Add support to define structures in mig.

Basic syntax is presented below and allows users to define
nested structured types by using simpler or structure types as
members. Mig will use the C padding and alignment rules to produce
the same size as the corresponding C structures.

type timespec_t = struct {
  uint32_t tv_sec;
  uint32_t tv_nsec;
};

This allows us to build stubs that are more easily adaptable to other
architectures.
Message-Id: <Y2SjQSMOINY8I5Dy@viriathus>

2 files changed, 32 insertions, 0 deletions

diff --git a/tests/good/complex-types.defs b/tests/good/complex-types.defs
index 0a5c952..58d417e 100644
--- a/tests/good/complex-types.defs
+++ b/tests/good/complex-types.defs
@@ -32,9 +32,21 @@ type mach_port_array_t = array[] of mach_port_t;
 type char_struct_t = struct[4] of char;
 type string_t = array[256] of char;
 
+type simple_struct_t = struct { byte a; };
+
+type complex_struct_x_t = struct { simple_struct_t a; simple_struct_t b; int c; };
+
+type complex_struct_y_t = struct { complex_struct_x_t a; byte b; };
+
+type complex_struct_z_t = struct { complex_struct_y_t a; int d; };
+
 routine callcomplex(port : mach_port_t;
                   p : pointer_t;
                   q : intptr_t;
                   str : char_struct_t;
                   strt : string_t;
+                  simple : simple_struct_t;
+                  x : complex_struct_x_t;
+                  y : complex_struct_y_t;
+                  z : complex_struct_z_t;
                   out vec : mach_port_array_t);
diff --git a/tests/includes/types.h b/tests/includes/types.h
index fe70e69..2a70443 100644
--- a/tests/includes/types.h
+++ b/tests/includes/types.h
@@ -31,6 +31,26 @@ typedef struct char_struct {
 typedef char string_t[256];
 typedef const char* const_string_t;
 
+typedef struct simple_struct {
+  char a;
+} simple_struct_t;
+
+typedef struct complex_struct_x {
+  simple_struct_t a;
+  simple_struct_t b;
+  int c;
+} complex_struct_x_t;
+
+typedef struct complex_struct_y {
+  complex_struct_x_t a;
+  char b;
+} complex_struct_y_t;
+
+typedef struct complex_struct_z {
+  complex_struct_y_t a;
+  int d;
+} complex_struct_z_t;
+
 static inline int8_t int_to_int8(int n) {
   return (int8_t) n;
 }