/// Perform a foreign error check by testing whether the call result is zero.
/// The call result is otherwise ignored.
static void
emitResultIsZeroErrorCheck(SILGenFunction &gen, SILLocation loc,
ManagedValue result, ManagedValue errorSlot,
bool suppressErrorCheck, bool zeroIsError) {
// Just ignore the call result if we're suppressing the error check.
if (suppressErrorCheck) {
return;
}
SILValue resultValue =
emitUnwrapIntegerResult(gen, loc, result.getUnmanagedValue());
CanType resultType = resultValue->getType().getSwiftRValueType();
if (!resultType->isBuiltinIntegerType(1)) {
SILValue zero =
gen.B.createIntegerLiteral(loc, resultValue->getType(), 0);
ASTContext &ctx = gen.getASTContext();
resultValue =
gen.B.createBuiltinBinaryFunction(loc,
"cmp_ne",
resultValue->getType(),
SILType::getBuiltinIntegerType(1, ctx),
{resultValue, zero});
}
SILBasicBlock *errorBB = gen.createBasicBlock(FunctionSection::Postmatter);
SILBasicBlock *contBB = gen.createBasicBlock();
if (zeroIsError)
gen.B.createCondBranch(loc, resultValue, contBB, errorBB);
else
gen.B.createCondBranch(loc, resultValue, errorBB, contBB);
gen.emitForeignErrorBlock(loc, errorBB, errorSlot);
gen.B.emitBlock(contBB);
}
