| #!/usr/bin/env perl |
| # Copyright 2018 The Go Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style |
| # license that can be found in the LICENSE file. |
| |
| # This program reads a file containing function prototypes |
| # (like syscall_aix.go) and generates system call bodies. |
| # The prototypes are marked by lines beginning with "//sys" |
| # and read like func declarations if //sys is replaced by func, but: |
| # * The parameter lists must give a name for each argument. |
| # This includes return parameters. |
| # * The parameter lists must give a type for each argument: |
| # the (x, y, z int) shorthand is not allowed. |
| # * If the return parameter is an error number, it must be named err. |
| # * If go func name needs to be different than its libc name, |
| # * or the function is not in libc, name could be specified |
| # * at the end, after "=" sign, like |
| # //sys getsockopt(s int, level int, name int, val uintptr, vallen *_Socklen) (err error) = libsocket.getsockopt |
| |
| use strict; |
| |
| my $cmdline = "mksyscall_aix_ppc.pl " . join(' ', @ARGV); |
| my $errors = 0; |
| my $_32bit = ""; |
| my $tags = ""; # build tags |
| my $aix = 0; |
| my $solaris = 0; |
| |
| binmode STDOUT; |
| |
| if($ARGV[0] eq "-b32") { |
| $_32bit = "big-endian"; |
| shift; |
| } elsif($ARGV[0] eq "-l32") { |
| $_32bit = "little-endian"; |
| shift; |
| } |
| if($ARGV[0] eq "-aix") { |
| $aix = 1; |
| shift; |
| } |
| if($ARGV[0] eq "-tags") { |
| shift; |
| $tags = $ARGV[0]; |
| shift; |
| } |
| |
| if($ARGV[0] =~ /^-/) { |
| print STDERR "usage: mksyscall_aix.pl [-b32 | -l32] [-tags x,y] [file ...]\n"; |
| exit 1; |
| } |
| |
| sub parseparamlist($) { |
| my ($list) = @_; |
| $list =~ s/^\s*//; |
| $list =~ s/\s*$//; |
| if($list eq "") { |
| return (); |
| } |
| return split(/\s*,\s*/, $list); |
| } |
| |
| sub parseparam($) { |
| my ($p) = @_; |
| if($p !~ /^(\S*) (\S*)$/) { |
| print STDERR "$ARGV:$.: malformed parameter: $p\n"; |
| $errors = 1; |
| return ("xx", "int"); |
| } |
| return ($1, $2); |
| } |
| |
| my $package = ""; |
| my $text = ""; |
| my $c_extern = "/*\n#include <stdint.h>\n#include <stddef.h>\n"; |
| my @vars = (); |
| while(<>) { |
| chomp; |
| s/\s+/ /g; |
| s/^\s+//; |
| s/\s+$//; |
| $package = $1 if !$package && /^package (\S+)$/; |
| my $nonblock = /^\/\/sysnb /; |
| next if !/^\/\/sys / && !$nonblock; |
| |
| # Line must be of the form |
| # func Open(path string, mode int, perm int) (fd int, err error) |
| # Split into name, in params, out params. |
| if(!/^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*(?:(\w*)\.)?(\w*))?$/) { |
| print STDERR "$ARGV:$.: malformed //sys declaration\n"; |
| $errors = 1; |
| next; |
| } |
| my ($nb, $func, $in, $out, $modname, $sysname) = ($1, $2, $3, $4, $5, $6); |
| |
| # Split argument lists on comma. |
| my @in = parseparamlist($in); |
| my @out = parseparamlist($out); |
| |
| $in = join(', ', @in); |
| $out = join(', ', @out); |
| |
| # Try in vain to keep people from editing this file. |
| # The theory is that they jump into the middle of the file |
| # without reading the header. |
| $text .= "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n"; |
| |
| # Check if value return, err return available |
| my $errvar = ""; |
| my $retvar = ""; |
| my $rettype = ""; |
| foreach my $p (@out) { |
| my ($name, $type) = parseparam($p); |
| if($type eq "error") { |
| $errvar = $name; |
| } else { |
| $retvar = $name; |
| $rettype = $type; |
| } |
| } |
| |
| # System call name. |
| #if($func ne "fcntl") { |
| |
| if($sysname eq "") { |
| $sysname = "$func"; |
| } |
| |
| $sysname =~ s/([a-z])([A-Z])/${1}_$2/g; |
| $sysname =~ y/A-Z/a-z/; # All libc functions are lowercase. |
| |
| my $C_rettype = ""; |
| if($rettype eq "unsafe.Pointer") { |
| $C_rettype = "uintptr_t"; |
| } elsif($rettype eq "uintptr") { |
| $C_rettype = "uintptr_t"; |
| } elsif($rettype =~ /^_/) { |
| $C_rettype = "uintptr_t"; |
| } elsif($rettype eq "int") { |
| $C_rettype = "int"; |
| } elsif($rettype eq "int32") { |
| $C_rettype = "int"; |
| } elsif($rettype eq "int64") { |
| $C_rettype = "long long"; |
| } elsif($rettype eq "uint32") { |
| $C_rettype = "unsigned int"; |
| } elsif($rettype eq "uint64") { |
| $C_rettype = "unsigned long long"; |
| } else { |
| $C_rettype = "int"; |
| } |
| if($sysname eq "exit") { |
| $C_rettype = "void"; |
| } |
| |
| # Change types to c |
| my @c_in = (); |
| foreach my $p (@in) { |
| my ($name, $type) = parseparam($p); |
| if($type =~ /^\*/) { |
| push @c_in, "uintptr_t"; |
| } elsif($type eq "string") { |
| push @c_in, "uintptr_t"; |
| } elsif($type =~ /^\[\](.*)/) { |
| push @c_in, "uintptr_t", "size_t"; |
| } elsif($type eq "unsafe.Pointer") { |
| push @c_in, "uintptr_t"; |
| } elsif($type eq "uintptr") { |
| push @c_in, "uintptr_t"; |
| } elsif($type =~ /^_/) { |
| push @c_in, "uintptr_t"; |
| } elsif($type eq "int") { |
| push @c_in, "int"; |
| } elsif($type eq "int32") { |
| push @c_in, "int"; |
| } elsif($type eq "int64") { |
| push @c_in, "long long"; |
| } elsif($type eq "uint32") { |
| push @c_in, "unsigned int"; |
| } elsif($type eq "uint64") { |
| push @c_in, "unsigned long long"; |
| } else { |
| push @c_in, "int"; |
| } |
| } |
| |
| if ($func ne "fcntl" && $func ne "FcntlInt" && $func ne "readlen" && $func ne "writelen") { |
| # Imports of system calls from libc |
| $c_extern .= "$C_rettype $sysname"; |
| my $c_in = join(', ', @c_in); |
| $c_extern .= "($c_in);\n"; |
| } |
| |
| # So file name. |
| if($aix) { |
| if($modname eq "") { |
| $modname = "libc.a/shr_64.o"; |
| } else { |
| print STDERR "$func: only syscall using libc are available\n"; |
| $errors = 1; |
| next; |
| } |
| } |
| |
| my $strconvfunc = "C.CString"; |
| my $strconvtype = "*byte"; |
| |
| # Go function header. |
| if($out ne "") { |
| $out = " ($out)"; |
| } |
| if($text ne "") { |
| $text .= "\n" |
| } |
| |
| $text .= sprintf "func %s(%s)%s {\n", $func, join(', ', @in), $out ; |
| |
| # Prepare arguments to call. |
| my @args = (); |
| my $n = 0; |
| my $arg_n = 0; |
| foreach my $p (@in) { |
| my ($name, $type) = parseparam($p); |
| if($type =~ /^\*/) { |
| push @args, "C.uintptr_t(uintptr(unsafe.Pointer($name)))"; |
| } elsif($type eq "string" && $errvar ne "") { |
| $text .= "\t_p$n := uintptr(unsafe.Pointer($strconvfunc($name)))\n"; |
| push @args, "C.uintptr_t(_p$n)"; |
| $n++; |
| } elsif($type eq "string") { |
| print STDERR "$ARGV:$.: $func uses string arguments, but has no error return\n"; |
| $text .= "\t_p$n := uintptr(unsafe.Pointer($strconvfunc($name)))\n"; |
| push @args, "C.uintptr_t(_p$n)"; |
| $n++; |
| } elsif($type =~ /^\[\](.*)/) { |
| # Convert slice into pointer, length. |
| # Have to be careful not to take address of &a[0] if len == 0: |
| # pass nil in that case. |
| $text .= "\tvar _p$n *$1\n"; |
| $text .= "\tif len($name) > 0 {\n\t\t_p$n = \&$name\[0]\n\t}\n"; |
| push @args, "C.uintptr_t(uintptr(unsafe.Pointer(_p$n)))"; |
| $n++; |
| $text .= "\tvar _p$n int\n"; |
| $text .= "\t_p$n = len($name)\n"; |
| push @args, "C.size_t(_p$n)"; |
| $n++; |
| } elsif($type eq "int64" && $_32bit ne "") { |
| if($_32bit eq "big-endian") { |
| push @args, "uintptr($name >> 32)", "uintptr($name)"; |
| } else { |
| push @args, "uintptr($name)", "uintptr($name >> 32)"; |
| } |
| $n++; |
| } elsif($type eq "bool") { |
| $text .= "\tvar _p$n uint32\n"; |
| $text .= "\tif $name {\n\t\t_p$n = 1\n\t} else {\n\t\t_p$n = 0\n\t}\n"; |
| push @args, "_p$n"; |
| $n++; |
| } elsif($type =~ /^_/) { |
| push @args, "C.uintptr_t(uintptr($name))"; |
| } elsif($type eq "unsafe.Pointer") { |
| push @args, "C.uintptr_t(uintptr($name))"; |
| } elsif($type eq "int") { |
| if (($arg_n == 2) && (($func eq "readlen") || ($func eq "writelen"))) { |
| push @args, "C.size_t($name)"; |
| } elsif ($arg_n == 0 && $func eq "fcntl") { |
| push @args, "C.uintptr_t($name)"; |
| } elsif (($arg_n == 2) && (($func eq "fcntl") || ($func eq "FcntlInt"))) { |
| push @args, "C.uintptr_t($name)"; |
| } else { |
| push @args, "C.int($name)"; |
| } |
| } elsif($type eq "int32") { |
| push @args, "C.int($name)"; |
| } elsif($type eq "int64") { |
| push @args, "C.longlong($name)"; |
| } elsif($type eq "uint32") { |
| push @args, "C.uint($name)"; |
| } elsif($type eq "uint64") { |
| push @args, "C.ulonglong($name)"; |
| } elsif($type eq "uintptr") { |
| push @args, "C.uintptr_t($name)"; |
| } else { |
| push @args, "C.int($name)"; |
| } |
| $arg_n++; |
| } |
| my $nargs = @args; |
| |
| |
| # Determine which form to use; pad args with zeros. |
| if ($nonblock) { |
| } |
| |
| my $args = join(', ', @args); |
| my $call = ""; |
| if ($sysname eq "exit") { |
| if ($errvar ne "") { |
| $call .= "er :="; |
| } else { |
| $call .= ""; |
| } |
| } elsif ($errvar ne "") { |
| $call .= "r0,er :="; |
| } elsif ($retvar ne "") { |
| $call .= "r0,_ :="; |
| } else { |
| $call .= "" |
| } |
| $call .= "C.$sysname($args)"; |
| |
| # Assign return values. |
| my $body = ""; |
| my $failexpr = ""; |
| |
| for(my $i=0; $i<@out; $i++) { |
| my $p = $out[$i]; |
| my ($name, $type) = parseparam($p); |
| my $reg = ""; |
| if($name eq "err") { |
| $reg = "e1"; |
| } else { |
| $reg = "r0"; |
| } |
| if($reg ne "e1" ) { |
| $body .= "\t$name = $type($reg)\n"; |
| } |
| } |
| |
| # verify return |
| if ($sysname ne "exit" && $errvar ne "") { |
| if ($C_rettype =~ /^uintptr/) { |
| $body .= "\tif \(uintptr\(r0\) ==\^uintptr\(0\) && er != nil\) {\n"; |
| $body .= "\t\t$errvar = er\n"; |
| $body .= "\t}\n"; |
| } else { |
| $body .= "\tif \(r0 ==-1 && er != nil\) {\n"; |
| $body .= "\t\t$errvar = er\n"; |
| $body .= "\t}\n"; |
| } |
| } elsif ($errvar ne "") { |
| $body .= "\tif \(er != nil\) {\n"; |
| $body .= "\t\t$errvar = er\n"; |
| $body .= "\t}\n"; |
| } |
| |
| $text .= "\t$call\n"; |
| $text .= $body; |
| |
| $text .= "\treturn\n"; |
| $text .= "}\n"; |
| } |
| |
| if($errors) { |
| exit 1; |
| } |
| |
| print <<EOF; |
| // $cmdline |
| // Code generated by the command above; see README.md. DO NOT EDIT. |
| |
| // +build $tags |
| |
| package $package |
| |
| |
| $c_extern |
| */ |
| import "C" |
| import ( |
| "unsafe" |
| ) |
| |
| |
| EOF |
| |
| print "import \"golang.org/x/sys/unix\"\n" if $package ne "unix"; |
| |
| chomp($_=<<EOF); |
| |
| $text |
| EOF |
| print $_; |
| exit 0; |