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add BLAZINGLY FAST logs

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Toshit Chawda 2025-03-06 20:13:55 -08:00
parent f15cf568c1
commit 9b0af07516
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GPG key ID: 91480ED99E2B3D9D
1 changed files with 87 additions and 65 deletions
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152
src/client/shared/sourcemaps.ts
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@ -1,5 +1,5 @@
import { $scramjet, flagEnabled } from "../../scramjet"; import { flagEnabled } from "../../scramjet";
import { ScramjetClient } from "../client"; import { ProxyCtx, ScramjetClient } from "../client";
enum RewriteType { enum RewriteType {
Insert = 0, Insert = 0,
@ -29,6 +29,77 @@ function getEnd(rewrite: Rewrite): number {
throw "unreachable"; throw "unreachable";
} }
const scramtag_ident = "/*scramtag ";
function doUnrewrite(ctx: ProxyCtx) {
let stringified: string = ctx.fn.call(ctx.this);
// every function rewritten will have a scramtag comment
// it will look like this:
// function name() /*scramtag [index] [tag] */ { ... }
const scramtagstart = stringified.indexOf("/*s");
if (scramtagstart === -1) return ctx.return(stringified); // it's either a native function or something stolen from scramjet itself
const firstspace = stringified.indexOf(
" ",
scramtagstart + scramtag_ident.length
);
// [index] holds the index of the first character in the scramtag (/)
const abstagindex = parseInt(
stringified.substring(scramtagstart + scramtag_ident.length, firstspace)
);
// subtracting that from the index of the scramtag gives us the starting index of the function relative to the entire file
const absindex = abstagindex - scramtagstart;
const endindex = absindex + stringified.length;
const scramtagend = stringified.indexOf("*/", scramtagstart);
const tag = stringified.substring(firstspace + 1, scramtagend);
const rewrites = sourcemaps[tag];
if (!rewrites) {
console.warn("failed to get rewrites for tag", tag);
return ctx.return(stringified);
}
let i = 0;
// skip all rewrites in the file before the fn
while (i < rewrites.length) {
if (rewrites[i].start < absindex) i++;
else break;
}
let end = i;
while (end < rewrites.length) {
if (getEnd(rewrites[end]) < endindex) end++;
else break;
}
const fnrewrites = rewrites.slice(i, end);
let newString = "";
let lastpos = absindex;
for (const rewrite of fnrewrites) {
newString += stringified.slice(lastpos, rewrite.start);
if (rewrite.type === RewriteType.Insert) {
lastpos = rewrite.start + rewrite.size;
} else if (rewrite.type === RewriteType.Replace) {
newString += rewrite.str;
lastpos = rewrite.end;
} else {
throw "unreachable";
}
}
newString += stringified.slice(lastpos);
return ctx.return(newString);
}
const sourcemaps: Record<string, Rewrite[]> = {}; const sourcemaps: Record<string, Rewrite[]> = {};
export const enabled = (client: ScramjetClient) => export const enabled = (client: ScramjetClient) =>
@ -84,78 +155,29 @@ export default function (client: ScramjetClient, self: Self) {
} }
); );
const scramtag_ident = "/*scramtag ";
// when we rewrite javascript it will make function.toString leak internals // when we rewrite javascript it will make function.toString leak internals
// this can lead to double rewrites which is bad // this can lead to double rewrites which is bad
client.Proxy("Function.prototype.toString", { client.Proxy("Function.prototype.toString", {
apply(ctx) { apply(ctx) {
let stringified: string = ctx.fn.call(ctx.this); const before = performance.now();
doUnrewrite(ctx);
const after = performance.now();
// every function rewritten will have a scramtag comment const duration = after - before;
// it will look like this:
// function name() /*scramtag [index] [tag] */ { ... }
const scramtagstart = stringified.indexOf("/*s");
if (scramtagstart === -1) return ctx.return(stringified); // it's either a native function or something stolen from scramjet itself if (flagEnabled("rewriterLogs", new URL(location.href))) {
let timespan: string;
const firstspace = stringified.indexOf( if (duration < 1) {
" ", timespan = "BLAZINGLY FAST";
scramtagstart + scramtag_ident.length } else if (duration < 500) {
); timespan = "decent speed";
// [index] holds the index of the first character in the scramtag (/)
const abstagindex = parseInt(
stringified.substring(scramtagstart + scramtag_ident.length, firstspace)
);
// subtracting that from the index of the scramtag gives us the starting index of the function relative to the entire file
const absindex = abstagindex - scramtagstart;
const endindex = absindex + stringified.length;
const scramtagend = stringified.indexOf("*/", scramtagstart);
const tag = stringified.substring(firstspace + 1, scramtagend);
const rewrites = sourcemaps[tag];
if (!rewrites) {
console.warn("failed to get rewrites for tag", tag);
return ctx.return(stringified);
}
let i = 0;
// skip all rewrites in the file before the fn
while (i < rewrites.length) {
if (rewrites[i].start < absindex) i++;
else break;
}
let end = i;
while (end < rewrites.length) {
if (getEnd(rewrites[end]) < endindex) end++;
else break;
}
const fnrewrites = rewrites.slice(i, end);
let newString = "";
let lastpos = absindex;
for (const rewrite of fnrewrites) {
newString += stringified.slice(lastpos, rewrite.start);
if (rewrite.type === RewriteType.Insert) {
lastpos = rewrite.start + rewrite.size;
} else if (rewrite.type === RewriteType.Replace) {
newString += rewrite.str;
lastpos = rewrite.end;
} else { } else {
throw "unreachable"; timespan = "really slow";
} }
console.log(
`js unrewrite for function was ${timespan} (${duration.toFixed(2)}ms)`
);
} }
newString += stringified.slice(lastpos);
return ctx.return(newString);
}, },
}); });
} }