8b18fc5937
This is an incomplete version of a Cranelift IR interpreter: only a small subset of instructions are implemented and (known) missing parts are marked with TODO or FIXME.
83 lines
2.5 KiB
Rust
83 lines
2.5 KiB
Rust
//! Implements the function environment (e.g. a name-to-function mapping) for interpretation.
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use cranelift_codegen::ir::{FuncRef, Function};
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use std::collections::HashMap;
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#[derive(Default)]
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pub struct Environment {
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functions: HashMap<FuncRef, Function>,
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function_name_to_func_ref: HashMap<String, FuncRef>,
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}
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impl From<Function> for Environment {
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fn from(f: Function) -> Self {
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let func_ref = FuncRef::from_u32(0);
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let mut function_name_to_func_ref = HashMap::new();
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function_name_to_func_ref.insert(f.name.to_string(), func_ref);
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let mut functions = HashMap::new();
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functions.insert(func_ref, f);
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Self {
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functions,
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function_name_to_func_ref,
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}
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}
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}
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impl Environment {
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/// Add a function by name.
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pub fn add(&mut self, name: String, function: Function) {
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let func_ref = FuncRef::with_number(self.function_name_to_func_ref.len() as u32)
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.expect("a valid function reference");
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self.function_name_to_func_ref.insert(name, func_ref);
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self.functions.insert(func_ref, function);
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}
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/// Retrieve a reference to a function in the environment by its name.
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pub fn index_of(&self, name: &str) -> Option<FuncRef> {
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self.function_name_to_func_ref.get(name).cloned()
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}
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/// Retrieve a function by its function reference.
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pub fn get_by_func_ref(&self, func_ref: FuncRef) -> Option<&Function> {
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self.functions.get(&func_ref)
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}
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/// Retrieve a function by its name.
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pub fn get_by_name(&self, name: &str) -> Option<&Function> {
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let func_ref = self.index_of(name)?;
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self.get_by_func_ref(func_ref)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use cranelift_codegen::ir::{ExternalName, Signature};
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use cranelift_codegen::isa::CallConv;
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#[test]
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fn addition() {
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let mut env = Environment::default();
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let a = "a";
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let f = Function::new();
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env.add(a.to_string(), f);
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assert!(env.get_by_name(a).is_some());
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}
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#[test]
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fn nonexistence() {
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let env = Environment::default();
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assert!(env.get_by_name("a").is_none());
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}
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#[test]
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fn from() {
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let name = ExternalName::testcase("test");
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let signature = Signature::new(CallConv::Fast);
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let func = Function::with_name_signature(name, signature);
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let env: Environment = func.into();
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assert_eq!(env.index_of("%test"), FuncRef::with_number(0));
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}
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}
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