72 lines
2.4 KiB
Rust
72 lines
2.4 KiB
Rust
//! Allocator shim
|
|
// Adapted from rustc
|
|
|
|
use crate::prelude::*;
|
|
|
|
use rustc_ast::expand::allocator::{AllocatorKind, AllocatorTy, ALLOCATOR_METHODS};
|
|
use rustc_codegen_ssa::base::allocator_kind_for_codegen;
|
|
use rustc_session::config::OomStrategy;
|
|
|
|
/// Returns whether an allocator shim was created
|
|
pub(crate) fn codegen(
|
|
tcx: TyCtxt<'_>,
|
|
module: &mut impl Module,
|
|
unwind_context: &mut UnwindContext,
|
|
) -> bool {
|
|
let Some(kind) = allocator_kind_for_codegen(tcx) else { return false };
|
|
codegen_inner(module, unwind_context, kind, tcx.sess.opts.unstable_opts.oom);
|
|
true
|
|
}
|
|
|
|
fn codegen_inner(
|
|
module: &mut impl Module,
|
|
unwind_context: &mut UnwindContext,
|
|
kind: AllocatorKind,
|
|
oom_strategy: OomStrategy,
|
|
) {
|
|
let usize_ty = module.target_config().pointer_type();
|
|
|
|
for method in ALLOCATOR_METHODS {
|
|
let mut arg_tys = Vec::with_capacity(method.inputs.len());
|
|
for ty in method.inputs.iter() {
|
|
match *ty {
|
|
AllocatorTy::Layout => {
|
|
arg_tys.push(usize_ty); // size
|
|
arg_tys.push(usize_ty); // align
|
|
}
|
|
AllocatorTy::Ptr => arg_tys.push(usize_ty),
|
|
AllocatorTy::Usize => arg_tys.push(usize_ty),
|
|
|
|
AllocatorTy::ResultPtr | AllocatorTy::Unit => panic!("invalid allocator arg"),
|
|
}
|
|
}
|
|
let output = match method.output {
|
|
AllocatorTy::ResultPtr => Some(usize_ty),
|
|
AllocatorTy::Unit => None,
|
|
|
|
AllocatorTy::Layout | AllocatorTy::Usize | AllocatorTy::Ptr => {
|
|
panic!("invalid allocator output")
|
|
}
|
|
};
|
|
|
|
let sig = Signature {
|
|
call_conv: module.target_config().default_call_conv,
|
|
params: arg_tys.iter().cloned().map(AbiParam::new).collect(),
|
|
returns: output.into_iter().map(AbiParam::new).collect(),
|
|
};
|
|
crate::common::create_wrapper_function(
|
|
module,
|
|
unwind_context,
|
|
sig,
|
|
&format!("__rust_{}", method.name),
|
|
&kind.fn_name(method.name),
|
|
);
|
|
}
|
|
|
|
let data_id = module.declare_data(OomStrategy::SYMBOL, Linkage::Export, false, false).unwrap();
|
|
let mut data_ctx = DataContext::new();
|
|
data_ctx.set_align(1);
|
|
let val = oom_strategy.should_panic();
|
|
data_ctx.define(Box::new([val]));
|
|
module.define_data(data_id, &data_ctx).unwrap();
|
|
}
|