add libgccjit helloworld

CMakeLists.txt

@@ -8,7 +8,7 @@ enable_testing()
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake")
 
 option(LLVM_JIT "Controls whether LLVM JIT compilation will be enabled" ON)
-option(GCC_JIT "Controls whether GCC JIT compilation will be enabled" OFF)
+option(GCC_JIT "Controls whether GCC JIT compilation will be enabled" ON)
 
 if (LLVM_JIT)
   find_package(LLVM REQUIRED CONFIG)

LICENSE

@@ -0,0 +1,5 @@
+Most of Ravi is under MIT License
+There are components that are under GPL - please see relevant
+source files. These are optional components that are part of the
+libgccjit implementation of the JIT compiler. You can remove these
+components if you do not want GPL license.

tests/test_gccjit.c

@@ -1 +1,127 @@
-#include <stdio.h>
+/* This is a sample helloworld program obtained
+   from https://gcc.gnu.org/onlinedocs/jit/intro/tutorial01.html
+*/
+
+/* Smoketest example for libgccjit.so
+   Copyright (C) 2014-2015 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include <libgccjit.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+
+static void
+create_code (gcc_jit_context *ctxt)
+{
+  /* Let's try to inject the equivalent of:
+     void
+     greet (const char *name)
+     {
+        printf ("hello %s\n", name);
+     }
+  */
+  gcc_jit_type *void_type =
+    gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_VOID);
+  gcc_jit_type *const_char_ptr_type =
+    gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_CONST_CHAR_PTR);
+  gcc_jit_param *param_name =
+    gcc_jit_context_new_param (ctxt, NULL, const_char_ptr_type, "name");
+  gcc_jit_function *func =
+    gcc_jit_context_new_function (ctxt, NULL,
+                                  GCC_JIT_FUNCTION_EXPORTED,
+                                  void_type,
+                                  "greet",
+                                  1, &param_name,
+                                  0);
+
+  gcc_jit_param *param_format =
+    gcc_jit_context_new_param (ctxt, NULL, const_char_ptr_type, "format");
+  gcc_jit_function *printf_func =
+    gcc_jit_context_new_function (ctxt, NULL,
+				  GCC_JIT_FUNCTION_IMPORTED,
+				  gcc_jit_context_get_type (
+				     ctxt, GCC_JIT_TYPE_INT),
+				  "printf",
+				  1, &param_format,
+				  1);
+  gcc_jit_rvalue *args[2];
+  args[0] = gcc_jit_context_new_string_literal (ctxt, "hello %s\n");
+  args[1] = gcc_jit_param_as_rvalue (param_name);
+
+  gcc_jit_block *block = gcc_jit_function_new_block (func, NULL);
+
+  gcc_jit_block_add_eval (
+    block, NULL,
+    gcc_jit_context_new_call (ctxt,
+                              NULL,
+                              printf_func,
+                              2, args));
+  gcc_jit_block_end_with_void_return (block, NULL);
+}
+
+int
+main (int argc, char **argv)
+{
+  gcc_jit_context *ctxt;
+  gcc_jit_result *result;
+
+  /* Get a "context" object for working with the library.  */
+  ctxt = gcc_jit_context_acquire ();
+  if (!ctxt)
+    {
+      fprintf (stderr, "NULL ctxt");
+      exit (1);
+    }
+
+  /* Set some options on the context.
+     Let's see the code being generated, in assembler form.  */
+  gcc_jit_context_set_bool_option (
+    ctxt,
+    GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE,
+    0);
+
+  /* Populate the context.  */
+  create_code (ctxt);
+
+  /* Compile the code.  */
+  result = gcc_jit_context_compile (ctxt);
+  if (!result)
+    {
+      fprintf (stderr, "NULL result");
+      exit (1);
+    }
+
+  /* Extract the generated code from "result".  */
+  typedef void (*fn_type) (const char *);
+  fn_type greet =
+    (fn_type)gcc_jit_result_get_code (result, "greet");
+  if (!greet)
+    {
+      fprintf (stderr, "NULL greet");
+      exit (1);
+    }
+
+  /* Now call the generated function: */
+  greet ("world");
+  fflush (stdout);
+
+  gcc_jit_context_release (ctxt);
+  gcc_jit_result_release (result);
+  return 0;
+}