// Copyright 2017 syzkaller project authors. All rights reserved.
|
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
|
|
package compiler
|
|
import (
|
"fmt"
|
"strconv"
|
|
"github.com/google/syzkaller/pkg/ast"
|
"github.com/google/syzkaller/prog"
|
)
|
|
// typeDesc is arg/field type descriptor.
|
type typeDesc struct {
|
Names []string
|
CanBeTypedef bool // can be type alias target?
|
CantBeOpt bool // can't be marked as opt?
|
NeedBase bool // needs base type when used as field?
|
AllowColon bool // allow colon (int8:2) on fields?
|
ResourceBase bool // can be resource base type?
|
OptArgs int // number of optional arguments in Args array
|
Args []namedArg // type arguments
|
// CanBeArgRet returns if this type can be syscall argument/return (false if nil).
|
CanBeArgRet func(comp *compiler, t *ast.Type) (bool, bool)
|
// Check does custom verification of the type (optional, consts are not patched yet).
|
Check func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon)
|
// CheckConsts does custom verification of the type (optional, consts are patched).
|
CheckConsts func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon)
|
// Varlen returns if the type is variable-length (false if not set).
|
Varlen func(comp *compiler, t *ast.Type, args []*ast.Type) bool
|
// ZeroSize returns if the type has static 0 size (false if not set).
|
ZeroSize func(comp *compiler, t *ast.Type, args []*ast.Type) bool
|
// Gen generates corresponding prog.Type.
|
Gen func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type
|
}
|
|
// typeArg describes a type argument.
|
type typeArg struct {
|
Names []string
|
Kind int // int/ident/string
|
MaxArgs int // maxiumum number of subargs
|
AllowColon bool // allow colon (2:3)?
|
// Check does custom verification of the arg (optional).
|
Check func(comp *compiler, t *ast.Type)
|
CheckConsts func(comp *compiler, t *ast.Type)
|
}
|
|
type namedArg struct {
|
Name string
|
Type *typeArg
|
IsArg bool // does not need base type
|
}
|
|
const (
|
kindAny = iota
|
kindInt
|
kindIdent
|
kindString
|
)
|
|
func canBeArg(comp *compiler, t *ast.Type) (bool, bool) { return true, false }
|
func canBeArgRet(comp *compiler, t *ast.Type) (bool, bool) { return true, true }
|
|
var typeInt = &typeDesc{
|
Names: typeArgBase.Type.Names,
|
CanBeArgRet: canBeArg,
|
CanBeTypedef: true,
|
AllowColon: true,
|
ResourceBase: true,
|
OptArgs: 1,
|
Args: []namedArg{{Name: "range", Type: typeArgIntRange}},
|
Check: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
|
typeArgBase.Type.Check(comp, t)
|
},
|
Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
size, be := comp.parseIntType(t.Ident)
|
kind, rangeBegin, rangeEnd := prog.IntPlain, uint64(0), uint64(0)
|
if len(args) > 0 {
|
kind, rangeBegin, rangeEnd = prog.IntRange, args[0].Value, args[0].Value2
|
}
|
base.TypeSize = size
|
return &prog.IntType{
|
IntTypeCommon: genIntCommon(base.TypeCommon, t.Value2, be),
|
Kind: kind,
|
RangeBegin: rangeBegin,
|
RangeEnd: rangeEnd,
|
}
|
},
|
}
|
|
var typePtr = &typeDesc{
|
Names: []string{"ptr", "ptr64"},
|
CanBeArgRet: canBeArg,
|
CanBeTypedef: true,
|
Args: []namedArg{{Name: "direction", Type: typeArgDir}, {Name: "type", Type: typeArgType}},
|
Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
base.ArgDir = prog.DirIn // pointers are always in
|
base.TypeSize = comp.ptrSize
|
if t.Ident == "ptr64" {
|
base.TypeSize = 8
|
}
|
return &prog.PtrType{
|
TypeCommon: base.TypeCommon,
|
Type: comp.genType(args[1], "", genDir(args[0]), false),
|
}
|
},
|
}
|
|
var typeVoid = &typeDesc{
|
Names: []string{"void"},
|
CantBeOpt: true,
|
ZeroSize: func(comp *compiler, t *ast.Type, args []*ast.Type) bool {
|
return true
|
},
|
Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
base.TypeSize = 0 // the only type with static size 0
|
return &prog.BufferType{
|
TypeCommon: base.TypeCommon,
|
Kind: prog.BufferBlobRange,
|
RangeBegin: 0,
|
RangeEnd: 0,
|
}
|
},
|
}
|
|
var typeArray = &typeDesc{
|
Names: []string{"array"},
|
CanBeTypedef: true,
|
CantBeOpt: true,
|
OptArgs: 1,
|
Args: []namedArg{{Name: "type", Type: typeArgType}, {Name: "size", Type: typeArgSizeRange}},
|
CheckConsts: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
|
if len(args) > 1 && args[1].Value == 0 && args[1].Value2 == 0 {
|
comp.error(args[1].Pos, "arrays of size 0 are not supported")
|
}
|
},
|
Varlen: func(comp *compiler, t *ast.Type, args []*ast.Type) bool {
|
if comp.isZeroSize(args[0]) {
|
return false
|
}
|
if comp.isVarlen(args[0]) {
|
return true
|
}
|
if len(args) > 1 {
|
return args[1].Value != args[1].Value2
|
}
|
return true
|
},
|
ZeroSize: func(comp *compiler, t *ast.Type, args []*ast.Type) bool {
|
return comp.isZeroSize(args[0])
|
},
|
Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
elemType := comp.genType(args[0], "", base.ArgDir, false)
|
kind, begin, end := prog.ArrayRandLen, uint64(0), uint64(0)
|
if len(args) > 1 {
|
kind, begin, end = prog.ArrayRangeLen, args[1].Value, args[1].Value2
|
}
|
if it, ok := elemType.(*prog.IntType); ok && it.Kind == prog.IntPlain && it.TypeSize == 1 {
|
// Special case: buffer is better mutated.
|
bufKind := prog.BufferBlobRand
|
base.TypeSize = 0
|
if kind == prog.ArrayRangeLen {
|
bufKind = prog.BufferBlobRange
|
if begin == end {
|
base.TypeSize = begin * elemType.Size()
|
}
|
}
|
return &prog.BufferType{
|
TypeCommon: base.TypeCommon,
|
Kind: bufKind,
|
RangeBegin: begin,
|
RangeEnd: end,
|
}
|
}
|
// TypeSize is assigned later in genStructDescs.
|
return &prog.ArrayType{
|
TypeCommon: base.TypeCommon,
|
Type: elemType,
|
Kind: kind,
|
RangeBegin: begin,
|
RangeEnd: end,
|
}
|
},
|
}
|
|
var typeLen = &typeDesc{
|
Names: []string{"len", "bytesize", "bytesize2", "bytesize4", "bytesize8", "bitsize"},
|
CanBeArgRet: canBeArg,
|
CantBeOpt: true,
|
NeedBase: true,
|
Args: []namedArg{{Name: "len target", Type: typeArgLenTarget}},
|
Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
var bitSize uint64
|
switch t.Ident {
|
case "bytesize":
|
bitSize = 8
|
case "bytesize2", "bytesize4", "bytesize8":
|
byteSize, _ := strconv.ParseUint(t.Ident[8:], 10, 8)
|
bitSize = byteSize * 8
|
case "bitsize":
|
bitSize = 1
|
}
|
return &prog.LenType{
|
IntTypeCommon: base,
|
Buf: args[0].Ident,
|
BitSize: bitSize,
|
}
|
},
|
}
|
|
var typeConst = &typeDesc{
|
Names: []string{"const"},
|
CanBeArgRet: canBeArg,
|
CanBeTypedef: true,
|
CantBeOpt: true,
|
NeedBase: true,
|
Args: []namedArg{{Name: "value", Type: typeArgInt}},
|
Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
return &prog.ConstType{
|
IntTypeCommon: base,
|
Val: args[0].Value,
|
}
|
},
|
}
|
|
var typeArgLenTarget = &typeArg{
|
Kind: kindIdent,
|
}
|
|
var typeFlags = &typeDesc{
|
Names: []string{"flags"},
|
CanBeArgRet: canBeArg,
|
CanBeTypedef: true,
|
CantBeOpt: true,
|
NeedBase: true,
|
Args: []namedArg{{Name: "flags", Type: typeArgFlags}},
|
Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
name := args[0].Ident
|
base.TypeName = name
|
f := comp.intFlags[name]
|
if len(f.Values) == 0 {
|
// We can get this if all values are unsupported consts.
|
return &prog.IntType{
|
IntTypeCommon: base,
|
Kind: prog.IntPlain,
|
}
|
}
|
bitmask := true
|
var combined uint64
|
values := genIntArray(f.Values)
|
for _, v := range values {
|
if v&combined != 0 {
|
bitmask = false
|
break
|
}
|
combined |= v
|
}
|
return &prog.FlagsType{
|
IntTypeCommon: base,
|
Vals: values,
|
BitMask: bitmask,
|
}
|
},
|
}
|
|
var typeArgFlags = &typeArg{
|
Kind: kindIdent,
|
Check: func(comp *compiler, t *ast.Type) {
|
if comp.intFlags[t.Ident] == nil {
|
comp.error(t.Pos, "unknown flags %v", t.Ident)
|
return
|
}
|
},
|
}
|
|
var typeFileoff = &typeDesc{
|
Names: []string{"fileoff"},
|
CanBeArgRet: canBeArg,
|
CantBeOpt: true,
|
NeedBase: true,
|
Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
return &prog.IntType{
|
IntTypeCommon: base,
|
Kind: prog.IntFileoff,
|
}
|
},
|
}
|
|
var typeVMA = &typeDesc{
|
Names: []string{"vma"},
|
CanBeArgRet: canBeArg,
|
OptArgs: 1,
|
Args: []namedArg{{Name: "size range", Type: typeArgSizeRange}},
|
Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
begin, end := uint64(0), uint64(0)
|
if len(args) > 0 {
|
begin, end = args[0].Value, args[0].Value2
|
}
|
base.TypeSize = comp.ptrSize
|
return &prog.VmaType{
|
TypeCommon: base.TypeCommon,
|
RangeBegin: begin,
|
RangeEnd: end,
|
}
|
},
|
}
|
|
var typeCsum = &typeDesc{
|
Names: []string{"csum"},
|
NeedBase: true,
|
CantBeOpt: true,
|
OptArgs: 1,
|
Args: []namedArg{
|
{Name: "csum target", Type: typeArgLenTarget},
|
{Name: "kind", Type: typeArgCsumType},
|
{Name: "proto", Type: typeArgInt},
|
},
|
Check: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
|
if len(args) > 2 && genCsumKind(args[1]) != prog.CsumPseudo {
|
comp.error(args[2].Pos, "only pseudo csum can have proto")
|
}
|
},
|
Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
var proto uint64
|
if len(args) > 2 {
|
proto = args[2].Value
|
}
|
return &prog.CsumType{
|
IntTypeCommon: base,
|
Buf: args[0].Ident,
|
Kind: genCsumKind(args[1]),
|
Protocol: proto,
|
}
|
},
|
}
|
|
var typeArgCsumType = &typeArg{
|
Kind: kindIdent,
|
Names: []string{"inet", "pseudo"},
|
}
|
|
func genCsumKind(t *ast.Type) prog.CsumKind {
|
switch t.Ident {
|
case "inet":
|
return prog.CsumInet
|
case "pseudo":
|
return prog.CsumPseudo
|
default:
|
panic(fmt.Sprintf("unknown csum kind %q", t.Ident))
|
}
|
}
|
|
var typeProc = &typeDesc{
|
Names: []string{"proc"},
|
CanBeArgRet: canBeArg,
|
CanBeTypedef: true,
|
NeedBase: true,
|
Args: []namedArg{
|
{Name: "range start", Type: typeArgInt},
|
{Name: "per-proc values", Type: typeArgInt},
|
},
|
CheckConsts: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
|
start := args[0].Value
|
perProc := args[1].Value
|
if perProc == 0 {
|
comp.error(args[1].Pos, "proc per-process values must not be 0")
|
return
|
}
|
size := base.TypeSize * 8
|
max := uint64(1) << size
|
if size == 64 {
|
max = ^uint64(0)
|
}
|
if start >= max {
|
comp.error(args[0].Pos, "values starting from %v overflow base type", start)
|
} else if perProc > (max-start)/prog.MaxPids {
|
comp.error(args[0].Pos, "values starting from %v with step %v overflow base type for %v procs",
|
start, perProc, prog.MaxPids)
|
}
|
},
|
Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
return &prog.ProcType{
|
IntTypeCommon: base,
|
ValuesStart: args[0].Value,
|
ValuesPerProc: args[1].Value,
|
}
|
},
|
}
|
|
var typeText = &typeDesc{
|
Names: []string{"text"},
|
CantBeOpt: true,
|
Args: []namedArg{{Name: "kind", Type: typeArgTextType}},
|
Varlen: func(comp *compiler, t *ast.Type, args []*ast.Type) bool {
|
return true
|
},
|
Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
base.TypeSize = 0
|
return &prog.BufferType{
|
TypeCommon: base.TypeCommon,
|
Kind: prog.BufferText,
|
Text: genTextType(args[0]),
|
}
|
},
|
}
|
|
var typeArgTextType = &typeArg{
|
Kind: kindIdent,
|
Names: []string{"x86_real", "x86_16", "x86_32", "x86_64", "arm64"},
|
}
|
|
func genTextType(t *ast.Type) prog.TextKind {
|
switch t.Ident {
|
case "x86_real":
|
return prog.TextX86Real
|
case "x86_16":
|
return prog.TextX86bit16
|
case "x86_32":
|
return prog.TextX86bit32
|
case "x86_64":
|
return prog.TextX86bit64
|
case "arm64":
|
return prog.TextArm64
|
default:
|
panic(fmt.Sprintf("unknown text type %q", t.Ident))
|
}
|
}
|
|
var typeBuffer = &typeDesc{
|
Names: []string{"buffer"},
|
CanBeArgRet: canBeArg,
|
Args: []namedArg{{Name: "direction", Type: typeArgDir}},
|
Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
base.TypeSize = comp.ptrSize
|
common := genCommon("", "", 0, genDir(args[0]), false)
|
// BufferBlobRand is always varlen.
|
common.IsVarlen = true
|
return &prog.PtrType{
|
TypeCommon: base.TypeCommon,
|
Type: &prog.BufferType{
|
TypeCommon: common,
|
Kind: prog.BufferBlobRand,
|
},
|
}
|
},
|
}
|
|
const (
|
stringnoz = "stringnoz"
|
)
|
|
var typeString = &typeDesc{
|
Names: []string{"string", stringnoz},
|
CanBeTypedef: true,
|
OptArgs: 2,
|
Args: []namedArg{
|
{Name: "literal or flags", Type: typeArgStringFlags},
|
{Name: "size", Type: typeArgInt},
|
},
|
Check: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
|
if t.Ident == stringnoz && len(args) > 1 {
|
comp.error(args[0].Pos, "fixed-size string can't be non-zero-terminated")
|
}
|
},
|
CheckConsts: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
|
if len(args) > 1 {
|
size := args[1].Value
|
vals := comp.genStrings(t, args)
|
for _, s := range vals {
|
if uint64(len(s)) > size {
|
comp.error(args[0].Pos, "string value %q exceeds buffer length %v",
|
s, size)
|
}
|
}
|
}
|
},
|
Varlen: func(comp *compiler, t *ast.Type, args []*ast.Type) bool {
|
return comp.stringSize(t, args) == varlenString
|
},
|
ZeroSize: func(comp *compiler, t *ast.Type, args []*ast.Type) bool {
|
return comp.stringSize(t, args) == 0
|
},
|
Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
if len(args) > 0 && args[0].Ident == "filename" {
|
base.TypeName = "filename"
|
base.TypeSize = 0
|
if len(args) >= 2 {
|
base.TypeSize = args[1].Value
|
}
|
return &prog.BufferType{
|
TypeCommon: base.TypeCommon,
|
Kind: prog.BufferFilename,
|
NoZ: t.Ident == stringnoz,
|
}
|
}
|
subkind := ""
|
if len(args) > 0 && args[0].Ident != "" {
|
subkind = args[0].Ident
|
}
|
vals := comp.genStrings(t, args)
|
base.TypeSize = comp.stringSize(t, args)
|
if base.TypeSize == varlenString {
|
base.TypeSize = 0
|
}
|
return &prog.BufferType{
|
TypeCommon: base.TypeCommon,
|
Kind: prog.BufferString,
|
SubKind: subkind,
|
Values: vals,
|
NoZ: t.Ident == stringnoz,
|
}
|
},
|
}
|
|
func (comp *compiler) genStrings(t *ast.Type, args []*ast.Type) []string {
|
var vals []string
|
if len(args) > 0 {
|
if args[0].HasString {
|
vals = append(vals, args[0].String)
|
} else {
|
vals = genStrArray(comp.strFlags[args[0].Ident].Values)
|
}
|
}
|
if t.Ident == stringnoz {
|
return vals
|
}
|
var size uint64
|
if len(args) > 1 {
|
size = args[1].Value
|
}
|
for i, s := range vals {
|
s += "\x00"
|
for uint64(len(s)) < size {
|
s += "\x00"
|
}
|
vals[i] = s
|
}
|
return vals
|
}
|
|
const varlenString = ^uint64(0)
|
|
// stringSize returns static string size, or varlenString if it is variable length.
|
func (comp *compiler) stringSize(t *ast.Type, args []*ast.Type) uint64 {
|
switch len(args) {
|
case 0:
|
return varlenString // a random string
|
case 1:
|
var z uint64
|
if t.Ident == "string" {
|
z = 1
|
}
|
if args[0].HasString {
|
return uint64(len(args[0].String)) + z // string constant
|
}
|
size := varlenString
|
for _, s := range comp.strFlags[args[0].Ident].Values {
|
s1 := uint64(len(s.Value)) + z
|
if size != varlenString && size != s1 {
|
return varlenString // strings of different lengths
|
}
|
size = s1
|
}
|
return size // all strings have the same length
|
case 2:
|
return args[1].Value // have explicit length
|
default:
|
panic("too many string args")
|
}
|
}
|
|
var typeArgStringFlags = &typeArg{
|
Check: func(comp *compiler, t *ast.Type) {
|
if !t.HasString && t.Ident == "" {
|
comp.error(t.Pos, "unexpected int %v, string arg must be a string literal or string flags", t.Value)
|
return
|
}
|
if t.Ident != "" && comp.strFlags[t.Ident] == nil {
|
comp.error(t.Pos, "unknown string flags %v", t.Ident)
|
return
|
}
|
},
|
}
|
|
var typeFmt = &typeDesc{
|
Names: []string{"fmt"},
|
CanBeTypedef: true,
|
CantBeOpt: true,
|
Args: []namedArg{
|
{Name: "format", Type: typeFmtFormat},
|
{Name: "value", Type: typeArgType, IsArg: true},
|
},
|
Check: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
|
desc, _, _ := comp.getArgsBase(args[1], "", base.TypeCommon.ArgDir, true)
|
switch desc {
|
case typeResource, typeInt, typeLen, typeFlags, typeProc:
|
default:
|
comp.error(t.Pos, "bad fmt value %v, expect an integer", args[1].Ident)
|
return
|
}
|
},
|
Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
var format prog.BinaryFormat
|
var size uint64
|
switch args[0].Ident {
|
case "dec":
|
format = prog.FormatStrDec
|
size = 20
|
case "hex":
|
format = prog.FormatStrHex
|
size = 18
|
case "oct":
|
format = prog.FormatStrOct
|
size = 23
|
}
|
typ := comp.genType(args[1], "", base.TypeCommon.ArgDir, true)
|
switch t := typ.(type) {
|
case *prog.ResourceType:
|
t.ArgFormat = format
|
t.TypeSize = size
|
case *prog.IntType:
|
t.ArgFormat = format
|
t.TypeSize = size
|
case *prog.LenType:
|
t.ArgFormat = format
|
t.TypeSize = size
|
case *prog.FlagsType:
|
t.ArgFormat = format
|
t.TypeSize = size
|
case *prog.ProcType:
|
t.ArgFormat = format
|
t.TypeSize = size
|
default:
|
panic(fmt.Sprintf("unexpected type: %#v", typ))
|
}
|
return typ
|
},
|
}
|
|
var typeFmtFormat = &typeArg{
|
Names: []string{"dec", "hex", "oct"},
|
Kind: kindIdent,
|
}
|
|
// typeArgType is used as placeholder for any type (e.g. ptr target type).
|
var typeArgType = &typeArg{}
|
|
var typeResource = &typeDesc{
|
// No Names, but getTypeDesc knows how to match it.
|
CanBeArgRet: canBeArgRet,
|
ResourceBase: true,
|
// Gen is assigned below to avoid initialization loop.
|
}
|
|
func init() {
|
typeResource.Gen = func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
// Find and generate base type to get its size.
|
var baseType *ast.Type
|
for r := comp.resources[t.Ident]; r != nil; {
|
baseType = r.Base
|
r = comp.resources[r.Base.Ident]
|
}
|
baseProgType := comp.genType(baseType, "", prog.DirIn, false)
|
base.TypeSize = baseProgType.Size()
|
return &prog.ResourceType{
|
TypeCommon: base.TypeCommon,
|
ArgFormat: baseProgType.Format(),
|
}
|
}
|
}
|
|
var typeStruct = &typeDesc{
|
// No Names, but getTypeDesc knows how to match it.
|
CantBeOpt: true,
|
CanBeTypedef: true,
|
// Varlen/Gen are assigned below due to initialization cycle.
|
}
|
|
func init() {
|
typeStruct.CanBeArgRet = func(comp *compiler, t *ast.Type) (bool, bool) {
|
// Allow unions to be arg if all options can be arg.
|
s := comp.structs[t.Ident]
|
if !s.IsUnion {
|
return false, false
|
}
|
canBeArg := true
|
for _, fld := range s.Fields {
|
desc := comp.getTypeDesc(fld.Type)
|
if desc == nil || desc.CanBeArgRet == nil {
|
return false, false
|
}
|
canBeArg1, _ := desc.CanBeArgRet(comp, fld.Type)
|
if !canBeArg1 {
|
canBeArg = false
|
}
|
}
|
return canBeArg, false
|
}
|
typeStruct.Varlen = func(comp *compiler, t *ast.Type, args []*ast.Type) bool {
|
return comp.structIsVarlen(t.Ident)
|
}
|
typeStruct.ZeroSize = func(comp *compiler, t *ast.Type, args []*ast.Type) bool {
|
for _, fld := range comp.structs[t.Ident].Fields {
|
if !comp.isZeroSize(fld.Type) {
|
return false
|
}
|
}
|
return true
|
}
|
typeStruct.Gen = func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
s := comp.structs[t.Ident]
|
key := prog.StructKey{
|
Name: t.Ident,
|
Dir: base.ArgDir,
|
}
|
desc := comp.structDescs[key]
|
if desc == nil {
|
// Need to assign to structDescs before calling genStructDesc to break recursion.
|
desc = new(prog.StructDesc)
|
comp.structDescs[key] = desc
|
comp.genStructDesc(desc, s, base.ArgDir, typeStruct.Varlen(comp, t, args))
|
}
|
if s.IsUnion {
|
return &prog.UnionType{
|
Key: key,
|
FldName: base.FldName,
|
StructDesc: desc,
|
}
|
}
|
return &prog.StructType{
|
Key: key,
|
FldName: base.FldName,
|
StructDesc: desc,
|
}
|
}
|
}
|
|
var typeTypedef = &typeDesc{
|
// No Names, but getTypeDesc knows how to match it.
|
Check: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
|
panic("must not be called")
|
},
|
}
|
|
var typeArgDir = &typeArg{
|
Kind: kindIdent,
|
Names: []string{"in", "out", "inout"},
|
}
|
|
func genDir(t *ast.Type) prog.Dir {
|
switch t.Ident {
|
case "in":
|
return prog.DirIn
|
case "out":
|
return prog.DirOut
|
case "inout":
|
return prog.DirInOut
|
default:
|
panic(fmt.Sprintf("unknown direction %q", t.Ident))
|
}
|
}
|
|
var typeArgInt = &typeArg{
|
Kind: kindInt,
|
}
|
|
var typeArgIntRange = &typeArg{
|
Kind: kindInt,
|
AllowColon: true,
|
CheckConsts: func(comp *compiler, t *ast.Type) {
|
if !t.HasColon {
|
t.Value2 = t.Value
|
t.Value2Fmt = t.ValueFmt
|
}
|
if t.Value2-t.Value > 1<<64-1<<32 {
|
comp.error(t.Pos, "bad int range [%v:%v]", t.Value, t.Value2)
|
}
|
},
|
}
|
|
// Size of array and vma's.
|
var typeArgSizeRange = &typeArg{
|
Kind: kindInt,
|
AllowColon: true,
|
CheckConsts: func(comp *compiler, t *ast.Type) {
|
if !t.HasColon {
|
t.Value2 = t.Value
|
}
|
const maxVal = 1e6
|
if t.Value > t.Value2 || t.Value > maxVal || t.Value2 > maxVal {
|
comp.error(t.Pos, "bad size range [%v:%v]", t.Value, t.Value2)
|
}
|
},
|
}
|
|
// Base type of const/len/etc. Same as typeInt, but can't have range.
|
var typeArgBase = namedArg{
|
Name: "base type",
|
Type: &typeArg{
|
Names: []string{"int8", "int16", "int32", "int64", "int16be", "int32be", "int64be", "intptr"},
|
AllowColon: true,
|
Check: func(comp *compiler, t *ast.Type) {
|
if t.HasColon {
|
if t.Ident2 != "" {
|
comp.error(t.Pos2, "literal const bitfield sizes are not supported")
|
return
|
}
|
if t.Value2 == 0 {
|
// This was not supported historically
|
// and does not work the way C bitfields of size 0 work.
|
// We could allow this, but then we need to make
|
// this work the way C bitfields work.
|
comp.error(t.Pos2, "bitfields of size 0 are not supported")
|
}
|
size, _ := comp.parseIntType(t.Ident)
|
if t.Value2 > size*8 {
|
comp.error(t.Pos2, "bitfield of size %v is too large for base type of size %v",
|
t.Value2, size*8)
|
}
|
}
|
},
|
},
|
}
|
|
var (
|
builtinTypes = make(map[string]*typeDesc)
|
builtinTypedefs = make(map[string]*ast.TypeDef)
|
builtinStrFlags = make(map[string]*ast.StrFlags)
|
|
// To avoid weird cases like ptr[in, in] and ptr[out, opt].
|
reservedName = map[string]bool{
|
"opt": true,
|
"in": true,
|
"out": true,
|
"inout": true,
|
}
|
)
|
|
const builtinDefs = `
|
type bool8 int8[0:1]
|
type bool16 int16[0:1]
|
type bool32 int32[0:1]
|
type bool64 int64[0:1]
|
type boolptr intptr[0:1]
|
|
type filename string[filename]
|
filename = "", "."
|
|
type optional[T] [
|
val T
|
void void
|
] [varlen]
|
`
|
|
func init() {
|
builtins := []*typeDesc{
|
typeInt,
|
typePtr,
|
typeVoid,
|
typeArray,
|
typeLen,
|
typeConst,
|
typeFlags,
|
typeFileoff,
|
typeVMA,
|
typeCsum,
|
typeProc,
|
typeText,
|
typeBuffer,
|
typeString,
|
typeFmt,
|
}
|
for _, desc := range builtins {
|
for _, name := range desc.Names {
|
if builtinTypes[name] != nil {
|
panic(fmt.Sprintf("duplicate builtin type %q", name))
|
}
|
builtinTypes[name] = desc
|
}
|
}
|
builtinDesc := ast.Parse([]byte(builtinDefs), "builtins", func(pos ast.Pos, msg string) {
|
panic(fmt.Sprintf("failed to parse builtins: %v: %v", pos, msg))
|
})
|
for _, decl := range builtinDesc.Nodes {
|
switch n := decl.(type) {
|
case *ast.TypeDef:
|
builtinTypedefs[n.Name.Name] = n
|
case *ast.StrFlags:
|
builtinStrFlags[n.Name.Name] = n
|
case *ast.NewLine:
|
default:
|
panic(fmt.Sprintf("unexpected node in builtins: %#v", n))
|
}
|
}
|
}
|
