301 lines
7.7 KiB
Awk
301 lines
7.7 KiB
Awk
# Copyright 2011 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 AWK script reads a Go file with comments describing syscall
|
|
# functions and the C routines they map to. It generates the Go code
|
|
# which calls the C routines.
|
|
|
|
# The syscall functins 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, it must be named err.
|
|
|
|
# A line beginning with //sysnb is like //sys, except that the
|
|
# goroutine will not be suspended during the execution of the library
|
|
# call. This must only be used for library calls which can never
|
|
# block, as otherwise the library call could cause all goroutines to
|
|
# hang.
|
|
|
|
# After the //sys or //sysnb line comes a second line which describes
|
|
# the C function. The name must be the name of the function in the C
|
|
# library, and may be the same as the Go function. The limitations on
|
|
# the argument list are the same as for the //sys line, but there must
|
|
# be at most one result parameter, and it must be given as just a
|
|
# type, without a name.
|
|
|
|
BEGIN {
|
|
print "// Code generated by mksyscall.awk. DO NOT EDIT."
|
|
print ""
|
|
print "package syscall"
|
|
print ""
|
|
print "import \"unsafe\""
|
|
print ""
|
|
status = 0
|
|
}
|
|
|
|
/^\/\/sys/ {
|
|
if ($1 == "//sysnb") {
|
|
blocking = 0
|
|
} else {
|
|
blocking = 1
|
|
}
|
|
|
|
line = $0
|
|
|
|
if (match(line, "//sys(nb)?[ ]*[a-zA-Z0-9_]+\\([^()]*\\) *(\\(([^()]+)\\))?") == 0) {
|
|
print "unmatched line:", $0 | "cat 1>&2"
|
|
status = 1
|
|
next
|
|
}
|
|
|
|
# Sets a[1] = //sysnb, a[2] == function name.
|
|
split(line, a, "[ (]+")
|
|
gofnname = a[2]
|
|
|
|
off = match(line, "\\([^()]*\\)")
|
|
end = index(substr(line, off, length(line) - off + 1), ")")
|
|
gofnparams = substr(line, off + 1, end - 2)
|
|
|
|
line = substr(line, off + end, length(line) - (off + end) + 1)
|
|
off = match(line, "\\([^()]*\\)")
|
|
if (off == 0) {
|
|
gofnresults = ""
|
|
} else {
|
|
end = index(substr(line, off, length(line) - off + 1), ")")
|
|
gofnresults = substr(line, off + 1, end - 2)
|
|
}
|
|
|
|
getline
|
|
line = $0
|
|
|
|
if (match(line, "//[a-zA-Z0-9_]+\\([^()]*\\)") == 0) {
|
|
print "unmatched C line", $0, "after", gofnname | "cat 1>&2"
|
|
status = 1
|
|
next
|
|
}
|
|
|
|
split(line, a, "[ (]+")
|
|
cfnname = substr(a[1], 3, length(a[1]) - 2)
|
|
|
|
off = match(line, "\\([^()]*\\)")
|
|
end = index(substr(line, off, length(line) - off + 1), ")")
|
|
cfnparams = substr(line, off + 1, end - 2)
|
|
|
|
line = substr(line, off + end + 1, length(line) - (off + end) + 1)
|
|
while (substr(line, 1, 1) == " ") {
|
|
line = substr(line, 2, length(line) - 1)
|
|
}
|
|
end = index(line, " ")
|
|
if (end != 0) {
|
|
line = substr(line, 1, end)
|
|
}
|
|
cfnresult = line
|
|
|
|
printf("// Automatically generated wrapper for %s/%s\n", gofnname, cfnname)
|
|
if (!(cfnname in cfns)) {
|
|
cfns[cfnname] = 1
|
|
printf("//go:noescape\n")
|
|
printf("//extern-sysinfo %s\n", cfnname)
|
|
printf("func c_%s(%s) %s\n", cfnname, cfnparams, cfnresult)
|
|
}
|
|
printf("func %s(%s) %s%s%s%s{\n",
|
|
gofnname, gofnparams, gofnresults == "" ? "" : "(", gofnresults,
|
|
gofnresults == "" ? "" : ")", gofnresults == "" ? "" : " ")
|
|
|
|
loc = gofnname "/" cfnname ":"
|
|
|
|
haserr = 0
|
|
if (gofnresults != "") {
|
|
fields = split(gofnresults, goresults, ", *")
|
|
for (goresult = 1; goresults[goresult] != ""; goresult++) {
|
|
if (split(goresults[goresult], goparam) == 2) {
|
|
if (goparam[1] == "err") {
|
|
haserr = 1
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
split(gofnparams, goargs, ", *")
|
|
split(cfnparams, cargs, ", *")
|
|
args = ""
|
|
carg = 1
|
|
for (goarg = 1; goargs[goarg] != ""; goarg++) {
|
|
if (cargs[carg] == "") {
|
|
print loc, "not enough C parameters"
|
|
}
|
|
|
|
if (args != "") {
|
|
args = args ", "
|
|
}
|
|
|
|
if (split(goargs[goarg], a) != 2) {
|
|
print loc, "bad parameter:", goargs[goarg] | "cat 1>&2"
|
|
status = 1
|
|
next
|
|
}
|
|
|
|
goname = a[1]
|
|
gotype = a[2]
|
|
|
|
if (split(cargs[carg], a) != 2) {
|
|
print loc, "bad C parameter:", cargs[carg] | "cat 1>&2"
|
|
status = 1
|
|
next
|
|
}
|
|
|
|
ctype = a[2]
|
|
|
|
if (gotype ~ /^\*/) {
|
|
if (gotype != ctype) {
|
|
print loc, "Go/C pointer type mismatch:", gotype, ctype | "cat 1>&2"
|
|
status = 1
|
|
next
|
|
}
|
|
args = args goname
|
|
} else if (gotype == "string") {
|
|
if (ctype != "*byte") {
|
|
print loc, "Go string not matched to C *byte:", gotype, ctype | "cat 1>&2"
|
|
status = 1
|
|
next
|
|
}
|
|
printf("\tvar _p%d *byte\n", goarg)
|
|
if (haserr) {
|
|
printf("\t_p%d, err = BytePtrFromString(%s)\n", goarg, goname)
|
|
printf("\tif err != nil {\n\t\treturn\n\t}\n")
|
|
} else {
|
|
print loc, "uses string arguments but has no error return" | "cat 1>&2"
|
|
printf("\t_p%d, _ = BytePtrFromString(%s)\n", goarg, goname)
|
|
}
|
|
args = sprintf("%s_p%d", args, goarg)
|
|
} else if (gotype ~ /^\[\](.*)/) {
|
|
if (ctype !~ /^\*/ || cargs[carg + 1] == "") {
|
|
print loc, "bad C type for slice:", gotype, ctype | "cat 1>&2"
|
|
status = 1
|
|
next
|
|
}
|
|
|
|
# Convert a slice into a pair of pointer, length.
|
|
# Don't try to take the address of the zeroth element of a
|
|
# nil slice.
|
|
printf("\tvar _p%d %s\n", goarg, ctype)
|
|
printf("\tif len(%s) > 0 {\n", goname)
|
|
printf("\t\t_p%d = (%s)(unsafe.Pointer(&%s[0]))\n", goarg, ctype, goname)
|
|
printf("\t} else {\n")
|
|
printf("\t\t_p%d = (%s)(unsafe.Pointer(&_zero))\n", goarg, ctype)
|
|
printf("\t}\n")
|
|
|
|
++carg
|
|
if (split(cargs[carg], cparam) != 2) {
|
|
print loc, "bad C parameter:", cargs[carg] | "cat 1>&2"
|
|
status = 1
|
|
next
|
|
}
|
|
|
|
args = sprintf("%s_p%d, %s(len(%s))", args, goarg, cparam[2], goname)
|
|
} else if (gotype == "uintptr" && ctype ~ /^\*/) {
|
|
args = sprintf("%s(%s)(unsafe.Pointer(%s))", args, ctype, goname)
|
|
} else if (gotype == "unsafe.Pointer" && ctype ~ /^\*/) {
|
|
args = sprintf("%s(%s)(%s)", args, ctype, goname)
|
|
} else {
|
|
args = sprintf("%s%s(%s)", args, ctype, goname)
|
|
}
|
|
|
|
carg++
|
|
}
|
|
|
|
if (cargs[carg] != "") {
|
|
print loc, "too many C parameters" | "cat 1>&2"
|
|
status = 1
|
|
next
|
|
}
|
|
|
|
if (blocking) {
|
|
print "\tEntersyscall()"
|
|
}
|
|
|
|
printf("\t")
|
|
if (gofnresults != "") {
|
|
printf("_r := ")
|
|
}
|
|
printf("c_%s(%s)\n", cfnname, args)
|
|
|
|
seterr = 0
|
|
if (gofnresults != "") {
|
|
fields = split(gofnresults, goresults, ", *")
|
|
if (fields > 2) {
|
|
print loc, "too many Go results" | "cat 1>&2"
|
|
status = 1
|
|
next
|
|
}
|
|
usedr = 0
|
|
for (goresult = 1; goresults[goresult] != ""; goresult++) {
|
|
if (split(goresults[goresult], goparam) != 2) {
|
|
print loc, "bad result:", goresults[goresult] | "cat 1>&2"
|
|
status = 1
|
|
next
|
|
}
|
|
|
|
goname = goparam[1]
|
|
gotype = goparam[2]
|
|
|
|
if (goname == "err") {
|
|
print "\tvar errno Errno"
|
|
print "\tsetErrno := false"
|
|
if (cfnresult ~ /^\*/) {
|
|
print "\tif _r == nil {"
|
|
} else {
|
|
print "\tif _r < 0 {"
|
|
}
|
|
print "\t\terrno = GetErrno()"
|
|
print "\t\tsetErrno = true"
|
|
print "\t}"
|
|
seterr = 1
|
|
} else if (gotype == "uintptr" && cfnresult ~ /^\*/) {
|
|
printf("\t%s = (%s)(unsafe.Pointer(_r))\n", goname, gotype)
|
|
} else {
|
|
if (usedr) {
|
|
print loc, "two parameters but no errno parameter" | "cat 1>&2"
|
|
status = 1
|
|
next
|
|
}
|
|
printf("\t%s = (%s)(_r)\n", goname, gotype)
|
|
usedr = 1
|
|
}
|
|
}
|
|
}
|
|
|
|
if (blocking) {
|
|
print "\tExitsyscall()"
|
|
}
|
|
|
|
if (seterr) {
|
|
print "\tif setErrno {"
|
|
print "\t\terr = errno"
|
|
print "\t}"
|
|
}
|
|
|
|
if (gofnresults != "") {
|
|
print "\treturn"
|
|
}
|
|
|
|
print "}"
|
|
|
|
print ""
|
|
|
|
next
|
|
}
|
|
|
|
{ next }
|
|
|
|
END {
|
|
if (status != 0) {
|
|
print "*** mksyscall.awk failed" | "cat 1>&2"
|
|
exit status
|
|
}
|
|
}
|