loader

package
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 Go to latest Published: Feb 6, 2021 License: BSD-3-Clause Imports: 15 Imported by: 0

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Index

Constants

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

Variables

This section is empty.

Functions

func GenAddAddrPlusFunc 

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 

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 

func (a Aux2) Sym() Sym

type Bitmap 

type Bitmap []uint32

func MakeBitmap 

func MakeBitmap(n int) Bitmap

func (Bitmap) Count 

func (bm Bitmap) Count() int

return the number of bits set.

func (Bitmap) Has 

func (bm Bitmap) Has(i Sym) bool

whether the i-th bit is set.

func (Bitmap) Len 

func (bm Bitmap) Len() int

return current length of bitmap in bits.

func (Bitmap) Set 

func (bm Bitmap) Set(i Sym)

set the i-th bit.

func (Bitmap) Unset 

func (bm Bitmap) Unset(i Sym)

unset the i-th bit.

type ErrorReporter 

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

ErrorReporter is a helper class for reporting errors.

func (*ErrorReporter) Errorf 

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 

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

ExtReloc contains the payload for an external relocation.

type ExtRelocView 

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 

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

ExtRelocs represents the set of external relocations of a symbol.

func (ExtRelocs) At 

func (ers ExtRelocs) At(j int) ExtRelocView

func (ExtRelocs) Count 

func (ers ExtRelocs) Count() int

type FuncInfo 

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

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

func (*FuncInfo) Args 

func (fi *FuncInfo) Args() int

func (*FuncInfo) File 

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

func (*FuncInfo) Funcdata 

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

func (*FuncInfo) Funcdataoff 

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

func (*FuncInfo) InlTree 

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

func (*FuncInfo) Locals 

func (fi *FuncInfo) Locals() int

func (*FuncInfo) NumFile 

func (fi *FuncInfo) NumFile() uint32

func (*FuncInfo) NumFuncdataoff 

func (fi *FuncInfo) NumFuncdataoff() uint32

func (*FuncInfo) NumInlTree 

func (fi *FuncInfo) NumInlTree() uint32

func (*FuncInfo) NumPcdata 

func (fi *FuncInfo) NumPcdata() uint32

func (*FuncInfo) Pcdata 

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

func (*FuncInfo) Pcfile 

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

func (*FuncInfo) Pcinline 

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

func (*FuncInfo) Pcline 

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

func (*FuncInfo) Pcsp 

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

func (*FuncInfo) Preload 

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 

func (fi *FuncInfo) Valid() bool

type InlTreeNode 

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 

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 

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 

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

func (*Loader) AttrCgoExportDynamic 

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 

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 

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

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

func (*Loader) AttrExternal 

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

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

func (*Loader) AttrLocal 

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 

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 

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 

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 

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 

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

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

func (*Loader) AttrSpecial 

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 

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

func (*Loader) AttrTopFrame 

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 

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 

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 

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

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

func (*Loader) CopySym 

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 

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 

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 

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 

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 

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

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

func (*Loader) ExtRelocs 

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 

func (l *Loader) FreeSym(i Sym)

func (*Loader) FuncInfo 

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

func (*Loader) GetErrorReporter 

func (l *Loader) GetErrorReporter() *ErrorReporter

GetErrorReporter returns the loader's associated error reporter.

func (*Loader) GetFuncDwarfAuxSyms 

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 

func (l *Loader) InitExtRelocs()

InitExtRelocs initialize the slice used to store external relocations.

func (*Loader) InitOutData 

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 

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 

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 

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 

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 

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

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

func (*Loader) MakeSymbolUpdater 

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 

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 

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

NewSection creates a new (output) section.

func (*Loader) OutData 

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 

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 

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

func (*Loader) PropagateSymbolChangesBackToLoader 

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 

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 

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 

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

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

func (*Loader) SetAttrCgoExportStatic 

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

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

func (*Loader) SetAttrDuplicateOK 

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

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

func (*Loader) SetAttrExternal 

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

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

func (*Loader) SetAttrLocal 

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

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

func (*Loader) SetAttrNotInSymbolTable 

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

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

func (*Loader) SetAttrOnList 

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

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

func (*Loader) SetAttrReachable 

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

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

func (*Loader) SetAttrReadOnly 

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

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

func (*Loader) SetAttrShared 

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

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

func (*Loader) SetAttrSpecial 

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

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

func (*Loader) SetAttrTopFrame 

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

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

func (*Loader) SetAttrVisibilityHidden 

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

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

func (*Loader) SetExtRelocs 

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 

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

SetGot sets the got value for pe symbols.

func (*Loader) SetIsDeferReturnTramp 

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

Set that i is a trampoline of a deferreturn call.

func (*Loader) SetOutData 

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 

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

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

func (*Loader) SetPlt 

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

SetPlt sets the plt value for pe symbols.

func (*Loader) SetRelocVariant 

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 

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

SetSymAlign sets the alignment for a symbol.

func (*Loader) SetSymDynid 

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

SetSymDynid sets the "dynid" property for a symbol.

func (*Loader) SetSymDynimplib 

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

SetSymDynimplib sets the "dynimplib" attribute for a symbol.

func (*Loader) SetSymDynimpvers 

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

SetSymDynimpvers sets the "dynimpvers" attribute for a symbol.

func (*Loader) SetSymElfSym 

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

SetSymElfSym sets the elf symbol index for a symbol.

func (*Loader) SetSymElfType 

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

SetSymElfType sets the elf type attribute for a symbol.

func (*Loader) SetSymExtname 

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

SetSymExtname sets the "extname" attribute for a symbol.

func (*Loader) SetSymLocalElfSym 

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

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

func (*Loader) SetSymLocalentry 

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

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

func (*Loader) SetSymPkg 

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 

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 

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

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

func (*Loader) SortSub 

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 

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

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

func (*Loader) SymAlign 

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 

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

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

func (*Loader) SymDynimplib 

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 

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 

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 

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 

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

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

func (*Loader) SymGoType 

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 

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

SymGot returns the got value for pe symbols.

func (*Loader) SymLocalElfSym 

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 

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 

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 

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

SymPlt returns the plt value for pe symbols.

func (*Loader) SymSect 

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

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

func (*Loader) SymSize 

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 

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 

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

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

func (*Loader) SymVersion 

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

Returns the version of the i-th symbol.

func (*Loader) TopLevelSym 

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 

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 

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 

func (rel Reloc2) SetSym(s Sym)

func (Reloc2) SetType 

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

func (Reloc2) Sym 

func (rel Reloc2) Sym() Sym

func (Reloc2) Type 

func (rel Reloc2) Type() objabi.RelocType

type RelocByOff 

type RelocByOff []Reloc

func (RelocByOff) Len 

func (x RelocByOff) Len() int

func (RelocByOff) Less 

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

func (RelocByOff) Swap 

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 

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 

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 

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

func (*SymbolBuilder) AddAddrPlus 

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

func (*SymbolBuilder) AddAddrPlus4 

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

func (*SymbolBuilder) AddBytes 

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

func (*SymbolBuilder) AddCURelativeAddrPlus 

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

func (*SymbolBuilder) AddPCRelPlus 

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

func (*SymbolBuilder) AddRel 

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 

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 

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

Add n relocations, return a handle to the relocations.

func (*SymbolBuilder) AddSize 

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

func (*SymbolBuilder) AddSymRef 

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 

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

func (*SymbolBuilder) AddUint16 

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

func (*SymbolBuilder) AddUint32 

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

func (*SymbolBuilder) AddUint64 

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

func (*SymbolBuilder) AddUint8 

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

func (*SymbolBuilder) AddUintXX 

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

func (*SymbolBuilder) Addstring 

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

func (*SymbolBuilder) Align 

func (sb *SymbolBuilder) Align() int32

func (*SymbolBuilder) CgoExportDynamic 

func (sb *SymbolBuilder) CgoExportDynamic() bool

func (*SymbolBuilder) Data 

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

func (*SymbolBuilder) DuplicateOK 

func (sb *SymbolBuilder) DuplicateOK() bool

func (*SymbolBuilder) Dynimplib 

func (sb *SymbolBuilder) Dynimplib() string

func (*SymbolBuilder) Dynimpvers 

func (sb *SymbolBuilder) Dynimpvers() string

func (*SymbolBuilder) External 

func (sb *SymbolBuilder) External() bool

func (*SymbolBuilder) Extname 

func (sb *SymbolBuilder) Extname() string

func (*SymbolBuilder) GoType 

func (sb *SymbolBuilder) GoType() Sym

func (SymbolBuilder) Grow 

func (ms SymbolBuilder) Grow(siz int64)

func (*SymbolBuilder) Localentry 

func (sb *SymbolBuilder) Localentry() uint8

func (*SymbolBuilder) MakeWritable 

func (sb *SymbolBuilder) MakeWritable()

func (*SymbolBuilder) Name 

func (sb *SymbolBuilder) Name() string

func (*SymbolBuilder) OnList 

func (sb *SymbolBuilder) OnList() bool

func (*SymbolBuilder) Outer 

func (sb *SymbolBuilder) Outer() Sym

func (*SymbolBuilder) PrependSub 

func (sb *SymbolBuilder) PrependSub(sub Sym)

func (*SymbolBuilder) Reachable 

func (sb *SymbolBuilder) Reachable() bool

func (*SymbolBuilder) ReadOnly 

func (sb *SymbolBuilder) ReadOnly() bool

func (*SymbolBuilder) Relocs 

func (sb *SymbolBuilder) Relocs() Relocs

func (*SymbolBuilder) Sect 

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

func (*SymbolBuilder) SetAddr 

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

func (*SymbolBuilder) SetAddrPlus 

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

func (*SymbolBuilder) SetAlign 

func (sb *SymbolBuilder) SetAlign(align int32)

func (*SymbolBuilder) SetData 

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

func (*SymbolBuilder) SetDuplicateOK 

func (sb *SymbolBuilder) SetDuplicateOK(v bool)

func (*SymbolBuilder) SetDynimplib 

func (sb *SymbolBuilder) SetDynimplib(value string)

func (*SymbolBuilder) SetDynimpvers 

func (sb *SymbolBuilder) SetDynimpvers(value string)

func (*SymbolBuilder) SetExternal 

func (sb *SymbolBuilder) SetExternal(v bool)

func (*SymbolBuilder) SetExtname 

func (sb *SymbolBuilder) SetExtname(value string)

func (*SymbolBuilder) SetGot 

func (sb *SymbolBuilder) SetGot(value int32)

func (*SymbolBuilder) SetLocal 

func (sb *SymbolBuilder) SetLocal(value bool)

func (*SymbolBuilder) SetLocalentry 

func (sb *SymbolBuilder) SetLocalentry(value uint8)

func (*SymbolBuilder) SetNotInSymbolTable 

func (sb *SymbolBuilder) SetNotInSymbolTable(value bool)

func (*SymbolBuilder) SetOnList 

func (sb *SymbolBuilder) SetOnList(v bool)

func (*SymbolBuilder) SetPlt 

func (sb *SymbolBuilder) SetPlt(value int32)

func (*SymbolBuilder) SetReachable 

func (sb *SymbolBuilder) SetReachable(v bool)

func (*SymbolBuilder) SetReadOnly 

func (sb *SymbolBuilder) SetReadOnly(v bool)

func (*SymbolBuilder) SetReloc 

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

Update the j-th relocation in place.

func (*SymbolBuilder) SetRelocAdd 

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 

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 

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 

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

func (*SymbolBuilder) SetSect 

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

func (*SymbolBuilder) SetSize 

func (sb *SymbolBuilder) SetSize(size int64)

func (*SymbolBuilder) SetSpecial 

func (sb *SymbolBuilder) SetSpecial(value bool)

func (*SymbolBuilder) SetType 

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

func (*SymbolBuilder) SetUint 

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

func (*SymbolBuilder) SetUint16 

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

func (*SymbolBuilder) SetUint32 

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

func (*SymbolBuilder) SetUint8 

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

func (*SymbolBuilder) SetValue 

func (sb *SymbolBuilder) SetValue(v int64)

func (*SymbolBuilder) SetVisibilityHidden 

func (sb *SymbolBuilder) SetVisibilityHidden(value bool)

func (*SymbolBuilder) Size 

func (sb *SymbolBuilder) Size() int64

func (*SymbolBuilder) SortRelocs 

func (sb *SymbolBuilder) SortRelocs()

Sort relocations by offset.

func (*SymbolBuilder) SortSub 

func (sb *SymbolBuilder) SortSub()

func (*SymbolBuilder) Sub 

func (sb *SymbolBuilder) Sub() Sym

func (*SymbolBuilder) SubSym 

func (sb *SymbolBuilder) SubSym() Sym

func (*SymbolBuilder) Sym 

func (sb *SymbolBuilder) Sym() Sym

func (*SymbolBuilder) Type 

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

func (*SymbolBuilder) Value 

func (sb *SymbolBuilder) Value() int64

func (*SymbolBuilder) Version 

func (sb *SymbolBuilder) Version() int

func (*SymbolBuilder) VisibilityHidden 

func (sb *SymbolBuilder) VisibilityHidden() bool

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