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ctfe interpreter: extend provenance so that it can track whether a pointer is immutable

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This commit is contained in:
Ralf Jung
2023-11-25 18:41:53 +01:00
parent 85a4bd8f58
commit cb86303342
38 changed files with 261 additions and 145 deletions
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16
compiler/rustc_const_eval/src/interpret/eval_context.rs
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@@ -7,7 +7,9 @@ use hir::CRATE_HIR_ID;
use rustc_hir::{self as hir, def_id::DefId, definitions::DefPathData};
use rustc_index::IndexVec;
use rustc_middle::mir;
use rustc_middle::mir::interpret::{ErrorHandled, InvalidMetaKind, ReportedErrorInfo};
use rustc_middle::mir::interpret::{
CtfeProvenance, ErrorHandled, InvalidMetaKind, ReportedErrorInfo,
};
use rustc_middle::query::TyCtxtAt;
use rustc_middle::ty::layout::{
self, FnAbiError, FnAbiOfHelpers, FnAbiRequest, LayoutError, LayoutOf, LayoutOfHelpers,
@@ -20,9 +22,9 @@ use rustc_span::Span;
use rustc_target::abi::{call::FnAbi, Align, HasDataLayout, Size, TargetDataLayout};
use super::{
AllocId, GlobalId, Immediate, InterpErrorInfo, InterpResult, MPlaceTy, Machine, MemPlace,
MemPlaceMeta, Memory, MemoryKind, OpTy, Operand, Place, PlaceTy, Pointer, PointerArithmetic,
Projectable, Provenance, Scalar, StackPopJump,
GlobalId, Immediate, InterpErrorInfo, InterpResult, MPlaceTy, Machine, MemPlace, MemPlaceMeta,
Memory, MemoryKind, OpTy, Operand, Place, PlaceTy, Pointer, PointerArithmetic, Projectable,
Provenance, Scalar, StackPopJump,
};
use crate::errors;
use crate::util;
@@ -84,7 +86,7 @@ impl Drop for SpanGuard {
}
/// A stack frame.
pub struct Frame<'mir, 'tcx, Prov: Provenance = AllocId, Extra = ()> {
pub struct Frame<'mir, 'tcx, Prov: Provenance = CtfeProvenance, Extra = ()> {
////////////////////////////////////////////////////////////////////////////////
// Function and callsite information
////////////////////////////////////////////////////////////////////////////////
@@ -156,7 +158,7 @@ pub enum StackPopCleanup {
/// State of a local variable including a memoized layout
#[derive(Clone)]
pub struct LocalState<'tcx, Prov: Provenance = AllocId> {
pub struct LocalState<'tcx, Prov: Provenance = CtfeProvenance> {
value: LocalValue<Prov>,
/// Don't modify if `Some`, this is only used to prevent computing the layout twice.
/// Avoids computing the layout of locals that are never actually initialized.
@@ -177,7 +179,7 @@ impl<Prov: Provenance> std::fmt::Debug for LocalState<'_, Prov> {
/// This does not store the type of the local; the type is given by `body.local_decls` and can never
/// change, so by not storing here we avoid having to maintain that as an invariant.
#[derive(Copy, Clone, Debug)] // Miri debug-prints these
pub(super) enum LocalValue<Prov: Provenance = AllocId> {
pub(super) enum LocalValue<Prov: Provenance = CtfeProvenance> {
/// This local is not currently alive, and cannot be used at all.
Dead,
/// A normal, live local.