1 files changed, 38 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/location.go b/src/cmd/compile/internal/ssa/location.go
new file mode 100644
index 0000000000..85f525565b
--- /dev/null
+++ b/src/cmd/compile/internal/ssa/location.go
@@ -0,0 +1,38 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ssa
+
+import "fmt"
+
+// A place that an ssa variable can reside.
+type Location interface {
+	Name() string // name to use in assembly templates: %rax, 16(%rsp), ...
+}
+
+// A Register is a machine register, like %rax.
+// They are numbered densely from 0 (for each architecture).
+type Register struct {
+	Num  int32
+	name string
+}
+
+func (r *Register) Name() string {
+	return r.name
+}
+
+// A LocalSlot is a location in the stack frame.
+// It is (possibly a subpiece of) a PPARAM, PPARAMOUT, or PAUTO ONAME node.
+type LocalSlot struct {
+	N    GCNode // an ONAME *gc.Node representing a variable on the stack
+	Type Type   // type of slot
+	Off  int64  // offset of slot in N
+}
+
+func (s LocalSlot) Name() string {
+	if s.Off == 0 {
+		return fmt.Sprintf("%s[%s]", s.N, s.Type)
+	}
+	return fmt.Sprintf("%s+%d[%s]", s.N, s.Off, s.Type)
+}