--- /dev/null
+use syntax::ast;
+use rustc::ty::{self, Ty, TyCtxt, ParamEnv};
+use syntax_pos::symbol::Symbol;
+use rustc::mir::interpret::{ConstValue, Scalar};
+
+#[derive(PartialEq)]
+crate enum LitToConstError {
+ UnparseableFloat,
+ Reported,
+}
+
+crate fn lit_to_const<'a, 'gcx, 'tcx>(
+ lit: &'tcx ast::LitKind,
+ tcx: TyCtxt<'a, 'gcx, 'tcx>,
+ ty: Ty<'tcx>,
+ neg: bool,
+) -> Result<&'tcx ty::Const<'tcx>, LitToConstError> {
+ use syntax::ast::*;
+
+ let trunc = |n| {
+ let param_ty = ParamEnv::reveal_all().and(tcx.lift_to_global(&ty).unwrap());
+ let width = tcx.layout_of(param_ty).map_err(|_| LitToConstError::Reported)?.size;
+ trace!("trunc {} with size {} and shift {}", n, width.bits(), 128 - width.bits());
+ let shift = 128 - width.bits();
+ let result = (n << shift) >> shift;
+ trace!("trunc result: {}", result);
+ Ok(ConstValue::Scalar(Scalar::Bits {
+ bits: result,
+ size: width.bytes() as u8,
+ }))
+ };
+
+ use rustc::mir::interpret::*;
+ let lit = match *lit {
+ LitKind::Str(ref s, _) => {
+ let s = s.as_str();
+ let id = tcx.allocate_bytes(s.as_bytes());
+ ConstValue::new_slice(Scalar::Ptr(id.into()), s.len() as u64, &tcx)
+ },
+ LitKind::ByteStr(ref data) => {
+ let id = tcx.allocate_bytes(data);
+ ConstValue::Scalar(Scalar::Ptr(id.into()))
+ },
+ LitKind::Byte(n) => ConstValue::Scalar(Scalar::Bits {
+ bits: n as u128,
+ size: 1,
+ }),
+ LitKind::Int(n, _) if neg => {
+ let n = n as i128;
+ let n = n.overflowing_neg().0;
+ trunc(n as u128)?
+ },
+ LitKind::Int(n, _) => trunc(n)?,
+ LitKind::Float(n, fty) => {
+ parse_float(n, fty, neg).map_err(|_| LitToConstError::UnparseableFloat)?
+ }
+ LitKind::FloatUnsuffixed(n) => {
+ let fty = match ty.sty {
+ ty::Float(fty) => fty,
+ _ => bug!()
+ };
+ parse_float(n, fty, neg).map_err(|_| LitToConstError::UnparseableFloat)?
+ }
+ LitKind::Bool(b) => ConstValue::Scalar(Scalar::from_bool(b)),
+ LitKind::Char(c) => ConstValue::Scalar(Scalar::from_char(c)),
+ };
+ Ok(ty::Const::from_const_value(tcx, lit, ty))
+}
+
+fn parse_float<'tcx>(
+ num: Symbol,
+ fty: ast::FloatTy,
+ neg: bool,
+) -> Result<ConstValue<'tcx>, ()> {
+ let num = num.as_str();
+ use rustc_apfloat::ieee::{Single, Double};
+ use rustc_apfloat::Float;
+ let (bits, size) = match fty {
+ ast::FloatTy::F32 => {
+ num.parse::<f32>().map_err(|_| ())?;
+ let mut f = num.parse::<Single>().unwrap_or_else(|e| {
+ panic!("apfloat::ieee::Single failed to parse `{}`: {:?}", num, e)
+ });
+ if neg {
+ f = -f;
+ }
+ (f.to_bits(), 4)
+ }
+ ast::FloatTy::F64 => {
+ num.parse::<f64>().map_err(|_| ())?;
+ let mut f = num.parse::<Double>().unwrap_or_else(|e| {
+ panic!("apfloat::ieee::Single failed to parse `{}`: {:?}", num, e)
+ });
+ if neg {
+ f = -f;
+ }
+ (f.to_bits(), 8)
+ }
+ };
+
+ Ok(ConstValue::Scalar(Scalar::Bits { bits, size }))
+}
use const_eval::{const_field, const_variant_index};
use hair::util::UserAnnotatedTyHelpers;
+use hair::constant::*;
use rustc::mir::{fmt_const_val, Field, BorrowKind, Mutability};
use rustc::mir::{ProjectionElem, UserTypeAnnotation, UserTypeProjection, UserTypeProjections};
use rustc::mir::interpret::{Scalar, GlobalId, ConstValue, sign_extend};
-use rustc::ty::{self, Region, TyCtxt, AdtDef, Ty, ParamEnv};
+use rustc::ty::{self, Region, TyCtxt, AdtDef, Ty};
use rustc::ty::subst::{Substs, Kind};
use rustc::ty::layout::VariantIdx;
use rustc::hir::{self, PatKind, RangeEnd};
use syntax::ast;
use syntax::ptr::P;
use syntax_pos::Span;
-use syntax_pos::symbol::Symbol;
#[derive(Clone, Debug)]
pub enum PatternError {
fallback()
}
-
-#[derive(PartialEq)]
-pub enum LitToConstError {
- UnparseableFloat,
- Reported,
-}
-
-pub fn lit_to_const<'a, 'gcx, 'tcx>(
- lit: &'tcx ast::LitKind,
- tcx: TyCtxt<'a, 'gcx, 'tcx>,
- ty: Ty<'tcx>,
- neg: bool,
-) -> Result<&'tcx ty::Const<'tcx>, LitToConstError> {
- use syntax::ast::*;
-
- let trunc = |n| {
- let param_ty = ParamEnv::reveal_all().and(tcx.lift_to_global(&ty).unwrap());
- let width = tcx.layout_of(param_ty).map_err(|_| LitToConstError::Reported)?.size;
- trace!("trunc {} with size {} and shift {}", n, width.bits(), 128 - width.bits());
- let shift = 128 - width.bits();
- let result = (n << shift) >> shift;
- trace!("trunc result: {}", result);
- Ok(ConstValue::Scalar(Scalar::Bits {
- bits: result,
- size: width.bytes() as u8,
- }))
- };
-
- use rustc::mir::interpret::*;
- let lit = match *lit {
- LitKind::Str(ref s, _) => {
- let s = s.as_str();
- let id = tcx.allocate_bytes(s.as_bytes());
- ConstValue::new_slice(Scalar::Ptr(id.into()), s.len() as u64, &tcx)
- },
- LitKind::ByteStr(ref data) => {
- let id = tcx.allocate_bytes(data);
- ConstValue::Scalar(Scalar::Ptr(id.into()))
- },
- LitKind::Byte(n) => ConstValue::Scalar(Scalar::Bits {
- bits: n as u128,
- size: 1,
- }),
- LitKind::Int(n, _) if neg => {
- let n = n as i128;
- let n = n.overflowing_neg().0;
- trunc(n as u128)?
- },
- LitKind::Int(n, _) => trunc(n)?,
- LitKind::Float(n, fty) => {
- parse_float(n, fty, neg).map_err(|_| LitToConstError::UnparseableFloat)?
- }
- LitKind::FloatUnsuffixed(n) => {
- let fty = match ty.sty {
- ty::Float(fty) => fty,
- _ => bug!()
- };
- parse_float(n, fty, neg).map_err(|_| LitToConstError::UnparseableFloat)?
- }
- LitKind::Bool(b) => ConstValue::Scalar(Scalar::from_bool(b)),
- LitKind::Char(c) => ConstValue::Scalar(Scalar::from_char(c)),
- };
- Ok(ty::Const::from_const_value(tcx, lit, ty))
-}
-
-pub fn parse_float<'tcx>(
- num: Symbol,
- fty: ast::FloatTy,
- neg: bool,
-) -> Result<ConstValue<'tcx>, ()> {
- let num = num.as_str();
- use rustc_apfloat::ieee::{Single, Double};
- use rustc_apfloat::Float;
- let (bits, size) = match fty {
- ast::FloatTy::F32 => {
- num.parse::<f32>().map_err(|_| ())?;
- let mut f = num.parse::<Single>().unwrap_or_else(|e| {
- panic!("apfloat::ieee::Single failed to parse `{}`: {:?}", num, e)
- });
- if neg {
- f = -f;
- }
- (f.to_bits(), 4)
- }
- ast::FloatTy::F64 => {
- num.parse::<f64>().map_err(|_| ())?;
- let mut f = num.parse::<Double>().unwrap_or_else(|e| {
- panic!("apfloat::ieee::Single failed to parse `{}`: {:?}", num, e)
- });
- if neg {
- f = -f;
- }
- (f.to_bits(), 8)
- }
- };
-
- Ok(ConstValue::Scalar(Scalar::Bits { bits, size }))
-}