Add comments describing how the FIFO evolves during each test.
Signed-off-by: Philippe Mathieu-Daudé <phi...@linaro.org>
---
tests/unit/test-fifo.c | 188 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 187 insertions(+), 1 deletion(-)
diff --git a/tests/unit/test-fifo.c b/tests/unit/test-fifo.c
index fada526b6c..14153c41fa 100644
--- a/tests/unit/test-fifo.c
+++ b/tests/unit/test-fifo.c
@@ -27,14 +27,36 @@ static void test_fifo8_pop_bufptr_wrap(void)
uint32_t count;
fifo8_create(&fifo, 8);
+ /*
+ * head --v-- tail used = 0
+ * FIFO: [ . . . . . . . . ]
+ */
fifo8_push_all(&fifo, data_in1, sizeof(data_in1));
+ /*
+ * head --v ]-- tail used = 4
+ * FIFO: [ 1 2 3 4 . . . . ]
+ */
buf = fifo8_pop_bufptr(&fifo, 2, &count);
+ /*
+ * head --v ]-- tail used = 2
+ * FIFO: [ 1 2 3 4 . . . . ]
+ * buf --^ count = 2
+ */
g_assert(count == 2);
g_assert(buf[0] == 0x1 && buf[1] == 0x2);
fifo8_push_all(&fifo, data_in2, sizeof(data_in2));
+ /*
+ * tail --]v-- head used = 8
+ * FIFO: [ 9 a 3 4 5 6 7 8 ]
+ */
buf = fifo8_pop_bufptr(&fifo, 8, &count);
+ /*
+ * head --v ]-- tail used = 2
+ * FIFO: [ 9 a 3 4 5 6 7 8 ]
+ * buf --^ count = 6
+ */
g_assert(count == 6);
g_assert(buf[0] == 0x3 && buf[1] == 0x4 && buf[2] == 0x5 &&
buf[3] == 0x6 && buf[4] == 0x7 && buf[5] == 0x8);
@@ -51,9 +73,22 @@ static void test_fifo8_pop_bufptr(void)
uint32_t count;
fifo8_create(&fifo, 8);
+ /*
+ * head --v-- tail used = 0
+ * FIFO: [ . . . . . . . . ]
+ */
fifo8_push_all(&fifo, data_in, sizeof(data_in));
+ /*
+ * head --v ]-- tail used = 4
+ * FIFO: [ 1 2 3 4 . . . . ]
+ */
buf = fifo8_pop_bufptr(&fifo, 2, &count);
+ /*
+ * head --v ]-- tail used = 2
+ * FIFO: [ 1 2 3 4 . . . . ]
+ * buf --^ count = 2
+ */
g_assert(count == 2);
g_assert(buf[0] == 0x1 && buf[1] == 0x2);
@@ -70,18 +105,45 @@ static void test_fifo8_peek_bufptr_wrap(void)
uint32_t count;
fifo8_create(&fifo, 8);
+ /*
+ * head --v-- tail used = 0
+ * FIFO: { . . . . . . . . }
+ */
fifo8_push_all(&fifo, data_in1, sizeof(data_in1));
+ /*
+ * head --v ]-- tail used = 4
+ * FIFO: { 1 2 3 4 . . . . }
+ */
buf = fifo8_peek_bufptr(&fifo, 2, &count);
+ /*
+ * head --v ]-- tail used = 4
+ * FIFO: { 1 2 3 4 . . . . }
+ * buf: [ 1 2 ] count = 2
+ */
g_assert(count == 2);
g_assert(buf[0] == 0x1 && buf[1] == 0x2);
buf = fifo8_pop_bufptr(&fifo, 2, &count);
+ /*
+ * head --v ]-- tail used = 2
+ * FIFO: { 1 2 3 4 . . . . }
+ * buf: [ 1 2 ] count = 2
+ */
g_assert(count == 2);
g_assert(buf[0] == 0x1 && buf[1] == 0x2);
fifo8_push_all(&fifo, data_in2, sizeof(data_in2));
+ /*
+ * tail ---]v-- head used = 8
+ * FIFO: { 9 a 3 4 5 6 7 8 }
+ */
buf = fifo8_peek_bufptr(&fifo, 8, &count);
+ /*
+ * tail --]v-- head used = 8
+ * FIFO: { 9 a 3 4 5 6 7 8 }
+ * buf: [ 3 4 5 6 7 8 ] count = 6
+ */
g_assert(count == 6);
g_assert(buf[0] == 0x3 && buf[1] == 0x4 && buf[2] == 0x5 &&
buf[3] == 0x6 && buf[4] == 0x7 && buf[5] == 0x8);
@@ -98,9 +160,22 @@ static void test_fifo8_peek_bufptr(void)
uint32_t count;
fifo8_create(&fifo, 8);
+ /*
+ * head --v-- tail used = 0
+ * FIFO: { . . . . . . . . }
+ */
fifo8_push_all(&fifo, data_in, sizeof(data_in));
+ /*
+ * head --v ]-- tail used = 4
+ * FIFO: { 1 2 3 4 . . . . }
+ */
buf = fifo8_peek_bufptr(&fifo, 2, &count);
+ /*
+ * head --v ]-- tail used = 4
+ * FIFO: { 1 2 3 4 . . . . }
+ * buf: [ 1 2 ] count = 2
+ */
g_assert(count == 2);
g_assert(buf[0] == 0x1 && buf[1] == 0x2);
@@ -117,14 +192,38 @@ static void test_fifo8_pop_buf_wrap(void)
int count;
fifo8_create(&fifo, 8);
+ /*
+ * head --v-- tail used = 0
+ * FIFO: { . . . . . . . . }
+ */
fifo8_push_all(&fifo, data_in1, sizeof(data_in1));
+ /*
+ * head --v ]-- tail used = 4
+ * FIFO: { 1 2 3 4 . . . . }
+ */
fifo8_pop_buf(&fifo, NULL, 4);
+ /*
+ * tail --]v-- head used = 0
+ * FIFO: [ 1 2 3 4 . . . . ]
+ */
fifo8_push_all(&fifo, data_in2, sizeof(data_in2));
+ /*
+ * tail --]v-- head used = 8
+ * FIFO: { 9 a b c 5 6 7 8 }
+ */
count = fifo8_pop_buf(&fifo, NULL, 4);
+ /*
+ * head --v ]-- tail used = 4
+ * FIFO: { 9 a b c 5 6 7 8 }
+ */
g_assert(count == 4);
count = fifo8_pop_buf(&fifo, data_out, 4);
+ /*
+ * tail --]v-- head used = 0
+ * FIFO: { 9 a b c 5 6 7 8 }
+ */
g_assert(count == 4);
g_assert(data_out[0] == 0x9 && data_out[1] == 0xa &&
data_out[2] == 0xb && data_out[3] == 0xc);
@@ -141,9 +240,21 @@ static void test_fifo8_pop_buf(void)
int count;
fifo8_create(&fifo, 8);
+ /*
+ * head --v-- tail used = 0
+ * FIFO: { . . . . . . . . }
+ */
fifo8_push_all(&fifo, data_in, sizeof(data_in));
+ /*
+ * head --v ]-- tail used = 4
+ * FIFO: { 1 2 3 4 . . . . }
+ */
count = fifo8_pop_buf(&fifo, NULL, 4);
+ /*
+ * tail --]v-- head used = 0
+ * FIFO: { 1 2 3 4 . . . . }
+ */
g_assert(count == 4);
count = fifo8_pop_buf(&fifo, data_out, 4);
g_assert(data_out[0] == 0x5 && data_out[1] == 0x6 &&
@@ -162,19 +273,45 @@ static void test_fifo8_peek_buf_wrap(void)
int count;
fifo8_create(&fifo, 8);
+ /*
+ * head --v-- tail used = 0
+ * FIFO: { . . . . . . . . }
+ */
fifo8_push_all(&fifo, data_in1, sizeof(data_in1));
+ /*
+ * head --v ]-- tail used = 4
+ * FIFO: { 1 2 3 4 . . . . }
+ */
fifo8_pop_buf(&fifo, NULL, 4);
+ /*
+ * tail --]v-- head used = 0
+ * FIFO: { 1 2 3 4 . . . . }
+ */
fifo8_push_all(&fifo, data_in2, sizeof(data_in2));
+ /*
+ * tail --]v-- head used = 8
+ * FIFO: { 9 a b c 5 6 7 8 }
+ */
count = fifo8_peek_buf(&fifo, NULL, 4);
g_assert(count == 4);
count = fifo8_peek_buf(&fifo, data_out, 4);
+ /*
+ * tail --]v-- head used = 8
+ * FIFO: { 9 a b c 5 6 7 8 }
+ * buf: [ 5 6 7 8 ] count = 4
+ */
g_assert(count == 4);
g_assert(data_out[0] == 0x5 && data_out[1] == 0x6 &&
data_out[2] == 0x7 && data_out[3] == 0x8);
count = fifo8_peek_buf(&fifo, data_out, 8);
+ /*
+ * tail --]v-- head used = 8
+ * FIFO: { 9 a b c 5 6 7 8 }
+ * buf: [ 5 6 7 8 9 a b c ] count = 8
+ */
g_assert(count == 8);
g_assert(data_out[0] == 0x5 && data_out[1] == 0x6 &&
data_out[2] == 0x7 && data_out[3] == 0x8);
@@ -193,14 +330,27 @@ static void test_fifo8_peek_buf(void)
int count;
fifo8_create(&fifo, 8);
+ /*
+ * head --v-- tail used = 0
+ * FIFO: { . . . . . . . . }
+ */
fifo8_push_all(&fifo, data_in, sizeof(data_in));
+ /*
+ * head --v ]-- tail used = 4
+ * FIFO: { 1 2 3 4 . . . . }
+ */
count = fifo8_peek_buf(&fifo, NULL, 4);
g_assert(count == 4);
+
g_assert(data_out[0] == 0xff && data_out[1] == 0xff &&
data_out[2] == 0xff && data_out[3] == 0xff);
-
count = fifo8_peek_buf(&fifo, data_out, 4);
+ /*
+ * head --v ]-- tail used = 4
+ * FIFO: { 1 2 3 4 . . . . }
+ * buf: [ 1 2 3 4 ] count = 4
+ */
g_assert(count == 4);
g_assert(data_out[0] == 0x1 && data_out[1] == 0x2 &&
data_out[2] == 0x3 && data_out[3] == 0x4);
@@ -215,12 +365,28 @@ static void test_fifo8_peek(void)
uint8_t c;
fifo8_create(&fifo, 8);
+ /*
+ * head --v-- tail used = 0
+ * FIFO: { . . . . . . . . }
+ */
fifo8_push(&fifo, 0x1);
+ /*
+ * head --v]-- tail used = 1
+ * FIFO: { 1 . . . . . . . }
+ */
fifo8_push(&fifo, 0x2);
+ /*
+ * head --v ]-- tail used = 2
+ * FIFO: { 1 2 . . . . . . }
+ */
c = fifo8_peek(&fifo);
g_assert(c == 0x1);
fifo8_pop(&fifo);
+ /*
+ * head --v]-- tail used = 1
+ * FIFO: { 1 2 . . . . . . }
+ */
c = fifo8_peek(&fifo);
g_assert(c == 0x2);
@@ -234,12 +400,32 @@ static void test_fifo8_pushpop(void)
uint8_t c;
fifo8_create(&fifo, 8);
+ /*
+ * head --v-- tail used = 0
+ * FIFO: { . . . . . . . . }
+ */
fifo8_push(&fifo, 0x1);
+ /*
+ * head --v]-- tail used = 1
+ * FIFO: { 1 . . . . . . . }
+ */
fifo8_push(&fifo, 0x2);
+ /*
+ * head --v ]-- tail used = 2
+ * FIFO: { 1 2 . . . . . . }
+ */
c = fifo8_pop(&fifo);
+ /*
+ * head --v]-- tail used = 1
+ * FIFO: { 1 2 . . . . . . }
+ */
g_assert(c == 0x1);
c = fifo8_pop(&fifo);
+ /*
+ * tail --]v-- head used = 0
+ * FIFO: { 1 2 . . . . . . }
+ */
g_assert(c == 0x2);
g_assert(fifo8_num_used(&fifo) == 0);
