Convert interpreter to whole-package compilation.

R=rsc
APPROVED=rsc
DELTA=334  (110 added, 211 deleted, 13 changed)
OCL=33135
CL=33137

11 files changed, 127 insertions, 224 deletions

diff --git a/usr/austin/eval/Makefile b/usr/austin/eval/Makefile
new file mode 100644
index 000000000..3a477710b
--- /dev/null
+++ b/usr/austin/eval/Makefile
@@ -0,0 +1,20 @@
+# 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.
+
+include $(GOROOT)/src/Make.$(GOARCH)
+
+TARG=eval
+GOFILES=\
+	compiler.go\
+	decls.go\
+	expr.go\
+	func.go\
+	scope.go\
+	stmt.go\
+	type.go\
+	typec.go\
+	util.go\
+	value.go\
+
+include $(GOROOT)/src/Make.pkg
diff --git a/usr/austin/eval/compiler.go b/usr/austin/eval/compiler.go
index 82f9120a2..9aa04cbfe 100644
--- a/usr/austin/eval/compiler.go
+++ b/usr/austin/eval/compiler.go
@@ -5,7 +5,6 @@
 package eval
 
 import (
-	"eval";
 	"fmt";
 	"go/ast";
 	"go/scanner";
@@ -31,19 +30,6 @@ func (a *compiler) diagAt(pos positioned, format string, args ...) {
 	a.errors.Error(pos.Pos(), fmt.Sprintf(format, args));
 }
 
-type FuncDecl struct
-func (a *compiler) compileFunc(b *block, decl *FuncDecl, body *ast.BlockStmt) (func (f *Frame) Func)
-type exprCompiler struct
-func (a *compiler) compileExpr(b *block, expr ast.Expr, constant bool) *exprCompiler
-type assignCompiler struct
-func (a *compiler) checkAssign(pos token.Position, rs []*exprCompiler, errOp, errPosName string) (*assignCompiler, bool)
-func (a *compiler) compileAssign(pos token.Position, lt Type, rs []*exprCompiler, errOp, errPosName string) (func(lv Value, f *Frame))
-func (a *compiler) compileType(b *block, typ ast.Expr) Type
-func (a *compiler) compileTypeDecl(b *block, decl *ast.GenDecl) bool
-func (a *compiler) compileFuncType(b *block, typ *ast.FuncType) *FuncDecl
-
-func (a *compiler) compileArrayLen(b *block, expr ast.Expr) (int64, bool)
-
 
 type label struct {
 	name string;
@@ -64,9 +50,6 @@ type label struct {
 	used token.Position;
 }
 
-type codeBuf struct
-type flowBuf struct
-type FuncType struct
 // A funcCompiler captures information used throughout the compilation
 // of a single function body.
 type funcCompiler struct {
@@ -81,8 +64,6 @@ type funcCompiler struct {
 	err bool;
 }
 
-func (a *funcCompiler) checkLabels()
-
 // A blockCompiler captures information used throughout the compilation
 // of a single block within a function.
 type blockCompiler struct {
@@ -96,11 +77,6 @@ type blockCompiler struct {
 	parent *blockCompiler;
 }
 
-func (a *blockCompiler) compileStmt(s ast.Stmt)
-func (a *blockCompiler) compileStmts(body *ast.BlockStmt)
-func (a *blockCompiler) enterChild() *blockCompiler
-func (a *blockCompiler) exit()
-
 // An exprContext stores information used throughout the compilation
 // of a single expression.  It does not embed funcCompiler because
 // expressions can appear at top level.
diff --git a/usr/austin/eval/decls.go b/usr/austin/eval/decls.go
index c34baed87..44a7e0402 100644
--- a/usr/austin/eval/decls.go
+++ b/usr/austin/eval/decls.go
@@ -13,8 +13,6 @@ import (
  * Types
  */
 
-type Value interface
-
 type Type interface {
 	// compat returns whether this type is compatible with another
 	// type.  If conv is false, this is normal compatibility,
@@ -128,7 +126,6 @@ type PtrValue interface {
 	Set(Value);
 }
 
-type Func interface
 type FuncValue interface {
 	Value;
 	Get() Func;
@@ -158,8 +155,6 @@ type Constant struct {
 	Value Value;
 }
 
-type Scope struct
-
 // A block represents a definition block in which a name may not be
 // defined more than once.
 type block struct {
@@ -192,15 +187,6 @@ type Scope struct {
 	maxVars int;
 }
 
-func (b *block) enterChild() *block
-func (b *block) exit()
-func (b *block) ChildScope() *Scope
-func (b *block) DefineVar(name string, pos token.Position, t Type) (*Variable, Def)
-func (b *block) DefineSlot(t Type) *Variable
-func (b *block) DefineConst(name string, pos token.Position, t Type, v Value) *Constant
-func (b *block) DefineType(name string, pos token.Position, t Type) Type
-func (b *block) Lookup(name string) (level int, def Def)
-
 // The universal scope
 func newUniverse() *Scope {
 	sc := &Scope{nil, 0};
@@ -221,11 +207,6 @@ type Frame struct {
 	Vars []Value;
 }
 
-func (f *Frame) Get(level int, index int) Value
-func (f *Frame) child(numVars int) *Frame
-
-func (s *Scope) NewFrame(outer *Frame) *Frame
-
 /*
  * Functions
  */
diff --git a/usr/austin/eval/expr.go b/usr/austin/eval/expr.go
index 6168dfc41..64243cfc0 100644
--- a/usr/austin/eval/expr.go
+++ b/usr/austin/eval/expr.go
@@ -6,7 +6,6 @@ package eval
 
 import (
 	"bignum";
-	"eval";
 	"go/ast";
 	"go/scanner";
 	"go/token";
@@ -59,35 +58,6 @@ func newExprCompiler(c *exprContext, pos token.Position) *exprCompiler {
 	};
 }
 
-// Operator generators
-// TODO(austin) Remove these forward declarations
-func (a *exprCompiler) genConstant(v Value)
-func (a *exprCompiler) genIdentOp(level int, index int)
-func (a *exprCompiler) genIndexArray(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genFuncCall(call func(f *Frame) []Value)
-func (a *exprCompiler) genValue(vf func(*Frame) Value)
-func (a *exprCompiler) genUnaryOpNeg(v *exprCompiler)
-func (a *exprCompiler) genUnaryOpNot(v *exprCompiler)
-func (a *exprCompiler) genUnaryOpXor(v *exprCompiler)
-func (a *exprCompiler) genBinOpAdd(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpSub(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpMul(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpQuo(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpRem(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpAnd(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpOr(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpXor(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpAndNot(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpShl(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpShr(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpLss(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpGtr(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpLeq(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpGeq(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpEql(l *exprCompiler, r *exprCompiler)
-func (a *exprCompiler) genBinOpNeq(l *exprCompiler, r *exprCompiler)
-func genAssign(lt Type, r *exprCompiler) (func(lv Value, f *Frame))
-
 func (a *exprCompiler) copy() *exprCompiler {
 	ec := newExprCompiler(a.exprContext, a.pos);
 	ec.desc = a.desc;
diff --git a/usr/austin/eval/func.go b/usr/austin/eval/func.go
index 3fc5e71af..2281b644d 100644
--- a/usr/austin/eval/func.go
+++ b/usr/austin/eval/func.go
@@ -4,11 +4,6 @@
 
 package eval
 
-import (
-	"container/vector";
-	"eval";
-)
-
 /*
  * Virtual machine
  */
diff --git a/usr/austin/eval/scope.go b/usr/austin/eval/scope.go
index 3ddc55e48..7ab4f36a2 100644
--- a/usr/austin/eval/scope.go
+++ b/usr/austin/eval/scope.go
@@ -5,7 +5,6 @@
 package eval
 
 import (
-	"eval";
 	"fmt";
 	"go/token";
 	"log";
diff --git a/usr/austin/eval/stmt.go b/usr/austin/eval/stmt.go
index 2b401a1ba..08c0c6d6d 100644
--- a/usr/austin/eval/stmt.go
+++ b/usr/austin/eval/stmt.go
@@ -6,7 +6,6 @@ package eval
 
 import (
 	"bignum";
-	"eval";
 	"log";
 	"os";
 	"go/ast";
@@ -244,8 +243,7 @@ func (a *stmtCompiler) defineVar(ident *ast.Ident, t Type) *Variable {
 	return v;
 }
 
-// TODO(austin) Move the real definition
-func (a *stmtCompiler) doAssign(lhs []ast.Expr, rhs []ast.Expr, tok token.Token, declTypeExpr ast.Expr)
+// TODO(austin) Move doAssign to here
 
 /*
  * Statement visitors
diff --git a/usr/austin/eval/type.go b/usr/austin/eval/type.go
index 0a595e265..ea87287d6 100644
--- a/usr/austin/eval/type.go
+++ b/usr/austin/eval/type.go
@@ -6,7 +6,6 @@ package eval
 
 import (
 	"bignum";
-	"eval";
 	"go/ast";
 	"go/token";
 	"log";
@@ -147,7 +146,10 @@ func (boolType) String() string {
 	return "<bool>";
 }
 
-func (t *boolType) Zero() Value
+func (t *boolType) Zero() Value {
+	res := boolV(false);
+	return &res;
+}
 
 /*
  * Uint
@@ -199,7 +201,31 @@ func (t *uintType) String() string {
 	return "<" + t.name + ">";
 }
 
-func (t *uintType) Zero() Value
+func (t *uintType) Zero() Value {
+	switch t.Bits {
+	case 0:
+		if t.Ptr {
+			res := uintptrV(0);
+			return &res;
+		} else {
+			res := uintV(0);
+			return &res;
+		}
+	case 8:
+		res := uint8V(0);
+		return &res;
+	case 16:
+		res := uint16V(0);
+		return &res;
+	case 32:
+		res := uint32V(0);
+		return &res;
+	case 64:
+		res := uint64V(0);
+		return &res;
+	}
+	panic("unexpected uint bit count: ", t.Bits);
+}
 
 func (t *uintType) minVal() *bignum.Rational {
 	return bignum.Rat(0, 1);
@@ -260,7 +286,27 @@ func (t *intType) String() string {
 	return "<" + t.name + ">";
 }
 
-func (t *intType) Zero() Value
+func (t *intType) Zero() Value {
+	switch t.Bits {
+	case 8:
+		res := int8V(0);
+		return &res;
+	case 16:
+		res := int16V(0);
+		return &res;
+	case 32:
+		res := int32V(0);
+		return &res;
+	case 64:
+		res := int64V(0);
+		return &res;
+
+	case 0:
+		res := intV(0);
+		return &res;
+	}
+	panic("unexpected int bit count: ", t.Bits);
+}
 
 func (t *intType) minVal() *bignum.Rational {
 	bits := t.Bits;
@@ -309,7 +355,9 @@ func (t *idealIntType) String() string {
 	return "ideal integer";
 }
 
-func (t *idealIntType) Zero() Value
+func (t *idealIntType) Zero() Value {
+	return &idealIntV{bignum.Int(0)};
+}
 
 /*
  * Float
@@ -347,7 +395,20 @@ func (t *floatType) String() string {
 	return "<" + t.name + ">";
 }
 
-func (t *floatType) Zero() Value
+func (t *floatType) Zero() Value {
+	switch t.Bits {
+	case 32:
+		res := float32V(0);
+		return &res;
+	case 64:
+		res := float64V(0);
+		return &res;
+	case 0:
+		res := floatV(0);
+		return &res;
+	}
+	panic("unexpected float bit count: ", t.Bits);
+}
 
 var maxFloat32Val = bignum.MakeRat(bignum.Int(0xffffff).Shl(127-23), bignum.Nat(1));
 var maxFloat64Val = bignum.MakeRat(bignum.Int(0x1fffffffffffff).Shl(1023-52), bignum.Nat(1));
@@ -415,7 +476,9 @@ func (t *idealFloatType) String() string {
 	return "ideal float";
 }
 
-func (t *idealFloatType) Zero() Value
+func (t *idealFloatType) Zero() Value {
+	return &idealFloatV{bignum.Rat(1, 0)};
+}
 
 /*
  * String
@@ -440,7 +503,10 @@ func (t *stringType) String() string {
 	return "<string>";
 }
 
-func (t *stringType) Zero() Value
+func (t *stringType) Zero() Value {
+	res := stringV("");
+	return &res;
+}
 
 /*
  * Array
@@ -487,7 +553,18 @@ func (t *ArrayType) String() string {
 	return "[]" + t.Elem.String();
 }
 
-func (t *ArrayType) Zero() Value
+func (t *ArrayType) Zero() Value {
+	res := arrayV(make([]Value, t.Len));
+	// TODO(austin) It's unfortunate that each element is
+	// separately heap allocated.  We could add ZeroArray to
+	// everything, though that doesn't help with multidimensional
+	// arrays.  Or we could do something unsafe.  We'll have this
+	// same problem with structs.
+	for i := int64(0); i < t.Len; i++ {
+		res[i] = t.Elem.Zero();
+	}
+	return &res;
+}
 
 /*
  * Struct
@@ -606,7 +683,13 @@ func (t *StructType) String() string {
 	return s + "}";
 }
 
-func (t *StructType) Zero() Value
+func (t *StructType) Zero() Value {
+	res := structV(make([]Value, len(t.Elems)));
+	for i, f := range t.Elems {
+		res[i] = f.Type.Zero();
+	}
+	return &res;
+}
 
 /*
  * Pointer
@@ -646,7 +729,9 @@ func (t *PtrType) String() string {
 	return "*" + t.Elem.String();
 }
 
-func (t *PtrType) Zero() Value
+func (t *PtrType) Zero() Value {
+	return &ptrV{nil};
+}
 
 /*
  * Function
@@ -749,7 +834,9 @@ func (t *FuncType) String() string {
 	return s;
 }
 
-func (t *FuncType) Zero() Value
+func (t *FuncType) Zero() Value {
+	return &funcV{nil};
+}
 
 type FuncDecl struct {
 	Type *FuncType;
@@ -919,4 +1006,10 @@ func (t *MultiType) String() string {
 	return typeListString(t.Elems, nil);
 }
 
-func (t *MultiType) Zero() Value
+func (t *MultiType) Zero() Value {
+	res := make([]Value, len(t.Elems));
+	for i, t := range t.Elems {
+		res[i] = t.Zero();
+	}
+	return multiV(res);
+}
diff --git a/usr/austin/eval/typec.go b/usr/austin/eval/typec.go
index 1457ddbd3..32461833c 100644
--- a/usr/austin/eval/typec.go
+++ b/usr/austin/eval/typec.go
@@ -5,7 +5,6 @@
 package eval
 
 import (
-	"eval";
 	"go/ast";
 	"go/token";
 	"log";
@@ -16,12 +15,6 @@ import (
  * Type compiler
  */
 
-// TODO(austin) Without this, I get a "conflicting definitions for
-// eval.compiler" when gopack'ing typec.6 from gobuild.
-// Interestingly, if I create the Makefile with this line, then
-// comment it out and use the Makefile, things work.
-type exprCompiler struct
-
 type typeCompiler struct {
 	*compiler;
 	block *block;
@@ -32,8 +25,6 @@ type typeCompiler struct {
 	lateCheck func() bool
 }
 
-func (a *typeCompiler) compileType(x ast.Expr, allowRec bool) Type
-
 func (a *typeCompiler) compileIdent(x *ast.Ident, allowRec bool) Type {
 	_, def := a.block.Lookup(x.Value);
 	if def == nil {
diff --git a/usr/austin/eval/util.go b/usr/austin/eval/util.go
index e08c8ee5a..68f58842d 100644
--- a/usr/austin/eval/util.go
+++ b/usr/austin/eval/util.go
@@ -6,7 +6,6 @@ package eval
 
 import (
 	"bignum";
-	"eval";
 	"fmt";
 	"go/token";
 )
diff --git a/usr/austin/eval/value.go b/usr/austin/eval/value.go
index b3fd13876..79c0a0e3e 100644
--- a/usr/austin/eval/value.go
+++ b/usr/austin/eval/value.go
@@ -6,7 +6,6 @@ package eval
 
 import (
 	"bignum";
-	"eval";
 	"fmt";
 )
 
@@ -32,11 +31,6 @@ func (v *boolV) Set(x bool) {
 	*v = boolV(x);
 }
 
-func (t *boolType) Zero() Value {
-	res := boolV(false);
-	return &res;
-}
-
 /*
  * Uint
  */
@@ -149,32 +143,6 @@ func (v *uintptrV) Set(x uint64) {
 	*v = uintptrV(x);
 }
 
-func (t *uintType) Zero() Value {
-	switch t.Bits {
-	case 0:
-		if t.Ptr {
-			res := uintptrV(0);
-			return &res;
-		} else {
-			res := uintV(0);
-			return &res;
-		}
-	case 8:
-		res := uint8V(0);
-		return &res;
-	case 16:
-		res := uint16V(0);
-		return &res;
-	case 32:
-		res := uint32V(0);
-		return &res;
-	case 64:
-		res := uint64V(0);
-		return &res;
-	}
-	panic("unexpected uint bit count: ", t.Bits);
-}
-
 /*
  * Int
  */
@@ -269,28 +237,6 @@ func (v *intV) Set(x int64) {
 	*v = intV(x);
 }
 
-func (t *intType) Zero() Value {
-	switch t.Bits {
-	case 8:
-		res := int8V(0);
-		return &res;
-	case 16:
-		res := int16V(0);
-		return &res;
-	case 32:
-		res := int32V(0);
-		return &res;
-	case 64:
-		res := int64V(0);
-		return &res;
-
-	case 0:
-		res := intV(0);
-		return &res;
-	}
-	panic("unexpected int bit count: ", t.Bits);
-}
-
 /*
  * Ideal int
  */
@@ -311,10 +257,6 @@ func (v *idealIntV) Get() *bignum.Integer {
 	return v.V;
 }
 
-func (t *idealIntType) Zero() Value {
-	return &idealIntV{bignum.Int(0)};
-}
-
 /*
  * Float
  */
@@ -373,21 +315,6 @@ func (v *floatV) Set(x float64) {
 	*v = floatV(x);
 }
 
-func (t *floatType) Zero() Value {
-	switch t.Bits {
-	case 32:
-		res := float32V(0);
-		return &res;
-	case 64:
-		res := float64V(0);
-		return &res;
-	case 0:
-		res := floatV(0);
-		return &res;
-	}
-	panic("unexpected float bit count: ", t.Bits);
-}
-
 /*
  * Ideal float
  */
@@ -408,10 +335,6 @@ func (v *idealFloatV) Get() *bignum.Rational {
 	return v.V;
 }
 
-func (t *idealFloatType) Zero() Value {
-	return &idealFloatV{bignum.Rat(1, 0)};
-}
-
 /*
  * String
  */
@@ -434,11 +357,6 @@ func (v *stringV) Set(x string) {
 	*v = stringV(x);
 }
 
-func (t *stringType) Zero() Value {
-	res := stringV("");
-	return &res;
-}
-
 /*
  * Array
  */
@@ -465,19 +383,6 @@ func (v *arrayV) Elem(i int64) Value {
 	return (*v)[i];
 }
 
-func (t *ArrayType) Zero() Value {
-	res := arrayV(make([]Value, t.Len));
-	// TODO(austin) It's unfortunate that each element is
-	// separately heap allocated.  We could add ZeroArray to
-	// everything, though that doesn't help with multidimensional
-	// arrays.  Or we could do something unsafe.  We'll have this
-	// same problem with structs.
-	for i := int64(0); i < t.Len; i++ {
-		res[i] = t.Elem.Zero();
-	}
-	return &res;
-}
-
 /*
  * Struct
  */
@@ -513,14 +418,6 @@ func (v *structV) Field(i int) Value {
 	return (*v)[i];
 }
 
-func (t *StructType) Zero() Value {
-	res := structV(make([]Value, len(t.Elems)));
-	for i, f := range t.Elems {
-		res[i] = f.Type.Zero();
-	}
-	return &res;
-}
-
 /*
  * Pointer
  */
@@ -546,10 +443,6 @@ func (v *ptrV) Set(x Value) {
 	v.target = x;
 }
 
-func (t *PtrType) Zero() Value {
-	return &ptrV{nil};
-}
-
 /*
  * Functions
  */
@@ -575,10 +468,6 @@ func (v *funcV) Set(x Func) {
 	v.target = x;
 }
 
-func (t *FuncType) Zero() Value {
-	return &funcV{nil};
-}
-
 /*
  * Multi-values
  */
@@ -603,14 +492,6 @@ func (v multiV) Assign(o Value) {
 	}
 }
 
-func (t *MultiType) Zero() Value {
-	res := make([]Value, len(t.Elems));
-	for i, t := range t.Elems {
-		res[i] = t.Zero();
-	}
-	return multiV(res);
-}
-
 /*
  * Universal constants
  */