glsl: Add unit tests for blob.c

In addition to exercising all of the functions in blob.h, this
includes a stress test that forces some reallocing, and also tests to
verify the alignment and overrun-detection code in blob.c.

1 files changed, 320 insertions, 0 deletions

diff --git a/src/glsl/tests/blob_test.c b/src/glsl/tests/blob_test.c
new file mode 100644
index 00000000000..4806029bca6
--- /dev/null
+++ b/src/glsl/tests/blob_test.c
@@ -0,0 +1,320 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/* A collection of unit tests for blob.c */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+
+#include "util/ralloc.h"
+#include "blob.h"
+
+#define bytes_test_str     "bytes_test"
+#define reserve_test_str   "reserve_test"
+
+/* This placeholder must be the same length as the next overwrite_test_str */
+#define placeholder_str    "XXXXXXXXXXXXXX"
+#define overwrite_test_str "overwrite_test"
+#define uint32_test        0x12345678
+#define uint32_placeholder 0xDEADBEEF
+#define uint32_overwrite   0xA1B2C3D4
+#define uint64_test        0x1234567890ABCDEF
+#define string_test_str    "string_test"
+
+bool error = false;
+
+static void
+expect_equal(uint64_t expected, uint64_t actual, const char *test)
+{
+   if (actual != expected) {
+      fprintf (stderr, "Error: Test '%s' failed: Expected=%ld, Actual=%ld\n",
+               test, expected, actual);
+      error = true;
+   }
+}
+
+static void
+expect_unequal(uint64_t expected, uint64_t actual, const char *test)
+{
+   if (actual == expected) {
+      fprintf (stderr, "Error: Test '%s' failed: Result=%ld, but expected something different.\n",
+               test, actual);
+      error = true;
+   }
+}
+
+static void
+expect_equal_str(const char *expected, const char *actual, const char *test)
+{
+   if (strcmp(expected, actual)) {
+      fprintf (stderr, "Error: Test '%s' failed:\n\t"
+               "Expected=\"%s\", Actual=\"%s\"\n",
+               test, expected, actual);
+      error = true;
+   }
+}
+
+static void
+expect_equal_bytes(uint8_t *expected, uint8_t *actual,
+                   size_t num_bytes, const char *test)
+{
+   size_t i;
+
+   if (memcmp(expected, actual, num_bytes)) {
+      fprintf (stderr, "Error: Test '%s' failed:\n\t", test);
+
+      fprintf (stderr, "Expected=[");
+      for (i = 0; i < num_bytes; i++) {
+         if (i != 0)
+            fprintf(stderr, ", ");
+         fprintf(stderr, "0x%02x", expected[i]);
+      }
+      fprintf (stderr, "]");
+
+      fprintf (stderr, "Actual=[");
+      for (i = 0; i < num_bytes; i++) {
+         if (i != 0)
+            fprintf(stderr, ", ");
+         fprintf(stderr, "0x%02x", actual[i]);
+      }
+      fprintf (stderr, "]\n");
+
+      error = true;
+   }
+}
+
+/* Test at least one call of each blob_write_foo and blob_read_foo function,
+ * verifying that we read out everything we wrote, that every bytes is
+ * consumed, and that the overrun bit is not set.
+ */
+static void
+test_write_and_read_functions (void)
+{
+   void *ctx = ralloc_context(NULL);
+   struct blob *blob;
+   struct blob_reader reader;
+   uint8_t *reserved;
+   size_t str_offset, uint_offset;
+   uint8_t reserve_buf[sizeof(reserve_test_str)];
+
+   blob = blob_create(ctx);
+
+   /*** Test blob by writing one of every possible kind of value. */
+
+   blob_write_bytes(blob, bytes_test_str, sizeof(bytes_test_str));
+
+   reserved = blob_reserve_bytes(blob, sizeof(reserve_test_str));
+   memcpy(reserved, reserve_test_str, sizeof(reserve_test_str));
+
+   /* Write a placeholder, (to be replaced later via overwrite_bytes) */
+   str_offset = blob->size;
+   blob_write_bytes(blob, placeholder_str, sizeof(placeholder_str));
+
+   blob_write_uint32(blob, uint32_test);
+
+   /* Write a placeholder, (to be replaced later via overwrite_uint32) */
+   uint_offset = blob->size;
+   blob_write_uint32(blob, uint32_placeholder);
+
+   blob_write_uint64(blob, uint64_test);
+
+   blob_write_intptr(blob, (intptr_t) blob);
+
+   blob_write_string(blob, string_test_str);
+
+   /* Finally, overwrite our placeholders. */
+   blob_overwrite_bytes(blob, str_offset, overwrite_test_str,
+                        sizeof(overwrite_test_str));
+   blob_overwrite_uint32(blob, uint_offset, uint32_overwrite);
+
+   /*** Now read each value and verify. */
+   blob_reader_init(&reader, blob->data, blob->size);
+
+   expect_equal_str(bytes_test_str,
+                    blob_read_bytes(&reader, sizeof(bytes_test_str)),
+                    "blob_write/read_bytes");
+
+   blob_copy_bytes(&reader, reserve_buf, sizeof(reserve_buf));
+   expect_equal_str(reserve_test_str, (char *) reserve_buf,
+                    "blob_reserve_bytes/blob_copy_bytes");
+
+   expect_equal_str(overwrite_test_str,
+                    blob_read_bytes(&reader, sizeof(overwrite_test_str)),
+                    "blob_overwrite_bytes");
+
+   expect_equal(uint32_test, blob_read_uint32(&reader),
+                "blob_write/read_uint32");
+   expect_equal(uint32_overwrite, blob_read_uint32(&reader),
+                "blob_overwrite_uint32");
+   expect_equal(uint64_test, blob_read_uint64(&reader),
+                "blob_write/read_uint64");
+   expect_equal((intptr_t) blob, blob_read_intptr(&reader),
+                "blob_write/read_intptr");
+   expect_equal_str(string_test_str, blob_read_string(&reader),
+                    "blob_write/read_string");
+
+   expect_equal(reader.end - reader.data, reader.current - reader.data,
+                "read_consumes_all_bytes");
+   expect_equal(false, reader.overrun, "read_does_not_overrun");
+
+   ralloc_free(ctx);
+}
+
+/* Test that data values are written and read with proper alignment. */
+static void
+test_alignment(void)
+{
+   void *ctx = ralloc_context(NULL);
+   struct blob *blob;
+   struct blob_reader reader;
+   uint8_t bytes[] = "ABCDEFGHIJKLMNOP";
+   size_t delta, last, num_bytes;
+
+   blob = blob_create(ctx);
+
+   /* First, write an intptr value to the blob and capture that size. This is
+    * the expected offset between any pair of intptr values (if written with
+    * alignment).
+    */
+   blob_write_intptr(blob, (intptr_t) blob);
+
+   delta = blob->size;
+   last = blob->size;
+
+   /* Then loop doing the following:
+    *
+    *   1. Write an unaligned number of bytes
+    *   2. Verify that write results in an unaligned size
+    *   3. Write an intptr_t value
+    *   2. Verify that that write results in an aligned size
+    */
+   for (num_bytes = 1; num_bytes < sizeof(intptr_t); num_bytes++) {
+      blob_write_bytes(blob, bytes, num_bytes);
+
+      expect_unequal(delta, blob->size - last, "unaligned write of bytes");
+
+      blob_write_intptr(blob, (intptr_t) blob);
+
+      expect_equal(2 * delta, blob->size - last, "aligned write of intptr");
+
+      last = blob->size;
+   }
+
+   /* Finally, test that reading also does proper alignment. Since we know
+    * that values were written with all the right alignment, all we have to do
+    * here is verify that correct values are read.
+    */
+   blob_reader_init(&reader, blob->data, blob->size);
+
+   expect_equal((intptr_t) blob, blob_read_intptr(&reader),
+                "read of initial, aligned intptr_t");
+
+   for (num_bytes = 1; num_bytes < sizeof(intptr_t); num_bytes++) {
+      expect_equal_bytes(bytes, blob_read_bytes(&reader, num_bytes),
+                         num_bytes, "unaligned read of bytes");
+      expect_equal((intptr_t) blob, blob_read_intptr(&reader),
+                   "aligned read of intptr_t");
+   }
+
+   ralloc_free(ctx);
+}
+
+/* Test that we detect overrun. */
+static void
+test_overrun(void)
+{
+   void *ctx =ralloc_context(NULL);
+   struct blob *blob;
+   struct blob_reader reader;
+   uint32_t value = 0xdeadbeef;
+
+   blob = blob_create(ctx);
+
+   blob_write_uint32(blob, value);
+
+   blob_reader_init(&reader, blob->data, blob->size);
+
+   expect_equal(value, blob_read_uint32(&reader), "read before overrun");
+   expect_equal(false, reader.overrun, "overrun flag not set");
+   expect_equal(0, blob_read_uint32(&reader), "read at overrun");
+   expect_equal(true, reader.overrun, "overrun flag set");
+
+   ralloc_free(ctx);
+}
+
+/* Test that we can read and write some large objects, (exercising the code in
+ * the blob_write functions to realloc blob->data.
+ */
+static void
+test_big_objects(void)
+{
+   void *ctx = ralloc_context(NULL);
+   struct blob *blob;
+   struct blob_reader reader;
+   int size = 1000;
+   int count = 1000;
+   size_t i;
+   char *buf;
+
+   blob = blob_create(ctx);
+
+   /* Initialize our buffer. */
+   buf = ralloc_size(ctx, size);
+   for (i = 0; i < size; i++) {
+      buf[i] = i % 256;
+   }
+
+   /* Write it many times. */
+   for (i = 0; i < count; i++) {
+      blob_write_bytes(blob, buf, size);
+   }
+
+   blob_reader_init(&reader, blob->data, blob->size);
+
+   /* Read and verify it many times. */
+   for (i = 0; i < count; i++) {
+      expect_equal_bytes((uint8_t *) buf, blob_read_bytes(&reader, size), size,
+                         "read of large objects");
+   }
+
+   expect_equal(reader.end - reader.data, reader.current - reader.data,
+                "number of bytes read reading large objects");
+
+   expect_equal(false, reader.overrun,
+                "overrun flag not set reading large objects");
+
+   ralloc_free(ctx);
+}
+
+int
+main (void)
+{
+   test_write_and_read_functions ();
+   test_alignment ();
+   test_overrun ();
+   test_big_objects ();
+
+   return error ? 1 : 0;
+}