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75 lines
3.5 KiB
Go
75 lines
3.5 KiB
Go
package wasm
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import (
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"context"
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"github.com/tetratelabs/wazero/api"
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"github.com/tetratelabs/wazero/experimental"
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)
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// Engine is a Store-scoped mechanism to compile functions declared or imported by a module.
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// This is a top-level type implemented by an interpreter or compiler.
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type Engine interface {
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// Close closes this engine, and releases all the compiled cache.
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Close() (err error)
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// CompileModule implements the same method as documented on wasm.Engine.
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CompileModule(ctx context.Context, module *Module, listeners []experimental.FunctionListener, ensureTermination bool) error
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// CompiledModuleCount is exported for testing, to track the size of the compilation cache.
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CompiledModuleCount() uint32
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// DeleteCompiledModule releases compilation caches for the given module (source).
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// Note: it is safe to call this function for a module from which module instances are instantiated even when these
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// module instances have outstanding calls.
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DeleteCompiledModule(module *Module)
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// NewModuleEngine compiles down the function instances in a module, and returns ModuleEngine for the module.
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//
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// * module is the source module from which moduleFunctions are instantiated. This is used for caching.
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// * instance is the *ModuleInstance which is created from `module`.
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//
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// Note: Input parameters must be pre-validated with wasm.Module Validate, to ensure no fields are invalid
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// due to reasons such as out-of-bounds.
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NewModuleEngine(module *Module, instance *ModuleInstance) (ModuleEngine, error)
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}
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// ModuleEngine implements function calls for a given module.
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type ModuleEngine interface {
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// DoneInstantiation is called at the end of the instantiation of the module.
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DoneInstantiation()
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// NewFunction returns an api.Function for the given function pointed by the given Index.
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NewFunction(index Index) api.Function
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// ResolveImportedFunction is used to add imported functions needed to make this ModuleEngine fully functional.
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// - `index` is the function Index of this imported function.
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// - `indexInImportedModule` is the function Index of the imported function in the imported module.
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// - `importedModuleEngine` is the ModuleEngine for the imported ModuleInstance.
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ResolveImportedFunction(index, indexInImportedModule Index, importedModuleEngine ModuleEngine)
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// ResolveImportedMemory is called when this module imports a memory from another module.
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ResolveImportedMemory(importedModuleEngine ModuleEngine)
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// LookupFunction returns the FunctionModule and the Index of the function in the returned ModuleInstance at the given offset in the table.
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LookupFunction(t *TableInstance, typeId FunctionTypeID, tableOffset Index) (*ModuleInstance, Index)
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// GetGlobalValue returns the value of the global variable at the given Index.
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// Only called when OwnsGlobals() returns true, and must not be called for imported globals
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GetGlobalValue(idx Index) (lo, hi uint64)
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// SetGlobalValue sets the value of the global variable at the given Index.
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// Only called when OwnsGlobals() returns true, and must not be called for imported globals
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SetGlobalValue(idx Index, lo, hi uint64)
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// OwnsGlobals returns true if this ModuleEngine owns the global variables. If true, wasm.GlobalInstance's Val,ValHi should
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// not be accessed directly.
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OwnsGlobals() bool
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// FunctionInstanceReference returns Reference for the given Index for a FunctionInstance. The returned values are used by
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// the initialization via ElementSegment.
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FunctionInstanceReference(funcIndex Index) Reference
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// MemoryGrown notifies the engine that the memory has grown.
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MemoryGrown()
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}
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