3b7cb6ee64
* Enable jitdump profiling support by default This the result of some of the investigation I was doing for #1017. I've done a number of refactorings here which culminated in a number of changes that all amount to what I think should result in jitdump support being enabled by default: * Pass in a list of finished functions instead of just a range to ensure that we're emitting jit dump data for a specific module rather than a whole `CodeMemory` which may have other modules. * Define `ProfilingStrategy` in the `wasmtime` crate to have everything locally-defined * Add support to the C API to enable profiling * Documentation added for profiling with jitdump to the book * Split out supported/unsupported files in `jitdump.rs` to avoid having lots of `#[cfg]`. * Make dependencies optional that are only used for `jitdump`. * Move initialization up-front to `JitDumpAgent::new()` instead of deferring it to the first module. * Pass around `Arc<dyn ProfilingAgent>` instead of `Option<Arc<Mutex<Box<dyn ProfilingAgent>>>>` The `jitdump` Cargo feature is now enabled by default which means that our published binaries, C API artifacts, and crates will support profiling at runtime by default. The support I don't think is fully fleshed out and working but I think it's probably in a good enough spot we can get users playing around with it!
34 lines
872 B
Rust
34 lines
872 B
Rust
use crate::ProfilingAgent;
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use anyhow::{bail, Result};
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use wasmtime_environ::entity::PrimaryMap;
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use wasmtime_environ::wasm::DefinedFuncIndex;
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use wasmtime_environ::Module;
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use wasmtime_runtime::VMFunctionBody;
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/// Interface for driving the creation of jitdump files
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#[derive(Debug)]
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pub struct JitDumpAgent {
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_private: (),
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}
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impl JitDumpAgent {
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/// Intialize a JitDumpAgent and write out the header
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pub fn new() -> Result<Self> {
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if cfg!(feature = "jitdump") {
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bail!("jitdump is not supported on this platform");
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} else {
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bail!("jitdump support disabled at compile time");
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}
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}
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}
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impl ProfilingAgent for JitDumpAgent {
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fn module_load(
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&self,
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_module: &Module,
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_functions: &PrimaryMap<DefinedFuncIndex, *mut [VMFunctionBody]>,
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_dbg_image: Option<&[u8]>,
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) {
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}
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}
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