2033906 - Fix wasmExtractCode for lazy tiering

Status: NEW

(Core :: JavaScript: WebAssembly, enhancement, P3)

Description

[Yury Delendik (:yury)]

Currently, wasmExtractCode does not return anything for incomplete tier. It will be nice to have at least incomplete module dump for instrumentation and diagnostics.

Comment 1

[Yury Delendik (:yury)]

Attachment: Bug 2033906 - Make wasmExtractCode work with lazy tiering. r?jseward

Add Code::partialTierCodeBlock() which scans funcStates_ for the first
installed tier-2 CodeBlock. Module::extractCode falls back to it when
hasCompleteTier(Optimized) is false and the requested tier is Optimized.

Comment 2

[Yury Delendik (:yury)]

Attachment: Bug 2033906 - Make wasmExtractCode work with lazy tiering. r?jseward

In lazy tiering each tiered-up function gets its own CodeBlock.
Add Code::allPartialTierCodeBlocks() to collect all distinct installed
tier-2 CodeBlocks, and refactor Module::extractCode to iterate over a
vector of blocks, concatenating their code and adjusting offsets.