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TypeCheckMacros.cpp
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//===--- TypeCheckMacros.cpp - Macro Handling ----------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file implements support for the evaluation of macros.
//
//===----------------------------------------------------------------------===//
#include "TypeCheckMacros.h"
#include "../AST/InlinableText.h"
#include "TypeCheckType.h"
#include "TypeChecker.h"
#include "swift/ABI/MetadataValues.h"
#include "swift/AST/ASTBridging.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/ASTMangler.h"
#include "swift/AST/ASTNode.h"
#include "swift/AST/DiagnosticsFrontend.h"
#include "swift/AST/Expr.h"
#include "swift/AST/FreestandingMacroExpansion.h"
#include "swift/AST/MacroDefinition.h"
#include "swift/AST/NameLookupRequests.h"
#include "swift/AST/PluginLoader.h"
#include "swift/AST/PluginRegistry.h"
#include "swift/AST/PrettyStackTrace.h"
#include "swift/AST/SourceFile.h"
#include "swift/AST/TypeCheckRequests.h"
#include "swift/Basic/Defer.h"
#include "swift/Basic/Lazy.h"
#include "swift/Basic/SourceManager.h"
#include "swift/Basic/StringExtras.h"
#include "swift/Bridging/ASTGen.h"
#include "swift/Demangling/Demangler.h"
#include "swift/Demangling/ManglingMacros.h"
#include "swift/Parse/Lexer.h"
#include "swift/Sema/IDETypeChecking.h"
#include "swift/Subsystems.h"
#include "llvm/Config/config.h"
using namespace swift;
#if SWIFT_BUILD_SWIFT_SYNTAX
/// Look for macro's type metadata given its external module and type name.
static void const *
lookupMacroTypeMetadataByExternalName(ASTContext &ctx, StringRef moduleName,
StringRef typeName,
LoadedLibraryPlugin *plugin) {
// Look up the type metadata accessor as a struct, enum, or class.
const Demangle::Node::Kind typeKinds[] = {
Demangle::Node::Kind::Structure,
Demangle::Node::Kind::Enum,
Demangle::Node::Kind::Class
};
void *accessorAddr = nullptr;
for (auto typeKind : typeKinds) {
auto symbolName = Demangle::mangledNameForTypeMetadataAccessor(
moduleName, typeName, typeKind);
accessorAddr = plugin->getAddressOfSymbol(symbolName.c_str());
if (accessorAddr)
break;
}
if (!accessorAddr)
return nullptr;
// Call the accessor to form type metadata.
using MetadataAccessFunc = const void *(MetadataRequest);
auto accessor = reinterpret_cast<MetadataAccessFunc*>(accessorAddr);
return accessor(MetadataRequest(MetadataState::Complete));
}
#endif
/// Translate an argument provided as a string literal into an identifier,
/// or return \c None and emit an error if it cannot be done.
llvm::Optional<Identifier> getIdentifierFromStringLiteralArgument(
ASTContext &ctx, MacroExpansionExpr *expansion, unsigned index) {
auto argList = expansion->getArgs();
// If there's no argument here, an error was diagnosed elsewhere.
if (!argList || index >= argList->size()) {
return llvm::None;
}
auto arg = argList->getExpr(index);
auto stringLiteral = dyn_cast<StringLiteralExpr>(arg);
if (!stringLiteral) {
ctx.Diags.diagnose(
arg->getLoc(), diag::external_macro_arg_not_type_name, index
);
return llvm::None;
}
auto contents = stringLiteral->getValue();
if (!Lexer::isIdentifier(contents)) {
ctx.Diags.diagnose(
arg->getLoc(), diag::external_macro_arg_not_type_name, index
);
return llvm::None;
}
return ctx.getIdentifier(contents);
}
/// For a macro expansion expression that is known to be #externalMacro,
/// handle the definition.
#if SWIFT_BUILD_SWIFT_SYNTAX
static MacroDefinition handleExternalMacroDefinition(
ASTContext &ctx, MacroExpansionExpr *expansion) {
// Dig out the module and type name.
auto moduleName = getIdentifierFromStringLiteralArgument(ctx, expansion, 0);
if (!moduleName) {
return MacroDefinition::forInvalid();
}
auto typeName = getIdentifierFromStringLiteralArgument(ctx, expansion, 1);
if (!typeName) {
return MacroDefinition::forInvalid();
}
return MacroDefinition::forExternal(*moduleName, *typeName);
}
#endif // SWIFT_BUILD_SWIFT_SYNTAX
MacroDefinition MacroDefinitionRequest::evaluate(
Evaluator &evaluator, MacroDecl *macro
) const {
// If no definition was provided, the macro is... undefined, of course.
auto definition = macro->definition;
if (!definition)
return MacroDefinition::forUndefined();
#if SWIFT_BUILD_SWIFT_SYNTAX
ASTContext &ctx = macro->getASTContext();
auto sourceFile = macro->getParentSourceFile();
BridgedStringRef externalMacroName{nullptr, 0};
ptrdiff_t *replacements = nullptr;
ptrdiff_t numReplacements = 0;
auto checkResult = swift_ASTGen_checkMacroDefinition(
&ctx.Diags, sourceFile->getExportedSourceFile(),
macro->getLoc().getOpaquePointerValue(), &externalMacroName,
&replacements, &numReplacements);
// Clean up after the call.
SWIFT_DEFER {
swift_ASTGen_freeBridgedString(externalMacroName);
swift_ASTGen_freeExpansionReplacements(replacements, numReplacements);
};
if (checkResult < 0 && ctx.CompletionCallback) {
// If the macro failed to check and we are in code completion mode, pretend
// it's an arbitrary macro. This allows us to get call argument completions
// inside `#externalMacro`.
checkResult = BridgedMacroDefinitionKind::BridgedExpandedMacro;
}
if (checkResult < 0)
return MacroDefinition::forInvalid();
switch (static_cast<BridgedMacroDefinitionKind>(checkResult)) {
case BridgedExpandedMacro:
// Handle expanded macros below.
break;
case BridgedExternalMacro: {
// An external macro described as ModuleName.TypeName. Get both identifiers.
assert(!replacements && "External macro doesn't have replacements");
StringRef externalMacroStr = externalMacroName.unbridged();
StringRef externalModuleName, externalTypeName;
std::tie(externalModuleName, externalTypeName) = externalMacroStr.split('.');
Identifier moduleName = ctx.getIdentifier(externalModuleName);
Identifier typeName = ctx.getIdentifier(externalTypeName);
return MacroDefinition::forExternal(moduleName, typeName);
}
case BridgedBuiltinExternalMacro:
return MacroDefinition::forBuiltin(BuiltinMacroKind::ExternalMacro);
}
// Type-check the macro expansion.
Type resultType = macro->mapTypeIntoContext(macro->getResultInterfaceType());
constraints::ContextualTypeInfo contextualType {
TypeLoc::withoutLoc(resultType),
// FIXME: Add a contextual type purpose for macro definition checking.
ContextualTypePurpose::CTP_CoerceOperand
};
PrettyStackTraceDecl debugStack("type checking macro definition", macro);
Type typeCheckedType = TypeChecker::typeCheckExpression(
definition, macro, contextualType,
TypeCheckExprFlags::DisableMacroExpansions);
if (!typeCheckedType)
return MacroDefinition::forInvalid();
// Dig out the macro that was expanded.
auto expansion = cast<MacroExpansionExpr>(definition);
auto expandedMacro =
dyn_cast_or_null<MacroDecl>(expansion->getMacroRef().getDecl());
if (!expandedMacro)
return MacroDefinition::forInvalid();
// Handle external macros after type-checking.
auto builtinKind = expandedMacro->getBuiltinKind();
if (builtinKind == BuiltinMacroKind::ExternalMacro)
return handleExternalMacroDefinition(ctx, expansion);
// Expansion string text.
StringRef expansionText = externalMacroName.unbridged();
// Copy over the replacements.
SmallVector<ExpandedMacroReplacement, 2> replacementsVec;
for (unsigned i: range(0, numReplacements)) {
replacementsVec.push_back(
{ static_cast<unsigned>(replacements[3*i]),
static_cast<unsigned>(replacements[3*i+1]),
static_cast<unsigned>(replacements[3*i+2])});
}
return MacroDefinition::forExpanded(ctx, expansionText, replacementsVec);
#else
macro->diagnose(diag::macro_unsupported);
return MacroDefinition::forInvalid();
#endif
}
static llvm::Expected<LoadedExecutablePlugin *>
initializeExecutablePlugin(ASTContext &ctx,
LoadedExecutablePlugin *executablePlugin,
StringRef libraryPath, Identifier moduleName) {
// Lock the plugin while initializing.
// Note that'executablePlugn' can be shared between multiple ASTContext.
executablePlugin->lock();
SWIFT_DEFER { executablePlugin->unlock(); };
// FIXME: Ideally this should be done right after invoking the plugin.
// But plugin loading is in libAST and it can't link ASTGen symbols.
if (!executablePlugin->isInitialized()) {
#if SWIFT_BUILD_SWIFT_SYNTAX
if (!swift_ASTGen_initializePlugin(executablePlugin, &ctx.Diags)) {
return llvm::createStringError(
llvm::inconvertibleErrorCode(), "'%s' produced malformed response",
executablePlugin->getExecutablePath().data());
}
// Resend the compiler capability on reconnect.
auto *callback = new std::function<void(void)>(
[executablePlugin]() {
(void)swift_ASTGen_initializePlugin(
executablePlugin, /*diags=*/nullptr);
});
executablePlugin->addOnReconnect(callback);
executablePlugin->setCleanup([executablePlugin] {
swift_ASTGen_deinitializePlugin(executablePlugin);
});
#endif
}
// If this is a plugin server, load the library.
if (!libraryPath.empty()) {
#if SWIFT_BUILD_SWIFT_SYNTAX
llvm::SmallString<128> resolvedLibraryPath;
auto fs = ctx.SourceMgr.getFileSystem();
if (auto err = fs->getRealPath(libraryPath, resolvedLibraryPath)) {
return llvm::createStringError(err, err.message());
}
std::string resolvedLibraryPathStr(resolvedLibraryPath);
std::string moduleNameStr(moduleName.str());
BridgedStringRef bridgedErrorOut{nullptr, 0};
bool loaded = swift_ASTGen_pluginServerLoadLibraryPlugin(
executablePlugin, resolvedLibraryPathStr.c_str(), moduleNameStr.c_str(),
&bridgedErrorOut);
auto errorOut = bridgedErrorOut.unbridged();
if (!loaded) {
SWIFT_DEFER { swift_ASTGen_freeBridgedString(errorOut); };
return llvm::createStringError(
llvm::inconvertibleErrorCode(),
"failed to load library plugin '%s' in plugin server '%s'; %s",
resolvedLibraryPathStr.c_str(),
executablePlugin->getExecutablePath().data(), errorOut.data());
}
assert(errorOut.data() == nullptr);
// Set a callback to load the library again on reconnections.
auto *callback = new std::function<void(void)>(
[executablePlugin, resolvedLibraryPathStr, moduleNameStr]() {
(void)swift_ASTGen_pluginServerLoadLibraryPlugin(
executablePlugin, resolvedLibraryPathStr.c_str(),
moduleNameStr.c_str(),
/*errorOut=*/nullptr);
});
executablePlugin->addOnReconnect(callback);
// Remove the callback and deallocate it when this ASTContext is destructed.
ctx.addCleanup([executablePlugin, callback]() {
executablePlugin->removeOnReconnect(callback);
delete callback;
});
#endif
}
return executablePlugin;
}
CompilerPluginLoadResult
CompilerPluginLoadRequest::evaluate(Evaluator &evaluator, ASTContext *ctx,
Identifier moduleName) const {
PluginLoader &loader = ctx->getPluginLoader();
const auto &entry = loader.lookupPluginByModuleName(moduleName);
SmallString<0> errorMessage;
if (!entry.executablePath.empty()) {
llvm::Expected<LoadedExecutablePlugin *> executablePlugin =
loader.loadExecutablePlugin(entry.executablePath);
if (executablePlugin) {
if (ctx->LangOpts.EnableMacroLoadingRemarks) {
unsigned tag = entry.libraryPath.empty() ? 1 : 2;
ctx->Diags.diagnose(SourceLoc(), diag::macro_loaded, moduleName, tag,
entry.executablePath, entry.libraryPath);
}
executablePlugin = initializeExecutablePlugin(
*ctx, executablePlugin.get(), entry.libraryPath, moduleName);
}
if (executablePlugin)
return executablePlugin.get();
llvm::handleAllErrors(executablePlugin.takeError(),
[&](const llvm::ErrorInfoBase &err) {
if (!errorMessage.empty())
errorMessage += ", ";
errorMessage += err.message();
});
} else if (!entry.libraryPath.empty()) {
llvm::Expected<LoadedLibraryPlugin *> libraryPlugin =
loader.loadLibraryPlugin(entry.libraryPath);
if (libraryPlugin) {
if (ctx->LangOpts.EnableMacroLoadingRemarks) {
ctx->Diags.diagnose(SourceLoc(), diag::macro_loaded, moduleName, 0,
entry.libraryPath, StringRef());
}
return libraryPlugin.get();
} else {
llvm::handleAllErrors(libraryPlugin.takeError(),
[&](const llvm::ErrorInfoBase &err) {
if (!errorMessage.empty())
errorMessage += ", ";
errorMessage += err.message();
});
}
}
if (!errorMessage.empty()) {
NullTerminatedStringRef err(errorMessage, *ctx);
return CompilerPluginLoadResult::error(err);
} else {
NullTerminatedStringRef errMsg(
"plugin for module '" + moduleName.str() + "' not found", *ctx);
return CompilerPluginLoadResult::error(errMsg);
}
}
static ExternalMacroDefinition
resolveInProcessMacro(ASTContext &ctx, Identifier moduleName,
Identifier typeName, LoadedLibraryPlugin *plugin) {
#if SWIFT_BUILD_SWIFT_SYNTAX
/// Look for the type metadata given the external module and type names.
auto macroMetatype = lookupMacroTypeMetadataByExternalName(
ctx, moduleName.str(), typeName.str(), plugin);
if (macroMetatype) {
// Check whether the macro metatype is in-process.
if (auto inProcess = swift_ASTGen_resolveMacroType(macroMetatype)) {
// Make sure we clean up after the macro.
ctx.addCleanup([inProcess]() {
swift_ASTGen_destroyMacro(inProcess);
});
return ExternalMacroDefinition{
ExternalMacroDefinition::PluginKind::InProcess, inProcess};
} else {
NullTerminatedStringRef err(
"'" + moduleName.str() + "." + typeName.str() +
"' is not a valid macro implementation type in library plugin '" +
StringRef(plugin->getLibraryPath()) + "'",
ctx);
return ExternalMacroDefinition::error(err);
}
}
NullTerminatedStringRef err("'" + moduleName.str() + "." + typeName.str() +
"' could not be found in library plugin '" +
StringRef(plugin->getLibraryPath()) + "'",
ctx);
return ExternalMacroDefinition::error(err);
#endif
return ExternalMacroDefinition::error(
"the current compiler was not built with macro support");
}
static ExternalMacroDefinition
resolveExecutableMacro(ASTContext &ctx,
LoadedExecutablePlugin *executablePlugin,
Identifier moduleName, Identifier typeName) {
#if SWIFT_BUILD_SWIFT_SYNTAX
if (auto *execMacro = swift_ASTGen_resolveExecutableMacro(
moduleName.get(), typeName.get(), executablePlugin)) {
// Make sure we clean up after the macro.
ctx.addCleanup(
[execMacro]() { swift_ASTGen_destroyExecutableMacro(execMacro); });
return ExternalMacroDefinition{
ExternalMacroDefinition::PluginKind::Executable, execMacro};
}
// NOTE: this is not reachable because executable macro resolution always
// succeeds.
NullTerminatedStringRef err(
"'" + moduleName.str() + "." + typeName.str() +
"' could not be found in executable plugin" +
StringRef(executablePlugin->getExecutablePath()),
ctx);
return ExternalMacroDefinition::error(err);
#endif
return ExternalMacroDefinition::error(
"the current compiler was not built with macro support");
}
ExternalMacroDefinition
ExternalMacroDefinitionRequest::evaluate(Evaluator &evaluator, ASTContext *ctx,
Identifier moduleName,
Identifier typeName) const {
// Try to load a plugin module from the plugin search paths. If it
// succeeds, resolve in-process from that plugin
CompilerPluginLoadRequest loadRequest{ctx, moduleName};
CompilerPluginLoadResult loaded = evaluateOrDefault(
evaluator, loadRequest, CompilerPluginLoadResult::error("request error"));
if (auto loadedLibrary = loaded.getAsLibraryPlugin()) {
return resolveInProcessMacro(*ctx, moduleName, typeName, loadedLibrary);
}
if (auto *executablePlugin = loaded.getAsExecutablePlugin()) {
return resolveExecutableMacro(*ctx, executablePlugin, moduleName, typeName);
}
return ExternalMacroDefinition::error(loaded.getErrorMessage());
}
/// Adjust the given mangled name for a macro expansion to produce a valid
/// buffer name.
static std::string adjustMacroExpansionBufferName(StringRef name) {
if (name.empty()) {
return "<macro-expansion>";
}
std::string result;
if (name.startswith(MANGLING_PREFIX_STR)) {
result += MACRO_EXPANSION_BUFFER_MANGLING_PREFIX;
name = name.drop_front(StringRef(MANGLING_PREFIX_STR).size());
}
result += name;
result += ".swift";
return result;
}
llvm::Optional<unsigned>
ExpandMacroExpansionExprRequest::evaluate(Evaluator &evaluator,
MacroExpansionExpr *mee) const {
ConcreteDeclRef macroRef = mee->getMacroRef();
assert(macroRef && isa<MacroDecl>(macroRef.getDecl()) &&
"MacroRef should be set before expansion");
auto *macro = cast<MacroDecl>(macroRef.getDecl());
if (macro->getMacroRoles().contains(MacroRole::Expression)) {
return expandMacroExpr(mee);
}
// For a non-expression macro, expand it as a declaration.
else if (macro->getMacroRoles().contains(MacroRole::Declaration) ||
macro->getMacroRoles().contains(MacroRole::CodeItem)) {
if (!mee->getSubstituteDecl()) {
(void)mee->createSubstituteDecl();
}
// Return the expanded buffer ID.
return evaluateOrDefault(
evaluator, ExpandMacroExpansionDeclRequest(mee->getSubstituteDecl()),
llvm::None);
}
// Other macro roles may also be encountered here, as they use
// `MacroExpansionExpr` for resolution. In those cases, do not expand.
return llvm::None;
}
ArrayRef<unsigned> ExpandMemberAttributeMacros::evaluate(Evaluator &evaluator,
Decl *decl) const {
if (decl->isImplicit())
return { };
// Member attribute macros do not apply to macro-expanded members.
if (decl->isInMacroExpansionInContext())
return { };
auto *parentDecl = decl->getDeclContext()->getAsDecl();
if (!parentDecl || !isa<IterableDeclContext>(parentDecl))
return { };
if (isa<PatternBindingDecl>(decl))
return { };
SmallVector<unsigned, 2> bufferIDs;
parentDecl->forEachAttachedMacro(MacroRole::MemberAttribute,
[&](CustomAttr *attr, MacroDecl *macro) {
if (auto bufferID = expandAttributes(attr, macro, decl))
bufferIDs.push_back(*bufferID);
});
return parentDecl->getASTContext().AllocateCopy(bufferIDs);
}
ArrayRef<unsigned> ExpandSynthesizedMemberMacroRequest::evaluate(
Evaluator &evaluator, Decl *decl
) const {
SmallVector<unsigned, 2> bufferIDs;
decl->forEachAttachedMacro(MacroRole::Member,
[&](CustomAttr *attr, MacroDecl *macro) {
if (auto bufferID = expandMembers(attr, macro, decl))
bufferIDs.push_back(*bufferID);
});
return decl->getASTContext().AllocateCopy(bufferIDs);
}
ArrayRef<unsigned>
ExpandPeerMacroRequest::evaluate(Evaluator &evaluator, Decl *decl) const {
SmallVector<unsigned, 2> bufferIDs;
decl->forEachAttachedMacro(MacroRole::Peer,
[&](CustomAttr *attr, MacroDecl *macro) {
if (auto bufferID = expandPeers(attr, macro, decl))
bufferIDs.push_back(*bufferID);
});
return decl->getASTContext().AllocateCopy(bufferIDs);
}
static Identifier makeIdentifier(ASTContext &ctx, StringRef name) {
return ctx.getIdentifier(name);
}
static Identifier makeIdentifier(ASTContext &ctx, std::nullptr_t) {
return Identifier();
}
bool swift::isInvalidAttachedMacro(MacroRole role,
Decl *attachedTo) {
switch (role) {
#define FREESTANDING_MACRO_ROLE(Name, Description) case MacroRole::Name:
#define ATTACHED_MACRO_ROLE(Name, Description, MangledChar)
#include "swift/Basic/MacroRoles.def"
llvm_unreachable("Invalid macro role for attached macro");
case MacroRole::Accessor:
// Only var decls and subscripts have accessors.
if (isa<AbstractStorageDecl>(attachedTo) && !isa<ParamDecl>(attachedTo))
return false;
break;
case MacroRole::MemberAttribute:
case MacroRole::Member:
// Nominal types and extensions can have members.
if (isa<NominalTypeDecl>(attachedTo) || isa<ExtensionDecl>(attachedTo))
return false;
break;
case MacroRole::Peer:
// Peer macros are allowed on everything except parameters.
if (!isa<ParamDecl>(attachedTo))
return false;
break;
case MacroRole::Conformance:
case MacroRole::Extension:
// Only primary declarations of nominal types
if (isa<NominalTypeDecl>(attachedTo))
return false;
break;
case MacroRole::Preamble:
case MacroRole::Body:
// Only function declarations.
if (isa<AbstractFunctionDecl>(attachedTo))
return false;
break;
}
return true;
}
static void diagnoseInvalidDecl(Decl *decl,
MacroDecl *macro,
llvm::function_ref<bool(DeclName)> coversName) {
auto &ctx = decl->getASTContext();
// Diagnose invalid declaration kinds.
if (isa<ImportDecl>(decl) ||
isa<OperatorDecl>(decl) ||
isa<PrecedenceGroupDecl>(decl) ||
isa<MacroDecl>(decl) ||
isa<ExtensionDecl>(decl)) {
decl->diagnose(diag::invalid_decl_in_macro_expansion,
decl->getDescriptiveKind());
decl->setInvalid();
if (auto *extension = dyn_cast<ExtensionDecl>(decl)) {
extension->setExtendedNominal(nullptr);
}
return;
}
// Diagnose `@main` types.
if (auto *mainAttr = decl->getAttrs().getAttribute<MainTypeAttr>()) {
ctx.Diags.diagnose(mainAttr->getLocation(),
diag::invalid_main_type_in_macro_expansion);
mainAttr->setInvalid();
}
// Diagnose default literal type overrides.
if (auto *typeAlias = dyn_cast<TypeAliasDecl>(decl)) {
auto name = typeAlias->getBaseIdentifier();
#define EXPRESSIBLE_BY_LITERAL_PROTOCOL_WITH_NAME(_, __, typeName, \
supportsOverride) \
if (supportsOverride && name == makeIdentifier(ctx, typeName)) { \
typeAlias->diagnose(diag::literal_type_in_macro_expansion, \
makeIdentifier(ctx, typeName)); \
typeAlias->setInvalid(); \
return; \
}
#include "swift/AST/KnownProtocols.def"
#undef EXPRESSIBLE_BY_LITERAL_PROTOCOL_WITH_NAME
}
// Diagnose value decls with names not covered by the macro
if (auto *value = dyn_cast<ValueDecl>(decl)) {
auto name = value->getName();
// Unique names are always permitted.
if (MacroDecl::isUniqueMacroName(name.getBaseName().userFacingName()))
return;
if (coversName(name)) {
return;
}
value->diagnose(diag::invalid_macro_introduced_name,
name, macro->getBaseName());
}
}
/// Diagnose macro expansions that produce any of the following declarations:
/// - Import declarations
/// - Operator and precedence group declarations
/// - Macro declarations
/// - Extensions
/// - Types with `@main` attributes
/// - Top-level default literal type overrides
/// - Value decls with names not covered by the macro declaration.
static void validateMacroExpansion(SourceFile *expansionBuffer,
MacroDecl *macro,
ValueDecl *attachedTo,
MacroRole role) {
// Gather macro-introduced names
llvm::SmallVector<DeclName, 2> introducedNames;
macro->getIntroducedNames(role, attachedTo, introducedNames);
llvm::SmallDenseSet<DeclName, 2> introducedNameSet(
introducedNames.begin(), introducedNames.end());
auto coversName = [&](DeclName name) -> bool {
return (introducedNameSet.count(name) ||
introducedNameSet.count(name.getBaseName()) ||
introducedNameSet.count(MacroDecl::getArbitraryName()));
};
for (auto item : expansionBuffer->getTopLevelItems()) {
auto *decl = item.dyn_cast<Decl *>();
if (!decl) {
if (role != MacroRole::CodeItem &&
role != MacroRole::Preamble &&
role != MacroRole::Body) {
auto &ctx = expansionBuffer->getASTContext();
ctx.Diags.diagnose(item.getStartLoc(),
diag::expected_macro_expansion_decls);
}
continue;
}
// Certain macro roles can generate special declarations.
if ((isa<AccessorDecl>(decl) && role == MacroRole::Accessor) ||
(isa<ExtensionDecl>(decl) && role == MacroRole::Conformance)) {
continue;
}
if (role == MacroRole::Extension) {
auto *extension = dyn_cast<ExtensionDecl>(decl);
for (auto *member : extension->getMembers()) {
diagnoseInvalidDecl(member, macro, coversName);
}
continue;
}
diagnoseInvalidDecl(decl, macro, coversName);
}
}
/// Determine whether the given source file is from an expansion of the given
/// macro.
static bool isFromExpansionOfMacro(SourceFile *sourceFile, MacroDecl *macro,
MacroRole role) {
while (sourceFile) {
auto expansion = sourceFile->getMacroExpansion();
if (!expansion)
return false;
if (auto expansionExpr = dyn_cast_or_null<MacroExpansionExpr>(
expansion.dyn_cast<Expr *>())) {
if (expansionExpr->getMacroRef().getDecl() == macro)
return true;
} else if (auto expansionDecl = dyn_cast_or_null<MacroExpansionDecl>(
expansion.dyn_cast<Decl *>())) {
if (expansionDecl->getMacroRef().getDecl() == macro)
return true;
} else if (auto *macroAttr = sourceFile->getAttachedMacroAttribute()) {
auto *decl = expansion.dyn_cast<Decl *>();
auto *macroDecl = decl->getResolvedMacro(macroAttr);
if (!macroDecl)
return false;
return macroDecl == macro &&
sourceFile->getFulfilledMacroRole() == role;
} else {
llvm_unreachable("Unknown macro expansion node kind");
}
sourceFile = sourceFile->getEnclosingSourceFile();
}
return false;
}
/// Expand a macro definition.
static std::string expandMacroDefinition(
ExpandedMacroDefinition def, MacroDecl *macro, ArgumentList *args) {
ASTContext &ctx = macro->getASTContext();
std::string expandedResult;
StringRef originalText = def.getExpansionText();
unsigned startIdx = 0;
for (const auto replacement: def.getReplacements()) {
// Add the original text up to the first replacement.
expandedResult.append(
originalText.begin() + startIdx,
originalText.begin() + replacement.startOffset);
// Add the replacement text.
auto argExpr = args->getArgExprs()[replacement.parameterIndex];
SmallString<32> argTextBuffer;
auto argText = extractInlinableText(ctx.SourceMgr, argExpr, argTextBuffer);
expandedResult.append(argText);
// Update the starting position.
startIdx = replacement.endOffset;
}
// Add the remaining text.
expandedResult.append(
originalText.begin() + startIdx,
originalText.end());
return expandedResult;
}
static GeneratedSourceInfo::Kind getGeneratedSourceInfoKind(MacroRole role) {
switch (role) {
#define MACRO_ROLE(Name, Description) \
case MacroRole::Name: \
return GeneratedSourceInfo::Name##MacroExpansion;
#include "swift/Basic/MacroRoles.def"
}
}
// If this storage declaration is a variable with an explicit initializer,
// return the range from the `=` to the end of the explicit initializer.
static llvm::Optional<SourceRange>
getExplicitInitializerRange(AbstractStorageDecl *storage) {
auto var = dyn_cast<VarDecl>(storage);
if (!var)
return llvm::None;
auto pattern = var->getParentPatternBinding();
if (!pattern)
return llvm::None;
unsigned index = pattern->getPatternEntryIndexForVarDecl(var);
SourceLoc equalLoc = pattern->getEqualLoc(index);
SourceRange initRange = pattern->getOriginalInitRange(index);
if (equalLoc.isInvalid() || initRange.End.isInvalid())
return llvm::None;
return SourceRange(equalLoc, initRange.End);
}
static CharSourceRange getExpansionInsertionRange(MacroRole role,
ASTNode target,
SourceManager &sourceMgr) {
switch (role) {
case MacroRole::Accessor: {
auto storage = cast<AbstractStorageDecl>(target.get<Decl *>());
auto bracesRange = storage->getBracesRange();
// Compute the location where the accessors will be added.
if (bracesRange.Start.isValid()) {
// We have braces already, so insert them inside the leading '{'.
return CharSourceRange(
Lexer::getLocForEndOfToken(sourceMgr, bracesRange.Start), 0);
} else if (auto initRange = getExplicitInitializerRange(storage)) {
// The accessor had an initializer, so the initializer (including
// the `=`) is replaced by the accessors.
return Lexer::getCharSourceRangeFromSourceRange(sourceMgr, *initRange);
} else {
// The accessors go at the end.
SourceLoc endLoc = storage->getEndLoc();
if (auto var = dyn_cast<VarDecl>(storage)) {
if (auto pattern = var->getParentPattern())
endLoc = pattern->getEndLoc();
}
return CharSourceRange(Lexer::getLocForEndOfToken(sourceMgr, endLoc), 0);
}
}
case MacroRole::MemberAttribute: {
SourceLoc startLoc;
if (auto valueDecl = dyn_cast<ValueDecl>(target.get<Decl *>()))
startLoc = valueDecl->getAttributeInsertionLoc(/*forModifier=*/false);
else
startLoc = target.getStartLoc();
return CharSourceRange(startLoc, 0);
}
case MacroRole::Member: {
// Semantically, we insert members right before the closing brace.
SourceLoc rightBraceLoc;
if (auto nominal = dyn_cast<NominalTypeDecl>(target.get<Decl *>())) {
rightBraceLoc = nominal->getBraces().End;
} else {
auto ext = cast<ExtensionDecl>(target.get<Decl *>());
rightBraceLoc = ext->getBraces().End;
}
return CharSourceRange(rightBraceLoc, 0);
}
case MacroRole::Peer: {
SourceLoc endLoc = target.getEndLoc();
if (auto var = dyn_cast<VarDecl>(target.get<Decl *>())) {
if (auto binding = var->getParentPatternBinding())
endLoc = binding->getEndLoc();
}
SourceLoc afterDeclLoc = Lexer::getLocForEndOfToken(sourceMgr, endLoc);
return CharSourceRange(afterDeclLoc, 0);
break;
}
case MacroRole::Conformance: {
SourceLoc afterDeclLoc =
Lexer::getLocForEndOfToken(sourceMgr, target.getEndLoc());
return CharSourceRange(afterDeclLoc, 0);
}
case MacroRole::Extension: {
SourceLoc afterDeclLoc =
Lexer::getLocForEndOfToken(sourceMgr, target.getEndLoc());
return CharSourceRange(afterDeclLoc, 0);
}
case MacroRole::Preamble: {
SourceLoc inBodyLoc;
if (auto fn = dyn_cast<AbstractFunctionDecl>(target.get<Decl *>())) {
inBodyLoc = fn->getBodySourceRange().Start;
}
if (inBodyLoc.isInvalid())
inBodyLoc = target.getEndLoc();
return CharSourceRange(Lexer::getLocForEndOfToken(sourceMgr, inBodyLoc), 0);
}
case MacroRole::Body: {
SourceLoc afterDeclLoc =
Lexer::getLocForEndOfToken(sourceMgr, target.getEndLoc());
return CharSourceRange(afterDeclLoc, 0);
}
case MacroRole::Expression:
case MacroRole::Declaration:
case MacroRole::CodeItem:
return Lexer::getCharSourceRangeFromSourceRange(sourceMgr,
target.getSourceRange());
}
llvm_unreachable("unhandled MacroRole");
}
static SourceFile *
createMacroSourceFile(std::unique_ptr<llvm::MemoryBuffer> buffer,
MacroRole role, ASTNode target, DeclContext *dc,
CustomAttr *attr) {
ASTContext &ctx = dc->getASTContext();
SourceManager &sourceMgr = ctx.SourceMgr;
// Dump macro expansions to standard output, if requested.
if (ctx.LangOpts.DumpMacroExpansions) {
llvm::errs() << buffer->getBufferIdentifier()
<< "\n------------------------------\n"
<< buffer->getBuffer()
<< "\n------------------------------\n";
}
CharSourceRange generatedOriginalSourceRange =
getExpansionInsertionRange(role, target, sourceMgr);
GeneratedSourceInfo::Kind generatedSourceKind =
getGeneratedSourceInfoKind(role);
// Create a new source buffer with the contents of the expanded macro.
unsigned macroBufferID = sourceMgr.addNewSourceBuffer(std::move(buffer));
auto macroBufferRange = sourceMgr.getRangeForBuffer(macroBufferID);
GeneratedSourceInfo sourceInfo{generatedSourceKind,
generatedOriginalSourceRange,
macroBufferRange,
target.getOpaqueValue(),
dc,
attr};
sourceMgr.setGeneratedSourceInfo(macroBufferID, sourceInfo);
// Create a source file to hold the macro buffer. This is automatically
// registered with the enclosing module.
auto macroSourceFile = new (ctx) SourceFile(
*dc->getParentModule(), SourceFileKind::MacroExpansion, macroBufferID,
/*parsingOpts=*/{}, /*isPrimary=*/false);
macroSourceFile->setImports(dc->getParentSourceFile()->getImports());
return macroSourceFile;
}
#if SWIFT_BUILD_SWIFT_SYNTAX
static uint8_t getRawMacroRole(MacroRole role) {
switch (role) {
case MacroRole::Expression: return 0;
case MacroRole::Declaration: return 1;
case MacroRole::Accessor: return 2;
case MacroRole::MemberAttribute: return 3;
case MacroRole::Member: return 4;
case MacroRole::Peer: return 5;
case MacroRole::CodeItem: return 7;
// Use the same raw macro role for conformance and extension
// in ASTGen.
case MacroRole::Conformance:
case MacroRole::Extension: return 8;
case MacroRole::Preamble: return 9;
case MacroRole::Body: return 10;
}
}
#endif // SWIFT_BUILD_SWIFT_SYNTAX
/// Evaluate the given freestanding macro expansion.
static SourceFile *
evaluateFreestandingMacro(FreestandingMacroExpansion *expansion,
StringRef discriminatorStr = "") {
auto *dc = expansion->getDeclContext();