Package loader
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Constants
const (
// Loader.flags
FlagStrictDups = 1 << iota
FlagCheckLinkname
)
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.
type Aux ¶
Aux holds a "handle" to access an aux symbol record from an object file.
type Aux struct {
*goobj.Aux
// contains filtered or unexported fields
}
func (Aux) Sym ¶
func (a Aux) 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 ¶
ErrorReporter is a helper class for reporting errors.
type ErrorReporter struct {
AfterErrorAction func()
// contains filtered or unexported fields
}
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 ¶
ExtReloc contains the payload for an external relocation.
type ExtReloc struct {
Xsym Sym
Xadd int64
Type objabi.RelocType
Size uint8
}
type FuncInfo ¶
FuncInfo provides hooks to access goobj.FuncInfo in the objects.
type FuncInfo struct {
// contains filtered or unexported fields
}
func (*FuncInfo) Args ¶
func (fi *FuncInfo) Args() int
func (*FuncInfo) File ¶
func (fi *FuncInfo) File(k int) goobj.CUFileIndex
func (*FuncInfo) FuncFlag ¶
func (fi *FuncInfo) FuncFlag() abi.FuncFlag
func (*FuncInfo) FuncID ¶
func (fi *FuncInfo) FuncID() abi.FuncID
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) NumInlTree ¶
func (fi *FuncInfo) NumInlTree() uint32
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) StartLine ¶
func (fi *FuncInfo) StartLine() int32
func (*FuncInfo) TopFrame ¶
func (fi *FuncInfo) TopFrame() bool
TopFrame returns true if the function associated with this FuncInfo is an entry point, meaning that unwinders should stop when they hit this function.
func (*FuncInfo) Valid ¶
func (fi *FuncInfo) Valid() bool
type InlTreeNode ¶
type InlTreeNode struct {
Parent int32
File goobj.CUFileIndex
Line int32
Func Sym
ParentPC int32
}
type Loader ¶
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.
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.
type Loader struct {
// 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
// CgoExports records cgo-exported symbols by SymName.
CgoExports map[string]Sym
// contains filtered or unexported fields
}
func NewLoader ¶
func NewLoader(flags uint32, reporter *ErrorReporter) *Loader
func (*Loader) AddCgoExport ¶
func (l *Loader) AddCgoExport(s Sym)
AddCgoExport records a cgo-exported symbol in l.CgoExports. This table is used to identify the correct Go symbol ABI to use to resolve references from host objects (which don't have ABIs).
func (*Loader) AddInteriorSym ¶
func (l *Loader) AddInteriorSym(container Sym, interior Sym)
AddInteriorSym sets up 'interior' as an interior symbol of container/payload symbol 'container'. An interior symbol does not itself have data, but gives a name to a subrange of the data in its container symbol. The container itself may or may not have a name. This method is intended primarily for use in the host object loaders, to capture the semantics of symbols and sections in an object file. When reading a host object file, we'll typically encounter a static section symbol (ex: ".text") containing content for a collection of functions, then a series of ELF (or macho, etc) symbol table entries each of which points into a sub-section (offset and length) of its corresponding container symbol. Within the go linker we create a loader.Sym for the container (which is expected to have the actual content/payload) and then a set of interior loader.Sym's that point into a portion of the container.
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 Textp 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) AttrUsedInIface ¶
func (l *Loader) AttrUsedInIface(i Sym) bool
AttrUsedInIface returns true for a type symbol that is used in an interface.
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) Aux ¶
func (l *Loader) Aux(i Sym, j int) Aux
Returns the "handle" to the j-th aux symbol of the i-th symbol.
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) DataString ¶
func (l *Loader) DataString(i Sym) string
Returns the symbol content of the i-th symbol as a string. 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) ForAllCgoExportDynamic ¶
func (l *Loader) ForAllCgoExportDynamic(f func(Sym))
ForAllCgoExportDynamic calls f for every symbol that has been marked with the "cgo_export_dynamic" compiler directive.
func (*Loader) FreeData ¶
func (l *Loader) FreeData(i Sym)
FreeData clears the symbol data of an external symbol, allowing the memory to be freed earlier. No-op for non-external symbols. i is global index.
func (*Loader) FreeSym ¶
func (l *Loader) FreeSym(i Sym)
func (*Loader) FuncInfo ¶
func (l *Loader) FuncInfo(i Sym) FuncInfo
func (*Loader) Funcdata ¶
func (l *Loader) Funcdata(i Sym, tmp []Sym) []Sym
Returns all funcdata symbols of symbol i. tmp is a scratch space.
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.
func (*Loader) GetVarDwarfAuxSym ¶
func (l *Loader) GetVarDwarfAuxSym(i Sym) Sym
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) IsDict ¶
func (l *Loader) IsDict(i Sym) bool
Returns whether this symbol is a dictionary symbol.
func (*Loader) IsExternal ¶
func (l *Loader) IsExternal(i Sym) bool
func (*Loader) IsFileLocal ¶
func (l *Loader) IsFileLocal(i Sym) bool
func (*Loader) IsFromAssembly ¶
func (l *Loader) IsFromAssembly(i Sym) bool
IsFromAssembly returns true if this symbol is derived from an object file generated by the Go assembler.
func (*Loader) IsGeneratedSym ¶
func (l *Loader) IsGeneratedSym(i Sym) bool
IsGeneratedSym returns true if a symbol's been previously marked as a generator symbol through the SetIsGeneratedSym. The functions for generator symbols are kept in the Link context.
func (*Loader) IsGoType ¶
func (l *Loader) IsGoType(i Sym) bool
Returns whether this is a Go type symbol.
func (*Loader) IsItab ¶
func (l *Loader) IsItab(i Sym) bool
Returns whether this symbol is an itab symbol.
func (*Loader) IsNoSplit ¶
func (l *Loader) IsNoSplit(i Sym) bool
Returns whether the i-th symbol is nosplit.
func (*Loader) IsPkgInit ¶
func (l *Loader) IsPkgInit(i Sym) bool
Returns whether this symbol is a compiler-generated package init func.
func (*Loader) IsReflectMethod ¶
func (l *Loader) IsReflectMethod(i Sym) bool
Returns whether the i-th symbol has ReflectMethod attribute set.
func (*Loader) IsTypelink ¶
func (l *Loader) IsTypelink(i Sym) bool
Returns whether this symbol should be included in typelink.
func (*Loader) LoadSyms ¶
func (l *Loader) LoadSyms(arch *sys.Arch)
Add syms, hashed (content-addressable) symbols, 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) LookupOrCreateCgoExport ¶
func (l *Loader) LookupOrCreateCgoExport(name string, ver int) Sym
LookupOrCreateCgoExport is like LookupOrCreateSym, but if ver indicates a global symbol, it uses the CgoExport table to determine the appropriate symbol version (ABI) to use. ver must be either 0 or a static symbol version.
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) NumFuncdata ¶
func (l *Loader) NumFuncdata(i Sym) int
Returns the number of funcdata for symbol i.
func (*Loader) NumPcdata ¶
func (l *Loader) NumPcdata(i Sym) int
Returns the number of pcdata for symbol i.
func (*Loader) OuterSym ¶
func (l *Loader) OuterSym(i Sym) Sym
OuterSym gets the outer/container symbol.
func (*Loader) PcdataAuxs ¶
func (l *Loader) PcdataAuxs(i Sym, tmp []Sym) (pcsp, pcfile, pcline, pcinline Sym, pcdata []Sym)
Returns all aux symbols of per-PC data for symbol i. tmp is a scratch space for the pcdata slice.
func (*Loader) Pcsp ¶
func (l *Loader) Pcsp(i Sym) Sym
func (*Loader) Preload ¶
func (l *Loader) Preload(localSymVersion int, f *bio.Reader, lib *sym.Library, unit *sym.CompilationUnit, length int64) goobj.FingerprintType
Preload a package: adds autolib. Does not add defined package or non-packaged symbols to the symbol table. These are done in LoadSyms. Does not read symbol data. Returns the fingerprint of the object.
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) SEHUnwindSym ¶
func (l *Loader) SEHUnwindSym(fnSymIdx Sym) Sym
SEHUnwindSym returns the auxiliary SEH unwind symbol associated with a given function symbol.
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 a 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) SetAttrUsedInIface ¶
func (l *Loader) SetAttrUsedInIface(i Sym, v bool)
func (*Loader) SetAttrVisibilityHidden ¶
func (l *Loader) SetAttrVisibilityHidden(i Sym, v bool)
SetAttrVisibilityHidden sets the "hidden visibility" property for a symbol (see AttrVisibilityHidden).
func (*Loader) SetCarrierSym ¶
func (l *Loader) SetCarrierSym(s Sym, c Sym)
SetCarrierSym declares that 'c' is the carrier or container symbol for 's'. Carrier symbols are used in the linker to as a container for a collection of sub-symbols where the content of the sub-symbols is effectively concatenated to form the content of the carrier. The carrier is given a name in the output symbol table while the sub-symbol names are not. For example, the Go compiler emits named string symbols (type SGOSTRING) when compiling a package; after being deduplicated, these symbols are collected into a single unit by assigning them a new carrier symbol named "go:string.*" (which appears in the final symbol table for the output load module).
func (*Loader) SetGot ¶
func (l *Loader) SetGot(i Sym, v int32)
SetGot sets the GOT offset of symbol i.
func (*Loader) SetIsDeferReturnTramp ¶
func (l *Loader) SetIsDeferReturnTramp(i Sym, v bool)
Set that i is a trampoline of a deferreturn call.
func (*Loader) SetIsGeneratedSym ¶
func (l *Loader) SetIsGeneratedSym(i Sym, v bool)
SetIsGeneratedSym marks symbols as generated symbols. Data shouldn't be stored in generated symbols, and a function is registered and called for each of these symbols.
func (*Loader) SetPlt ¶
func (l *Loader) SetPlt(i Sym, v int32)
SetPlt sets the PLT offset of symbol i.
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" offset 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)
SetSymSect 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) SortSyms ¶
func (l *Loader) SortSyms(ss []Sym)
SortSyms sorts a list of symbols by their value.
func (*Loader) Stat ¶
func (l *Loader) Stat() string
Symbol statistics.
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 offset of symbol s.
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 an offset in bytes of the "local entry" of a symbol.
On PPC64, a value of 1 indicates the symbol does not use or preserve a TOC pointer in R2, nor does it have a distinct local entry.
func (*Loader) SymName ¶
func (l *Loader) SymName(i Sym) string
Returns the 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 corresponds to sym.Symbol.File field.
func (*Loader) SymPlt ¶
func (l *Loader) SymPlt(s Sym) int32
SymPlt returns the PLT offset of symbol s.
func (*Loader) SymSect ¶
func (l *Loader) SymSect(i Sym) *sym.Section
SymSect 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, []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 pair of lists of loader.Sym's. First list corresponds to the corresponding to the undefined symbols themselves, the second list is the symbol that is making a reference to the undef. The "limit" param controls the maximum number of results returned; if "limit" is -1, then all undefs are returned.
func (*Loader) WasmImportSym ¶
func (l *Loader) WasmImportSym(fnSymIdx Sym) (Sym, bool)
WasmImportSym returns the auxiliary WebAssembly import symbol associated with a given function symbol. The aux sym only exists for Go function stubs that have been annotated with the //go:wasmimport directive. The aux sym contains the information necessary for the linker to add a WebAssembly import statement. (https://webassembly.github.io/spec/core/syntax/modules.html#imports)
type Reloc ¶
Reloc holds a "handle" to access a relocation record from an object file.
type Reloc struct {
*goobj.Reloc
// contains filtered or unexported fields
}
func (Reloc) IsMarker ¶
func (rel Reloc) IsMarker() bool
func (Reloc) SetSym ¶
func (rel Reloc) SetSym(s Sym)
func (Reloc) SetType ¶
func (rel Reloc) SetType(t objabi.RelocType)
func (Reloc) Sym ¶
func (rel Reloc) Sym() Sym
func (Reloc) Type ¶
func (rel Reloc) Type() objabi.RelocType
func (Reloc) Weak ¶
func (rel Reloc) Weak() bool
type Relocs ¶
Relocs encapsulates the set of relocations on a given symbol; an instance of this type is returned by the Loader Relocs() method.
type Relocs struct {
// contains filtered or unexported fields
}
func (*Relocs) At ¶
func (relocs *Relocs) At(j int) Reloc
At returns the j-th reloc for a global symbol.
func (*Relocs) Count ¶
func (relocs *Relocs) Count() int
type Sym ¶
Sym encapsulates a global symbol index, used to identify a specific Go symbol. The 0-valued Sym is corresponds to an invalid symbol.
type Sym = sym.LoaderSym
type SymbolBuilder ¶
SymbolBuilder is a helper designed to help with the construction of new symbol contents.
type SymbolBuilder struct {
// contains filtered or unexported fields
}
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) AddCStringAt ¶
func (sb *SymbolBuilder) AddCStringAt(off int64, str string) int64
AddCStringAt adds str plus a null terminating byte.
func (*SymbolBuilder) AddCURelativeAddrPlus ¶
func (sb *SymbolBuilder) AddCURelativeAddrPlus(arch *sys.Arch, tgt Sym, add int64) int64
func (*SymbolBuilder) AddInteriorSym ¶
func (sb *SymbolBuilder) AddInteriorSym(sub Sym)
func (*SymbolBuilder) AddPCRelPlus ¶
func (sb *SymbolBuilder) AddPCRelPlus(arch *sys.Arch, tgt Sym, add int64) int64
func (*SymbolBuilder) AddPEImageRelativeAddrPlus ¶
func (sb *SymbolBuilder) AddPEImageRelativeAddrPlus(arch *sys.Arch, tgt Sym, add int64) int64
func (*SymbolBuilder) AddRel ¶
func (sb *SymbolBuilder) AddRel(typ objabi.RelocType) (Reloc, int)
Add a relocation with given type, return its handle and index (to set other fields).
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) AddStringAt ¶
func (sb *SymbolBuilder) AddStringAt(off int64, str string) 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) AddUleb ¶
func (sb *SymbolBuilder) AddUleb(v uint64)
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) Reachable ¶
func (sb *SymbolBuilder) Reachable() bool
func (*SymbolBuilder) ReadOnly ¶
func (sb *SymbolBuilder) ReadOnly() bool
func (*SymbolBuilder) Relocs ¶
func (sb *SymbolBuilder) Relocs() Relocs
func (*SymbolBuilder) ResetRelocs ¶
func (sb *SymbolBuilder) ResetRelocs()
ResetRelocs removes all relocations on this symbol.
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) SetBytesAt ¶
func (sb *SymbolBuilder) SetBytesAt(off int64, b []byte) int64
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) 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) 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) SetUintptr ¶
func (sb *SymbolBuilder) SetUintptr(arch *sys.Arch, r int64, v uintptr) 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