123 lines
5.1 KiB
Rust
123 lines
5.1 KiB
Rust
use rustc::mir;
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use rustc_errors::struct_span_err;
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use super::FunctionCx;
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use super::LocalRef;
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use super::OperandValue;
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use crate::traits::BuilderMethods;
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use crate::traits::*;
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use rustc_error_codes::*;
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impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
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pub fn codegen_statement(&mut self, mut bx: Bx, statement: &mir::Statement<'tcx>) -> Bx {
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debug!("codegen_statement(statement={:?})", statement);
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self.set_debug_loc(&mut bx, statement.source_info);
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match statement.kind {
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mir::StatementKind::Assign(box (ref place, ref rvalue)) => {
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if let Some(index) = place.as_local() {
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match self.locals[index] {
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LocalRef::Place(cg_dest) => self.codegen_rvalue(bx, cg_dest, rvalue),
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LocalRef::UnsizedPlace(cg_indirect_dest) => {
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self.codegen_rvalue_unsized(bx, cg_indirect_dest, rvalue)
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}
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LocalRef::Operand(None) => {
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let (mut bx, operand) = self.codegen_rvalue_operand(bx, rvalue);
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self.locals[index] = LocalRef::Operand(Some(operand));
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self.debug_introduce_local(&mut bx, index);
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bx
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}
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LocalRef::Operand(Some(op)) => {
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if !op.layout.is_zst() {
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span_bug!(
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statement.source_info.span,
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"operand {:?} already assigned",
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rvalue
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);
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}
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// If the type is zero-sized, it's already been set here,
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// but we still need to make sure we codegen the operand
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self.codegen_rvalue_operand(bx, rvalue).0
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}
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}
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} else {
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let cg_dest = self.codegen_place(&mut bx, &place.as_ref());
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self.codegen_rvalue(bx, cg_dest, rvalue)
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}
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}
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mir::StatementKind::SetDiscriminant { box ref place, variant_index } => {
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self.codegen_place(&mut bx, &place.as_ref())
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.codegen_set_discr(&mut bx, variant_index);
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bx
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}
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mir::StatementKind::StorageLive(local) => {
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if let LocalRef::Place(cg_place) = self.locals[local] {
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cg_place.storage_live(&mut bx);
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} else if let LocalRef::UnsizedPlace(cg_indirect_place) = self.locals[local] {
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cg_indirect_place.storage_live(&mut bx);
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}
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bx
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}
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mir::StatementKind::StorageDead(local) => {
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if let LocalRef::Place(cg_place) = self.locals[local] {
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cg_place.storage_dead(&mut bx);
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} else if let LocalRef::UnsizedPlace(cg_indirect_place) = self.locals[local] {
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cg_indirect_place.storage_dead(&mut bx);
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}
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bx
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}
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mir::StatementKind::InlineAsm(ref asm) => {
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let outputs = asm
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.outputs
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.iter()
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.map(|output| self.codegen_place(&mut bx, &output.as_ref()))
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.collect();
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let input_vals = asm.inputs.iter().fold(
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Vec::with_capacity(asm.inputs.len()),
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|mut acc, (span, input)| {
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let op = self.codegen_operand(&mut bx, input);
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if let OperandValue::Immediate(_) = op.val {
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acc.push(op.immediate());
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} else {
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struct_span_err!(
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bx.sess(),
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span.to_owned(),
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E0669,
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"invalid value for constraint in inline assembly"
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)
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.emit();
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}
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acc
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},
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);
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if input_vals.len() == asm.inputs.len() {
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let res = bx.codegen_inline_asm(
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&asm.asm,
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outputs,
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input_vals,
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statement.source_info.span,
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);
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if !res {
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struct_span_err!(
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bx.sess(),
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statement.source_info.span,
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E0668,
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"malformed inline assembly"
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)
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.emit();
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}
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}
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bx
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}
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mir::StatementKind::FakeRead(..)
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| mir::StatementKind::Retag { .. }
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| mir::StatementKind::AscribeUserType(..)
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| mir::StatementKind::Nop => bx,
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}
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}
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}
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