Feature/memory arena (#631)

* First pass at MemoryArena.

* First pass at RandomGenerator.

* Extract TestContext into external source file.

* Fix warning on printf.

* Use enum classes for Test enums.
OutputMode -> TestOutputMode.

* First pass at FreeList unit test.

* Auto registering tests.
Improvements to RandomGenerator.

* Remove the need for unitTest headers - cos can use registering.

* Added unitTest for MemoryArena.

* Do unit tests.

* Fix typo.

1 files changed, 55 insertions, 0 deletions

diff --git a/tools/slang-test/unit-test-free-list.cpp b/tools/slang-test/unit-test-free-list.cpp
new file mode 100644
index 000000000..649c59571
--- /dev/null
+++ b/tools/slang-test/unit-test-free-list.cpp
@@ -0,0 +1,55 @@
+// unit-test-free-list.cpp
+
+#include "../../source/core/slang-free-list.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "test-context.h"
+
+#include "../../source/core/slang-random-generator.h"
+#include "../../source/core/list.h"
+
+using namespace Slang;
+
+static void freeListUnitTest()
+{
+    FreeList freeList;
+    freeList.init(sizeof(int), sizeof(void*), 10);
+
+    DefaultRandomGenerator randGen(0x24343);
+
+    List<int*> allocs;
+
+    for (int i = 0; i < 1000; i++)
+    {
+        const int numAlloc = randGen.nextInt32UpTo(20);
+        
+        for (int j = 0; j < numAlloc; j++)
+        {
+            int* ptr = (int*)freeList.allocate();
+            *ptr = i;
+            allocs.Add(ptr);
+        }
+
+        int numDealloc = randGen.nextInt32UpTo(19);
+        numDealloc = int(allocs.Count()) < numDealloc ? int(allocs.Count()) : numDealloc;
+
+        for (int j = 0; j < numDealloc; j++)
+        {
+            const int index = randGen.nextInt32UpTo(int(allocs.Count()));
+
+            int* alloc = allocs[index];
+
+            SLANG_CHECK(*alloc <= i);
+            SLANG_CHECK(*alloc >= 0);
+
+            freeList.deallocate(alloc);
+
+            allocs.FastRemoveAt(index);
+        }
+    }
+}
+
+SLANG_UNIT_TEST("FreeList", freeListUnitTest);
\ No newline at end of file