55 lines
1.6 KiB
Rust
55 lines
1.6 KiB
Rust
//! This module contains everything needed to instantiate an interpreter.
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//! This separation exists to ensure that no fancy miri features like
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//! interpreting common C functions leak into CTFE.
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use super::{
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EvalResult,
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EvalContext,
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Lvalue,
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PrimVal
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};
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use rustc::{mir, ty};
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use syntax::codemap::Span;
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/// Methods of this trait signifies a point where CTFE evaluation would fail
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/// and some use case dependent behaviour can instead be applied
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pub trait Machine<'tcx>: Sized {
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/// Additional data that can be accessed via the EvalContext
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type Data;
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/// Additional data that can be accessed via the Memory
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type MemoryData;
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/// Entry point to all function calls.
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///
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/// Returns Ok(true) when the function was handled completely
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/// e.g. due to missing mir
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///
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/// Returns Ok(false) if a new stack frame was pushed
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fn eval_fn_call<'a>(
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ecx: &mut EvalContext<'a, 'tcx, Self>,
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instance: ty::Instance<'tcx>,
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destination: Option<(Lvalue<'tcx>, mir::BasicBlock)>,
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arg_operands: &[mir::Operand<'tcx>],
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span: Span,
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sig: ty::FnSig<'tcx>,
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) -> EvalResult<'tcx, bool>;
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/// Called when operating on the value of pointers.
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///
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/// Returns `None` if the operation should be handled by the integer
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/// op code
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///
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/// Returns a (value, overflowed) pair otherwise
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fn ptr_op<'a>(
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ecx: &EvalContext<'a, 'tcx, Self>,
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bin_op: mir::BinOp,
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left: PrimVal,
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left_ty: ty::Ty<'tcx>,
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right: PrimVal,
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right_ty: ty::Ty<'tcx>,
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) -> EvalResult<'tcx, Option<(PrimVal, bool)>>;
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}
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