1b36a2e3f4
This is an improvement to #76, which added support for asm.js symbol maps. This PR expands this to also work for emscripten's WebAssembly symbol maps too. This currently only works in Firefox. Chrome would need to fix https://crbug.com/863205 for this to be useful in Chrome.
40 lines
1.3 KiB
TypeScript
40 lines
1.3 KiB
TypeScript
type EmscriptenSymbolMap = Map<string, string>
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// This imports symbol maps generated by emscripten using the "--emit-symbol-map" flag.
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// It allows you to visualize a profile captured in a release build as long as you also
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// have the associated symbol map. To do this, first drop the profile into speedscope
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// and then drop the symbol map. After the second drop, the symbols will be remapped to
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// their original names.
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export function importEmscriptenSymbolMap(contents: string): EmscriptenSymbolMap | null {
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const lines = contents.split('\n')
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if (!lines.length) return null
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// Remove a trailing blank line if there is one
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if (lines[lines.length - 1] === '') lines.pop()
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if (!lines.length) return null
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const map: EmscriptenSymbolMap = new Map()
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const intRegex = /^(\d+):([\$\w]+)$/
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const idRegex = /^([\$\w]+):([\$\w]+)$/
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for (const line of lines) {
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// Match lines like "103:__ZN8tinyxml210XMLCommentD0Ev"
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const intMatch = intRegex.exec(line)
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if (intMatch) {
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map.set(`wasm-function[${intMatch[1]}]`, intMatch[2])
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continue
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}
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// Match lines like "u6:__ZN8tinyxml210XMLCommentD0Ev"
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const idMatch = idRegex.exec(line)
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if (idMatch) {
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map.set(idMatch[1], idMatch[2])
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continue
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}
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return null
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}
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return map
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}
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