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Merge pull request swiftlang#84871 from hnrklssn/inherit-literal-std
[ImportResolution] Only disallow explicit `std` imports (allow implicit)
2 parents f226f62 + a97da39 commit 87af553

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6 files changed

+125
-13
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6 files changed

+125
-13
lines changed

‎include/swift/AST/DiagnosticsSema.def‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -875,6 +875,8 @@ WARNING(sema_import_current_module_with_file,none,
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(StringRef, Identifier))
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ERROR(sema_opening_import,Fatal,
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"opening import file for module %0: %1", (Identifier, StringRef))
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NOTE(sema_module_aliased,none,
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"module name '%0' is aliased to '%1'", (StringRef, StringRef))
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REMARK(serialization_skipped_invalid_decl,none,
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"serialization skipped invalid %kind0",

‎lib/ClangImporter/ClangImporter.cpp‎

Lines changed: 1 addition & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -2418,10 +2418,6 @@ ModuleDecl *ClangImporter::Implementation::loadModule(
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ModuleDecl *MD = nullptr;
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ASTContext &ctx = getNameImporter().getContext();
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2421-
// `CxxStdlib` is the only accepted spelling of the C++ stdlib module name.
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if (path.front().Item.is("std") ||
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path.front().Item.str().starts_with("std_"))
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return nullptr;
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if (path.front().Item == ctx.Id_CxxStdlib) {
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ImportPath::Builder adjustedPath(ctx.getIdentifier("std"), importLoc);
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adjustedPath.append(path.getSubmodulePath());
@@ -9009,7 +9005,7 @@ bool importer::isCxxStdModule(StringRef moduleName, bool IsSystem) {
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ImportPath::Builder ClangImporter::Implementation::getSwiftModulePath(const clang::Module *M) {
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ImportPath::Builder builder;
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while (M) {
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if (!M->isSubModule() && isCxxStdModule(M))
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if (!M->isSubModule() && M->Name == "std")
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builder.push_back(SwiftContext.Id_CxxStdlib);
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else
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builder.push_back(SwiftContext.getIdentifier(M->Name));

‎lib/Sema/ImportResolution.cpp‎

Lines changed: 37 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -359,6 +359,26 @@ static bool isSubmodule(const ModuleDecl* M) {
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void ImportResolver::visitImportDecl(ImportDecl *ID) {
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assert(unboundImports.empty());
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// `CxxStdlib` is the only accepted spelling of the C++ stdlib module name.
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ImportPath::Builder builder;
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const ImportPath path = ID->getRealImportPath(builder);
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const llvm::StringRef front = path.front().Item.str();
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if (front == "std" || front.starts_with("std_")) {
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SmallString<64> modulePathStr;
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path.getString(modulePathStr);
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auto diagKind = ctx.LangOpts.DebuggerSupport ? diag::sema_no_import_repl
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: diag::sema_no_import;
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const SourceLoc importLoc = ID->getLoc();
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const ImportPath sourcePath = ID->getImportPath();
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const llvm::StringRef sourceFront = sourcePath.front().Item.str();
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ctx.Diags.diagnose(importLoc, diagKind, modulePathStr);
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ctx.Diags.diagnose(importLoc, diag::did_you_mean_cxxstdlib)
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.fixItReplaceChars(importLoc, importLoc.getAdvancedLoc(sourceFront.size()), "CxxStdlib");
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if (front != sourceFront)
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ctx.Diags.diagnose(importLoc, diag::sema_module_aliased, sourceFront, front);
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return;
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}
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unboundImports.emplace_back(ID);
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bindPendingImports();
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}
@@ -513,13 +533,15 @@ UnboundImport::getTopLevelModule(ModuleDecl *M, SourceFile &SF) {
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// MARK: Implicit imports
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//===----------------------------------------------------------------------===//
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516-
static void tryStdlibFixit(ASTContext &ctx,
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StringRef moduleName,
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SourceLoc loc) {
519-
if (moduleName.starts_with("std")) {
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ctx.Diags.diagnose(loc, diag::did_you_mean_cxxstdlib)
521-
.fixItReplaceChars(loc, loc.getAdvancedLoc(3), "CxxStdlib");
536+
ImportPath::Module getRealModulePath(ImportPath::Builder &builder, ImportPath::Module path, ASTContext &ctx) {
537+
for (size_t i = 0; i < path.size(); i++) {
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if (i == 0) {
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builder.push_back(ctx.getRealModuleName(path[i].Item));
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} else {
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builder.push_back(path[i]);
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}
522543
}
544+
return builder.get().getModulePath(false);
523545
}
524546

525547
static void diagnoseNoSuchModule(ModuleDecl *importingModule,
@@ -534,13 +556,20 @@ static void diagnoseNoSuchModule(ModuleDecl *importingModule,
534556
importingModule->getName());
535557
} else {
536558
SmallString<64> modulePathStr;
537-
modulePath.getString(modulePathStr);
559+
ImportPath::Builder builder;
560+
ImportPath::Module realModulePath = getRealModulePath(builder, modulePath, ctx);
561+
realModulePath.getString(modulePathStr);
538562

539563
auto diagKind = diag::sema_no_import;
540564
if (nonfatalInREPL && ctx.LangOpts.DebuggerSupport)
541565
diagKind = diag::sema_no_import_repl;
542566
ctx.Diags.diagnose(importLoc, diagKind, modulePathStr);
543-
tryStdlibFixit(ctx, modulePathStr, importLoc);
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568+
const llvm::StringRef sourceFront = modulePath.front().Item.str();
569+
const llvm::StringRef realFront = realModulePath.front().Item.str();
570+
if (realFront != sourceFront)
571+
ctx.Diags.diagnose(importLoc, diag::sema_module_aliased, sourceFront,
572+
realFront);
544573
}
545574

546575
if (ctx.SearchPathOpts.getSDKPath().empty() &&

‎test/ImportResolution/import-alias-fail.swift‎

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,5 @@
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// RUN: %target-typecheck-verify-swift -module-alias Foo=Bar
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import Foo // expected-error{{no such module 'Bar'}}
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// expected-note@-1{{module name 'Foo' is aliased to 'Bar'}}
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‎test/ImportResolution/import-std-fail.swift‎

Lines changed: 42 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,42 @@
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// RUN: %empty-directory(%t)
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// RUN: split-file %s %t
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// These errors are fatal, so test each one separately
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// RUN: %target-swift-frontend -typecheck -verify -cxx-interoperability-mode=default %t/a.swift
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// RUN: %target-swift-frontend -typecheck -verify -cxx-interoperability-mode=default %t/b.swift
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// RUN: %target-swift-frontend -typecheck -verify -cxx-interoperability-mode=default %t/c.swift
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// RUN: %target-swift-frontend -typecheck -verify -cxx-interoperability-mode=default %t/d.swift
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// RUN: %target-swift-frontend -typecheck -verify -cxx-interoperability-mode=default %t/e.swift -verify-additional-prefix aliased- -module-alias FooBar=std_foo_bar
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// RUN: %target-swift-frontend -typecheck -verify -cxx-interoperability-mode=default %t/e.swift -verify-additional-prefix unaliased-
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// RUN: %target-swift-frontend -typecheck -verify -cxx-interoperability-mode=default %t/f.swift -verify-additional-prefix aliased- -module-alias X=std_x_h
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// RUN: %target-swift-frontend -typecheck -verify -cxx-interoperability-mode=default %t/f.swift -verify-additional-prefix unaliased-
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//--- a.swift
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import std // expected-error{{no such module 'std'}}
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// expected-note@-1{{did you mean 'CxxStdlib'?}}{{8-11=CxxStdlib}} {{none}}
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//--- b.swift
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import std_ // expected-error{{no such module 'std_'}}
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// expected-note@-1{{did you mean 'CxxStdlib'?}}{{8-12=CxxStdlib}} {{none}}
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//--- c.swift
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import std_error_h // expected-error{{no such module 'std_error_h'}}
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// expected-note@-1{{did you mean 'CxxStdlib'?}}{{8-19=CxxStdlib}} {{none}}
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27+
//--- d.swift
28+
import std_core.math.abs // expected-error{{no such module 'std_core.math.abs'}}
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// expected-note@-1{{did you mean 'CxxStdlib'?}}{{8-16=CxxStdlib}} {{none}}
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//--- e.swift
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import FooBar // expected-aliased-error{{no such module 'std_foo_bar'}}
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// expected-aliased-note@-1{{did you mean 'CxxStdlib'?}}{{8-14=CxxStdlib}} {{none}}
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// expected-aliased-note@-2{{module name 'FooBar' is aliased to 'std_foo_bar'}} {{none}}
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// expected-unaliased-error@-3{{no such module 'FooBar'}}
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//--- f.swift
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import X
39+
// expected-aliased-error@-1{{no such module 'std_x_h'}}
40+
// expected-aliased-note@-2{{did you mean 'CxxStdlib'?}}{{8-9=CxxStdlib}} {{none}}
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// expected-aliased-note@-3{{module name 'X' is aliased to 'std_x_h'}} {{none}}
42+
// expected-unaliased-error@-4{{no such module 'X'}}

‎test/Interop/Cxx/swiftify-import/transitive-std-core-import.swift‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,38 @@
1+
// REQUIRES: swift_feature_SafeInteropWrappers
2+
// REQUIRES: OS=macosx
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4+
// Don't run this test with libc++ versions 17-19, when the top-level std module was split into multiple top-level modules.
5+
// RUN: %empty-directory(%t)
6+
// RUN: %target-clangxx %S/../stdlib/Inputs/check-libcxx-version.cpp -o %t/check-libcxx-version
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// RUN: %target-codesign %t/check-libcxx-version
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9+
// RUN: %target-run %t/check-libcxx-version || split-file %s %t
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// RUN: %target-run %t/check-libcxx-version || %target-swift-frontend -emit-module -plugin-path %swift-plugin-dir -o %t/Test.swiftmodule -I %t/Inputs -enable-experimental-feature SafeInteropWrappers -strict-memory-safety -warnings-as-errors -Xcc -Werror %t/test.swift -cxx-interoperability-mode=default -Xcc -std=c++20
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// Test that implicit imports can refer to std_core etc., even though Swift source code may not.
13+
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//--- Inputs/module.modulemap
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module TestClang {
16+
header "test.h"
17+
requires cplusplus
18+
export std_core.cstddef.size_t
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export span
20+
}
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//--- Inputs/test.h
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#include <__cstddef/size_t.h>
25+
#include <span>
26+
#include <lifetimebound.h>
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using FloatSpan = std::span<const float>;
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size_t foo(FloatSpan x __noescape);
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//--- test.swift
33+
import TestClang
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func test(x: Span<Float>) {
36+
let _ = foo(x)
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}
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