class compiler::CheckErrors

sys::Obj
  compiler::CompilerSupport
    compiler::CompilerStep
      compiler::CheckErrors

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CheckErrors walks the tree of statements and expressions looking for errors the compiler can detect such as invalid type usage. We attempt to leave all the error reporting to this step, so that we can batch report as many errors as possible.

Since CheckErrors already performs a full tree walk down to each leaf expression, we also do a couple of other AST decorations in this step:

1) add temp local for field assignments like return ++x
2) add temp local for returns inside protected region
3) check for field accessor optimization
4) check for field storage requirements
5) add implicit coersions: auto-casts, boxing, to non-nullable
6) implicit call to toImmutable when assigning to const field
7) mark ClosureExpr.setsConst

canCoerce

static Bool canCoerce(Expr expr, CType expected)

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Return if coerce would not report a compiler error.

checkFacet

Void checkFacet(FacetDef f)

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checkFacets

Void checkFacets(FacetDef[]? facets)

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checkPodDef

Void checkPodDef(PodDef pod)

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coerce

static Expr coerce(Expr expr, CType expected, |->Void| onErr)

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Coerce the target expression to the specified type. If the expression is not type compatible run the onErr function.

doCoerce

static Expr doCoerce(Expr expr, CType expected, |->Void| onErr)

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Coerce the target expression to the specified type. If the expression is not type compatible run the onErr function. Default Fantom behavior.

enterFinally

virtual override Void enterFinally(TryStmt stmt)

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enterStmt

virtual override Void enterStmt(Stmt stmt)

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exitFinally

virtual override Void exitFinally(TryStmt stmt)

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exitStmt

virtual override Void exitStmt(Stmt stmt)

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isFuncAutoCoerce

static Bool isFuncAutoCoerce(CType actualType, CType expectedType)

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isFuncAutoCoerceMatch

static Bool isFuncAutoCoerceMatch(CType actual, CType expected)

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isRestrictedName

static Bool isRestrictedName(Str name)

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isSlotVisible

static Bool isSlotVisible(TypeDef curType, CSlot slot)

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make

new make(Compiler compiler)

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needCoerce

static Bool needCoerce(CType from, CType to)

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run

virtual override Void run()

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visitExpr

virtual override Expr visitExpr(Expr expr)

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visitFieldDef

virtual override Void visitFieldDef(FieldDef f)

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visitMethodDef

virtual override Void visitMethodDef(MethodDef m)

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visitStmt

virtual override Stmt[]? visitStmt(Stmt stmt)

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visitTypeDef

virtual override Void visitTypeDef(TypeDef t)

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