fix VLA/continue issue

as reported in
http://lists.nongnu.org/archive/html/tinycc-devel/2015-04/msg00131.html. Note
that this is one of two separate VLA bugs:

 A. labels aren't reached by program execution, so the stack pointer is
 never saved
 B. continue doesn't restore the stack pointer as goto does

This fixes only B. I'm not sure whether the same issue applies to break
as well as continue.

Add a test case, but disable tests #78 and #79 for now as they're not
fully fixed until the issue described in
http://lists.nongnu.org/archive/html/tinycc-devel/2015-04/msg00110.html
is resolved.

3 files changed, 99 insertions, 2 deletions

diff --git a/tests/tests2/79_vla_continue.c b/tests/tests2/79_vla_continue.c
new file mode 100644
index 0000000..9c48c1d
--- /dev/null
+++ b/tests/tests2/79_vla_continue.c
@@ -0,0 +1,92 @@
+#include <stdio.h>
+
+int f(void)
+{
+  return 5;
+}
+
+void test1()
+{
+  int count = 10;
+  void *addr[10];
+  for(;count--;) {
+    int a[f()];
+
+    addr[count] = a;
+
+    continue;
+  }
+
+  if(addr[9] == addr[0]) {
+    printf("OK\n");
+  } else {
+    printf("NOT OK\n");
+  }
+}
+
+void test2()
+{
+  int count = 10;
+  void *addr[count];
+  for(;count--;) {
+    int a[f()];
+
+    addr[count] = a;
+
+    continue;
+  }
+
+  if(addr[9] == addr[0]) {
+    printf("OK\n");
+  } else {
+    printf("NOT OK\n");
+  }
+}
+
+void test3()
+{
+  int count = 10;
+  void *addr[count];
+  while(count--) {
+    int a[f()];
+
+    addr[count] = a;
+
+    continue;
+  }
+
+  if(addr[9] == addr[0]) {
+    printf("OK\n");
+  } else {
+    printf("NOT OK\n");
+  }
+}
+
+void test4()
+{
+  int count = 10;
+  void *addr[count];
+  do {
+    int a[f()];
+
+    addr[count] = a;
+
+    continue;
+  } while(count--);
+
+  if(addr[9] == addr[0]) {
+    printf("OK\n");
+  } else {
+    printf("NOT OK\n");
+  }
+}
+
+int main(void)
+{
+  test1();
+  test2();
+  test3();
+  test4();
+
+  return 0;
+}
diff --git a/tests/tests2/79_vla_continue.expect b/tests/tests2/79_vla_continue.expect
new file mode 100644
index 0000000..b462a5a
--- /dev/null
+++ b/tests/tests2/79_vla_continue.expect
@@ -0,0 +1,4 @@
+OK
+OK
+OK
+OK
diff --git a/tests/tests2/Makefile b/tests/tests2/Makefile
index 470716b..6148c0b 100644
--- a/tests/tests2/Makefile
+++ b/tests/tests2/Makefile
@@ -96,8 +96,9 @@ TESTS =	\
  74_nocode_wanted.test \
  75_array_in_struct_init.test \
  76_dollars_in_identifiers.test \
- 77_push_pop_macro.test \
- 78_vla_label.test
+ 77_push_pop_macro.test
+# 78_vla_label.test -- currently broken
+# 79_vla_continue.test -- currently broken
 
 # 34_array_assignment.test -- array assignment is not in C standard