1 files changed, 431 insertions, 0 deletions
diff --git a/vendor/golang.org/x/tools/go/ssa/print.go b/vendor/golang.org/x/tools/go/ssa/print.go
new file mode 100644
index 0000000..3333ba4
--- /dev/null
+++ b/vendor/golang.org/x/tools/go/ssa/print.go
@@ -0,0 +1,431 @@
+// Copyright 2013 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
+
+// This file implements the String() methods for all Value and
+// Instruction types.
+
+import (
+	"bytes"
+	"fmt"
+	"go/types"
+	"io"
+	"reflect"
+	"sort"
+
+	"golang.org/x/tools/go/types/typeutil"
+)
+
+// relName returns the name of v relative to i.
+// In most cases, this is identical to v.Name(), but references to
+// Functions (including methods) and Globals use RelString and
+// all types are displayed with relType, so that only cross-package
+// references are package-qualified.
+//
+func relName(v Value, i Instruction) string {
+	var from *types.Package
+	if i != nil {
+		from = i.Parent().pkg()
+	}
+	switch v := v.(type) {
+	case Member: // *Function or *Global
+		return v.RelString(from)
+	case *Const:
+		return v.RelString(from)
+	}
+	return v.Name()
+}
+
+func relType(t types.Type, from *types.Package) string {
+	return types.TypeString(t, types.RelativeTo(from))
+}
+
+func relString(m Member, from *types.Package) string {
+	// NB: not all globals have an Object (e.g. init$guard),
+	// so use Package().Object not Object.Package().
+	if pkg := m.Package().Pkg; pkg != nil && pkg != from {
+		return fmt.Sprintf("%s.%s", pkg.Path(), m.Name())
+	}
+	return m.Name()
+}
+
+// Value.String()
+//
+// This method is provided only for debugging.
+// It never appears in disassembly, which uses Value.Name().
+
+func (v *Parameter) String() string {
+	from := v.Parent().pkg()
+	return fmt.Sprintf("parameter %s : %s", v.Name(), relType(v.Type(), from))
+}
+
+func (v *FreeVar) String() string {
+	from := v.Parent().pkg()
+	return fmt.Sprintf("freevar %s : %s", v.Name(), relType(v.Type(), from))
+}
+
+func (v *Builtin) String() string {
+	return fmt.Sprintf("builtin %s", v.Name())
+}
+
+// Instruction.String()
+
+func (v *Alloc) String() string {
+	op := "local"
+	if v.Heap {
+		op = "new"
+	}
+	from := v.Parent().pkg()
+	return fmt.Sprintf("%s %s (%s)", op, relType(deref(v.Type()), from), v.Comment)
+}
+
+func (v *Phi) String() string {
+	var b bytes.Buffer
+	b.WriteString("phi [")
+	for i, edge := range v.Edges {
+		if i > 0 {
+			b.WriteString(", ")
+		}
+		// Be robust against malformed CFG.
+		if v.block == nil {
+			b.WriteString("??")
+			continue
+		}
+		block := -1
+		if i < len(v.block.Preds) {
+			block = v.block.Preds[i].Index
+		}
+		fmt.Fprintf(&b, "%d: ", block)
+		edgeVal := "<nil>" // be robust
+		if edge != nil {
+			edgeVal = relName(edge, v)
+		}
+		b.WriteString(edgeVal)
+	}
+	b.WriteString("]")
+	if v.Comment != "" {
+		b.WriteString(" #")
+		b.WriteString(v.Comment)
+	}
+	return b.String()
+}
+
+func printCall(v *CallCommon, prefix string, instr Instruction) string {
+	var b bytes.Buffer
+	b.WriteString(prefix)
+	if !v.IsInvoke() {
+		b.WriteString(relName(v.Value, instr))
+	} else {
+		fmt.Fprintf(&b, "invoke %s.%s", relName(v.Value, instr), v.Method.Name())
+	}
+	b.WriteString("(")
+	for i, arg := range v.Args {
+		if i > 0 {
+			b.WriteString(", ")
+		}
+		b.WriteString(relName(arg, instr))
+	}
+	if v.Signature().Variadic() {
+		b.WriteString("...")
+	}
+	b.WriteString(")")
+	return b.String()
+}
+
+func (c *CallCommon) String() string {
+	return printCall(c, "", nil)
+}
+
+func (v *Call) String() string {
+	return printCall(&v.Call, "", v)
+}
+
+func (v *BinOp) String() string {
+	return fmt.Sprintf("%s %s %s", relName(v.X, v), v.Op.String(), relName(v.Y, v))
+}
+
+func (v *UnOp) String() string {
+	return fmt.Sprintf("%s%s%s", v.Op, relName(v.X, v), commaOk(v.CommaOk))
+}
+
+func printConv(prefix string, v, x Value) string {
+	from := v.Parent().pkg()
+	return fmt.Sprintf("%s %s <- %s (%s)",
+		prefix,
+		relType(v.Type(), from),
+		relType(x.Type(), from),
+		relName(x, v.(Instruction)))
+}
+
+func (v *ChangeType) String() string      { return printConv("changetype", v, v.X) }
+func (v *Convert) String() string         { return printConv("convert", v, v.X) }
+func (v *ChangeInterface) String() string { return printConv("change interface", v, v.X) }
+func (v *MakeInterface) String() string   { return printConv("make", v, v.X) }
+
+func (v *MakeClosure) String() string {
+	var b bytes.Buffer
+	fmt.Fprintf(&b, "make closure %s", relName(v.Fn, v))
+	if v.Bindings != nil {
+		b.WriteString(" [")
+		for i, c := range v.Bindings {
+			if i > 0 {
+				b.WriteString(", ")
+			}
+			b.WriteString(relName(c, v))
+		}
+		b.WriteString("]")
+	}
+	return b.String()
+}
+
+func (v *MakeSlice) String() string {
+	from := v.Parent().pkg()
+	return fmt.Sprintf("make %s %s %s",
+		relType(v.Type(), from),
+		relName(v.Len, v),
+		relName(v.Cap, v))
+}
+
+func (v *Slice) String() string {
+	var b bytes.Buffer
+	b.WriteString("slice ")
+	b.WriteString(relName(v.X, v))
+	b.WriteString("[")
+	if v.Low != nil {
+		b.WriteString(relName(v.Low, v))
+	}
+	b.WriteString(":")
+	if v.High != nil {
+		b.WriteString(relName(v.High, v))
+	}
+	if v.Max != nil {
+		b.WriteString(":")
+		b.WriteString(relName(v.Max, v))
+	}
+	b.WriteString("]")
+	return b.String()
+}
+
+func (v *MakeMap) String() string {
+	res := ""
+	if v.Reserve != nil {
+		res = relName(v.Reserve, v)
+	}
+	from := v.Parent().pkg()
+	return fmt.Sprintf("make %s %s", relType(v.Type(), from), res)
+}
+
+func (v *MakeChan) String() string {
+	from := v.Parent().pkg()
+	return fmt.Sprintf("make %s %s", relType(v.Type(), from), relName(v.Size, v))
+}
+
+func (v *FieldAddr) String() string {
+	st := deref(v.X.Type()).Underlying().(*types.Struct)
+	// Be robust against a bad index.
+	name := "?"
+	if 0 <= v.Field && v.Field < st.NumFields() {
+		name = st.Field(v.Field).Name()
+	}
+	return fmt.Sprintf("&%s.%s [#%d]", relName(v.X, v), name, v.Field)
+}
+
+func (v *Field) String() string {
+	st := v.X.Type().Underlying().(*types.Struct)
+	// Be robust against a bad index.
+	name := "?"
+	if 0 <= v.Field && v.Field < st.NumFields() {
+		name = st.Field(v.Field).Name()
+	}
+	return fmt.Sprintf("%s.%s [#%d]", relName(v.X, v), name, v.Field)
+}
+
+func (v *IndexAddr) String() string {
+	return fmt.Sprintf("&%s[%s]", relName(v.X, v), relName(v.Index, v))
+}
+
+func (v *Index) String() string {
+	return fmt.Sprintf("%s[%s]", relName(v.X, v), relName(v.Index, v))
+}
+
+func (v *Lookup) String() string {
+	return fmt.Sprintf("%s[%s]%s", relName(v.X, v), relName(v.Index, v), commaOk(v.CommaOk))
+}
+
+func (v *Range) String() string {
+	return "range " + relName(v.X, v)
+}
+
+func (v *Next) String() string {
+	return "next " + relName(v.Iter, v)
+}
+
+func (v *TypeAssert) String() string {
+	from := v.Parent().pkg()
+	return fmt.Sprintf("typeassert%s %s.(%s)", commaOk(v.CommaOk), relName(v.X, v), relType(v.AssertedType, from))
+}
+
+func (v *Extract) String() string {
+	return fmt.Sprintf("extract %s #%d", relName(v.Tuple, v), v.Index)
+}
+
+func (s *Jump) String() string {
+	// Be robust against malformed CFG.
+	block := -1
+	if s.block != nil && len(s.block.Succs) == 1 {
+		block = s.block.Succs[0].Index
+	}
+	return fmt.Sprintf("jump %d", block)
+}
+
+func (s *If) String() string {
+	// Be robust against malformed CFG.
+	tblock, fblock := -1, -1
+	if s.block != nil && len(s.block.Succs) == 2 {
+		tblock = s.block.Succs[0].Index
+		fblock = s.block.Succs[1].Index
+	}
+	return fmt.Sprintf("if %s goto %d else %d", relName(s.Cond, s), tblock, fblock)
+}
+
+func (s *Go) String() string {
+	return printCall(&s.Call, "go ", s)
+}
+
+func (s *Panic) String() string {
+	return "panic " + relName(s.X, s)
+}
+
+func (s *Return) String() string {
+	var b bytes.Buffer
+	b.WriteString("return")
+	for i, r := range s.Results {
+		if i == 0 {
+			b.WriteString(" ")
+		} else {
+			b.WriteString(", ")
+		}
+		b.WriteString(relName(r, s))
+	}
+	return b.String()
+}
+
+func (*RunDefers) String() string {
+	return "rundefers"
+}
+
+func (s *Send) String() string {
+	return fmt.Sprintf("send %s <- %s", relName(s.Chan, s), relName(s.X, s))
+}
+
+func (s *Defer) String() string {
+	return printCall(&s.Call, "defer ", s)
+}
+
+func (s *Select) String() string {
+	var b bytes.Buffer
+	for i, st := range s.States {
+		if i > 0 {
+			b.WriteString(", ")
+		}
+		if st.Dir == types.RecvOnly {
+			b.WriteString("<-")
+			b.WriteString(relName(st.Chan, s))
+		} else {
+			b.WriteString(relName(st.Chan, s))
+			b.WriteString("<-")
+			b.WriteString(relName(st.Send, s))
+		}
+	}
+	non := ""
+	if !s.Blocking {
+		non = "non"
+	}
+	return fmt.Sprintf("select %sblocking [%s]", non, b.String())
+}
+
+func (s *Store) String() string {
+	return fmt.Sprintf("*%s = %s", relName(s.Addr, s), relName(s.Val, s))
+}
+
+func (s *MapUpdate) String() string {
+	return fmt.Sprintf("%s[%s] = %s", relName(s.Map, s), relName(s.Key, s), relName(s.Value, s))
+}
+
+func (s *DebugRef) String() string {
+	p := s.Parent().Prog.Fset.Position(s.Pos())
+	var descr interface{}
+	if s.object != nil {
+		descr = s.object // e.g. "var x int"
+	} else {
+		descr = reflect.TypeOf(s.Expr) // e.g. "*ast.CallExpr"
+	}
+	var addr string
+	if s.IsAddr {
+		addr = "address of "
+	}
+	return fmt.Sprintf("; %s%s @ %d:%d is %s", addr, descr, p.Line, p.Column, s.X.Name())
+}
+
+func (p *Package) String() string {
+	return "package " + p.Pkg.Path()
+}
+
+var _ io.WriterTo = (*Package)(nil) // *Package implements io.Writer
+
+func (p *Package) WriteTo(w io.Writer) (int64, error) {
+	var buf bytes.Buffer
+	WritePackage(&buf, p)
+	n, err := w.Write(buf.Bytes())
+	return int64(n), err
+}
+
+// WritePackage writes to buf a human-readable summary of p.
+func WritePackage(buf *bytes.Buffer, p *Package) {
+	fmt.Fprintf(buf, "%s:\n", p)
+
+	var names []string
+	maxname := 0
+	for name := range p.Members {
+		if l := len(name); l > maxname {
+			maxname = l
+		}
+		names = append(names, name)
+	}
+
+	from := p.Pkg
+	sort.Strings(names)
+	for _, name := range names {
+		switch mem := p.Members[name].(type) {
+		case *NamedConst:
+			fmt.Fprintf(buf, "  const %-*s %s = %s\n",
+				maxname, name, mem.Name(), mem.Value.RelString(from))
+
+		case *Function:
+			fmt.Fprintf(buf, "  func  %-*s %s\n",
+				maxname, name, relType(mem.Type(), from))
+
+		case *Type:
+			fmt.Fprintf(buf, "  type  %-*s %s\n",
+				maxname, name, relType(mem.Type().Underlying(), from))
+			for _, meth := range typeutil.IntuitiveMethodSet(mem.Type(), &p.Prog.MethodSets) {
+				fmt.Fprintf(buf, "    %s\n", types.SelectionString(meth, types.RelativeTo(from)))
+			}
+
+		case *Global:
+			fmt.Fprintf(buf, "  var   %-*s %s\n",
+				maxname, name, relType(mem.Type().(*types.Pointer).Elem(), from))
+		}
+	}
+
+	fmt.Fprintf(buf, "\n")
+}
+
+func commaOk(x bool) string {
+	if x {
+		return ",ok"
+	}
+	return ""
+}