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author | Xavier Leroy <xavierleroy@users.noreply.github.com> | 2015-04-22 14:27:12 +0200 |
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committer | Xavier Leroy <xavierleroy@users.noreply.github.com> | 2015-04-22 14:27:12 +0200 |
commit | 0bf99217426a44046ef0aaa7f84a9b2a3646ed89 (patch) | |
tree | e4f983980a5001792b90ed8f3dbd8fa241e43eb1 /cfrontend/PrintCsyntax.ml | |
parent | 08b2b46f15e70b11c044e4e9a7c8438a96d57ed7 (diff) | |
parent | ca4aa822693f4d98de99fd3f13c1523d733e1cb0 (diff) | |
download | compcert-0bf99217426a44046ef0aaa7f84a9b2a3646ed89.tar.gz compcert-0bf99217426a44046ef0aaa7f84a9b2a3646ed89.zip |
Merge pull request #40 from AbsInt/inline-asm
GCC-style extended inline asm.
The subset implemented is:
- zero or one output
- output constraints "=r" (to register) or "=m" (to memory)
- zero, one or several inputs
- input constraints "r" (in register), "m" (in memory), "i" and "n" (compile-time integer constant)
- clobbered registers (the 3rd argument)
- both anonymous (%3) and named (%[name]) operands
- modifiers %R and %Q to refer to the most significant / least significant part of a register pair holding a 64-bit integer. (Undocumented GCC ARM feature.)
All asm statements are treated as "volatile", possibly modifying memory and condition codes.
Diffstat (limited to 'cfrontend/PrintCsyntax.ml')
-rw-r--r-- | cfrontend/PrintCsyntax.ml | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/cfrontend/PrintCsyntax.ml b/cfrontend/PrintCsyntax.ml index 882272b8..39de282b 100644 --- a/cfrontend/PrintCsyntax.ml +++ b/cfrontend/PrintCsyntax.ml @@ -236,6 +236,8 @@ let rec expr p (prec, e) = expr (prec1, a1) (name_binop op) expr (prec2, a2) | Ecast(a1, ty) -> fprintf p "(%s) %a" (name_type ty) expr (prec', a1) + | Eassign(res, Ebuiltin(EF_inline_asm(txt, sg, clob), _, args, _), _) -> + extended_asm p txt (Some res) args clob | Eassign(a1, a2, _) -> fprintf p "%a =@ %a" expr (prec1, a1) expr (prec2, a2) | Eassignop(op, a1, a2, _, _) -> @@ -262,6 +264,8 @@ let rec expr p (prec, e) = (extern_atom txt) exprlist (false, args) | Ebuiltin(EF_external(id, sg), _, args, _) -> fprintf p "%s@[<hov 1>(%a)@]" (extern_atom id) exprlist (true, args) + | Ebuiltin(EF_inline_asm(txt, sg, clob), _, args, _) -> + extended_asm p txt None args clob | Ebuiltin(_, _, args, _) -> fprintf p "<unknown builtin>@[<hov 1>(%a)@]" exprlist (true, args) | Eparen(a1, tycast, ty) -> @@ -277,6 +281,32 @@ and exprlist p (first, rl) = expr p (2, r); exprlist p (false, rl) +and extended_asm p txt res args clob = + fprintf p "asm volatile (@[<hv 0>%S" (extern_atom txt); + fprintf p "@ :"; + begin match res with + | None -> () + | Some e -> fprintf p " \"=r\"(%a)" expr (0, e) + end; + let rec inputs p (first, el) = + match el with + | Enil -> () + | Econs(e1, el) -> + if not first then fprintf p ",@ "; + fprintf p "\"r\"(%a)" expr (0, e1); + inputs p (false, el) in + fprintf p "@ : @[<hov 0>%a@]" inputs (true, args); + begin match clob with + | [] -> () + | c1 :: cl -> + fprintf p "@ : @[<hov 0>%S" (extern_atom c1); + List.iter + (fun c -> fprintf p ",@ %S" (extern_atom c)) + cl; + fprintf p "@]" + end; + fprintf p ")@]" + let print_expr p e = expr p (0, e) let print_exprlist p el = exprlist p (true, el) |