diff options
Diffstat (limited to 'src/go/parser/resolver.go')
| -rw-r--r-- | src/go/parser/resolver.go | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/go/parser/resolver.go b/src/go/parser/resolver.go index cf92c7e4f57..f55bdb7f177 100644 --- a/src/go/parser/resolver.go +++ b/src/go/parser/resolver.go @@ -25,6 +25,7 @@ func resolveFile(file *ast.File, handle *token.File, declErr func(token.Pos, str declErr: declErr, topScope: pkgScope, pkgScope: pkgScope, + depth: 1, } for _, decl := range file.Decls { @@ -53,6 +54,8 @@ func resolveFile(file *ast.File, handle *token.File, declErr func(token.Pos, str file.Unresolved = r.unresolved[0:i] } +const maxScopeDepth int = 1e3 + type resolver struct { handle *token.File declErr func(token.Pos, string) @@ -61,6 +64,7 @@ type resolver struct { pkgScope *ast.Scope // pkgScope.Outer == nil topScope *ast.Scope // top-most scope; may be pkgScope unresolved []*ast.Ident // unresolved identifiers + depth int // scope depth // Label scopes // (maintained by open/close LabelScope) @@ -83,6 +87,10 @@ func (r *resolver) sprintf(format string, args ...interface{}) string { } func (r *resolver) openScope(pos token.Pos) { + r.depth++ + if r.depth > maxScopeDepth { + panic(bailout{pos: pos, msg: "exceeded max scope depth during object resolution"}) + } if debugResolve { r.dump("opening scope @%v", pos) } @@ -90,6 +98,7 @@ func (r *resolver) openScope(pos token.Pos) { } func (r *resolver) closeScope() { + r.depth-- if debugResolve { r.dump("closing scope") } |