remove extensions crate

Signed-off-by: xermicus <cyrill@parity.io>

Cargo.lock

@@ -1718,13 +1718,6 @@ dependencies = [
  "primitive-types",
 ]
 
-[[package]]
-name = "revive-extensions"
-version = "0.1.0"
-dependencies = [
- "inkwell",
-]
-
 [[package]]
 name = "revive-integration"
 version = "0.1.0"

crates/extensions/Cargo.toml

@@ -1,9 +0,0 @@
-[package]
-name = "revive-extensions"
-version = "0.1.0"
-edition = "2021"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[dependencies]
-inkwell = { workspace = true, features = ["target-riscv", "no-libffi-linking", "llvm18-0"] }

crates/extensions/bswap.ll

@@ -1,13 +0,0 @@
-target datalayout = "e-m:e-p:32:32-i64:64-n32-S128"
-target triple = "riscv32-unknown-unknown-elf"
-
-define dso_local noundef i256 @__bswap(i256 noundef %0) local_unnamed_addr #0 {
-  %2 = tail call i256 @llvm.bswap.i256(i256 %0)
-  ret i256 %2
-}
-
-; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
-declare i256 @llvm.bswap.i256(i256) #1
-
-attributes #0 = { alwaysinline mustprogress nofree norecurse nosync nounwind willreturn memory(none) }
-attributes #1 = { mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none) }

crates/extensions/build.rs

@@ -1,40 +0,0 @@
-use std::{env, fs, path::Path, process::Command};
-
-fn compile(source_path: &str, output_path: &str) {
-    let output = Command::new("llc")
-        .args([
-            "-O3",
-            "-filetype=asm",
-            "-mattr=+zbb,+e",
-            source_path,
-            "-o",
-            output_path,
-        ])
-        .output()
-        .expect("should be able to invoke llc");
-
-    assert!(
-        output.status.success(),
-        "failed to compile {}: {:?}",
-        source_path,
-        output
-    );
-}
-
-fn main() {
-    let in_file = "bswap.ll";
-    let out_file = "bswap.s";
-    let out_dir = env::var_os("OUT_DIR").expect("env should have $OUT_DIR");
-    let out_path = Path::new(&out_dir).join(out_file);
-    compile(
-        in_file,
-        out_path.to_str().expect("$OUT_DIR should be UTF-8"),
-    );
-
-    let src_path = Path::new(&out_dir).join("bswap.rs");
-    let src = format!("pub static ASSEMBLY: &str = include_str!(\"{out_file}\");");
-    fs::write(src_path, src).expect("should be able to write in $OUT_DIR");
-
-    println!("cargo:rerun-if-changed=build.rs");
-    println!("cargo:rerun-if-changed=bswap.ll");
-}

crates/extensions/src/lib.rs

@@ -1,39 +0,0 @@
-//! Custom RISC-V extension in PolkaVM that are partially supported.
-//! We use inline assembly to emit partially supported instructions.
-
-use inkwell::{context::Context, module::Module, support::LLVMString};
-
-include!(concat!(env!("OUT_DIR"), "/bswap.rs"));
-
-/// Returns a LLVM module containing a `__bswap` function, which
-/// - Takes a `i256` value argument
-/// - Byte swaps it using `rev8` from the `zbb` extension
-/// - Returns the `i256` value
-/// Returns `Error` if the module fails to validate, which should never happen.
-pub fn module<'context>(
-    context: &'context Context,
-    module_name: &str,
-) -> Result<Module<'context>, LLVMString> {
-    let module = context.create_module(module_name);
-
-    module.set_inline_assembly(ASSEMBLY);
-    module.verify()?;
-
-    Ok(module)
-}
-
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn assembly_contains_rev8_instruction() {
-        assert!(crate::ASSEMBLY.contains("rev8"));
-    }
-
-    #[test]
-    fn module_is_valid() {
-        inkwell::targets::Target::initialize_riscv(&Default::default());
-        let context = inkwell::context::Context::create();
-
-        assert!(crate::module(&context, "polkavm_bswap").is_ok());
-    }
-}