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refactor: snapshotting (#3753)

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Bartek Iwańczuk 2020-01-22 23:58:13 +01:00 • committed by GitHub
parent bd9561f4de
commit 63293a90e1
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7 changed files with 155 additions and 143 deletions
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22
cli/js/compiler_util.ts
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@ -7,7 +7,8 @@ import { ConfigureResponse, Host } from "./compiler_host.ts";
import { SourceFile } from "./compiler_sourcefile.ts";
import { sendSync } from "./dispatch_json.ts";
import * as dispatch from "./dispatch.ts";
import { TextEncoder } from "./text_encoding.ts";
import { TextDecoder, TextEncoder } from "./text_encoding.ts";
import { core } from "./core.ts";
import * as util from "./util.ts";
import { assert } from "./util.ts";
import { writeFileSync } from "./write_file.ts";
@ -89,12 +90,27 @@ function cache(
assert(false, `Trying to cache unhandled file type "${emittedFileName}"`);
}
}
const encoder = new TextEncoder();
/**
* This op is called only during snapshotting.
*
* We really don't want to depend on JSON dispatch
* during snapshotting, so this op exchanges strings with Rust
* as raw byte arrays.
*/
export function getAsset(name: string): string {
const encoder = new TextEncoder();
const decoder = new TextDecoder();
const sourceCodeBytes = core.dispatch(
dispatch.OP_FETCH_ASSET,
encoder.encode(name)
);
return decoder.decode(sourceCodeBytes!);
}
/** Generates a `writeFile` function which can be passed to the compiler `Host`
* to use when emitting files. */
export function createWriteFile(state: WriteFileState): WriteFileCallback {
const encoder = new TextEncoder();
if (state.type === CompilerRequestType.Compile) {
return function writeFile(
fileName: string,