[dev.link] cmd/link: remove global datap, moved to *Link

This change moves datap from global space into the link context. Rather
than having it exist in context, we could have it returned from dodata,
and pass it as a parameter, but it is used in awkward places in the
Arch functions. Easiest for now is just keeping it in the context, until
we more formally move it to slices of loader.Sym.

This is a largely non-functional change.

Change-Id: Ica93bd857c39913ad470a61c63bc8d21704d6308
Reviewed-on: https://go-review.googlesource.com/c/go/+/222664
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

src/cmd/link/internal/ld/data.go

@@ -586,7 +586,7 @@ func (ctxt *Link) reloc() {
 		wg.Done()
 	}()
 	go func() {
-		for _, s := range datap {
+		for _, s := range ctxt.datap {
 			relocsym(target, reporter, lookup, syms, s)
 		}
 		wg.Done()
@@ -844,14 +844,14 @@ func writeDatblkToOutBuf(ctxt *Link, out *OutBuf, addr int64, size int64) {
 		ctxt.Logf("datblk [%#x,%#x) at offset %#x\n", addr, addr+size, ctxt.Out.Offset())
 	}
 
-	blk(out, datap, addr, size, zeros[:])
+	blk(out, ctxt.datap, addr, size, zeros[:])
 
 	/* again for printing */
 	if !*flagA {
 		return
 	}
 
-	syms := datap
+	syms := ctxt.datap
 	for i, sym := range syms {
 		if sym.Value >= addr {
 			syms = syms[i:]
@@ -1277,10 +1277,6 @@ func makeRelroForSharedLib(target *Link, data *[sym.SXREF][]*sym.Symbol) {
 	}
 }
 
-// datap is a collection of reachable data symbols in address order.
-// Generated by dodata.
-var datap []*sym.Symbol
-
 func (ctxt *Link) dodata() {
 	// Give zeros sized symbols space if necessary.
 	fixZeroSizedSymbols(ctxt)
@@ -1798,7 +1794,7 @@ func (ctxt *Link) dodata() {
 	}
 
 	for symn := sym.SELFRXSECT; symn < sym.SXREF; symn++ {
-		datap = append(datap, data[symn]...)
+		ctxt.datap = append(ctxt.datap, data[symn]...)
 	}
 
 	dwarfGenerateDebugSyms(ctxt)
@@ -2344,7 +2340,7 @@ func (ctxt *Link) address() []*sym.Segment {
 		}
 	}
 
-	for _, s := range datap {
+	for _, s := range ctxt.datap {
 		if s.Sect != nil {
 			s.Value += int64(s.Sect.Vaddr)
 		}

src/cmd/link/internal/ld/elf.go

@@ -1415,18 +1415,18 @@ func Elfemitreloc(ctxt *Link) {
 		if sect.Name == ".text" {
 			elfrelocsect(ctxt, sect, ctxt.Textp)
 		} else {
-			elfrelocsect(ctxt, sect, datap)
+			elfrelocsect(ctxt, sect, ctxt.datap)
 		}
 	}
 
 	for _, sect := range Segrodata.Sections {
-		elfrelocsect(ctxt, sect, datap)
+		elfrelocsect(ctxt, sect, ctxt.datap)
 	}
 	for _, sect := range Segrelrodata.Sections {
-		elfrelocsect(ctxt, sect, datap)
+		elfrelocsect(ctxt, sect, ctxt.datap)
 	}
 	for _, sect := range Segdata.Sections {
-		elfrelocsect(ctxt, sect, datap)
+		elfrelocsect(ctxt, sect, ctxt.datap)
 	}
 	for _, sect := range Segdwarf.Sections {
 		elfrelocsect(ctxt, sect, dwarfp)

src/cmd/link/internal/ld/lib.go

@@ -2605,7 +2605,7 @@ func (ctxt *Link) undef() {
 	for _, s := range ctxt.Textp {
 		undefsym(ctxt, s)
 	}
-	for _, s := range datap {
+	for _, s := range ctxt.datap {
 		undefsym(ctxt, s)
 	}
 	if nerrors > 0 {

src/cmd/link/internal/ld/link.go

@@ -91,6 +91,8 @@ type Link struct {
 
 	cgo_export_static  map[string]bool
 	cgo_export_dynamic map[string]bool
+
+	datap []*sym.Symbol
 }
 
 type cgodata struct {

src/cmd/link/internal/ld/macho.go

@@ -1060,10 +1060,10 @@ func Machoemitreloc(ctxt *Link) {
 
 	machorelocsect(ctxt, Segtext.Sections[0], ctxt.Textp)
 	for _, sect := range Segtext.Sections[1:] {
-		machorelocsect(ctxt, sect, datap)
+		machorelocsect(ctxt, sect, ctxt.datap)
 	}
 	for _, sect := range Segdata.Sections {
-		machorelocsect(ctxt, sect, datap)
+		machorelocsect(ctxt, sect, ctxt.datap)
 	}
 	for _, sect := range Segdwarf.Sections {
 		machorelocsect(ctxt, sect, dwarfp)

src/cmd/link/internal/ld/pe.go

@@ -543,8 +543,8 @@ func (f *peFile) emitRelocations(ctxt *Link) {
 		syms   []*sym.Symbol
 	}{
 		{f.textSect, &Segtext, ctxt.Textp},
-		{f.rdataSect, &Segrodata, datap},
+		{f.rdataSect, &Segrodata, ctxt.datap},
-		{f.dataSect, &Segdata, datap},
+		{f.dataSect, &Segdata, ctxt.datap},
 	}
 	for _, s := range sects {
 		s.peSect.emitRelocations(ctxt.Out, func() int {
@@ -1434,7 +1434,7 @@ func addPEBaseReloc(ctxt *Link) {
 	for _, s := range ctxt.Textp {
 		addPEBaseRelocSym(ctxt, s, &rt)
 	}
-	for _, s := range datap {
+	for _, s := range ctxt.datap {
 		addPEBaseRelocSym(ctxt, s, &rt)
 	}
 

src/cmd/link/internal/ld/xcoff.go

@@ -1630,7 +1630,7 @@ func (f *xcoffFile) emitRelocations(ctxt *Link, fileoff int64) {
 				if sect.Name == ".text" {
 					n += relocsect(sect, ctxt.Textp, 0)
 				} else {
-					n += relocsect(sect, datap, 0)
+					n += relocsect(sect, ctxt.datap, 0)
 				}
 			}
 		}