--- /dev/null
- if rs := reporter.lookup(r.Sym.Name, v); rs != nil && rs.Type != sym.Sxxx {
+// Copyright 2020 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 ld
+
+import (
+ "cmd/internal/obj"
+ "cmd/link/internal/loader"
+ "cmd/link/internal/sym"
+ "fmt"
+ "os"
+ "sync"
+)
+
+type unresolvedSymKey struct {
+ from *sym.Symbol // Symbol that referenced unresolved "to"
+ to *sym.Symbol // Unresolved symbol referenced by "from"
+}
+
+type lookupFn func(name string, version int) *sym.Symbol
+type symNameFn func(s loader.Sym) string
+
+// ErrorReporter is used to make error reporting thread safe.
+type ErrorReporter struct {
+ unresOnce sync.Once
+ unresSyms map[unresolvedSymKey]bool
+ unresMutex sync.Mutex
+ lookup lookupFn
+ SymName symNameFn
+}
+
+// errorUnresolved prints unresolved symbol error for r.Sym that is referenced from s.
+func (reporter *ErrorReporter) errorUnresolved(s *sym.Symbol, r *sym.Reloc) {
+ reporter.unresOnce.Do(func() { reporter.unresSyms = make(map[unresolvedSymKey]bool) })
+
+ k := unresolvedSymKey{from: s, to: r.Sym}
+ reporter.unresMutex.Lock()
+ defer reporter.unresMutex.Unlock()
+ if !reporter.unresSyms[k] {
+ reporter.unresSyms[k] = true
+
+ // Try to find symbol under another ABI.
+ var reqABI, haveABI obj.ABI
+ haveABI = ^obj.ABI(0)
+ reqABI, ok := sym.VersionToABI(int(r.Sym.Version))
+ if ok {
+ for abi := obj.ABI(0); abi < obj.ABICount; abi++ {
+ v := sym.ABIToVersion(abi)
+ if v == -1 {
+ continue
+ }
++ if rs := reporter.lookup(r.Sym.Name, v); rs != nil && rs.Type != sym.Sxxx && rs.Type != sym.SXREF {
+ haveABI = abi
+ }
+ }
+ }
+
+ // Give a special error message for main symbol (see #24809).
+ if r.Sym.Name == "main.main" {
+ Errorf(s, "function main is undeclared in the main package")
+ } else if haveABI != ^obj.ABI(0) {
+ Errorf(s, "relocation target %s not defined for %s (but is defined for %s)", r.Sym.Name, reqABI, haveABI)
+ } else {
+ Errorf(s, "relocation target %s not defined", r.Sym.Name)
+ }
+ }
+}
+
+// Errorf method logs an error message.
+//
+// If more than 20 errors have been printed, exit with an error.
+//
+// Logging an error means that on exit cmd/link will delete any
+// output file and return a non-zero error code.
+// TODO: consolidate the various different versions of Errorf (
+// function, Link method, and ErrorReporter method).
+func (reporter *ErrorReporter) Errorf(s loader.Sym, format string, args ...interface{}) {
+ if s != 0 && reporter.SymName != nil {
+ sn := reporter.SymName(s)
+ format = sn + ": " + format
+ } else {
+ format = fmt.Sprintf("sym %d: %s", s, format)
+ }
+ format += "\n"
+ fmt.Fprintf(os.Stderr, format, args...)
+ afterErrorAction()
+}