Crate cranelift_isle

ISLE: Instruction Selection / Lowering Expressions

ISLE is a domain specific language (DSL) for instruction selection and lowering clif instructions to vcode’s MachInsts in Cranelift.

ISLE is a statically-typed term-rewriting language. You define rewriting rules that map input terms (clif instructions) into output terms (MachInsts). These rules get compiled down into Rust source test that uses a tree of match expressions that is as good or better than what you would have written by hand.

Modules

• ast
  Abstract syntax tree (AST) created from parsed ISLE.
• codegen
  Generate Rust code from a series of Sequences.
• compile
  Compilation process, from AST to Sema to Sequences of Insts.
• error
  Error types.
• ir
  Lowered matching IR.
• lexer
  Lexer for the ISLE language.
• overlap
  Overlap detection for rules in ISLE.
• parser
  Parser for ISLE language.
• sema
  Semantic analysis.
• trie
  Trie construction.
• trie_again
  A strongly-normalizing intermediate representation for ISLE rules. This representation is chosen to closely reflect the operations we can implement in Rust, to make code generation easy.

Macros

• log
  Log a compiler-internal message for debugging purposes.

Structs

• DisjointSets
  Stores disjoint sets and provides efficient operations to merge two sets, and to find a representative member of a set given any member of that set. In this implementation, sets always have at least two members, and can only be formed by the merge operation.
• StableMap
  A wrapper around a HashMap which prevents accidentally observing the non-deterministic iteration order.