unix/mksyscall_aix_ppc64.go - sys - Git at Google

 // Copyright 2019 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.

 // +build ignore

 /*
 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


 This program will generate three files and handle both gc and gccgo implementation:
   - zsyscall_aix_ppc64.go: the common part of each implementation (error handler, pointer creation)
   - zsyscall_aix_ppc64_gc.go: gc part with //go_cgo_import_dynamic and a call to syscall6
   - zsyscall_aix_ppc64_gccgo.go: gccgo part with C function and conversion to C type.

  The generated code looks like this

 zsyscall_aix_ppc64.go
 func asyscall(...) (n int, err error) {
 	 // Pointer Creation
 	 r1, e1 := callasyscall(...)
 	 // Type Conversion
 	 // Error Handler
 	 return
 }

 zsyscall_aix_ppc64_gc.go
 //go:cgo_import_dynamic libc_asyscall asyscall "libc.a/shr_64.o"
 //go:linkname libc_asyscall libc_asyscall
 var asyscall syscallFunc

 func callasyscall(...) (r1 uintptr, e1 Errno) {
 	 r1, _, e1 = syscall6(uintptr(unsafe.Pointer(&libc_asyscall)), "nb_args", ... )
 	 return
 }

 zsyscall_aix_ppc64_ggcgo.go

 // int asyscall(...)

 import "C"

 func callasyscall(...) (r1 uintptr, e1 Errno) {
 	 r1 = uintptr(C.asyscall(...))
 	 e1 = syscall.GetErrno()
 	 return
 }
 */

 package main

 import (
 	"bufio"
 	"flag"
 	"fmt"
 	"io/ioutil"
 	"os"
 	"regexp"
 	"strings"
 )

 var (
 	b32  = flag.Bool("b32", false, "32bit big-endian")
 	l32  = flag.Bool("l32", false, "32bit little-endian")
 	aix  = flag.Bool("aix", false, "aix")
 	tags = flag.String("tags", "", "build tags")
 )

 // cmdLine returns this programs's commandline arguments
 func cmdLine() string {
 	return "go run mksyscall_aix_ppc64.go " + strings.Join(os.Args[1:], " ")
 }

 // buildTags returns build tags
 func buildTags() string {
 	return *tags
 }

 // Param is function parameter
 type Param struct {
 	Name string
 	Type string
 }

 // usage prints the program usage
 func usage() {
 	fmt.Fprintf(os.Stderr, "usage: go run mksyscall_aix_ppc64.go [-b32 | -l32] [-tags x,y] [file ...]\n")
 	os.Exit(1)
 }

 // parseParamList parses parameter list and returns a slice of parameters
 func parseParamList(list string) []string {
 	list = strings.TrimSpace(list)
 	if list == "" {
 		return []string{}
 	}
 	return regexp.MustCompile(`\s*,\s*`).Split(list, -1)
 }

 // parseParam splits a parameter into name and type
 func parseParam(p string) Param {
 	ps := regexp.MustCompile(`^(\S*) (\S*)$`).FindStringSubmatch(p)
 	if ps == nil {
 		fmt.Fprintf(os.Stderr, "malformed parameter: %s\n", p)
 		os.Exit(1)
 	}
 	return Param{ps[1], ps[2]}
 }

 func main() {
 	flag.Usage = usage
 	flag.Parse()
 	if len(flag.Args()) <= 0 {
 		fmt.Fprintf(os.Stderr, "no files to parse provided\n")
 		usage()
 	}

 	endianness := ""
 	if *b32 {
 		endianness = "big-endian"
 	} else if *l32 {
 		endianness = "little-endian"
 	}

 	pack := ""
 	// GCCGO
 	textgccgo := ""
 	cExtern := "/*\n#include <stdint.h>\n"
 	// GC
 	textgc := ""
 	dynimports := ""
 	linknames := ""
 	var vars []string
 	// COMMON
 	textcommon := ""
 	for _, path := range flag.Args() {
 		file, err := os.Open(path)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, err.Error())
 			os.Exit(1)
 		}
 		s := bufio.NewScanner(file)
 		for s.Scan() {
 			t := s.Text()
 			t = strings.TrimSpace(t)
 			t = regexp.MustCompile(`\s+`).ReplaceAllString(t, ` `)
 			if p := regexp.MustCompile(`^package (\S+)$`).FindStringSubmatch(t); p != nil && pack == "" {
 				pack = p[1]
 			}
 			nonblock := regexp.MustCompile(`^\/\/sysnb `).FindStringSubmatch(t)
 			if regexp.MustCompile(`^\/\/sys `).FindStringSubmatch(t) == nil && nonblock == nil {
 				continue
 			}

 			// 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.
 			f := regexp.MustCompile(`^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*(?:(\w*)\.)?(\w*))?$`).FindStringSubmatch(t)
 			if f == nil {
 				fmt.Fprintf(os.Stderr, "%s:%s\nmalformed //sys declaration\n", path, t)
 				os.Exit(1)
 			}
 			funct, inps, outps, modname, sysname := f[2], f[3], f[4], f[5], f[6]

 			// Split argument lists on comma.
 			in := parseParamList(inps)
 			out := parseParamList(outps)

 			inps = strings.Join(in, ", ")
 			outps = strings.Join(out, ", ")

 			if sysname == "" {
 				sysname = funct
 			}

 			onlyCommon := false
 			if funct == "readlen" || funct == "writelen" || funct == "FcntlInt" || funct == "FcntlFlock" {
 				// This function call another syscall which is already implemented.
 				// Therefore, the gc and gccgo part must not be generated.
 				onlyCommon = true
 			}

 			// 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.

 			textcommon += "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n"
 			if !onlyCommon {
 				textgccgo += "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n"
 				textgc += "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n"
 			}

 			// Check if value return, err return available
 			errvar := ""
 			rettype := ""
 			for _, param := range out {
 				p := parseParam(param)
 				if p.Type == "error" {
 					errvar = p.Name
 				} else {
 					rettype = p.Type
 				}
 			}

 			sysname = regexp.MustCompile(`([a-z])([A-Z])`).ReplaceAllString(sysname, `${1}_$2`)
 			sysname = strings.ToLower(sysname) // All libc functions are lowercase.

 			// GCCGO Prototype return type
 			cRettype := ""
 			if rettype == "unsafe.Pointer" {
 				cRettype = "uintptr_t"
 			} else if rettype == "uintptr" {
 				cRettype = "uintptr_t"
 			} else if regexp.MustCompile(`^_`).FindStringSubmatch(rettype) != nil {
 				cRettype = "uintptr_t"
 			} else if rettype == "int" {
 				cRettype = "int"
 			} else if rettype == "int32" {
 				cRettype = "int"
 			} else if rettype == "int64" {
 				cRettype = "long long"
 			} else if rettype == "uint32" {
 				cRettype = "unsigned int"
 			} else if rettype == "uint64" {
 				cRettype = "unsigned long long"
 			} else {
 				cRettype = "int"
 			}
 			if sysname == "exit" {
 				cRettype = "void"
 			}

 			// GCCGO Prototype arguments type
 			var cIn []string
 			for i, param := range in {
 				p := parseParam(param)
 				if regexp.MustCompile(`^\*`).FindStringSubmatch(p.Type) != nil {
 					cIn = append(cIn, "uintptr_t")
 				} else if p.Type == "string" {
 					cIn = append(cIn, "uintptr_t")
 				} else if regexp.MustCompile(`^\[\](.*)`).FindStringSubmatch(p.Type) != nil {
 					cIn = append(cIn, "uintptr_t", "size_t")
 				} else if p.Type == "unsafe.Pointer" {
 					cIn = append(cIn, "uintptr_t")
 				} else if p.Type == "uintptr" {
 					cIn = append(cIn, "uintptr_t")
 				} else if regexp.MustCompile(`^_`).FindStringSubmatch(p.Type) != nil {
 					cIn = append(cIn, "uintptr_t")
 				} else if p.Type == "int" {
 					if (i == 0 || i == 2) && funct == "fcntl" {
 						// These fcntl arguments needs to be uintptr to be able to call FcntlInt and FcntlFlock
 						cIn = append(cIn, "uintptr_t")
 					} else {
 						cIn = append(cIn, "int")
 					}

 				} else if p.Type == "int32" {
 					cIn = append(cIn, "int")
 				} else if p.Type == "int64" {
 					cIn = append(cIn, "long long")
 				} else if p.Type == "uint32" {
 					cIn = append(cIn, "unsigned int")
 				} else if p.Type == "uint64" {
 					cIn = append(cIn, "unsigned long long")
 				} else {
 					cIn = append(cIn, "int")
 				}
 			}

 			if !onlyCommon {
 				// GCCGO Prototype Generation
 				// Imports of system calls from libc
 				if sysname == "select" {
 					// select is a keyword of Go. Its name is
 					// changed to c_select.
 					cExtern += "#define c_select select\n"
 				}
 				cExtern += fmt.Sprintf("%s %s", cRettype, sysname)
 				cIn := strings.Join(cIn, ", ")
 				cExtern += fmt.Sprintf("(%s);\n", cIn)
 			}
 			// GC Library name
 			if modname == "" {
 				modname = "libc.a/shr_64.o"
 			} else {
 				fmt.Fprintf(os.Stderr, "%s: only syscall using libc are available\n", funct)
 				os.Exit(1)
 			}
 			sysvarname := fmt.Sprintf("libc_%s", sysname)

 			if !onlyCommon {
 				// GC Runtime import of function to allow cross-platform builds.
 				dynimports += fmt.Sprintf("//go:cgo_import_dynamic %s %s \"%s\"\n", sysvarname, sysname, modname)
 				// GC Link symbol to proc address variable.
 				linknames += fmt.Sprintf("//go:linkname %s %s\n", sysvarname, sysvarname)
 				// GC Library proc address variable.
 				vars = append(vars, sysvarname)
 			}

 			strconvfunc := "BytePtrFromString"
 			strconvtype := "*byte"

 			// Go function header.
 			if outps != "" {
 				outps = fmt.Sprintf(" (%s)", outps)
 			}
 			if textcommon != "" {
 				textcommon += "\n"
 			}

 			textcommon += fmt.Sprintf("func %s(%s)%s {\n", funct, strings.Join(in, ", "), outps)

 			// Prepare arguments tocall.
 			var argscommon []string // Arguments in the common part
 			var argscall []string   // Arguments for call prototype
 			var argsgc []string     // Arguments for gc call (with syscall6)
 			var argsgccgo []string  // Arguments for gccgo call (with C.name_of_syscall)
 			n := 0
 			argN := 0
 			for _, param := range in {
 				p := parseParam(param)
 				if regexp.MustCompile(`^\*`).FindStringSubmatch(p.Type) != nil {
 					argscommon = append(argscommon, fmt.Sprintf("uintptr(unsafe.Pointer(%s))", p.Name))
 					argscall = append(argscall, fmt.Sprintf("%s uintptr", p.Name))
 					argsgc = append(argsgc, p.Name)
 					argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(%s)", p.Name))
 				} else if p.Type == "string" && errvar != "" {
 					textcommon += fmt.Sprintf("\tvar _p%d %s\n", n, strconvtype)
 					textcommon += fmt.Sprintf("\t_p%d, %s = %s(%s)\n", n, errvar, strconvfunc, p.Name)
 					textcommon += fmt.Sprintf("\tif %s != nil {\n\t\treturn\n\t}\n", errvar)

 					argscommon = append(argscommon, fmt.Sprintf("uintptr(unsafe.Pointer(_p%d))", n))
 					argscall = append(argscall, fmt.Sprintf("_p%d uintptr ", n))
 					argsgc = append(argsgc, fmt.Sprintf("_p%d", n))
 					argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(_p%d)", n))
 					n++
 				} else if p.Type == "string" {
 					fmt.Fprintf(os.Stderr, path+":"+funct+" uses string arguments, but has no error return\n")
 					textcommon += fmt.Sprintf("\tvar _p%d %s\n", n, strconvtype)
 					textcommon += fmt.Sprintf("\t_p%d, %s = %s(%s)\n", n, errvar, strconvfunc, p.Name)
 					textcommon += fmt.Sprintf("\tif %s != nil {\n\t\treturn\n\t}\n", errvar)

 					argscommon = append(argscommon, fmt.Sprintf("uintptr(unsafe.Pointer(_p%d))", n))
 					argscall = append(argscall, fmt.Sprintf("_p%d uintptr", n))
 					argsgc = append(argsgc, fmt.Sprintf("_p%d", n))
 					argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(_p%d)", n))
 					n++
 				} else if m := regexp.MustCompile(`^\[\](.*)`).FindStringSubmatch(p.Type); m != nil {
 					// Convert slice into pointer, length.
 					// Have to be careful not to take address of &a[0] if len == 0:
 					// pass nil in that case.
 					textcommon += fmt.Sprintf("\tvar _p%d *%s\n", n, m[1])
 					textcommon += fmt.Sprintf("\tif len(%s) > 0 {\n\t\t_p%d = &%s[0]\n\t}\n", p.Name, n, p.Name)
 					argscommon = append(argscommon, fmt.Sprintf("uintptr(unsafe.Pointer(_p%d))", n), fmt.Sprintf("len(%s)", p.Name))
 					argscall = append(argscall, fmt.Sprintf("_p%d uintptr", n), fmt.Sprintf("_lenp%d int", n))
 					argsgc = append(argsgc, fmt.Sprintf("_p%d", n), fmt.Sprintf("uintptr(_lenp%d)", n))
 					argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(_p%d)", n), fmt.Sprintf("C.size_t(_lenp%d)", n))
 					n++
 				} else if p.Type == "int64" && endianness != "" {
 					fmt.Fprintf(os.Stderr, path+":"+funct+" uses int64 with 32 bits mode. Case not yet implemented\n")
 				} else if p.Type == "bool" {
 					fmt.Fprintf(os.Stderr, path+":"+funct+" uses bool. Case not yet implemented\n")
 				} else if regexp.MustCompile(`^_`).FindStringSubmatch(p.Type) != nil || p.Type == "unsafe.Pointer" {
 					argscommon = append(argscommon, fmt.Sprintf("uintptr(%s)", p.Name))
 					argscall = append(argscall, fmt.Sprintf("%s uintptr", p.Name))
 					argsgc = append(argsgc, p.Name)
 					argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(%s)", p.Name))
 				} else if p.Type == "int" {
 					if (argN == 0 || argN == 2) && ((funct == "fcntl") || (funct == "FcntlInt") || (funct == "FcntlFlock")) {
 						// These fcntl arguments need to be uintptr to be able to call FcntlInt and FcntlFlock
 						argscommon = append(argscommon, fmt.Sprintf("uintptr(%s)", p.Name))
 						argscall = append(argscall, fmt.Sprintf("%s uintptr", p.Name))
 						argsgc = append(argsgc, p.Name)
 						argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(%s)", p.Name))

 					} else {
 						argscommon = append(argscommon, p.Name)
 						argscall = append(argscall, fmt.Sprintf("%s int", p.Name))
 						argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
 						argsgccgo = append(argsgccgo, fmt.Sprintf("C.int(%s)", p.Name))
 					}
 				} else if p.Type == "int32" {
 					argscommon = append(argscommon, p.Name)
 					argscall = append(argscall, fmt.Sprintf("%s int32", p.Name))
 					argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
 					argsgccgo = append(argsgccgo, fmt.Sprintf("C.int(%s)", p.Name))
 				} else if p.Type == "int64" {
 					argscommon = append(argscommon, p.Name)
 					argscall = append(argscall, fmt.Sprintf("%s int64", p.Name))
 					argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
 					argsgccgo = append(argsgccgo, fmt.Sprintf("C.longlong(%s)", p.Name))
 				} else if p.Type == "uint32" {
 					argscommon = append(argscommon, p.Name)
 					argscall = append(argscall, fmt.Sprintf("%s uint32", p.Name))
 					argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
 					argsgccgo = append(argsgccgo, fmt.Sprintf("C.uint(%s)", p.Name))
 				} else if p.Type == "uint64" {
 					argscommon = append(argscommon, p.Name)
 					argscall = append(argscall, fmt.Sprintf("%s uint64", p.Name))
 					argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
 					argsgccgo = append(argsgccgo, fmt.Sprintf("C.ulonglong(%s)", p.Name))
 				} else if p.Type == "uintptr" {
 					argscommon = append(argscommon, p.Name)
 					argscall = append(argscall, fmt.Sprintf("%s uintptr", p.Name))
 					argsgc = append(argsgc, p.Name)
 					argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(%s)", p.Name))
 				} else {
 					argscommon = append(argscommon, fmt.Sprintf("int(%s)", p.Name))
 					argscall = append(argscall, fmt.Sprintf("%s int", p.Name))
 					argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
 					argsgccgo = append(argsgccgo, fmt.Sprintf("C.int(%s)", p.Name))
 				}
 				argN++
 			}
 			nargs := len(argsgc)

 			// COMMON function generation
 			argscommonlist := strings.Join(argscommon, ", ")
 			callcommon := fmt.Sprintf("call%s(%s)", sysname, argscommonlist)
 			ret := []string{"_", "_"}
 			body := ""
 			doErrno := false
 			for i := 0; i < len(out); i++ {
 				p := parseParam(out[i])
 				reg := ""
 				if p.Name == "err" {
 					reg = "e1"
 					ret[1] = reg
 					doErrno = true
 				} else {
 					reg = "r0"
 					ret[0] = reg
 				}
 				if p.Type == "bool" {
 					reg = fmt.Sprintf("%s != 0", reg)
 				}
 				if reg != "e1" {
 					body += fmt.Sprintf("\t%s = %s(%s)\n", p.Name, p.Type, reg)
 				}
 			}
 			if ret[0] == "_" && ret[1] == "_" {
 				textcommon += fmt.Sprintf("\t%s\n", callcommon)
 			} else {
 				textcommon += fmt.Sprintf("\t%s, %s := %s\n", ret[0], ret[1], callcommon)
 			}
 			textcommon += body

 			if doErrno {
 				textcommon += "\tif e1 != 0 {\n"
 				textcommon += "\t\terr = errnoErr(e1)\n"
 				textcommon += "\t}\n"
 			}
 			textcommon += "\treturn\n"
 			textcommon += "}\n"

 			if onlyCommon {
 				continue
 			}

 			// CALL Prototype
 			callProto := fmt.Sprintf("func call%s(%s) (r1 uintptr, e1 Errno) {\n", sysname, strings.Join(argscall, ", "))

 			// GC function generation
 			asm := "syscall6"
 			if nonblock != nil {
 				asm = "rawSyscall6"
 			}

 			if len(argsgc) <= 6 {
 				for len(argsgc) < 6 {
 					argsgc = append(argsgc, "0")
 				}
 			} else {
 				fmt.Fprintf(os.Stderr, "%s: too many arguments to system call", funct)
 				os.Exit(1)
 			}
 			argsgclist := strings.Join(argsgc, ", ")
 			callgc := fmt.Sprintf("%s(uintptr(unsafe.Pointer(&%s)), %d, %s)", asm, sysvarname, nargs, argsgclist)

 			textgc += callProto
 			textgc += fmt.Sprintf("\tr1, _, e1 = %s\n", callgc)
 			textgc += "\treturn\n}\n"

 			// GCCGO function generation
 			argsgccgolist := strings.Join(argsgccgo, ", ")
 			var callgccgo string
 			if sysname == "select" {
 				// select is a keyword of Go. Its name is
 				// changed to c_select.
 				callgccgo = fmt.Sprintf("C.c_%s(%s)", sysname, argsgccgolist)
 			} else {
 				callgccgo = fmt.Sprintf("C.%s(%s)", sysname, argsgccgolist)
 			}
 			textgccgo += callProto
 			textgccgo += fmt.Sprintf("\tr1 = uintptr(%s)\n", callgccgo)
 			textgccgo += "\te1 = syscall.GetErrno()\n"
 			textgccgo += "\treturn\n}\n"
 		}
 		if err := s.Err(); err != nil {
 			fmt.Fprintf(os.Stderr, err.Error())
 			os.Exit(1)
 		}
 		file.Close()
 	}
 	imp := ""
 	if pack != "unix" {
 		imp = "import \"golang.org/x/sys/unix\"\n"

 	}

 	// Print zsyscall_aix_ppc64.go
 	err := ioutil.WriteFile("zsyscall_aix_ppc64.go",
 		[]byte(fmt.Sprintf(srcTemplate1, cmdLine(), buildTags(), pack, imp, textcommon)),
 		0644)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, err.Error())
 		os.Exit(1)
 	}

 	// Print zsyscall_aix_ppc64_gc.go
 	vardecls := "\t" + strings.Join(vars, ",\n\t")
 	vardecls += " syscallFunc"
 	err = ioutil.WriteFile("zsyscall_aix_ppc64_gc.go",
 		[]byte(fmt.Sprintf(srcTemplate2, cmdLine(), buildTags(), pack, imp, dynimports, linknames, vardecls, textgc)),
 		0644)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, err.Error())
 		os.Exit(1)
 	}

 	// Print zsyscall_aix_ppc64_gccgo.go
 	err = ioutil.WriteFile("zsyscall_aix_ppc64_gccgo.go",
 		[]byte(fmt.Sprintf(srcTemplate3, cmdLine(), buildTags(), pack, cExtern, imp, textgccgo)),
 		0644)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, err.Error())
 		os.Exit(1)
 	}
 }

 const srcTemplate1 = `// %s
 // Code generated by the command above; see README.md. DO NOT EDIT.

 // +build %s

 package %s

 import (
 	"unsafe"
 )


 %s

 %s
 `
 const srcTemplate2 = `// %s
 // Code generated by the command above; see README.md. DO NOT EDIT.

 // +build %s
 // +build !gccgo

 package %s

 import (
 	"unsafe"
 )
 %s
 %s
 %s
 type syscallFunc uintptr

 var (
 %s
 )

 // 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)

 %s
 `
 const srcTemplate3 = `// %s
 // Code generated by the command above; see README.md. DO NOT EDIT.

 // +build %s
 // +build gccgo

 package %s

 %s
 */
 import "C"
 import (
 	"syscall"
 )


 %s

 %s
 `
	// Copyright 2019 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.

	// +build ignore

	/*
	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


	This program will generate three files and handle both gc and gccgo implementation:
	- zsyscall_aix_ppc64.go: the common part of each implementation (error handler, pointer creation)
	- zsyscall_aix_ppc64_gc.go: gc part with //go_cgo_import_dynamic and a call to syscall6
	- zsyscall_aix_ppc64_gccgo.go: gccgo part with C function and conversion to C type.

	The generated code looks like this

	zsyscall_aix_ppc64.go
	func asyscall(...) (n int, err error) {
	// Pointer Creation
	r1, e1 := callasyscall(...)
	// Type Conversion
	// Error Handler
	return
	}

	zsyscall_aix_ppc64_gc.go
	//go:cgo_import_dynamic libc_asyscall asyscall "libc.a/shr_64.o"
	//go:linkname libc_asyscall libc_asyscall
	var asyscall syscallFunc

	func callasyscall(...) (r1 uintptr, e1 Errno) {
	r1, _, e1 = syscall6(uintptr(unsafe.Pointer(&libc_asyscall)), "nb_args", ... )
	return
	}

	zsyscall_aix_ppc64_ggcgo.go

	// int asyscall(...)

	import "C"

	func callasyscall(...) (r1 uintptr, e1 Errno) {
	r1 = uintptr(C.asyscall(...))
	e1 = syscall.GetErrno()
	return
	}
	*/

	package main

	import (
	"bufio"
	"flag"
	"fmt"
	"io/ioutil"
	"os"
	"regexp"
	"strings"
	)

	var (
	b32 = flag.Bool("b32", false, "32bit big-endian")
	l32 = flag.Bool("l32", false, "32bit little-endian")
	aix = flag.Bool("aix", false, "aix")
	tags = flag.String("tags", "", "build tags")
	)

	// cmdLine returns this programs's commandline arguments
	func cmdLine() string {
	return "go run mksyscall_aix_ppc64.go " + strings.Join(os.Args[1:], " ")
	}

	// buildTags returns build tags
	func buildTags() string {
	return *tags
	}

	// Param is function parameter
	type Param struct {
	Name string
	Type string
	}

	// usage prints the program usage
	func usage() {
	fmt.Fprintf(os.Stderr, "usage: go run mksyscall_aix_ppc64.go [-b32 \| -l32] [-tags x,y] [file ...]\n")
	os.Exit(1)
	}

	// parseParamList parses parameter list and returns a slice of parameters
	func parseParamList(list string) []string {
	list = strings.TrimSpace(list)
	if list == "" {
	return []string{}
	}
	return regexp.MustCompile(`\s,\s`).Split(list, -1)
	}

	// parseParam splits a parameter into name and type
	func parseParam(p string) Param {
	ps := regexp.MustCompile(`^(\S) (\S)$`).FindStringSubmatch(p)
	if ps == nil {
	fmt.Fprintf(os.Stderr, "malformed parameter: %s\n", p)
	os.Exit(1)
	}
	return Param{ps[1], ps[2]}
	}

	func main() {
	flag.Usage = usage
	flag.Parse()
	if len(flag.Args()) <= 0 {
	fmt.Fprintf(os.Stderr, "no files to parse provided\n")
	usage()
	}

	endianness := ""
	if *b32 {
	endianness = "big-endian"
	} else if *l32 {
	endianness = "little-endian"
	}

	pack := ""
	// GCCGO
	textgccgo := ""
	cExtern := "/*\n#include <stdint.h>\n"
	// GC
	textgc := ""
	dynimports := ""
	linknames := ""
	var vars []string
	// COMMON
	textcommon := ""
	for _, path := range flag.Args() {
	file, err := os.Open(path)
	if err != nil {
	fmt.Fprintf(os.Stderr, err.Error())
	os.Exit(1)
	}
	s := bufio.NewScanner(file)
	for s.Scan() {
	t := s.Text()
	t = strings.TrimSpace(t)
	t = regexp.MustCompile(`\s+`).ReplaceAllString(t, ` `)
	if p := regexp.MustCompile(`^package (\S+)$`).FindStringSubmatch(t); p != nil && pack == "" {
	pack = p[1]
	}
	nonblock := regexp.MustCompile(`^\/\/sysnb `).FindStringSubmatch(t)
	if regexp.MustCompile(`^\/\/sys `).FindStringSubmatch(t) == nil && nonblock == nil {
	continue
	}

	// 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.
	f := regexp.MustCompile(`^\/\/sys(nb)? (\w+)\(([^()])\)\s(?:\(([^()]+)\))?\s(?:=\s(?:(\w)\.)?(\w))?$`).FindStringSubmatch(t)
	if f == nil {
	fmt.Fprintf(os.Stderr, "%s:%s\nmalformed //sys declaration\n", path, t)
	os.Exit(1)
	}
	funct, inps, outps, modname, sysname := f[2], f[3], f[4], f[5], f[6]

	// Split argument lists on comma.
	in := parseParamList(inps)
	out := parseParamList(outps)

	inps = strings.Join(in, ", ")
	outps = strings.Join(out, ", ")

	if sysname == "" {
	sysname = funct
	}

	onlyCommon := false
	if funct == "readlen" \|\| funct == "writelen" \|\| funct == "FcntlInt" \|\| funct == "FcntlFlock" {
	// This function call another syscall which is already implemented.
	// Therefore, the gc and gccgo part must not be generated.
	onlyCommon = true
	}

	// 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.

	textcommon += "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n"
	if !onlyCommon {
	textgccgo += "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n"
	textgc += "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n"
	}

	// Check if value return, err return available
	errvar := ""
	rettype := ""
	for _, param := range out {
	p := parseParam(param)
	if p.Type == "error" {
	errvar = p.Name
	} else {
	rettype = p.Type
	}
	}

	sysname = regexp.MustCompile(`([a-z])([A-Z])`).ReplaceAllString(sysname, `${1}_$2`)
	sysname = strings.ToLower(sysname) // All libc functions are lowercase.

	// GCCGO Prototype return type
	cRettype := ""
	if rettype == "unsafe.Pointer" {
	cRettype = "uintptr_t"
	} else if rettype == "uintptr" {
	cRettype = "uintptr_t"
	} else if regexp.MustCompile(`^_`).FindStringSubmatch(rettype) != nil {
	cRettype = "uintptr_t"
	} else if rettype == "int" {
	cRettype = "int"
	} else if rettype == "int32" {
	cRettype = "int"
	} else if rettype == "int64" {
	cRettype = "long long"
	} else if rettype == "uint32" {
	cRettype = "unsigned int"
	} else if rettype == "uint64" {
	cRettype = "unsigned long long"
	} else {
	cRettype = "int"
	}
	if sysname == "exit" {
	cRettype = "void"
	}

	// GCCGO Prototype arguments type
	var cIn []string
	for i, param := range in {
	p := parseParam(param)
	if regexp.MustCompile(`^\*`).FindStringSubmatch(p.Type) != nil {
	cIn = append(cIn, "uintptr_t")
	} else if p.Type == "string" {
	cIn = append(cIn, "uintptr_t")
	} else if regexp.MustCompile(`^\[\](.*)`).FindStringSubmatch(p.Type) != nil {
	cIn = append(cIn, "uintptr_t", "size_t")
	} else if p.Type == "unsafe.Pointer" {
	cIn = append(cIn, "uintptr_t")
	} else if p.Type == "uintptr" {
	cIn = append(cIn, "uintptr_t")
	} else if regexp.MustCompile(`^_`).FindStringSubmatch(p.Type) != nil {
	cIn = append(cIn, "uintptr_t")
	} else if p.Type == "int" {
	if (i == 0 \|\| i == 2) && funct == "fcntl" {
	// These fcntl arguments needs to be uintptr to be able to call FcntlInt and FcntlFlock
	cIn = append(cIn, "uintptr_t")
	} else {
	cIn = append(cIn, "int")
	}

	} else if p.Type == "int32" {
	cIn = append(cIn, "int")
	} else if p.Type == "int64" {
	cIn = append(cIn, "long long")
	} else if p.Type == "uint32" {
	cIn = append(cIn, "unsigned int")
	} else if p.Type == "uint64" {
	cIn = append(cIn, "unsigned long long")
	} else {
	cIn = append(cIn, "int")
	}
	}

	if !onlyCommon {
	// GCCGO Prototype Generation
	// Imports of system calls from libc
	if sysname == "select" {
	// select is a keyword of Go. Its name is
	// changed to c_select.
	cExtern += "#define c_select select\n"
	}
	cExtern += fmt.Sprintf("%s %s", cRettype, sysname)
	cIn := strings.Join(cIn, ", ")
	cExtern += fmt.Sprintf("(%s);\n", cIn)
	}
	// GC Library name
	if modname == "" {
	modname = "libc.a/shr_64.o"
	} else {
	fmt.Fprintf(os.Stderr, "%s: only syscall using libc are available\n", funct)
	os.Exit(1)
	}
	sysvarname := fmt.Sprintf("libc_%s", sysname)

	if !onlyCommon {
	// GC Runtime import of function to allow cross-platform builds.
	dynimports += fmt.Sprintf("//go:cgo_import_dynamic %s %s \"%s\"\n", sysvarname, sysname, modname)
	// GC Link symbol to proc address variable.
	linknames += fmt.Sprintf("//go:linkname %s %s\n", sysvarname, sysvarname)
	// GC Library proc address variable.
	vars = append(vars, sysvarname)
	}

	strconvfunc := "BytePtrFromString"
	strconvtype := "*byte"

	// Go function header.
	if outps != "" {
	outps = fmt.Sprintf(" (%s)", outps)
	}
	if textcommon != "" {
	textcommon += "\n"
	}

	textcommon += fmt.Sprintf("func %s(%s)%s {\n", funct, strings.Join(in, ", "), outps)

	// Prepare arguments tocall.
	var argscommon []string // Arguments in the common part
	var argscall []string // Arguments for call prototype
	var argsgc []string // Arguments for gc call (with syscall6)
	var argsgccgo []string // Arguments for gccgo call (with C.name_of_syscall)
	n := 0
	argN := 0
	for _, param := range in {
	p := parseParam(param)
	if regexp.MustCompile(`^\*`).FindStringSubmatch(p.Type) != nil {
	argscommon = append(argscommon, fmt.Sprintf("uintptr(unsafe.Pointer(%s))", p.Name))
	argscall = append(argscall, fmt.Sprintf("%s uintptr", p.Name))
	argsgc = append(argsgc, p.Name)
	argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(%s)", p.Name))
	} else if p.Type == "string" && errvar != "" {
	textcommon += fmt.Sprintf("\tvar _p%d %s\n", n, strconvtype)
	textcommon += fmt.Sprintf("\t_p%d, %s = %s(%s)\n", n, errvar, strconvfunc, p.Name)
	textcommon += fmt.Sprintf("\tif %s != nil {\n\t\treturn\n\t}\n", errvar)

	argscommon = append(argscommon, fmt.Sprintf("uintptr(unsafe.Pointer(_p%d))", n))
	argscall = append(argscall, fmt.Sprintf("_p%d uintptr ", n))
	argsgc = append(argsgc, fmt.Sprintf("_p%d", n))
	argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(_p%d)", n))
	n++
	} else if p.Type == "string" {
	fmt.Fprintf(os.Stderr, path+":"+funct+" uses string arguments, but has no error return\n")
	textcommon += fmt.Sprintf("\tvar _p%d %s\n", n, strconvtype)
	textcommon += fmt.Sprintf("\t_p%d, %s = %s(%s)\n", n, errvar, strconvfunc, p.Name)
	textcommon += fmt.Sprintf("\tif %s != nil {\n\t\treturn\n\t}\n", errvar)

	argscommon = append(argscommon, fmt.Sprintf("uintptr(unsafe.Pointer(_p%d))", n))
	argscall = append(argscall, fmt.Sprintf("_p%d uintptr", n))
	argsgc = append(argsgc, fmt.Sprintf("_p%d", n))
	argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(_p%d)", n))
	n++
	} else if m := regexp.MustCompile(`^\[\](.*)`).FindStringSubmatch(p.Type); m != nil {
	// Convert slice into pointer, length.
	// Have to be careful not to take address of &a[0] if len == 0:
	// pass nil in that case.
	textcommon += fmt.Sprintf("\tvar _p%d *%s\n", n, m[1])
	textcommon += fmt.Sprintf("\tif len(%s) > 0 {\n\t\t_p%d = &%s[0]\n\t}\n", p.Name, n, p.Name)
	argscommon = append(argscommon, fmt.Sprintf("uintptr(unsafe.Pointer(_p%d))", n), fmt.Sprintf("len(%s)", p.Name))
	argscall = append(argscall, fmt.Sprintf("_p%d uintptr", n), fmt.Sprintf("_lenp%d int", n))
	argsgc = append(argsgc, fmt.Sprintf("_p%d", n), fmt.Sprintf("uintptr(_lenp%d)", n))
	argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(_p%d)", n), fmt.Sprintf("C.size_t(_lenp%d)", n))
	n++
	} else if p.Type == "int64" && endianness != "" {
	fmt.Fprintf(os.Stderr, path+":"+funct+" uses int64 with 32 bits mode. Case not yet implemented\n")
	} else if p.Type == "bool" {
	fmt.Fprintf(os.Stderr, path+":"+funct+" uses bool. Case not yet implemented\n")
	} else if regexp.MustCompile(`^_`).FindStringSubmatch(p.Type) != nil \|\| p.Type == "unsafe.Pointer" {
	argscommon = append(argscommon, fmt.Sprintf("uintptr(%s)", p.Name))
	argscall = append(argscall, fmt.Sprintf("%s uintptr", p.Name))
	argsgc = append(argsgc, p.Name)
	argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(%s)", p.Name))
	} else if p.Type == "int" {
	if (argN == 0 \|\| argN == 2) && ((funct == "fcntl") \|\| (funct == "FcntlInt") \|\| (funct == "FcntlFlock")) {
	// These fcntl arguments need to be uintptr to be able to call FcntlInt and FcntlFlock
	argscommon = append(argscommon, fmt.Sprintf("uintptr(%s)", p.Name))
	argscall = append(argscall, fmt.Sprintf("%s uintptr", p.Name))
	argsgc = append(argsgc, p.Name)
	argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(%s)", p.Name))

	} else {
	argscommon = append(argscommon, p.Name)
	argscall = append(argscall, fmt.Sprintf("%s int", p.Name))
	argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
	argsgccgo = append(argsgccgo, fmt.Sprintf("C.int(%s)", p.Name))
	}
	} else if p.Type == "int32" {
	argscommon = append(argscommon, p.Name)
	argscall = append(argscall, fmt.Sprintf("%s int32", p.Name))
	argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
	argsgccgo = append(argsgccgo, fmt.Sprintf("C.int(%s)", p.Name))
	} else if p.Type == "int64" {
	argscommon = append(argscommon, p.Name)
	argscall = append(argscall, fmt.Sprintf("%s int64", p.Name))
	argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
	argsgccgo = append(argsgccgo, fmt.Sprintf("C.longlong(%s)", p.Name))
	} else if p.Type == "uint32" {
	argscommon = append(argscommon, p.Name)
	argscall = append(argscall, fmt.Sprintf("%s uint32", p.Name))
	argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
	argsgccgo = append(argsgccgo, fmt.Sprintf("C.uint(%s)", p.Name))
	} else if p.Type == "uint64" {
	argscommon = append(argscommon, p.Name)
	argscall = append(argscall, fmt.Sprintf("%s uint64", p.Name))
	argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
	argsgccgo = append(argsgccgo, fmt.Sprintf("C.ulonglong(%s)", p.Name))
	} else if p.Type == "uintptr" {
	argscommon = append(argscommon, p.Name)
	argscall = append(argscall, fmt.Sprintf("%s uintptr", p.Name))
	argsgc = append(argsgc, p.Name)
	argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(%s)", p.Name))
	} else {
	argscommon = append(argscommon, fmt.Sprintf("int(%s)", p.Name))
	argscall = append(argscall, fmt.Sprintf("%s int", p.Name))
	argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
	argsgccgo = append(argsgccgo, fmt.Sprintf("C.int(%s)", p.Name))
	}
	argN++
	}
	nargs := len(argsgc)

	// COMMON function generation
	argscommonlist := strings.Join(argscommon, ", ")
	callcommon := fmt.Sprintf("call%s(%s)", sysname, argscommonlist)
	ret := []string{"_", "_"}
	body := ""
	doErrno := false
	for i := 0; i < len(out); i++ {
	p := parseParam(out[i])
	reg := ""
	if p.Name == "err" {
	reg = "e1"
	ret[1] = reg
	doErrno = true
	} else {
	reg = "r0"
	ret[0] = reg
	}
	if p.Type == "bool" {
	reg = fmt.Sprintf("%s != 0", reg)
	}
	if reg != "e1" {
	body += fmt.Sprintf("\t%s = %s(%s)\n", p.Name, p.Type, reg)
	}
	}
	if ret[0] == "_" && ret[1] == "_" {
	textcommon += fmt.Sprintf("\t%s\n", callcommon)
	} else {
	textcommon += fmt.Sprintf("\t%s, %s := %s\n", ret[0], ret[1], callcommon)
	}
	textcommon += body

	if doErrno {
	textcommon += "\tif e1 != 0 {\n"
	textcommon += "\t\terr = errnoErr(e1)\n"
	textcommon += "\t}\n"
	}
	textcommon += "\treturn\n"
	textcommon += "}\n"

	if onlyCommon {
	continue
	}

	// CALL Prototype
	callProto := fmt.Sprintf("func call%s(%s) (r1 uintptr, e1 Errno) {\n", sysname, strings.Join(argscall, ", "))

	// GC function generation
	asm := "syscall6"
	if nonblock != nil {
	asm = "rawSyscall6"
	}

	if len(argsgc) <= 6 {
	for len(argsgc) < 6 {
	argsgc = append(argsgc, "0")
	}
	} else {
	fmt.Fprintf(os.Stderr, "%s: too many arguments to system call", funct)
	os.Exit(1)
	}
	argsgclist := strings.Join(argsgc, ", ")
	callgc := fmt.Sprintf("%s(uintptr(unsafe.Pointer(&%s)), %d, %s)", asm, sysvarname, nargs, argsgclist)

	textgc += callProto
	textgc += fmt.Sprintf("\tr1, _, e1 = %s\n", callgc)
	textgc += "\treturn\n}\n"

	// GCCGO function generation
	argsgccgolist := strings.Join(argsgccgo, ", ")
	var callgccgo string
	if sysname == "select" {
	// select is a keyword of Go. Its name is
	// changed to c_select.
	callgccgo = fmt.Sprintf("C.c_%s(%s)", sysname, argsgccgolist)
	} else {
	callgccgo = fmt.Sprintf("C.%s(%s)", sysname, argsgccgolist)
	}
	textgccgo += callProto
	textgccgo += fmt.Sprintf("\tr1 = uintptr(%s)\n", callgccgo)
	textgccgo += "\te1 = syscall.GetErrno()\n"
	textgccgo += "\treturn\n}\n"
	}
	if err := s.Err(); err != nil {
	fmt.Fprintf(os.Stderr, err.Error())
	os.Exit(1)
	}
	file.Close()
	}
	imp := ""
	if pack != "unix" {
	imp = "import \"golang.org/x/sys/unix\"\n"

	}

	// Print zsyscall_aix_ppc64.go
	err := ioutil.WriteFile("zsyscall_aix_ppc64.go",
	[]byte(fmt.Sprintf(srcTemplate1, cmdLine(), buildTags(), pack, imp, textcommon)),
	0644)
	if err != nil {
	fmt.Fprintf(os.Stderr, err.Error())
	os.Exit(1)
	}

	// Print zsyscall_aix_ppc64_gc.go
	vardecls := "\t" + strings.Join(vars, ",\n\t")
	vardecls += " syscallFunc"
	err = ioutil.WriteFile("zsyscall_aix_ppc64_gc.go",
	[]byte(fmt.Sprintf(srcTemplate2, cmdLine(), buildTags(), pack, imp, dynimports, linknames, vardecls, textgc)),
	0644)
	if err != nil {
	fmt.Fprintf(os.Stderr, err.Error())
	os.Exit(1)
	}

	// Print zsyscall_aix_ppc64_gccgo.go
	err = ioutil.WriteFile("zsyscall_aix_ppc64_gccgo.go",
	[]byte(fmt.Sprintf(srcTemplate3, cmdLine(), buildTags(), pack, cExtern, imp, textgccgo)),
	0644)
	if err != nil {
	fmt.Fprintf(os.Stderr, err.Error())
	os.Exit(1)
	}
	}

	const srcTemplate1 = `// %s
	// Code generated by the command above; see README.md. DO NOT EDIT.

	// +build %s

	package %s

	import (
	"unsafe"
	)


	%s

	%s
	`
	const srcTemplate2 = `// %s
	// Code generated by the command above; see README.md. DO NOT EDIT.

	// +build %s
	// +build !gccgo

	package %s

	import (
	"unsafe"
	)
	%s
	%s
	%s
	type syscallFunc uintptr

	var (
	%s
	)

	// 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)

	%s
	`
	const srcTemplate3 = `// %s
	// Code generated by the command above; see README.md. DO NOT EDIT.

	// +build %s
	// +build gccgo

	package %s

	%s
	*/
	import "C"
	import (
	"syscall"
	)


	%s

	%s
	`