mirror of
https://github.com/fluencelabs/wasmer
synced 2024-12-13 22:25:40 +00:00
841 lines
37 KiB
Rust
841 lines
37 KiB
Rust
#![allow(warnings, dead_code)]
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#[cfg(test)]
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mod tests {
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struct SpecFailure {
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file: String,
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line: u64,
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kind: String,
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message: String,
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}
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struct TestReport {
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failures: Vec<SpecFailure>,
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passed: u32,
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failed: u32,
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}
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impl TestReport {
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pub fn countPassed(&mut self) {
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self.passed += 1;
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}
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pub fn hasFailures(&self) -> bool {
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self.failed > 0
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}
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pub fn addFailure(&mut self, failure: SpecFailure) {
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self.failed += 1;
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self.failures.push(failure);
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}
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}
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const TESTS: &[&str] = &[
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"spectests/address.wast",
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"spectests/align.wast",
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"spectests/binary.wast",
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"spectests/block.wast",
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"spectests/br.wast",
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"spectests/br_if.wast",
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"spectests/br_table.wast",
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"spectests/break_drop.wast",
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"spectests/call.wast",
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"spectests/call_indirect.wast",
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"spectests/comments.wast",
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"spectests/const_.wast",
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"spectests/conversions.wast",
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"spectests/custom.wast",
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"spectests/data.wast",
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"spectests/elem.wast",
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"spectests/endianness.wast",
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"spectests/exports.wast",
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"spectests/f32_.wast",
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"spectests/f32_bitwise.wast",
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"spectests/f32_cmp.wast",
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"spectests/f64_.wast",
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"spectests/f64_bitwise.wast",
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"spectests/f64_cmp.wast",
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"spectests/fac.wast",
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"spectests/float_exprs.wast",
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"spectests/float_literals.wast",
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"spectests/float_memory.wast",
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"spectests/float_misc.wast",
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"spectests/forward.wast",
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"spectests/func.wast",
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"spectests/func_ptrs.wast",
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"spectests/get_local.wast",
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"spectests/globals.wast",
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"spectests/i32_.wast",
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"spectests/i64_.wast",
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"spectests/if_.wast",
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"spectests/int_exprs.wast",
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"spectests/int_literals.wast",
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"spectests/labels.wast",
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"spectests/left_to_right.wast",
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"spectests/loop_.wast",
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"spectests/memory.wast",
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"spectests/memory_grow.wast",
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"spectests/memory_redundancy.wast",
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"spectests/memory_trap.wast",
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"spectests/nop.wast",
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"spectests/return_.wast",
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"spectests/select.wast",
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"spectests/set_local.wast",
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"spectests/stack.wast",
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"spectests/start.wast",
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"spectests/store_retval.wast",
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"spectests/switch.wast",
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"spectests/tee_local.wast",
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"spectests/token.wast",
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"spectests/traps.wast",
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"spectests/typecheck.wast",
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"spectests/types.wast",
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"spectests/unwind.wast",
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#[cfg(feature = "llvm")]
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"spectests/simd.wast",
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#[cfg(feature = "llvm")]
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"spectests/simd_binaryen.wast",
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];
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use wasmer_runtime_core::backend::Compiler;
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#[cfg(feature = "clif")]
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fn get_compiler() -> impl Compiler {
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use wasmer_clif_backend::CraneliftCompiler;
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CraneliftCompiler::new()
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}
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#[cfg(feature = "llvm")]
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fn get_compiler() -> impl Compiler {
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use wasmer_llvm_backend::LLVMCompiler;
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LLVMCompiler::new()
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}
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#[cfg(feature = "singlepass")]
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fn get_compiler() -> impl Compiler {
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use wasmer_singlepass_backend::SinglePassCompiler;
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SinglePassCompiler::new()
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}
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#[cfg(not(any(feature = "llvm", feature = "clif", feature = "singlepass")))]
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fn get_compiler() -> impl Compiler {
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panic!("compiler not specified, activate a compiler via features");
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use wasmer_clif_backend::CraneliftCompiler;
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CraneliftCompiler::new()
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}
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#[cfg(feature = "clif")]
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fn get_compiler_name() -> &'static str {
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"clif"
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}
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#[cfg(feature = "llvm")]
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fn get_compiler_name() -> &'static str {
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"llvm"
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}
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#[cfg(feature = "singlepass")]
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fn get_compiler_name() -> &'static str {
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"singlepass"
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}
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#[cfg(not(any(feature = "llvm", feature = "clif", feature = "singlepass")))]
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fn get_compiler_name() -> &'static str {
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panic!("compiler not specified, activate a compiler via features");
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"unknown"
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}
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use std::collections::HashMap;
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use std::path::PathBuf;
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use std::{env, fs, io::Write};
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use wabt::script::{Action, Command, CommandKind, ScriptParser, Value};
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use wasmer_runtime_core::error::CompileError;
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use wasmer_runtime_core::import::ImportObject;
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use wasmer_runtime_core::Instance;
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use wasmer_runtime_core::{func, imports, vm::Ctx};
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use wasmer_runtime_core::{
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global::Global,
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memory::Memory,
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prelude::*,
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table::Table,
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types::{ElementType, MemoryDescriptor, TableDescriptor},
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units::Pages,
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};
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fn parse_and_run(
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path: &PathBuf,
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excludes: &HashMap<String, Exclude>,
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) -> Result<TestReport, String> {
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let mut test_report = TestReport {
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failures: vec![],
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passed: 0,
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failed: 0,
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};
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// TODO Add more assertions
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// TODO Allow running WAST &str directly (E.g. for use outside of spectests
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// TODO Check all tests are up to date
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// TODO Files could be run with multiple threads
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// TODO implment allowed failures in excludes
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let source = fs::read(&path).unwrap();
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let filename = path.file_name().unwrap().to_str().unwrap();
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let source = fs::read(&path).unwrap();
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let mut features = wabt::Features::new();
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features.enable_simd();
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let mut parser: ScriptParser =
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ScriptParser::from_source_and_name_with_features(&source, filename, features)
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.expect(&format!("Failed to parse script {}", &filename));
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use std::panic;
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let mut instance: Option<Instance> = None;
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while let Some(Command { kind, line }) =
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parser.next().map_err(|e| format!("Parse err: {:?}", e))?
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{
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let backend = get_compiler_name();
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let test_key = format!("{}:{}:{}", backend, filename, line);
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// Use this line to debug which test is running
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println!("Running test: {}", test_key);
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if excludes.contains_key(&test_key) && *excludes.get(&test_key).unwrap() == Exclude::Skip
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{
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println!("Skipping test: {}", test_key);
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continue;
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}
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match kind {
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CommandKind::Module { module, name } => {
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// println!("Module");
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let result = panic::catch_unwind(|| {
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let spectest_import_object = get_spectest_import_object();
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let module =
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wasmer_runtime_core::compile_with(&module.into_vec(), &get_compiler())
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.expect("WASM can't be compiled");
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let i = module
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.instantiate(&spectest_import_object)
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.expect("WASM can't be instantiated");
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i
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});
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match result {
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Err(e) => {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line: line,
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kind: format!("{:?}", "Module"),
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message: format!("caught panic {:?}", e),
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});
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instance = None;
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}
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Ok(i) => {
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instance = Some(i);
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}
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}
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}
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CommandKind::AssertReturn { action, expected } => {
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match action {
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Action::Invoke {
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module,
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field,
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args,
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} => {
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if (&instance).is_none() {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line: line,
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kind: format!("{:?}", "AssertReturn"),
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message: format!("No instance available"),
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});
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} else {
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let params: Vec<wasmer_runtime_core::types::Value> =
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args.iter().cloned().map(|x| convert_value(x)).collect();
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let call_result =
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instance.as_ref().unwrap().call(&field, ¶ms[..]);
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match call_result {
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Err(e) => {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line,
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kind: format!("{:?}", "AssertReturn"),
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message: format!("Call failed {:?}", e),
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});
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}
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Ok(values) => {
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for (i, v) in values.iter().enumerate() {
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let expected_value =
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convert_value(*expected.get(i).unwrap());
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if (*v != expected_value) {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line,
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kind: format!("{:?}", "AssertReturn"),
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message: format!(
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"result {:?} ({:?}) does not match expected {:?} ({:?})",
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v, to_hex(v.clone()), expected_value, to_hex(expected_value.clone())
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),
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});
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} else {
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test_report.countPassed();
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}
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}
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}
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}
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}
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}
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_ => println!("unexpected action in assert return"),
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}
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// println!("in assert return");
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}
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CommandKind::AssertReturnCanonicalNan { action } => match action {
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Action::Invoke {
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module,
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field,
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args,
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} => {
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if (&instance).is_none() {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line: line,
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kind: format!("{:?}", "AssertReturnCanonicalNan"),
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message: format!("No instance available"),
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});
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} else {
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let params: Vec<wasmer_runtime_core::types::Value> =
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args.iter().cloned().map(|x| convert_value(x)).collect();
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let call_result = instance.as_ref().unwrap().call(&field, ¶ms[..]);
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match call_result {
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Err(e) => {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line,
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kind: format!("{:?}", "AssertReturnCanonicalNan"),
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message: format!("Call failed {:?}", e),
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});
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}
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Ok(values) => {
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for (i, v) in values.iter().enumerate() {
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if is_canonical_nan(v.clone()) {
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test_report.countPassed();
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} else {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line,
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kind: format!("{:?}", "AssertReturnCanonicalNan"),
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message: format!(
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"value is not canonical nan {:?}",
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v
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),
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});
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}
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}
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}
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}
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}
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}
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_ => panic!("unexpected action in assert return canonical nan"),
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},
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CommandKind::AssertReturnArithmeticNan { action } => match action {
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Action::Invoke {
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module,
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field,
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args,
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} => {
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if (&instance).is_none() {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line: line,
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kind: format!("{:?}", "AssertReturnArithmeticNan"),
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message: format!("No instance available"),
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});
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} else {
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let params: Vec<wasmer_runtime_core::types::Value> =
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args.iter().cloned().map(|x| convert_value(x)).collect();
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let call_result = instance.as_ref().unwrap().call(&field, ¶ms[..]);
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match call_result {
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Err(e) => {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line,
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kind: format!("{:?}", "AssertReturnArithmeticNan"),
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message: format!("Call failed {:?}", e),
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});
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}
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Ok(values) => {
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for (i, v) in values.iter().enumerate() {
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if is_arithmetic_nan(v.clone()) {
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test_report.countPassed();
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} else {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line,
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kind: format!("{:?}", "AssertReturnArithmeticNan"),
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message: format!(
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"value is not arithmetic nan {:?}",
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v
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),
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});
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}
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}
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}
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}
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}
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}
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_ => panic!("unexpected action in assert return arithmetic nan"),
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},
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CommandKind::AssertTrap { action, message } => match action {
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Action::Invoke {
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module,
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field,
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args,
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} => {
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if (&instance).is_none() {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line: line,
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kind: format!("{:?}", "AssertTrap"),
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message: format!("No instance available"),
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});
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} else {
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let params: Vec<wasmer_runtime_core::types::Value> =
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args.iter().cloned().map(|x| convert_value(x)).collect();
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let call_result = instance.as_ref().unwrap().call(&field, ¶ms[..]);
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use wasmer_runtime_core::error::{CallError, RuntimeError};
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match call_result {
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Err(e) => {
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match e {
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CallError::Resolve(_) => {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line,
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kind: format!("{:?}", "AssertTrap"),
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message: format!("expected trap, got {:?}", e),
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});
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}
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CallError::Runtime(r) => {
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match r {
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RuntimeError::Trap { .. } => {
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// TODO assert message?
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test_report.countPassed()
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}
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RuntimeError::Error { .. } => {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line,
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kind: format!("{:?}", "AssertTrap"),
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message: format!(
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"expected trap, got Runtime:Error {:?}",
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r
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),
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});
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}
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}
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}
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}
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}
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Ok(values) => {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line,
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kind: format!("{:?}", "AssertTrap"),
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message: format!("expected trap, got {:?}", values),
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});
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}
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}
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}
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}
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_ => println!("unexpected action"),
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},
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CommandKind::AssertInvalid { module, message } => {
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// println!("AssertInvalid");
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let result = panic::catch_unwind(|| {
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wasmer_runtime_core::compile_with(&module.into_vec(), &get_compiler())
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});
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match result {
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Ok(module) => {
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if let Err(CompileError::InternalError { msg }) = module {
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test_report.countPassed();
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// println!("expected: {:?}", message);
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// println!("actual: {:?}", msg);
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} else if let Err(CompileError::ValidationError { msg }) = module {
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test_report.countPassed();
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// println!("validation expected: {:?}", message);
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// println!("validation actual: {:?}", msg);
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} else {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line: line,
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kind: format!("{:?}", "AssertInvalid"),
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message: "Should be invalid".to_string(),
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});
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}
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}
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Err(p) => {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line: line,
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kind: format!("{:?}", "AssertInvalid"),
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message: format!("caught panic {:?}", p),
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});
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}
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}
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}
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CommandKind::AssertMalformed { module, message } => {
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// println!("AssertMalformed");
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let result = panic::catch_unwind(|| {
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wasmer_runtime_core::compile_with(&module.into_vec(), &get_compiler())
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});
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match result {
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Ok(module) => {
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if let Err(CompileError::InternalError { msg }) = module {
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test_report.countPassed();
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// println!("expected: {:?}", message);
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// println!("actual: {:?}", msg);
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} else if let Err(CompileError::ValidationError { msg }) = module {
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test_report.countPassed();
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// println!("validation expected: {:?}", message);
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// println!("validation actual: {:?}", msg);
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} else {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line: line,
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kind: format!("{:?}", "AssertMalformed"),
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message: format!("should be malformed"),
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});
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}
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}
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Err(p) => {
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test_report.addFailure(SpecFailure {
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file: filename.to_string(),
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line: line,
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kind: format!("{:?}", "AssertMalformed"),
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message: format!("caught panic {:?}", p),
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});
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}
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}
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}
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CommandKind::AssertUninstantiable { module, message } => {
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println!("AssertUninstantiable not yet implmented")
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}
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CommandKind::AssertExhaustion { action, message } => {
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println!("AssertExhaustion not yet implemented")
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}
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CommandKind::AssertUnlinkable { module, message } => {
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println!("AssertUnlinkable {:? }{:?}", filename, line);
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let result = panic::catch_unwind(|| {
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let module =
|
|
wasmer_runtime_core::compile_with(&module.into_vec(), &get_compiler())
|
|
.expect("WASM can't be compiled");
|
|
module.instantiate(&ImportObject::new())
|
|
});
|
|
match result {
|
|
Err(e) => {
|
|
test_report.addFailure(SpecFailure {
|
|
file: filename.to_string(),
|
|
line: line,
|
|
kind: format!("{:?}", "AssertUnlinkable"),
|
|
message: format!("caught panic {:?}", e),
|
|
});
|
|
}
|
|
Ok(result) => match result {
|
|
Ok(_) => {
|
|
test_report.addFailure(SpecFailure {
|
|
file: filename.to_string(),
|
|
line: line,
|
|
kind: format!("{:?}", "AssertUnlinkable"),
|
|
message: format!("instantiate successful, expected unlinkable"),
|
|
});
|
|
}
|
|
Err(e) => match e {
|
|
wasmer_runtime_core::error::Error::LinkError(_) => {
|
|
test_report.countPassed();
|
|
}
|
|
_ => {
|
|
test_report.addFailure(SpecFailure {
|
|
file: filename.to_string(),
|
|
line: line,
|
|
kind: format!("{:?}", "AssertUnlinkable"),
|
|
message: format!("expected link error, got {:?}", e),
|
|
});
|
|
}
|
|
},
|
|
},
|
|
}
|
|
println!("AssertUnlinkable Done");
|
|
}
|
|
CommandKind::Register { name, as_name } => {
|
|
println!("Register not implemented {:?} {:?}", filename, line)
|
|
}
|
|
CommandKind::PerformAction(ref action) => match action {
|
|
Action::Invoke {
|
|
module,
|
|
field,
|
|
args,
|
|
} => {
|
|
println!("PerformAction: {:?} {:?}", filename, line);
|
|
if module.is_some() {
|
|
panic!("unexpected module in invoke");
|
|
} else {
|
|
if (&instance).is_none() {
|
|
test_report.addFailure(SpecFailure {
|
|
file: filename.to_string(),
|
|
line: line,
|
|
kind: format!("{:?}", "PerformAction"),
|
|
message: format!("No instance available"),
|
|
});
|
|
} else {
|
|
let params: Vec<wasmer_runtime_core::types::Value> =
|
|
args.iter().cloned().map(|x| convert_value(x)).collect();
|
|
let call_result =
|
|
instance.as_ref().unwrap().call(&field, ¶ms[..]);
|
|
match call_result {
|
|
Err(e) => {
|
|
test_report.addFailure(SpecFailure {
|
|
file: filename.to_string(),
|
|
line,
|
|
kind: format!("{:?}", "PerformAction"),
|
|
message: format!("Call failed {:?}", e),
|
|
});
|
|
}
|
|
Ok(values) => {
|
|
test_report.countPassed();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
Action::Get { module, field } => {
|
|
println!("Action Get not implemented {:?} {:?}", filename, line)
|
|
}
|
|
},
|
|
_ => panic!("unknown wast command"),
|
|
}
|
|
}
|
|
Ok(test_report)
|
|
}
|
|
|
|
fn is_canonical_nan(val: wasmer_runtime_core::types::Value) -> bool {
|
|
match val {
|
|
wasmer_runtime_core::types::Value::F32(x) => x.is_canonical_nan(),
|
|
wasmer_runtime_core::types::Value::F64(x) => x.is_canonical_nan(),
|
|
_ => panic!("value is not a float {:?}", val),
|
|
}
|
|
}
|
|
|
|
fn is_arithmetic_nan(val: wasmer_runtime_core::types::Value) -> bool {
|
|
match val {
|
|
wasmer_runtime_core::types::Value::F32(x) => x.is_quiet_nan(),
|
|
wasmer_runtime_core::types::Value::F64(x) => x.is_quiet_nan(),
|
|
_ => panic!("value is not a float {:?}", val),
|
|
}
|
|
}
|
|
|
|
fn convert_value(other: Value<f32, f64>) -> wasmer_runtime_core::types::Value {
|
|
match other {
|
|
Value::I32(v) => wasmer_runtime_core::types::Value::I32(v),
|
|
Value::I64(v) => wasmer_runtime_core::types::Value::I64(v),
|
|
Value::F32(v) => wasmer_runtime_core::types::Value::F32(v),
|
|
Value::F64(v) => wasmer_runtime_core::types::Value::F64(v),
|
|
Value::V128(v) => wasmer_runtime_core::types::Value::V128(v),
|
|
}
|
|
}
|
|
|
|
fn to_hex(v: wasmer_runtime_core::types::Value) -> String {
|
|
match v {
|
|
wasmer_runtime_core::types::Value::I32(v) => format!("{:#x}", v),
|
|
wasmer_runtime_core::types::Value::I64(v) => format!("{:#x}", v),
|
|
wasmer_runtime_core::types::Value::F32(v) => format!("{:#x}", v.to_bits()),
|
|
wasmer_runtime_core::types::Value::F64(v) => format!("{:#x}", v.to_bits()),
|
|
wasmer_runtime_core::types::Value::V128(v) => format!("{:#x}", v),
|
|
}
|
|
}
|
|
|
|
fn print_i32(ctx: &mut Ctx, val: i32) {
|
|
println!("{}", val);
|
|
}
|
|
|
|
fn get_spectest_import_object() -> ImportObject {
|
|
let memory = Memory::new(MemoryDescriptor {
|
|
minimum: Pages(1),
|
|
maximum: Some(Pages(1)),
|
|
shared: false,
|
|
})
|
|
.unwrap();
|
|
|
|
let global_i32 = Global::new(wasmer_runtime_core::types::Value::I32(666));
|
|
let global_f32 = Global::new(wasmer_runtime_core::types::Value::F32(666.0));
|
|
let global_f64 = Global::new(wasmer_runtime_core::types::Value::F64(666.0));
|
|
|
|
let table = Table::new(TableDescriptor {
|
|
element: ElementType::Anyfunc,
|
|
minimum: 10,
|
|
maximum: Some(20),
|
|
})
|
|
.unwrap();
|
|
imports! {
|
|
"spectest" => {
|
|
"print_i32" => func!(print_i32),
|
|
"table" => table,
|
|
"global_i32" => global_i32,
|
|
"global_f32" => global_f32,
|
|
"global_f64" => global_f64,
|
|
|
|
},
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
|
|
enum Exclude {
|
|
Skip,
|
|
Fail,
|
|
}
|
|
|
|
use std::fs::File;
|
|
use std::io::{BufRead, BufReader, Error};
|
|
|
|
/// Reads the excludes.txt file into a hash map
|
|
fn read_excludes() -> HashMap<String, Exclude> {
|
|
let mut excludes_path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
|
|
excludes_path.push("tests");
|
|
excludes_path.push("excludes.txt");
|
|
let input = File::open(excludes_path).unwrap();
|
|
let buffered = BufReader::new(input);
|
|
let mut result = HashMap::new();
|
|
for line in buffered.lines() {
|
|
let mut line = line.unwrap();
|
|
if line.trim().is_empty() || line.starts_with("#") {
|
|
// ignore line
|
|
} else {
|
|
if line.contains("#"){ // Allow end of line comment
|
|
let l: Vec<&str> = line.split('#').collect();
|
|
line = l.get(0).unwrap().to_string();
|
|
}
|
|
//println!("exclude line {}", line);
|
|
// <backend>:<exclude-kind>:<test-file-name>:<test-file-line>
|
|
let split: Vec<&str> = line.trim().split(':').collect();
|
|
assert_eq!(split.len(), 4);
|
|
let kind = match *split.get(1).unwrap() {
|
|
"skip" => Exclude::Skip,
|
|
"fail" => Exclude::Fail,
|
|
_ => panic!("unknown exclude kind"),
|
|
};
|
|
let backend = split.get(0).unwrap();
|
|
let testfile = split.get(2).unwrap();
|
|
let line = split.get(3).unwrap();
|
|
let key = format!("{}:{}:{}", backend, testfile, line);
|
|
result.insert(key, kind);
|
|
}
|
|
}
|
|
result
|
|
}
|
|
|
|
#[test]
|
|
fn test_run_spectests() {
|
|
let mut success = true;
|
|
let mut test_reports = vec![];
|
|
|
|
let excludes = read_excludes();
|
|
|
|
for test in TESTS.iter() {
|
|
let test_name = test.split("/").last().unwrap().split(".").next().unwrap();
|
|
// println!("Running: {:?} =============================>", test_name);
|
|
let mut wast_path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
|
|
wast_path.push(test);
|
|
let result = parse_and_run(&wast_path, &excludes);
|
|
match result {
|
|
Ok(test_report) => {
|
|
if test_report.hasFailures() {
|
|
success = false
|
|
}
|
|
test_reports.push(test_report);
|
|
}
|
|
Err(e) => {
|
|
success = false;
|
|
println!("Unexpected test run error: {:?}", e)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Print summary
|
|
let mut failures = vec![];
|
|
let mut total_passed = 0;
|
|
let mut total_failed = 0;
|
|
for mut test_report in test_reports.into_iter() {
|
|
total_passed += test_report.passed;
|
|
total_failed += test_report.failed;
|
|
failures.append(&mut test_report.failures);
|
|
}
|
|
|
|
println!("");
|
|
println!("");
|
|
println!("Spec tests summary report: ");
|
|
println!("total: {}", total_passed + total_failed);
|
|
println!("passed: {}", total_passed);
|
|
println!("failed: {}", total_failed);
|
|
for failure in failures.iter() {
|
|
println!(
|
|
" {:?} {:?} {:?} {:?}",
|
|
failure.file, failure.line, failure.kind, failure.message
|
|
);
|
|
}
|
|
println!("");
|
|
println!("");
|
|
assert!(success, "tests passed")
|
|
}
|
|
|
|
/// Bit pattern of an f32 value:
|
|
/// 1-bit sign + 8-bit mantissa + 23-bit exponent = 32 bits
|
|
///
|
|
/// Bit pattern of an f64 value:
|
|
/// 1-bit sign + 11-bit mantissa + 52-bit exponent = 64 bits
|
|
///
|
|
/// NOTE: On some old platforms (PA-RISC, some MIPS) quiet NaNs (qNaN) have
|
|
/// their mantissa MSB unset and set for signaling NaNs (sNaN).
|
|
///
|
|
/// Links:
|
|
/// * https://en.wikipedia.org/wiki/Floating-point_arithmetic
|
|
/// * https://github.com/WebAssembly/spec/issues/286
|
|
/// * https://en.wikipedia.org/wiki/NaN
|
|
///
|
|
pub trait NaNCheck {
|
|
fn is_quiet_nan(&self) -> bool;
|
|
fn is_canonical_nan(&self) -> bool;
|
|
}
|
|
|
|
impl NaNCheck for f32 {
|
|
/// The MSB of the mantissa must be set for a NaN to be a quiet NaN.
|
|
fn is_quiet_nan(&self) -> bool {
|
|
let bit_mask = 0b1 << 22; // Used to check if 23rd bit is set, which is MSB of the mantissa
|
|
self.is_nan() && (self.to_bits() & bit_mask) == bit_mask
|
|
}
|
|
|
|
/// For a NaN to be canonical, its mantissa bits must all be unset
|
|
fn is_canonical_nan(&self) -> bool {
|
|
let bit_mask: u32 = 0b1____0000_0000____011_1111_1111_1111_1111_1111;
|
|
let masked_value = self.to_bits() ^ bit_mask;
|
|
masked_value == 0xFFFF_FFFF || masked_value == 0x7FFF_FFFF
|
|
}
|
|
}
|
|
|
|
impl NaNCheck for f64 {
|
|
/// The MSB of the mantissa must be set for a NaN to be a quiet NaN.
|
|
fn is_quiet_nan(&self) -> bool {
|
|
let bit_mask = 0b1 << 51; // Used to check if 52st bit is set, which is MSB of the mantissa
|
|
self.is_nan() && (self.to_bits() & bit_mask) == bit_mask
|
|
}
|
|
|
|
/// For a NaN to be canonical, its mantissa bits must all be unset
|
|
fn is_canonical_nan(&self) -> bool {
|
|
let bit_mask: u64 =
|
|
0b1____000_0000_0000____0111_1111_1111_1111_1111_1111_1111_1111_1111_1111_1111_1111_1111;
|
|
let masked_value = self.to_bits() ^ bit_mask;
|
|
masked_value == 0x7FFF_FFFF_FFFF_FFFF || masked_value == 0xFFF_FFFF_FFFF_FFFF
|
|
}
|
|
}
|
|
|
|
}
|