Crate wasmtime_environ

Expand description

Internal dependency of the wasmtime crate.

This crate is responsible for defining types and basic runtime structures used by the wasmtime crate. This additionally defines primitives of compilation and what compilers are expected to emit.

If you don’t already know what this crate is you probably want to use wasmtime, not this crate.

Re-exports§

pub use object;
pub use wasmparser;

Modules§

__core: The Rust Core Library
component: Support for the component model in Wasmtime.
drc: Layout of Wasm GC objects in the deferred reference-counting collector.
fact: Wasmtime’s Fused Adapter Compiler of Trampolines (FACT)
null: Layout of Wasm GC objects in the null garbage collector.
obj: Utilities for working with object files that operate as Wasmtime’s serialization and intermediate format for compiled modules.
packed_option: Compact representation of Option<T> for types with a reserved value.
prelude: Rust module prelude for Wasmtime crates.

Macros§

entity_impl: Macro which provides the common implementation of a 32-bit entity reference.
foreach_builtin_component_function: Helper macro, like foreach_transcoder, to iterate over builtins for components unrelated to transcoding.
foreach_builtin_function: Helper macro to iterate over all builtin functions and their signatures.
wasm_unsupported: Return an Err(WasmError::Unsupported(msg)) where msg the string built by calling format! on the arguments to this macro.

Structs§

AddressMapSection: Builder for the address map section of a wasmtime compilation image.
BoxedSlice: A slice mapping K -> V allocating dense entity references.
BuiltinFunctionIndex: An index type for builtin functions.
CompiledFunctionBody: The result of compiling a single function body.
CompiledFunctionInfo: Secondary in-memory results of function compilation.
CompiledModuleInfo: Secondary in-memory results of module compilation.
ConfigTunables: Optional tunable configuration options used in wasmtime::Config
ConstExpr: A constant expression.
DataIndex: Index type of a passive data segment inside the WebAssembly module.
DebugInfoData
DefinedFuncIndex: Index type of a defined function inside the WebAssembly module.
DefinedGlobalIndex: Index type of a defined global inside the WebAssembly module.
DefinedMemoryIndex: Index type of a defined memory inside the WebAssembly module.
DefinedTableIndex: Index type of a defined table inside the WebAssembly module.
DefinedTagIndex: Index type of a defined tag inside the WebAssembly module.
ElemIndex: Index type of a passive element segment inside the WebAssembly module.
EngineInternedRecGroupIndex: Index type of a canonicalized recursive type group inside the whole engine (as opposed to canonicalized within just a single Wasm module).
EntityList: A small list of entity references allocated from a pool.
EntitySet: A set of K for densely indexed entity references.
FilePos: A position within an original source file,
FuncIndex: Index type of a function (imported or defined) inside the WebAssembly module.
FuncRefIndex: Index into the funcref table within a VMContext for a function.
FunctionBodyData: Contains function data: byte code and its offset in the module.
FunctionLoc: Description of where a function is located in the text section of a compiled image.
FunctionMetadata
FunctionName: The name of a function stored in the ELF_NAME_DATA section.
FunctionType: Type information about functions in a wasm module.
GcArrayLayout: The layout of a GC-managed array.
GcStructLayout: The layout for a GC-managed struct type.
GcStructLayoutField: A field in a GcStructLayout.
Global: A WebAssembly global.
GlobalIndex: Index type of a global variable (imported or defined) inside the WebAssembly module.
HostPtr: Type representing the size of a pointer for the current compilation host
InstructionAddressMap: Single source location to generated address mapping.
Iter: Iterate over all keys in order.
IterEntityRange: Iterator type returned by iter_entity_range.
IterMut: Iterate over all keys in order.
Keys: Iterate over all keys in order.
Limits: The size range of resizeable storage associated with Memory types and Table types.
ListPool: A memory pool for storing lists of T.
Memory: WebAssembly linear memory.
MemoryIndex: Index type of a linear memory (imported or defined) inside the WebAssembly module.
MemoryInitializer: A WebAssembly linear memory initializer.
Metadata: Metadata associated with a compiled ELF artifact.
Module: A translated WebAssembly module, excluding the function bodies and memory initializers.
ModuleEnvironment: Object containing the standalone environment information.
ModuleInternedRecGroupIndex: Index type of a canonicalized recursive type group inside a WebAssembly module (as opposed to canonicalized within the whole engine).
ModuleInternedTypeIndex: A canonicalized type index for a type within a single WebAssembly module.
ModuleTranslation: The result of translating via ModuleEnvironment. Function bodies are not yet translated, and data initializers have not yet been copied out of the original buffer.
ModuleTypes: All types used in a core wasm module.
ModuleTypesBuilder: A builder for ModuleTypes.
NameSection
ObjectBuilder: Helper structure to create an ELF file as a compilation artifact.
OwnedMemoryIndex: Index type of a defined memory inside the WebAssembly module.
PrimaryMap: A primary mapping K -> V allocating dense entity references.
RecGroupRelativeTypeIndex: A canonicalized type index referencing a type within a single recursion group from another type within that same recursion group.
ScopeVec: Small data structure to help extend the lifetime of a slice to a higher scope.
SecondaryMap: A mapping K -> V for densely indexed entity references.
SetIter: An iterator over the elements in an EntitySet.
Setting: Description of compiler settings returned by CompilerBuilder::settings.
SizeOverflow
SparseMap: A sparse mapping of entity references.
StackMap: A map for determining where live GC references live in a stack frame.
StackMapSection: Builder for the ELF_WASMTIME_STACK_MAP section in compiled executables.
StaticMemoryInitializer: Similar to the above MemoryInitializer but only used when memory initializers are statically known to be valid.
StaticModuleIndex: Index into the global list of modules found within an entire component.
Table: WebAssembly table.
TableIndex: Index type of a table (imported or defined) inside the WebAssembly module.
TableInitialization: Table initialization data for all tables in the module.
TableSegment: A WebAssembly table initializer segment.
Tag: WebAssembly exception and control tag.
TagIndex: Index type of an event inside the WebAssembly module.
TrapEncodingBuilder: A helper structure to build the custom-encoded section of a wasmtime compilation image which encodes trap information.
TrapInformation: Information about trap.
Tunables: Tunable parameters for WebAssembly compilation.
TypeIndex: Index type of a type (imported or defined) inside the WebAssembly module.
VMOffsets: This class computes offsets to fields within VMContext and other related structs that JIT code accesses directly.
VMOffsetsFields: Used to construct a VMOffsets
VMSharedTypeIndex: A canonicalized type index into an engine’s shared type registry.
WasmArrayType: A concrete array type.
WasmCompositeType
WasmContType: WebAssembly continuation type – equivalent of wasmparser’s ContType.
WasmFieldType: The type of a struct field or array element.
WasmFileInfo
WasmFuncType: WebAssembly function type – equivalent of wasmparser’s FuncType.
WasmRecGroup: A recursive type group.
WasmRefType: WebAssembly reference type – equivalent of wasmparser’s RefType
WasmStructType: A concrete struct type.
WasmSubType: A concrete, user-defined (or host-defined) Wasm type.
WasmparserTypeConverter: A convert from wasmparser types to Wasmtime types.

Enums§

Collector: The garbage collector implementation to use.
CompileError: An error while compiling WebAssembly to machine code.
ConstOp: The subset of Wasm opcodes that are constant.
EngineOrModuleTypeIndex: An interned type index, either at the module or engine level.
EntityIndex: An index of an entity.
EntityType: A type of an item in a wasm module where an item is typically something that can be exported.
FlagValue: Value of a configured setting for a Compiler
GcLayout: The layout of a GC-managed object.
HostCall: Enumeration of all possible ways that wasm may execute code in the host.
IndexType: The type that can be used to index into Memory and Table.
Initializer: Initialization routines for creating an instance, encompassing imports, modules, instances, aliases, etc.
MemoryInitialization: The type of WebAssembly linear memory initialization to use for a module.
ObjectKind: Types of objects that can be created by Compiler::object
RelocationTarget: What relocations can be applied against.
SettingKind: Different kinds of Setting values that can be configured in a CompilerBuilder
TableInitialValue: Initial value for all elements in a table.
TableSegmentElements: Elements of a table segment, either a list of functions or list of arbitrary expressions.
Trap
TrapSentinel: Return value of BuiltinFunctionIndex::trap_sentinel.
VMGcKind: The kind of an object in a GC heap.
WasmCompositeInnerType: A function, array, or struct type.
WasmError: A WebAssembly translation error.
WasmHeapBottomType: A bottom heap type.
WasmHeapTopType: A top heap type.
WasmHeapType: WebAssembly heap type – equivalent of wasmparser’s HeapType
WasmStorageType: Represents storage types introduced in the GC spec for array and struct fields.
WasmValType: WebAssembly value type – equivalent of wasmparser::ValType.

Constants§

FUNCREF_INIT_BIT: An “initialized bit” in a funcref table.
FUNCREF_MASK: The mask we apply to all refs loaded from funcref tables.
I31_DISCRIMINANT: Discriminant to check whether GC reference is an i31ref or not.
VERSION: Version number of this crate.
VMCONTEXT_MAGIC: Magic value for core Wasm VM contexts.
VM_ARRAY_CALL_HOST_FUNC_MAGIC: Equivalent of VMCONTEXT_MAGIC except for array-call host functions.
VM_GC_HEADER_ALIGN: The minimum alignment of the VMGcHeader in bytes.
VM_GC_HEADER_KIND_OFFSET: The offset of the VMGcKind field in the VMGcHeader.
VM_GC_HEADER_SIZE: The size of the VMGcHeader in bytes.
VM_GC_HEADER_TYPE_INDEX_OFFSET: The offset of the VMSharedTypeIndex field in the VMGcHeader.
WASM32_MAX_SIZE: Maximum size, in bytes, of 32-bit memories (4G)

Traits§

CacheStore: Implementation of an incremental compilation’s key/value cache store.
Compiler: An implementation of a compiler which can compile WebAssembly functions to machine code and perform other miscellaneous tasks needed by the JIT runtime.
CompilerBuilder: Abstract trait representing the ability to create a Compiler below.
EntityRef: A type wrapping a small integer index should implement EntityRef so it can be used as the key of an SecondaryMap or SparseMap.
FinishedObject: A type which can be the result of serializing an object.
GcTypeLayouts: A trait for getting the layout of a Wasm GC struct or array inside a particular collector.
InitMemory: The various callbacks provided here are used to drive the smaller bits of memory initialization.
PtrSize: Trait used for the ptr representation of the field of VMOffsets
Signed: Helper trait used to add signed() methods to primitive unsigned integer types.
SparseMapValue: Trait for extracting keys from values stored in a SparseMap.
TripleExt: Extension methods for target_lexicon::Triple.
TypeConvert: Helpers used to convert a wasmparser type to a type in this crate.
TypeTrace: A trait for things that can trace all type-to-type edges, aka all type indices within this thing.
Unsigned: Helper trait used to add unsigned() methods to primitive signed integer types.

Functions§

byte_size_of_wasm_ty_in_gc_heap: Get the byte size of the given Wasm type when it is stored inside the GC heap.
demangle_function_name: Demangles a single function name into a user-readable form.
demangle_function_name_or_index: Demangles a function name if it’s provided, or returns a unified representation based on the function index otherwise.
iter_entity_range: Iterate over a Range<E: EntityRef>, yielding a sequence of E items.
iterate_address_map: Iterate over the address map contained in the given address map section.
iterate_traps: Returns an iterator over all of the traps encoded in section, which should have been produced by TrapEncodingBuilder.
lookup_file_pos: Lookup an offset within an encoded address map section, returning the original FilePos that corresponds to the offset, if found.
lookup_trap_code: Decodes the provided trap information section and attempts to find the trap code corresponding to the offset specified.

Type Aliases§

Dwarf
SparseSet: A sparse set of entity references.
WasmResult: A convenient alias for a Result that uses WasmError as the error type.

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