86 lines
2.7 KiB
Rust
86 lines
2.7 KiB
Rust
use cranelift::prelude::*;
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use cranelift_codegen::binemit::NullTrapSink;
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use cranelift_module::{default_libcall_names, Linkage, Module};
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use cranelift_simplejit::{SimpleJITBuilder, SimpleJITModule};
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use std::mem;
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fn main() {
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let mut module: SimpleJITModule =
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SimpleJITModule::new(SimpleJITBuilder::new(default_libcall_names()));
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let mut ctx = module.make_context();
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let mut func_ctx = FunctionBuilderContext::new();
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let mut sig_a = module.make_signature();
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sig_a.params.push(AbiParam::new(types::I32));
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sig_a.returns.push(AbiParam::new(types::I32));
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let mut sig_b = module.make_signature();
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sig_b.returns.push(AbiParam::new(types::I32));
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let func_a = module
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.declare_function("a", Linkage::Local, &sig_a)
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.unwrap();
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let func_b = module
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.declare_function("b", Linkage::Local, &sig_b)
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.unwrap();
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ctx.func.signature = sig_a;
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ctx.func.name = ExternalName::user(0, func_a.as_u32());
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{
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let mut bcx: FunctionBuilder = FunctionBuilder::new(&mut ctx.func, &mut func_ctx);
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let block = bcx.create_block();
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bcx.switch_to_block(block);
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bcx.append_block_params_for_function_params(block);
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let param = bcx.block_params(block)[0];
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let cst = bcx.ins().iconst(types::I32, 37);
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let add = bcx.ins().iadd(cst, param);
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bcx.ins().return_(&[add]);
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bcx.seal_all_blocks();
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bcx.finalize();
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}
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let mut trap_sink = NullTrapSink {};
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module
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.define_function(func_a, &mut ctx, &mut trap_sink)
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.unwrap();
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module.clear_context(&mut ctx);
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ctx.func.signature = sig_b;
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ctx.func.name = ExternalName::user(0, func_b.as_u32());
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{
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let mut bcx: FunctionBuilder = FunctionBuilder::new(&mut ctx.func, &mut func_ctx);
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let block = bcx.create_block();
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bcx.switch_to_block(block);
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let local_func = module.declare_func_in_func(func_a, &mut bcx.func);
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let arg = bcx.ins().iconst(types::I32, 5);
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let call = bcx.ins().call(local_func, &[arg]);
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let value = {
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let results = bcx.inst_results(call);
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assert_eq!(results.len(), 1);
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results[0].clone()
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};
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bcx.ins().return_(&[value]);
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bcx.seal_all_blocks();
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bcx.finalize();
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}
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module
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.define_function(func_b, &mut ctx, &mut trap_sink)
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.unwrap();
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module.clear_context(&mut ctx);
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// Perform linking.
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module.finalize_definitions();
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// Get a raw pointer to the generated code.
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let code_b = module.get_finalized_function(func_b);
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// Cast it to a rust function pointer type.
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let ptr_b = unsafe { mem::transmute::<_, fn() -> u32>(code_b) };
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// Call it!
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let res = ptr_b();
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assert_eq!(res, 42);
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}
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