Use architecture-specific va_list type

Previously, cproc effectively used used

	typedef struct { /* 32 bytes, 8-byte aligned */ } __builtin_va_list[1];

However, this is not quite correct for x86_64 nor aarch64, though
it was close enough for both to work in most cases.

In actuality, for x86_64 we want

	typedef struct { /* 24 bytes, 8-byte aligned */ } __builtin_va_list[1];

and for aarch64 we want

	typedef struct { /* 32 bytes, 8-byte aligned */ } __builtin_va_list;

The difference only appears when the size of va_list matters, or
when va_list is passed as a parameter. However, the former is not
often the case, and the aarch64 ABI replaces aggregate arguments
with pointers to caller-allocated memory, which is quite similar
to arrays decaying to pointers in C except that the struct is not
copied.

Additionally, riscv64 simply uses

	typedef void *__builtin_va_list;

which again has a different size and calling convention.

To fix this, make the __builtin_va_list type architecture-specific
and use architecture-specific tests for varargs-related functionality.

1 files changed, 0 insertions, 9 deletions

diff --git a/type.c b/type.c
index a97175a..1d28213 100644
--- a/type.c
+++ b/type.c
@@ -39,15 +39,6 @@ struct type typefloat   = FLTTYPE(TYPEFLOAT, 4);
 struct type typedouble  = FLTTYPE(TYPEDOUBLE, 8);
 struct type typeldouble = FLTTYPE(TYPELDOUBLE, 16);
 
-struct type typevalist = {
-	.kind = TYPEARRAY, .size = 32, .align = 8, .array = {1},
-	.prop = PROPOBJECT|PROPDERIVED|PROPAGGR,
-	.base = &(struct type){
-		.kind = TYPESTRUCT, .size = 32, .align = 8,
-		.prop = PROPOBJECT|PROPAGGR,
-	},
-};
-
 struct type *
 mktype(enum typekind kind, enum typeprop prop)
 {