jsc.SamplingProfileStackFrame

interface SamplingProfileStackFrame

• category: string

  The tier the function was running in when sampled: "LLInt", "Baseline", "DFG", or "FTL" for JavaScript functions, or one of the other names from the tier breakdown in SamplingProfile.bytecodes (native functions show up as "Unknown Executable").

• column: number

  1-based column of the sampled location. 4294967295 when unknown.

• flags: number

  1 if the function is part of the JavaScript built into Bun (JavaScriptCore's own builtins and Bun's built-in modules such as node:events), 0 if it is yours.

• inliner?: { category: string; column: number; line: number; location: string; name: string }

  Present when the function had been inlined into another function's optimized code: describes the function it was inlined into and the position in it.

• line: number

  1-based line of the sampled location. 4294967295 when unknown, such as for native functions.

• location: string

  Where in the function the sample landed, as the function's code hash, the tier, and the bytecode index, for example "#A4IKxq:Baseline:bc#78". This is the same notation SamplingProfile.bytecodes uses. "#<nil>:None:<nil>" for native functions.

• name: string

  The function's name, "" for anonymous functions, or "(module)" for a module's top-level code.

• sourceID: number

  Identifies the source file; matches the sourceID of an entry in SamplingProfileStackTraces.sources. 4294967295 for native functions, which have no source.

• sourceURL?: string

  Path or URL of the source file (or the specifier of a built-in module, such as "node:events"), mapped through its source map when it has one. Absent for native functions.