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cranelift: Fuzz Argument Extensions in clif-fuzzer #4589

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merged 1 commit into from
Aug 9, 2022
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cranelift: Fuzz Argument Extensions in clif-fuzzer #4589

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20 changes: 16 additions & 4 deletions cranelift/fuzzgen/src/function_generator.rs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
use crate::codegen::ir::ValueList;
use crate::codegen::ir::{ArgumentExtension, ArgumentPurpose, ValueList};
use crate::config::Config;
use anyhow::Result;
use arbitrary::{Arbitrary, Unstructured};
Expand Down Expand Up @@ -288,9 +288,21 @@ where
}

fn generate_abi_param(&mut self) -> Result<AbiParam> {
// TODO: Generate more advanced abi params (structs/purposes/extensions/etc...)
let ty = self.generate_type()?;
Ok(AbiParam::new(ty))
let value_type = self.generate_type()?;
// TODO: There are more argument purposes to be explored...
let purpose = ArgumentPurpose::Normal;
let extension = match self.u.int_in_range(0..=2)? {
2 => ArgumentExtension::Sext,
1 => ArgumentExtension::Uext,
_ => ArgumentExtension::None,
};

Ok(AbiParam {
value_type,
purpose,
extension,
legalized_to_pointer: false,
})
}

fn generate_signature(&mut self) -> Result<Signature> {
Expand Down