[PATCH 6/6] FIXME: jit: add test of failing must-TCO

[David Malcolm]

Uses the jit diagnostic integration support from prior patch

TODO:
  - needs ChangeLog
  - blurb
---
 .../jit.dg/test-error-impossible-must-tail-call.c  | 93 ++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 gcc/testsuite/jit.dg/test-error-impossible-must-tail-call.c

diff --git a/gcc/testsuite/jit.dg/test-error-impossible-must-tail-call.c b/gcc/testsuite/jit.dg/test-error-impossible-must-tail-call.c
new file mode 100644
index 0000000..5bcfd59
--- /dev/null
+++ b/gcc/testsuite/jit.dg/test-error-impossible-must-tail-call.c
@@ -0,0 +1,93 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "libgccjit.h"
+
+#include "harness.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+  struct box { char dummy[64]; int i; };
+
+  extern struct box
+  returns_struct (int i);
+
+#ifdef __cplusplus
+}
+#endif
+
+void
+create_code (gcc_jit_context *ctxt, void *user_data)
+{
+  /* Let's try to inject the equivalent of:
+
+       int test (int i)
+       {
+         return [MUST TAIL CALL] returns_struct (i).i;
+       }
+
+     and verify that we get a sane error when the tail call
+     optimization can't be done.  */
+
+  gcc_jit_type *char_type =
+    gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_CHAR);
+  gcc_jit_type *int_type =
+    gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_INT);
+
+  /* Declare "struct box.  */
+  gcc_jit_type *array_type =
+    gcc_jit_context_new_array_type (ctxt, NULL, char_type, 64);
+  gcc_jit_field *field_dummy =
+    gcc_jit_context_new_field (ctxt, NULL, array_type, "dummy");
+  gcc_jit_field *field_i =
+    gcc_jit_context_new_field (ctxt, NULL, int_type, "i");
+  gcc_jit_field *fields[2] = {field_dummy, field_i};
+  gcc_jit_struct *struct_box =
+    gcc_jit_context_new_struct_type (ctxt, NULL, "box", 2, fields);
+
+  /* Declare the imported function.  */
+  gcc_jit_param *called_fn_param_i =
+    gcc_jit_context_new_param (ctxt, NULL, int_type, "i");
+  gcc_jit_function *called_fn =
+    gcc_jit_context_new_function (ctxt, NULL,
+                                  GCC_JIT_FUNCTION_IMPORTED,
+                                  gcc_jit_struct_as_type (struct_box),
+                                  "called_function",
+                                  1, &called_fn_param_i,
+                                  0);
+
+  /* Build the test_fn.  */
+  gcc_jit_param *caller_param_i =
+    gcc_jit_context_new_param (ctxt, NULL, int_type, "i");
+  gcc_jit_function *test_fn =
+    gcc_jit_context_new_function (ctxt, NULL,
+                                  GCC_JIT_FUNCTION_EXPORTED,
+                                  int_type,
+                                  "test_caller",
+                                  1, &caller_param_i,
+                                  0);
+  gcc_jit_rvalue *arg = gcc_jit_param_as_rvalue (caller_param_i);
+
+  gcc_jit_rvalue *call =
+    gcc_jit_context_new_call (ctxt, NULL,
+                              called_fn,
+                              1, &arg);
+
+  /* Mark the call as requiring tail-call optimization.  */
+  gcc_jit_rvalue_set_bool_require_tail_call (call, 1);
+
+  gcc_jit_block *block = gcc_jit_function_new_block (test_fn, NULL);
+  gcc_jit_block_end_with_return (block, NULL,
+    gcc_jit_rvalue_access_field (call, NULL, field_i));
+}
+
+void
+verify_code (gcc_jit_context *ctxt, gcc_jit_result *result)
+{
+  CHECK_VALUE (result, NULL);
+
+  CHECK_STRING_VALUE (gcc_jit_context_get_first_error (ctxt),
+		      "cannot tail-call: FIXME: structure_value_addr");
+}
-- 
1.8.5.3