feat(external_buffer): add execution with Python ctypes

Author: umarcor

examples/vhdl/external_buffer/run.py

@@ -4,9 +4,33 @@
 #
 # Copyright (c) 2014-2019, Lars Asplund lars.anders.asplund@gmail.com
 
-from os import popen, mkdir
+from os import popen
 from os.path import join, dirname
 from vunit import VUnit
+import ctypes
+
+
+def preconf(output_path):
+    global opath
+    opath = output_path
+    return True
+
+
+def get_args(output_path):
+    args = [line.rstrip('\n') for line in open(join(output_path, 'ghdl', 'args.txt'))]
+    xargs = (ctypes.POINTER(ctypes.c_char) * (len(args) + 1))()
+    for i, arg in enumerate(args):
+        xargs[i] = ctypes.create_string_buffer(arg.encode('utf-8'))
+    return args[0], xargs
+
+
+def unload(lib):
+    import _ctypes
+    # On GNU/Linux
+    _ctypes.dlclose(lib._handle)
+    # On Windows
+    #_ctypes.FreeLibrary(gbin._handle)
+
 
 std = "2008"
 #std = "93"
@@ -20,14 +44,41 @@
 lib = ui.add_library("lib")
 lib.add_source_files(join(src_path, "test", "*.vhd"))
 
-try:
-    mkdir(join(src_path, '..', 'vunit_out'))
-except OSError as exc:
-    pass
-
-c_obj = join(src_path, '..', 'vunit_out', 'main.o')
+c_obj = join(src_path, 'test', 'main.o')
 print(popen('gcc -fPIC -rdynamic -c '+join(src_path, '**', 'main.c')+' -o '+c_obj).read())
 
 ui.set_objects([c_obj])
 
-ui.main()
+for tb in lib.get_test_benches(pattern='*', allow_empty=False):
+    tb.set_pre_config(preconf)
+
+ui.set_sim_option("ghdl.elab_e", True)
+ui._args.elaborate = True
+try:
+    ui.main()
+except SystemExit as exc:
+    if exc.code is not 0:
+        exit(exc.code)
+
+bin_path, xargv = get_args(opath)
+
+print("\nREGULAR EXECUTION")
+gbin = ctypes.CDLL(bin_path)
+gbin.main(len(xargv)-1, xargv)
+unload(gbin)
+
+print("\nPYTHON ALLOCATION")
+gbin = ctypes.CDLL(bin_path)
+
+buf = ctypes.create_string_buffer(bytes([111, 122, 133, 144, 155]), 15)
+
+for x in range(0, 15):
+    print("py " + str(x) + ": " + str(int.from_bytes(buf[x], "little")))
+
+gbin.set_bytevec_addr(0, buf)
+gbin.main(len(xargv)-1, xargv)
+
+for x in range(0, 15):
+    print("py " + str(x) + ": " + str(int.from_bytes(buf[x], "little")))
+
+unload(gbin)

examples/vhdl/external_buffer/src/test/main.c

@@ -5,9 +5,16 @@
 extern int ghdl_main (int argc, char **argv);
 
 uint8_t *D[1];
+char is_allocated[1] = {0};
+
+void set_bytevec_addr(uint8_t id, uint8_t *p) {
+  //printf("C set_bytevec_addr(%d, %p)\n", id, p);
+  D[id] = p;
+  is_allocated[id] = 1;
+}
 
 uintptr_t get_bytevec_addr(uint8_t id) {
-  //printf("C get_addr(%d): %p\n", id, D[id]);
+  //printf("C get_bytevec_addr(%d): %p\n", id, D[id]);
   return (uintptr_t)D[id];
 }
 
@@ -24,29 +31,30 @@ uint8_t read_byte(uint8_t id, uint32_t i) {
 int main(int argc, char **argv) {
 
   const uint32_t length = 5;
-
-  D[0] = (uint8_t *) malloc(3*length*sizeof(uint8_t));
-  if ( D[0] == NULL ) {
-    perror("execution of malloc() failed!\n");
-    return -1;
-  }
-
   int i;
-  for(i=0; i<length; i++) {
-    D[0][i] = (i+1)*11;
-  }
 
-  for(i=0; i<3*length; i++) {
-    printf("%d: %d\n", i, D[0][i]);
+  if (is_allocated[0] == 0) {
+    D[0] = (uint8_t *) malloc(3*length*sizeof(uint8_t));
+    if ( D[0] == NULL ) {
+      perror("execution of malloc() failed!\n");
+      return -1;
+    }
+    for(i=0; i<length; i++) {
+      D[0][i] = (i+1)*11;
+    }
+    for(i=0; i<3*length; i++) {
+      printf("%d: %d\n", i, D[0][i]);
+    }
   }
 
   ghdl_main(argc, argv);
 
-  for(i=0; i<3*length; i++) {
-    printf("%d: %d\n", i, D[0][i]);
+  if (is_allocated[0] == 0) {
+    for(i=0; i<3*length; i++) {
+      printf("%d: %d\n", i, D[0][i]);
+    }
+    free(D[0]);
   }
 
-  free(D[0]);
-
   return 0;
 }