34765c97d7
We now use `mapM`, `foldlM`, ... like Haskell. Motivation: fixes the inconsistent naming convetion. We are already using the `M` suffix for functions such as `anyM`. We used `anyM` because `many` is a valid English word. cc @kha @dselsam
160 lines
6.3 KiB
Text
160 lines
6.3 KiB
Text
/-
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Copyright (c) 2019 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Leonardo de Moura
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-/
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prelude
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import Init.Lean.Compiler.IR.CompilerM
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namespace Lean
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namespace IR
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namespace Checker
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structure CheckerContext :=
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(env : Environment) (localCtx : LocalContext := {}) (decls : Array Decl)
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structure CheckerState :=
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(foundVars : IndexSet := {})
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abbrev M := ReaderT CheckerContext (ExceptT String (StateT CheckerState Id))
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def markIndex (i : Index) : M Unit :=
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do s ← get;
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when (s.foundVars.contains i) $ throw ("variable / joinpoint index " ++ toString i ++ " has already been used");
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modify $ fun s => { foundVars := s.foundVars.insert i, .. s }
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def markVar (x : VarId) : M Unit :=
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markIndex x.idx
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def markJP (j : JoinPointId) : M Unit :=
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markIndex j.idx
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def getDecl (c : Name) : M Decl :=
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do ctx ← read;
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match findEnvDecl' ctx.env c ctx.decls with
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| none => throw ("unknown declaration '" ++ toString c ++ "'")
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| some d => pure d
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def checkVar (x : VarId) : M Unit :=
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do ctx ← read;
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unless (ctx.localCtx.isLocalVar x.idx || ctx.localCtx.isParam x.idx) $ throw ("unknown variable '" ++ toString x ++ "'")
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def checkJP (j : JoinPointId) : M Unit :=
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do ctx ← read;
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unless (ctx.localCtx.isJP j.idx) $ throw ("unknown join point '" ++ toString j ++ "'")
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def checkArg (a : Arg) : M Unit :=
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match a with
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| Arg.var x => checkVar x
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| other => pure ()
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def checkArgs (as : Array Arg) : M Unit :=
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as.forM checkArg
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@[inline] def checkEqTypes (ty₁ ty₂ : IRType) : M Unit :=
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unless (ty₁ == ty₂) $ throw ("unexpected type")
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@[inline] def checkType (ty : IRType) (p : IRType → Bool) : M Unit :=
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unless (p ty) $ throw ("unexpected type")
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def checkObjType (ty : IRType) : M Unit := checkType ty IRType.isObj
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def checkScalarType (ty : IRType) : M Unit := checkType ty IRType.isScalar
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def getType (x : VarId) : M IRType :=
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do ctx ← read;
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match ctx.localCtx.getType x with
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| some ty => pure ty
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| none => throw ("unknown variable '" ++ toString x ++ "'")
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@[inline] def checkVarType (x : VarId) (p : IRType → Bool) : M Unit :=
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do ty ← getType x; checkType ty p
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def checkObjVar (x : VarId) : M Unit :=
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checkVarType x IRType.isObj
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def checkScalarVar (x : VarId) : M Unit :=
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checkVarType x IRType.isScalar
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def checkFullApp (c : FunId) (ys : Array Arg) : M Unit :=
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do decl ← getDecl c;
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unless (ys.size == decl.params.size) (throw ("incorrect number of arguments to '" ++ toString c ++ "', " ++ toString ys.size ++ " provided, " ++ toString decl.params.size ++ " expected"));
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checkArgs ys
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def checkPartialApp (c : FunId) (ys : Array Arg) : M Unit :=
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do decl ← getDecl c;
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unless (ys.size < decl.params.size) (throw ("too many arguments too partial application '" ++ toString c ++ "', num. args: " ++ toString ys.size ++ ", arity: " ++ toString decl.params.size));
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checkArgs ys
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def checkExpr (ty : IRType) : Expr → M Unit
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| Expr.pap f ys => checkPartialApp f ys *> checkObjType ty -- partial applications should always produce a closure object
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| Expr.ap x ys => checkObjVar x *> checkArgs ys
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| Expr.fap f ys => checkFullApp f ys
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| Expr.ctor c ys => when (!ty.isStruct && !ty.isUnion && c.isRef) (checkObjType ty) *> checkArgs ys
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| Expr.reset _ x => checkObjVar x *> checkObjType ty
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| Expr.reuse x i u ys => checkObjVar x *> checkArgs ys *> checkObjType ty
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| Expr.box xty x => checkObjType ty *> checkScalarVar x *> checkVarType x (fun t => t == xty)
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| Expr.unbox x => checkScalarType ty *> checkObjVar x
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| Expr.proj i x => do xType ← getType x;
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match xType with
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| IRType.object => checkObjType ty
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| IRType.tobject => checkObjType ty
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| IRType.struct _ tys => if h : i < tys.size then checkEqTypes (tys.get ⟨i,h⟩) ty else throw "invalid proj index"
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| IRType.union _ tys => if h : i < tys.size then checkEqTypes (tys.get ⟨i,h⟩) ty else throw "invalid proj index"
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| other => throw "unexpected type"
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| Expr.uproj _ x => checkObjVar x *> checkType ty (fun t => t == IRType.usize)
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| Expr.sproj _ _ x => checkObjVar x *> checkScalarType ty
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| Expr.isShared x => checkObjVar x *> checkType ty (fun t => t == IRType.uint8)
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| Expr.isTaggedPtr x => checkObjVar x *> checkType ty (fun t => t == IRType.uint8)
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| Expr.lit (LitVal.str _) => checkObjType ty
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| Expr.lit _ => pure ()
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@[inline] def withParams (ps : Array Param) (k : M Unit) : M Unit :=
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do ctx ← read;
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localCtx ← ps.foldlM (fun (ctx : LocalContext) p => do
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markVar p.x;
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pure $ ctx.addParam p) ctx.localCtx;
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adaptReader (fun _ => { localCtx := localCtx, .. ctx }) k
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partial def checkFnBody : FnBody → M Unit
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| FnBody.vdecl x t v b => do
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checkExpr t v;
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markVar x;
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ctx ← read;
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adaptReader (fun (ctx : CheckerContext) => { localCtx := ctx.localCtx.addLocal x t v, .. ctx }) (checkFnBody b)
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| FnBody.jdecl j ys v b => do
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markJP j;
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withParams ys (checkFnBody v);
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ctx ← read;
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adaptReader (fun (ctx : CheckerContext) => { localCtx := ctx.localCtx.addJP j ys v, .. ctx }) (checkFnBody b)
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| FnBody.set x _ y b => checkVar x *> checkArg y *> checkFnBody b
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| FnBody.uset x _ y b => checkVar x *> checkVar y *> checkFnBody b
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| FnBody.sset x _ _ y _ b => checkVar x *> checkVar y *> checkFnBody b
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| FnBody.setTag x _ b => checkVar x *> checkFnBody b
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| FnBody.inc x _ _ _ b => checkVar x *> checkFnBody b
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| FnBody.dec x _ _ _ b => checkVar x *> checkFnBody b
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| FnBody.del x b => checkVar x *> checkFnBody b
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| FnBody.mdata _ b => checkFnBody b
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| FnBody.jmp j ys => checkJP j *> checkArgs ys
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| FnBody.ret x => checkArg x
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| FnBody.case _ x _ alts => checkVar x *> alts.forM (fun alt => checkFnBody alt.body)
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| FnBody.unreachable => pure ()
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def checkDecl : Decl → M Unit
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| Decl.fdecl f xs t b => withParams xs (checkFnBody b)
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| Decl.extern f xs t _ => withParams xs (pure ())
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end Checker
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def checkDecl (decls : Array Decl) (decl : Decl) : CompilerM Unit :=
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do env ← getEnv;
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match (Checker.checkDecl decl { env := env, decls := decls }).run' {} with
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| Except.error msg => throw ("IR check failed at '" ++ toString decl.name ++ "', error: " ++ msg)
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| other => pure ()
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def checkDecls (decls : Array Decl) : CompilerM Unit :=
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decls.forM (checkDecl decls)
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end IR
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end Lean
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