wasmtime_cli_flags/
lib.rs

1//! Contains the common Wasmtime command line interface (CLI) flags.
2
3use clap::Parser;
4use serde::Deserialize;
5use std::{
6    fmt, fs,
7    path::{Path, PathBuf},
8    time::Duration,
9};
10use wasmtime::{Config, Result, bail, error::Context as _};
11
12pub mod opt;
13
14#[cfg(feature = "logging")]
15fn init_file_per_thread_logger(prefix: &'static str) {
16    file_per_thread_logger::initialize(prefix);
17    file_per_thread_logger::allow_uninitialized();
18
19    // Extending behavior of default spawner:
20    // https://docs.rs/rayon/1.1.0/rayon/struct.ThreadPoolBuilder.html#method.spawn_handler
21    // Source code says DefaultSpawner is implementation detail and
22    // shouldn't be used directly.
23    #[cfg(feature = "parallel-compilation")]
24    rayon::ThreadPoolBuilder::new()
25        .spawn_handler(move |thread| {
26            let mut b = std::thread::Builder::new();
27            if let Some(name) = thread.name() {
28                b = b.name(name.to_owned());
29            }
30            if let Some(stack_size) = thread.stack_size() {
31                b = b.stack_size(stack_size);
32            }
33            b.spawn(move || {
34                file_per_thread_logger::initialize(prefix);
35                thread.run()
36            })?;
37            Ok(())
38        })
39        .build_global()
40        .unwrap();
41}
42
43wasmtime_option_group! {
44    #[derive(PartialEq, Clone, Deserialize)]
45    #[serde(rename_all = "kebab-case", deny_unknown_fields)]
46    pub struct OptimizeOptions {
47        /// Optimization level of generated code (0-2, s; default: 2)
48        #[serde(default)]
49        #[serde(deserialize_with = "crate::opt::cli_parse_wrapper")]
50        pub opt_level: Option<wasmtime::OptLevel>,
51
52        /// Register allocator algorithm choice.
53        #[serde(default)]
54        #[serde(deserialize_with = "crate::opt::cli_parse_wrapper")]
55        pub regalloc_algorithm: Option<wasmtime::RegallocAlgorithm>,
56
57        /// Do not allow Wasm linear memories to move in the host process's
58        /// address space.
59        pub memory_may_move: Option<bool>,
60
61        /// Initial virtual memory allocation size for memories.
62        pub memory_reservation: Option<u64>,
63
64        /// Bytes to reserve at the end of linear memory for growth into.
65        pub memory_reservation_for_growth: Option<u64>,
66
67        /// Size, in bytes, of guard pages for linear memories.
68        pub memory_guard_size: Option<u64>,
69
70        /// Indicates whether an unmapped region of memory is placed before all
71        /// linear memories.
72        pub guard_before_linear_memory: Option<bool>,
73
74        /// Whether to initialize tables lazily, so that instantiation is
75        /// fast but indirect calls are a little slower. If no, tables are
76        /// initialized eagerly from any active element segments that apply to
77        /// them during instantiation. (default: yes)
78        pub table_lazy_init: Option<bool>,
79
80        /// Enable the pooling allocator, in place of the on-demand allocator.
81        pub pooling_allocator: Option<bool>,
82
83        /// The number of decommits to do per batch. A batch size of 1
84        /// effectively disables decommit batching. (default: 1)
85        pub pooling_decommit_batch_size: Option<usize>,
86
87        /// How many bytes to keep resident between instantiations for the
88        /// pooling allocator in linear memories.
89        pub pooling_memory_keep_resident: Option<usize>,
90
91        /// How many bytes to keep resident between instantiations for the
92        /// pooling allocator in tables.
93        pub pooling_table_keep_resident: Option<usize>,
94
95        /// Enable memory protection keys for the pooling allocator; this can
96        /// optimize the size of memory slots.
97        #[serde(default)]
98        #[serde(deserialize_with = "crate::opt::cli_parse_wrapper")]
99        pub pooling_memory_protection_keys: Option<wasmtime::Enabled>,
100
101        /// Sets an upper limit on how many memory protection keys (MPK) Wasmtime
102        /// will use. (default: 16)
103        pub pooling_max_memory_protection_keys: Option<usize>,
104
105        /// Configure attempting to initialize linear memory via a
106        /// copy-on-write mapping (default: yes)
107        pub memory_init_cow: Option<bool>,
108
109        /// Threshold below which CoW images are guaranteed to be used and be
110        /// dense.
111        pub memory_guaranteed_dense_image_size: Option<u64>,
112
113        /// The maximum number of WebAssembly instances which can be created
114        /// with the pooling allocator.
115        pub pooling_total_core_instances: Option<u32>,
116
117        /// The maximum number of WebAssembly components which can be created
118        /// with the pooling allocator.
119        pub pooling_total_component_instances: Option<u32>,
120
121        /// The maximum number of WebAssembly memories which can be created with
122        /// the pooling allocator.
123        pub pooling_total_memories: Option<u32>,
124
125        /// The maximum number of WebAssembly tables which can be created with
126        /// the pooling allocator.
127        pub pooling_total_tables: Option<u32>,
128
129        /// The maximum number of WebAssembly stacks which can be created with
130        /// the pooling allocator.
131        pub pooling_total_stacks: Option<u32>,
132
133        /// The maximum runtime size of each linear memory in the pooling
134        /// allocator, in bytes.
135        pub pooling_max_memory_size: Option<usize>,
136
137        /// The maximum table elements for any table defined in a module when
138        /// using the pooling allocator.
139        pub pooling_table_elements: Option<usize>,
140
141        /// The maximum size, in bytes, allocated for a core instance's metadata
142        /// when using the pooling allocator.
143        pub pooling_max_core_instance_size: Option<usize>,
144
145        /// Configures the maximum number of "unused warm slots" to retain in the
146        /// pooling allocator. (default: 100)
147        pub pooling_max_unused_warm_slots: Option<u32>,
148
149        /// How much memory, in bytes, to keep resident for async stacks allocated
150        /// with the pooling allocator. (default: 0)
151        pub pooling_async_stack_keep_resident: Option<usize>,
152
153        /// The maximum size, in bytes, allocated for a component instance's
154        /// `VMComponentContext` metadata. (default: 1MiB)
155        pub pooling_max_component_instance_size: Option<usize>,
156
157        /// The maximum number of core instances a single component may contain
158        /// (default is unlimited).
159        pub pooling_max_core_instances_per_component: Option<u32>,
160
161        /// The maximum number of Wasm linear memories that a single component may
162        /// transitively contain (default is unlimited).
163        pub pooling_max_memories_per_component: Option<u32>,
164
165        /// The maximum number of tables that a single component may transitively
166        /// contain (default is unlimited).
167        pub pooling_max_tables_per_component: Option<u32>,
168
169        /// The maximum number of defined tables for a core module. (default: 1)
170        pub pooling_max_tables_per_module: Option<u32>,
171
172        /// The maximum number of defined linear memories for a module. (default: 1)
173        pub pooling_max_memories_per_module: Option<u32>,
174
175        /// The maximum number of concurrent GC heaps supported. (default: 1000)
176        pub pooling_total_gc_heaps: Option<u32>,
177
178        /// Enable or disable the use of host signal handlers for traps.
179        pub signals_based_traps: Option<bool>,
180
181        /// DEPRECATED: Use `-Cmemory-guard-size=N` instead.
182        pub dynamic_memory_guard_size: Option<u64>,
183
184        /// DEPRECATED: Use `-Cmemory-guard-size=N` instead.
185        pub static_memory_guard_size: Option<u64>,
186
187        /// DEPRECATED: Use `-Cmemory-may-move` instead.
188        pub static_memory_forced: Option<bool>,
189
190        /// DEPRECATED: Use `-Cmemory-reservation=N` instead.
191        pub static_memory_maximum_size: Option<u64>,
192
193        /// DEPRECATED: Use `-Cmemory-reservation-for-growth=N` instead.
194        pub dynamic_memory_reserved_for_growth: Option<u64>,
195
196        /// Whether or not `PAGEMAP_SCAN` ioctls are used to reset linear
197        /// memory.
198        #[serde(default)]
199        #[serde(deserialize_with = "crate::opt::cli_parse_wrapper")]
200        pub pooling_pagemap_scan: Option<wasmtime::Enabled>,
201    }
202
203    enum Optimize {
204        ...
205    }
206}
207
208wasmtime_option_group! {
209    #[derive(PartialEq, Clone, Deserialize)]
210    #[serde(rename_all = "kebab-case", deny_unknown_fields)]
211    pub struct CodegenOptions {
212        /// Either `cranelift` or `winch`.
213        ///
214        /// Currently only `cranelift` and `winch` are supported, but not all
215        /// builds of Wasmtime have both built in.
216        #[serde(default)]
217        #[serde(deserialize_with = "crate::opt::cli_parse_wrapper")]
218        pub compiler: Option<wasmtime::Strategy>,
219        /// Which garbage collector to use: `drc` or `null`.
220        ///
221        /// `drc` is the deferred reference-counting collector.
222        ///
223        /// `null` is the null garbage collector, which does not collect any
224        /// garbage.
225        ///
226        /// Note that not all builds of Wasmtime will have support for garbage
227        /// collection included.
228        #[serde(default)]
229        #[serde(deserialize_with = "crate::opt::cli_parse_wrapper")]
230        pub collector: Option<wasmtime::Collector>,
231        /// Enable Cranelift's internal debug verifier (expensive)
232        pub cranelift_debug_verifier: Option<bool>,
233        /// Whether or not to enable caching of compiled modules.
234        pub cache: Option<bool>,
235        /// Configuration for compiled module caching.
236        pub cache_config: Option<String>,
237        /// Whether or not to enable parallel compilation of modules.
238        pub parallel_compilation: Option<bool>,
239        /// Whether to enable proof-carrying code (PCC)-based validation.
240        pub pcc: Option<bool>,
241        /// Controls whether native unwind information is present in compiled
242        /// object files.
243        pub native_unwind_info: Option<bool>,
244
245        /// Whether to perform function inlining during compilation.
246        pub inlining: Option<bool>,
247
248        #[prefixed = "cranelift"]
249        #[serde(default)]
250        /// Set a cranelift-specific option. Use `wasmtime settings` to see
251        /// all.
252        pub cranelift: Vec<(String, Option<String>)>,
253    }
254
255    enum Codegen {
256        ...
257    }
258}
259
260wasmtime_option_group! {
261    #[derive(PartialEq, Clone, Deserialize)]
262    #[serde(rename_all = "kebab-case", deny_unknown_fields)]
263    pub struct DebugOptions {
264        /// Enable generation of DWARF debug information in compiled code.
265        pub debug_info: Option<bool>,
266        /// Enable guest debugging insrumentation.
267        pub guest_debug: Option<bool>,
268        /// Configure whether compiled code can map native addresses to wasm.
269        pub address_map: Option<bool>,
270        /// Configure whether logging is enabled.
271        pub logging: Option<bool>,
272        /// Configure whether logs are emitted to files
273        pub log_to_files: Option<bool>,
274        /// Enable coredump generation to this file after a WebAssembly trap.
275        pub coredump: Option<String>,
276    }
277
278    enum Debug {
279        ...
280    }
281}
282
283wasmtime_option_group! {
284    #[derive(PartialEq, Clone, Deserialize)]
285    #[serde(rename_all = "kebab-case", deny_unknown_fields)]
286    pub struct WasmOptions {
287        /// Enable canonicalization of all NaN values.
288        pub nan_canonicalization: Option<bool>,
289        /// Enable execution fuel with N units fuel, trapping after running out
290        /// of fuel.
291        ///
292        /// Most WebAssembly instructions consume 1 unit of fuel. Some
293        /// instructions, such as `nop`, `drop`, `block`, and `loop`, consume 0
294        /// units, as any execution cost associated with them involves other
295        /// instructions which do consume fuel.
296        pub fuel: Option<u64>,
297        /// Yield when a global epoch counter changes, allowing for async
298        /// operation without blocking the executor.
299        pub epoch_interruption: Option<bool>,
300        /// Maximum stack size, in bytes, that wasm is allowed to consume before a
301        /// stack overflow is reported.
302        pub max_wasm_stack: Option<usize>,
303        /// Stack size, in bytes, that will be allocated for async stacks.
304        ///
305        /// Note that this must be larger than `max-wasm-stack` and the
306        /// difference between the two is how much stack the host has to execute
307        /// on.
308        pub async_stack_size: Option<usize>,
309        /// Configures whether or not stacks used for async futures are zeroed
310        /// before (re)use as a defense-in-depth mechanism. (default: false)
311        pub async_stack_zeroing: Option<bool>,
312        /// Allow unknown exports when running commands.
313        pub unknown_exports_allow: Option<bool>,
314        /// Allow the main module to import unknown functions, using an
315        /// implementation that immediately traps, when running commands.
316        pub unknown_imports_trap: Option<bool>,
317        /// Allow the main module to import unknown functions, using an
318        /// implementation that returns default values, when running commands.
319        pub unknown_imports_default: Option<bool>,
320        /// Enables memory error checking. (see wmemcheck.md for more info)
321        pub wmemcheck: Option<bool>,
322        /// Maximum size, in bytes, that a linear memory is allowed to reach.
323        ///
324        /// Growth beyond this limit will cause `memory.grow` instructions in
325        /// WebAssembly modules to return -1 and fail.
326        pub max_memory_size: Option<usize>,
327        /// Maximum size, in table elements, that a table is allowed to reach.
328        pub max_table_elements: Option<usize>,
329        /// Maximum number of WebAssembly instances allowed to be created.
330        pub max_instances: Option<usize>,
331        /// Maximum number of WebAssembly tables allowed to be created.
332        pub max_tables: Option<usize>,
333        /// Maximum number of WebAssembly linear memories allowed to be created.
334        pub max_memories: Option<usize>,
335        /// Force a trap to be raised on `memory.grow` and `table.grow` failure
336        /// instead of returning -1 from these instructions.
337        ///
338        /// This is not necessarily a spec-compliant option to enable but can be
339        /// useful for tracking down a backtrace of what is requesting so much
340        /// memory, for example.
341        pub trap_on_grow_failure: Option<bool>,
342        /// Maximum execution time of wasm code before timing out (1, 2s, 100ms, etc)
343        pub timeout: Option<Duration>,
344        /// Configures support for all WebAssembly proposals implemented.
345        pub all_proposals: Option<bool>,
346        /// Configure support for the bulk memory proposal.
347        pub bulk_memory: Option<bool>,
348        /// Configure support for the multi-memory proposal.
349        pub multi_memory: Option<bool>,
350        /// Configure support for the multi-value proposal.
351        pub multi_value: Option<bool>,
352        /// Configure support for the reference-types proposal.
353        pub reference_types: Option<bool>,
354        /// Configure support for the simd proposal.
355        pub simd: Option<bool>,
356        /// Configure support for the relaxed-simd proposal.
357        pub relaxed_simd: Option<bool>,
358        /// Configure forcing deterministic and host-independent behavior of
359        /// the relaxed-simd instructions.
360        ///
361        /// By default these instructions may have architecture-specific behavior as
362        /// allowed by the specification, but this can be used to force the behavior
363        /// of these instructions to match the deterministic behavior classified in
364        /// the specification. Note that enabling this option may come at a
365        /// performance cost.
366        pub relaxed_simd_deterministic: Option<bool>,
367        /// Configure support for the tail-call proposal.
368        pub tail_call: Option<bool>,
369        /// Configure support for the threads proposal.
370        pub threads: Option<bool>,
371        /// Configure the ability to create a `shared` memory.
372        pub shared_memory: Option<bool>,
373        /// Configure support for the shared-everything-threads proposal.
374        pub shared_everything_threads: Option<bool>,
375        /// Configure support for the memory64 proposal.
376        pub memory64: Option<bool>,
377        /// Configure support for the component-model proposal.
378        pub component_model: Option<bool>,
379        /// Component model support for async lifting/lowering.
380        pub component_model_async: Option<bool>,
381        /// Component model support for async lifting/lowering: this corresponds
382        /// to the 🚝 emoji in the component model specification.
383        pub component_model_async_builtins: Option<bool>,
384        /// Component model support for async lifting/lowering: this corresponds
385        /// to the 🚟 emoji in the component model specification.
386        pub component_model_async_stackful: Option<bool>,
387        /// Component model support for threading: this corresponds
388        /// to the 🧵 emoji in the component model specification.
389        pub component_model_threading: Option<bool>,
390        /// Component model support for `error-context`: this corresponds
391        /// to the 📝 emoji in the component model specification.
392        pub component_model_error_context: Option<bool>,
393        /// GC support in the component model: this corresponds to the 🛸 emoji
394        /// in the component model specification.
395        pub component_model_gc: Option<bool>,
396        /// Configure support for the function-references proposal.
397        pub function_references: Option<bool>,
398        /// Configure support for the stack-switching proposal.
399        pub stack_switching: Option<bool>,
400        /// Configure support for the GC proposal.
401        pub gc: Option<bool>,
402        /// Configure support for the custom-page-sizes proposal.
403        pub custom_page_sizes: Option<bool>,
404        /// Configure support for the wide-arithmetic proposal.
405        pub wide_arithmetic: Option<bool>,
406        /// Configure support for the extended-const proposal.
407        pub extended_const: Option<bool>,
408        /// Configure support for the exceptions proposal.
409        pub exceptions: Option<bool>,
410        /// Whether or not any GC infrastructure in Wasmtime is enabled or not.
411        pub gc_support: Option<bool>,
412        /// Component model support for fixed-length lists: this corresponds
413        /// to the 🔧 emoji in the component model specification
414        pub component_model_fixed_length_lists: Option<bool>,
415    }
416
417    enum Wasm {
418        ...
419    }
420}
421
422wasmtime_option_group! {
423    #[derive(PartialEq, Clone, Deserialize)]
424    #[serde(rename_all = "kebab-case", deny_unknown_fields)]
425    pub struct WasiOptions {
426        /// Enable support for WASI CLI APIs, including filesystems, sockets, clocks, and random.
427        pub cli: Option<bool>,
428        /// Enable WASI APIs marked as: @unstable(feature = cli-exit-with-code)
429        pub cli_exit_with_code: Option<bool>,
430        /// Deprecated alias for `cli`
431        pub common: Option<bool>,
432        /// Enable support for WASI neural network imports (experimental)
433        pub nn: Option<bool>,
434        /// Enable support for WASI threading imports (experimental). Implies preview2=false.
435        pub threads: Option<bool>,
436        /// Enable support for WASI HTTP imports
437        pub http: Option<bool>,
438        /// Number of distinct write calls to the outgoing body's output-stream
439        /// that the implementation will buffer.
440        /// Default: 1.
441        pub http_outgoing_body_buffer_chunks: Option<usize>,
442        /// Maximum size allowed in a write call to the outgoing body's output-stream.
443        /// Default: 1024 * 1024.
444        pub http_outgoing_body_chunk_size: Option<usize>,
445        /// Enable support for WASI config imports (experimental)
446        pub config: Option<bool>,
447        /// Enable support for WASI key-value imports (experimental)
448        pub keyvalue: Option<bool>,
449        /// Inherit environment variables and file descriptors following the
450        /// systemd listen fd specification (UNIX only) (legacy wasip1
451        /// implementation only)
452        pub listenfd: Option<bool>,
453        /// Grant access to the given TCP listen socket (experimental, legacy
454        /// wasip1 implementation only)
455        #[serde(default)]
456        pub tcplisten: Vec<String>,
457        /// Enable support for WASI TLS (Transport Layer Security) imports (experimental)
458        pub tls: Option<bool>,
459        /// Implement WASI Preview1 using new Preview2 implementation (true, default) or legacy
460        /// implementation (false)
461        pub preview2: Option<bool>,
462        /// Pre-load machine learning graphs (i.e., models) for use by wasi-nn.
463        ///
464        /// Each use of the flag will preload a ML model from the host directory
465        /// using the given model encoding. The model will be mapped to the
466        /// directory name: e.g., `--wasi-nn-graph openvino:/foo/bar` will preload
467        /// an OpenVINO model named `bar`. Note that which model encodings are
468        /// available is dependent on the backends implemented in the
469        /// `wasmtime_wasi_nn` crate.
470        #[serde(skip)]
471        pub nn_graph: Vec<WasiNnGraph>,
472        /// Flag for WASI preview2 to inherit the host's network within the
473        /// guest so it has full access to all addresses/ports/etc.
474        pub inherit_network: Option<bool>,
475        /// Indicates whether `wasi:sockets/ip-name-lookup` is enabled or not.
476        pub allow_ip_name_lookup: Option<bool>,
477        /// Indicates whether `wasi:sockets` TCP support is enabled or not.
478        pub tcp: Option<bool>,
479        /// Indicates whether `wasi:sockets` UDP support is enabled or not.
480        pub udp: Option<bool>,
481        /// Enable WASI APIs marked as: @unstable(feature = network-error-code)
482        pub network_error_code: Option<bool>,
483        /// Allows imports from the `wasi_unstable` core wasm module.
484        pub preview0: Option<bool>,
485        /// Inherit all environment variables from the parent process.
486        ///
487        /// This option can be further overwritten with `--env` flags.
488        pub inherit_env: Option<bool>,
489        /// Pass a wasi config variable to the program.
490        #[serde(skip)]
491        pub config_var: Vec<KeyValuePair>,
492        /// Preset data for the In-Memory provider of WASI key-value API.
493        #[serde(skip)]
494        pub keyvalue_in_memory_data: Vec<KeyValuePair>,
495        /// Enable support for WASIp3 APIs.
496        pub p3: Option<bool>,
497    }
498
499    enum Wasi {
500        ...
501    }
502}
503
504#[derive(Debug, Clone, PartialEq)]
505pub struct WasiNnGraph {
506    pub format: String,
507    pub dir: String,
508}
509
510#[derive(Debug, Clone, PartialEq)]
511pub struct KeyValuePair {
512    pub key: String,
513    pub value: String,
514}
515
516/// Common options for commands that translate WebAssembly modules
517#[derive(Parser, Clone, Deserialize)]
518#[serde(deny_unknown_fields)]
519pub struct CommonOptions {
520    // These options groups are used to parse `-O` and such options but aren't
521    // the raw form consumed by the CLI. Instead they're pushed into the `pub`
522    // fields below as part of the `configure` method.
523    //
524    // Ideally clap would support `pub opts: OptimizeOptions` and parse directly
525    // into that but it does not appear to do so for multiple `-O` flags for
526    // now.
527    /// Optimization and tuning related options for wasm performance, `-O help` to
528    /// see all.
529    #[arg(short = 'O', long = "optimize", value_name = "KEY[=VAL[,..]]")]
530    #[serde(skip)]
531    opts_raw: Vec<opt::CommaSeparated<Optimize>>,
532
533    /// Codegen-related configuration options, `-C help` to see all.
534    #[arg(short = 'C', long = "codegen", value_name = "KEY[=VAL[,..]]")]
535    #[serde(skip)]
536    codegen_raw: Vec<opt::CommaSeparated<Codegen>>,
537
538    /// Debug-related configuration options, `-D help` to see all.
539    #[arg(short = 'D', long = "debug", value_name = "KEY[=VAL[,..]]")]
540    #[serde(skip)]
541    debug_raw: Vec<opt::CommaSeparated<Debug>>,
542
543    /// Options for configuring semantic execution of WebAssembly, `-W help` to see
544    /// all.
545    #[arg(short = 'W', long = "wasm", value_name = "KEY[=VAL[,..]]")]
546    #[serde(skip)]
547    wasm_raw: Vec<opt::CommaSeparated<Wasm>>,
548
549    /// Options for configuring WASI and its proposals, `-S help` to see all.
550    #[arg(short = 'S', long = "wasi", value_name = "KEY[=VAL[,..]]")]
551    #[serde(skip)]
552    wasi_raw: Vec<opt::CommaSeparated<Wasi>>,
553
554    // These fields are filled in by the `configure` method below via the
555    // options parsed from the CLI above. This is what the CLI should use.
556    #[arg(skip)]
557    #[serde(skip)]
558    configured: bool,
559
560    #[arg(skip)]
561    #[serde(rename = "optimize", default)]
562    pub opts: OptimizeOptions,
563
564    #[arg(skip)]
565    #[serde(rename = "codegen", default)]
566    pub codegen: CodegenOptions,
567
568    #[arg(skip)]
569    #[serde(rename = "debug", default)]
570    pub debug: DebugOptions,
571
572    #[arg(skip)]
573    #[serde(rename = "wasm", default)]
574    pub wasm: WasmOptions,
575
576    #[arg(skip)]
577    #[serde(rename = "wasi", default)]
578    pub wasi: WasiOptions,
579
580    /// The target triple; default is the host triple
581    #[arg(long, value_name = "TARGET")]
582    #[serde(skip)]
583    pub target: Option<String>,
584
585    /// Use the specified TOML configuration file.
586    /// This TOML configuration file can provide same configuration options as the
587    /// `--optimize`, `--codgen`, `--debug`, `--wasm`, `--wasi` CLI options, with a couple exceptions.
588    ///
589    /// Additional options specified on the command line will take precedent over options loaded from
590    /// this TOML file.
591    #[arg(long = "config", value_name = "FILE")]
592    #[serde(skip)]
593    pub config: Option<PathBuf>,
594}
595
596macro_rules! match_feature {
597    (
598        [$feat:tt : $config:expr]
599        $val:ident => $e:expr,
600        $p:pat => err,
601    ) => {
602        #[cfg(feature = $feat)]
603        {
604            if let Some($val) = $config {
605                $e;
606            }
607        }
608        #[cfg(not(feature = $feat))]
609        {
610            if let Some($p) = $config {
611                bail!(concat!("support for ", $feat, " disabled at compile time"));
612            }
613        }
614    };
615}
616
617impl CommonOptions {
618    /// Creates a blank new set of [`CommonOptions`] that can be configured.
619    pub fn new() -> CommonOptions {
620        CommonOptions {
621            opts_raw: Vec::new(),
622            codegen_raw: Vec::new(),
623            debug_raw: Vec::new(),
624            wasm_raw: Vec::new(),
625            wasi_raw: Vec::new(),
626            configured: true,
627            opts: Default::default(),
628            codegen: Default::default(),
629            debug: Default::default(),
630            wasm: Default::default(),
631            wasi: Default::default(),
632            target: None,
633            config: None,
634        }
635    }
636
637    fn configure(&mut self) -> Result<()> {
638        if self.configured {
639            return Ok(());
640        }
641        self.configured = true;
642        if let Some(toml_config_path) = &self.config {
643            let toml_options = CommonOptions::from_file(toml_config_path)?;
644            self.opts = toml_options.opts;
645            self.codegen = toml_options.codegen;
646            self.debug = toml_options.debug;
647            self.wasm = toml_options.wasm;
648            self.wasi = toml_options.wasi;
649        }
650        self.opts.configure_with(&self.opts_raw);
651        self.codegen.configure_with(&self.codegen_raw);
652        self.debug.configure_with(&self.debug_raw);
653        self.wasm.configure_with(&self.wasm_raw);
654        self.wasi.configure_with(&self.wasi_raw);
655        Ok(())
656    }
657
658    pub fn init_logging(&mut self) -> Result<()> {
659        self.configure()?;
660        if self.debug.logging == Some(false) {
661            return Ok(());
662        }
663        #[cfg(feature = "logging")]
664        if self.debug.log_to_files == Some(true) {
665            let prefix = "wasmtime.dbg.";
666            init_file_per_thread_logger(prefix);
667        } else {
668            use std::io::IsTerminal;
669            use tracing_subscriber::{EnvFilter, FmtSubscriber};
670            let builder = FmtSubscriber::builder()
671                .with_writer(std::io::stderr)
672                .with_env_filter(EnvFilter::from_env("WASMTIME_LOG"))
673                .with_ansi(std::io::stderr().is_terminal());
674            if std::env::var("WASMTIME_LOG_NO_CONTEXT").is_ok_and(|value| value.eq("1")) {
675                builder
676                    .with_level(false)
677                    .with_target(false)
678                    .without_time()
679                    .init()
680            } else {
681                builder.init();
682            }
683        }
684        #[cfg(not(feature = "logging"))]
685        if self.debug.log_to_files == Some(true) || self.debug.logging == Some(true) {
686            bail!("support for logging disabled at compile time");
687        }
688        Ok(())
689    }
690
691    pub fn config(&mut self, pooling_allocator_default: Option<bool>) -> Result<Config> {
692        self.configure()?;
693        let mut config = Config::new();
694
695        match_feature! {
696            ["cranelift" : self.codegen.compiler]
697            strategy => config.strategy(strategy),
698            _ => err,
699        }
700        match_feature! {
701            ["gc" : self.codegen.collector]
702            collector => config.collector(collector),
703            _ => err,
704        }
705        if let Some(target) = &self.target {
706            config.target(target)?;
707        }
708        match_feature! {
709            ["cranelift" : self.codegen.cranelift_debug_verifier]
710            enable => config.cranelift_debug_verifier(enable),
711            true => err,
712        }
713        if let Some(enable) = self.debug.debug_info {
714            config.debug_info(enable);
715        }
716        match_feature! {
717            ["debug" : self.debug.guest_debug]
718            enable => config.guest_debug(enable),
719            _ => err,
720        }
721        if self.debug.coredump.is_some() {
722            #[cfg(feature = "coredump")]
723            config.coredump_on_trap(true);
724            #[cfg(not(feature = "coredump"))]
725            bail!("support for coredumps disabled at compile time");
726        }
727        match_feature! {
728            ["cranelift" : self.opts.opt_level]
729            level => config.cranelift_opt_level(level),
730            _ => err,
731        }
732        match_feature! {
733            ["cranelift": self.opts.regalloc_algorithm]
734            algo => config.cranelift_regalloc_algorithm(algo),
735            _ => err,
736        }
737        match_feature! {
738            ["cranelift" : self.wasm.nan_canonicalization]
739            enable => config.cranelift_nan_canonicalization(enable),
740            true => err,
741        }
742        match_feature! {
743            ["cranelift" : self.codegen.pcc]
744            enable => config.cranelift_pcc(enable),
745            true => err,
746        }
747
748        self.enable_wasm_features(&mut config)?;
749
750        #[cfg(feature = "cranelift")]
751        for (name, value) in self.codegen.cranelift.iter() {
752            let name = name.replace('-', "_");
753            unsafe {
754                match value {
755                    Some(val) => {
756                        config.cranelift_flag_set(&name, val);
757                    }
758                    None => {
759                        config.cranelift_flag_enable(&name);
760                    }
761                }
762            }
763        }
764        #[cfg(not(feature = "cranelift"))]
765        if !self.codegen.cranelift.is_empty() {
766            bail!("support for cranelift disabled at compile time");
767        }
768
769        #[cfg(feature = "cache")]
770        if self.codegen.cache != Some(false) {
771            use wasmtime::Cache;
772            let cache = match &self.codegen.cache_config {
773                Some(path) => Cache::from_file(Some(Path::new(path)))?,
774                None => Cache::from_file(None)?,
775            };
776            config.cache(Some(cache));
777        }
778        #[cfg(not(feature = "cache"))]
779        if self.codegen.cache == Some(true) {
780            bail!("support for caching disabled at compile time");
781        }
782
783        match_feature! {
784            ["parallel-compilation" : self.codegen.parallel_compilation]
785            enable => config.parallel_compilation(enable),
786            true => err,
787        }
788
789        let memory_reservation = self
790            .opts
791            .memory_reservation
792            .or(self.opts.static_memory_maximum_size);
793        if let Some(size) = memory_reservation {
794            config.memory_reservation(size);
795        }
796
797        if let Some(enable) = self.opts.static_memory_forced {
798            config.memory_may_move(!enable);
799        }
800        if let Some(enable) = self.opts.memory_may_move {
801            config.memory_may_move(enable);
802        }
803
804        let memory_guard_size = self
805            .opts
806            .static_memory_guard_size
807            .or(self.opts.dynamic_memory_guard_size)
808            .or(self.opts.memory_guard_size);
809        if let Some(size) = memory_guard_size {
810            config.memory_guard_size(size);
811        }
812
813        let mem_for_growth = self
814            .opts
815            .memory_reservation_for_growth
816            .or(self.opts.dynamic_memory_reserved_for_growth);
817        if let Some(size) = mem_for_growth {
818            config.memory_reservation_for_growth(size);
819        }
820        if let Some(enable) = self.opts.guard_before_linear_memory {
821            config.guard_before_linear_memory(enable);
822        }
823        if let Some(enable) = self.opts.table_lazy_init {
824            config.table_lazy_init(enable);
825        }
826
827        // If fuel has been configured, set the `consume fuel` flag on the config.
828        if self.wasm.fuel.is_some() {
829            config.consume_fuel(true);
830        }
831
832        if let Some(enable) = self.wasm.epoch_interruption {
833            config.epoch_interruption(enable);
834        }
835        if let Some(enable) = self.debug.address_map {
836            config.generate_address_map(enable);
837        }
838        if let Some(enable) = self.opts.memory_init_cow {
839            config.memory_init_cow(enable);
840        }
841        if let Some(size) = self.opts.memory_guaranteed_dense_image_size {
842            config.memory_guaranteed_dense_image_size(size);
843        }
844        if let Some(enable) = self.opts.signals_based_traps {
845            config.signals_based_traps(enable);
846        }
847        if let Some(enable) = self.codegen.native_unwind_info {
848            config.native_unwind_info(enable);
849        }
850        if let Some(enable) = self.codegen.inlining {
851            config.compiler_inlining(enable);
852        }
853
854        // async_stack_size enabled by either async or stack-switching, so
855        // cannot directly use match_feature!
856        #[cfg(any(feature = "async", feature = "stack-switching"))]
857        {
858            if let Some(size) = self.wasm.async_stack_size {
859                config.async_stack_size(size);
860            }
861        }
862        #[cfg(not(any(feature = "async", feature = "stack-switching")))]
863        {
864            if let Some(_size) = self.wasm.async_stack_size {
865                bail!(concat!(
866                    "support for async/stack-switching disabled at compile time"
867                ));
868            }
869        }
870
871        match_feature! {
872            ["pooling-allocator" : self.opts.pooling_allocator.or(pooling_allocator_default)]
873            enable => {
874                if enable {
875                    let mut cfg = wasmtime::PoolingAllocationConfig::default();
876                    if let Some(size) = self.opts.pooling_memory_keep_resident {
877                        cfg.linear_memory_keep_resident(size);
878                    }
879                    if let Some(size) = self.opts.pooling_table_keep_resident {
880                        cfg.table_keep_resident(size);
881                    }
882                    if let Some(limit) = self.opts.pooling_total_core_instances {
883                        cfg.total_core_instances(limit);
884                    }
885                    if let Some(limit) = self.opts.pooling_total_component_instances {
886                        cfg.total_component_instances(limit);
887                    }
888                    if let Some(limit) = self.opts.pooling_total_memories {
889                        cfg.total_memories(limit);
890                    }
891                    if let Some(limit) = self.opts.pooling_total_tables {
892                        cfg.total_tables(limit);
893                    }
894                    if let Some(limit) = self.opts.pooling_table_elements
895                        .or(self.wasm.max_table_elements)
896                    {
897                        cfg.table_elements(limit);
898                    }
899                    if let Some(limit) = self.opts.pooling_max_core_instance_size {
900                        cfg.max_core_instance_size(limit);
901                    }
902                    match_feature! {
903                        ["async" : self.opts.pooling_total_stacks]
904                        limit => cfg.total_stacks(limit),
905                        _ => err,
906                    }
907                    if let Some(max) = self.opts.pooling_max_memory_size
908                        .or(self.wasm.max_memory_size)
909                    {
910                        cfg.max_memory_size(max);
911                    }
912                    if let Some(size) = self.opts.pooling_decommit_batch_size {
913                        cfg.decommit_batch_size(size);
914                    }
915                    if let Some(max) = self.opts.pooling_max_unused_warm_slots {
916                        cfg.max_unused_warm_slots(max);
917                    }
918                    match_feature! {
919                        ["async" : self.opts.pooling_async_stack_keep_resident]
920                        size => cfg.async_stack_keep_resident(size),
921                        _ => err,
922                    }
923                    if let Some(max) = self.opts.pooling_max_component_instance_size {
924                        cfg.max_component_instance_size(max);
925                    }
926                    if let Some(max) = self.opts.pooling_max_core_instances_per_component {
927                        cfg.max_core_instances_per_component(max);
928                    }
929                    if let Some(max) = self.opts.pooling_max_memories_per_component {
930                        cfg.max_memories_per_component(max);
931                    }
932                    if let Some(max) = self.opts.pooling_max_tables_per_component {
933                        cfg.max_tables_per_component(max);
934                    }
935                    if let Some(max) = self.opts.pooling_max_tables_per_module {
936                        cfg.max_tables_per_module(max);
937                    }
938                    if let Some(max) = self.opts.pooling_max_memories_per_module {
939                        cfg.max_memories_per_module(max);
940                    }
941                    match_feature! {
942                        ["memory-protection-keys" : self.opts.pooling_memory_protection_keys]
943                        enable => cfg.memory_protection_keys(enable),
944                        _ => err,
945                    }
946                    match_feature! {
947                        ["memory-protection-keys" : self.opts.pooling_max_memory_protection_keys]
948                        max => cfg.max_memory_protection_keys(max),
949                        _ => err,
950                    }
951                    match_feature! {
952                        ["gc" : self.opts.pooling_total_gc_heaps]
953                        max => cfg.total_gc_heaps(max),
954                        _ => err,
955                    }
956                    if let Some(enabled) = self.opts.pooling_pagemap_scan {
957                        cfg.pagemap_scan(enabled);
958                    }
959                    config.allocation_strategy(wasmtime::InstanceAllocationStrategy::Pooling(cfg));
960                }
961            },
962            true => err,
963        }
964
965        if self.opts.pooling_memory_protection_keys.is_some()
966            && !self.opts.pooling_allocator.unwrap_or(false)
967        {
968            bail!("memory protection keys require the pooling allocator");
969        }
970
971        if self.opts.pooling_max_memory_protection_keys.is_some()
972            && !self.opts.pooling_memory_protection_keys.is_some()
973        {
974            bail!("max memory protection keys requires memory protection keys to be enabled");
975        }
976
977        match_feature! {
978            ["async" : self.wasm.async_stack_zeroing]
979            enable => config.async_stack_zeroing(enable),
980            _ => err,
981        }
982
983        if let Some(max) = self.wasm.max_wasm_stack {
984            config.max_wasm_stack(max);
985
986            // If `-Wasync-stack-size` isn't passed then automatically adjust it
987            // to the wasm stack size provided here too. That prevents the need
988            // to pass both when one can generally be inferred from the other.
989            #[cfg(any(feature = "async", feature = "stack-switching"))]
990            if self.wasm.async_stack_size.is_none() {
991                const DEFAULT_HOST_STACK: usize = 512 << 10;
992                config.async_stack_size(max + DEFAULT_HOST_STACK);
993            }
994        }
995
996        if let Some(enable) = self.wasm.relaxed_simd_deterministic {
997            config.relaxed_simd_deterministic(enable);
998        }
999        match_feature! {
1000            ["cranelift" : self.wasm.wmemcheck]
1001            enable => config.wmemcheck(enable),
1002            true => err,
1003        }
1004
1005        if let Some(enable) = self.wasm.gc_support {
1006            config.gc_support(enable);
1007        }
1008
1009        if let Some(enable) = self.wasm.shared_memory {
1010            config.shared_memory(enable);
1011        }
1012
1013        Ok(config)
1014    }
1015
1016    pub fn enable_wasm_features(&self, config: &mut Config) -> Result<()> {
1017        let all = self.wasm.all_proposals;
1018
1019        if let Some(enable) = self.wasm.simd.or(all) {
1020            config.wasm_simd(enable);
1021        }
1022        if let Some(enable) = self.wasm.relaxed_simd.or(all) {
1023            config.wasm_relaxed_simd(enable);
1024        }
1025        if let Some(enable) = self.wasm.bulk_memory.or(all) {
1026            config.wasm_bulk_memory(enable);
1027        }
1028        if let Some(enable) = self.wasm.multi_value.or(all) {
1029            config.wasm_multi_value(enable);
1030        }
1031        if let Some(enable) = self.wasm.tail_call.or(all) {
1032            config.wasm_tail_call(enable);
1033        }
1034        if let Some(enable) = self.wasm.multi_memory.or(all) {
1035            config.wasm_multi_memory(enable);
1036        }
1037        if let Some(enable) = self.wasm.memory64.or(all) {
1038            config.wasm_memory64(enable);
1039        }
1040        if let Some(enable) = self.wasm.stack_switching {
1041            config.wasm_stack_switching(enable);
1042        }
1043        if let Some(enable) = self.wasm.custom_page_sizes.or(all) {
1044            config.wasm_custom_page_sizes(enable);
1045        }
1046        if let Some(enable) = self.wasm.wide_arithmetic.or(all) {
1047            config.wasm_wide_arithmetic(enable);
1048        }
1049        if let Some(enable) = self.wasm.extended_const.or(all) {
1050            config.wasm_extended_const(enable);
1051        }
1052
1053        macro_rules! handle_conditionally_compiled {
1054            ($(($feature:tt, $field:tt, $method:tt))*) => ($(
1055                if let Some(enable) = self.wasm.$field.or(all) {
1056                    #[cfg(feature = $feature)]
1057                    config.$method(enable);
1058                    #[cfg(not(feature = $feature))]
1059                    if enable && all.is_none() {
1060                        bail!("support for {} was disabled at compile-time", $feature);
1061                    }
1062                }
1063            )*)
1064        }
1065
1066        handle_conditionally_compiled! {
1067            ("component-model", component_model, wasm_component_model)
1068            ("component-model-async", component_model_async, wasm_component_model_async)
1069            ("component-model-async", component_model_async_builtins, wasm_component_model_async_builtins)
1070            ("component-model-async", component_model_async_stackful, wasm_component_model_async_stackful)
1071            ("component-model-async", component_model_threading, wasm_component_model_threading)
1072            ("component-model", component_model_error_context, wasm_component_model_error_context)
1073            ("component-model", component_model_fixed_length_lists, wasm_component_model_fixed_length_lists)
1074            ("threads", threads, wasm_threads)
1075            ("gc", gc, wasm_gc)
1076            ("gc", reference_types, wasm_reference_types)
1077            ("gc", function_references, wasm_function_references)
1078            ("gc", exceptions, wasm_exceptions)
1079            ("stack-switching", stack_switching, wasm_stack_switching)
1080        }
1081
1082        if let Some(enable) = self.wasm.component_model_gc {
1083            #[cfg(all(feature = "component-model", feature = "gc"))]
1084            config.wasm_component_model_gc(enable);
1085            #[cfg(not(all(feature = "component-model", feature = "gc")))]
1086            if enable && all.is_none() {
1087                bail!("support for `component-model-gc` was disabled at compile time")
1088            }
1089        }
1090
1091        Ok(())
1092    }
1093
1094    pub fn from_file<P: AsRef<Path>>(path: P) -> Result<Self> {
1095        let path_ref = path.as_ref();
1096        let file_contents = fs::read_to_string(path_ref)
1097            .with_context(|| format!("failed to read config file: {path_ref:?}"))?;
1098        toml::from_str::<CommonOptions>(&file_contents)
1099            .with_context(|| format!("failed to parse TOML config file {path_ref:?}"))
1100    }
1101}
1102
1103#[cfg(test)]
1104mod tests {
1105    use wasmtime::{OptLevel, RegallocAlgorithm};
1106
1107    use super::*;
1108
1109    #[test]
1110    fn from_toml() {
1111        // empty toml
1112        let empty_toml = "";
1113        let mut common_options: CommonOptions = toml::from_str(empty_toml).unwrap();
1114        common_options.config(None).unwrap();
1115
1116        // basic toml
1117        let basic_toml = r#"
1118            [optimize]
1119            [codegen]
1120            [debug]
1121            [wasm]
1122            [wasi]
1123        "#;
1124        let mut common_options: CommonOptions = toml::from_str(basic_toml).unwrap();
1125        common_options.config(None).unwrap();
1126
1127        // toml with custom deserialization to match CLI flag parsing
1128        for (opt_value, expected) in [
1129            ("0", Some(OptLevel::None)),
1130            ("1", Some(OptLevel::Speed)),
1131            ("2", Some(OptLevel::Speed)),
1132            ("\"s\"", Some(OptLevel::SpeedAndSize)),
1133            ("\"hello\"", None), // should fail
1134            ("3", None),         // should fail
1135        ] {
1136            let toml = format!(
1137                r#"
1138                    [optimize]
1139                    opt-level = {opt_value}
1140                "#,
1141            );
1142            let parsed_opt_level = toml::from_str::<CommonOptions>(&toml)
1143                .ok()
1144                .and_then(|common_options| common_options.opts.opt_level);
1145
1146            assert_eq!(
1147                parsed_opt_level, expected,
1148                "Mismatch for input '{opt_value}'. Parsed: {parsed_opt_level:?}, Expected: {expected:?}"
1149            );
1150        }
1151
1152        // Regalloc algorithm
1153        for (regalloc_value, expected) in [
1154            ("\"backtracking\"", Some(RegallocAlgorithm::Backtracking)),
1155            ("\"single-pass\"", Some(RegallocAlgorithm::SinglePass)),
1156            ("\"hello\"", None), // should fail
1157            ("3", None),         // should fail
1158            ("true", None),      // should fail
1159        ] {
1160            let toml = format!(
1161                r#"
1162                    [optimize]
1163                    regalloc-algorithm = {regalloc_value}
1164                "#,
1165            );
1166            let parsed_regalloc_algorithm = toml::from_str::<CommonOptions>(&toml)
1167                .ok()
1168                .and_then(|common_options| common_options.opts.regalloc_algorithm);
1169            assert_eq!(
1170                parsed_regalloc_algorithm, expected,
1171                "Mismatch for input '{regalloc_value}'. Parsed: {parsed_regalloc_algorithm:?}, Expected: {expected:?}"
1172            );
1173        }
1174
1175        // Strategy
1176        for (strategy_value, expected) in [
1177            ("\"cranelift\"", Some(wasmtime::Strategy::Cranelift)),
1178            ("\"winch\"", Some(wasmtime::Strategy::Winch)),
1179            ("\"hello\"", None), // should fail
1180            ("5", None),         // should fail
1181            ("true", None),      // should fail
1182        ] {
1183            let toml = format!(
1184                r#"
1185                    [codegen]
1186                    compiler = {strategy_value}
1187                "#,
1188            );
1189            let parsed_strategy = toml::from_str::<CommonOptions>(&toml)
1190                .ok()
1191                .and_then(|common_options| common_options.codegen.compiler);
1192            assert_eq!(
1193                parsed_strategy, expected,
1194                "Mismatch for input '{strategy_value}'. Parsed: {parsed_strategy:?}, Expected: {expected:?}",
1195            );
1196        }
1197
1198        // Collector
1199        for (collector_value, expected) in [
1200            (
1201                "\"drc\"",
1202                Some(wasmtime::Collector::DeferredReferenceCounting),
1203            ),
1204            ("\"null\"", Some(wasmtime::Collector::Null)),
1205            ("\"hello\"", None), // should fail
1206            ("5", None),         // should fail
1207            ("true", None),      // should fail
1208        ] {
1209            let toml = format!(
1210                r#"
1211                    [codegen]
1212                    collector = {collector_value}
1213                "#,
1214            );
1215            let parsed_collector = toml::from_str::<CommonOptions>(&toml)
1216                .ok()
1217                .and_then(|common_options| common_options.codegen.collector);
1218            assert_eq!(
1219                parsed_collector, expected,
1220                "Mismatch for input '{collector_value}'. Parsed: {parsed_collector:?}, Expected: {expected:?}",
1221            );
1222        }
1223    }
1224}
1225
1226impl Default for CommonOptions {
1227    fn default() -> CommonOptions {
1228        CommonOptions::new()
1229    }
1230}
1231
1232impl fmt::Display for CommonOptions {
1233    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1234        let CommonOptions {
1235            codegen_raw,
1236            codegen,
1237            debug_raw,
1238            debug,
1239            opts_raw,
1240            opts,
1241            wasm_raw,
1242            wasm,
1243            wasi_raw,
1244            wasi,
1245            configured,
1246            target,
1247            config,
1248        } = self;
1249        if let Some(target) = target {
1250            write!(f, "--target {target} ")?;
1251        }
1252        if let Some(config) = config {
1253            write!(f, "--config {} ", config.display())?;
1254        }
1255
1256        let codegen_flags;
1257        let opts_flags;
1258        let wasi_flags;
1259        let wasm_flags;
1260        let debug_flags;
1261
1262        if *configured {
1263            codegen_flags = codegen.to_options();
1264            debug_flags = debug.to_options();
1265            wasi_flags = wasi.to_options();
1266            wasm_flags = wasm.to_options();
1267            opts_flags = opts.to_options();
1268        } else {
1269            codegen_flags = codegen_raw
1270                .iter()
1271                .flat_map(|t| t.0.iter())
1272                .cloned()
1273                .collect();
1274            debug_flags = debug_raw.iter().flat_map(|t| t.0.iter()).cloned().collect();
1275            wasi_flags = wasi_raw.iter().flat_map(|t| t.0.iter()).cloned().collect();
1276            wasm_flags = wasm_raw.iter().flat_map(|t| t.0.iter()).cloned().collect();
1277            opts_flags = opts_raw.iter().flat_map(|t| t.0.iter()).cloned().collect();
1278        }
1279
1280        for flag in codegen_flags {
1281            write!(f, "-C{flag} ")?;
1282        }
1283        for flag in opts_flags {
1284            write!(f, "-O{flag} ")?;
1285        }
1286        for flag in wasi_flags {
1287            write!(f, "-S{flag} ")?;
1288        }
1289        for flag in wasm_flags {
1290            write!(f, "-W{flag} ")?;
1291        }
1292        for flag in debug_flags {
1293            write!(f, "-D{flag} ")?;
1294        }
1295
1296        Ok(())
1297    }
1298}
wasmtime_cli_flags/lib.rs

wasmtime_cli_flags/
lib.rs
