go errors 源码
golang errors 代码
文件路径：/src/cmd/link/internal/ld/errors.go
// 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"
"sync"
)
type unresolvedSymKey struct {
from loader.Sym // Symbol that referenced unresolved "to"
to loader.Sym // Unresolved symbol referenced by "from"
}
type symNameFn func(s loader.Sym) string
// ErrorReporter is used to make error reporting thread safe.
type ErrorReporter struct {
loader.ErrorReporter
unresOnce sync.Once
unresSyms map[unresolvedSymKey]bool
unresMutex sync.Mutex
SymName symNameFn
}
// errorUnresolved prints unresolved symbol error for rs that is referenced from s.
func (reporter *ErrorReporter) errorUnresolved(ldr *loader.Loader, s, rs loader.Sym) {
reporter.unresOnce.Do(func() { reporter.unresSyms = make(map[unresolvedSymKey]bool) })
k := unresolvedSymKey{from: s, to: rs}
reporter.unresMutex.Lock()
defer reporter.unresMutex.Unlock()
if !reporter.unresSyms[k] {
reporter.unresSyms[k] = true
name := ldr.SymName(rs)
// Try to find symbol under another ABI.
var reqABI, haveABI obj.ABI
haveABI = ^obj.ABI(0)
reqABI, ok := sym.VersionToABI(ldr.SymVersion(rs))
if ok {
for abi := obj.ABI(0); abi < obj.ABICount; abi++ {
v := sym.ABIToVersion(abi)
if v == -1 {
continue
}
if rs1 := ldr.Lookup(name, v); rs1 != 0 && ldr.SymType(rs1) != sym.Sxxx && ldr.SymType(rs1) != sym.SXREF {
haveABI = abi
}
}
}
// Give a special error message for main symbol (see #24809).
if name == "main.main" {
reporter.Errorf(s, "function main is undeclared in the main package")
} else if haveABI != ^obj.ABI(0) {
reporter.Errorf(s, "relocation target %s not defined for %s (but is defined for %s)", name, reqABI, haveABI)
} else {
reporter.Errorf(s, "relocation target %s not defined", name)
}
}
}
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