automatic malloc need detection for new

2 files changed, 49 insertions, 1 deletions

diff --git a/tests/new.cpp b/tests/new.cpp
new file mode 100644
index 00000000..3e09fbc1
--- /dev/null
+++ b/tests/new.cpp
@@ -0,0 +1,38 @@
+// Emscripten tests
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+struct Structy { char data[100]; int x; };
+
+int main() {
+  int NUM = 100;
+  char* allocations[NUM];
+  for (int i = 0; i < NUM/2; i++) {
+    allocations[i] = (char*){{{ NEW }}};
+    assert(allocations[i]);
+    if (i > 10 && i%4 == 1 && allocations[i-10]) {
+      {{{ DELETE }}}(allocations[i-10]);
+      allocations[i-10] = NULL;
+    }
+  }
+  for (int i = NUM/2; i < NUM; i++) {
+    allocations[i] = (char*){{{ NEW }}};
+    assert(allocations[i]);
+    if (i > 10 && i%4 != 1 && allocations[i-10]) {
+      {{{ DELETE }}}(allocations[i-10]);
+      allocations[i-10] = NULL;
+    }
+  }
+  char* first = allocations[0];
+  for (int i = 0; i < NUM; i++) {
+    if (allocations[i]) {
+      {{{ DELETE }}}(allocations[i]);
+    }
+  }
+  char *last = (char*){{{ NEW }}}; /* should be identical, as we free'd it all */
+  char *newer = (char*){{{ NEW }}}; /* should be different */
+  printf("*%d,%d*\n", first == last, first == newer);
+}
+
diff --git a/tests/runner.py b/tests/runner.py
index 86d37e8e..34071a91 100644
--- a/tests/runner.py
+++ b/tests/runner.py
@@ -3844,11 +3844,21 @@ def process(filename):
         try_delete(os.path.join(self.get_dir(), 'src.cpp.o.js'))
         output = Popen([EMCC, path_from_root('tests', 'dlmalloc_test.c'),
                         '-o', os.path.join(self.get_dir(), 'src.cpp.o.js')], stdout=PIPE, stderr=self.stderr_redirect).communicate()
-        #print output
 
         self.do_run('x', '*1,0*', ['200', '1'], no_build=True)
         self.do_run('x', '*400,0*', ['400', '400'], no_build=True)
 
+        # The same for new and all its variants
+        src = open(path_from_root('tests', 'new.cpp')).read()
+        for new, delete in [
+          ('malloc(100)', 'free'),
+          ('new char[100]', 'delete[]'),
+          ('new Structy', 'delete'),
+          ('new int', 'delete'),
+          ('new Structy[10]', 'delete[]'),
+        ]:
+          self.do_run(src.replace('{{{ NEW }}}', new).replace('{{{ DELETE }}}', delete), '*1,0*')
+
     def test_libcxx(self):
       self.do_run(path_from_root('tests', 'libcxx'),
                    'june -> 30\nPrevious (in alphabetical order) is july\nNext (in alphabetical order) is march',