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#[cfg(feature="master")]
use gccjit::FnAttribute;
use gccjit::{Context, FunctionType, GlobalKind, ToRValue, Type};
use rustc_ast::expand::allocator::{
alloc_error_handler_name, default_fn_name, global_fn_name, AllocatorKind, AllocatorTy,
ALLOCATOR_METHODS, NO_ALLOC_SHIM_IS_UNSTABLE,
};
use rustc_middle::bug;
use rustc_middle::ty::TyCtxt;
use rustc_session::config::OomStrategy;
use crate::GccContext;
pub(crate) unsafe fn codegen(tcx: TyCtxt<'_>, mods: &mut GccContext, _module_name: &str, kind: AllocatorKind, alloc_error_handler_kind: AllocatorKind) {
let context = &mods.context;
let usize =
match tcx.sess.target.pointer_width {
16 => context.new_type::<u16>(),
32 => context.new_type::<u32>(),
64 => context.new_type::<u64>(),
tws => bug!("Unsupported target word size for int: {}", tws),
};
let i8 = context.new_type::<i8>();
let i8p = i8.make_pointer();
if kind == AllocatorKind::Default {
for method in ALLOCATOR_METHODS {
let mut types = Vec::with_capacity(method.inputs.len());
for input in method.inputs.iter() {
match input.ty {
AllocatorTy::Layout => {
types.push(usize);
types.push(usize);
}
AllocatorTy::Ptr => types.push(i8p),
AllocatorTy::Usize => types.push(usize),
AllocatorTy::ResultPtr | AllocatorTy::Unit => panic!("invalid allocator arg"),
}
}
let output = match method.output {
AllocatorTy::ResultPtr => Some(i8p),
AllocatorTy::Unit => None,
AllocatorTy::Layout | AllocatorTy::Usize | AllocatorTy::Ptr => {
panic!("invalid allocator output")
}
};
let from_name = global_fn_name(method.name);
let to_name = default_fn_name(method.name);
create_wrapper_function(tcx, context, &from_name, &to_name, &types, output);
}
}
// FIXME(bjorn3): Add noreturn attribute
create_wrapper_function(
tcx,
context,
"__rust_alloc_error_handler",
&alloc_error_handler_name(alloc_error_handler_kind),
&[usize, usize],
None,
);
let name = OomStrategy::SYMBOL.to_string();
let global = context.new_global(None, GlobalKind::Exported, i8, name);
let value = tcx.sess.opts.unstable_opts.oom.should_panic();
let value = context.new_rvalue_from_int(i8, value as i32);
global.global_set_initializer_rvalue(value);
let name = NO_ALLOC_SHIM_IS_UNSTABLE.to_string();
let global = context.new_global(None, GlobalKind::Exported, i8, name);
let value = context.new_rvalue_from_int(i8, 0);
global.global_set_initializer_rvalue(value);
}
fn create_wrapper_function(
tcx: TyCtxt<'_>,
context: &Context<'_>,
from_name: &str,
to_name: &str,
types: &[Type<'_>],
output: Option<Type<'_>>,
) {
let void = context.new_type::<()>();
let args: Vec<_> = types.iter().enumerate()
.map(|(index, typ)| context.new_parameter(None, *typ, &format!("param{}", index)))
.collect();
let func = context.new_function(None, FunctionType::Exported, output.unwrap_or(void), &args, from_name, false);
if tcx.sess.default_hidden_visibility() {
#[cfg(feature="master")]
func.add_attribute(FnAttribute::Visibility(gccjit::Visibility::Hidden));
}
if tcx.sess.must_emit_unwind_tables() {
// TODO(antoyo): emit unwind tables.
}
let args: Vec<_> = types.iter().enumerate()
.map(|(index, typ)| context.new_parameter(None, *typ, &format!("param{}", index)))
.collect();
let callee = context.new_function(None, FunctionType::Extern, output.unwrap_or(void), &args, to_name, false);
#[cfg(feature="master")]
callee.add_attribute(FnAttribute::Visibility(gccjit::Visibility::Hidden));
let block = func.new_block("entry");
let args = args
.iter()
.enumerate()
.map(|(i, _)| func.get_param(i as i32).to_rvalue())
.collect::<Vec<_>>();
let ret = context.new_call(None, callee, &args);
//llvm::LLVMSetTailCall(ret, True);
if output.is_some() {
block.end_with_return(None, ret);
}
else {
block.end_with_void_return(None);
}
// TODO(@Commeownist): Check if we need to emit some extra debugging info in certain circumstances
// as described in https://github.com/rust-lang/rust/commit/77a96ed5646f7c3ee8897693decc4626fe380643
}
|
