diff options
Diffstat (limited to 'src/cmd/compile/internal/noder/writer.go')
| -rw-r--r-- | src/cmd/compile/internal/noder/writer.go | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/noder/writer.go b/src/cmd/compile/internal/noder/writer.go index c5c346b784..0fb162d381 100644 --- a/src/cmd/compile/internal/noder/writer.go +++ b/src/cmd/compile/internal/noder/writer.go @@ -742,6 +742,22 @@ func (w *writer) funcExt(obj *types2.Func) { if pragma&ir.Noescape != 0 { w.p.errorf(decl, "can only use //go:noescape with external func implementations") } + if (pragma&ir.UintptrKeepAlive != 0 && pragma&ir.UintptrEscapes == 0) && pragma&ir.Nosplit == 0 { + // Stack growth can't handle uintptr arguments that may + // be pointers (as we don't know which are pointers + // when creating the stack map). Thus uintptrkeepalive + // functions (and all transitive callees) must be + // nosplit. + // + // N.B. uintptrescapes implies uintptrkeepalive but it + // is OK since the arguments must escape to the heap. + // + // TODO(prattmic): Add recursive nosplit check of callees. + // TODO(prattmic): Functions with no body (i.e., + // assembly) must also be nosplit, but we can't check + // that here. + w.p.errorf(decl, "go:uintptrkeepalive requires go:nosplit") + } } else { if base.Flag.Complete || decl.Name.Value == "init" { // Linknamed functions are allowed to have no body. Hopefully |