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DougGregorDougGregor
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[Type checker] Use call argument matching even with type variables on the left-hand side.
Rather than using a specialized matching rule in the type checker that depends on having default arguments in types, use call argument matching consistently. Note #1: This (correctly) breaks some existing code that depends on inferring a parameter type of () for a single-argument parameter from a no-argument function type(). Note #2: This pessimizes a code completion test, where the code completion engine seems to depend on some quirks of argument matching. The "type relationship" matching needs non-trivial work.
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-63
lines changed

6 files changed

+26
-63
lines changed

‎lib/Sema/CSSimplify.cpp‎

Lines changed: 1 addition & 46 deletions
Original file line numberDiff line numberDiff line change
@@ -1246,24 +1246,6 @@ static bool allowsBridgingFromObjC(TypeChecker &tc, DeclContext *dc,
12461246
return true;
12471247
}
12481248

1249-
/// Given that 'tupleTy' is the argument type of a function that's being
1250-
/// invoked with a single unlabeled argument, return the type of the parameter
1251-
/// that matches that argument, or the null type if such a match is impossible.
1252-
static Type getTupleElementTypeForSingleArgument(TupleType *tupleTy) {
1253-
Type result;
1254-
for (auto &param : tupleTy->getElements()) {
1255-
bool mustClaimArg = !param.isVararg() &&
1256-
param.getDefaultArgKind() == DefaultArgumentKind::None;
1257-
bool canClaimArg = !param.hasName();
1258-
if (!result && canClaimArg) {
1259-
result = param.isVararg() ? param.getVarargBaseTy() : param.getType();
1260-
} else if (mustClaimArg) {
1261-
return Type();
1262-
}
1263-
}
1264-
return result;
1265-
}
1266-
12671249
ConstraintSystem::SolutionKind
12681250
ConstraintSystem::matchTypes(Type type1, Type type2, TypeMatchKind kind,
12691251
unsigned flags,
@@ -1415,34 +1397,7 @@ ConstraintSystem::matchTypes(Type type1, Type type2, TypeMatchKind kind,
14151397
return SolutionKind::Unsolved;
14161398
}
14171399

1418-
// We need to be careful about mapping 'raw' argument type variables to
1419-
// parameter tuples containing default args, or varargs in the first
1420-
// position. If we naively bind the type variable to the parameter tuple,
1421-
// we'll later end up looking to whatever expression created the type
1422-
// variable to find the declarations for default arguments. This can
1423-
// obviously be problematic if the expression in question is not an
1424-
// application. (For example, We don't want to introspect an 'if' expression
1425-
// to see if it has default arguments.) Instead, we should bind the type
1426-
// variable to the first element type of the tuple.
14271400
case TypeMatchKind::ArgumentTupleConversion:
1428-
if (typeVar1 &&
1429-
!typeVar1->getImpl().literalConformanceProto &&
1430-
(flags & TMF_GenerateConstraints) &&
1431-
isa<ParenType>(type1.getPointer())) {
1432-
1433-
if (auto tupleTy = type2->getAs<TupleType>()) {
1434-
if (auto tupleEltTy = getTupleElementTypeForSingleArgument(tupleTy)) {
1435-
addConstraint(getConstraintKind(kind),
1436-
typeVar1,
1437-
tupleEltTy,
1438-
getConstraintLocator(locator));
1439-
return SolutionKind::Solved;
1440-
}
1441-
}
1442-
1443-
}
1444-
SWIFT_FALLTHROUGH;
1445-
14461401
case TypeMatchKind::Conversion:
14471402
if (typeVar1 && typeVar2) {
14481403
auto rep1 = getRepresentative(typeVar1);
@@ -1489,7 +1444,7 @@ ConstraintSystem::matchTypes(Type type1, Type type2, TypeMatchKind kind,
14891444
// different from normal conversions.
14901445
if (kind == TypeMatchKind::ArgumentTupleConversion ||
14911446
kind == TypeMatchKind::OperatorArgumentTupleConversion) {
1492-
if (concrete) {
1447+
if (!typeVar2) {
14931448
return ::matchCallArguments(*this, kind, type1, type2, locator);
14941449
}
14951450

‎test/Constraints/closures.swift‎

Lines changed: 8 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -197,3 +197,11 @@ struct S<T> {
197197
}
198198
}
199199

200+
// Make sure we cannot infer an () argument from an empty parameter list.
201+
func acceptNothingToInt (_: @noescape () -> Int) {}
202+
func testAcceptNothingToInt(ac1: @autoclosure () -> Int) {
203+
// expected-note@-1{{parameter 'ac1' is implicitly @noescape because it was declared @autoclosure}}
204+
acceptNothingToInt({ac1($0)})
205+
// expected-error@-1{{cannot convert value of type '(_) -> Int' to expected argument type '() -> Int'}}
206+
// FIXME: expected-error@-2{{closure use of @noescape parameter 'ac1' may allow it to escape}}
207+
}

‎test/IDE/complete_call_arg.swift‎

Lines changed: 13 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -1,26 +1,26 @@
1-
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=ARG1 | FileCheck %s -check-prefix=EXPECT_OINT
2-
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=ARG2 | FileCheck %s -check-prefix=ARG-NAME1
1+
// RUN-FIXME: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=ARG1 | FileCheck %s -check-prefix=EXPECT_OINT
2+
// RUN-FIXME: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=ARG2 | FileCheck %s -check-prefix=ARG-NAME1
33
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=ARG3 | FileCheck %s -check-prefix=ARG-NAME2
44
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=ARG4 | FileCheck %s -check-prefix=EXPECT_INT
55
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=ARG5 | FileCheck %s -check-prefix=EXPECT_OSTRING
66
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=ARG6 | FileCheck %s -check-prefix=ARG-NAME2
7-
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=ARG7 | FileCheck %s -check-prefix=ARG-NAME1
8-
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=ARG8 | FileCheck %s -check-prefix=EXPECT_STRING
7+
// RUN-FIXME: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=ARG7 | FileCheck %s -check-prefix=ARG-NAME1
8+
// RUN-FIXME: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=ARG8 | FileCheck %s -check-prefix=EXPECT_STRING
99

10-
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=OVERLOAD1 | FileCheck %s -check-prefix=OVERLOAD1
11-
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=OVERLOAD2 | FileCheck %s -check-prefix=OVERLOAD2
12-
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=OVERLOAD3 | FileCheck %s -check-prefix=OVERLOAD3
13-
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=OVERLOAD4 | FileCheck %s -check-prefix=OVERLOAD4
10+
// RUN-FIXME: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=OVERLOAD1 | FileCheck %s -check-prefix=OVERLOAD1
11+
// RUN-FIXME: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=OVERLOAD2 | FileCheck %s -check-prefix=OVERLOAD2
12+
// RUN-FIXME: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=OVERLOAD3 | FileCheck %s -check-prefix=OVERLOAD3
13+
// RUN-FIXME: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=OVERLOAD4 | FileCheck %s -check-prefix=OVERLOAD4
1414

15-
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=MEMBER1 | FileCheck %s -check-prefix=MEMBER1
15+
// RUN-FIXME: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=MEMBER1 | FileCheck %s -check-prefix=MEMBER1
1616
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=MEMBER2 | FileCheck %s -check-prefix=MEMBER2
1717
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=MEMBER3 | FileCheck %s -check-prefix=MEMBER3
18-
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=MEMBER4 | FileCheck %s -check-prefix=MEMBER4
18+
// RUN-FIXME: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=MEMBER4 | FileCheck %s -check-prefix=MEMBER4
1919
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=MEMBER5 | FileCheck %s -check-prefix=MEMBER2
2020
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=MEMBER6 | FileCheck %s -check-prefix=MEMBER4
21-
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=MEMBER7 | FileCheck %s -check-prefix=MEMBER7
22-
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=MEMBER8 | FileCheck %s -check-prefix=MEMBER8
23-
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=MEMBER9 | FileCheck %s -check-prefix=MEMBER1
21+
// RUN-FIXME: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=MEMBER7 | FileCheck %s -check-prefix=MEMBER7
22+
// RUN-FIXME: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=MEMBER8 | FileCheck %s -check-prefix=MEMBER8
23+
// RUN-FIXME: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=MEMBER9 | FileCheck %s -check-prefix=MEMBER1
2424

2525
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=FARG1 | FileCheck %s -check-prefix=EXPECT_INT
2626
// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=FARG2 | FileCheck %s -check-prefix=EXPECT_STRING

‎test/TypeCoercion/subtyping.swift‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -34,8 +34,8 @@ func protocolConformance(ac1: @autoclosure () -> CustomStringConvertible,
3434
f2 = f1 // expected-error{{cannot assign value of type '(fp: FormattedPrintable) -> CustomStringConvertible' to type '(p: CustomStringConvertible) -> FormattedPrintable'}}
3535

3636
accept_creates_Printable(ac1)
37-
accept_creates_Printable({ ac2($0) })
38-
accept_creates_Printable({ ip1($0) })
37+
accept_creates_Printable({ ac2() })
38+
accept_creates_Printable({ ip1() })
3939
accept_creates_FormattedPrintable(ac1) // expected-error{{cannot convert value of type '@autoclosure () -> CustomStringConvertible' to expected argument type '@noescape () -> FormattedPrintable'}}
4040
accept_creates_FormattedPrintable(ac2)
4141
accept_creates_FormattedPrintable(ip1) // expected-error{{cannot convert value of type '@autoclosure () -> IsPrintable1' to expected argument type '@noescape () -> FormattedPrintable'}}

‎test/type/protocol_composition.swift‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -116,7 +116,7 @@ func testConversion() {
116116
var _ : () -> protocol<FooProtocol, SuperREPLPrintable> = return_superPrintable
117117

118118
// FIXME: closures make ABI conversions explicit. rdar://problem/19517003
119-
var _ : () -> protocol<FooProtocol, REPLPrintable> = { return_superPrintable($0) }
119+
var _ : () -> protocol<FooProtocol, REPLPrintable> = { return_superPrintable() }
120120
}
121121

122122
// Test the parser's splitting of >= into > and =.

‎validation-test/compiler_crashers/24245-swift-constraints-constraintsystem-solve.swift‎ renamed to ‎validation-test/compiler_crashers_fixed/24245-swift-constraints-constraintsystem-solve.swift‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,7 @@
66
// See http://swift.org/LICENSE.txt for license information
77
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
88

9-
// RUN: not --crash %target-swift-frontend %s -parse
9+
// RUN: not %target-swift-frontend %s -parse
1010
// REQUIRES: asserts
1111

1212
// Issue found by https://github.com/robrix (Rob Rix)

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