[dev.inline] cmd/compile: introduce cmd/internal/src.Pos type for line numbers

This is a step toward chosing a different position representation.
By introducing an explicit type, it will be easier to make the
transition step-wise while ensuring everything keeps running.

This has been reviewed via https://go-review.googlesource.com/#/c/34025/.

Change-Id: Ibceddcd62d8f346321ac3250e3940e9c436ed684
Reviewed-on: https://go-review.googlesource.com/34132
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Lazar <lazard@golang.org>

src/cmd/compile/fmt_test.go

@@ -654,6 +654,7 @@ var knownFormats = map[string]string{
 	"cmd/compile/internal/syntax.token %q":            "",
 	"cmd/compile/internal/syntax.token %s":            "",
 	"cmd/internal/obj.As %v":                          "",
+	"cmd/internal/src.Pos %d":                         "",
 	"error %v":                                        "",
 	"float64 %.2f":                                    "",
 	"float64 %.3f":                                    "",

src/cmd/compile/internal/gc/const.go

@@ -4,7 +4,10 @@
 
 package gc
 
-import "strings"
+import (
+	"cmd/internal/src"
+	"strings"
+)
 
 // Ctype describes the constant kind of an "ideal" (untyped) constant.
 type Ctype int8
@@ -676,7 +679,7 @@ func evconst(n *Node) {
 
 	nr := n.Right
 	var rv Val
-	var lno int32
+	var lno src.Pos
 	var wr EType
 	var v Val
 	var norig *Node

src/cmd/compile/internal/gc/dcl.go

@@ -6,6 +6,7 @@ package gc
 
 import (
 	"cmd/internal/obj"
+	"cmd/internal/src"
 	"fmt"
 	"sort"
 	"strings"
@@ -287,7 +288,7 @@ func variter(vl []*Node, t *Node, el []*Node) []*Node {
 // declare constants from grammar
 // new_name_list [[type] = expr_list]
 func constiter(vl []*Node, t *Node, cl []*Node) []*Node {
-	lno := int32(0) // default is to leave line number alone in listtreecopy
+	lno := src.Pos(0) // default is to leave line number alone in listtreecopy
 	if len(cl) == 0 {
 		if t != nil {
 			yyerror("const declaration cannot have type without expression")
@@ -1344,7 +1345,7 @@ type nowritebarrierrecChecker struct {
 type nowritebarrierrecCall struct {
 	target *Node
 	depth  int
-	lineno int32
+	lineno src.Pos
 }
 
 func checknowritebarrierrec() {

src/cmd/compile/internal/gc/go.go

@@ -8,6 +8,7 @@ import (
 	"cmd/compile/internal/ssa"
 	"cmd/internal/bio"
 	"cmd/internal/obj"
+	"cmd/internal/src"
 )
 
 const (
@@ -42,10 +43,10 @@ type Sym struct {
 
 	// saved and restored by dcopy
 	Pkg        *Pkg
-	Name       string // object name
-	Def        *Node  // definition: ONAME OTYPE OPACK or OLITERAL
-	Block      int32  // blocknumber to catch redeclaration
-	Lastlineno int32  // last declaration for diagnostic
+	Name       string  // object name
+	Def        *Node   // definition: ONAME OTYPE OPACK or OLITERAL
+	Block      int32   // blocknumber to catch redeclaration
+	Lastlineno src.Pos // last declaration for diagnostic
 
 	Label   *Node // corresponding label (ephemeral)
 	Origpkg *Pkg  // original package for . import

src/cmd/compile/internal/gc/gsubr.go

@@ -45,7 +45,7 @@ func Prog(as obj.As) *obj.Prog {
 	}
 
 	p.As = as
-	p.Lineno = lineno
+	p.Lineno = int32(lineno) // TODO(gri) fix this
 	return p
 }
 

src/cmd/compile/internal/gc/inl.go

@@ -27,7 +27,10 @@
 
 package gc
 
-import "fmt"
+import (
+	"cmd/internal/src"
+	"fmt"
+)
 
 // Get the function's package. For ordinary functions it's on the ->sym, but for imported methods
 // the ->sym can be re-used in the local package, so peel it off the receiver's type.
@@ -1014,13 +1017,13 @@ func (subst *inlsubst) node(n *Node) *Node {
 }
 
 // Plaster over linenumbers
-func setlnolist(ll Nodes, lno int32) {
+func setlnolist(ll Nodes, lno src.Pos) {
 	for _, n := range ll.Slice() {
 		setlno(n, lno)
 	}
 }
 
-func setlno(n *Node, lno int32) {
+func setlno(n *Node, lno src.Pos) {
 	if n == nil {
 		return
 	}

src/cmd/compile/internal/gc/lex.go

@@ -7,16 +7,17 @@ package gc
 import (
 	"cmd/compile/internal/syntax"
 	"cmd/internal/obj"
+	"cmd/internal/src"
 	"fmt"
 	"strings"
 )
 
 // lexlineno is the line number _after_ the most recently read rune.
 // In particular, it's advanced (or rewound) as newlines are read (or unread).
-var lexlineno int32
+var lexlineno src.Pos
 
 // lineno is the line number at the start of the most recently lexed token.
-var lineno int32
+var lineno src.Pos
 
 func isSpace(c rune) bool {
 	return c == ' ' || c == '\t' || c == '\n' || c == '\r'

src/cmd/compile/internal/gc/main.go

@@ -11,6 +11,7 @@ import (
 	"bytes"
 	"cmd/compile/internal/ssa"
 	"cmd/internal/obj"
+	"cmd/internal/src"
 	"cmd/internal/sys"
 	"flag"
 	"fmt"
@@ -878,7 +879,7 @@ func importfile(f *Val, indent []byte) {
 	}
 }
 
-func pkgnotused(lineno int32, path string, name string) {
+func pkgnotused(lineno src.Pos, path string, name string) {
 	// If the package was imported with a name other than the final
 	// import path element, show it explicitly in the error message.
 	// Note that this handles both renamed imports and imports of

src/cmd/compile/internal/gc/noder.go

@@ -5,13 +5,13 @@
 package gc
 
 import (
+	"cmd/compile/internal/syntax"
+	"cmd/internal/src"
 	"fmt"
 	"os"
 	"strconv"
 	"strings"
 	"unicode/utf8"
-
-	"cmd/compile/internal/syntax"
 )
 
 func parseFile(filename string) {
@@ -40,7 +40,7 @@ func parseFile(filename string) {
 
 // noder transforms package syntax's AST into a Nod tree.
 type noder struct {
-	baseline  int32
+	baseline  src.Pos
 	linknames []int // tracks //go:linkname lines
 }
 
@@ -50,7 +50,7 @@ func (p *noder) file(file *syntax.File) {
 
 	xtop = append(xtop, p.decls(file.DeclList)...)
 
-	lexlineno = p.baseline + int32(file.Lines) - 1
+	lexlineno = p.baseline + src.Pos(file.Lines) - 1
 	lineno = lexlineno
 }
 
@@ -231,7 +231,7 @@ func (p *noder) funcDecl(fun *syntax.FuncDecl) *Node {
 		yyerror("can only use //go:noescape with external func implementations")
 	}
 	f.Func.Pragma = pragma
-	lineno = p.baseline + int32(fun.EndLine) - 1
+	lineno = p.baseline + src.Pos(fun.EndLine) - 1
 	f.Func.Endlineno = lineno
 
 	funcbody(f)
@@ -357,14 +357,14 @@ func (p *noder) expr(expr syntax.Expr) *Node {
 			l[i] = p.wrapname(expr.ElemList[i], e)
 		}
 		n.List.Set(l)
-		lineno = p.baseline + int32(expr.EndLine) - 1
+		lineno = p.baseline + src.Pos(expr.EndLine) - 1
 		return n
 	case *syntax.KeyValueExpr:
 		return p.nod(expr, OKEY, p.expr(expr.Key), p.wrapname(expr.Value, p.expr(expr.Value)))
 	case *syntax.FuncLit:
 		closurehdr(p.typeExpr(expr.Type))
 		body := p.stmts(expr.Body)
-		lineno = p.baseline + int32(expr.EndLine) - 1
+		lineno = p.baseline + src.Pos(expr.EndLine) - 1
 		return p.setlineno(expr, closurebody(body))
 	case *syntax.ParenExpr:
 		return p.nod(expr, OPAREN, p.expr(expr.X), nil)
@@ -985,8 +985,8 @@ func (p *noder) nod(orig syntax.Node, op Op, left, right *Node) *Node {
 	return p.setlineno(orig, nod(op, left, right))
 }
 
-func (p *noder) setlineno(src syntax.Node, dst *Node) *Node {
-	l := int32(src.Line())
+func (p *noder) setlineno(src_ syntax.Node, dst *Node) *Node {
+	l := src.Pos(src_.Line())
 	if l == 0 {
 		// TODO(mdempsky): Shouldn't happen. Fix package syntax.
 		return dst
@@ -999,7 +999,7 @@ func (p *noder) lineno(n syntax.Node) {
 	if n == nil {
 		return
 	}
-	l := int32(n.Line())
+	l := src.Pos(n.Line())
 	if l == 0 {
 		// TODO(mdempsky): Shouldn't happen. Fix package syntax.
 		return
@@ -1011,7 +1011,7 @@ func (p *noder) error(err error) {
 	line := p.baseline
 	var msg string
 	if err, ok := err.(syntax.Error); ok {
-		line += int32(err.Line) - 1
+		line += src.Pos(err.Line) - 1
 		msg = err.Msg
 	} else {
 		msg = err.Error()
@@ -1039,7 +1039,7 @@ func (p *noder) pragma(pos, line int, text string) syntax.Pragma {
 		if n <= 0 {
 			break
 		}
-		lexlineno = p.baseline + int32(line)
+		lexlineno = p.baseline + src.Pos(line)
 		linehistupdate(text[5:i], n)
 
 	case strings.HasPrefix(text, "go:linkname "):

src/cmd/compile/internal/gc/pgen.go

@@ -7,6 +7,7 @@ package gc
 import (
 	"cmd/compile/internal/ssa"
 	"cmd/internal/obj"
+	"cmd/internal/src"
 	"cmd/internal/sys"
 	"fmt"
 	"sort"
@@ -311,7 +312,7 @@ func compile(fn *Node) {
 		assertI2I2 = Sysfunc("assertI2I2")
 	}
 
-	defer func(lno int32) {
+	defer func(lno src.Pos) {
 		lineno = lno
 	}(setlineno(fn))
 

src/cmd/compile/internal/gc/phi.go

@@ -6,6 +6,7 @@ package gc
 
 import (
 	"cmd/compile/internal/ssa"
+	"cmd/internal/src"
 	"container/heap"
 	"fmt"
 )
@@ -499,7 +500,7 @@ loop:
 }
 
 // lookupVarOutgoing finds the variable's value at the end of block b.
-func (s *simplePhiState) lookupVarOutgoing(b *ssa.Block, t ssa.Type, var_ *Node, line int32) *ssa.Value {
+func (s *simplePhiState) lookupVarOutgoing(b *ssa.Block, t ssa.Type, var_ *Node, line src.Pos) *ssa.Value {
 	for {
 		if v := s.defvars[b.ID][var_]; v != nil {
 			return v

src/cmd/compile/internal/gc/plive.go

@@ -17,6 +17,7 @@ package gc
 
 import (
 	"cmd/internal/obj"
+	"cmd/internal/src"
 	"cmd/internal/sys"
 	"crypto/md5"
 	"fmt"
@@ -1253,7 +1254,7 @@ func livenessepilogue(lv *Liveness) {
 						if !n.Name.Needzero {
 							n.Name.Needzero = true
 							if debuglive >= 1 {
-								Warnl(p.Lineno, "%v: %L is ambiguously live", Curfn.Func.Nname, n)
+								Warnl(src.Pos(p.Lineno), "%v: %L is ambiguously live", Curfn.Func.Nname, n)
 							}
 						}
 					}
@@ -1344,7 +1345,7 @@ func livenessepilogue(lv *Liveness) {
 						}
 						n := lv.vars[j]
 						if n.Class != PPARAM {
-							yyerrorl(p.Lineno, "internal error: %v %L recorded as live on entry, p.Pc=%v", Curfn.Func.Nname, n, p.Pc)
+							yyerrorl(src.Pos(p.Lineno), "internal error: %v %L recorded as live on entry, p.Pc=%v", Curfn.Func.Nname, n, p.Pc)
 						}
 					}
 				}

src/cmd/compile/internal/gc/ssa.go

@@ -14,6 +14,7 @@ import (
 
 	"cmd/compile/internal/ssa"
 	"cmd/internal/obj"
+	"cmd/internal/src"
 	"cmd/internal/sys"
 )
 
@@ -228,7 +229,7 @@ type state struct {
 	sb       *ssa.Value
 
 	// line number stack. The current line number is top of stack
-	line []int32
+	line []src.Pos
 
 	// list of panic calls by function name and line number.
 	// Used to deduplicate panic calls.
@@ -242,12 +243,12 @@ type state struct {
 
 	cgoUnsafeArgs bool
 	noWB          bool
-	WBLineno      int32 // line number of first write barrier. 0=no write barriers
+	WBLineno      src.Pos // line number of first write barrier. 0=no write barriers
 }
 
 type funcLine struct {
 	f    *Node
-	line int32
+	line src.Pos
 }
 
 type ssaLabel struct {
@@ -278,11 +279,13 @@ func (s *state) label(sym *Sym) *ssaLabel {
 	return lab
 }
 
-func (s *state) Logf(msg string, args ...interface{})              { s.config.Logf(msg, args...) }
-func (s *state) Log() bool                                         { return s.config.Log() }
-func (s *state) Fatalf(msg string, args ...interface{})            { s.config.Fatalf(s.peekLine(), msg, args...) }
-func (s *state) Warnl(line int32, msg string, args ...interface{}) { s.config.Warnl(line, msg, args...) }
-func (s *state) Debug_checknil() bool                              { return s.config.Debug_checknil() }
+func (s *state) Logf(msg string, args ...interface{})   { s.config.Logf(msg, args...) }
+func (s *state) Log() bool                              { return s.config.Log() }
+func (s *state) Fatalf(msg string, args ...interface{}) { s.config.Fatalf(s.peekLine(), msg, args...) }
+func (s *state) Warnl(line src.Pos, msg string, args ...interface{}) {
+	s.config.Warnl(line, msg, args...)
+}
+func (s *state) Debug_checknil() bool { return s.config.Debug_checknil() }
 
 var (
 	// dummy node for the memory variable
@@ -328,7 +331,7 @@ func (s *state) endBlock() *ssa.Block {
 }
 
 // pushLine pushes a line number on the line number stack.
-func (s *state) pushLine(line int32) {
+func (s *state) pushLine(line src.Pos) {
 	if line == 0 {
 		// the frontend may emit node with line number missing,
 		// use the parent line number in this case.
@@ -346,7 +349,7 @@ func (s *state) popLine() {
 }
 
 // peekLine peek the top of the line number stack.
-func (s *state) peekLine() int32 {
+func (s *state) peekLine() src.Pos {
 	return s.line[len(s.line)-1]
 }
 
@@ -2358,7 +2361,7 @@ const (
 // If deref is true, rightIsVolatile reports whether right points to volatile (clobbered by a call) storage.
 // Include a write barrier if wb is true.
 // skip indicates assignments (at the top level) that can be avoided.
-func (s *state) assign(left *Node, right *ssa.Value, wb, deref bool, line int32, skip skipMask, rightIsVolatile bool) {
+func (s *state) assign(left *Node, right *ssa.Value, wb, deref bool, line src.Pos, skip skipMask, rightIsVolatile bool) {
 	if left.Op == ONAME && isblank(left) {
 		return
 	}
@@ -3257,7 +3260,7 @@ func canSSAType(t *Type) bool {
 }
 
 // exprPtr evaluates n to a pointer and nil-checks it.
-func (s *state) exprPtr(n *Node, bounded bool, lineno int32) *ssa.Value {
+func (s *state) exprPtr(n *Node, bounded bool, lineno src.Pos) *ssa.Value {
 	p := s.expr(n)
 	if bounded || n.NonNil {
 		if s.f.Config.Debug_checknil() && lineno > 1 {
@@ -3405,7 +3408,7 @@ func (s *state) rtcall(fn *Node, returns bool, results []*Type, args ...*ssa.Val
 // insertWBmove inserts the assignment *left = *right including a write barrier.
 // t is the type being assigned.
 // If right == nil, then we're zeroing *left.
-func (s *state) insertWBmove(t *Type, left, right *ssa.Value, line int32, rightIsVolatile bool) {
+func (s *state) insertWBmove(t *Type, left, right *ssa.Value, line src.Pos, rightIsVolatile bool) {
 	// if writeBarrier.enabled {
 	//   typedmemmove(&t, left, right)
 	// } else {
@@ -3453,7 +3456,7 @@ func (s *state) insertWBmove(t *Type, left, right *ssa.Value, line int32, rightI
 
 // insertWBstore inserts the assignment *left = right including a write barrier.
 // t is the type being assigned.
-func (s *state) insertWBstore(t *Type, left, right *ssa.Value, line int32, skip skipMask) {
+func (s *state) insertWBstore(t *Type, left, right *ssa.Value, line src.Pos, skip skipMask) {
 	// store scalar fields
 	// if writeBarrier.enabled {
 	//   writebarrierptr for pointer fields
@@ -4378,7 +4381,7 @@ func (s *SSAGenState) Pc() *obj.Prog {
 }
 
 // SetLineno sets the current source line number.
-func (s *SSAGenState) SetLineno(l int32) {
+func (s *SSAGenState) SetLineno(l src.Pos) {
 	lineno = l
 }
 
@@ -4955,7 +4958,7 @@ func (e *ssaExport) CanSSA(t ssa.Type) bool {
 	return canSSAType(t.(*Type))
 }
 
-func (e *ssaExport) Line(line int32) string {
+func (e *ssaExport) Line(line src.Pos) string {
 	return linestr(line)
 }
 
@@ -4971,14 +4974,14 @@ func (e *ssaExport) Log() bool {
 }
 
 // Fatal reports a compiler error and exits.
-func (e *ssaExport) Fatalf(line int32, msg string, args ...interface{}) {
+func (e *ssaExport) Fatalf(line src.Pos, msg string, args ...interface{}) {
 	lineno = line
 	Fatalf(msg, args...)
 }
 
 // Warnl reports a "warning", which is usually flag-triggered
 // logging output for the benefit of tests.
-func (e *ssaExport) Warnl(line int32, fmt_ string, args ...interface{}) {
+func (e *ssaExport) Warnl(line src.Pos, fmt_ string, args ...interface{}) {
 	Warnl(line, fmt_, args...)
 }
 

src/cmd/compile/internal/gc/subr.go

@@ -7,6 +7,7 @@ package gc
 import (
 	"bytes"
 	"cmd/internal/obj"
+	"cmd/internal/src"
 	"crypto/md5"
 	"encoding/binary"
 	"fmt"
@@ -20,7 +21,7 @@ import (
 )
 
 type Error struct {
-	lineno int32
+	lineno src.Pos
 	msg    string
 }
 
@@ -44,7 +45,7 @@ func adderrorname(n *Node) {
 	}
 }
 
-func adderr(line int32, format string, args ...interface{}) {
+func adderr(line src.Pos, format string, args ...interface{}) {
 	errors = append(errors, Error{
 		lineno: line,
 		msg:    fmt.Sprintf("%v: %s\n", linestr(line), fmt.Sprintf(format, args...)),
@@ -85,7 +86,7 @@ func hcrash() {
 	}
 }
 
-func linestr(line int32) string {
+func linestr(line src.Pos) string {
 	return Ctxt.Line(int(line))
 }
 
@@ -93,12 +94,12 @@ func linestr(line int32) string {
 // It is used to avoid multiple error messages on the same
 // line.
 var lasterror struct {
-	syntax int32  // line of last syntax error
-	other  int32  // line of last non-syntax error
-	msg    string // error message of last non-syntax error
+	syntax src.Pos // line of last syntax error
+	other  src.Pos // line of last non-syntax error
+	msg    string  // error message of last non-syntax error
 }
 
-func yyerrorl(line int32, format string, args ...interface{}) {
+func yyerrorl(line src.Pos, format string, args ...interface{}) {
 	msg := fmt.Sprintf(format, args...)
 
 	if strings.HasPrefix(msg, "syntax error") {
@@ -142,7 +143,7 @@ func Warn(fmt_ string, args ...interface{}) {
 	hcrash()
 }
 
-func Warnl(line int32, fmt_ string, args ...interface{}) {
+func Warnl(line src.Pos, fmt_ string, args ...interface{}) {
 	adderr(line, fmt_, args...)
 	if Debug['m'] != 0 {
 		flusherrors()
@@ -200,7 +201,7 @@ func linehistupdate(file string, off int) {
 	Ctxt.LineHist.Update(int(lexlineno), file, off)
 }
 
-func setlineno(n *Node) int32 {
+func setlineno(n *Node) src.Pos {
 	lno := lineno
 	if n != nil {
 		switch n.Op {
@@ -475,7 +476,7 @@ func nodbool(b bool) *Node {
 // Copies of iota ONONAME nodes are assigned the current
 // value of iota_. If lineno != 0, it sets the line number
 // of newly allocated nodes to lineno.
-func treecopy(n *Node, lineno int32) *Node {
+func treecopy(n *Node, lineno src.Pos) *Node {
 	if n == nil {
 		return nil
 	}
@@ -1991,7 +1992,7 @@ func Simsimtype(t *Type) EType {
 	return et
 }
 
-func listtreecopy(l []*Node, lineno int32) []*Node {
+func listtreecopy(l []*Node, lineno src.Pos) []*Node {
 	var out []*Node
 	for _, n := range l {
 		out = append(out, treecopy(n, lineno))

src/cmd/compile/internal/gc/syntax.go

@@ -6,6 +6,8 @@
 
 package gc
 
+import "cmd/internal/src"
+
 // A Node is a single node in the syntax tree.
 // Actually the syntax tree is a syntax DAG, because there is only one
 // node with Op=ONAME for a given instance of a variable x.
@@ -42,7 +44,7 @@ type Node struct {
 	// Possibly still more uses. If you find any, document them.
 	Xoffset int64
 
-	Lineno int32
+	Lineno src.Pos
 
 	Esc uint16 // EscXXX
 
@@ -308,8 +310,8 @@ type Func struct {
 
 	Label int32 // largest auto-generated label in this function
 
-	Endlineno int32
-	WBLineno  int32 // line number of first write barrier
+	Endlineno src.Pos
+	WBLineno  src.Pos // line number of first write barrier
 
 	Pragma          Pragma // go:xxx function annotations
 	Dupok           bool   // duplicate definitions ok

src/cmd/compile/internal/gc/type.go

@@ -11,6 +11,7 @@ package gc
 
 import (
 	"cmd/compile/internal/ssa"
+	"cmd/internal/src"
 	"fmt"
 )
 
@@ -149,9 +150,9 @@ type Type struct {
 	sliceOf *Type
 	ptrTo   *Type
 
-	Sym    *Sym  // symbol containing name, for named types
-	Vargen int32 // unique name for OTYPE/ONAME
-	Lineno int32 // line at which this type was declared, implicitly or explicitly
+	Sym    *Sym    // symbol containing name, for named types
+	Vargen int32   // unique name for OTYPE/ONAME
+	Lineno src.Pos // line at which this type was declared, implicitly or explicitly
 
 	Etype      EType // kind of type
 	Noalg      bool  // suppress hash and eq algorithm generation
@@ -182,7 +183,7 @@ func (t *Type) MapType() *MapType {
 // ForwardType contains Type fields specific to forward types.
 type ForwardType struct {
 	Copyto      []*Node // where to copy the eventual value to
-	Embedlineno int32   // first use of this type as an embedded type
+	Embedlineno src.Pos // first use of this type as an embedded type
 }
 
 // ForwardType returns t's extra forward-type-specific fields.

src/cmd/compile/internal/gc/typecheck.go

@@ -6,6 +6,7 @@ package gc
 
 import (
 	"cmd/internal/obj"
+	"cmd/internal/src"
 	"fmt"
 	"math"
 	"strings"
@@ -3499,7 +3500,7 @@ func domethod(n *Node) {
 
 type mapqueueval struct {
 	n   *Node
-	lno int32
+	lno src.Pos
 }
 
 // tracks the line numbers at which forward types are first used as map keys

src/cmd/compile/internal/ssa/block.go

@@ -4,7 +4,10 @@
 
 package ssa
 
-import "fmt"
+import (
+	"cmd/internal/src"
+	"fmt"
+)
 
 // Block represents a basic block in the control flow graph of a function.
 type Block struct {
@@ -13,7 +16,7 @@ type Block struct {
 	ID ID
 
 	// Line number for block's control operation
-	Line int32
+	Line src.Pos
 
 	// The kind of block this is.
 	Kind BlockKind

src/cmd/compile/internal/ssa/config.go

@@ -6,6 +6,7 @@ package ssa
 
 import (
 	"cmd/internal/obj"
+	"cmd/internal/src"
 	"crypto/sha1"
 	"fmt"
 	"os"
@@ -88,10 +89,10 @@ type Logger interface {
 	Log() bool
 
 	// Fatal reports a compiler error and exits.
-	Fatalf(line int32, msg string, args ...interface{})
+	Fatalf(line src.Pos, msg string, args ...interface{})
 
 	// Warnl writes compiler messages in the form expected by "errorcheck" tests
-	Warnl(line int32, fmt_ string, args ...interface{})
+	Warnl(line src.Pos, fmt_ string, args ...interface{})
 
 	// Fowards the Debug flags from gc
 	Debug_checknil() bool
@@ -120,7 +121,7 @@ type Frontend interface {
 	SplitInt64(LocalSlot) (LocalSlot, LocalSlot) // returns (hi, lo)
 
 	// Line returns a string describing the given line number.
-	Line(int32) string
+	Line(src.Pos) string
 
 	// AllocFrame assigns frame offsets to all live auto variables.
 	AllocFrame(f *Func)
@@ -338,12 +339,14 @@ func (c *Config) NewFunc() *Func {
 	return f
 }
 
-func (c *Config) Logf(msg string, args ...interface{})               { c.fe.Logf(msg, args...) }
-func (c *Config) Log() bool                                          { return c.fe.Log() }
-func (c *Config) Fatalf(line int32, msg string, args ...interface{}) { c.fe.Fatalf(line, msg, args...) }
-func (c *Config) Warnl(line int32, msg string, args ...interface{})  { c.fe.Warnl(line, msg, args...) }
-func (c *Config) Debug_checknil() bool                               { return c.fe.Debug_checknil() }
-func (c *Config) Debug_wb() bool                                     { return c.fe.Debug_wb() }
+func (c *Config) Logf(msg string, args ...interface{}) { c.fe.Logf(msg, args...) }
+func (c *Config) Log() bool                            { return c.fe.Log() }
+func (c *Config) Fatalf(line src.Pos, msg string, args ...interface{}) {
+	c.fe.Fatalf(line, msg, args...)
+}
+func (c *Config) Warnl(line src.Pos, msg string, args ...interface{}) { c.fe.Warnl(line, msg, args...) }
+func (c *Config) Debug_checknil() bool                                { return c.fe.Debug_checknil() }
+func (c *Config) Debug_wb() bool                                      { return c.fe.Debug_wb() }
 
 func (c *Config) logDebugHashMatch(evname, name string) {
 	file := c.logfiles[evname]

src/cmd/compile/internal/ssa/export_test.go

@@ -7,6 +7,7 @@ package ssa
 import (
 	"cmd/internal/obj"
 	"cmd/internal/obj/x86"
+	"cmd/internal/src"
 	"testing"
 )
 
@@ -62,7 +63,7 @@ func (d DummyFrontend) SplitStruct(s LocalSlot, i int) LocalSlot {
 func (d DummyFrontend) SplitArray(s LocalSlot) LocalSlot {
 	return LocalSlot{s.N, s.Type.ElemType(), s.Off}
 }
-func (DummyFrontend) Line(line int32) string {
+func (DummyFrontend) Line(_ src.Pos) string {
 	return "unknown.go:0"
 }
 func (DummyFrontend) AllocFrame(f *Func) {
@@ -74,10 +75,10 @@ func (DummyFrontend) Syslook(s string) interface{} {
 func (d DummyFrontend) Logf(msg string, args ...interface{}) { d.t.Logf(msg, args...) }
 func (d DummyFrontend) Log() bool                            { return true }
 
-func (d DummyFrontend) Fatalf(line int32, msg string, args ...interface{}) { d.t.Fatalf(msg, args...) }
-func (d DummyFrontend) Warnl(line int32, msg string, args ...interface{})  { d.t.Logf(msg, args...) }
-func (d DummyFrontend) Debug_checknil() bool                               { return false }
-func (d DummyFrontend) Debug_wb() bool                                     { return false }
+func (d DummyFrontend) Fatalf(_ src.Pos, msg string, args ...interface{}) { d.t.Fatalf(msg, args...) }
+func (d DummyFrontend) Warnl(_ src.Pos, msg string, args ...interface{})  { d.t.Logf(msg, args...) }
+func (d DummyFrontend) Debug_checknil() bool                              { return false }
+func (d DummyFrontend) Debug_wb() bool                                    { return false }
 
 func (d DummyFrontend) TypeBool() Type    { return TypeBool }
 func (d DummyFrontend) TypeInt8() Type    { return TypeInt8 }

src/cmd/compile/internal/ssa/func.go

@@ -5,6 +5,7 @@
 package ssa
 
 import (
+	"cmd/internal/src"
 	"fmt"
 	"math"
 	"strings"
@@ -79,7 +80,7 @@ func (f *Func) retSparseSet(ss *sparseSet) {
 }
 
 // newValue allocates a new Value with the given fields and places it at the end of b.Values.
-func (f *Func) newValue(op Op, t Type, b *Block, line int32) *Value {
+func (f *Func) newValue(op Op, t Type, b *Block, line src.Pos) *Value {
 	var v *Value
 	if f.freeValues != nil {
 		v = f.freeValues
@@ -186,7 +187,7 @@ func (f *Func) freeBlock(b *Block) {
 }
 
 // NewValue0 returns a new value in the block with no arguments and zero aux values.
-func (b *Block) NewValue0(line int32, op Op, t Type) *Value {
+func (b *Block) NewValue0(line src.Pos, op Op, t Type) *Value {
 	v := b.Func.newValue(op, t, b, line)
 	v.AuxInt = 0
 	v.Args = v.argstorage[:0]
@@ -194,7 +195,7 @@ func (b *Block) NewValue0(line int32, op Op, t Type) *Value {
 }
 
 // NewValue returns a new value in the block with no arguments and an auxint value.
-func (b *Block) NewValue0I(line int32, op Op, t Type, auxint int64) *Value {
+func (b *Block) NewValue0I(line src.Pos, op Op, t Type, auxint int64) *Value {
 	v := b.Func.newValue(op, t, b, line)
 	v.AuxInt = auxint
 	v.Args = v.argstorage[:0]
@@ -202,7 +203,7 @@ func (b *Block) NewValue0I(line int32, op Op, t Type, auxint int64) *Value {
 }
 
 // NewValue returns a new value in the block with no arguments and an aux value.
-func (b *Block) NewValue0A(line int32, op Op, t Type, aux interface{}) *Value {
+func (b *Block) NewValue0A(line src.Pos, op Op, t Type, aux interface{}) *Value {
 	if _, ok := aux.(int64); ok {
 		// Disallow int64 aux values. They should be in the auxint field instead.
 		// Maybe we want to allow this at some point, but for now we disallow it
@@ -217,7 +218,7 @@ func (b *Block) NewValue0A(line int32, op Op, t Type, aux interface{}) *Value {
 }
 
 // NewValue returns a new value in the block with no arguments and both an auxint and aux values.
-func (b *Block) NewValue0IA(line int32, op Op, t Type, auxint int64, aux interface{}) *Value {
+func (b *Block) NewValue0IA(line src.Pos, op Op, t Type, auxint int64, aux interface{}) *Value {
 	v := b.Func.newValue(op, t, b, line)
 	v.AuxInt = auxint
 	v.Aux = aux
@@ -226,7 +227,7 @@ func (b *Block) NewValue0IA(line int32, op Op, t Type, auxint int64, aux interfa
 }
 
 // NewValue1 returns a new value in the block with one argument and zero aux values.
-func (b *Block) NewValue1(line int32, op Op, t Type, arg *Value) *Value {
+func (b *Block) NewValue1(line src.Pos, op Op, t Type, arg *Value) *Value {
 	v := b.Func.newValue(op, t, b, line)
 	v.AuxInt = 0
 	v.Args = v.argstorage[:1]
@@ -236,7 +237,7 @@ func (b *Block) NewValue1(line int32, op Op, t Type, arg *Value) *Value {
 }
 
 // NewValue1I returns a new value in the block with one argument and an auxint value.
-func (b *Block) NewValue1I(line int32, op Op, t Type, auxint int64, arg *Value) *Value {
+func (b *Block) NewValue1I(line src.Pos, op Op, t Type, auxint int64, arg *Value) *Value {
 	v := b.Func.newValue(op, t, b, line)
 	v.AuxInt = auxint
 	v.Args = v.argstorage[:1]
@@ -246,7 +247,7 @@ func (b *Block) NewValue1I(line int32, op Op, t Type, auxint int64, arg *Value)
 }
 
 // NewValue1A returns a new value in the block with one argument and an aux value.
-func (b *Block) NewValue1A(line int32, op Op, t Type, aux interface{}, arg *Value) *Value {
+func (b *Block) NewValue1A(line src.Pos, op Op, t Type, aux interface{}, arg *Value) *Value {
 	v := b.Func.newValue(op, t, b, line)
 	v.AuxInt = 0
 	v.Aux = aux
@@ -257,7 +258,7 @@ func (b *Block) NewValue1A(line int32, op Op, t Type, aux interface{}, arg *Valu
 }
 
 // NewValue1IA returns a new value in the block with one argument and both an auxint and aux values.
-func (b *Block) NewValue1IA(line int32, op Op, t Type, auxint int64, aux interface{}, arg *Value) *Value {
+func (b *Block) NewValue1IA(line src.Pos, op Op, t Type, auxint int64, aux interface{}, arg *Value) *Value {
 	v := b.Func.newValue(op, t, b, line)
 	v.AuxInt = auxint
 	v.Aux = aux
@@ -268,7 +269,7 @@ func (b *Block) NewValue1IA(line int32, op Op, t Type, auxint int64, aux interfa
 }
 
 // NewValue2 returns a new value in the block with two arguments and zero aux values.
-func (b *Block) NewValue2(line int32, op Op, t Type, arg0, arg1 *Value) *Value {
+func (b *Block) NewValue2(line src.Pos, op Op, t Type, arg0, arg1 *Value) *Value {
 	v := b.Func.newValue(op, t, b, line)
 	v.AuxInt = 0
 	v.Args = v.argstorage[:2]
@@ -280,7 +281,7 @@ func (b *Block) NewValue2(line int32, op Op, t Type, arg0, arg1 *Value) *Value {
 }
 
 // NewValue2I returns a new value in the block with two arguments and an auxint value.
-func (b *Block) NewValue2I(line int32, op Op, t Type, auxint int64, arg0, arg1 *Value) *Value {
+func (b *Block) NewValue2I(line src.Pos, op Op, t Type, auxint int64, arg0, arg1 *Value) *Value {
 	v := b.Func.newValue(op, t, b, line)
 	v.AuxInt = auxint
 	v.Args = v.argstorage[:2]
@@ -292,7 +293,7 @@ func (b *Block) NewValue2I(line int32, op Op, t Type, auxint int64, arg0, arg1 *
 }
 
 // NewValue3 returns a new value in the block with three arguments and zero aux values.
-func (b *Block) NewValue3(line int32, op Op, t Type, arg0, arg1, arg2 *Value) *Value {
+func (b *Block) NewValue3(line src.Pos, op Op, t Type, arg0, arg1, arg2 *Value) *Value {
 	v := b.Func.newValue(op, t, b, line)
 	v.AuxInt = 0
 	v.Args = v.argstorage[:3]
@@ -306,7 +307,7 @@ func (b *Block) NewValue3(line int32, op Op, t Type, arg0, arg1, arg2 *Value) *V
 }
 
 // NewValue3I returns a new value in the block with three arguments and an auxint value.
-func (b *Block) NewValue3I(line int32, op Op, t Type, auxint int64, arg0, arg1, arg2 *Value) *Value {
+func (b *Block) NewValue3I(line src.Pos, op Op, t Type, auxint int64, arg0, arg1, arg2 *Value) *Value {
 	v := b.Func.newValue(op, t, b, line)
 	v.AuxInt = auxint
 	v.Args = v.argstorage[:3]
@@ -320,7 +321,7 @@ func (b *Block) NewValue3I(line int32, op Op, t Type, auxint int64, arg0, arg1,
 }
 
 // NewValue4 returns a new value in the block with four arguments and zero aux values.
-func (b *Block) NewValue4(line int32, op Op, t Type, arg0, arg1, arg2, arg3 *Value) *Value {
+func (b *Block) NewValue4(line src.Pos, op Op, t Type, arg0, arg1, arg2, arg3 *Value) *Value {
 	v := b.Func.newValue(op, t, b, line)
 	v.AuxInt = 0
 	v.Args = []*Value{arg0, arg1, arg2, arg3}
@@ -332,7 +333,7 @@ func (b *Block) NewValue4(line int32, op Op, t Type, arg0, arg1, arg2, arg3 *Val
 }
 
 // constVal returns a constant value for c.
-func (f *Func) constVal(line int32, op Op, t Type, c int64, setAux bool) *Value {
+func (f *Func) constVal(line src.Pos, op Op, t Type, c int64, setAux bool) *Value {
 	if f.constants == nil {
 		f.constants = make(map[int64][]*Value)
 	}
@@ -367,42 +368,42 @@ const (
 )
 
 // ConstInt returns an int constant representing its argument.
-func (f *Func) ConstBool(line int32, t Type, c bool) *Value {
+func (f *Func) ConstBool(line src.Pos, t Type, c bool) *Value {
 	i := int64(0)
 	if c {
 		i = 1
 	}
 	return f.constVal(line, OpConstBool, t, i, true)
 }
-func (f *Func) ConstInt8(line int32, t Type, c int8) *Value {
+func (f *Func) ConstInt8(line src.Pos, t Type, c int8) *Value {
 	return f.constVal(line, OpConst8, t, int64(c), true)
 }
-func (f *Func) ConstInt16(line int32, t Type, c int16) *Value {
+func (f *Func) ConstInt16(line src.Pos, t Type, c int16) *Value {
 	return f.constVal(line, OpConst16, t, int64(c), true)
 }
-func (f *Func) ConstInt32(line int32, t Type, c int32) *Value {
+func (f *Func) ConstInt32(line src.Pos, t Type, c int32) *Value {
 	return f.constVal(line, OpConst32, t, int64(c), true)
 }
-func (f *Func) ConstInt64(line int32, t Type, c int64) *Value {
+func (f *Func) ConstInt64(line src.Pos, t Type, c int64) *Value {
 	return f.constVal(line, OpConst64, t, c, true)
 }
-func (f *Func) ConstFloat32(line int32, t Type, c float64) *Value {
+func (f *Func) ConstFloat32(line src.Pos, t Type, c float64) *Value {
 	return f.constVal(line, OpConst32F, t, int64(math.Float64bits(float64(float32(c)))), true)
 }
-func (f *Func) ConstFloat64(line int32, t Type, c float64) *Value {
+func (f *Func) ConstFloat64(line src.Pos, t Type, c float64) *Value {
 	return f.constVal(line, OpConst64F, t, int64(math.Float64bits(c)), true)
 }
 
-func (f *Func) ConstSlice(line int32, t Type) *Value {
+func (f *Func) ConstSlice(line src.Pos, t Type) *Value {
 	return f.constVal(line, OpConstSlice, t, constSliceMagic, false)
 }
-func (f *Func) ConstInterface(line int32, t Type) *Value {
+func (f *Func) ConstInterface(line src.Pos, t Type) *Value {
 	return f.constVal(line, OpConstInterface, t, constInterfaceMagic, false)
 }
-func (f *Func) ConstNil(line int32, t Type) *Value {
+func (f *Func) ConstNil(line src.Pos, t Type) *Value {
 	return f.constVal(line, OpConstNil, t, constNilMagic, false)
 }
-func (f *Func) ConstEmptyString(line int32, t Type) *Value {
+func (f *Func) ConstEmptyString(line src.Pos, t Type) *Value {
 	v := f.constVal(line, OpConstString, t, constEmptyStringMagic, false)
 	v.Aux = ""
 	return v

src/cmd/compile/internal/ssa/regalloc.go

@@ -107,6 +107,7 @@ package ssa
 
 import (
 	"cmd/internal/obj"
+	"cmd/internal/src"
 	"fmt"
 	"unsafe"
 )
@@ -180,9 +181,9 @@ func pickReg(r regMask) register {
 }
 
 type use struct {
-	dist int32 // distance from start of the block to a use of a value
-	line int32 // line number of the use
-	next *use  // linked list of uses of a value in nondecreasing dist order
+	dist int32   // distance from start of the block to a use of a value
+	line src.Pos // line number of the use
+	next *use    // linked list of uses of a value in nondecreasing dist order
 }
 
 type valState struct {
@@ -287,8 +288,8 @@ type endReg struct {
 
 type startReg struct {
 	r    register
-	vid  ID    // pre-regalloc value needed in this register
-	line int32 // line number of use of this register
+	vid  ID      // pre-regalloc value needed in this register
+	line src.Pos // line number of use of this register
 }
 
 // freeReg frees up register r. Any current user of r is kicked out.
@@ -410,7 +411,7 @@ func (s *regAllocState) allocReg(mask regMask, v *Value) register {
 // allocated register is marked nospill so the assignment cannot be
 // undone until the caller allows it by clearing nospill. Returns a
 // *Value which is either v or a copy of v allocated to the chosen register.
-func (s *regAllocState) allocValToReg(v *Value, mask regMask, nospill bool, line int32) *Value {
+func (s *regAllocState) allocValToReg(v *Value, mask regMask, nospill bool, line src.Pos) *Value {
 	vi := &s.values[v.ID]
 
 	// Check if v is already in a requested register.
@@ -617,7 +618,7 @@ func (s *regAllocState) init(f *Func) {
 
 // Adds a use record for id at distance dist from the start of the block.
 // All calls to addUse must happen with nonincreasing dist.
-func (s *regAllocState) addUse(id ID, dist int32, line int32) {
+func (s *regAllocState) addUse(id ID, dist int32, line src.Pos) {
 	r := s.freeUseRecords
 	if r != nil {
 		s.freeUseRecords = r.next
@@ -1878,17 +1879,17 @@ type edgeState struct {
 }
 
 type contentRecord struct {
-	vid   ID     // pre-regalloc value
-	c     *Value // cached value
-	final bool   // this is a satisfied destination
-	line  int32  // line number of use of the value
+	vid   ID      // pre-regalloc value
+	c     *Value  // cached value
+	final bool    // this is a satisfied destination
+	line  src.Pos // line number of use of the value
 }
 
 type dstRecord struct {
 	loc    Location // register or stack slot
 	vid    ID       // pre-regalloc value it should contain
 	splice **Value  // place to store reference to the generating instruction
-	line   int32    // line number of use of this location
+	line   src.Pos  // line number of use of this location
 }
 
 // setup initializes the edge state for shuffling.
@@ -2017,7 +2018,7 @@ func (e *edgeState) process() {
 
 // processDest generates code to put value vid into location loc. Returns true
 // if progress was made.
-func (e *edgeState) processDest(loc Location, vid ID, splice **Value, line int32) bool {
+func (e *edgeState) processDest(loc Location, vid ID, splice **Value, line src.Pos) bool {
 	occupant := e.contents[loc]
 	if occupant.vid == vid {
 		// Value is already in the correct place.
@@ -2139,7 +2140,7 @@ func (e *edgeState) processDest(loc Location, vid ID, splice **Value, line int32
 }
 
 // set changes the contents of location loc to hold the given value and its cached representative.
-func (e *edgeState) set(loc Location, vid ID, c *Value, final bool, line int32) {
+func (e *edgeState) set(loc Location, vid ID, c *Value, final bool, line src.Pos) {
 	e.s.f.setHome(c, loc)
 	e.erase(loc)
 	e.contents[loc] = contentRecord{vid, c, final, line}
@@ -2290,9 +2291,9 @@ func (v *Value) rematerializeable() bool {
 }
 
 type liveInfo struct {
-	ID   ID    // ID of value
-	dist int32 // # of instructions before next use
-	line int32 // line number of next use
+	ID   ID      // ID of value
+	dist int32   // # of instructions before next use
+	line src.Pos // line number of next use
 }
 
 // dblock contains information about desired & avoid registers at the end of a block.

src/cmd/compile/internal/ssa/sparsemap.go

@@ -4,13 +4,15 @@
 
 package ssa
 
+import "cmd/internal/src"
+
 // from http://research.swtch.com/sparse
 // in turn, from Briggs and Torczon
 
 type sparseEntry struct {
 	key ID
 	val int32
-	aux int32
+	aux src.Pos
 }
 
 type sparseMap struct {
@@ -43,7 +45,7 @@ func (s *sparseMap) get(k ID) int32 {
 	return -1
 }
 
-func (s *sparseMap) set(k ID, v, a int32) {
+func (s *sparseMap) set(k ID, v int32, a src.Pos) {
 	i := s.sparse[k]
 	if i < int32(len(s.dense)) && s.dense[i].key == k {
 		s.dense[i].val = v

src/cmd/compile/internal/ssa/value.go

@@ -5,6 +5,7 @@
 package ssa
 
 import (
+	"cmd/internal/src"
 	"fmt"
 	"math"
 )
@@ -37,7 +38,7 @@ type Value struct {
 	Block *Block
 
 	// Source line number
-	Line int32
+	Line src.Pos
 
 	// Use count. Each appearance in Value.Args and Block.Control counts once.
 	Uses int32

src/cmd/compile/internal/ssa/writebarrier.go

@@ -4,7 +4,10 @@
 
 package ssa
 
-import "fmt"
+import (
+	"cmd/internal/src"
+	"fmt"
+)
 
 // writebarrier expands write barrier ops (StoreWB, MoveWB, etc.) into
 // branches and runtime calls, like
@@ -237,7 +240,7 @@ func writebarrier(f *Func) {
 
 // wbcall emits write barrier runtime call in b, returns memory.
 // if valIsVolatile, it moves val into temp space before making the call.
-func wbcall(line int32, b *Block, fn interface{}, typ interface{}, ptr, val, mem, sp, sb *Value, valIsVolatile bool) *Value {
+func wbcall(line src.Pos, b *Block, fn interface{}, typ interface{}, ptr, val, mem, sp, sb *Value, valIsVolatile bool) *Value {
 	config := b.Func.Config
 
 	var tmp GCNode

src/cmd/dist/buildtool.go

@@ -54,6 +54,7 @@ var bootstrapDirs = []string{
 	"cmd/internal/obj/ppc64",
 	"cmd/internal/obj/s390x",
 	"cmd/internal/obj/x86",
+	"cmd/internal/src",
 	"cmd/internal/sys",
 	"cmd/link",
 	"cmd/link/internal/amd64",

src/cmd/internal/src/src.go

+// Copyright 2016 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 src implements source positions.
+package src
+
+// A Pos represents a source position.
+// It is an index into the global line table, which
+// maps a Pos to a file name and source line number.
+type Pos int32