mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-12-04 19:19:44 +00:00
bf6aa02dcf
Set default value also for complex (struct, map) types. Note: because VM does not distinguish empty array and nil array, comparison 'a == nil' can't be handled properly without substantial effort. This will be fixed in NEO3.
247 lines
5.5 KiB
Go
247 lines
5.5 KiB
Go
package compiler
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import (
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"fmt"
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"go/ast"
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"go/constant"
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"go/types"
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"golang.org/x/tools/go/loader"
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)
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var (
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// Go language builtin functions and custom builtin utility functions.
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builtinFuncs = []string{
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"len", "append", "SHA256",
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"SHA1", "Hash256", "Hash160",
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"VerifySignature", "AppCall",
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"FromAddress", "Equals",
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"panic", "DynAppCall",
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"delete", "Remove",
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}
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)
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// typeAndValueForField returns a zero initialized typeAndValue for the given type.Var.
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func typeAndValueForField(fld *types.Var) (types.TypeAndValue, error) {
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switch t := fld.Type().(type) {
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case *types.Basic:
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switch t.Kind() {
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case types.Int:
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return types.TypeAndValue{
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Type: t,
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Value: constant.MakeInt64(0),
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}, nil
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case types.String:
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return types.TypeAndValue{
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Type: t,
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Value: constant.MakeString(""),
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}, nil
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case types.Bool, types.UntypedBool:
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return types.TypeAndValue{
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Type: t,
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Value: constant.MakeBool(false),
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}, nil
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default:
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return types.TypeAndValue{}, fmt.Errorf("could not initialize struct field %s to zero, type: %s", fld.Name(), t)
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}
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default:
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return types.TypeAndValue{Type: t}, nil
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}
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}
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// countGlobals counts the global variables in the program to add
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// them with the stack size of the function.
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func countGlobals(f ast.Node) (i int64) {
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ast.Inspect(f, func(node ast.Node) bool {
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switch node.(type) {
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// Skip all function declarations.
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case *ast.FuncDecl:
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return false
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// After skipping all funcDecls we are sure that each value spec
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// is a global declared variable or constant.
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case *ast.ValueSpec:
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i++
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}
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return true
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})
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return
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}
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// isIdentBool looks if the given ident is a boolean.
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func isIdentBool(ident *ast.Ident) bool {
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return ident.Name == "true" || ident.Name == "false"
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}
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// isExprNil looks if the given expression is a `nil`.
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func isExprNil(e ast.Expr) bool {
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v, ok := e.(*ast.Ident)
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return ok && v.Name == "nil"
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}
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// makeBoolFromIdent creates a bool type from an *ast.Ident.
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func makeBoolFromIdent(ident *ast.Ident, tinfo *types.Info) (types.TypeAndValue, error) {
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var b bool
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switch ident.Name {
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case "true":
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b = true
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case "false":
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b = false
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default:
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return types.TypeAndValue{}, fmt.Errorf("givent identifier cannot be converted to a boolean => %s", ident.Name)
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}
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return types.TypeAndValue{
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Type: tinfo.ObjectOf(ident).Type(),
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Value: constant.MakeBool(b),
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}, nil
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}
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// resolveEntryPoint returns the function declaration of the entrypoint and the corresponding file.
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func resolveEntryPoint(entry string, pkg *loader.PackageInfo) (*ast.FuncDecl, *ast.File) {
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var (
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main *ast.FuncDecl
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file *ast.File
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)
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for _, f := range pkg.Files {
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ast.Inspect(f, func(n ast.Node) bool {
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switch t := n.(type) {
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case *ast.FuncDecl:
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if t.Name.Name == entry {
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main = t
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file = f
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return false
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}
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}
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return true
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})
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}
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return main, file
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}
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// indexOfStruct returns the index of the given field inside that struct.
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// If the struct does not contain that field it will return -1.
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func indexOfStruct(strct *types.Struct, fldName string) int {
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for i := 0; i < strct.NumFields(); i++ {
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if strct.Field(i).Name() == fldName {
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return i
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}
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}
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return -1
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}
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type funcUsage map[string]bool
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func (f funcUsage) funcUsed(name string) bool {
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_, ok := f[name]
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return ok
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}
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// lastStmtIsReturn checks if last statement of the declaration was return statement..
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func lastStmtIsReturn(decl *ast.FuncDecl) (b bool) {
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if l := len(decl.Body.List); l != 0 {
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_, ok := decl.Body.List[l-1].(*ast.ReturnStmt)
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return ok
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}
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return false
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}
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func analyzeFuncUsage(pkgs map[*types.Package]*loader.PackageInfo) funcUsage {
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usage := funcUsage{}
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for _, pkg := range pkgs {
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for _, f := range pkg.Files {
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ast.Inspect(f, func(node ast.Node) bool {
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switch n := node.(type) {
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case *ast.CallExpr:
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switch t := n.Fun.(type) {
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case *ast.Ident:
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usage[t.Name] = true
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case *ast.SelectorExpr:
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usage[t.Sel.Name] = true
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}
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}
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return true
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})
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}
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}
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return usage
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}
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func isBuiltin(expr ast.Expr) bool {
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var name string
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switch t := expr.(type) {
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case *ast.Ident:
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name = t.Name
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case *ast.SelectorExpr:
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name = t.Sel.Name
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default:
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return false
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}
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for _, n := range builtinFuncs {
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if name == n {
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return true
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}
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}
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return false
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}
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func (c *codegen) isCompoundArrayType(t ast.Expr) bool {
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switch s := t.(type) {
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case *ast.ArrayType:
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return true
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case *ast.Ident:
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arr, ok := c.typeInfo.Types[s].Type.Underlying().(*types.Slice)
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return ok && !isByte(arr.Elem())
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}
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return false
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}
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func isByte(t types.Type) bool {
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e, ok := t.(*types.Basic)
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return ok && e.Kind() == types.Byte
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}
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func (c *codegen) isStructType(t ast.Expr) (int, bool) {
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switch s := t.(type) {
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case *ast.StructType:
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return s.Fields.NumFields(), true
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case *ast.Ident:
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st, ok := c.typeInfo.Types[s].Type.Underlying().(*types.Struct)
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if ok {
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return st.NumFields(), true
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}
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}
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return 0, false
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}
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func isByteArray(lit *ast.CompositeLit, tInfo *types.Info) bool {
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if len(lit.Elts) == 0 {
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if typ, ok := lit.Type.(*ast.ArrayType); ok {
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if name, ok := typ.Elt.(*ast.Ident); ok {
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return name.Name == "byte" || name.Name == "uint8"
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}
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}
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return false
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}
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typ := tInfo.Types[lit.Elts[0]].Type.Underlying()
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return isByte(typ)
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}
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func isSyscall(fun *funcScope) bool {
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if fun.selector == nil {
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return false
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}
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_, ok := syscalls[fun.selector.Name][fun.name]
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return ok
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}
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func isByteArrayType(t types.Type) bool {
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return t.String() == "[]byte"
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}
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func isStringType(t types.Type) bool {
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return t.String() == "string"
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}
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