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[dev.link] cmd/link/internal/loader: add elf symbol methods

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Add new get/set methods to the loader for recording the ELF symbol
index for a given loader symbol. These are map-based, since it is
expected that many/most symbols will not need an ELF symbol table
entry.

Change-Id: I1102c3637775515ccc6650118e8b059468a2c3ea
Reviewed-on: https://go-review.googlesource.com/c/go/+/230461
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Than McIntosh 2020-04-28 10:37:33 -04:00
parent 183d25d996
commit 12b11f3af9
1 changed files with 49 additions and 9 deletions
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58
src/cmd/link/internal/loader/loader.go
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@ -255,15 +255,17 @@ type Loader struct {
align map[Sym]int32 // stores alignment for symbols
dynimplib map[Sym]string // stores Dynimplib symbol attribute
dynimpvers map[Sym]string // stores Dynimpvers symbol attribute
localentry map[Sym]uint8 // stores Localentry symbol attribute
extname map[Sym]string // stores Extname symbol attribute
elfType map[Sym]elf.SymType // stores elf type symbol property
symPkg map[Sym]string // stores package for symbol, or library for shlib-derived syms
plt map[Sym]int32 // stores dynimport for pe objects
got map[Sym]int32 // stores got for pe objects
dynid map[Sym]int32 // stores Dynid for symbol
dynimplib map[Sym]string // stores Dynimplib symbol attribute
dynimpvers map[Sym]string // stores Dynimpvers symbol attribute
localentry map[Sym]uint8 // stores Localentry symbol attribute
extname map[Sym]string // stores Extname symbol attribute
elfType map[Sym]elf.SymType // stores elf type symbol property
elfSym map[Sym]int32 // stores elf sym symbol property
localElfSym map[Sym]int32 // stores "local" elf sym symbol property
symPkg map[Sym]string // stores package for symbol, or library for shlib-derived syms
plt map[Sym]int32 // stores dynimport for pe objects
got map[Sym]int32 // stores got for pe objects
dynid map[Sym]int32 // stores Dynid for symbol
relocVariant map[relocId]sym.RelocVariant // stores variant relocs
@ -331,6 +333,8 @@ func NewLoader(flags uint32, elfsetstring elfsetstringFunc, reporter *ErrorRepor
extname: make(map[Sym]string),
attrReadOnly: make(map[Sym]bool),
elfType: make(map[Sym]elf.SymType),
elfSym: make(map[Sym]int32),
localElfSym: make(map[Sym]int32),
symPkg: make(map[Sym]string),
plt: make(map[Sym]int32),
got: make(map[Sym]int32),
@ -1235,6 +1239,42 @@ func (l *Loader) SetSymElfType(i Sym, et elf.SymType) {
}
}
// SymElfSym returns the ELF symbol index for a given loader
// symbol, assigned during ELF symtab generation.
func (l *Loader) SymElfSym(i Sym) int32 {
return l.elfSym[i]
}
// SetSymElfSym sets the elf symbol index for a symbol.
func (l *Loader) SetSymElfSym(i Sym, es int32) {
if i == 0 {
panic("bad sym index")
}
if es == 0 {
delete(l.elfSym, i)
} else {
l.elfSym[i] = es
}
}
// SymLocalElfSym returns the "local" ELF symbol index for a given loader
// symbol, assigned during ELF symtab generation.
func (l *Loader) SymLocalElfSym(i Sym) int32 {
return l.localElfSym[i]
}
// SetSymLocalElfSym sets the "local" elf symbol index for a symbol.
func (l *Loader) SetSymLocalElfSym(i Sym, es int32) {
if i == 0 {
panic("bad sym index")
}
if es == 0 {
delete(l.localElfSym, i)
} else {
l.localElfSym[i] = es
}
}
// SymPlt returns the plt value for pe symbols.
func (l *Loader) SymPlt(s Sym) int32 {
if v, ok := l.plt[s]; ok {