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 Go to latest Published: Apr 10, 2024 License: BSD-3-Clause Imports: 36 Imported by: 1

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Constants

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const TextRevision = 0

Variables

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var ErrInvalidState = errors.New("instance state is invalid")
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var Memory mem

Memory implements Storage. It doesn't support program or instance persistence.

Functions

This section is empty.

Types

type Build 

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

Build a program and optionally an instance. FinishText, FinishProgram and (optionally) FinishInstance must be called in that order.

func NewBuild 

func NewBuild(storage Storage, moduleSize, maxTextSize int, objectMap *object.CallMap, instance bool) (*Build, error)

NewBuild for a program and optionally an instance.

func (*Build) Close 

func (b *Build) Close() (err error)

func (*Build) FinishInstance 

func (b *Build) FinishInstance(prog *Program, maxMemorySize, entryFuncIndex int) (*Instance, error)

FinishInstance after FinishProgram. Applicable only if an instance storage was specified in NewBuild call.

func (*Build) FinishProgram 

func (b *Build) FinishProgram(sectionMap SectionMap, mod compile.Module, startFuncIndex int, entryFuncs bool, snap *snapshot.Snapshot, bufferSectionHeaderLength int) (*Program, error)

FinishProgram after module, stack, globals and memory have been populated.

func (*Build) FinishText 

func (b *Build) FinishText(stackSize, stackUsage, globalsSize, memorySize int) error

FinishText after TextBuffer has been populated.

func (*Build) GlobalsMemoryBuffer 

func (b *Build) GlobalsMemoryBuffer() interface {
	Bytes() []byte
	ResizeBytes(n int) []byte
}

GlobalsMemoryBuffer is valid after FinishText. It must be populated before FinishProgram is called.

func (*Build) ImportResolver 

func (b *Build) ImportResolver() interface {
	ResolveFunc(module, field string, sig wa.FuncType) (index uint32, err error)
	ResolveGlobal(module, field string, t wa.Type) (value uint64, err error)
}

func (*Build) MemoryAlignment 

func (b *Build) MemoryAlignment() int

MemoryAlignment of GlobalsMemoryBuffer.

func (*Build) ModuleWriter 

func (b *Build) ModuleWriter() io.Writer

ModuleWriter is valid after NewBuild. The module must be written before FinishProgram is called.

func (*Build) ObjectMap 

func (b *Build) ObjectMap() *object.CallMap

func (*Build) ReadStack 

func (b *Build) ReadStack(r io.Reader, types []wa.FuncType, funcTypeIndexes []uint32) error

ReadStack if FinishText has been called with nonzero stackUsage. It must not be called after FinishProgram.

func (*Build) TextBuffer 

func (b *Build) TextBuffer() interface {
	Bytes() []byte
	Extend(n int) []byte
	PutByte(byte)
	PutUint32(uint32) // Little-endian byte order.
}

TextBuffer is valid after NewBuild. It must be populated before FinishText is called.

type Filesystem 

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

Filesystem implements Storage. It supports program and instance persistence.

func NewFilesystem 

func NewFilesystem(root string) (*Filesystem, error)

func NewFilesystemWithOwnership 

func NewFilesystemWithOwnership(root string, uid, gid int) (fs *Filesystem, err error)

func (*Filesystem) Close 

func (fs *Filesystem) Close() error

func (*Filesystem) Instances 

func (fs *Filesystem) Instances() ([]string, error)

func (*Filesystem) LoadInstance 

func (fs *Filesystem) LoadInstance(name string) (inst *Instance, err error)

func (*Filesystem) LoadProgram 

func (fs *Filesystem) LoadProgram(name string) (*Program, error)

func (*Filesystem) Programs 

func (fs *Filesystem) Programs() ([]string, error)

type Instance 

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

Instance is a program state. It may be undergoing mutation.

func NewInstance 

func NewInstance(prog *Program, maxMemorySize, maxStackSize, entryFuncIndex int) (*Instance, error)

func (*Instance) BeginMutation 

func (inst *Instance) BeginMutation(textAddr uint64) (file interface{ Fd() uintptr }, err error)

BeginMutation must be invoked when mutation starts. CheckMutation and Close may be called during the mutation. The returned file handle is valid until the next Instance method call.

func (*Instance) Breakpoints 

func (inst *Instance) Breakpoints() []uint64

Breakpoints are in ascending order and unique.

func (*Instance) CheckHaltedMutation 

func (inst *Instance) CheckHaltedMutation(result wa.ScalarCategory) (uint64, error)

CheckHaltedMutation is like CheckMutation, but it also returns the result of the top-level function. The result is undefined if the program terminated in some other way.

This is useful only with ReplaceCallStack, if you know that the program exits by returning.

func (*Instance) CheckMutation 

func (inst *Instance) CheckMutation() error

CheckMutation can be invoked after the mutation has ended.

func (*Instance) Close 

func (inst *Instance) Close() error

func (*Instance) EntryAddr 

func (inst *Instance) EntryAddr() uint32

func (*Instance) ExportStack 

func (inst *Instance) ExportStack(textMap stack.TextMap) ([]byte, error)

func (*Instance) Final 

func (inst *Instance) Final() bool

func (*Instance) Flags 

func (inst *Instance) Flags() snapshot.Flags

func (*Instance) Globals 

func (inst *Instance) Globals(prog *Program) ([]uint64, error)

func (*Instance) GlobalsSize 

func (inst *Instance) GlobalsSize() int

func (*Instance) MaxMemorySize 

func (inst *Instance) MaxMemorySize() int

func (*Instance) MemorySize 

func (inst *Instance) MemorySize() int

func (*Instance) MonotonicTime 

func (inst *Instance) MonotonicTime() uint64

func (*Instance) ReplaceCallStack 

func (inst *Instance) ReplaceCallStack(funcAddr uint32, funcArgs []uint64) error

ReplaceCallStack with a "suspended" function call with given arguments. Pending start function, entry function, and existing suspended state are discarded. Arguments are not checked against function signature.

This is a low-level API primarily useful for testing.

func (*Instance) Result 

func (inst *Instance) Result() int32

func (*Instance) SetBreakpoints 

func (inst *Instance) SetBreakpoints(a []uint64)

SetBreakpoints which must have been sorted and deduplicated.

func (*Instance) SetEntryFunc 

func (inst *Instance) SetEntryFunc(prog *Program, index int) error

func (*Instance) SetFinal 

func (inst *Instance) SetFinal()

func (*Instance) SetResult 

func (inst *Instance) SetResult(n int32)

func (*Instance) SetTrap 

func (inst *Instance) SetTrap(id trap.ID)

func (*Instance) StackSize 

func (inst *Instance) StackSize() int

func (*Instance) StackUsage 

func (inst *Instance) StackUsage() int

func (*Instance) Stacktrace 

func (inst *Instance) Stacktrace(textMap stack.TextMap, funcTypes []wa.FuncType) ([]stack.Frame, error)

func (*Instance) StartAddr 

func (inst *Instance) StartAddr() uint32

func (*Instance) Store 

func (inst *Instance) Store(name, progName string, prog *Program) error

Store the instance. The names must not contain path separators.

func (*Instance) TextAddr 

func (inst *Instance) TextAddr() uint64

func (*Instance) Trap 

func (inst *Instance) Trap() trap.ID

func (*Instance) Unstore 

func (inst *Instance) Unstore() error

type InstanceStorage 

type InstanceStorage interface {
	Instances() (names []string, err error)
	LoadInstance(name string) (*Instance, error)
	// contains filtered or unexported methods
}

func PersistentMemory 

func PersistentMemory(storage *Filesystem) InstanceStorage

PersistentMemory supports instance persistence by copying data to and from a Filesystem.

func PrepareInstances 

func PrepareInstances(ctx context.Context, storage InstanceStorage, bufsize int) InstanceStorage

PrepareInstances wraps an InstanceStorage. The wrapper creates instance resources in advance.

type Program 

type Program struct {
	Map object.CallMap
	// contains filtered or unexported fields
}

func Snapshot 

func Snapshot(oldProg *Program, inst *Instance, buffers snapshot.Buffers, suspended bool) (*Program, error)

func (*Program) Breakpoints 

func (prog *Program) Breakpoints() []uint64

Breakpoints are in ascending order and unique.

func (*Program) Close 

func (prog *Program) Close() error

func (*Program) LoadBuffers 

func (prog *Program) LoadBuffers() (bs snapshot.Buffers, err error)

func (*Program) ModuleSize 

func (prog *Program) ModuleSize() int64

func (*Program) NewModuleReader 

func (prog *Program) NewModuleReader() io.Reader

func (*Program) PageSize 

func (prog *Program) PageSize() int

func (*Program) Random 

func (prog *Program) Random() bool

func (*Program) ResolveEntryFunc 

func (prog *Program) ResolveEntryFunc(exportName string, started bool) (int, error)

ResolveEntryFunc index or the implicit _start function index. The started argument is disregarded if the program is a snapshot.

func (*Program) Store 

func (prog *Program) Store(name string) error

Store the program. The name must not contain path separators.

func (*Program) Text 

func (prog *Program) Text() (file interface{ Fd() uintptr }, err error)

func (*Program) TextSize 

func (prog *Program) TextSize() int

type ProgramStorage 

type ProgramStorage interface {
	Programs() (names []string, err error)
	// contains filtered or unexported methods
}

func PreparePrograms 

func PreparePrograms(ctx context.Context, storage ProgramStorage, bufsize int) ProgramStorage

PreparePrograms wraps a ProgramStorage. The wrapper creates program resources in advance.

type SectionMap 

type SectionMap struct {
	section.Map

	Snapshot   section.ByteRange
	ExportWrap section.ByteRange
	Buffer     section.ByteRange
	Stack      section.ByteRange
}

type Storage 

type Storage interface {
	ProgramStorage
	InstanceStorage

	LoadProgram(name string) (*Program, error)
}

func CombinedStorage 

func CombinedStorage(prog ProgramStorage, inst InstanceStorage) Storage

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