loader

package standard library
go1.15.6 Latest Latest
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 Go to latest Published: Dec 3, 2020 License: BSD-3-Clause Imports: 15 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// Loader.flags
	FlagStrictDups = 1 << iota
)

Variables

This section is empty.

Functions

func GenAddAddrPlusFunc added in go1.15 

func GenAddAddrPlusFunc(internalExec bool) func(s *SymbolBuilder, arch *sys.Arch, tgt Sym, add int64) int64

GenAddAddrPlusFunc returns a function to be called when capturing a function symbol's address. In later stages of the link (when address assignment is done) when doing internal linking and targeting an executable, we can just emit the address of a function directly instead of generating a relocation. Clients can call this function (setting 'internalExec' based on build mode and target) and then invoke the returned function in roughly the same way that loader.*SymbolBuilder.AddAddrPlus would be used.

Types

type Aux2 added in go1.15 

type Aux2 struct {
	*goobj2.Aux
	// contains filtered or unexported fields
}

Aux2 holds a "handle" to access an aux symbol record from an object file.

func (Aux2) Sym added in go1.15 

func (a Aux2) Sym() Sym

type Bitmap added in go1.15 

type Bitmap []uint32

func MakeBitmap added in go1.15 

func MakeBitmap(n int) Bitmap

func (Bitmap) Count added in go1.15 

func (bm Bitmap) Count() int

return the number of bits set.

func (Bitmap) Has added in go1.15 

func (bm Bitmap) Has(i Sym) bool

whether the i-th bit is set.

func (Bitmap) Len added in go1.15 

func (bm Bitmap) Len() int

return current length of bitmap in bits.

func (Bitmap) Set added in go1.15 

func (bm Bitmap) Set(i Sym)

set the i-th bit.

func (Bitmap) Unset added in go1.15 

func (bm Bitmap) Unset(i Sym)

unset the i-th bit.

type ErrorReporter added in go1.15 

type ErrorReporter struct {
	AfterErrorAction func()
	// contains filtered or unexported fields
}

ErrorReporter is a helper class for reporting errors.

func (*ErrorReporter) Errorf added in go1.15 

func (reporter *ErrorReporter) Errorf(s Sym, format string, args ...interface{})

Errorf method logs an error message.

After each error, the error actions function will be invoked; this will either terminate the link immediately (if -h option given) or it will keep a count and exit if more than 20 errors have been printed.

Logging an error means that on exit cmd/link will delete any output file and return a non-zero error code.

type ExtReloc added in go1.15 

type ExtReloc struct {
	Idx  int // index of the original relocation
	Xsym Sym
	Xadd int64
}

ExtReloc contains the payload for an external relocation.

type ExtRelocView added in go1.15 

type ExtRelocView struct {
	Reloc2
	*ExtReloc
}

ExtRelocView is a view of an external relocation. It is intended to be constructed on the fly, such as ExtRelocs.At. It is not the data structure used to store the payload internally.

type ExtRelocs added in go1.15 

type ExtRelocs struct {
	// contains filtered or unexported fields
}

ExtRelocs represents the set of external relocations of a symbol.

func (ExtRelocs) At added in go1.15 

func (ers ExtRelocs) At(j int) ExtRelocView

func (ExtRelocs) Count added in go1.15 

func (ers ExtRelocs) Count() int

type FuncInfo added in go1.15 

type FuncInfo struct {
	// contains filtered or unexported fields
}

FuncInfo provides hooks to access goobj2.FuncInfo in the objects.

func (*FuncInfo) Args added in go1.15 

func (fi *FuncInfo) Args() int

func (*FuncInfo) File added in go1.15 

func (fi *FuncInfo) File(k int) Sym

func (*FuncInfo) Funcdata added in go1.15 

func (fi *FuncInfo) Funcdata(syms []Sym) []Sym

func (*FuncInfo) Funcdataoff added in go1.15 

func (fi *FuncInfo) Funcdataoff(k int) int64

func (*FuncInfo) InlTree added in go1.15 

func (fi *FuncInfo) InlTree(k int) InlTreeNode

func (*FuncInfo) Locals added in go1.15 

func (fi *FuncInfo) Locals() int

func (*FuncInfo) NumFile added in go1.15 

func (fi *FuncInfo) NumFile() uint32

func (*FuncInfo) NumFuncdataoff added in go1.15 

func (fi *FuncInfo) NumFuncdataoff() uint32

func (*FuncInfo) NumInlTree added in go1.15 

func (fi *FuncInfo) NumInlTree() uint32

func (*FuncInfo) NumPcdata added in go1.15 

func (fi *FuncInfo) NumPcdata() uint32

func (*FuncInfo) Pcdata added in go1.15 

func (fi *FuncInfo) Pcdata(k int) []byte

func (*FuncInfo) Pcfile added in go1.15 

func (fi *FuncInfo) Pcfile() []byte

func (*FuncInfo) Pcinline added in go1.15 

func (fi *FuncInfo) Pcinline() []byte

func (*FuncInfo) Pcline added in go1.15 

func (fi *FuncInfo) Pcline() []byte

func (*FuncInfo) Pcsp added in go1.15 

func (fi *FuncInfo) Pcsp() []byte

func (*FuncInfo) Preload added in go1.15 

func (fi *FuncInfo) Preload()

Preload has to be called prior to invoking the various methods below related to pcdata, funcdataoff, files, and inltree nodes.

func (*FuncInfo) Valid added in go1.15 

func (fi *FuncInfo) Valid() bool

type InlTreeNode added in go1.15 

type InlTreeNode struct {
	Parent   int32
	File     Sym
	Line     int32
	Func     Sym
	ParentPC int32
}

type Loader 

type Loader struct {
	Syms []*sym.Symbol // indexed symbols. XXX we still make sym.Symbol for now.

	// Used to implement field tracking; created during deadcode if
	// field tracking is enabled. Reachparent[K] contains the index of
	// the symbol that triggered the marking of symbol K as live.
	Reachparent []Sym

	SymLookup func(name string, ver int) *sym.Symbol
	// contains filtered or unexported fields
}

A Loader loads new object files and resolves indexed symbol references.

Notes on the layout of global symbol index space:

  • Go object files are read before host object files; each Go object read adds its defined package symbols to the global index space. Nonpackage symbols are not yet added.
  • In loader.LoadNonpkgSyms, add non-package defined symbols and references in all object files to the global index space.
  • Host object file loading happens; the host object loader does a name/version lookup for each symbol it finds; this can wind up extending the external symbol index space range. The host object loader stores symbol payloads in loader.payloads using SymbolBuilder.
  • For now, in loader.LoadFull we convert all symbols (Go + external) to sym.Symbols.
  • At some point (when the wayfront is pushed through all of the linker), all external symbols will be payload-based, and we can get rid of the loader.Syms array.
  • Each symbol gets a unique global index. For duplicated and overwriting/overwritten symbols, the second (or later) appearance of the symbol gets the same global index as the first appearance.

func NewLoader 

func NewLoader(flags uint32, elfsetstring elfsetstringFunc, reporter *ErrorReporter) *Loader

func (*Loader) AddSym 

func (l *Loader) AddSym(name string, ver int, r *oReader, li int, kind int, dupok bool, typ sym.SymKind) (Sym, bool)

Add a symbol from an object file, return the global index and whether it is added. If the symbol already exist, it returns the index of that symbol.

func (*Loader) AddToSymValue added in go1.15 

func (l *Loader) AddToSymValue(i Sym, val int64)

AddToSymValue adds to the value of the i-th symbol. i is the global index.

func (*Loader) AssignTextSymbolOrder added in go1.15 

func (l *Loader) AssignTextSymbolOrder(libs []*sym.Library, intlibs []bool, extsyms []Sym) []Sym

AssignTextSymbolOrder populates the Textp2 slices within each library and compilation unit, insuring that packages are laid down in dependency order (internal first, then everything else). Return value is a slice of all text syms.

func (*Loader) AttrCgoExport added in go1.15 

func (l *Loader) AttrCgoExport(i Sym) bool

func (*Loader) AttrCgoExportDynamic added in go1.15 

func (l *Loader) AttrCgoExportDynamic(i Sym) bool

AttrCgoExportDynamic returns true for a symbol that has been specially marked via the "cgo_export_dynamic" compiler directive written by cgo (in response to //export directives in the source).

func (*Loader) AttrCgoExportStatic added in go1.15 

func (l *Loader) AttrCgoExportStatic(i Sym) bool

AttrCgoExportStatic returns true for a symbol that has been specially marked via the "cgo_export_static" directive written by cgo.

func (*Loader) AttrDuplicateOK added in go1.15 

func (l *Loader) AttrDuplicateOK(i Sym) bool

AttrDuplicateOK returns true for a symbol that can be present in multiple object files.

func (*Loader) AttrExternal added in go1.15 

func (l *Loader) AttrExternal(i Sym) bool

AttrExternal returns true for function symbols loaded from host object files.

func (*Loader) AttrLocal added in go1.15 

func (l *Loader) AttrLocal(i Sym) bool

AttrLocal returns true for symbols that are only visible within the module (executable or shared library) being linked. This attribute is applied to thunks and certain other linker-generated symbols.

func (*Loader) AttrNotInSymbolTable added in go1.15 

func (l *Loader) AttrNotInSymbolTable(i Sym) bool

AttrNotInSymbolTable returns true for symbols that should not be added to the symbol table of the final generated load module.

func (*Loader) AttrOnList added in go1.15 

func (l *Loader) AttrOnList(i Sym) bool

AttrOnList returns true for symbols that are on some list (such as the list of all text symbols, or one of the lists of data symbols) and is consulted to avoid bugs where a symbol is put on a list twice.

func (*Loader) AttrReachable added in go1.15 

func (l *Loader) AttrReachable(i Sym) bool

AttrReachable returns true for symbols that are transitively referenced from the entry points. Unreachable symbols are not written to the output.

func (*Loader) AttrReadOnly added in go1.15 

func (l *Loader) AttrReadOnly(i Sym) bool

AttrReadOnly returns true for a symbol whose underlying data is stored via a read-only mmap.

func (*Loader) AttrShared added in go1.15 

func (l *Loader) AttrShared(i Sym) bool

AttrShared returns true for symbols compiled with the -shared option.

func (*Loader) AttrSpecial added in go1.15 

func (l *Loader) AttrSpecial(i Sym) bool

AttrSpecial returns true for a symbols that do not have their address (i.e. Value) computed by the usual mechanism of data.go:dodata() & data.go:address().

func (*Loader) AttrSubSymbol added in go1.15 

func (l *Loader) AttrSubSymbol(i Sym) bool

func (*Loader) AttrTopFrame added in go1.15 

func (l *Loader) AttrTopFrame(i Sym) bool

AttrTopFrame returns true for a function symbol that is an entry point, meaning that unwinders should stop when they hit this function.

func (*Loader) AttrVisibilityHidden added in go1.15 

func (l *Loader) AttrVisibilityHidden(i Sym) bool

AttrVisibilityHidden symbols returns true for ELF symbols with visibility set to STV_HIDDEN. They become local symbols in the final executable. Only relevant when internally linking on an ELF platform.

func (*Loader) Aux2 added in go1.15 

func (l *Loader) Aux2(i Sym, j int) Aux2

Returns the "handle" to the j-th aux symbol of the i-th symbol.

func (*Loader) CopyAttributes added in go1.15 

func (l *Loader) CopyAttributes(src Sym, dst Sym)

CopyAttributes copies over all of the attributes of symbol 'src' to symbol 'dst'.

func (*Loader) CopySym added in go1.15 

func (l *Loader) CopySym(src, dst Sym)

Copy the payload of symbol src to dst. Both src and dst must be external symbols. The intended use case is that when building/linking against a shared library, where we do symbol name mangling, the Go object file may have reference to the original symbol name whereas the shared library provides a symbol with the mangled name. When we do mangling, we copy payload of mangled to original.

func (*Loader) CreateExtSym added in go1.15 

func (l *Loader) CreateExtSym(name string, ver int) Sym

CreateExtSym creates a new external symbol with the specified name without adding it to any lookup tables, returning a Sym index for it.

func (*Loader) CreateStaticSym added in go1.15 

func (l *Loader) CreateStaticSym(name string) Sym

CreateStaticSym creates a new static symbol with the specified name without adding it to any lookup tables, returning a Sym index for it.

func (*Loader) CreateSymForUpdate added in go1.15 

func (l *Loader) CreateSymForUpdate(name string, version int) *SymbolBuilder

CreateSymForUpdate creates a symbol with given name and version, returns a CreateSymForUpdate for update. If the symbol already exists, it will update in-place.

func (*Loader) Data 

func (l *Loader) Data(i Sym) []byte

Returns the symbol content of the i-th symbol. i is global index.

func (*Loader) Dump 

func (l *Loader) Dump()

For debugging.

func (*Loader) DynidSyms added in go1.15 

func (l *Loader) DynidSyms() []Sym

DynIdSyms returns the set of symbols for which dynID is set to an interesting (non-default) value. This is expected to be a fairly small set.

func (*Loader) Errorf added in go1.15 

func (l *Loader) Errorf(s Sym, format string, args ...interface{})

Errorf method logs an error message. See ErrorReporter.Errorf for details.

func (*Loader) ExtRelocs added in go1.15 

func (l *Loader) ExtRelocs(i Sym) ExtRelocs

ExtRelocs returns the external relocations of the i-th symbol.

func (*Loader) ExtractSymbols 

func (l *Loader) ExtractSymbols(syms *sym.Symbols)

ExtractSymbols grabs the symbols out of the loader for work that hasn't been ported to the new symbol type.

func (*Loader) FreeSym added in go1.15 

func (l *Loader) FreeSym(i Sym)

func (*Loader) FuncInfo added in go1.15 

func (l *Loader) FuncInfo(i Sym) FuncInfo

func (*Loader) GetErrorReporter added in go1.15 

func (l *Loader) GetErrorReporter() *ErrorReporter

GetErrorReporter returns the loader's associated error reporter.

func (*Loader) GetFuncDwarfAuxSyms added in go1.15 

func (l *Loader) GetFuncDwarfAuxSyms(fnSymIdx Sym) (auxDwarfInfo, auxDwarfLoc, auxDwarfRanges, auxDwarfLines Sym)

GetFuncDwarfAuxSyms collects and returns the auxiliary DWARF symbols associated with a given function symbol. Prior to the introduction of the loader, this was done purely using name lookups, e.f. for function with name XYZ we would then look up go.info.XYZ, etc. FIXME: once all of dwarfgen is converted over to the loader, it would save some space to make these aux symbols nameless.

func (*Loader) InitExtRelocs added in go1.15 

func (l *Loader) InitExtRelocs()

InitExtRelocs initialize the slice used to store external relocations.

func (*Loader) InitOutData added in go1.15 

func (l *Loader) InitOutData()

InitOutData initializes the slice used to store symbol output data.

func (*Loader) InitReachable 

func (l *Loader) InitReachable()

Initialize Reachable bitmap and its siblings for running deadcode pass.

func (*Loader) IsDeferReturnTramp added in go1.15 

func (l *Loader) IsDeferReturnTramp(i Sym) bool

Return whether this is a trampoline of a deferreturn call.

func (*Loader) IsExternal 

func (l *Loader) IsExternal(i Sym) bool

func (*Loader) IsGoType 

func (l *Loader) IsGoType(i Sym) bool

Returns whether this is a Go type symbol. 

func (l *Loader) IsItabLink(i Sym) bool

Returns whether this is a "go.itablink.*" symbol.

func (*Loader) IsNoSplit added in go1.15 

func (l *Loader) IsNoSplit(i Sym) bool

Returns whether the i-th symbol is nosplit.

func (*Loader) IsReflectMethod 

func (l *Loader) IsReflectMethod(i Sym) bool

Returns whether the i-th symbol has ReflectMethod attribute set. 

func (l *Loader) IsTypelink(i Sym) bool

Returns whether this symbol should be included in typelink.

func (*Loader) LoadFull 

func (l *Loader) LoadFull(arch *sys.Arch, syms *sym.Symbols, needReloc, needExtReloc bool)

Load full contents.

func (*Loader) LoadNonpkgSyms added in go1.15 

func (l *Loader) LoadNonpkgSyms(arch *sys.Arch)

Add non-package symbols and references to external symbols (which are always named).

func (*Loader) Lookup 

func (l *Loader) Lookup(name string, ver int) Sym

Look up a symbol by name, return global index, or 0 if not found. This is more like Syms.ROLookup than Lookup -- it doesn't create new symbol.

func (*Loader) LookupOrCreateSym added in go1.15 

func (l *Loader) LookupOrCreateSym(name string, ver int) Sym

LookupOrCreateSym looks up the symbol with the specified name/version, returning its Sym index if found. If the lookup fails, a new external Sym will be created, entered into the lookup tables, and returned.

func (*Loader) MakeSymbolBuilder added in go1.15 

func (l *Loader) MakeSymbolBuilder(name string) *SymbolBuilder

MakeSymbolBuilder creates a symbol builder for use in constructing an entirely new symbol.

func (*Loader) MakeSymbolUpdater added in go1.15 

func (l *Loader) MakeSymbolUpdater(symIdx Sym) *SymbolBuilder

MakeSymbolUpdater creates a symbol builder helper for an existing symbol 'symIdx'. If 'symIdx' is not an external symbol, then create a clone of it (copy name, properties, etc) fix things up so that the lookup tables and caches point to the new version, not the old version.

func (*Loader) NAux 

func (l *Loader) NAux(i Sym) int

Returns the number of aux symbols given a global index.

func (*Loader) NDef 

func (l *Loader) NDef() int

Number of defined Go symbols.

func (*Loader) NReachableSym added in go1.15 

func (l *Loader) NReachableSym() int

Number of reachable symbols.

func (*Loader) NStrictDupMsgs 

func (l *Loader) NStrictDupMsgs() int

func (*Loader) NSym 

func (l *Loader) NSym() int

Number of total symbols.

func (*Loader) NewSection added in go1.15 

func (l *Loader) NewSection() *sym.Section

NewSection creates a new (output) section.

func (*Loader) OutData added in go1.15 

func (l *Loader) OutData(i Sym) []byte

Returns the data of the i-th symbol in the output buffer.

func (*Loader) OuterSym 

func (l *Loader) OuterSym(i Sym) Sym

OuterSym gets the outer symbol for host object loaded symbols.

func (*Loader) Preload 

func (l *Loader) Preload(syms *sym.Symbols, f *bio.Reader, lib *sym.Library, unit *sym.CompilationUnit, length int64) goobj2.FingerprintType

Preload a package: add autolibs, add defined package symbols to the symbol table. Does not add non-package symbols yet, which will be done in LoadNonpkgSyms. Does not read symbol data. Returns the fingerprint of the object.

func (*Loader) PrependSub added in go1.15 

func (l *Loader) PrependSub(outer Sym, sub Sym)

PrependSub prepends 'sub' onto the sub list for outer symbol 'outer'. Will panic if 'sub' already has an outer sym or sub sym. FIXME: should this be instead a method on SymbolBuilder?

func (*Loader) PropagateLoaderChangesToSymbols added in go1.15 

func (l *Loader) PropagateLoaderChangesToSymbols(toconvert []Sym, anonVerReplacement int) []*sym.Symbol

func (*Loader) PropagateSymbolChangesBackToLoader added in go1.15 

func (l *Loader) PropagateSymbolChangesBackToLoader()

PropagateSymbolChangesBackToLoader is a temporary shim function that copies over a given sym.Symbol into the equivalent representation in the loader world. The intent is to enable converting a given linker phase/pass from dealing with sym.Symbol's to a modernized pass that works with loader.Sym, in cases where the "loader.Sym wavefront" has not yet reached the pass in question. For such work the recipe is to first call PropagateSymbolChangesBackToLoader(), then exexute the pass working with the loader, then call PropagateLoaderChangesToSymbols to copy the changes made by the pass back to the sym.Symbol world.

func (*Loader) RawSymName 

func (l *Loader) RawSymName(i Sym) string

Returns the raw (unpatched) name of the i-th symbol.

func (*Loader) RelocVariant added in go1.15 

func (l *Loader) RelocVariant(s Sym, ri int) sym.RelocVariant

RelocVariant returns the 'variant' property of a relocation on some specific symbol.

func (*Loader) Relocs 

func (l *Loader) Relocs(i Sym) Relocs

Relocs returns a Relocs object for the given global sym.

func (*Loader) ResolveABIAlias added in go1.15 

func (l *Loader) ResolveABIAlias(s Sym) Sym

ResolveABIAlias given a symbol returns the ABI alias target of that symbol. If the sym in question is not an alias, the sym itself is returned.

func (*Loader) SetAttrCgoExportDynamic added in go1.15 

func (l *Loader) SetAttrCgoExportDynamic(i Sym, v bool)

SetAttrCgoExportDynamic sets the "cgo_export_dynamic" for a symbol (see AttrCgoExportDynamic).

func (*Loader) SetAttrCgoExportStatic added in go1.15 

func (l *Loader) SetAttrCgoExportStatic(i Sym, v bool)

SetAttrCgoExportStatic sets the "cgo_export_static" for a symbol (see AttrCgoExportStatic).

func (*Loader) SetAttrDuplicateOK added in go1.15 

func (l *Loader) SetAttrDuplicateOK(i Sym, v bool)

SetAttrDuplicateOK sets the "duplicate OK" property for an external symbol (see AttrDuplicateOK).

func (*Loader) SetAttrExternal added in go1.15 

func (l *Loader) SetAttrExternal(i Sym, v bool)

SetAttrExternal sets the "external" property for an host object symbol (see AttrExternal).

func (*Loader) SetAttrLocal added in go1.15 

func (l *Loader) SetAttrLocal(i Sym, v bool)

SetAttrLocal the "local" property for a symbol (see AttrLocal above).

func (*Loader) SetAttrNotInSymbolTable added in go1.15 

func (l *Loader) SetAttrNotInSymbolTable(i Sym, v bool)

SetAttrNotInSymbolTable the "not in symtab" property for a symbol (see AttrNotInSymbolTable above).

func (*Loader) SetAttrOnList added in go1.15 

func (l *Loader) SetAttrOnList(i Sym, v bool)

SetAttrOnList sets the "on list" property for a symbol (see AttrOnList).

func (*Loader) SetAttrReachable added in go1.15 

func (l *Loader) SetAttrReachable(i Sym, v bool)

SetAttrReachable sets the reachability property for a symbol (see AttrReachable).

func (*Loader) SetAttrReadOnly added in go1.15 

func (l *Loader) SetAttrReadOnly(i Sym, v bool)

SetAttrReadOnly sets the "data is read only" property for a symbol (see AttrReadOnly).

func (*Loader) SetAttrShared added in go1.15 

func (l *Loader) SetAttrShared(i Sym, v bool)

SetAttrShared sets the "shared" property for an external symbol (see AttrShared).

func (*Loader) SetAttrSpecial added in go1.15 

func (l *Loader) SetAttrSpecial(i Sym, v bool)

SetAttrSpecial sets the "special" property for a symbol (see AttrSpecial).

func (*Loader) SetAttrTopFrame added in go1.15 

func (l *Loader) SetAttrTopFrame(i Sym, v bool)

SetAttrTopFrame sets the "top frame" property for a symbol (see AttrTopFrame).

func (*Loader) SetAttrVisibilityHidden added in go1.15 

func (l *Loader) SetAttrVisibilityHidden(i Sym, v bool)

SetAttrVisibilityHidden sets the "hidden visibility" property for a symbol (see AttrVisibilityHidden).

func (*Loader) SetExtRelocs added in go1.15 

func (l *Loader) SetExtRelocs(i Sym, relocs []ExtReloc)

SetExtRelocs sets the external relocations of the i-th symbol. i is global index.

func (*Loader) SetGot added in go1.15 

func (l *Loader) SetGot(i Sym, v int32)

SetGot sets the got value for pe symbols.

func (*Loader) SetIsDeferReturnTramp added in go1.15 

func (l *Loader) SetIsDeferReturnTramp(i Sym, v bool)

Set that i is a trampoline of a deferreturn call.

func (*Loader) SetOutData added in go1.15 

func (l *Loader) SetOutData(i Sym, data []byte)

SetOutData sets the position of the data of the i-th symbol in the output buffer. i is global index.

func (*Loader) SetOuterSym added in go1.15 

func (l *Loader) SetOuterSym(i Sym, o Sym)

SetOuterSym sets the outer symbol of i to o (without setting sub symbols).

func (*Loader) SetPlt added in go1.15 

func (l *Loader) SetPlt(i Sym, v int32)

SetPlt sets the plt value for pe symbols.

func (*Loader) SetRelocVariant added in go1.15 

func (l *Loader) SetRelocVariant(s Sym, ri int, v sym.RelocVariant)

SetRelocVariant sets the 'variant' property of a relocation on some specific symbol.

func (*Loader) SetSymAlign added in go1.15 

func (l *Loader) SetSymAlign(i Sym, align int32)

SetSymAlign sets the alignment for a symbol.

func (*Loader) SetSymDynid added in go1.15 

func (l *Loader) SetSymDynid(i Sym, val int32)

SetSymDynid sets the "dynid" property for a symbol.

func (*Loader) SetSymDynimplib added in go1.15 

func (l *Loader) SetSymDynimplib(i Sym, value string)

SetSymDynimplib sets the "dynimplib" attribute for a symbol.

func (*Loader) SetSymDynimpvers added in go1.15 

func (l *Loader) SetSymDynimpvers(i Sym, value string)

SetSymDynimpvers sets the "dynimpvers" attribute for a symbol.

func (*Loader) SetSymElfSym added in go1.15 

func (l *Loader) SetSymElfSym(i Sym, es int32)

SetSymElfSym sets the elf symbol index for a symbol.

func (*Loader) SetSymElfType added in go1.15 

func (l *Loader) SetSymElfType(i Sym, et elf.SymType)

SetSymElfType sets the elf type attribute for a symbol.

func (*Loader) SetSymExtname added in go1.15 

func (l *Loader) SetSymExtname(i Sym, value string)

SetSymExtname sets the "extname" attribute for a symbol.

func (*Loader) SetSymLocalElfSym added in go1.15 

func (l *Loader) SetSymLocalElfSym(i Sym, es int32)

SetSymLocalElfSym sets the "local" elf symbol index for a symbol.

func (*Loader) SetSymLocalentry added in go1.15 

func (l *Loader) SetSymLocalentry(i Sym, value uint8)

SetSymLocalentry sets the "local entry" attribute for a symbol.

func (*Loader) SetSymPkg added in go1.15 

func (l *Loader) SetSymPkg(i Sym, pkg string)

SetSymPkg sets the package/library for a symbol. This is needed mainly for external symbols, specifically those imported from shared libraries.

func (*Loader) SetSymSect added in go1.15 

func (l *Loader) SetSymSect(i Sym, sect *sym.Section)

SetSymValue sets the section of the i-th symbol. i is global index.

func (*Loader) SetSymValue added in go1.15 

func (l *Loader) SetSymValue(i Sym, val int64)

SetSymValue sets the value of the i-th symbol. i is global index.

func (*Loader) SortSub added in go1.15 

func (l *Loader) SortSub(s Sym) Sym

SortSub walks through the sub-symbols for 's' and sorts them in place by increasing value. Return value is the new sub symbol for the specified outer symbol.

func (*Loader) SubSym 

func (l *Loader) SubSym(i Sym) Sym

SubSym gets the subsymbol for host object loaded symbols.

func (*Loader) SymAddr added in go1.15 

func (l *Loader) SymAddr(i Sym) int64

SymAddr checks that a symbol is reachable, and returns its value.

func (*Loader) SymAlign added in go1.15 

func (l *Loader) SymAlign(i Sym) int32

SymAlign returns the alignment for a symbol.

func (*Loader) SymAttr 

func (l *Loader) SymAttr(i Sym) uint8

Returns the attributes of the i-th symbol.

func (*Loader) SymDynid added in go1.15 

func (l *Loader) SymDynid(i Sym) int32

SymDynid returns the "dynid" property for the specified symbol.

func (*Loader) SymDynimplib added in go1.15 

func (l *Loader) SymDynimplib(i Sym) string

SymDynImplib returns the "dynimplib" attribute for the specified symbol, making up a portion of the info for a symbol specified on a "cgo_import_dynamic" compiler directive.

func (*Loader) SymDynimpvers added in go1.15 

func (l *Loader) SymDynimpvers(i Sym) string

SymDynimpvers returns the "dynimpvers" attribute for the specified symbol, making up a portion of the info for a symbol specified on a "cgo_import_dynamic" compiler directive.

func (*Loader) SymElfSym added in go1.15 

func (l *Loader) SymElfSym(i Sym) int32

SymElfSym returns the ELF symbol index for a given loader symbol, assigned during ELF symtab generation.

func (*Loader) SymElfType added in go1.15 

func (l *Loader) SymElfType(i Sym) elf.SymType

SymElfType returns the previously recorded ELF type for a symbol (used only for symbols read from shared libraries by ldshlibsyms). It is not set for symbols defined by the packages being linked or by symbols read by ldelf (and so is left as elf.STT_NOTYPE).

func (*Loader) SymExtname added in go1.15 

func (l *Loader) SymExtname(i Sym) string

SymExtname returns the "extname" value for the specified symbol.

func (*Loader) SymGoType added in go1.15 

func (l *Loader) SymGoType(i Sym) Sym

SymGoType returns the 'Gotype' property for a given symbol (set by the Go compiler for variable symbols). This version relies on reading aux symbols for the target sym -- it could be that a faster approach would be to check for gotype during preload and copy the results in to a map (might want to try this at some point and see if it helps speed things up).

func (*Loader) SymGot added in go1.15 

func (l *Loader) SymGot(s Sym) int32

SymGot returns the got value for pe symbols.

func (*Loader) SymLocalElfSym added in go1.15 

func (l *Loader) SymLocalElfSym(i Sym) int32

SymLocalElfSym returns the "local" ELF symbol index for a given loader symbol, assigned during ELF symtab generation.

func (*Loader) SymLocalentry added in go1.15 

func (l *Loader) SymLocalentry(i Sym) uint8

SymLocalentry returns the "local entry" value for the specified symbol.

func (*Loader) SymName 

func (l *Loader) SymName(i Sym) string

Returns the (patched) name of the i-th symbol.

func (*Loader) SymPkg added in go1.15 

func (l *Loader) SymPkg(i Sym) string

SymPkg returns the package where the symbol came from (for regular compiler-generated Go symbols), but in the case of building with "-linkshared" (when a symbol is read from a shared library), will hold the library name. NOTE: this correspondes to sym.Symbol.File field.

func (*Loader) SymPlt added in go1.15 

func (l *Loader) SymPlt(s Sym) int32

SymPlt returns the plt value for pe symbols.

func (*Loader) SymSect added in go1.15 

func (l *Loader) SymSect(i Sym) *sym.Section

SymValue returns the section of the i-th symbol. i is global index.

func (*Loader) SymSize added in go1.15 

func (l *Loader) SymSize(i Sym) int64

Returns the size of the i-th symbol.

func (*Loader) SymType 

func (l *Loader) SymType(i Sym) sym.SymKind

Returns the type of the i-th symbol.

func (*Loader) SymUnit added in go1.15 

func (l *Loader) SymUnit(i Sym) *sym.CompilationUnit

SymUnit returns the compilation unit for a given symbol (which will typically be nil for external or linker-manufactured symbols).

func (*Loader) SymValue added in go1.15 

func (l *Loader) SymValue(i Sym) int64

SymValue returns the value of the i-th symbol. i is global index.

func (*Loader) SymVersion added in go1.15 

func (l *Loader) SymVersion(i Sym) int

Returns the version of the i-th symbol.

func (*Loader) TopLevelSym added in go1.15 

func (l *Loader) TopLevelSym(s Sym) bool

TopLevelSym tests a symbol (by name and kind) to determine whether the symbol first class sym (participating in the link) or is an anonymous aux or sub-symbol containing some sub-part or payload of another symbol.

func (*Loader) UndefinedRelocTargets added in go1.15 

func (l *Loader) UndefinedRelocTargets(limit int) []Sym

UndefinedRelocTargets iterates through the global symbol index space, looking for symbols with relocations targeting undefined references. The linker's loadlib method uses this to determine if there are unresolved references to functions in system libraries (for example, libgcc.a), presumably due to CGO code. Return value is a list of loader.Sym's corresponding to the undefined cross-refs. The "limit" param controls the maximum number of results returned; if "limit" is -1, then all undefs are returned.

type Reloc 

type Reloc struct {
	Off  int32            // offset to rewrite
	Size uint8            // number of bytes to rewrite: 0, 1, 2, or 4
	Type objabi.RelocType // the relocation type
	Add  int64            // addend
	Sym  Sym              // global index of symbol the reloc addresses
}

Reloc contains the payload for a specific relocation. TODO: replace this with sym.Reloc, once we change the relocation target from "*sym.Symbol" to "loader.Sym" in sym.Reloc.

type Reloc2 added in go1.15 

type Reloc2 struct {
	*goobj2.Reloc
	// contains filtered or unexported fields
}

Reloc2 holds a "handle" to access a relocation record from an object file.

func (Reloc2) SetSym added in go1.15 

func (rel Reloc2) SetSym(s Sym)

func (Reloc2) SetType added in go1.15 

func (rel Reloc2) SetType(t objabi.RelocType)

func (Reloc2) Sym added in go1.15 

func (rel Reloc2) Sym() Sym

func (Reloc2) Type added in go1.15 

func (rel Reloc2) Type() objabi.RelocType

type RelocByOff added in go1.15 

type RelocByOff []Reloc

func (RelocByOff) Len added in go1.15 

func (x RelocByOff) Len() int

func (RelocByOff) Less added in go1.15 

func (x RelocByOff) Less(i, j int) bool

func (RelocByOff) Swap added in go1.15 

func (x RelocByOff) Swap(i, j int)

type Relocs 

type Relocs struct {
	// contains filtered or unexported fields
}

Relocs encapsulates the set of relocations on a given symbol; an instance of this type is returned by the Loader Relocs() method.

func (*Relocs) At2 added in go1.15 

func (relocs *Relocs) At2(j int) Reloc2

At2 returns the j-th reloc for a global symbol.

func (*Relocs) Count 

func (relocs *Relocs) Count() int

type Sym 

type Sym int

Sym encapsulates a global symbol index, used to identify a specific Go symbol. The 0-valued Sym is corresponds to an invalid symbol.

type SymbolBuilder added in go1.15 

type SymbolBuilder struct {
	// contains filtered or unexported fields
}

SymbolBuilder is a helper designed to help with the construction of new symbol contents.

func (*SymbolBuilder) AddAddr added in go1.15 

func (sb *SymbolBuilder) AddAddr(arch *sys.Arch, tgt Sym) int64

func (*SymbolBuilder) AddAddrPlus added in go1.15 

func (sb *SymbolBuilder) AddAddrPlus(arch *sys.Arch, tgt Sym, add int64) int64

func (*SymbolBuilder) AddAddrPlus4 added in go1.15 

func (sb *SymbolBuilder) AddAddrPlus4(arch *sys.Arch, tgt Sym, add int64) int64

func (*SymbolBuilder) AddBytes added in go1.15 

func (sb *SymbolBuilder) AddBytes(data []byte)

func (*SymbolBuilder) AddCURelativeAddrPlus added in go1.15 

func (sb *SymbolBuilder) AddCURelativeAddrPlus(arch *sys.Arch, tgt Sym, add int64) int64

func (*SymbolBuilder) AddPCRelPlus added in go1.15 

func (sb *SymbolBuilder) AddPCRelPlus(arch *sys.Arch, tgt Sym, add int64) int64

func (*SymbolBuilder) AddRel added in go1.15 

func (sb *SymbolBuilder) AddRel(typ objabi.RelocType) (Reloc2, int)

Add a relocation with given type, return its handle and index (to set other fields).

func (*SymbolBuilder) AddReloc added in go1.15 

func (sb *SymbolBuilder) AddReloc(r Reloc) uint32

AddReloc appends the specified reloc to the symbols list of relocations. Return value is the index of the newly created reloc.

func (*SymbolBuilder) AddRelocs added in go1.15 

func (sb *SymbolBuilder) AddRelocs(n int) Relocs

Add n relocations, return a handle to the relocations.

func (*SymbolBuilder) AddSize added in go1.15 

func (sb *SymbolBuilder) AddSize(arch *sys.Arch, tgt Sym) int64

func (*SymbolBuilder) AddSymRef added in go1.15 

func (sb *SymbolBuilder) AddSymRef(arch *sys.Arch, tgt Sym, add int64, typ objabi.RelocType, rsize int) int64

Add a symbol reference (relocation) with given type, addend, and size (the most generic form).

func (*SymbolBuilder) AddUint added in go1.15 

func (sb *SymbolBuilder) AddUint(arch *sys.Arch, v uint64) int64

func (*SymbolBuilder) AddUint16 added in go1.15 

func (sb *SymbolBuilder) AddUint16(arch *sys.Arch, v uint16) int64

func (*SymbolBuilder) AddUint32 added in go1.15 

func (sb *SymbolBuilder) AddUint32(arch *sys.Arch, v uint32) int64

func (*SymbolBuilder) AddUint64 added in go1.15 

func (sb *SymbolBuilder) AddUint64(arch *sys.Arch, v uint64) int64

func (*SymbolBuilder) AddUint8 added in go1.15 

func (sb *SymbolBuilder) AddUint8(v uint8) int64

func (*SymbolBuilder) AddUintXX added in go1.15 

func (sb *SymbolBuilder) AddUintXX(arch *sys.Arch, v uint64, wid int) int64

func (*SymbolBuilder) Addstring added in go1.15 

func (sb *SymbolBuilder) Addstring(str string) int64

func (*SymbolBuilder) Align added in go1.15 

func (sb *SymbolBuilder) Align() int32

func (*SymbolBuilder) CgoExportDynamic added in go1.15 

func (sb *SymbolBuilder) CgoExportDynamic() bool

func (*SymbolBuilder) Data added in go1.15 

func (sb *SymbolBuilder) Data() []byte

func (*SymbolBuilder) DuplicateOK added in go1.15 

func (sb *SymbolBuilder) DuplicateOK() bool

func (*SymbolBuilder) Dynimplib added in go1.15 

func (sb *SymbolBuilder) Dynimplib() string

func (*SymbolBuilder) Dynimpvers added in go1.15 

func (sb *SymbolBuilder) Dynimpvers() string

func (*SymbolBuilder) External added in go1.15 

func (sb *SymbolBuilder) External() bool

func (*SymbolBuilder) Extname added in go1.15 

func (sb *SymbolBuilder) Extname() string

func (*SymbolBuilder) GoType added in go1.15 

func (sb *SymbolBuilder) GoType() Sym

func (SymbolBuilder) Grow added in go1.15 

func (ms SymbolBuilder) Grow(siz int64)

func (*SymbolBuilder) Localentry added in go1.15 

func (sb *SymbolBuilder) Localentry() uint8

func (*SymbolBuilder) MakeWritable added in go1.15 

func (sb *SymbolBuilder) MakeWritable()

func (*SymbolBuilder) Name added in go1.15 

func (sb *SymbolBuilder) Name() string

func (*SymbolBuilder) OnList added in go1.15 

func (sb *SymbolBuilder) OnList() bool

func (*SymbolBuilder) Outer added in go1.15 

func (sb *SymbolBuilder) Outer() Sym

func (*SymbolBuilder) PrependSub added in go1.15 

func (sb *SymbolBuilder) PrependSub(sub Sym)

func (*SymbolBuilder) Reachable added in go1.15 

func (sb *SymbolBuilder) Reachable() bool

func (*SymbolBuilder) ReadOnly added in go1.15 

func (sb *SymbolBuilder) ReadOnly() bool

func (*SymbolBuilder) Relocs added in go1.15 

func (sb *SymbolBuilder) Relocs() Relocs

func (*SymbolBuilder) Sect added in go1.15 

func (sb *SymbolBuilder) Sect() *sym.Section

func (*SymbolBuilder) SetAddr added in go1.15 

func (sb *SymbolBuilder) SetAddr(arch *sys.Arch, off int64, tgt Sym) int64

func (*SymbolBuilder) SetAddrPlus added in go1.15 

func (sb *SymbolBuilder) SetAddrPlus(arch *sys.Arch, off int64, tgt Sym, add int64) int64

func (*SymbolBuilder) SetAlign added in go1.15 

func (sb *SymbolBuilder) SetAlign(align int32)

func (*SymbolBuilder) SetData added in go1.15 

func (sb *SymbolBuilder) SetData(data []byte)

func (*SymbolBuilder) SetDuplicateOK added in go1.15 

func (sb *SymbolBuilder) SetDuplicateOK(v bool)

func (*SymbolBuilder) SetDynimplib added in go1.15 

func (sb *SymbolBuilder) SetDynimplib(value string)

func (*SymbolBuilder) SetDynimpvers added in go1.15 

func (sb *SymbolBuilder) SetDynimpvers(value string)

func (*SymbolBuilder) SetExternal added in go1.15 

func (sb *SymbolBuilder) SetExternal(v bool)

func (*SymbolBuilder) SetExtname added in go1.15 

func (sb *SymbolBuilder) SetExtname(value string)

func (*SymbolBuilder) SetGot added in go1.15 

func (sb *SymbolBuilder) SetGot(value int32)

func (*SymbolBuilder) SetLocal added in go1.15 

func (sb *SymbolBuilder) SetLocal(value bool)

func (*SymbolBuilder) SetLocalentry added in go1.15 

func (sb *SymbolBuilder) SetLocalentry(value uint8)

func (*SymbolBuilder) SetNotInSymbolTable added in go1.15 

func (sb *SymbolBuilder) SetNotInSymbolTable(value bool)

func (*SymbolBuilder) SetOnList added in go1.15 

func (sb *SymbolBuilder) SetOnList(v bool)

func (*SymbolBuilder) SetPlt added in go1.15 

func (sb *SymbolBuilder) SetPlt(value int32)

func (*SymbolBuilder) SetReachable added in go1.15 

func (sb *SymbolBuilder) SetReachable(v bool)

func (*SymbolBuilder) SetReadOnly added in go1.15 

func (sb *SymbolBuilder) SetReadOnly(v bool)

func (*SymbolBuilder) SetReloc added in go1.15 

func (sb *SymbolBuilder) SetReloc(j int, r Reloc)

Update the j-th relocation in place.

func (*SymbolBuilder) SetRelocAdd added in go1.15 

func (sb *SymbolBuilder) SetRelocAdd(i int, a int64)

SetRelocAdd sets the addend of the 'i'-th relocation on this sym to 'a'

func (*SymbolBuilder) SetRelocSym added in go1.15 

func (sb *SymbolBuilder) SetRelocSym(i int, tgt Sym)

SetRelocSym sets the target sym of the 'i'-th relocation on this sym to 's'

func (*SymbolBuilder) SetRelocType added in go1.15 

func (sb *SymbolBuilder) SetRelocType(i int, t objabi.RelocType)

SetRelocType sets the type of the 'i'-th relocation on this sym to 't'

func (*SymbolBuilder) SetRelocs added in go1.15 

func (sb *SymbolBuilder) SetRelocs(rslice []Reloc)

func (*SymbolBuilder) SetSect added in go1.15 

func (sb *SymbolBuilder) SetSect(sect *sym.Section)

func (*SymbolBuilder) SetSize added in go1.15 

func (sb *SymbolBuilder) SetSize(size int64)

func (*SymbolBuilder) SetSpecial added in go1.15 

func (sb *SymbolBuilder) SetSpecial(value bool)

func (*SymbolBuilder) SetType added in go1.15 

func (sb *SymbolBuilder) SetType(kind sym.SymKind)

func (*SymbolBuilder) SetUint added in go1.15 

func (sb *SymbolBuilder) SetUint(arch *sys.Arch, r int64, v uint64) int64

func (*SymbolBuilder) SetUint16 added in go1.15 

func (sb *SymbolBuilder) SetUint16(arch *sys.Arch, r int64, v uint16) int64

func (*SymbolBuilder) SetUint32 added in go1.15 

func (sb *SymbolBuilder) SetUint32(arch *sys.Arch, r int64, v uint32) int64

func (*SymbolBuilder) SetUint8 added in go1.15 

func (sb *SymbolBuilder) SetUint8(arch *sys.Arch, r int64, v uint8) int64

func (*SymbolBuilder) SetValue added in go1.15 

func (sb *SymbolBuilder) SetValue(v int64)

func (*SymbolBuilder) SetVisibilityHidden added in go1.15 

func (sb *SymbolBuilder) SetVisibilityHidden(value bool)

func (*SymbolBuilder) Size added in go1.15 

func (sb *SymbolBuilder) Size() int64

func (*SymbolBuilder) SortRelocs added in go1.15 

func (sb *SymbolBuilder) SortRelocs()

Sort relocations by offset.

func (*SymbolBuilder) SortSub added in go1.15 

func (sb *SymbolBuilder) SortSub()

func (*SymbolBuilder) Sub added in go1.15 

func (sb *SymbolBuilder) Sub() Sym

func (*SymbolBuilder) SubSym added in go1.15 

func (sb *SymbolBuilder) SubSym() Sym

func (*SymbolBuilder) Sym added in go1.15 

func (sb *SymbolBuilder) Sym() Sym

func (*SymbolBuilder) Type added in go1.15 

func (sb *SymbolBuilder) Type() sym.SymKind

func (*SymbolBuilder) Value added in go1.15 

func (sb *SymbolBuilder) Value() int64

func (*SymbolBuilder) Version added in go1.15 

func (sb *SymbolBuilder) Version() int

func (*SymbolBuilder) VisibilityHidden added in go1.15 

func (sb *SymbolBuilder) VisibilityHidden() bool

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