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Removes api.ImportRenamer for a different approach to "env" (#680)

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Before, we introduced a type `api.ImportRenamer` to resolve conflicts
where the "env" module was shared between AssemblyScript and
user-defined functions. This API was never used in GitHub, and is
complicated.

AssemblyScript also isn't the only ABI to share the "env" module, as
other web APIs like Emscripten do also. The less complicated approach is
to have packages that need to share "env" use
`ModuleBuilder.ExportFunctions` instead, and use namespaces as needed if
there is overlap.

Signed-off-by: Adrian Cole <adrian@tetrate.io>
This commit is contained in:
Crypt Keeper
2022-07-11 14:57:26 +08:00
committed by GitHub
parent 09a8aa6030
commit 14d892d310
14 changed files with 322 additions and 493 deletions
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27
api/wasm.go
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@@ -409,33 +409,6 @@ func DecodeF64(input uint64) float64 {
return math.Float64frombits(input)
}
// ImportRenamer applies during compilation after a module has been decoded from wasm, but before it is instantiated.
//
// For example, you may have a module like below, but the exported functions are in two different modules:
// (import "js" "increment" (func $increment (result i32)))
// (import "js" "decrement" (func $decrement (result i32)))
// (import "js" "wasm_increment" (func $wasm_increment (result i32)))
// (import "js" "wasm_decrement" (func $wasm_decrement (result i32)))
//
// The below breaks up the imports: "increment" and "decrement" from the module "go" and other functions from "wasm":
// renamer := func(externType api.ExternType, oldModule, oldName string) (string, string) {
// if externType != api.ExternTypeFunc {
// return oldModule, oldName
// }
// switch oldName {
// case "increment", "decrement": return "go", oldName
// default: return "wasm", oldName
// }
// }
//
// The resulting CompiledModule imports will look identical to this:
// (import "go" "increment" (func $increment (result i32)))
// (import "go" "decrement" (func $decrement (result i32)))
// (import "wasm" "wasm_increment" (func $wasm_increment (result i32)))
// (import "wasm" "wasm_decrement" (func $wasm_decrement (result i32)))
//
type ImportRenamer func(externType ExternType, oldModule, oldName string) (newModule, newName string)
// MemorySizer applies during compilation after a module has been decoded from wasm, but before it is instantiated.
// This determines the amount of memory pages (65536 bytes per page) to use when a memory is instantiated as a []byte.
//