a0318f36f0
This PR switches Cranelift over to the new register allocator, regalloc2. See [this document](https://gist.github.com/cfallin/08553421a91f150254fe878f67301801) for a summary of the design changes. This switchover has implications for core VCode/MachInst types and the lowering pass. Overall, this change brings improvements to both compile time and speed of generated code (runtime), as reported in #3942: ``` Benchmark Compilation (wallclock) Execution (wallclock) blake3-scalar 25% faster 28% faster blake3-simd no diff no diff meshoptimizer 19% faster 17% faster pulldown-cmark 17% faster no diff bz2 15% faster no diff SpiderMonkey, 21% faster 2% faster fib(30) clang.wasm 42% faster N/A ```
84 lines
3.3 KiB
Rust
84 lines
3.3 KiB
Rust
//! Result and error types representing the outcome of compiling a function.
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use regalloc2::checker::CheckerErrors;
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use crate::verifier::VerifierErrors;
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use std::string::String;
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/// A compilation error.
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///
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/// When Cranelift fails to compile a function, it will return one of these error codes.
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#[derive(Debug)]
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pub enum CodegenError {
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/// A list of IR verifier errors.
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///
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/// This always represents a bug, either in the code that generated IR for Cranelift, or a bug
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/// in Cranelift itself.
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Verifier(VerifierErrors),
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/// An implementation limit was exceeded.
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///
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/// Cranelift can compile very large and complicated functions, but the [implementation has
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/// limits][limits] that cause compilation to fail when they are exceeded.
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///
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/// [limits]: https://github.com/bytecodealliance/wasmtime/blob/main/cranelift/docs/ir.md#implementation-limits
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ImplLimitExceeded,
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/// The code size for the function is too large.
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///
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/// Different target ISAs may impose a limit on the size of a compiled function. If that limit
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/// is exceeded, compilation fails.
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CodeTooLarge,
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/// Something is not supported by the code generator. This might be an indication that a
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/// feature is used without explicitly enabling it, or that something is temporarily
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/// unsupported by a given target backend.
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Unsupported(String),
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/// A failure to map Cranelift register representation to a DWARF register representation.
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#[cfg(feature = "unwind")]
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RegisterMappingError(crate::isa::unwind::systemv::RegisterMappingError),
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/// Register allocator internal error discovered by the symbolic checker.
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Regalloc(CheckerErrors),
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}
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/// A convenient alias for a `Result` that uses `CodegenError` as the error type.
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pub type CodegenResult<T> = Result<T, CodegenError>;
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// This is manually implementing Error and Display instead of using thiserror to reduce the amount
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// of dependencies used by Cranelift.
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impl std::error::Error for CodegenError {
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fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
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match self {
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CodegenError::Verifier(source) => Some(source),
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CodegenError::ImplLimitExceeded { .. }
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| CodegenError::CodeTooLarge { .. }
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| CodegenError::Unsupported { .. } => None,
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#[cfg(feature = "unwind")]
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CodegenError::RegisterMappingError { .. } => None,
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CodegenError::Regalloc(..) => None,
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}
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}
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}
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impl std::fmt::Display for CodegenError {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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match self {
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CodegenError::Verifier(_) => write!(f, "Verifier errors"),
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CodegenError::ImplLimitExceeded => write!(f, "Implementation limit exceeded"),
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CodegenError::CodeTooLarge => write!(f, "Code for function is too large"),
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CodegenError::Unsupported(feature) => write!(f, "Unsupported feature: {}", feature),
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#[cfg(feature = "unwind")]
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CodegenError::RegisterMappingError(_0) => write!(f, "Register mapping error"),
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CodegenError::Regalloc(errors) => write!(f, "Regalloc validation errors: {:?}", errors),
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}
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}
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}
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impl From<VerifierErrors> for CodegenError {
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fn from(source: VerifierErrors) -> Self {
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CodegenError::Verifier { 0: source }
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}
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}
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