Update modules to go 1.16.3 code

_internal_/cfg/cfg.go

@@ -58,6 +58,7 @@ const KnownEnv = `
 	GOSUMDB
 	GOTMPDIR
 	GOTOOLDIR
+	GOVCS
 	GOWASM
 	GO_EXTLINK_ENABLED
 	PKG_CONFIG

_internal_/execabs/execabs.go

@@ -0,0 +1,70 @@
+// Copyright 2021 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 execabs is a drop-in replacement for os/exec
+// that requires PATH lookups to find absolute paths.
+// That is, execabs.Command("cmd") runs the same PATH lookup
+// as exec.Command("cmd"), but if the result is a path
+// which is relative, the Run and Start methods will report
+// an error instead of running the executable.
+package execabs
+
+import (
+	"context"
+	"fmt"
+	"os/exec"
+	"path/filepath"
+	"reflect"
+	"unsafe"
+)
+
+var ErrNotFound = exec.ErrNotFound
+
+type (
+	Cmd		= exec.Cmd
+	Error		= exec.Error
+	ExitError	= exec.ExitError
+)
+
+func relError(file, path string) error {
+	return fmt.Errorf("%s resolves to executable relative to current directory (.%c%s)", file, filepath.Separator, path)
+}
+
+func LookPath(file string) (string, error) {
+	path, err := exec.LookPath(file)
+	if err != nil {
+		return "", err
+	}
+	if filepath.Base(file) == file && !filepath.IsAbs(path) {
+		return "", relError(file, path)
+	}
+	return path, nil
+}
+
+func fixCmd(name string, cmd *exec.Cmd) {
+	if filepath.Base(name) == name && !filepath.IsAbs(cmd.Path) {
+		// exec.Command was called with a bare binary name and
+		// exec.LookPath returned a path which is not absolute.
+		// Set cmd.lookPathErr and clear cmd.Path so that it
+		// cannot be run.
+		lookPathErr := (*error)(unsafe.Pointer(reflect.ValueOf(cmd).Elem().FieldByName("lookPathErr").Addr().Pointer()))
+		if *lookPathErr == nil {
+			*lookPathErr = relError(name, cmd.Path)
+		}
+		cmd.Path = ""
+	}
+}
+
+func CommandContext(ctx context.Context, name string, arg ...string) *exec.Cmd {
+	cmd := exec.CommandContext(ctx, name, arg...)
+	fixCmd(name, cmd)
+	return cmd
+
+}
+
+func Command(name string, arg ...string) *exec.Cmd {
+	cmd := exec.Command(name, arg...)
+	fixCmd(name, cmd)
+	return cmd
+}

_internal_/goroot/gc.go

@@ -7,8 +7,8 @@
 package goroot
 
 import (
+	exec "github.com/dependabot/gomodules-extracted/_internal_/execabs"
 	"os"
-	"os/exec"
 	"path/filepath"
 	"strings"
 	"sync"

cmd/_internal_/browser/browser.go

@@ -6,8 +6,8 @@
 package browser
 
 import (
+	exec "github.com/dependabot/gomodules-extracted/_internal_/execabs"
 	"os"
-	"os/exec"
 	"runtime"
 	"time"
 )

cmd/_internal_/objabi/flag.go

@@ -5,6 +5,7 @@
 package objabi
 
 import (
+	"bytes"
 	"flag"
 	"fmt"
 	"io"
@@ -59,6 +60,9 @@ func expandArgs(in []string) (out []string) {
 				log.Fatal(err)
 			}
 			args := strings.Split(strings.TrimSpace(strings.Replace(string(slurp), "\r", "", -1)), "\n")
+			for i, arg := range args {
+				args[i] = DecodeArg(arg)
+			}
 			out = append(out, expandArgs(args)...)
 		} else if out != nil {
 			out = append(out, s)
@@ -160,3 +164,38 @@ func (f fn1) Set(s string) error {
 }
 
 func (f fn1) String() string	{ return "" }
+
+// DecodeArg decodes an argument.
+//
+// This function is public for testing with the parallel encoder.
+func DecodeArg(arg string) string {
+	// If no encoding, fastpath out.
+	if !strings.ContainsAny(arg, "\\\n") {
+		return arg
+	}
+
+	// We can't use strings.Builder as this must work at bootstrap.
+	var b bytes.Buffer
+	var wasBS bool
+	for _, r := range arg {
+		if wasBS {
+			switch r {
+			case '\\':
+				b.WriteByte('\\')
+			case 'n':
+				b.WriteByte('\n')
+			default:
+				// This shouldn't happen. The only backslashes that reach here
+				// should encode '\n' and '\\' exclusively.
+				panic("badly formatted input")
+			}
+		} else if r == '\\' {
+			wasBS = true
+			continue
+		} else {
+			b.WriteRune(r)
+		}
+		wasBS = false
+	}
+	return b.String()
+}

cmd/_internal_/objabi/funcdata.go

@@ -11,17 +11,15 @@ package objabi
 // ../../../runtime/symtab.go.
 
 const (
-	PCDATA_RegMapIndex	= 0	// if !go115ReduceLiveness
-	PCDATA_UnsafePoint	= 0	// if go115ReduceLiveness
+	PCDATA_UnsafePoint	= 0
 	PCDATA_StackMapIndex	= 1
 	PCDATA_InlTreeIndex	= 2
 
 	FUNCDATA_ArgsPointerMaps	= 0
 	FUNCDATA_LocalsPointerMaps	= 1
-	FUNCDATA_RegPointerMaps		= 2	// if !go115ReduceLiveness
-	FUNCDATA_StackObjects		= 3
-	FUNCDATA_InlTree		= 4
-	FUNCDATA_OpenCodedDeferInfo	= 5
+	FUNCDATA_StackObjects		= 2
+	FUNCDATA_InlTree		= 3
+	FUNCDATA_OpenCodedDeferInfo	= 4
 
 	// ArgsSizeUnknown is set in Func.argsize to mark all functions
 	// whose argument size is unknown (C vararg functions, and
@@ -32,11 +30,6 @@ const (
 
 // Special PCDATA values.
 const (
-	// PCDATA_RegMapIndex values.
-	//
-	// Only if !go115ReduceLiveness.
-	PCDATA_RegMapUnsafe	= -2	// Unsafe for async preemption
-
 	// PCDATA_UnsafePoint values.
 	PCDATA_UnsafePointSafe		= -1	// Safe for async preemption
 	PCDATA_UnsafePointUnsafe	= -2	// Unsafe for async preemption

cmd/_internal_/objabi/funcid.go

@@ -4,11 +4,6 @@
 
 package objabi
 
-import (
-	"strconv"
-	"strings"
-)
-
 // A FuncID identifies particular functions that need to be treated
 // specially by the runtime.
 // Note that in some situations involving plugins, there may be multiple
@@ -31,7 +26,7 @@ const (
 	FuncID_gcBgMarkWorker
 	FuncID_systemstack_switch
 	FuncID_systemstack
-	FuncID_cgocallback_gofunc
+	FuncID_cgocallback
 	FuncID_gogo
 	FuncID_externalthreadhandler
 	FuncID_debugCallV1
@@ -44,7 +39,10 @@ const (
 
 // Get the function ID for the named function in the named file.
 // The function should be package-qualified.
-func GetFuncID(name, file string) FuncID {
+func GetFuncID(name string, isWrapper bool) FuncID {
+	if isWrapper {
+		return FuncID_wrapper
+	}
 	switch name {
 	case "runtime.main":
 		return FuncID_runtime_main
@@ -72,8 +70,8 @@ func GetFuncID(name, file string) FuncID {
 		return FuncID_systemstack_switch
 	case "runtime.systemstack":
 		return FuncID_systemstack
-	case "runtime.cgocallback_gofunc":
-		return FuncID_cgocallback_gofunc
+	case "runtime.cgocallback":
+		return FuncID_cgocallback
 	case "runtime.gogo":
 		return FuncID_gogo
 	case "runtime.externalthreadhandler":
@@ -98,17 +96,5 @@ func GetFuncID(name, file string) FuncID {
 		// Don't show in the call stack (used when invoking defer functions)
 		return FuncID_wrapper
 	}
-	if file == "<autogenerated>" {
-		return FuncID_wrapper
-	}
-	if strings.HasPrefix(name, "runtime.call") {
-		if _, err := strconv.Atoi(name[12:]); err == nil {
-			// runtime.callXX reflect call wrappers.
-			return FuncID_wrapper
-		}
-	}
-	if strings.HasSuffix(name, "-fm") {
-		return FuncID_wrapper
-	}
 	return FuncID_normal
 }

cmd/_internal_/objabi/head.go

@@ -54,7 +54,7 @@ func (h *HeadType) Set(s string) error {
 	switch s {
 	case "aix":
 		*h = Haix
-	case "darwin":
+	case "darwin", "ios":
 		*h = Hdarwin
 	case "dragonfly":
 		*h = Hdragonfly

cmd/_internal_/objabi/line.go

@@ -37,25 +37,36 @@ func AbsFile(dir, file, rewrites string) string {
 		abs = filepath.Join(dir, file)
 	}
 
+	abs, rewritten := ApplyRewrites(abs, rewrites)
+	if !rewritten && hasPathPrefix(abs, GOROOT) {
+		abs = "$GOROOT" + abs[len(GOROOT):]
+	}
+
+	if abs == "" {
+		abs = "??"
+	}
+	return abs
+}
+
+// ApplyRewrites returns the filename for file in the given directory,
+// as rewritten by the rewrites argument.
+//
+// The rewrites argument is a ;-separated list of rewrites.
+// Each rewrite is of the form "prefix" or "prefix=>replace",
+// where prefix must match a leading sequence of path elements
+// and is either removed entirely or replaced by the replacement.
+func ApplyRewrites(file, rewrites string) (string, bool) {
 	start := 0
 	for i := 0; i <= len(rewrites); i++ {
 		if i == len(rewrites) || rewrites[i] == ';' {
-			if new, ok := applyRewrite(abs, rewrites[start:i]); ok {
-				abs = new
-				goto Rewritten
+			if new, ok := applyRewrite(file, rewrites[start:i]); ok {
+				return new, true
 			}
 			start = i + 1
 		}
 	}
-	if hasPathPrefix(abs, GOROOT) {
-		abs = "$GOROOT" + abs[len(GOROOT):]
-	}
 
-Rewritten:
-	if abs == "" {
-		abs = "??"
-	}
-	return abs
+	return file, false
 }
 
 // applyRewrite applies the rewrite to the path,

cmd/_internal_/objabi/path.go

@@ -39,3 +39,25 @@ func PathToPrefix(s string) string {
 
 	return string(p)
 }
+
+// IsRuntimePackagePath examines 'pkgpath' and returns TRUE if it
+// belongs to the collection of "runtime-related" packages, including
+// "runtime" itself, "reflect", "syscall", and the
+// "runtime/internal/*" packages. The compiler and/or assembler in
+// some cases need to be aware of when they are building such a
+// package, for example to enable features such as ABI selectors in
+// assembly sources.
+func IsRuntimePackagePath(pkgpath string) bool {
+	rval := false
+	switch pkgpath {
+	case "runtime":
+		rval = true
+	case "reflect":
+		rval = true
+	case "syscall":
+		rval = true
+	default:
+		rval = strings.HasPrefix(pkgpath, "runtime/internal")
+	}
+	return rval
+}

cmd/_internal_/objabi/reloctype.go

@@ -89,6 +89,17 @@ const (
 	// should be linked into the final binary, even if there are no other
 	// direct references. (This is used for types reachable by reflection.)
 	R_USETYPE
+	// R_USEIFACE marks a type is converted to an interface in the function this
+	// relocation is applied to. The target is a type descriptor.
+	// This is a marker relocation (0-sized), for the linker's reachabililty
+	// analysis.
+	R_USEIFACE
+	// R_USEIFACEMETHOD marks an interface method that is used in the function
+	// this relocation is applied to. The target is an interface type descriptor.
+	// The addend is the offset of the method in the type descriptor.
+	// This is a marker relocation (0-sized), for the linker's reachabililty
+	// analysis.
+	R_USEIFACEMETHOD
 	// R_METHODOFF resolves to a 32-bit offset from the beginning of the section
 	// holding the data being relocated to the referenced symbol.
 	// It is a variant of R_ADDROFF used when linking from the uncommonType of a
@@ -145,6 +156,9 @@ const (
 	// R_ARM64_LDST8 sets a LD/ST immediate value to bits [11:0] of a local address.
 	R_ARM64_LDST8
 
+	// R_ARM64_LDST16 sets a LD/ST immediate value to bits [11:1] of a local address.
+	R_ARM64_LDST16
+
 	// R_ARM64_LDST32 sets a LD/ST immediate value to bits [11:2] of a local address.
 	R_ARM64_LDST32
 
@@ -212,6 +226,14 @@ const (
 	// AUIPC + S-type instruction pair.
 	R_RISCV_PCREL_STYPE
 
+	// R_RISCV_TLS_IE_ITYPE resolves a 32-bit TLS initial-exec TOC offset
+	// address using an AUIPC + I-type instruction pair.
+	R_RISCV_TLS_IE_ITYPE
+
+	// R_RISCV_TLS_IE_STYPE resolves a 32-bit TLS initial-exec TOC offset
+	// address using an AUIPC + S-type instruction pair.
+	R_RISCV_TLS_IE_STYPE
+
 	// R_PCRELDBL relocates s390x 2-byte aligned PC-relative addresses.
 	// TODO(mundaym): remove once variants can be serialized - see issue 14218.
 	R_PCRELDBL