1 files changed, 0 insertions, 203 deletions
diff --git a/usr/austin/eval/scope.go b/usr/austin/eval/scope.go
deleted file mode 100644
index 7ee4a8915..000000000
--- a/usr/austin/eval/scope.go
+++ /dev/null
@@ -1,203 +0,0 @@
-// 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 (
-	"go/token";
-	"log";
-)
-
-/*
- * Blocks and scopes
- */
-
-// A definition can be a *Variable, *Constant, or Type.
-type Def interface {
-	Pos() token.Position;
-}
-
-type Variable struct {
-	token.Position;
-	// Index of this variable in the Frame structure
-	Index int;
-	// Static type of this variable
-	Type Type;
-	// Value of this variable.  This is only used by Scope.NewFrame;
-	// therefore, it is useful for global scopes but cannot be used
-	// in function scopes.
-	Init Value;
-}
-
-type Constant struct {
-	token.Position;
-	Type Type;
-	Value Value;
-}
-
-// A block represents a definition block in which a name may not be
-// defined more than once.
-type block struct {
-	// The block enclosing this one, including blocks in other
-	// scopes.
-	outer *block;
-	// The nested block currently being compiled, or nil.
-	inner *block;
-	// The Scope containing this block.
-	scope *Scope;
-	// The Variables, Constants, and Types defined in this block.
-	defs map[string] Def;
-	// The index of the first variable defined in this block.
-	// This must be greater than the index of any variable defined
-	// in any parent of this block within the same Scope at the
-	// time this block is entered.
-	offset int;
-	// The number of Variables defined in this block.
-	numVars int;
-	// If global, do not allocate new vars and consts in
-	// the frame; assume that the refs will be compiled in
-	// using defs[name].Init.
-	global bool;
-}
-
-// A Scope is the compile-time analogue of a Frame, which captures
-// some subtree of blocks.
-type Scope struct {
-	// The root block of this scope.
-	*block;
-	// The maximum number of variables required at any point in
-	// this Scope.  This determines the number of slots needed in
-	// Frame's created from this Scope at run-time.
-	maxVars int;
-}
-
-func (b *block) enterChild() *block {
-	if b.inner != nil && b.inner.scope == b.scope {
-		log.Crash("Failed to exit child block before entering another child");
-	}
-	sub := &block{
-		outer: b,
-		scope: b.scope,
-		defs: make(map[string] Def),
-		offset: b.offset+b.numVars,
-	};
-	b.inner = sub;
-	return sub;
-}
-
-func (b *block) exit() {
-	if b.outer == nil {
-		log.Crash("Cannot exit top-level block");
-	}
-	if b.outer.scope == b.scope {
-		if b.outer.inner != b {
-			log.Crash("Already exited block");
-		}
-		if b.inner != nil && b.inner.scope == b.scope {
-			log.Crash("Exit of parent block without exit of child block");
-		}
-	}
-	b.outer.inner = nil;
-}
-
-func (b *block) ChildScope() *Scope {
-	if b.inner != nil && b.inner.scope == b.scope {
-		log.Crash("Failed to exit child block before entering a child scope");
-	}
-	sub := b.enterChild();
-	sub.offset = 0;
-	sub.scope = &Scope{sub, 0};
-	return sub.scope;
-}
-
-func (b *block) DefineVar(name string, pos token.Position, t Type) (*Variable, Def) {
-	if prev, ok := b.defs[name]; ok {
-		return nil, prev;
-	}
-	v := b.defineSlot(t, false);
-	v.Position = pos;
-	b.defs[name] = v;
-	return v, nil;
-}
-
-func (b *block) DefineTemp(t Type) *Variable {
-	return b.defineSlot(t, true)
-}
-
-func (b *block) defineSlot(t Type, temp bool) *Variable {
-	if b.inner != nil && b.inner.scope == b.scope {
-		log.Crash("Failed to exit child block before defining variable");
-	}
-	index := -1;
-	if !b.global || temp {
-		index = b.offset+b.numVars;
-		b.numVars++;
-		if index >= b.scope.maxVars {
-			b.scope.maxVars = index+1;
-		}
-	}
-	v := &Variable{token.Position{}, index, t, nil};
-	return v;
-}
-
-func (b *block) DefineConst(name string, pos token.Position, t Type, v Value) (*Constant, Def) {
-	if prev, ok := b.defs[name]; ok {
-		return nil, prev;
-	}
-	c := &Constant{pos, t, v};
-	b.defs[name] = c;
-	return c, nil;
-}
-
-func (b *block) DefineType(name string, pos token.Position, t Type) Type {
-	if _, ok := b.defs[name]; ok {
-		return nil;
-	}
-	nt := &NamedType{pos, name, nil, true, make(map[string] Method)};
-	if t != nil {
-		nt.Complete(t);
-	}
-	b.defs[name] = nt;
-	return nt;
-}
-
-func (b *block) Lookup(name string) (bl *block, level int, def Def) {
-	for b != nil {
-		if d, ok := b.defs[name]; ok {
-			return b, level, d;
-		}
-		if b.outer != nil && b.scope != b.outer.scope {
-			level++;
-		}
-		b = b.outer;
-	}
-	return nil, 0, nil;
-}
-
-func (s *Scope) NewFrame(outer *Frame) *Frame {
-	return outer.child(s.maxVars);
-}
-
-/*
- * Frames
- */
-
-type Frame struct {
-	Outer *Frame;
-	Vars []Value;
-}
-
-func (f *Frame) Get(level int, index int) Value {
-	for ; level > 0; level-- {
-		f = f.Outer;
-	}
-	return f.Vars[index];
-}
-
-func (f *Frame) child(numVars int) *Frame {
-	// TODO(austin) This is probably rather expensive.  All values
-	// require heap allocation and zeroing them when we execute a
-	// definition typically requires some computation.
-	return &Frame{f, make([]Value, numVars)};
-}