mirror of
https://github.com/reactos/syzkaller.git
synced 2024-11-27 21:30:33 +00:00
c791837863
Currently we apply big-endian-ness and bitfield-ness in the wrong order in copyin. This leads to totally bogus result. Fix this.
912 lines
24 KiB
Go
912 lines
24 KiB
Go
// Copyright 2017 syzkaller project authors. All rights reserved.
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// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
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package compiler
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import (
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"fmt"
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"strconv"
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"github.com/google/syzkaller/pkg/ast"
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"github.com/google/syzkaller/prog"
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)
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// typeDesc is arg/field type descriptor.
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type typeDesc struct {
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Names []string
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CanBeTypedef bool // can be type alias target?
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CantBeOpt bool // can't be marked as opt?
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NeedBase bool // needs base type when used as field?
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AllowColon bool // allow colon (int8:2) on fields?
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OptArgs int // number of optional arguments in Args array
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Args []namedArg // type arguments
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// CanBeArgRet returns if this type can be syscall argument/return (false if nil).
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CanBeArgRet func(comp *compiler, t *ast.Type) (bool, bool)
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// CanBeResourceBase returns if this type can be a resource base type (false if nil.
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CanBeResourceBase func(comp *compiler, t *ast.Type) bool
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// Check does custom verification of the type (optional, consts are not patched yet).
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Check func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon)
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// CheckConsts does custom verification of the type (optional, consts are patched).
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CheckConsts func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon)
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// Varlen returns if the type is variable-length (false if not set).
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Varlen func(comp *compiler, t *ast.Type, args []*ast.Type) bool
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// ZeroSize returns if the type has static 0 size (false if not set).
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ZeroSize func(comp *compiler, t *ast.Type, args []*ast.Type) bool
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// Gen generates corresponding prog.Type.
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Gen func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type
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}
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// typeArg describes a type argument.
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type typeArg struct {
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Names []string
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Kind int // int/ident/string
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MaxArgs int // maxiumum number of subargs
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AllowColon bool // allow colon (2:3)?
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// Check does custom verification of the arg (optional).
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Check func(comp *compiler, t *ast.Type)
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CheckConsts func(comp *compiler, t *ast.Type)
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}
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type namedArg struct {
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Name string
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Type *typeArg
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IsArg bool // does not need base type
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}
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const (
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kindAny = iota
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kindInt
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kindIdent
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kindString
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)
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func canBeArg(comp *compiler, t *ast.Type) (bool, bool) { return true, false }
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func canBeArgRet(comp *compiler, t *ast.Type) (bool, bool) { return true, true }
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var typeInt = &typeDesc{
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Names: typeArgBase.Type.Names,
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CanBeArgRet: canBeArg,
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CanBeTypedef: true,
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AllowColon: true,
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OptArgs: 1,
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Args: []namedArg{{Name: "range", Type: typeArgIntRange}},
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CanBeResourceBase: func(comp *compiler, t *ast.Type) bool {
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// Big-endian resources can always be converted to non-big-endian,
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// since we will always revert bytes during copyout and during copyin,
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// so the result is the same as not reverting at all.
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// Big-endian resources are also not implemented and don't have tests.
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_, be := comp.parseIntType(t.Ident)
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return !be
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},
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Check: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
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typeArgBase.Type.Check(comp, t)
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},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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size, be := comp.parseIntType(t.Ident)
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kind, rangeBegin, rangeEnd := prog.IntPlain, uint64(0), uint64(0)
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if len(args) > 0 {
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kind, rangeBegin, rangeEnd = prog.IntRange, args[0].Value, args[0].Value2
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}
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base.TypeSize = size
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return &prog.IntType{
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IntTypeCommon: genIntCommon(base.TypeCommon, t.Value2, be),
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Kind: kind,
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RangeBegin: rangeBegin,
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RangeEnd: rangeEnd,
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}
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},
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}
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var typePtr = &typeDesc{
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Names: []string{"ptr", "ptr64"},
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CanBeArgRet: canBeArg,
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CanBeTypedef: true,
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Args: []namedArg{{Name: "direction", Type: typeArgDir}, {Name: "type", Type: typeArgType}},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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base.ArgDir = prog.DirIn // pointers are always in
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base.TypeSize = comp.ptrSize
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if t.Ident == "ptr64" {
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base.TypeSize = 8
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}
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return &prog.PtrType{
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TypeCommon: base.TypeCommon,
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Type: comp.genType(args[1], "", genDir(args[0]), false),
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}
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},
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}
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var typeVoid = &typeDesc{
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Names: []string{"void"},
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CantBeOpt: true,
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ZeroSize: func(comp *compiler, t *ast.Type, args []*ast.Type) bool {
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return true
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},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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base.TypeSize = 0 // the only type with static size 0
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return &prog.BufferType{
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TypeCommon: base.TypeCommon,
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Kind: prog.BufferBlobRange,
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RangeBegin: 0,
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RangeEnd: 0,
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}
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},
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}
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var typeArray = &typeDesc{
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Names: []string{"array"},
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CanBeTypedef: true,
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CantBeOpt: true,
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OptArgs: 1,
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Args: []namedArg{{Name: "type", Type: typeArgType}, {Name: "size", Type: typeArgSizeRange}},
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CheckConsts: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
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if len(args) > 1 && args[1].Value == 0 && args[1].Value2 == 0 {
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comp.error(args[1].Pos, "arrays of size 0 are not supported")
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}
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},
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Varlen: func(comp *compiler, t *ast.Type, args []*ast.Type) bool {
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if comp.isZeroSize(args[0]) {
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return false
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}
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if comp.isVarlen(args[0]) {
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return true
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}
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if len(args) > 1 {
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return args[1].Value != args[1].Value2
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}
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return true
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},
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ZeroSize: func(comp *compiler, t *ast.Type, args []*ast.Type) bool {
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return comp.isZeroSize(args[0])
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},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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elemType := comp.genType(args[0], "", base.ArgDir, false)
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kind, begin, end := prog.ArrayRandLen, uint64(0), uint64(0)
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if len(args) > 1 {
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kind, begin, end = prog.ArrayRangeLen, args[1].Value, args[1].Value2
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}
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if it, ok := elemType.(*prog.IntType); ok && it.Kind == prog.IntPlain && it.TypeSize == 1 {
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// Special case: buffer is better mutated.
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bufKind := prog.BufferBlobRand
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base.TypeSize = 0
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if kind == prog.ArrayRangeLen {
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bufKind = prog.BufferBlobRange
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if begin == end {
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base.TypeSize = begin * elemType.Size()
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}
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}
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return &prog.BufferType{
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TypeCommon: base.TypeCommon,
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Kind: bufKind,
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RangeBegin: begin,
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RangeEnd: end,
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}
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}
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// TypeSize is assigned later in genStructDescs.
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return &prog.ArrayType{
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TypeCommon: base.TypeCommon,
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Type: elemType,
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Kind: kind,
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RangeBegin: begin,
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RangeEnd: end,
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}
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},
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}
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var typeLen = &typeDesc{
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Names: []string{"len", "bytesize", "bytesize2", "bytesize4", "bytesize8", "bitsize"},
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CanBeArgRet: canBeArg,
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CantBeOpt: true,
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NeedBase: true,
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Args: []namedArg{{Name: "len target", Type: typeArgLenTarget}},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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var bitSize uint64
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switch t.Ident {
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case "bytesize":
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bitSize = 8
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case "bytesize2", "bytesize4", "bytesize8":
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byteSize, _ := strconv.ParseUint(t.Ident[8:], 10, 8)
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bitSize = byteSize * 8
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case "bitsize":
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bitSize = 1
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}
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return &prog.LenType{
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IntTypeCommon: base,
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Buf: args[0].Ident,
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BitSize: bitSize,
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}
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},
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}
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var typeConst = &typeDesc{
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Names: []string{"const"},
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CanBeArgRet: canBeArg,
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CanBeTypedef: true,
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CantBeOpt: true,
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NeedBase: true,
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Args: []namedArg{{Name: "value", Type: typeArgInt}},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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return &prog.ConstType{
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IntTypeCommon: base,
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Val: args[0].Value,
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}
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},
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}
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var typeArgLenTarget = &typeArg{
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Kind: kindIdent,
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}
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var typeFlags = &typeDesc{
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Names: []string{"flags"},
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CanBeArgRet: canBeArg,
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CanBeTypedef: true,
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CantBeOpt: true,
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NeedBase: true,
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Args: []namedArg{{Name: "flags", Type: typeArgFlags}},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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name := args[0].Ident
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base.TypeName = name
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f := comp.intFlags[name]
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if len(f.Values) == 0 {
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// We can get this if all values are unsupported consts.
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return &prog.IntType{
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IntTypeCommon: base,
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Kind: prog.IntPlain,
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}
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}
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bitmask := true
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var combined uint64
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values := genIntArray(f.Values)
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for _, v := range values {
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if v&combined != 0 {
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bitmask = false
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break
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}
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combined |= v
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}
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return &prog.FlagsType{
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IntTypeCommon: base,
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Vals: values,
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BitMask: bitmask,
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}
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},
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}
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var typeArgFlags = &typeArg{
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Kind: kindIdent,
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Check: func(comp *compiler, t *ast.Type) {
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if comp.intFlags[t.Ident] == nil {
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comp.error(t.Pos, "unknown flags %v", t.Ident)
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return
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}
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},
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}
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var typeFileoff = &typeDesc{
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Names: []string{"fileoff"},
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CanBeArgRet: canBeArg,
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CantBeOpt: true,
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NeedBase: true,
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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return &prog.IntType{
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IntTypeCommon: base,
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Kind: prog.IntFileoff,
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}
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},
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}
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var typeVMA = &typeDesc{
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Names: []string{"vma", "vma64"},
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CanBeArgRet: canBeArg,
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OptArgs: 1,
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Args: []namedArg{{Name: "size range", Type: typeArgSizeRange}},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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begin, end := uint64(0), uint64(0)
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if len(args) > 0 {
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begin, end = args[0].Value, args[0].Value2
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}
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base.TypeSize = comp.ptrSize
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if t.Ident == "vma64" {
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base.TypeSize = 8
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}
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return &prog.VmaType{
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TypeCommon: base.TypeCommon,
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RangeBegin: begin,
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RangeEnd: end,
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}
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},
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}
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var typeCsum = &typeDesc{
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Names: []string{"csum"},
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NeedBase: true,
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CantBeOpt: true,
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OptArgs: 1,
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Args: []namedArg{
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{Name: "csum target", Type: typeArgLenTarget},
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{Name: "kind", Type: typeArgCsumType},
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{Name: "proto", Type: typeArgInt},
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},
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Check: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
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if len(args) > 2 && genCsumKind(args[1]) != prog.CsumPseudo {
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comp.error(args[2].Pos, "only pseudo csum can have proto")
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}
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},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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var proto uint64
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if len(args) > 2 {
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proto = args[2].Value
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}
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return &prog.CsumType{
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IntTypeCommon: base,
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Buf: args[0].Ident,
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Kind: genCsumKind(args[1]),
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Protocol: proto,
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}
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},
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}
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var typeArgCsumType = &typeArg{
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Kind: kindIdent,
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Names: []string{"inet", "pseudo"},
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}
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func genCsumKind(t *ast.Type) prog.CsumKind {
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switch t.Ident {
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case "inet":
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return prog.CsumInet
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case "pseudo":
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return prog.CsumPseudo
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default:
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panic(fmt.Sprintf("unknown csum kind %q", t.Ident))
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}
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}
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var typeProc = &typeDesc{
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Names: []string{"proc"},
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CanBeArgRet: canBeArg,
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CanBeTypedef: true,
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NeedBase: true,
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Args: []namedArg{
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{Name: "range start", Type: typeArgInt},
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{Name: "per-proc values", Type: typeArgInt},
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},
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CheckConsts: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
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start := args[0].Value
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perProc := args[1].Value
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if perProc == 0 {
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comp.error(args[1].Pos, "proc per-process values must not be 0")
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return
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}
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size := base.TypeSize * 8
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max := uint64(1) << size
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if size == 64 {
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max = ^uint64(0)
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}
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if start >= max {
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comp.error(args[0].Pos, "values starting from %v overflow base type", start)
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} else if perProc > (max-start)/prog.MaxPids {
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comp.error(args[0].Pos, "values starting from %v with step %v overflow base type for %v procs",
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start, perProc, prog.MaxPids)
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}
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},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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return &prog.ProcType{
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IntTypeCommon: base,
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ValuesStart: args[0].Value,
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ValuesPerProc: args[1].Value,
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}
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},
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}
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var typeText = &typeDesc{
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Names: []string{"text"},
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CantBeOpt: true,
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Args: []namedArg{{Name: "kind", Type: typeArgTextType}},
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Varlen: func(comp *compiler, t *ast.Type, args []*ast.Type) bool {
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return true
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},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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base.TypeSize = 0
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return &prog.BufferType{
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TypeCommon: base.TypeCommon,
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Kind: prog.BufferText,
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Text: genTextType(args[0]),
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}
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},
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}
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var typeArgTextType = &typeArg{
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Kind: kindIdent,
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Names: []string{"target", "x86_real", "x86_16", "x86_32", "x86_64", "arm64"},
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}
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func genTextType(t *ast.Type) prog.TextKind {
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switch t.Ident {
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case "target":
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return prog.TextTarget
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case "x86_real":
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return prog.TextX86Real
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case "x86_16":
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return prog.TextX86bit16
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case "x86_32":
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return prog.TextX86bit32
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case "x86_64":
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return prog.TextX86bit64
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case "arm64":
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return prog.TextArm64
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default:
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panic(fmt.Sprintf("unknown text type %q", t.Ident))
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}
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}
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var typeBuffer = &typeDesc{
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Names: []string{"buffer"},
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CanBeArgRet: canBeArg,
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Args: []namedArg{{Name: "direction", Type: typeArgDir}},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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base.TypeSize = comp.ptrSize
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common := genCommon("", "", 0, genDir(args[0]), false)
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// BufferBlobRand is always varlen.
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common.IsVarlen = true
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return &prog.PtrType{
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TypeCommon: base.TypeCommon,
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Type: &prog.BufferType{
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TypeCommon: common,
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Kind: prog.BufferBlobRand,
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},
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}
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},
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}
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const (
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stringnoz = "stringnoz"
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)
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var typeString = &typeDesc{
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Names: []string{"string", stringnoz},
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CanBeTypedef: true,
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OptArgs: 2,
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Args: []namedArg{
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{Name: "literal or flags", Type: typeArgStringFlags},
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{Name: "size", Type: typeArgInt},
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},
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Check: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
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if t.Ident == stringnoz && len(args) > 1 {
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comp.error(args[0].Pos, "fixed-size string can't be non-zero-terminated")
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}
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},
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CheckConsts: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
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if len(args) > 1 {
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size := args[1].Value
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vals := comp.genStrings(t, args)
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for _, s := range vals {
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if uint64(len(s)) > size {
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comp.error(args[0].Pos, "string value %q exceeds buffer length %v",
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s, size)
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}
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}
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}
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},
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Varlen: func(comp *compiler, t *ast.Type, args []*ast.Type) bool {
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return comp.stringSize(t, args) == varlenString
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},
|
|
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,
|
|
CanBeResourceBase: func(comp *compiler, t *ast.Type) bool {
|
|
return 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))
|
|
}
|
|
}
|
|
}
|