
testcase.ctxt.new_param (testcase.numeric_type_ptr, "r1");
gccjit::param r2 =
testcase.ctxt.new_param (testcase.numeric_type_ptr, "r2");
std::vector<gccjit::param> params (5);
params[0] = a;
params[1] = b;
params[2] = c;
params[3] = r1;
params[4] = r2;
gccjit::function test_quadratic =
testcase.ctxt.new_function (GCC_JIT_FUNCTION_EXPORTED,
testcase.int_type,
"test_quadratic",
params,
0);
/* struct quadratic q; */
gccjit::lvalue q = test_quadratic.new_local (testcase.quadratic, "q");
gccjit::block initial = test_quadratic.new_block ("initial");
gccjit::block on_positive_discriminant
= test_quadratic.new_block ("positive_discriminant");
gccjit::block on_nonpositive_discriminant
= test_quadratic.new_block ("nonpositive_discriminant");
gccjit::block on_zero_discriminant
= test_quadratic.new_block ("zero_discriminant");
gccjit::block on_negative_discriminant
= test_quadratic.new_block ("negative_discriminant");
CHECK_STRING_VALUE (on_zero_discriminant.get_debug_string ().c_str (),
"zero_discriminant");
/* q.a = a; */
initial.add_assignment (q.access_field (testcase.a), a);
/* q.b = b; */
initial.add_assignment (q.access_field (testcase.b), b);
/* q.c = c; */
initial.add_assignment (q.access_field (testcase.c), c);
/* calc_discriminant (&q); */
gccjit::rvalue address_of_q = q.get_address ();
initial.add_call (testcase.calc_discriminant, address_of_q);
initial.add_comment ("if (q.discriminant > 0)");
initial.end_with_conditional (
testcase.ctxt.new_gt (
q.access_field (testcase.discriminant),
testcase.zero),
on_positive_discriminant,
on_nonpositive_discriminant);
/* Block: "on_positive_discriminant" */
/* double s = sqrt (q.discriminant); */
gccjit::lvalue s = test_quadratic.new_local (testcase.numeric_type, "s");
gccjit::rvalue discriminant_of_q = q.access_field (testcase.discriminant);
on_positive_discriminant.add_assignment (
s,
testcase.ctxt.new_call (testcase.sqrt, discriminant_of_q));
gccjit::rvalue minus_b =
testcase.ctxt.new_minus (
testcase.numeric_type,
b);
gccjit::rvalue two_a =
testcase.ctxt.new_mult (
testcase.numeric_type,
testcase.ctxt.new_rvalue (testcase.numeric_type, 2),
a);
CHECK_STRING_VALUE (two_a.get_debug_string ().c_str (),
"(double)2 * a");
on_positive_discriminant.add_comment ("*r1 = (-b + s) / (2 * a);");
on_positive_discriminant.add_assignment (
/* "*r1 = ..." */
r1.dereference (),
/* (-b + s) / (2 * a) */
testcase.ctxt.new_divide (
testcase.numeric_type,
testcase.ctxt.new_plus (
testcase.numeric_type,
minus_b,
s),
two_a));
on_positive_discriminant.add_comment ("*r2 = (-b - s) / (2 * a)");
on_positive_discriminant.add_assignment (
/* "*r2 = ..." */
r2.dereference (),
/* (-b - s) / (2 * a) */
testcase.ctxt.new_divide (
testcase.numeric_type,
testcase.ctxt.new_minus (
testcase.numeric_type,
minus_b,
s),
two_a));
/* "return 2;" */
on_positive_discriminant.end_with_return (
testcase.ctxt.new_rvalue (testcase.int_type, 2));
/* Block: "on_nonpositive_discriminant" */
on_nonpositive_discriminant.add_comment ("else if (q.discriminant == 0)");
on_nonpositive_discriminant.end_with_conditional (
testcase.ctxt.new_eq (
q.access_field (testcase.discriminant),
testcase.zero),
on_zero_discriminant,
on_negative_discriminant);
/* Block: "on_zero_discriminant" */
/* if (q.discriminant == 0) */
on_zero_discriminant.add_comment ("*r1 = -b / (2 * a);");
on_zero_discriminant.add_assignment (
/* "*r1 = ..." */
r1.dereference (),
/* -b / (2 * a) */
testcase.ctxt.new_divide (
testcase.numeric_type,
minus_b,
two_a));
/* "return 1;" */
on_zero_discriminant.end_with_return (
testcase.ctxt.one (testcase.int_type));
/* Block: "on_negative_discriminant" */
/* else return 0; */
on_negative_discriminant.end_with_return (
testcase.ctxt.zero (testcase.int_type));
/* Verify that output stream operator << works. */
std::ostringstream os;
os << "streamed output: " << address_of_q;
CHECK_STRING_VALUE (os.str ().c_str (), "streamed output: &q");
}
void
create_code (gcc_jit_context *ctxt, void *user_data)
{
struct quadratic_test testcase = {};
testcase.ctxt = ctxt;
make_types (testcase);
make_sqrt (testcase);
make_calc_discriminant (testcase);
make_test_quadratic (testcase);
}
void
verify_code (gcc_jit_context *ctxt, gcc_jit_result *result)
{
typedef int (*fn_type) (double a, double b, double c,
double *r1, double *r2);
CHECK_NON_NULL (result);
fn_type test_quadratic =
(fn_type)gcc_jit_result_get_code (result, "test_quadratic");
CHECK_NON_NULL (test_quadratic);
/* Verify that the code correctly solves quadratic equations. */
double r1, r2;
/* This one has two solutions: */
CHECK_VALUE (test_quadratic (1, 3, -4, &r1, &r2), 2);
CHECK_VALUE (r1, 1);
CHECK_VALUE (r2, -4);
/* This one has one solution: */
CHECK_VALUE (test_quadratic (4, 4, 1, &r1, &r2), 1);
CHECK_VALUE (r1, -0.5);
/* This one has no real solutions: */
CHECK_VALUE (test_quadratic (4, 1, 1, &r1, &r2), 0);
}
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