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|
(* *********************************************************************)
(* *)
(* The Compcert verified compiler *)
(* *)
(* Xavier Leroy, INRIA Paris-Rocquencourt *)
(* *)
(* Copyright Institut National de Recherche en Informatique et en *)
(* Automatique. All rights reserved. This file is distributed *)
(* under the terms of the GNU General Public License as published by *)
(* the Free Software Foundation, either version 2 of the License, or *)
(* (at your option) any later version. This file is also distributed *)
(* under the terms of the INRIA Non-Commercial License Agreement. *)
(* *)
(* *********************************************************************)
(* Platform-dependent handling of pragmas *)
open Printf
open Camlcoq
open Cparser
type section_info = {
sec_name_init: string;
sec_name_uninit: string;
sec_acc_mode: string;
sec_near_access: bool
}
let default_section_info = {
sec_name_init = ".data";
sec_name_uninit = ".data"; (* COMM? *)
sec_acc_mode = "RW";
sec_near_access = false
}
let section_table : (string, section_info) Hashtbl.t =
Hashtbl.create 17
(* Built-in sections *)
let _ =
let rodata =
if Configuration.system = "linux" then ".rodata" else ".text" in
List.iter (fun (n, si) -> Hashtbl.add section_table n si) [
"CODE", {sec_name_init = ".text";
sec_name_uninit = ".text";
sec_acc_mode = "RX";
sec_near_access = false};
"DATA", {sec_name_init = ".data";
sec_name_uninit = ".data"; (* COMM? *)
sec_acc_mode = "RW";
sec_near_access = false};
"SDATA", {sec_name_init = ".sdata";
sec_name_uninit = ".sbss";
sec_acc_mode = "RW";
sec_near_access = true};
"CONST", {sec_name_init = rodata;
sec_name_uninit = rodata;
sec_acc_mode = "R";
sec_near_access = false};
"SCONST",{sec_name_init = ".sdata2";
sec_name_uninit = ".sdata2";
sec_acc_mode = "R";
sec_near_access = true};
"STRING",{sec_name_init = rodata;
sec_name_uninit = rodata;
sec_acc_mode = "R";
sec_near_access = false}
]
(* #pragma section *)
let process_section_pragma classname istring ustring addrmode accmode =
let old_si =
try Hashtbl.find section_table classname
with Not_found -> default_section_info in
let si =
{ sec_name_init =
if istring = "" then old_si.sec_name_init else istring;
sec_name_uninit =
if ustring = "" then old_si.sec_name_uninit else ustring;
sec_acc_mode =
if accmode = "" then old_si.sec_acc_mode else accmode;
sec_near_access =
if addrmode = ""
then old_si.sec_near_access
else (addrmode = "near-code") || (addrmode = "near-data") } in
Hashtbl.add section_table classname si
(* #pragma use_section *)
let use_section_table : (AST.ident, section_info) Hashtbl.t =
Hashtbl.create 51
let process_use_section_pragma classname id =
try
let info = Hashtbl.find section_table classname in
Hashtbl.add use_section_table (intern_string id) info
with Not_found ->
C2Clight.error (sprintf "unknown section name `%s'" classname)
let default_use_section id classname =
if not (Hashtbl.mem use_section_table id) then begin
let info =
try Hashtbl.find section_table classname
with Not_found -> assert false in
Hashtbl.add use_section_table id info
end
let define_function id d =
default_use_section id "CODE"
let define_stringlit id =
default_use_section id "STRING"
let define_variable id d =
let is_small limit =
match C2Clight.atom_sizeof id with
| None -> false
| Some sz -> sz <= limit in
let sect =
if C2Clight.atom_is_readonly id then
if is_small !Clflags.option_small_const then "SCONST" else "CONST"
else
if is_small !Clflags.option_small_data then "SDATA" else "DATA" in
default_use_section id sect
(* #pragma reserve_register *)
let process_reserve_register_pragma name =
match Machregsaux.register_by_name name with
| None ->
C2Clight.error "unknown register in `reserve_register' pragma"
| Some r ->
if Machregsaux.can_reserve_register r then
Coloringaux.reserved_registers :=
r :: !Coloringaux.reserved_registers
else
C2Clight.error "cannot reserve this register (not a callee-save)"
(* Parsing of pragmas using regexps *)
let re_start_pragma_section = Str.regexp "section\\b"
let re_pragma_section = Str.regexp(
"section[ \t]+"
^ "\\([A-Za-z_][A-Za-z_0-9]*\\)[ \t]+" (* class_name *)
^ "\\(\"[^\"]*\"\\)?[ \t]*" (* istring *)
^ "\\(\"[^\"]*\"\\)?[ \t]*" (* ustring *)
^ "\\(standard\\|near-absolute\\|far-absolute\\|near-data\\|far-data\\|near-code\\|far-code\\)?[ \t]*" (* addressing mode *)
^ "\\([RWXON]*\\)" (* access mode *)
)
let re_start_pragma_use_section = Str.regexp "use_section\\b"
let re_pragma_use_section = Str.regexp
"use_section[ \t]+\
\\([A-Za-z_][A-Za-z_0-9]*\\)[ \t]+\
\\(.*\\)$"
let re_split_idents = Str.regexp "[ \t,]+"
let re_start_pragma_reserve_register = Str.regexp "reserve_register\\b"
let re_pragma_reserve_register = Str.regexp
"reserve_register[ \t]+\\([A-Za-z0-9]+\\)"
let process_pragma name =
if Str.string_match re_pragma_section name 0 then begin
process_section_pragma
(Str.matched_group 1 name) (* classname *)
(Str.matched_group 2 name) (* istring *)
(Str.matched_group 3 name) (* ustring *)
(Str.matched_group 4 name) (* addrmode *)
(Str.matched_group 5 name); (* accmode *)
true
end else if Str.string_match re_start_pragma_section name 0 then
(C2Clight.error "ill-formed `section' pragma"; true)
else if Str.string_match re_pragma_use_section name 0 then begin
let classname = Str.matched_group 1 name
and idents = Str.matched_group 2 name in
let identlist = Str.split re_split_idents idents in
if identlist = [] then C2Clight.warning "vacuous `use_section' pragma";
List.iter (process_use_section_pragma classname) identlist;
true
end else if Str.string_match re_start_pragma_use_section name 0 then begin
C2Clight.error "ill-formed `use_section' pragma"; true
end else if Str.string_match re_pragma_reserve_register name 0 then begin
process_reserve_register_pragma (Str.matched_group 1 name); true
end else if Str.string_match re_start_pragma_reserve_register name 0 then begin
C2Clight.error "ill-formed `reserve_register' pragma"; true
end else
false
let initialize () =
C2Clight.process_pragma_hook := process_pragma;
C2Clight.define_variable_hook := define_variable;
C2Clight.define_function_hook := define_function;
C2Clight.define_stringlit_hook := define_stringlit
(* PowerPC-specific: say if an atom is in a small data area *)
let atom_is_small_data a ofs =
match C2Clight.atom_sizeof a with
| None -> false
| Some sz ->
let ofs = camlint_of_coqint ofs in
if ofs >= 0l && ofs < Int32.of_int sz then begin
try
(Hashtbl.find use_section_table a).sec_near_access
with Not_found ->
if C2Clight.atom_is_readonly a
then sz <= !Clflags.option_small_const
else sz <= !Clflags.option_small_data
end else
false
(* PowerPC-specific: determine section to use for a particular symbol *)
let section_for_atom a init =
try
let sinfo = Hashtbl.find use_section_table a in
let sname =
if init then sinfo.sec_name_init else sinfo.sec_name_uninit in
if not (String.contains sname '\"') then
Some sname
else begin
(* The following is Diab-specific... *)
let accmode = sinfo.sec_acc_mode in
let is_writable = String.contains accmode 'W'
and is_executable = String.contains accmode 'X' in
let stype =
match is_writable, is_executable with
| true, true -> 'm' (* text+data *)
| true, false -> 'd' (* data *)
| false, true -> 'c' (* text *)
| false, false -> 'r' (* const *)
in Some(sprintf ".section\t%s,,%c" sname stype)
end
with Not_found -> None
|
