bjorn3
parent
e0f3ad2118
commit
ae98d5a78d
128
src/constant.rs
128
src/constant.rs
@ -1,16 +1,13 @@
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//! Handling of `static`s, `const`s and promoted allocations
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use rustc_span::DUMMY_SP;
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use rustc_ast::Mutability;
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use rustc_data_structures::fx::{FxHashMap, FxHashSet};
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use rustc_errors::ErrorReported;
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use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
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use rustc_middle::mir::interpret::{
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alloc_range, read_target_uint, AllocId, Allocation, ConstValue, ErrorHandled, GlobalAlloc,
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Scalar,
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read_target_uint, AllocId, Allocation, ConstValue, ErrorHandled, GlobalAlloc, Scalar,
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};
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use rustc_middle::ty::ConstKind;
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use rustc_span::DUMMY_SP;
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use cranelift_codegen::ir::GlobalValueData;
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use cranelift_module::*;
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@ -171,65 +168,74 @@ pub(crate) fn codegen_const_value<'tcx>(
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}
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match const_val {
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ConstValue::Scalar(x) => {
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if fx.clif_type(layout.ty).is_none() {
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let (size, align) = (layout.size, layout.align.pref);
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let mut alloc = Allocation::from_bytes(
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std::iter::repeat(0).take(size.bytes_usize()).collect::<Vec<u8>>(),
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align,
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Mutability::Not,
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);
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alloc.write_scalar(fx, alloc_range(Size::ZERO, size), x.into()).unwrap();
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let alloc = fx.tcx.intern_const_alloc(alloc);
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return CValue::by_ref(pointer_for_allocation(fx, alloc), layout);
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}
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ConstValue::Scalar(x) => match x {
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Scalar::Int(int) => {
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if fx.clif_type(layout.ty).is_some() {
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return CValue::const_val(fx, layout, int);
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} else {
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let raw_val = int.to_bits(int.size()).unwrap();
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let val = match int.size().bytes() {
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1 => fx.bcx.ins().iconst(types::I8, raw_val as i64),
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2 => fx.bcx.ins().iconst(types::I16, raw_val as i64),
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4 => fx.bcx.ins().iconst(types::I32, raw_val as i64),
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8 => fx.bcx.ins().iconst(types::I64, raw_val as i64),
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16 => {
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let lsb = fx.bcx.ins().iconst(types::I64, raw_val as u64 as i64);
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let msb =
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fx.bcx.ins().iconst(types::I64, (raw_val >> 64) as u64 as i64);
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fx.bcx.ins().iconcat(lsb, msb)
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}
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_ => unreachable!(),
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};
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match x {
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Scalar::Int(int) => CValue::const_val(fx, layout, int),
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Scalar::Ptr(ptr) => {
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let alloc_kind = fx.tcx.get_global_alloc(ptr.alloc_id);
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let base_addr = match alloc_kind {
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Some(GlobalAlloc::Memory(alloc)) => {
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let data_id = data_id_for_alloc_id(
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&mut fx.constants_cx,
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fx.module,
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ptr.alloc_id,
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alloc.mutability,
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);
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let local_data_id =
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fx.module.declare_data_in_func(data_id, &mut fx.bcx.func);
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if fx.clif_comments.enabled() {
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fx.add_comment(local_data_id, format!("{:?}", ptr.alloc_id));
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}
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fx.bcx.ins().global_value(fx.pointer_type, local_data_id)
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}
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Some(GlobalAlloc::Function(instance)) => {
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let func_id = crate::abi::import_function(fx.tcx, fx.module, instance);
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let local_func_id =
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fx.module.declare_func_in_func(func_id, &mut fx.bcx.func);
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fx.bcx.ins().func_addr(fx.pointer_type, local_func_id)
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}
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Some(GlobalAlloc::Static(def_id)) => {
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assert!(fx.tcx.is_static(def_id));
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let data_id = data_id_for_static(fx.tcx, fx.module, def_id, false);
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let local_data_id =
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fx.module.declare_data_in_func(data_id, &mut fx.bcx.func);
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if fx.clif_comments.enabled() {
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fx.add_comment(local_data_id, format!("{:?}", def_id));
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}
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fx.bcx.ins().global_value(fx.pointer_type, local_data_id)
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}
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None => bug!("missing allocation {:?}", ptr.alloc_id),
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};
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let val = if ptr.offset.bytes() != 0 {
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fx.bcx.ins().iadd_imm(base_addr, i64::try_from(ptr.offset.bytes()).unwrap())
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} else {
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base_addr
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};
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CValue::by_val(val, layout)
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let place = CPlace::new_stack_slot(fx, layout);
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place.to_ptr().store(fx, val, MemFlags::trusted());
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place.to_cvalue(fx)
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}
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}
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}
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Scalar::Ptr(ptr) => {
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let alloc_kind = fx.tcx.get_global_alloc(ptr.alloc_id);
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let base_addr = match alloc_kind {
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Some(GlobalAlloc::Memory(alloc)) => {
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let data_id = data_id_for_alloc_id(
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&mut fx.constants_cx,
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fx.module,
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ptr.alloc_id,
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alloc.mutability,
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);
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let local_data_id =
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fx.module.declare_data_in_func(data_id, &mut fx.bcx.func);
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if fx.clif_comments.enabled() {
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fx.add_comment(local_data_id, format!("{:?}", ptr.alloc_id));
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}
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fx.bcx.ins().global_value(fx.pointer_type, local_data_id)
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}
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Some(GlobalAlloc::Function(instance)) => {
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let func_id = crate::abi::import_function(fx.tcx, fx.module, instance);
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let local_func_id =
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fx.module.declare_func_in_func(func_id, &mut fx.bcx.func);
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fx.bcx.ins().func_addr(fx.pointer_type, local_func_id)
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}
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Some(GlobalAlloc::Static(def_id)) => {
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assert!(fx.tcx.is_static(def_id));
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let data_id = data_id_for_static(fx.tcx, fx.module, def_id, false);
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let local_data_id =
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fx.module.declare_data_in_func(data_id, &mut fx.bcx.func);
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if fx.clif_comments.enabled() {
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fx.add_comment(local_data_id, format!("{:?}", def_id));
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}
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fx.bcx.ins().global_value(fx.pointer_type, local_data_id)
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}
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None => bug!("missing allocation {:?}", ptr.alloc_id),
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};
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let val = if ptr.offset.bytes() != 0 {
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fx.bcx.ins().iadd_imm(base_addr, i64::try_from(ptr.offset.bytes()).unwrap())
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} else {
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base_addr
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};
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CValue::by_val(val, layout)
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}
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},
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ConstValue::ByRef { alloc, offset } => CValue::by_ref(
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pointer_for_allocation(fx, alloc)
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.offset_i64(fx, i64::try_from(offset.bytes()).unwrap()),
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