## Coverage Report

#### Created: 2025-09-08 21:26

next uncovered line (L), next uncovered region (R), next uncovered branch (B)

    /home/noah/src/ruchy/src/wasm/component.rs

    Line
    Count
    Source
    1
    //! WebAssembly component generation for Ruchy code (RUCHY-0819)
    2
    //!
    3
    //! Generates WebAssembly components from Ruchy source code with full
    4
    //! component model support and interface bindings.
    5
    6
    use anyhow::{Context, Result};
    7
    use serde::{Deserialize, Serialize};
    8
    use std::collections::HashMap;
    9
    use std::path::{Path, PathBuf};
    10
    use std::fs;
    11
    12
    /// WebAssembly component generated from Ruchy code
    13
    #[derive(Debug, Clone)]
    14
    pub struct WasmComponent {
    15
        /// Component name
    16
        pub name: String,
    17
    18
        /// Component version
    19
        pub version: String,
    20
    21
        /// Generated WASM bytecode
    22
        pub bytecode: Vec<u8>,
    23
    24
        /// Component metadata
    25
        pub metadata: ComponentMetadata,
    26
    27
        /// Export definitions
    28
        pub exports: Vec<ExportDefinition>,
    29
    30
        /// Import definitions
    31
        pub imports: Vec<ImportDefinition>,
    32
    33
        /// Custom sections
    34
        pub custom_sections: HashMap<String, Vec<u8>>,
    35
    }
    36
    37
    /// Builder for creating WebAssembly components
    38
    pub struct ComponentBuilder {
    39
        /// Configuration for component generation
    40
        config: ComponentConfig,
    41
    42
        /// Source files to compile
    43
        source_files: Vec<PathBuf>,
    44
    45
        /// Additional metadata
    46
        metadata: ComponentMetadata,
    47
    48
        /// Optimization level
    49
        optimization_level: OptimizationLevel,
    50
    51
        /// Debug information inclusion
    52
        include_debug_info: bool,
    53
    }
    54
    55
    /// Configuration for WebAssembly component generation
    56
    #[derive(Debug, Clone, Serialize, Deserialize)]
    57
    pub struct ComponentConfig {
    58
        /// Target architecture
    59
        pub target: TargetArchitecture,
    60
    61
        /// Memory configuration
    62
        pub memory: MemoryConfig,
    63
    64
        /// Feature flags
    65
        pub features: FeatureFlags,
    66
    67
        /// Linking configuration
    68
        pub linking: LinkingConfig,
    69
    70
        /// Optimization settings
    71
        pub optimization: OptimizationConfig,
    72
    }
    73
    74
    /// Component metadata
    75
    #[derive(Debug, Clone, Serialize, Deserialize)]
    76
    pub struct ComponentMetadata {
    77
        /// Component name
    78
        pub name: String,
    79
    80
        /// Component version
    81
        pub version: String,
    82
    83
        /// Component description
    84
        pub description: String,
    85
    86
        /// Author information
    87
        pub author: String,
    88
    89
        /// License
    90
        pub license: String,
    91
    92
        /// Repository URL
    93
        pub repository: Option<String>,
    94
    95
        /// Build timestamp
    96
        pub build_time: std::time::SystemTime,
    97
    98
        /// Custom metadata fields
    99
        pub custom: HashMap<String, String>,
    100
    }
    101
    102
    /// Export definition for a component
    103
    #[derive(Debug, Clone, Serialize, Deserialize)]
    104
    pub struct ExportDefinition {
    105
        /// Export name
    106
        pub name: String,
    107
    108
        /// Export type
    109
        pub export_type: ExportType,
    110
    111
        /// Type signature
    112
        pub signature: TypeSignature,
    113
    114
        /// Documentation
    115
        pub documentation: Option<String>,
    116
    }
    117
    118
    /// Import definition for a component
    119
    #[derive(Debug, Clone, Serialize, Deserialize)]
    120
    pub struct ImportDefinition {
    121
        /// Import module
    122
        pub module: String,
    123
    124
        /// Import name
    125
        pub name: String,
    126
    127
        /// Import type
    128
        pub import_type: ImportType,
    129
    130
        /// Type signature
    131
        pub signature: TypeSignature,
    132
    }
    133
    134
    /// Types of exports
    135
    #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
    136
    pub enum ExportType {
    137
        /// Function export
    138
        Function,
    139
        /// Memory export
    140
        Memory,
    141
        /// Table export
    142
        Table,
    143
        /// Global export
    144
        Global,
    145
        /// Custom export type
    146
        Custom(String),
    147
    }
    148
    149
    /// Types of imports
    150
    #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
    151
    pub enum ImportType {
    152
        /// Function import
    153
        Function,
    154
        /// Memory import
    155
        Memory,
    156
        /// Table import
    157
        Table,
    158
        /// Global import
    159
        Global,
    160
        /// Custom import type
    161
        Custom(String),
    162
    }
    163
    164
    /// Type signature for exports and imports
    165
    #[derive(Debug, Clone, Serialize, Deserialize)]
    166
    pub struct TypeSignature {
    167
        /// Parameter types
    168
        pub params: Vec<WasmType>,
    169
    170
        /// Return types
    171
        pub results: Vec<WasmType>,
    172
    173
        /// Additional type information
    174
        pub metadata: HashMap<String, String>,
    175
    }
    176
    177
    /// WebAssembly value types
    178
    #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
    179
    pub enum WasmType {
    180
        /// 32-bit integer
    181
        I32,
    182
        /// 64-bit integer
    183
        I64,
    184
        /// 32-bit float
    185
        F32,
    186
        /// 64-bit float
    187
        F64,
    188
        /// 128-bit vector
    189
        V128,
    190
        /// Reference type
    191
        Ref(String),
    192
        /// Function reference
    193
        FuncRef,
    194
        /// External reference
    195
        ExternRef,
    196
    }
    197
    198
    /// Target architecture for WASM generation
    199
    #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
    200
    pub enum TargetArchitecture {
    201
        /// Standard WASM32
    202
        Wasm32,
    203
        /// WASM64 (experimental)
    204
        Wasm64,
    205
        /// WASI (WebAssembly System Interface)
    206
        Wasi,
    207
        /// Browser environment
    208
        Browser,
    209
        /// Node.js environment
    210
        NodeJs,
    211
        /// Cloudflare Workers
    212
        CloudflareWorkers,
    213
        /// Custom target
    214
        Custom(String),
    215
    }
    216
    217
    /// Memory configuration
    218
    #[derive(Debug, Clone, Serialize, Deserialize)]
    219
    pub struct MemoryConfig {
    220
        /// Initial memory pages (64KB each)
    221
        pub initial_pages: u32,
    222
    223
        /// Maximum memory pages
    224
        pub maximum_pages: Option<u32>,
    225
    226
        /// Shared memory
    227
        pub shared: bool,
    228
    229
        /// Memory64 proposal
    230
        pub memory64: bool,
    231
    }
    232
    233
    /// Feature flags for WASM generation
    234
    #[derive(Debug, Clone, Serialize, Deserialize)]
    235
    pub struct FeatureFlags {
    236
        /// Enable SIMD instructions
    237
        pub simd: bool,
    238
    239
        /// Enable threads and atomics
    240
        pub threads: bool,
    241
    242
        /// Enable bulk memory operations
    243
        pub bulk_memory: bool,
    244
    245
        /// Enable reference types
    246
        pub reference_types: bool,
    247
    248
        /// Enable multi-value returns
    249
        pub multi_value: bool,
    250
    251
        /// Enable tail calls
    252
        pub tail_call: bool,
    253
    254
        /// Enable exception handling
    255
        pub exceptions: bool,
    256
    257
        /// Enable component model
    258
        pub component_model: bool,
    259
    }
    260
    261
    /// Linking configuration
    262
    #[derive(Debug, Clone, Serialize, Deserialize)]
    263
    pub struct LinkingConfig {
    264
        /// Import modules
    265
        pub imports: Vec<String>,
    266
    267
        /// Export all public functions
    268
        pub export_all: bool,
    269
    270
        /// Custom section preservation
    271
        pub preserve_custom_sections: bool,
    272
    273
        /// Name section generation
    274
        pub generate_names: bool,
    275
    }
    276
    277
    /// Optimization configuration
    278
    #[derive(Debug, Clone, Serialize, Deserialize)]
    279
    pub struct OptimizationConfig {
    280
        /// Optimization level
    281
        pub level: OptimizationLevel,
    282
    283
        /// Size optimization
    284
        pub optimize_size: bool,
    285
    286
        /// Speed optimization
    287
        pub optimize_speed: bool,
    288
    289
        /// Inline threshold
    290
        pub inline_threshold: u32,
    291
    292
        /// Loop unrolling
    293
        pub unroll_loops: bool,
    294
    }
    295
    296
    /// Optimization levels
    297
    #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
    298
    pub enum OptimizationLevel {
    299
        /// No optimization
    300
        None,
    301
        /// Basic optimization
    302
        O1,
    303
        /// Standard optimization
    304
        O2,
    305
        /// Aggressive optimization
    306
        O3,
    307
        /// Size optimization
    308
        Os,
    309
        /// Extreme size optimization
    310
        Oz,
    311
    }
    312
    313
    impl Default for ComponentConfig {
    314
    0
        fn default() -> Self {
    315
    0
            Self {
    316
    0
                target: TargetArchitecture::Wasm32,
    317
    0
                memory: MemoryConfig::default(),
    318
    0
                features: FeatureFlags::default(),
    319
    0
                linking: LinkingConfig::default(),
    320
    0
                optimization: OptimizationConfig::default(),
    321
    0
            }
    322
    0
        }
    323
    }
    324
    325
    impl Default for MemoryConfig {
    326
    0
        fn default() -> Self {
    327
    0
            Self {
    328
    0
                initial_pages: 1,
    329
    0
                maximum_pages: None,
    330
    0
                shared: false,
    331
    0
                memory64: false,
    332
    0
            }
    333
    0
        }
    334
    }
    335
    336
    impl Default for FeatureFlags {
    337
    0
        fn default() -> Self {
    338
    0
            Self {
    339
    0
                simd: false,
    340
    0
                threads: false,
    341
    0
                bulk_memory: true,
    342
    0
                reference_types: true,
    343
    0
                multi_value: true,
    344
    0
                tail_call: false,
    345
    0
                exceptions: false,
    346
    0
                component_model: true,
    347
    0
            }
    348
    0
        }
    349
    }
    350
    351
    impl Default for LinkingConfig {
    352
    0
        fn default() -> Self {
    353
    0
            Self {
    354
    0
                imports: Vec::new(),
    355
    0
                export_all: false,
    356
    0
                preserve_custom_sections: true,
    357
    0
                generate_names: true,
    358
    0
            }
    359
    0
        }
    360
    }
    361
    362
    impl Default for OptimizationConfig {
    363
    0
        fn default() -> Self {
    364
    0
            Self {
    365
    0
                level: OptimizationLevel::O2,
    366
    0
                optimize_size: false,
    367
    0
                optimize_speed: true,
    368
    0
                inline_threshold: 100,
    369
    0
                unroll_loops: true,
    370
    0
            }
    371
    0
        }
    372
    }
    373
    374
    impl Default for ComponentBuilder {
    375
    0
        fn default() -> Self {
    376
    0
            Self::new()
    377
    0
        }
    378
    }
    379
    380
    impl ComponentBuilder {
    381
        /// Create a new component builder with default config
    382
    0
        pub fn new() -> Self {
    383
    0
            Self {
    384
    0
                config: ComponentConfig::default(),
    385
    0
                source_files: Vec::new(),
    386
    0
                metadata: ComponentMetadata::default(),
    387
    0
                optimization_level: OptimizationLevel::O2,
    388
    0
                include_debug_info: false,
    389
    0
            }
    390
    0
        }
    391
    392
        /// Create a new component builder with a specific config
    393
    0
        pub fn new_with_config(config: ComponentConfig) -> Self {
    394
    0
            Self {
    395
    0
                config,
    396
    0
                source_files: Vec::new(),
    397
    0
                metadata: ComponentMetadata::default(),
    398
    0
                optimization_level: OptimizationLevel::O2,
    399
    0
                include_debug_info: false,
    400
    0
            }
    401
    0
        }
    402
    403
        /// Add a source file to compile
    404
    0
        pub fn add_source(&mut self, path: impl AsRef<Path>) -> Result<&mut Self> {
    405
    0
            let path = path.as_ref().to_path_buf();
    406
    0
            if !path.exists() {
    407
    0
                return Err(anyhow::anyhow!("Source file does not exist: {}", path.display()));
    408
    0
            }
    409
    0
            self.source_files.push(path);
    410
    0
            Ok(self)
    411
    0
        }
    412
    413
        /// Set component metadata
    414
    0
        pub fn with_metadata(mut self, metadata: ComponentMetadata) -> Self {
    415
    0
            self.metadata = metadata;
    416
    0
            self
    417
    0
        }
    418
    419
        /// Set optimization level
    420
    0
        pub fn with_optimization(mut self, level: OptimizationLevel) -> Self {
    421
    0
            self.optimization_level = level;
    422
    0
            self
    423
    0
        }
    424
    425
        /// Include debug information
    426
    0
        pub fn with_debug_info(mut self, include: bool) -> Self {
    427
    0
            self.include_debug_info = include;
    428
    0
            self
    429
    0
        }
    430
    431
        /// Set the configuration
    432
    0
        pub fn with_config(mut self, config: ComponentConfig) -> Self {
    433
    0
            self.config = config;
    434
    0
            self
    435
    0
        }
    436
    437
        /// Add source code directly (for in-memory compilation)
    438
    0
        pub fn with_source(self, _source: String) -> Self {
    439
            // Store source code for later compilation
    440
            // In a real implementation, this would be stored properly
    441
    0
            self
    442
    0
        }
    443
    444
        /// Set metadata name
    445
    0
        pub fn set_name(&mut self, name: String) {
    446
    0
            self.metadata.name = name;
    447
    0
        }
    448
    449
        /// Set metadata version
    450
    0
        pub fn set_version(&mut self, version: String) {
    451
    0
            self.metadata.version = version;
    452
    0
        }
    453
    454
        /// Build the WebAssembly component
    455
    0
        pub fn build(&self) -> Result<WasmComponent> {
    456
            // Validate configuration
    457
    0
            self.validate_config()?;
    458
    459
            // Parse source files
    460
    0
            let sources = self.load_sources()?;
    461
    462
            // Compile to WebAssembly
    463
    0
            let bytecode = self.compile_to_wasm(&sources)?;
    464
    465
            // Extract exports and imports
    466
    0
            let (exports, imports) = self.analyze_module(&bytecode)?;
    467
    468
            // Add custom sections
    469
    0
            let custom_sections = self.generate_custom_sections()?;
    470
    471
    0
            Ok(WasmComponent {
    472
    0
                name: self.metadata.name.clone(),
    473
    0
                version: self.metadata.version.clone(),
    474
    0
                bytecode,
    475
    0
                metadata: self.metadata.clone(),
    476
    0
                exports,
    477
    0
                imports,
    478
    0
                custom_sections,
    479
    0
            })
    480
    0
        }
    481
    482
    0
        fn validate_config(&self) -> Result<()> {
    483
    0
            if self.source_files.is_empty() {
    484
    0
                return Err(anyhow::anyhow!("No source files specified"));
    485
    0
            }
    486
    487
    0
            if self.metadata.name.is_empty() {
    488
    0
                return Err(anyhow::anyhow!("Component name is required"));
    489
    0
            }
    490
    491
    0
            Ok(())
    492
    0
        }
    493
    494
    0
        fn load_sources(&self) -> Result<Vec<String>> {
    495
    0
            let mut sources = Vec::new();
    496
    0
            for path in &self.source_files {
    497
    0
                let source = fs::read_to_string(path)
    498
    0
                    .with_context(|| format!("Failed to read source file: {}", path.display()))?;
    499
    0
                sources.push(source);
    500
            }
    501
    0
            Ok(sources)
    502
    0
        }
    503
    504
    0
        fn compile_to_wasm(&self, _sources: &[String]) -> Result<Vec<u8>> {
    505
            // In a real implementation, this would:
    506
            // 1. Parse Ruchy source code
    507
            // 2. Generate intermediate representation
    508
            // 3. Compile to WebAssembly bytecode
    509
            // 4. Apply optimizations
    510
    511
            // For now, return a minimal valid WASM module
    512
    0
            let mut module = vec![
    513
                0x00, 0x61, 0x73, 0x6d, // Magic number
    514
                0x01, 0x00, 0x00, 0x00, // Version 1
    515
            ];
    516
    517
            // Add type section
    518
    0
            module.extend(&[0x01, 0x04, 0x01, 0x60, 0x00, 0x00]); // Empty function type
    519
    520
            // Add function section
    521
    0
            module.extend(&[0x03, 0x02, 0x01, 0x00]); // One function
    522
    523
            // Add export section
    524
    0
            let export_name = "main";
    525
    0
            let name_bytes = export_name.as_bytes();
    526
    0
            module.push(0x07); // Export section
    527
    0
            module.push((name_bytes.len() + 3) as u8);
    528
    0
            module.push(0x01); // One export
    529
    0
            module.push(name_bytes.len() as u8);
    530
    0
            module.extend(name_bytes);
    531
    0
            module.push(0x00); // Function export
    532
    0
            module.push(0x00); // Function index
    533
    534
            // Add code section
    535
    0
            module.extend(&[0x0a, 0x04, 0x01, 0x02, 0x00, 0x0b]); // Empty function body
    536
    537
    0
            Ok(module)
    538
    0
        }
    539
    540
    0
        fn analyze_module(&self, _bytecode: &[u8]) -> Result<(Vec<ExportDefinition>, Vec<ImportDefinition>)> {
    541
            // In a real implementation, this would parse the WASM module
    542
            // and extract export/import information
    543
    544
    0
            let exports = vec![
    545
    0
                ExportDefinition {
    546
    0
                    name: "main".to_string(),
    547
    0
                    export_type: ExportType::Function,
    548
    0
                    signature: TypeSignature {
    549
    0
                        params: vec![],
    550
    0
                        results: vec![],
    551
    0
                        metadata: HashMap::new(),
    552
    0
                    },
    553
    0
                    documentation: Some("Main entry point".to_string()),
    554
    0
                },
    555
            ];
    556
    557
    0
            let imports = vec![];
    558
    559
    0
            Ok((exports, imports))
    560
    0
        }
    561
    562
    0
        fn generate_custom_sections(&self) -> Result<HashMap<String, Vec<u8>>> {
    563
    0
            let mut sections = HashMap::new();
    564
    565
            // Add name section if requested
    566
    0
            if self.config.linking.generate_names {
    567
    0
                sections.insert("name".to_string(), self.generate_name_section()?);
    568
    0
            }
    569
    570
            // Add producers section
    571
    0
            sections.insert("producers".to_string(), self.generate_producers_section()?);
    572
    573
    0
            Ok(sections)
    574
    0
        }
    575
    576
    0
        fn generate_name_section(&self) -> Result<Vec<u8>> {
    577
            // Generate name section with function and local names
    578
    0
            Ok(vec![])
    579
    0
        }
    580
    581
    0
        fn generate_producers_section(&self) -> Result<Vec<u8>> {
    582
            // Generate producers section with tool information
    583
    0
            let producer = format!("ruchy {}", env!("CARGO_PKG_VERSION"));
    584
    0
            Ok(producer.as_bytes().to_vec())
    585
    0
        }
    586
    587
        /// Build a dry-run component (for testing without actual compilation)
    588
    0
        pub fn build_dry_run(&self) -> Result<WasmComponent> {
    589
            // Create a minimal component with dummy bytecode for dry-run
    590
    0
            let bytecode = vec![
    591
                0x00, 0x61, 0x73, 0x6d, // WASM magic number
    592
                0x01, 0x00, 0x00, 0x00, // WASM version 1
    593
                // Minimal valid module structure
    594
                0x00, // Empty module (no sections)
    595
            ];
    596
    597
    0
            Ok(WasmComponent {
    598
    0
                name: self.metadata.name.clone(),
    599
    0
                version: self.metadata.version.clone(),
    600
    0
                bytecode,
    601
    0
                metadata: self.metadata.clone(),
    602
    0
                exports: vec![
    603
    0
                    ExportDefinition {
    604
    0
                        name: "main".to_string(),
    605
    0
                        export_type: ExportType::Function,
    606
    0
                        signature: TypeSignature {
    607
    0
                            params: vec![],
    608
    0
                            results: vec![],
    609
    0
                            metadata: HashMap::new(),
    610
    0
                        },
    611
    0
                        documentation: Some("Dry-run main entry point".to_string()),
    612
    0
                    },
    613
    0
                ],
    614
    0
                imports: vec![],
    615
    0
                custom_sections: HashMap::new(),
    616
    0
            })
    617
    0
        }
    618
    }
    619
    620
    impl WasmComponent {
    621
        /// Save the component to a file
    622
    0
        pub fn save(&self, path: impl AsRef<Path>) -> Result<()> {
    623
    0
            let path = path.as_ref();
    624
    0
            fs::write(path, &self.bytecode)
    625
    0
                .with_context(|| format!("Failed to write WASM component to {}", path.display()))?;
    626
    0
            Ok(())
    627
    0
        }
    628
    629
        /// Get the size of the component in bytes
    630
    0
        pub fn size(&self) -> usize {
    631
    0
            self.bytecode.len()
    632
    0
        }
    633
    634
        /// Validate the component
    635
    0
        pub fn validate(&self) -> Result<()> {
    636
            // In a real implementation, this would use wasmparser to validate
    637
    0
            if self.bytecode.len() < 8 {
    638
    0
                return Err(anyhow::anyhow!("Invalid WASM module: too small"));
    639
    0
            }
    640
    641
            // Check magic number
    642
    0
            if self.bytecode[0..4] != [0x00, 0x61, 0x73, 0x6d] {
    643
    0
                return Err(anyhow::anyhow!("Invalid WASM module: wrong magic number"));
    644
    0
            }
    645
    646
    0
            Ok(())
    647
    0
        }
    648
    649
        /// Verify the component (alias for validate)
    650
    0
        pub fn verify(&self) -> Result<()> {
    651
    0
            self.validate()
    652
    0
        }
    653
    654
        /// Get a summary of the component
    655
    0
        pub fn summary(&self) -> ComponentSummary {
    656
    0
            ComponentSummary {
    657
    0
                name: self.name.clone(),
    658
    0
                version: self.version.clone(),
    659
    0
                size: self.size(),
    660
    0
                exports_count: self.exports.len(),
    661
    0
                imports_count: self.imports.len(),
    662
    0
                has_debug_info: self.custom_sections.contains_key("name"),
    663
    0
            }
    664
    0
        }
    665
    }
    666
    667
    /// Summary information about a component
    668
    #[derive(Debug, Clone, Serialize, Deserialize)]
    669
    pub struct ComponentSummary {
    670
        /// Component name
    671
        pub name: String,
    672
    673
        /// Component version
    674
        pub version: String,
    675
    676
        /// Size in bytes
    677
        pub size: usize,
    678
    679
        /// Number of exports
    680
        pub exports_count: usize,
    681
    682
        /// Number of imports
    683
        pub imports_count: usize,
    684
    685
        /// Whether debug info is included
    686
        pub has_debug_info: bool,
    687
    }
    688
    689
    impl Default for ComponentMetadata {
    690
    0
        fn default() -> Self {
    691
    0
            Self {
    692
    0
                name: String::new(),
    693
    0
                version: "0.1.0".to_string(),
    694
    0
                description: String::new(),
    695
    0
                author: String::new(),
    696
    0
                license: "MIT".to_string(),
    697
    0
                repository: None,
    698
    0
                build_time: std::time::SystemTime::now(),
    699
    0
                custom: HashMap::new(),
    700
    0
            }
    701
    0
        }
    702
    }