plugin-nvptx.c (link_ptx): Constify string argument.

	libgomp/
	* plugin/plugin-nvptx.c (link_ptx): Constify string argument.
	Workaround driver library const error.
	(struct nvptx_tdata, nvptx_tdata_t): New.
	(GOMP_OFFLOAD_load_image): Use struct for target_data's real
	type.

	gcc/
	* config/nvptx/mkoffload.c (process): Constify mapping variables.
	Define target data struct and initialize it.

From-SVN: r225897

1 files changed, 26 insertions, 20 deletions

diff --git a/libgomp/plugin/plugin-nvptx.c b/libgomp/plugin/plugin-nvptx.c
index b67d301..cfb143b 100644
--- a/libgomp/plugin/plugin-nvptx.c
+++ b/libgomp/plugin/plugin-nvptx.c
@@ -804,7 +804,7 @@ nvptx_get_num_devices (void)
 
 
 static void
-link_ptx (CUmodule *module, char *ptx_code)
+link_ptx (CUmodule *module, const char *ptx_code)
 {
   CUjit_option opts[7];
   void *optvals[7];
@@ -874,7 +874,8 @@ link_ptx (CUmodule *module, char *ptx_code)
 			 cuda_error (r));
     }
 
-  r = cuLinkAddData (linkstate, CU_JIT_INPUT_PTX, ptx_code,
+  /* cuLinkAddData's 'data' argument erroneously omits the const qualifier.  */
+  r = cuLinkAddData (linkstate, CU_JIT_INPUT_PTX, (char *)ptx_code,
               strlen (ptx_code) + 1, 0, 0, 0, 0);
   if (r != CUDA_SUCCESS)
     {
@@ -1618,23 +1619,36 @@ GOMP_OFFLOAD_fini_device (int n)
   pthread_mutex_unlock (&ptx_dev_lock);
 }
 
+/* Data emitted by mkoffload.  */
+
+typedef struct nvptx_tdata
+{
+  const char *ptx_src;
+
+  const char *const *var_names;
+  size_t var_num;
+
+  const char *const *fn_names;
+  size_t fn_num;
+} nvptx_tdata_t;
+
 int
 GOMP_OFFLOAD_load_image (int ord, void *target_data,
 			 struct addr_pair **target_table)
 {
   CUmodule module;
-  char **fn_names, **var_names;
+  const char *const *fn_names, *const *var_names;
   unsigned int fn_entries, var_entries, i, j;
   CUresult r;
   struct targ_fn_descriptor *targ_fns;
-  void **img_header = (void **) target_data;
+  nvptx_tdata_t const *img_header = (nvptx_tdata_t const *) target_data;
   struct ptx_image_data *new_image;
 
   GOMP_OFFLOAD_init_device (ord);
 
   nvptx_attach_host_thread_to_device (ord);
 
-  link_ptx (&module, img_header[0]);
+  link_ptx (&module, img_header->ptx_src);
 
   pthread_mutex_lock (&ptx_image_lock);
   new_image = GOMP_PLUGIN_malloc (sizeof (struct ptx_image_data));
@@ -1644,22 +1658,14 @@ GOMP_OFFLOAD_load_image (int ord, void *target_data,
   ptx_images = new_image;
   pthread_mutex_unlock (&ptx_image_lock);
 
-  /* The mkoffload utility emits a table of pointers/integers at the start of
-     each offload image:
-
-     img_header[0] -> ptx code
-     img_header[1] -> number of variables
-     img_header[2] -> array of variable names (pointers to strings)
-     img_header[3] -> number of kernels
-     img_header[4] -> array of kernel names (pointers to strings)
-
-     The array of kernel names and the functions addresses form a
-     one-to-one correspondence.  */
+  /* The mkoffload utility emits a struct of pointers/integers at the
+     start of each offload image.  The array of kernel names and the
+     functions addresses form a one-to-one correspondence.  */
 
-  var_entries = (uintptr_t) img_header[1];
-  var_names = (char **) img_header[2];
-  fn_entries = (uintptr_t) img_header[3];
-  fn_names = (char **) img_header[4];
+  var_entries = img_header->var_num;
+  var_names = img_header->var_names;
+  fn_entries = img_header->fn_num;
+  fn_names = img_header->fn_names;
 
   *target_table = GOMP_PLUGIN_malloc (sizeof (struct addr_pair)
 				      * (fn_entries + var_entries));