1 files changed, 124 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/noder/codes.go b/src/cmd/compile/internal/noder/codes.go
new file mode 100644
index 0000000000..f8cb7729ac
--- /dev/null
+++ b/src/cmd/compile/internal/noder/codes.go
@@ -0,0 +1,124 @@
+// UNREVIEWED
+
+// Copyright 2021 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 noder
+
+type code interface {
+	marker() syncMarker
+	value() int
+}
+
+type codeVal int
+
+func (c codeVal) marker() syncMarker { return syncVal }
+func (c codeVal) value() int         { return int(c) }
+
+const (
+	valBool codeVal = iota
+	valString
+	valInt64
+	valBigInt
+	valBigRat
+	valBigFloat
+)
+
+type codeType int
+
+func (c codeType) marker() syncMarker { return syncType }
+func (c codeType) value() int         { return int(c) }
+
+const (
+	typeBasic codeType = iota
+	typeNamed
+	typePointer
+	typeSlice
+	typeArray
+	typeChan
+	typeMap
+	typeSignature
+	typeStruct
+	typeInterface
+	typeUnion
+	typeTypeParam
+)
+
+type codeObj int
+
+func (c codeObj) marker() syncMarker { return syncCodeObj }
+func (c codeObj) value() int         { return int(c) }
+
+const (
+	objAlias codeObj = iota
+	objConst
+	objType
+	objFunc
+	objVar
+	objStub
+)
+
+type codeStmt int
+
+func (c codeStmt) marker() syncMarker { return syncStmt1 }
+func (c codeStmt) value() int         { return int(c) }
+
+const (
+	stmtEnd codeStmt = iota
+	stmtLabel
+	stmtBlock
+	stmtExpr
+	stmtSend
+	stmtAssign
+	stmtAssignOp
+	stmtIncDec
+	stmtBranch
+	stmtCall
+	stmtReturn
+	stmtIf
+	stmtFor
+	stmtSwitch
+	stmtSelect
+
+	// TODO(mdempsky): Remove after we don't care about toolstash -cmp.
+	stmtTypeDeclHack
+)
+
+type codeExpr int
+
+func (c codeExpr) marker() syncMarker { return syncExpr }
+func (c codeExpr) value() int         { return int(c) }
+
+// TODO(mdempsky): Split expr into addr, for lvalues.
+const (
+	exprNone codeExpr = iota
+	exprConst
+	exprType  // type expression
+	exprLocal // local variable
+	exprName  // global variable or function
+	exprBlank
+	exprCompLit
+	exprFuncLit
+	exprSelector
+	exprIndex
+	exprSlice
+	exprAssert
+	exprUnaryOp
+	exprBinaryOp
+	exprCall
+	exprConvert
+)
+
+type codeDecl int
+
+func (c codeDecl) marker() syncMarker { return syncDecl }
+func (c codeDecl) value() int         { return int(c) }
+
+const (
+	declEnd codeDecl = iota
+	declFunc
+	declMethod
+	declVar
+	declOther
+)