wasmtime_cli/commands/
explore.rs

1//! The module that implements the `wasmtime explore` command.
2
3use anyhow::{Context, Result};
4use clap::Parser;
5use std::{borrow::Cow, path::PathBuf};
6use tempfile::tempdir;
7use wasmtime::Strategy;
8use wasmtime_cli_flags::CommonOptions;
9
10/// Explore the compilation of a WebAssembly module to native code.
11#[derive(Parser)]
12pub struct ExploreCommand {
13    #[command(flatten)]
14    common: CommonOptions,
15
16    /// The path of the WebAssembly module to compile
17    #[arg(required = true, value_name = "MODULE")]
18    module: PathBuf,
19
20    /// The path of the explorer output (derived from the MODULE name if none
21    /// provided)
22    #[arg(short, long)]
23    output: Option<PathBuf>,
24}
25
26impl ExploreCommand {
27    /// Executes the command.
28    pub fn execute(mut self) -> Result<()> {
29        self.common.init_logging()?;
30
31        let mut config = self.common.config(None)?;
32
33        let bytes =
34            Cow::Owned(std::fs::read(&self.module).with_context(|| {
35                format!("failed to read Wasm module: {}", self.module.display())
36            })?);
37        #[cfg(feature = "wat")]
38        let bytes = wat::parse_bytes(&bytes).map_err(|mut e| {
39            e.set_path(&self.module);
40            e
41        })?;
42
43        let output = self
44            .output
45            .clone()
46            .unwrap_or_else(|| self.module.with_extension("explore.html"));
47        let output_file = std::fs::File::create(&output)
48            .with_context(|| format!("failed to create file: {}", output.display()))?;
49        let mut output_file = std::io::BufWriter::new(output_file);
50
51        let clif_dir = if let Some(Strategy::Cranelift) | None = self.common.codegen.compiler {
52            let clif_dir = tempdir()?;
53            config.emit_clif(clif_dir.path());
54            config.cache(None); // cache does not emit clif
55            Some(clif_dir)
56        } else {
57            None
58        };
59
60        wasmtime_explorer::generate(
61            &config,
62            self.common.target.as_deref(),
63            clif_dir.as_ref().map(|tmp_dir| tmp_dir.path()),
64            &bytes,
65            &mut output_file,
66        )?;
67
68        println!("Exploration written to {}", output.display());
69        Ok(())
70    }
71}
wasmtime_cli/commands/explore.rs

wasmtime_cli/commands/
explore.rs
