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|
// This file tests the various forms of switch statement.
//
// We must be extra sensitive to the fact that switch fallthrough is handled
// differently in C and Go. Break statements are removed and fallthrough
// statements are added when necessary.
//
// It is worth mentioning that a SwitchStmt has a CompoundStmt item that
// contains all of the cases. However, if the individual case are not enclosed
// in a scope each of the case statements and their childen are part of the same
// CompoundStmt. For example, the first switch statement below contains a
// CompoundStmt with 12 children.
#include <stdio.h>
#include <stdbool.h>
#include "tests.h"
void match_a_single_case()
{
switch (1)
{
case 0:
fail("code should not reach here");
break;
case 1:
pass(__func__);
break;
case 2:
fail("code should not reach here");
break;
default:
fail("code should not reach here");
break;
}
}
void fallthrough_to_next_case()
{
switch (1)
{
case 0:
fail("code should not reach here");
break;
case 1:
pass(__func__);
case 2:
pass(__func__);
break;
default:
fail("code should not reach here");
break;
}
}
void match_no_cases()
{
switch (1)
{
case 5:
fail("code should not reach here");
break;
case 2:
fail("code should not reach here");
break;
}
}
void match_default()
{
switch (1)
{
case 5:
fail("code should not reach here");
break;
case 2:
fail("code should not reach here");
break;
default:
pass(__func__);
break;
}
}
void fallthrough_several_cases_including_default()
{
switch (1)
{
case 0:
fail("code should not reach here");
case 1:
pass(__func__);
case 2:
pass(__func__);
default:
pass(__func__);
}
}
void fallthrough_several_midway_default()
{
for(int i=0; i<=3; i++) {
int j = -1;
int expected = -1;
if(i==0)
expected = 10;
if(i==1)
expected = 21;
if(i==2)
expected = 22;
if(i==3)
expected = 13;
if(i==4)
expected = 666;
switch(i) {
case 4:
fail("code should not reach here");
case 0:
default:
j = i+10;
break;
case 1:
case 2:
j = i+20;
break;
}
is_eq(j, expected);
}
}
void goto_label(bool use_goto)
{
for (;;) {
switch (0)
{
case 3:
continue;
case 0:
if (use_goto) {
for (;;)
break;
goto LABEL;
fail("code should not reach here");
} else if (false) {
goto LABELX;
goto LABELY;
fail("code should not reach here");
}
/* other comment */
// some comment
/* fallthrough */
LABELY:
case 4:
LABEL:
printf("x");
case 1:
pass(__func__);
break;
case 2:
;
LABELX:
default:
fail("code should not reach here");
break;
}
break;
}
}
void scoped_match_a_single_case()
{
switch (1)
{
case 0:
{
fail("code should not reach here");
break;
}
case 1:
{
pass(__func__);
break;
}
case 2:
{
fail("code should not reach here");
break;
}
default:
{
fail("code should not reach here");
break;
}
}
}
void scoped_fallthrough_to_next_case()
{
switch (1)
{
case 0:
{
fail("code should not reach here");
break;
}
case 1:
{
pass(__func__);
}
case 2:
{
pass(__func__);
break;
}
default:
{
fail("code should not reach here");
break;
}
}
}
void scoped_match_no_cases()
{
switch (1)
{
case 5:
{
fail("code should not reach here");
break;
}
case 2:
{
fail("code should not reach here");
break;
}
}
}
void scoped_match_default()
{
switch (1)
{
case 5:
{
fail("code should not reach here");
break;
}
case 2:
{
fail("code should not reach here");
break;
}
default:
{
pass(__func__);
break;
}
}
}
void scoped_fallthrough_several_cases_including_default()
{
switch (1)
{
case 0:
{
fail("code should not reach here");
}
case 1:
{
pass(__func__);
}
case 2:
{
pass(__func__);
}
default:
{
pass(__func__);
}
}
}
void scoped_fallthrough_several_midway_default()
{
for(int i=0; i<=3; i++) {
int j = -1;
int expected = -1;
if(i==0)
expected = 10;
if(i==1)
expected = 21;
if(i==2)
expected = 22;
if(i==3)
expected = 13;
if(i==4)
expected = 666;
switch(i) {
case 4:
{
fail("code should not reach here");
}
case 0:
{}
default:
{
j = i+10;
break;
}
case 1:
{}
case 2:
{
j = i+20;
}
}
is_eq(j, expected);
}
}
void scoped_goto_label(bool use_goto)
{
for (;;) {
switch (0)
{
case 3:
{
continue;
}
case 0:
{
if (use_goto) {
for (;;) {
break;
}
goto LABEL;
fail("code should not reach here");
} else if (false) {
goto LABELX;
goto LABELY;
fail("code should not reach here");
}
/* other comment */
// some comment
/* fallthrough */
}
LABELY: {}
case 4: {}
LABEL:
{
printf("x");
}
case 1:
{
pass(__func__);
break;
}
case 2:
{
int x = 0;
printf("%d", x);
break;
}
LABELX: {}
default:
{
fail("code should not reach here");
break;
}
}
break;
}
}
typedef struct I67 I67;
struct I67{
int x,y;
};
void run( I67 * i ,int pos)
{
switch (pos) {
case 0:
(*i).x += 1;
(*i).y += 1;
break;
case 1:
(*i).x -= 1;
(*i).y -= 1;
break;
}
}
void run_with_block( I67 * i ,int pos)
{
switch (pos) {
case 0:
{
(*i).x += 1;
(*i).y += 1;
break;
}
case 1:
{
(*i).x -= 1;
(*i).y -= 1;
}
break;
case 2:
(*i).x *= 1;
(*i).y *= 1;
break;
default:
(*i).x *= 10;
(*i).y *= 10;
}
}
void switch_issue67()
{
I67 i;
i.x = 0;
i.y = 0;
run(&i, 0);
is_eq(i.x, 1);
is_eq(i.y, 1);
run(&i, 1);
is_eq(i.x, 0);
is_eq(i.y, 0);
run_with_block(&i,0);
is_eq(i.x, 1);
is_eq(i.y, 1);
run_with_block(&i, 1);
is_eq(i.x, 0);
is_eq(i.y, 0);
}
void empty_switch()
{
int pos = 0;
switch (pos){
}
is_eq(pos,0);
}
void default_only_switch()
{
int pos = 0;
switch (pos){
case -1: // empty case
case -1-4: // empty case
case (-1-4-4): // empty case
case (-3): // empty case
case -2: // empty case
default:
pos++;
}
is_eq(pos,1);
}
void switch_without_input()
{
int pos = 0;
switch (0){
default:
pos++;
}
is_eq(pos,1);
}
int main()
{
plan(37);
match_a_single_case();
fallthrough_to_next_case();
match_no_cases();
match_default();
fallthrough_several_cases_including_default();
fallthrough_several_midway_default();
goto_label(false);
goto_label(true);
// For each of the tests above there will be identical cases that use scopes
// for the case statements.
scoped_match_a_single_case();
scoped_fallthrough_to_next_case();
scoped_match_no_cases();
scoped_match_default();
scoped_fallthrough_several_cases_including_default();
scoped_fallthrough_several_midway_default();
scoped_goto_label(false);
scoped_goto_label(true);
switch_issue67();
empty_switch();
default_only_switch();
switch_without_input();
done_testing();
}
|
