e71ccbf9bc
This commit implements the pooling instance allocator. The allocation strategy can be set with `Config::with_allocation_strategy`. The pooling strategy uses the pooling instance allocator to preallocate a contiguous region of memory for instantiating modules that adhere to various limits. The intention of the pooling instance allocator is to reserve as much of the host address space needed for instantiating modules ahead of time and to reuse committed memory pages wherever possible.
690 lines
22 KiB
Rust
690 lines
22 KiB
Rust
//! Offsets and sizes of various structs in wasmtime-runtime's vmcontext
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//! module.
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// Currently the `VMContext` allocation by field looks like this:
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//
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// struct VMContext {
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// interrupts: *const VMInterrupts,
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// externref_activations_table: *mut VMExternRefActivationsTable,
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// stack_map_registry: *mut StackMapRegistry,
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// signature_ids: [VMSharedSignatureIndex; module.num_signature_ids],
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// imported_functions: [VMFunctionImport; module.num_imported_functions],
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// imported_tables: [VMTableImport; module.num_imported_tables],
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// imported_memories: [VMMemoryImport; module.num_imported_memories],
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// imported_globals: [VMGlobalImport; module.num_imported_globals],
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// tables: [VMTableDefinition; module.num_defined_tables],
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// memories: [VMMemoryDefinition; module.num_defined_memories],
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// globals: [VMGlobalDefinition; module.num_defined_globals],
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// anyfuncs: [VMCallerCheckedAnyfunc; module.num_imported_functions + module.num_defined_functions],
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// builtins: VMBuiltinFunctionsArray,
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// }
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use crate::module::Module;
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use crate::BuiltinFunctionIndex;
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use cranelift_codegen::ir;
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use cranelift_wasm::{
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DefinedGlobalIndex, DefinedMemoryIndex, DefinedTableIndex, FuncIndex, GlobalIndex, MemoryIndex,
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TableIndex, TypeIndex,
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};
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use more_asserts::assert_lt;
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use std::convert::TryFrom;
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/// Sentinel value indicating that wasm has been interrupted.
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// Note that this has a bit of an odd definition. See the `insert_stack_check`
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// function in `cranelift/codegen/src/isa/x86/abi.rs` for more information
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pub const INTERRUPTED: usize = usize::max_value() - 32 * 1024;
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#[cfg(target_pointer_width = "32")]
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fn cast_to_u32(sz: usize) -> u32 {
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u32::try_from(sz).unwrap()
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}
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#[cfg(target_pointer_width = "64")]
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fn cast_to_u32(sz: usize) -> u32 {
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u32::try_from(sz).expect("overflow in cast from usize to u32")
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}
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/// Align an offset used in this module to a specific byte-width by rounding up
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fn align(offset: u32, width: u32) -> u32 {
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(offset + (width - 1)) / width * width
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}
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/// This class computes offsets to fields within `VMContext` and other
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/// related structs that JIT code accesses directly.
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#[derive(Debug, Clone, Copy)]
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pub struct VMOffsets {
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/// The size in bytes of a pointer on the target.
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pub pointer_size: u8,
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/// The number of signature declarations in the module.
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pub num_signature_ids: u32,
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/// The number of imported functions in the module.
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pub num_imported_functions: u32,
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/// The number of imported tables in the module.
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pub num_imported_tables: u32,
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/// The number of imported memories in the module.
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pub num_imported_memories: u32,
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/// The number of imported globals in the module.
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pub num_imported_globals: u32,
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/// The number of defined functions in the module.
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pub num_defined_functions: u32,
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/// The number of defined tables in the module.
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pub num_defined_tables: u32,
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/// The number of defined memories in the module.
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pub num_defined_memories: u32,
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/// The number of defined globals in the module.
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pub num_defined_globals: u32,
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}
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impl VMOffsets {
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/// Return a new `VMOffsets` instance, for a given pointer size.
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pub fn new(pointer_size: u8, module: &Module) -> Self {
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Self {
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pointer_size,
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num_signature_ids: cast_to_u32(module.types.len()),
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num_imported_functions: cast_to_u32(module.num_imported_funcs),
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num_imported_tables: cast_to_u32(module.num_imported_tables),
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num_imported_memories: cast_to_u32(module.num_imported_memories),
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num_imported_globals: cast_to_u32(module.num_imported_globals),
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num_defined_functions: cast_to_u32(module.functions.len()),
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num_defined_tables: cast_to_u32(module.table_plans.len()),
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num_defined_memories: cast_to_u32(module.memory_plans.len()),
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num_defined_globals: cast_to_u32(module.globals.len()),
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}
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}
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}
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/// Offsets for `VMFunctionImport`.
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impl VMOffsets {
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/// The offset of the `body` field.
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#[allow(clippy::erasing_op)]
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pub fn vmfunction_import_body(&self) -> u8 {
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0 * self.pointer_size
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}
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/// The offset of the `vmctx` field.
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#[allow(clippy::identity_op)]
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pub fn vmfunction_import_vmctx(&self) -> u8 {
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1 * self.pointer_size
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}
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/// Return the size of `VMFunctionImport`.
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pub fn size_of_vmfunction_import(&self) -> u8 {
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2 * self.pointer_size
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}
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}
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/// Offsets for `*const VMFunctionBody`.
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impl VMOffsets {
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/// The size of the `current_elements` field.
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#[allow(clippy::identity_op)]
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pub fn size_of_vmfunction_body_ptr(&self) -> u8 {
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1 * self.pointer_size
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}
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}
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/// Offsets for `VMTableImport`.
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impl VMOffsets {
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/// The offset of the `from` field.
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#[allow(clippy::erasing_op)]
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pub fn vmtable_import_from(&self) -> u8 {
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0 * self.pointer_size
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}
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/// The offset of the `vmctx` field.
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#[allow(clippy::identity_op)]
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pub fn vmtable_import_vmctx(&self) -> u8 {
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1 * self.pointer_size
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}
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/// Return the size of `VMTableImport`.
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pub fn size_of_vmtable_import(&self) -> u8 {
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2 * self.pointer_size
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}
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}
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/// Offsets for `VMTableDefinition`.
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impl VMOffsets {
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/// The offset of the `base` field.
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#[allow(clippy::erasing_op)]
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pub fn vmtable_definition_base(&self) -> u8 {
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0 * self.pointer_size
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}
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/// The offset of the `current_elements` field.
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#[allow(clippy::identity_op)]
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pub fn vmtable_definition_current_elements(&self) -> u8 {
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1 * self.pointer_size
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}
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/// The size of the `current_elements` field.
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pub fn size_of_vmtable_definition_current_elements(&self) -> u8 {
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4
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}
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/// Return the size of `VMTableDefinition`.
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pub fn size_of_vmtable_definition(&self) -> u8 {
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2 * self.pointer_size
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}
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/// The type of the `current_elements` field.
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pub fn type_of_vmtable_definition_current_elements(&self) -> ir::Type {
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ir::Type::int(u16::from(self.size_of_vmtable_definition_current_elements()) * 8).unwrap()
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}
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}
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/// Offsets for `VMMemoryImport`.
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impl VMOffsets {
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/// The offset of the `from` field.
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#[allow(clippy::erasing_op)]
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pub fn vmmemory_import_from(&self) -> u8 {
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0 * self.pointer_size
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}
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/// The offset of the `vmctx` field.
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#[allow(clippy::identity_op)]
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pub fn vmmemory_import_vmctx(&self) -> u8 {
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1 * self.pointer_size
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}
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/// Return the size of `VMMemoryImport`.
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pub fn size_of_vmmemory_import(&self) -> u8 {
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2 * self.pointer_size
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}
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}
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/// Offsets for `VMMemoryDefinition`.
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impl VMOffsets {
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/// The offset of the `base` field.
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#[allow(clippy::erasing_op)]
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pub fn vmmemory_definition_base(&self) -> u8 {
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0 * self.pointer_size
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}
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/// The offset of the `current_length` field.
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#[allow(clippy::identity_op)]
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pub fn vmmemory_definition_current_length(&self) -> u8 {
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1 * self.pointer_size
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}
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/// The size of the `current_length` field.
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pub fn size_of_vmmemory_definition_current_length(&self) -> u8 {
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4
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}
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/// Return the size of `VMMemoryDefinition`.
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pub fn size_of_vmmemory_definition(&self) -> u8 {
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2 * self.pointer_size
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}
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/// The type of the `current_length` field.
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pub fn type_of_vmmemory_definition_current_length(&self) -> ir::Type {
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ir::Type::int(u16::from(self.size_of_vmmemory_definition_current_length()) * 8).unwrap()
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}
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}
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/// Offsets for `VMGlobalImport`.
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impl VMOffsets {
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/// The offset of the `from` field.
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#[allow(clippy::erasing_op)]
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pub fn vmglobal_import_from(&self) -> u8 {
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0 * self.pointer_size
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}
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/// Return the size of `VMGlobalImport`.
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#[allow(clippy::identity_op)]
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pub fn size_of_vmglobal_import(&self) -> u8 {
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1 * self.pointer_size
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}
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}
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/// Offsets for `VMGlobalDefinition`.
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impl VMOffsets {
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/// Return the size of `VMGlobalDefinition`; this is the size of the largest value type (i.e. a
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/// V128).
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pub fn size_of_vmglobal_definition(&self) -> u8 {
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16
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}
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}
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/// Offsets for `VMSharedSignatureIndex`.
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impl VMOffsets {
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/// Return the size of `VMSharedSignatureIndex`.
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pub fn size_of_vmshared_signature_index(&self) -> u8 {
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4
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}
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}
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/// Offsets for `VMInterrupts`.
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impl VMOffsets {
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/// Return the offset of the `stack_limit` field of `VMInterrupts`
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pub fn vminterrupts_stack_limit(&self) -> u8 {
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0
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}
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/// Return the offset of the `fuel_consumed` field of `VMInterrupts`
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pub fn vminterrupts_fuel_consumed(&self) -> u8 {
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self.pointer_size
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}
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}
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/// Offsets for `VMCallerCheckedAnyfunc`.
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impl VMOffsets {
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/// The offset of the `func_ptr` field.
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#[allow(clippy::erasing_op)]
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pub fn vmcaller_checked_anyfunc_func_ptr(&self) -> u8 {
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0 * self.pointer_size
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}
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/// The offset of the `type_index` field.
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#[allow(clippy::identity_op)]
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pub fn vmcaller_checked_anyfunc_type_index(&self) -> u8 {
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1 * self.pointer_size
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}
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/// The offset of the `vmctx` field.
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pub fn vmcaller_checked_anyfunc_vmctx(&self) -> u8 {
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2 * self.pointer_size
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}
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/// Return the size of `VMCallerCheckedAnyfunc`.
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pub fn size_of_vmcaller_checked_anyfunc(&self) -> u8 {
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3 * self.pointer_size
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}
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}
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/// Offsets for `VMContext`.
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impl VMOffsets {
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/// Return the offset to the `VMInterrupts` structure
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pub fn vmctx_interrupts(&self) -> u32 {
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0
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}
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/// The offset of the `VMExternRefActivationsTable` member.
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pub fn vmctx_externref_activations_table(&self) -> u32 {
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self.vmctx_interrupts()
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.checked_add(u32::from(self.pointer_size))
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.unwrap()
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}
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/// The offset of the `*mut StackMapRegistry` member.
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pub fn vmctx_stack_map_registry(&self) -> u32 {
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self.vmctx_externref_activations_table()
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.checked_add(u32::from(self.pointer_size))
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.unwrap()
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}
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/// The offset of the `signature_ids` array.
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pub fn vmctx_signature_ids_begin(&self) -> u32 {
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self.vmctx_stack_map_registry()
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.checked_add(u32::from(self.pointer_size))
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.unwrap()
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}
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/// The offset of the `tables` array.
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#[allow(clippy::erasing_op)]
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pub fn vmctx_imported_functions_begin(&self) -> u32 {
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self.vmctx_signature_ids_begin()
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.checked_add(
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self.num_signature_ids
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.checked_mul(u32::from(self.size_of_vmshared_signature_index()))
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.unwrap(),
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)
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.unwrap()
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}
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/// The offset of the `tables` array.
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#[allow(clippy::identity_op)]
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pub fn vmctx_imported_tables_begin(&self) -> u32 {
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self.vmctx_imported_functions_begin()
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.checked_add(
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self.num_imported_functions
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.checked_mul(u32::from(self.size_of_vmfunction_import()))
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.unwrap(),
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)
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.unwrap()
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}
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/// The offset of the `memories` array.
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pub fn vmctx_imported_memories_begin(&self) -> u32 {
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self.vmctx_imported_tables_begin()
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.checked_add(
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self.num_imported_tables
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.checked_mul(u32::from(self.size_of_vmtable_import()))
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.unwrap(),
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)
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.unwrap()
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}
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/// The offset of the `globals` array.
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pub fn vmctx_imported_globals_begin(&self) -> u32 {
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self.vmctx_imported_memories_begin()
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.checked_add(
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self.num_imported_memories
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.checked_mul(u32::from(self.size_of_vmmemory_import()))
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.unwrap(),
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)
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.unwrap()
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}
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/// The offset of the `tables` array.
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pub fn vmctx_tables_begin(&self) -> u32 {
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self.vmctx_imported_globals_begin()
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.checked_add(
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self.num_imported_globals
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.checked_mul(u32::from(self.size_of_vmglobal_import()))
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.unwrap(),
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)
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.unwrap()
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}
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/// The offset of the `memories` array.
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pub fn vmctx_memories_begin(&self) -> u32 {
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self.vmctx_tables_begin()
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.checked_add(
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self.num_defined_tables
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.checked_mul(u32::from(self.size_of_vmtable_definition()))
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.unwrap(),
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)
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.unwrap()
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}
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/// The offset of the `globals` array.
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pub fn vmctx_globals_begin(&self) -> u32 {
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let offset = self
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.vmctx_memories_begin()
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.checked_add(
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self.num_defined_memories
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.checked_mul(u32::from(self.size_of_vmmemory_definition()))
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.unwrap(),
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)
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.unwrap();
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align(offset, 16)
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}
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/// The offset of the `anyfuncs` array.
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pub fn vmctx_anyfuncs_begin(&self) -> u32 {
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self.vmctx_globals_begin()
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.checked_add(
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self.num_defined_globals
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.checked_mul(u32::from(self.size_of_vmglobal_definition()))
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.unwrap(),
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)
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.unwrap()
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}
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/// The offset of the builtin functions array.
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pub fn vmctx_builtin_functions_begin(&self) -> u32 {
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self.vmctx_anyfuncs_begin()
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.checked_add(
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self.num_imported_functions
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.checked_add(self.num_defined_functions)
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.unwrap()
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.checked_mul(u32::from(self.size_of_vmcaller_checked_anyfunc()))
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.unwrap(),
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)
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.unwrap()
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}
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/// Return the size of the `VMContext` allocation.
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pub fn size_of_vmctx(&self) -> u32 {
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self.vmctx_builtin_functions_begin()
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.checked_add(
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BuiltinFunctionIndex::builtin_functions_total_number()
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.checked_mul(u32::from(self.pointer_size))
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.unwrap(),
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)
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.unwrap()
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}
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/// Return the offset to `VMSharedSignatureId` index `index`.
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pub fn vmctx_vmshared_signature_id(&self, index: TypeIndex) -> u32 {
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assert_lt!(index.as_u32(), self.num_signature_ids);
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self.vmctx_signature_ids_begin()
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.checked_add(
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index
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.as_u32()
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.checked_mul(u32::from(self.size_of_vmshared_signature_index()))
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.unwrap(),
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)
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.unwrap()
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}
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/// Return the offset to `VMFunctionImport` index `index`.
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pub fn vmctx_vmfunction_import(&self, index: FuncIndex) -> u32 {
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assert_lt!(index.as_u32(), self.num_imported_functions);
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self.vmctx_imported_functions_begin()
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.checked_add(
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index
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.as_u32()
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.checked_mul(u32::from(self.size_of_vmfunction_import()))
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.unwrap(),
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)
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.unwrap()
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}
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/// Return the offset to `VMTableImport` index `index`.
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pub fn vmctx_vmtable_import(&self, index: TableIndex) -> u32 {
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assert_lt!(index.as_u32(), self.num_imported_tables);
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self.vmctx_imported_tables_begin()
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.checked_add(
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index
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.as_u32()
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.checked_mul(u32::from(self.size_of_vmtable_import()))
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.unwrap(),
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)
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.unwrap()
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}
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/// Return the offset to `VMMemoryImport` index `index`.
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pub fn vmctx_vmmemory_import(&self, index: MemoryIndex) -> u32 {
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assert_lt!(index.as_u32(), self.num_imported_memories);
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self.vmctx_imported_memories_begin()
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.checked_add(
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index
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.as_u32()
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.checked_mul(u32::from(self.size_of_vmmemory_import()))
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.unwrap(),
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)
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.unwrap()
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}
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/// Return the offset to `VMGlobalImport` index `index`.
|
|
pub fn vmctx_vmglobal_import(&self, index: GlobalIndex) -> u32 {
|
|
assert_lt!(index.as_u32(), self.num_imported_globals);
|
|
self.vmctx_imported_globals_begin()
|
|
.checked_add(
|
|
index
|
|
.as_u32()
|
|
.checked_mul(u32::from(self.size_of_vmglobal_import()))
|
|
.unwrap(),
|
|
)
|
|
.unwrap()
|
|
}
|
|
|
|
/// Return the offset to `VMTableDefinition` index `index`.
|
|
pub fn vmctx_vmtable_definition(&self, index: DefinedTableIndex) -> u32 {
|
|
assert_lt!(index.as_u32(), self.num_defined_tables);
|
|
self.vmctx_tables_begin()
|
|
.checked_add(
|
|
index
|
|
.as_u32()
|
|
.checked_mul(u32::from(self.size_of_vmtable_definition()))
|
|
.unwrap(),
|
|
)
|
|
.unwrap()
|
|
}
|
|
|
|
/// Return the offset to `VMMemoryDefinition` index `index`.
|
|
pub fn vmctx_vmmemory_definition(&self, index: DefinedMemoryIndex) -> u32 {
|
|
assert_lt!(index.as_u32(), self.num_defined_memories);
|
|
self.vmctx_memories_begin()
|
|
.checked_add(
|
|
index
|
|
.as_u32()
|
|
.checked_mul(u32::from(self.size_of_vmmemory_definition()))
|
|
.unwrap(),
|
|
)
|
|
.unwrap()
|
|
}
|
|
|
|
/// Return the offset to the `VMGlobalDefinition` index `index`.
|
|
pub fn vmctx_vmglobal_definition(&self, index: DefinedGlobalIndex) -> u32 {
|
|
assert_lt!(index.as_u32(), self.num_defined_globals);
|
|
self.vmctx_globals_begin()
|
|
.checked_add(
|
|
index
|
|
.as_u32()
|
|
.checked_mul(u32::from(self.size_of_vmglobal_definition()))
|
|
.unwrap(),
|
|
)
|
|
.unwrap()
|
|
}
|
|
|
|
/// Return the offset to the `VMCallerCheckedAnyfunc` for the given function
|
|
/// index (either imported or defined).
|
|
pub fn vmctx_anyfunc(&self, index: FuncIndex) -> u32 {
|
|
self.vmctx_anyfuncs_begin()
|
|
.checked_add(
|
|
index
|
|
.as_u32()
|
|
.checked_mul(u32::from(self.size_of_vmcaller_checked_anyfunc()))
|
|
.unwrap(),
|
|
)
|
|
.unwrap()
|
|
}
|
|
|
|
/// Return the offset to the `body` field in `*const VMFunctionBody` index `index`.
|
|
pub fn vmctx_vmfunction_import_body(&self, index: FuncIndex) -> u32 {
|
|
self.vmctx_vmfunction_import(index)
|
|
.checked_add(u32::from(self.vmfunction_import_body()))
|
|
.unwrap()
|
|
}
|
|
|
|
/// Return the offset to the `vmctx` field in `*const VMFunctionBody` index `index`.
|
|
pub fn vmctx_vmfunction_import_vmctx(&self, index: FuncIndex) -> u32 {
|
|
self.vmctx_vmfunction_import(index)
|
|
.checked_add(u32::from(self.vmfunction_import_vmctx()))
|
|
.unwrap()
|
|
}
|
|
|
|
/// Return the offset to the `from` field in `VMTableImport` index `index`.
|
|
pub fn vmctx_vmtable_import_from(&self, index: TableIndex) -> u32 {
|
|
self.vmctx_vmtable_import(index)
|
|
.checked_add(u32::from(self.vmtable_import_from()))
|
|
.unwrap()
|
|
}
|
|
|
|
/// Return the offset to the `base` field in `VMTableDefinition` index `index`.
|
|
pub fn vmctx_vmtable_definition_base(&self, index: DefinedTableIndex) -> u32 {
|
|
self.vmctx_vmtable_definition(index)
|
|
.checked_add(u32::from(self.vmtable_definition_base()))
|
|
.unwrap()
|
|
}
|
|
|
|
/// Return the offset to the `current_elements` field in `VMTableDefinition` index `index`.
|
|
pub fn vmctx_vmtable_definition_current_elements(&self, index: DefinedTableIndex) -> u32 {
|
|
self.vmctx_vmtable_definition(index)
|
|
.checked_add(u32::from(self.vmtable_definition_current_elements()))
|
|
.unwrap()
|
|
}
|
|
|
|
/// Return the offset to the `from` field in `VMMemoryImport` index `index`.
|
|
pub fn vmctx_vmmemory_import_from(&self, index: MemoryIndex) -> u32 {
|
|
self.vmctx_vmmemory_import(index)
|
|
.checked_add(u32::from(self.vmmemory_import_from()))
|
|
.unwrap()
|
|
}
|
|
|
|
/// Return the offset to the `vmctx` field in `VMMemoryImport` index `index`.
|
|
pub fn vmctx_vmmemory_import_vmctx(&self, index: MemoryIndex) -> u32 {
|
|
self.vmctx_vmmemory_import(index)
|
|
.checked_add(u32::from(self.vmmemory_import_vmctx()))
|
|
.unwrap()
|
|
}
|
|
|
|
/// Return the offset to the `base` field in `VMMemoryDefinition` index `index`.
|
|
pub fn vmctx_vmmemory_definition_base(&self, index: DefinedMemoryIndex) -> u32 {
|
|
self.vmctx_vmmemory_definition(index)
|
|
.checked_add(u32::from(self.vmmemory_definition_base()))
|
|
.unwrap()
|
|
}
|
|
|
|
/// Return the offset to the `current_length` field in `VMMemoryDefinition` index `index`.
|
|
pub fn vmctx_vmmemory_definition_current_length(&self, index: DefinedMemoryIndex) -> u32 {
|
|
self.vmctx_vmmemory_definition(index)
|
|
.checked_add(u32::from(self.vmmemory_definition_current_length()))
|
|
.unwrap()
|
|
}
|
|
|
|
/// Return the offset to the `from` field in `VMGlobalImport` index `index`.
|
|
pub fn vmctx_vmglobal_import_from(&self, index: GlobalIndex) -> u32 {
|
|
self.vmctx_vmglobal_import(index)
|
|
.checked_add(u32::from(self.vmglobal_import_from()))
|
|
.unwrap()
|
|
}
|
|
|
|
/// Return the offset to builtin function in `VMBuiltinFunctionsArray` index `index`.
|
|
pub fn vmctx_builtin_function(&self, index: BuiltinFunctionIndex) -> u32 {
|
|
self.vmctx_builtin_functions_begin()
|
|
.checked_add(
|
|
index
|
|
.index()
|
|
.checked_mul(u32::from(self.pointer_size))
|
|
.unwrap(),
|
|
)
|
|
.unwrap()
|
|
}
|
|
}
|
|
|
|
/// Offsets for `VMExternData`.
|
|
impl VMOffsets {
|
|
/// Return the offset for `VMExternData::ref_count`.
|
|
pub fn vm_extern_data_ref_count() -> u32 {
|
|
0
|
|
}
|
|
}
|
|
|
|
/// Offsets for `VMExternRefActivationsTable`.
|
|
impl VMOffsets {
|
|
/// Return the offset for `VMExternRefActivationsTable::next`.
|
|
pub fn vm_extern_ref_activation_table_next(&self) -> u32 {
|
|
0
|
|
}
|
|
|
|
/// Return the offset for `VMExternRefActivationsTable::end`.
|
|
pub fn vm_extern_ref_activation_table_end(&self) -> u32 {
|
|
self.pointer_size.into()
|
|
}
|
|
}
|
|
|
|
/// Target specific type for shared signature index.
|
|
#[derive(Debug, Copy, Clone)]
|
|
pub struct TargetSharedSignatureIndex(u32);
|
|
|
|
impl TargetSharedSignatureIndex {
|
|
/// Constructs `TargetSharedSignatureIndex`.
|
|
pub fn new(value: u32) -> Self {
|
|
Self(value)
|
|
}
|
|
|
|
/// Returns index value.
|
|
pub fn index(self) -> u32 {
|
|
self.0
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use crate::vmoffsets::align;
|
|
|
|
#[test]
|
|
fn alignment() {
|
|
fn is_aligned(x: u32) -> bool {
|
|
x % 16 == 0
|
|
}
|
|
assert!(is_aligned(align(0, 16)));
|
|
assert!(is_aligned(align(32, 16)));
|
|
assert!(is_aligned(align(33, 16)));
|
|
assert!(is_aligned(align(31, 16)));
|
|
}
|
|
}
|