I'm trying to build a 64-bit library called libffi using MSVC. It contains a bunch of 'C' files and another file with the extension .S whose file contents seem to be mostly assembler - but with certain 'C' traits, such as #defines / #includes etc. The file contents look something like this:-
As you can see, the presence of #ifdef _MSC_VER creates the impression that it should be buildable with MSVC - but if I add it to a VS2015 project, VS2015 doesn't even seem to recognise it (clicking 'Properties' for the file simply says Does not participate in build).
I tried changing the file extension to .c but that didn't help either. I just got loads of compiler errors - starting with error C2061: syntax error: identifier 'ffi_call_win64' which occurs at the line I've indicated in blue.
What am I doing wrong :confused:
[Edit...] I think I'm starting to understand what's wrong... where I see the text:- Does not participate in build, I realised later that it's an entry in a drop-down list. If I go back to my previous compiler (VS2005) the relevant entry in that list box says:- Microsoft Macro Assembler. However, that option isn't present with VS2015 (Community Edition). Is the Macro Assembler an additional tool that I need to install separately? Or is assembly language just not supported in the Community Edition?
Code:
#define LIBFFI_ASM
#include <fficonfig.h>
#include <ffi.h>
/* Constants for ffi_call_win64 */
#define STACK 0
#define PREP_ARGS_FN 32
#define ECIF 40
#define CIF_BYTES 48
#define CIF_FLAGS 56
#define RVALUE 64
#define FN 72
/* ffi_call_win64 (void (*prep_args_fn)(char *, extended_cif *),
extended_cif *ecif, unsigned bytes, unsigned flags,
unsigned *rvalue, void (*fn)());
*/
#ifdef _MSC_VER
PUBLIC ffi_call_win64
EXTRN __chkstk:NEAR
EXTRN ffi_closure_win64_inner:NEAR
_TEXT SEGMENT
;;; ffi_closure_win64 will be called with these registers set:
;;; rax points to 'closure'
;;; r11 contains a bit mask that specifies which of the
;;; first four parameters are float or double
;;;
;;; It must move the parameters passed in registers to their stack location,
;;; call ffi_closure_win64_inner for the actual work, then return the result.
;;;
ffi_closure_win64 PROC FRAME
;; copy register arguments onto stack
test r11, 1
jne first_is_float
mov QWORD PTR [rsp+8], rcx
jmp second
first_is_float:
movlpd QWORD PTR [rsp+8], xmm0
second:
test r11, 2
jne second_is_float
mov QWORD PTR [rsp+16], rdx
jmp third
second_is_float:
movlpd QWORD PTR [rsp+16], xmm1
third:
test r11, 4
jne third_is_float
mov QWORD PTR [rsp+24], r8
jmp fourth
third_is_float:
movlpd QWORD PTR [rsp+24], xmm2
// tons of other stuff
#endifI tried changing the file extension to .c but that didn't help either. I just got loads of compiler errors - starting with error C2061: syntax error: identifier 'ffi_call_win64' which occurs at the line I've indicated in blue.
What am I doing wrong :confused:
[Edit...] I think I'm starting to understand what's wrong... where I see the text:- Does not participate in build, I realised later that it's an entry in a drop-down list. If I go back to my previous compiler (VS2005) the relevant entry in that list box says:- Microsoft Macro Assembler. However, that option isn't present with VS2015 (Community Edition). Is the Macro Assembler an additional tool that I need to install separately? Or is assembly language just not supported in the Community Edition?
