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// 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()
}
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