Cleanup test_memcpy_alignment/test_memset_alignment. NFC (#22668)

- Remove a bunch of unused C++ headers
- Convert to C
- Tabs to spaces
- Apply coding style.

I'm not sure we really need these tests anymore but maybe its good to
have them for test our different optimized versions of memset/memcpy.

Author: sbc100

test/test_core.py

@@ -2695,10 +2695,10 @@ def test_memcpy3(self):
 
   @also_with_standalone_wasm()
   def test_memcpy_alignment(self):
-    self.do_runf('test_memcpy_alignment.cpp', 'OK.')
+    self.do_runf('test_memcpy_alignment.c', 'OK.')
 
   def test_memset_alignment(self):
-    self.do_runf('test_memset_alignment.cpp', 'OK.')
+    self.do_runf('test_memset_alignment.c', 'OK.')
 
   def test_memset(self):
     self.do_core_test('test_memset.c')

test/test_memcpy_alignment.c

@@ -0,0 +1,81 @@
+// Copyright 2017 The Emscripten Authors.  All rights reserved.
+// Emscripten is available under two separate licenses, the MIT license and the
+// University of Illinois/NCSA Open Source License.  Both these licenses can be
+// found in the LICENSE file.
+
+#include <memory.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+char dst[1024*1024*2+64] = {};
+char src[1024*1024*2+64] = {};
+
+#define GUARDSIZE 32
+void test_memcpy(int copySize, int srcOffset, int dstOffset) {
+  char *dstContent = dst + GUARDSIZE + dstOffset;
+  char *srcContent = src + GUARDSIZE + srcOffset;
+
+  char *dstGuardBefore = dstContent - GUARDSIZE;
+  char *dstGuardAfter  = dstContent + copySize;
+
+  char *srcGuardBefore = srcContent - GUARDSIZE;
+  char *srcGuardAfter  = srcContent + copySize;
+
+  char guard = (char)rand();
+
+  for (int i = 0; i < GUARDSIZE; ++i) {
+    // Generate a guardband area around dst memory that should not change.
+    dstGuardBefore[i] = (char)(guard ^ i);
+    dstGuardAfter[i] = (char)(guard ^ i);
+  }
+
+  // Generate copy source data
+  char s = (char)rand();
+  for (int i = 0; i < copySize + srcOffset + 2*GUARDSIZE; ++i) {
+    src[i] = (char)(s - i);
+  }
+
+  memcpy(dstContent, srcContent, copySize);
+  if (!!memcmp(dstContent, srcContent, copySize)) {
+    printf("test_memcpy(copySize=%d, srcOffset=%d, dstOffset=%d failed!\n", copySize, srcOffset, dstOffset);
+    exit(1);
+  }
+
+  // Verify guardband area
+  for (int i = 0; i < GUARDSIZE; ++i) {
+    // Generate a guardband area around dst memory that should not change.
+    if (dstGuardBefore[i] != (char)(guard ^ i)) {
+      printf("test_memcpy(copySize=%d, srcOffset=%d, dstOffset=%d failed! Pre-guardband area at i=%d overwritten!\n", copySize, srcOffset, dstOffset, i);
+      exit(1);
+    }
+    if (dstGuardAfter[i] != (char)(guard ^ i)) {
+      printf("test_memcpy(copySize=%d, srcOffset=%d, dstOffset=%d failed! Post-guardband area at i=%d overwritten!\n", copySize, srcOffset, dstOffset, i);
+      exit(1);
+    }
+  }
+}
+
+void test_copysize(int copySize) {
+  int offsets[6] = { 0, 3, 4, 5, 8, 11 };
+
+  for (int srcOffset = 0; srcOffset < 6; ++srcOffset) {
+    for (int dstOffset = 0; dstOffset < 6; ++dstOffset) {
+      test_memcpy(copySize, offsets[srcOffset], offsets[dstOffset]);
+    }
+  }
+}
+
+int main() {
+  for (int copySize = 0; copySize < 128; ++copySize) {
+    test_copysize(copySize);
+  }
+
+  for (int copySizeI = 128; copySizeI <= 1048576; copySizeI <<= 1) {
+    for (int copySizeJ = 1; copySizeJ <= 16; copySizeJ <<= 1) {
+      test_copysize(copySizeI | copySizeJ);
+    }
+  }
+
+  printf("OK.\n");
+}

test/test_memcpy_alignment.cpp

@@ -0,0 +1,74 @@
+// Copyright 2017 The Emscripten Authors.  All rights reserved.
+// Emscripten is available under two separate licenses, the MIT license and the
+// University of Illinois/NCSA Open Source License.  Both these licenses can be
+// found in the LICENSE file.
+
+#include <memory.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+char ptr[1024*1024*2+64] = {};
+
+#define GUARDSIZE 32
+void test_memset(int copySize, int offset) {
+  char *content = ptr + GUARDSIZE + offset;
+
+  char *guardBefore = content - GUARDSIZE;
+  char *guardAfter  = content + copySize;
+
+  char guard = (char)rand();
+
+  for (int i = 0; i < GUARDSIZE; ++i) {
+    // Generate a guardband area around memory that should not change.
+    guardBefore[i] = (char)(guard ^ i);
+    guardAfter[i] = (char)(guard ^ i);
+  }
+
+  // Generate fill source data
+  char s = (char)(rand() ^ 0xF0);
+
+  memset(content, s, copySize);
+  for (int i = 0; i < copySize; ++i) {
+    if (content[i] != s) {
+      printf("test_memset(copySize=%d, offset=%d failed!\n", copySize, offset);
+      exit(1);
+    }
+  }
+
+  // Verify guardband area
+  for (int i = 0; i < GUARDSIZE; ++i) {
+    // Generate a guardband area around memory that should not change.
+    if (guardBefore[i] != (char)(guard ^ i)) {
+      printf("test_memset(copySize=%d, offset=%d failed! Pre-guardband area at i=%d overwritten!\n", copySize, offset, i);
+      exit(1);
+    }
+    if (guardAfter[i] != (char)(guard ^ i)) {
+      printf("test_memset(copySize=%d, offset=%d failed! Post-guardband area at i=%d overwritten!\n", copySize, offset, i);
+      exit(1);
+    }
+  }
+}
+
+void test_copysize(int copySize) {
+  for (int offset = 0; offset < 31; ++offset) {
+    test_memset(copySize, offset);
+  }
+}
+
+int main() {
+  srand(time(NULL));
+
+  for (int copySize = 0; copySize < 128; ++copySize) {
+    test_copysize(copySize);
+  }
+
+  for (int copySizeI = 128; copySizeI <= 1048576; copySizeI <<= 1) {
+    for (int copySizeJ = 1; copySizeJ <= 16; copySizeJ <<= 1) {
+      test_copysize(copySizeI | copySizeJ);
+    }
+  }
+
+  printf("OK.\n");
+}