mirror of
https://github.com/go-gitea/gitea.git
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580 lines
15 KiB
Perl
580 lines
15 KiB
Perl
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#!/usr/bin/env perl
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# Copyright 2018 The Go Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style
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# license that can be found in the LICENSE file.
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# This program reads a file containing function prototypes
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# (like syscall_aix.go) and generates system call bodies.
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# The prototypes are marked by lines beginning with "//sys"
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# and read like func declarations if //sys is replaced by func, but:
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# * The parameter lists must give a name for each argument.
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# This includes return parameters.
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# * The parameter lists must give a type for each argument:
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# the (x, y, z int) shorthand is not allowed.
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# * If the return parameter is an error number, it must be named err.
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# * If go func name needs to be different than its libc name,
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# * or the function is not in libc, name could be specified
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# * at the end, after "=" sign, like
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# //sys getsockopt(s int, level int, name int, val uintptr, vallen *_Socklen) (err error) = libsocket.getsockopt
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# This program will generate three files and handle both gc and gccgo implementation:
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# - zsyscall_aix_ppc64.go: the common part of each implementation (error handler, pointer creation)
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# - zsyscall_aix_ppc64_gc.go: gc part with //go_cgo_import_dynamic and a call to syscall6
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# - zsyscall_aix_ppc64_gccgo.go: gccgo part with C function and conversion to C type.
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# The generated code looks like this
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#
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# zsyscall_aix_ppc64.go
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# func asyscall(...) (n int, err error) {
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# // Pointer Creation
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# r1, e1 := callasyscall(...)
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# // Type Conversion
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# // Error Handler
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# return
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# }
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#
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# zsyscall_aix_ppc64_gc.go
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# //go:cgo_import_dynamic libc_asyscall asyscall "libc.a/shr_64.o"
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# //go:linkname libc_asyscall libc_asyscall
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# var asyscall syscallFunc
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#
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# func callasyscall(...) (r1 uintptr, e1 Errno) {
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# r1, _, e1 = syscall6(uintptr(unsafe.Pointer(&libc_asyscall)), "nb_args", ... )
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# return
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# }
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#
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# zsyscall_aix_ppc64_ggcgo.go
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# /*
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# int asyscall(...)
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#
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# */
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# import "C"
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#
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# func callasyscall(...) (r1 uintptr, e1 Errno) {
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# r1 = uintptr(C.asyscall(...))
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# e1 = syscall.GetErrno()
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# return
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# }
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use strict;
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my $cmdline = "mksyscall_aix_ppc64.pl " . join(' ', @ARGV);
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my $errors = 0;
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my $_32bit = "";
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my $tags = ""; # build tags
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my $aix = 0;
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my $solaris = 0;
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binmode STDOUT;
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if($ARGV[0] eq "-b32") {
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$_32bit = "big-endian";
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shift;
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} elsif($ARGV[0] eq "-l32") {
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$_32bit = "little-endian";
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shift;
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}
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if($ARGV[0] eq "-aix") {
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$aix = 1;
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shift;
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}
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if($ARGV[0] eq "-tags") {
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shift;
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$tags = $ARGV[0];
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shift;
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}
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if($ARGV[0] =~ /^-/) {
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print STDERR "usage: mksyscall_aix.pl [-b32 | -l32] [-tags x,y] [file ...]\n";
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exit 1;
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}
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sub parseparamlist($) {
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my ($list) = @_;
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$list =~ s/^\s*//;
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$list =~ s/\s*$//;
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if($list eq "") {
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return ();
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}
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return split(/\s*,\s*/, $list);
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}
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sub parseparam($) {
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my ($p) = @_;
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if($p !~ /^(\S*) (\S*)$/) {
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print STDERR "$ARGV:$.: malformed parameter: $p\n";
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$errors = 1;
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return ("xx", "int");
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}
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return ($1, $2);
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}
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my $package = "";
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# GCCGO
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my $textgccgo = "";
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my $c_extern = "/*\n#include <stdint.h>\n";
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# GC
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my $textgc = "";
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my $dynimports = "";
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my $linknames = "";
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my @vars = ();
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# COMMUN
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my $textcommon = "";
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while(<>) {
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chomp;
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s/\s+/ /g;
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s/^\s+//;
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s/\s+$//;
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$package = $1 if !$package && /^package (\S+)$/;
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my $nonblock = /^\/\/sysnb /;
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next if !/^\/\/sys / && !$nonblock;
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# Line must be of the form
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# func Open(path string, mode int, perm int) (fd int, err error)
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# Split into name, in params, out params.
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if(!/^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*(?:(\w*)\.)?(\w*))?$/) {
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print STDERR "$ARGV:$.: malformed //sys declaration\n";
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$errors = 1;
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next;
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}
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my ($nb, $func, $in, $out, $modname, $sysname) = ($1, $2, $3, $4, $5, $6);
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# Split argument lists on comma.
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my @in = parseparamlist($in);
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my @out = parseparamlist($out);
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$in = join(', ', @in);
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$out = join(', ', @out);
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if($sysname eq "") {
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$sysname = "$func";
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}
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my $onlyCommon = 0;
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if ($func eq "readlen" || $func eq "writelen" || $func eq "FcntlInt" || $func eq "FcntlFlock") {
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# This function call another syscall which is already implemented.
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# Therefore, the gc and gccgo part must not be generated.
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$onlyCommon = 1
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}
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# Try in vain to keep people from editing this file.
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# The theory is that they jump into the middle of the file
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# without reading the header.
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$textcommon .= "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n";
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if (!$onlyCommon) {
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$textgccgo .= "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n";
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$textgc .= "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n";
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}
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# Check if value return, err return available
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my $errvar = "";
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my $retvar = "";
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my $rettype = "";
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foreach my $p (@out) {
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my ($name, $type) = parseparam($p);
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if($type eq "error") {
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$errvar = $name;
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} else {
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$retvar = $name;
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$rettype = $type;
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}
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}
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$sysname =~ s/([a-z])([A-Z])/${1}_$2/g;
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$sysname =~ y/A-Z/a-z/; # All libc functions are lowercase.
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# GCCGO Prototype return type
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my $C_rettype = "";
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if($rettype eq "unsafe.Pointer") {
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$C_rettype = "uintptr_t";
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} elsif($rettype eq "uintptr") {
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$C_rettype = "uintptr_t";
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} elsif($rettype =~ /^_/) {
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$C_rettype = "uintptr_t";
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} elsif($rettype eq "int") {
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$C_rettype = "int";
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} elsif($rettype eq "int32") {
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$C_rettype = "int";
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} elsif($rettype eq "int64") {
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$C_rettype = "long long";
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} elsif($rettype eq "uint32") {
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$C_rettype = "unsigned int";
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} elsif($rettype eq "uint64") {
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$C_rettype = "unsigned long long";
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} else {
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$C_rettype = "int";
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}
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if($sysname eq "exit") {
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$C_rettype = "void";
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}
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# GCCGO Prototype arguments type
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my @c_in = ();
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foreach my $i (0 .. $#in) {
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my ($name, $type) = parseparam($in[$i]);
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if($type =~ /^\*/) {
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push @c_in, "uintptr_t";
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} elsif($type eq "string") {
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push @c_in, "uintptr_t";
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} elsif($type =~ /^\[\](.*)/) {
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push @c_in, "uintptr_t", "size_t";
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} elsif($type eq "unsafe.Pointer") {
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push @c_in, "uintptr_t";
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} elsif($type eq "uintptr") {
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push @c_in, "uintptr_t";
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} elsif($type =~ /^_/) {
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push @c_in, "uintptr_t";
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} elsif($type eq "int") {
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if (($i == 0 || $i == 2) && $func eq "fcntl"){
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# These fcntl arguments needs to be uintptr to be able to call FcntlInt and FcntlFlock
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push @c_in, "uintptr_t";
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} else {
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push @c_in, "int";
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}
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} elsif($type eq "int32") {
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push @c_in, "int";
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} elsif($type eq "int64") {
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push @c_in, "long long";
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} elsif($type eq "uint32") {
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push @c_in, "unsigned int";
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} elsif($type eq "uint64") {
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push @c_in, "unsigned long long";
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} else {
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push @c_in, "int";
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}
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}
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if (!$onlyCommon){
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# GCCGO Prototype Generation
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# Imports of system calls from libc
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$c_extern .= "$C_rettype $sysname";
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my $c_in = join(', ', @c_in);
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$c_extern .= "($c_in);\n";
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}
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# GC Library name
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if($modname eq "") {
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$modname = "libc.a/shr_64.o";
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} else {
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print STDERR "$func: only syscall using libc are available\n";
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$errors = 1;
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next;
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}
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my $sysvarname = "libc_${sysname}";
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if (!$onlyCommon){
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# GC Runtime import of function to allow cross-platform builds.
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$dynimports .= "//go:cgo_import_dynamic ${sysvarname} ${sysname} \"$modname\"\n";
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# GC Link symbol to proc address variable.
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$linknames .= "//go:linkname ${sysvarname} ${sysvarname}\n";
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# GC Library proc address variable.
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push @vars, $sysvarname;
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}
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my $strconvfunc ="BytePtrFromString";
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my $strconvtype = "*byte";
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# Go function header.
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if($out ne "") {
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$out = " ($out)";
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}
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if($textcommon ne "") {
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$textcommon .= "\n"
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}
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$textcommon .= sprintf "func %s(%s)%s {\n", $func, join(', ', @in), $out ;
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# Prepare arguments to call.
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my @argscommun = (); # Arguments in the commun part
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my @argscall = (); # Arguments for call prototype
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my @argsgc = (); # Arguments for gc call (with syscall6)
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my @argsgccgo = (); # Arguments for gccgo call (with C.name_of_syscall)
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my $n = 0;
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my $arg_n = 0;
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foreach my $p (@in) {
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my ($name, $type) = parseparam($p);
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if($type =~ /^\*/) {
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push @argscommun, "uintptr(unsafe.Pointer($name))";
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push @argscall, "$name uintptr";
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push @argsgc, "$name";
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push @argsgccgo, "C.uintptr_t($name)";
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} elsif($type eq "string" && $errvar ne "") {
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$textcommon .= "\tvar _p$n $strconvtype\n";
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$textcommon .= "\t_p$n, $errvar = $strconvfunc($name)\n";
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$textcommon .= "\tif $errvar != nil {\n\t\treturn\n\t}\n";
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push @argscommun, "uintptr(unsafe.Pointer(_p$n))";
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push @argscall, "_p$n uintptr ";
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push @argsgc, "_p$n";
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push @argsgccgo, "C.uintptr_t(_p$n)";
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$n++;
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} elsif($type eq "string") {
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print STDERR "$ARGV:$.: $func uses string arguments, but has no error return\n";
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$textcommon .= "\tvar _p$n $strconvtype\n";
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$textcommon .= "\t_p$n, $errvar = $strconvfunc($name)\n";
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$textcommon .= "\tif $errvar != nil {\n\t\treturn\n\t}\n";
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push @argscommun, "uintptr(unsafe.Pointer(_p$n))";
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push @argscall, "_p$n uintptr";
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push @argsgc, "_p$n";
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push @argsgccgo, "C.uintptr_t(_p$n)";
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$n++;
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} elsif($type =~ /^\[\](.*)/) {
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# Convert slice into pointer, length.
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# Have to be careful not to take address of &a[0] if len == 0:
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# pass nil in that case.
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$textcommon .= "\tvar _p$n *$1\n";
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$textcommon .= "\tif len($name) > 0 {\n\t\t_p$n = \&$name\[0]\n\t}\n";
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push @argscommun, "uintptr(unsafe.Pointer(_p$n))", "len($name)";
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push @argscall, "_p$n uintptr", "_lenp$n int";
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push @argsgc, "_p$n", "uintptr(_lenp$n)";
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push @argsgccgo, "C.uintptr_t(_p$n)", "C.size_t(_lenp$n)";
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$n++;
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} elsif($type eq "int64" && $_32bit ne "") {
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print STDERR "$ARGV:$.: $func uses int64 with 32 bits mode. Case not yet implemented\n";
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# if($_32bit eq "big-endian") {
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# push @args, "uintptr($name >> 32)", "uintptr($name)";
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# } else {
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# push @args, "uintptr($name)", "uintptr($name >> 32)";
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# }
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# $n++;
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} elsif($type eq "bool") {
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print STDERR "$ARGV:$.: $func uses bool. Case not yet implemented\n";
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# $text .= "\tvar _p$n uint32\n";
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# $text .= "\tif $name {\n\t\t_p$n = 1\n\t} else {\n\t\t_p$n = 0\n\t}\n";
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# push @args, "_p$n";
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# $n++;
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} elsif($type =~ /^_/ ||$type eq "unsafe.Pointer") {
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push @argscommun, "uintptr($name)";
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push @argscall, "$name uintptr";
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push @argsgc, "$name";
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push @argsgccgo, "C.uintptr_t($name)";
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} elsif($type eq "int") {
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if (($arg_n == 0 || $arg_n == 2) && ($func eq "fcntl" || $func eq "FcntlInt" || $func eq "FcntlFlock")) {
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# These fcntl arguments need to be uintptr to be able to call FcntlInt and FcntlFlock
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push @argscommun, "uintptr($name)";
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push @argscall, "$name uintptr";
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push @argsgc, "$name";
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push @argsgccgo, "C.uintptr_t($name)";
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} else {
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push @argscommun, "$name";
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push @argscall, "$name int";
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push @argsgc, "uintptr($name)";
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push @argsgccgo, "C.int($name)";
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}
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} elsif($type eq "int32") {
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push @argscommun, "$name";
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push @argscall, "$name int32";
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push @argsgc, "uintptr($name)";
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push @argsgccgo, "C.int($name)";
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} elsif($type eq "int64") {
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push @argscommun, "$name";
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push @argscall, "$name int64";
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push @argsgc, "uintptr($name)";
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push @argsgccgo, "C.longlong($name)";
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} elsif($type eq "uint32") {
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push @argscommun, "$name";
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push @argscall, "$name uint32";
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push @argsgc, "uintptr($name)";
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push @argsgccgo, "C.uint($name)";
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} elsif($type eq "uint64") {
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push @argscommun, "$name";
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||
|
push @argscall, "$name uint64";
|
||
|
push @argsgc, "uintptr($name)";
|
||
|
push @argsgccgo, "C.ulonglong($name)";
|
||
|
} elsif($type eq "uintptr") {
|
||
|
push @argscommun, "$name";
|
||
|
push @argscall, "$name uintptr";
|
||
|
push @argsgc, "$name";
|
||
|
push @argsgccgo, "C.uintptr_t($name)";
|
||
|
} else {
|
||
|
push @argscommun, "int($name)";
|
||
|
push @argscall, "$name int";
|
||
|
push @argsgc, "uintptr($name)";
|
||
|
push @argsgccgo, "C.int($name)";
|
||
|
}
|
||
|
$arg_n++;
|
||
|
}
|
||
|
my $nargs = @argsgc;
|
||
|
|
||
|
# COMMUN function generation
|
||
|
my $argscommun = join(', ', @argscommun);
|
||
|
my $callcommun = "call$sysname($argscommun)";
|
||
|
my @ret = ("_", "_");
|
||
|
my $body = "";
|
||
|
my $do_errno = 0;
|
||
|
for(my $i=0; $i<@out; $i++) {
|
||
|
my $p = $out[$i];
|
||
|
my ($name, $type) = parseparam($p);
|
||
|
my $reg = "";
|
||
|
if($name eq "err") {
|
||
|
$reg = "e1";
|
||
|
$ret[1] = $reg;
|
||
|
$do_errno = 1;
|
||
|
} else {
|
||
|
$reg = "r0";
|
||
|
$ret[0] = $reg;
|
||
|
}
|
||
|
if($type eq "bool") {
|
||
|
$reg = "$reg != 0";
|
||
|
}
|
||
|
if($reg ne "e1") {
|
||
|
$body .= "\t$name = $type($reg)\n";
|
||
|
}
|
||
|
}
|
||
|
if ($ret[0] eq "_" && $ret[1] eq "_") {
|
||
|
$textcommon .= "\t$callcommun\n";
|
||
|
} else {
|
||
|
$textcommon .= "\t$ret[0], $ret[1] := $callcommun\n";
|
||
|
}
|
||
|
$textcommon .= $body;
|
||
|
|
||
|
if ($do_errno) {
|
||
|
$textcommon .= "\tif e1 != 0 {\n";
|
||
|
$textcommon .= "\t\terr = errnoErr(e1)\n";
|
||
|
$textcommon .= "\t}\n";
|
||
|
}
|
||
|
$textcommon .= "\treturn\n";
|
||
|
$textcommon .= "}\n";
|
||
|
|
||
|
if ($onlyCommon){
|
||
|
next
|
||
|
}
|
||
|
# CALL Prototype
|
||
|
my $callProto = sprintf "func call%s(%s) (r1 uintptr, e1 Errno) {\n", $sysname, join(', ', @argscall);
|
||
|
|
||
|
# GC function generation
|
||
|
my $asm = "syscall6";
|
||
|
if ($nonblock) {
|
||
|
$asm = "rawSyscall6";
|
||
|
}
|
||
|
|
||
|
if(@argsgc <= 6) {
|
||
|
while(@argsgc < 6) {
|
||
|
push @argsgc, "0";
|
||
|
}
|
||
|
} else {
|
||
|
print STDERR "$ARGV:$.: too many arguments to system call\n";
|
||
|
}
|
||
|
my $argsgc = join(', ', @argsgc);
|
||
|
my $callgc = "$asm(uintptr(unsafe.Pointer(&$sysvarname)), $nargs, $argsgc)";
|
||
|
|
||
|
$textgc .= $callProto;
|
||
|
$textgc .= "\tr1, _, e1 = $callgc\n";
|
||
|
$textgc .= "\treturn\n}\n";
|
||
|
|
||
|
# GCCGO function generation
|
||
|
my $argsgccgo = join(', ', @argsgccgo);
|
||
|
my $callgccgo = "C.$sysname($argsgccgo)";
|
||
|
$textgccgo .= $callProto;
|
||
|
$textgccgo .= "\tr1 = uintptr($callgccgo)\n";
|
||
|
$textgccgo .= "\te1 = syscall.GetErrno()\n";
|
||
|
$textgccgo .= "\treturn\n}\n";
|
||
|
}
|
||
|
|
||
|
if($errors) {
|
||
|
exit 1;
|
||
|
}
|
||
|
|
||
|
# Print zsyscall_aix_ppc64.go
|
||
|
open(my $fcommun, '>', 'zsyscall_aix_ppc64.go');
|
||
|
my $tofcommun = <<EOF;
|
||
|
// $cmdline
|
||
|
// Code generated by the command above; see README.md. DO NOT EDIT.
|
||
|
|
||
|
// +build $tags
|
||
|
|
||
|
package $package
|
||
|
|
||
|
import (
|
||
|
"unsafe"
|
||
|
)
|
||
|
|
||
|
EOF
|
||
|
|
||
|
$tofcommun .= "import \"golang.org/x/sys/unix\"\n" if $package ne "unix";
|
||
|
|
||
|
$tofcommun .=<<EOF;
|
||
|
|
||
|
$textcommon
|
||
|
EOF
|
||
|
print $fcommun $tofcommun;
|
||
|
|
||
|
|
||
|
# Print zsyscall_aix_ppc64_gc.go
|
||
|
open(my $fgc, '>', 'zsyscall_aix_ppc64_gc.go');
|
||
|
my $tofgc = <<EOF;
|
||
|
// $cmdline
|
||
|
// Code generated by the command above; see README.md. DO NOT EDIT.
|
||
|
|
||
|
// +build $tags
|
||
|
// +build !gccgo
|
||
|
|
||
|
package $package
|
||
|
|
||
|
import (
|
||
|
"unsafe"
|
||
|
)
|
||
|
|
||
|
|
||
|
EOF
|
||
|
|
||
|
$tofgc .= "import \"golang.org/x/sys/unix\"\n" if $package ne "unix";
|
||
|
|
||
|
my $vardecls = "\t" . join(",\n\t", @vars);
|
||
|
$vardecls .= " syscallFunc";
|
||
|
|
||
|
$tofgc .=<<EOF;
|
||
|
$dynimports
|
||
|
$linknames
|
||
|
type syscallFunc uintptr
|
||
|
|
||
|
var (
|
||
|
$vardecls
|
||
|
)
|
||
|
|
||
|
// Implemented in runtime/syscall_aix.go.
|
||
|
func rawSyscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
|
||
|
func syscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
|
||
|
|
||
|
$textgc
|
||
|
EOF
|
||
|
print $fgc $tofgc;
|
||
|
|
||
|
# Print zsyscall_aix_ppc64_gc.go
|
||
|
open(my $fgccgo, '>', 'zsyscall_aix_ppc64_gccgo.go');
|
||
|
my $tofgccgo = <<EOF;
|
||
|
// $cmdline
|
||
|
// Code generated by the command above; see README.md. DO NOT EDIT.
|
||
|
|
||
|
// +build $tags
|
||
|
// +build gccgo
|
||
|
|
||
|
package $package
|
||
|
|
||
|
|
||
|
$c_extern
|
||
|
*/
|
||
|
import "C"
|
||
|
import (
|
||
|
"syscall"
|
||
|
)
|
||
|
|
||
|
|
||
|
EOF
|
||
|
|
||
|
$tofgccgo .= "import \"golang.org/x/sys/unix\"\n" if $package ne "unix";
|
||
|
|
||
|
$tofgccgo .=<<EOF;
|
||
|
|
||
|
$textgccgo
|
||
|
EOF
|
||
|
print $fgccgo $tofgccgo;
|
||
|
exit 0;
|