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Diagnose missing casting intrinsics instead of crashing.

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This commit is contained in:
John McCall
2016-07-19 13:30:47 -07:00
parent 598690b594
commit c312c00377
5 changed files with 47 additions and 15 deletions
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23
lib/SILGen/SILGenDynamicCast.cpp
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@@ -302,28 +302,31 @@ static RValue emitCollectionDowncastExpr(SILGenFunction &SGF,
auto &ctx = SGF.getASTContext();
FuncDecl *fn = nullptr;
if (fromCollection->getDecl() == ctx.getArrayDecl()) {
fn = conditional ? ctx.getArrayConditionalCast(nullptr)
: ctx.getArrayForceCast(nullptr);
fn = conditional ? SGF.SGM.getArrayConditionalCast(loc)
: SGF.SGM.getArrayForceCast(loc);
} else if (fromCollection->getDecl() == ctx.getDictionaryDecl()) {
fn = bridgesFromObjC
? (conditional
? ctx.getDictionaryBridgeFromObjectiveCConditional(nullptr)
: ctx.getDictionaryBridgeFromObjectiveC(nullptr))
? SGF.SGM.getDictionaryBridgeFromObjectiveCConditional(loc)
: SGF.SGM.getDictionaryBridgeFromObjectiveC(loc))
: (conditional
? ctx.getDictionaryDownCastConditional(nullptr)
: ctx.getDictionaryDownCast(nullptr));
? SGF.SGM.getDictionaryDownCastConditional(loc)
: SGF.SGM.getDictionaryDownCast(loc));
} else if (fromCollection->getDecl() == ctx.getSetDecl()) {
fn = bridgesFromObjC
? (conditional
? ctx.getSetBridgeFromObjectiveCConditional(nullptr)
: ctx.getSetBridgeFromObjectiveC(nullptr))
? SGF.SGM.getSetBridgeFromObjectiveCConditional(loc)
: SGF.SGM.getSetBridgeFromObjectiveC(loc))
: (conditional
? ctx.getSetDownCastConditional(nullptr)
: ctx.getSetDownCast(nullptr));
? SGF.SGM.getSetDownCastConditional(loc)
: SGF.SGM.getSetDownCast(loc));
} else {
llvm_unreachable("unsupported collection upcast kind");
}
// This will have been diagnosed by the accessors above.
if (!fn) return SGF.emitUndefRValue(loc, destType);
auto fnArcheTypes = fn->getGenericParams()->getPrimaryArchetypes();
auto fromSubsts = fromCollection->gatherAllSubstitutions(
SGF.SGM.SwiftModule, nullptr);