1 files changed, 92 insertions, 0 deletions
diff --git a/libgo/go/exp/eval/compiler.go b/libgo/go/exp/eval/compiler.go
new file mode 100644
index 000000000..9d2923bfc
--- /dev/null
+++ b/libgo/go/exp/eval/compiler.go
@@ -0,0 +1,92 @@
+// Copyright 2009 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 eval
+
+import (
+	"fmt"
+	"go/scanner"
+	"go/token"
+)
+
+
+// A compiler captures information used throughout an entire
+// compilation.  Currently it includes only the error handler.
+//
+// TODO(austin) This might actually represent package level, in which
+// case it should be package compiler.
+type compiler struct {
+	fset         *token.FileSet
+	errors       scanner.ErrorHandler
+	numErrors    int
+	silentErrors int
+}
+
+func (a *compiler) diagAt(pos token.Pos, format string, args ...interface{}) {
+	a.errors.Error(a.fset.Position(pos), fmt.Sprintf(format, args...))
+	a.numErrors++
+}
+
+func (a *compiler) numError() int { return a.numErrors + a.silentErrors }
+
+// The universal scope
+func newUniverse() *Scope {
+	sc := &Scope{nil, 0}
+	sc.block = &block{
+		offset: 0,
+		scope:  sc,
+		global: true,
+		defs:   make(map[string]Def),
+	}
+	return sc
+}
+
+var universe *Scope = newUniverse()
+
+
+// TODO(austin) These can all go in stmt.go now
+type label struct {
+	name string
+	desc string
+	// The PC goto statements should jump to, or nil if this label
+	// cannot be goto'd (such as an anonymous for loop label).
+	gotoPC *uint
+	// The PC break statements should jump to, or nil if a break
+	// statement is invalid.
+	breakPC *uint
+	// The PC continue statements should jump to, or nil if a
+	// continue statement is invalid.
+	continuePC *uint
+	// The position where this label was resolved.  If it has not
+	// been resolved yet, an invalid position.
+	resolved token.Pos
+	// The position where this label was first jumped to.
+	used token.Pos
+}
+
+// A funcCompiler captures information used throughout the compilation
+// of a single function body.
+type funcCompiler struct {
+	*compiler
+	fnType *FuncType
+	// Whether the out variables are named.  This affects what
+	// kinds of return statements are legal.
+	outVarsNamed bool
+	*codeBuf
+	flow   *flowBuf
+	labels map[string]*label
+}
+
+// A blockCompiler captures information used throughout the compilation
+// of a single block within a function.
+type blockCompiler struct {
+	*funcCompiler
+	block *block
+	// The label of this block, used for finding break and
+	// continue labels.
+	label *label
+	// The blockCompiler for the block enclosing this one, or nil
+	// for a function-level block.
+	parent *blockCompiler
+}