trans: implement CheckedBinaryOp in mir::constant.
This commit is contained in:
Eduard Burtescu
parent
b8c5053a02
commit
d735f6bf33
@ -12,12 +12,13 @@ use llvm::{self, ValueRef};
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use rustc::middle::const_val::ConstVal;
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use rustc_const_eval::ErrKind;
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use rustc_const_math::ConstInt::*;
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use rustc_const_math::ConstMathErr;
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use rustc::hir::def_id::DefId;
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use rustc::infer::TransNormalize;
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use rustc::mir::repr as mir;
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use rustc::mir::tcx::LvalueTy;
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use rustc::traits;
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use rustc::ty::{self, Ty, TypeFoldable};
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use rustc::ty::{self, Ty, TyCtxt, TypeFoldable};
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use rustc::ty::cast::{CastTy, IntTy};
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use rustc::ty::subst::Substs;
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use {abi, adt, base, Disr};
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@ -713,28 +714,70 @@ impl<'a, 'tcx> MirConstContext<'a, 'tcx> {
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let ty = lhs.ty;
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let binop_ty = self.mir.binop_ty(tcx, op, lhs.ty, rhs.ty);
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let (lhs, rhs) = (lhs.llval, rhs.llval);
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assert!(!ty.is_simd());
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let is_float = ty.is_fp();
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let signed = ty.is_signed();
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if let (Some(lhs), Some(rhs)) = (to_const_int(lhs, ty, tcx),
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to_const_int(rhs, ty, tcx)) {
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let result = match op {
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mir::BinOp::Add => lhs + rhs,
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mir::BinOp::Sub => lhs - rhs,
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mir::BinOp::Mul => lhs * rhs,
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mir::BinOp::Div => lhs / rhs,
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mir::BinOp::Rem => lhs % rhs,
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mir::BinOp::Shl => lhs << rhs,
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mir::BinOp::Shr => lhs >> rhs,
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_ => Ok(lhs)
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};
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consts::const_err(self.ccx, span,
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result.map_err(ErrKind::Math),
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TrueConst::Yes)?;
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Const::new(const_scalar_binop(op, lhs, rhs, ty), binop_ty)
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}
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let llval = unsafe {
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mir::Rvalue::CheckedBinaryOp(op, ref lhs, ref rhs) => {
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let lhs = self.const_operand(lhs, span)?;
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let rhs = self.const_operand(rhs, span)?;
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let ty = lhs.ty;
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let val_ty = self.mir.binop_ty(tcx, op, lhs.ty, rhs.ty);
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let binop_ty = tcx.mk_tup(vec![val_ty, tcx.types.bool]);
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let (lhs, rhs) = (lhs.llval, rhs.llval);
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assert!(!ty.is_fp());
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match const_scalar_checked_binop(tcx, op, lhs, rhs, ty) {
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Some((llval, of)) => {
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let llof = C_bool(self.ccx, of);
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Const::new(C_struct(self.ccx, &[llval, llof], false), binop_ty)
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}
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None => {
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span_bug!(span, "{:?} got non-integer operands: {:?} and {:?}",
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rvalue, Value(lhs), Value(rhs));
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}
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}
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}
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mir::Rvalue::UnaryOp(op, ref operand) => {
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let operand = self.const_operand(operand, span)?;
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let lloperand = operand.llval;
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let llval = match op {
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mir::UnOp::Not => {
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unsafe {
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llvm::LLVMConstNot(lloperand)
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}
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}
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mir::UnOp::Neg => {
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let is_float = operand.ty.is_fp();
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unsafe {
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if is_float {
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llvm::LLVMConstFNeg(lloperand)
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} else {
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llvm::LLVMConstNeg(lloperand)
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}
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}
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}
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};
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Const::new(llval, operand.ty)
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}
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_ => span_bug!(span, "{:?} in constant", rvalue)
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};
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Ok(val)
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}
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}
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pub fn const_scalar_binop(op: mir::BinOp,
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lhs: ValueRef,
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rhs: ValueRef,
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input_ty: Ty) -> ValueRef {
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assert!(!input_ty.is_simd());
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let is_float = input_ty.is_fp();
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let signed = input_ty.is_signed();
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unsafe {
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match op {
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mir::BinOp::Add if is_float => llvm::LLVMConstFAdd(lhs, rhs),
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mir::BinOp::Add => llvm::LLVMConstAdd(lhs, rhs),
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@ -778,42 +821,41 @@ impl<'a, 'tcx> MirConstContext<'a, 'tcx> {
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}
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}
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}
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};
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Const::new(llval, binop_ty)
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}
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}
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mir::Rvalue::UnaryOp(op, ref operand) => {
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let operand = self.const_operand(operand, span)?;
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let lloperand = operand.llval;
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let llval = match op {
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mir::UnOp::Not => {
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unsafe {
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llvm::LLVMConstNot(lloperand)
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pub fn const_scalar_checked_binop<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
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op: mir::BinOp,
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lllhs: ValueRef,
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llrhs: ValueRef,
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input_ty: Ty<'tcx>)
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-> Option<(ValueRef, bool)> {
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if let (Some(lhs), Some(rhs)) = (to_const_int(lllhs, input_ty, tcx),
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to_const_int(llrhs, input_ty, tcx)) {
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let result = match op {
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mir::BinOp::Add => lhs + rhs,
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mir::BinOp::Sub => lhs - rhs,
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mir::BinOp::Mul => lhs * rhs,
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mir::BinOp::Shl => lhs << rhs,
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mir::BinOp::Shr => lhs >> rhs,
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_ => {
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bug!("Operator `{:?}` is not a checkable operator", op)
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}
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};
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let of = match result {
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Ok(_) => false,
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Err(ConstMathErr::Overflow(_)) |
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Err(ConstMathErr::ShiftNegative) => true,
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Err(err) => {
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bug!("Operator `{:?}` on `{:?}` and `{:?}` errored: {}",
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op, lhs, rhs, err.description());
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}
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mir::UnOp::Neg => {
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if let Some(cval) = to_const_int(lloperand, operand.ty, tcx) {
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consts::const_err(self.ccx, span,
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(-cval).map_err(ErrKind::Math),
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TrueConst::Yes)?;
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}
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let is_float = operand.ty.is_fp();
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unsafe {
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if is_float {
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llvm::LLVMConstFNeg(lloperand)
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};
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Some((const_scalar_binop(op, lllhs, llrhs, input_ty), of))
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} else {
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llvm::LLVMConstNeg(lloperand)
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}
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}
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}
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};
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Const::new(llval, operand.ty)
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}
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_ => span_bug!(span, "{:?} in constant", rvalue)
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};
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Ok(val)
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None
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}
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}
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