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JavaScript: source that eval and Function compile takes fuel before it is parsed

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Direct and indirect eval, Function and host evaluators parsed and compiled
their source before taking any fuel or checking the heap, so a script with a
small fuel limit could make the interpreter parse megabytes of source in a
handful of instructions. Interp::prepare_source now takes one unit of fuel for
each UTF-16 code unit and checks that the source text fits in the heap before
the source is flattened, parsed or compiled. A host evaluator's string takes
the fuel for a third of its bytes before it is encoded, and the rest after.

Limits::fuel and the maxFuel row in docs/mcp.md say so.
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dotCooCoo
2026-11-11 19:52:06 -08:00
parent 6b8be09699
commit d151f3f5d0
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docs/mcp.md
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@@ -1826,7 +1826,7 @@ VectorCraft sets these limits itself:
| Included and evaluated files | 64 in all, 16 levels deep, 1,024 paths looked up |
| Heap | 256 MiB (128 MiB on the web) |
| Host calls | 2,000,000 |
| `maxFuel`, instructions in all | 1 to 100,000,000,000; 1,000,000,000 by default |
| `maxFuel`, instructions in all, plus one for each UTF-16 code unit of source that `eval`, `Function` or an evaluated file compiles during the run | 1 to 100,000,000,000; 1,000,000,000 by default |
| Instructions without a pause | 200,000,000 |
| Nesting depth | 64 levels |
| A value crossing to or from a command | 16 MiB and 1,048,576 entries |