1 //! Contains the common Wasmtime command line interface (CLI) flags. 2 3 use clap::Parser; 4 use serde::Deserialize; 5 use std::{ 6 fmt, fs, 7 path::{Path, PathBuf}, 8 time::Duration, 9 }; 10 use wasmtime::{Config, Result, bail, error::Context as _}; 11 12 pub mod opt; 13 14 #[cfg(feature = "logging")] 15 fn 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 43 wasmtime_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 } 207 208 wasmtime_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 } 259 260 wasmtime_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 } 282 283 wasmtime_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 } 421 422 wasmtime_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)] 505 pub struct WasiNnGraph { 506 pub format: String, 507 pub dir: String, 508 } 509 510 #[derive(Debug, Clone, PartialEq)] 511 pub 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)] 519 pub 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 } 595 596 macro_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 } 616 617 impl 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)] 1104 mod 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 1226 impl Default for CommonOptions { 1227 fn default() -> CommonOptions { 1228 CommonOptions::new() 1229 } 1230 } 1231 1232 impl 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 } 1299