#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/SourceMgr.h"
+
+#include <map>
+
using namespace llvm;
#define DEBUG_TYPE "function-import"
return Result;
}
+namespace {
+/// Helper to load on demand a Module from file and cache it for subsequent
+/// queries. It can be used with the FunctionImporter.
+class ModuleLazyLoaderCache {
+ /// Cache of lazily loaded module for import.
+ StringMap<std::unique_ptr<Module>> ModuleMap;
+
+ /// Retrieve a Module from the cache or lazily load it on demand.
+ std::function<std::unique_ptr<Module>(StringRef FileName)> createLazyModule;
+
+public:
+ /// Create the loader, Module will be initialized in \p Context.
+ ModuleLazyLoaderCache(std::function<
+ std::unique_ptr<Module>(StringRef FileName)> createLazyModule)
+ : createLazyModule(createLazyModule) {}
+
+ /// Retrieve a Module from the cache or lazily load it on demand.
+ Module &operator()(StringRef FileName);
+};
+
+// Get a Module for \p FileName from the cache, or load it lazily.
+Module &ModuleLazyLoaderCache::operator()(StringRef Identifier) {
+ auto &Module = ModuleMap[Identifier];
+ if (!Module)
+ Module = createLazyModule(Identifier);
+ return *Module;
+}
+} // anonymous namespace
+
/// Walk through the instructions in \p F looking for external
/// calls not already in the \p CalledFunctions set. If any are
/// found they are added to the \p Worklist for importing.
-static void findExternalCalls(const Function &F, StringSet<> &CalledFunctions,
+static void findExternalCalls(const Module &DestModule, Function &F,
+ const FunctionInfoIndex &Index,
+ StringSet<> &CalledFunctions,
SmallVector<StringRef, 64> &Worklist) {
+ // We need to suffix internal function calls imported from other modules,
+ // prepare the suffix ahead of time.
+ StringRef Suffix;
+ if (F.getParent() != &DestModule)
+ Suffix =
+ (Twine(".llvm.") +
+ Twine(Index.getModuleId(F.getParent()->getModuleIdentifier()))).str();
+
for (auto &BB : F) {
for (auto &I : BB) {
if (isa<CallInst>(I)) {
auto CalledFunction = cast<CallInst>(I).getCalledFunction();
// Insert any new external calls that have not already been
// added to set/worklist.
- if (CalledFunction && CalledFunction->hasName() &&
- CalledFunction->isDeclaration() &&
- !CalledFunctions.count(CalledFunction->getName())) {
- CalledFunctions.insert(CalledFunction->getName());
- Worklist.push_back(CalledFunction->getName());
+ if (!CalledFunction || !CalledFunction->hasName())
+ continue;
+ // Ignore intrinsics early
+ if (CalledFunction->isIntrinsic()) {
+ assert(CalledFunction->getIntrinsicID() != 0);
+ continue;
+ }
+ auto ImportedName = CalledFunction->getName();
+ auto Renamed = (ImportedName + Suffix).str();
+ // Rename internal functions
+ if (CalledFunction->hasInternalLinkage()) {
+ ImportedName = Renamed;
+ }
+ auto It = CalledFunctions.insert(ImportedName);
+ if (!It.second) {
+ // This is a call to a function we already considered, skip.
+ continue;
}
+ // Ignore functions already present in the destination module
+ auto *SrcGV = DestModule.getNamedValue(ImportedName);
+ if (SrcGV) {
+ assert(isa<Function>(SrcGV) && "Name collision during import");
+ if (!cast<Function>(SrcGV)->isDeclaration()) {
+ DEBUG(dbgs() << DestModule.getModuleIdentifier() << "Ignoring "
+ << ImportedName << " already in DestinationModule\n");
+ continue;
+ }
+ }
+
+ Worklist.push_back(It.first->getKey());
+ DEBUG(dbgs() << DestModule.getModuleIdentifier()
+ << " Adding callee for : " << ImportedName << " : "
+ << F.getName() << "\n");
}
}
}
}
// Helper function: given a worklist and an index, will process all the worklist
-// and import them based on the summary information
-static unsigned ProcessImportWorklist(
+// and decide what to import based on the summary information.
+//
+// Nothing is actually imported, functions are materialized in their source
+// module and analyzed there.
+//
+// \p ModuleToFunctionsToImportMap is filled with the set of Function to import
+// per Module.
+static void GetImportList(
Module &DestModule, SmallVector<StringRef, 64> &Worklist,
- StringSet<> &CalledFunctions, Linker &TheLinker,
- const FunctionInfoIndex &Index,
- std::function<std::unique_ptr<Module>(StringRef FileName)> &
- LazyModuleLoader) {
- unsigned ImportCount = 0;
+ StringSet<> &CalledFunctions,
+ std::map<StringRef, std::pair<Module *, DenseSet<const GlobalValue *>>> &
+ ModuleToFunctionsToImportMap,
+ const FunctionInfoIndex &Index, ModuleLazyLoaderCache &ModuleLoaderCache) {
while (!Worklist.empty()) {
auto CalledFunctionName = Worklist.pop_back_val();
DEBUG(dbgs() << DestModule.getModuleIdentifier() << "Process import for "
}
// Get the module path from the summary.
- auto FileName = Summary->modulePath();
- DEBUG(dbgs() << "Importing " << CalledFunctionName << " from " << FileName
- << "\n");
+ auto ModuleIdentifier = Summary->modulePath();
+ DEBUG(dbgs() << DestModule.getModuleIdentifier() << " Importing "
+ << CalledFunctionName << " from " << ModuleIdentifier << "\n");
- // Get the module for the import
- auto SrcModule = LazyModuleLoader(FileName);
- assert(&SrcModule->getContext() == &DestModule.getContext());
+ auto &SrcModule = ModuleLoaderCache(ModuleIdentifier);
// The function that we will import!
- GlobalValue *SGV = SrcModule->getNamedValue(CalledFunctionName);
- StringRef ImportFunctionName = CalledFunctionName;
+ GlobalValue *SGV = SrcModule.getNamedValue(CalledFunctionName);
+
if (!SGV) {
- // Might be local in source Module, promoted/renamed in DestModule.
+ // The destination module is referencing function using their renamed name
+ // when importing a function that was originally local in the source
+ // module. The source module we have might not have been renamed so we try
+ // to remove the suffix added during the renaming to recover the original
+ // name in the source module.
std::pair<StringRef, StringRef> Split =
CalledFunctionName.split(".llvm.");
- SGV = SrcModule->getNamedValue(Split.first);
-#ifndef NDEBUG
- // Assert that Split.second is module id
- uint64_t ModuleId;
- assert(!Split.second.getAsInteger(10, ModuleId));
- assert(ModuleId == Index.getModuleId(FileName));
-#endif
+ SGV = SrcModule.getNamedValue(Split.first);
+ assert(SGV && "Can't find function to import in source module");
}
+ if (!SGV) {
+ report_fatal_error(Twine("Can't load function '") + CalledFunctionName +
+ "' in Module '" + SrcModule.getModuleIdentifier() +
+ "', error in the summary?\n");
+ }
+
Function *F = dyn_cast<Function>(SGV);
if (!F && isa<GlobalAlias>(SGV)) {
auto *SGA = dyn_cast<GlobalAlias>(SGV);
F = dyn_cast<Function>(SGA->getBaseObject());
- ImportFunctionName = F->getName();
- }
- if (!F) {
- errs() << "Can't load function '" << CalledFunctionName << "' in Module '"
- << FileName << "', error in the summary?\n";
- llvm_unreachable("Can't load function in Module");
+ CalledFunctionName = F->getName();
}
+ assert(F && "Imported Function is ... not a Function");
// We cannot import weak_any functions/aliases without possibly affecting
// the order they are seen and selected by the linker, changing program
DEBUG(dbgs() << DestModule.getModuleIdentifier()
<< " Ignoring import request for weak-any "
<< (isa<Function>(SGV) ? "function " : "alias ")
- << CalledFunctionName << " from " << FileName << "\n");
+ << CalledFunctionName << " from "
+ << SrcModule.getModuleIdentifier() << "\n");
continue;
}
- // Link in the specified function.
- DenseSet<const GlobalValue *> FunctionsToImport;
- FunctionsToImport.insert(F);
- if (TheLinker.linkInModule(*SrcModule, Linker::Flags::None, &Index,
- &FunctionsToImport))
- report_fatal_error("Function Import: link error");
+ // Add the function to the import list
+ auto &Entry = ModuleToFunctionsToImportMap[SrcModule.getModuleIdentifier()];
+ Entry.first = &SrcModule;
+ Entry.second.insert(F);
- // Process the newly imported function and add callees to the worklist.
- GlobalValue *NewGV = DestModule.getNamedValue(ImportFunctionName);
- assert(NewGV);
- Function *NewF = dyn_cast<Function>(NewGV);
- assert(NewF);
- findExternalCalls(*NewF, CalledFunctions, Worklist);
- ++ImportCount;
+ // Process the newly imported functions and add callees to the worklist.
+ F->materialize();
+ findExternalCalls(DestModule, *F, Index, CalledFunctions, Worklist);
}
- return ImportCount;
}
// Automatically import functions in Module \p DestModule based on the summaries
for (auto &F : DestModule) {
if (F.isDeclaration() || F.hasFnAttribute(Attribute::OptimizeNone))
continue;
- findExternalCalls(F, CalledFunctions, Worklist);
+ findExternalCalls(DestModule, F, Index, CalledFunctions, Worklist);
}
if (Worklist.empty())
return false;
// Linker that will be used for importing function
Linker TheLinker(DestModule, DiagnosticHandler);
- ImportedCount += ProcessImportWorklist(DestModule, Worklist, CalledFunctions,
- TheLinker, Index, ModuleLoader);
+ // Map of Module -> List of Function to import from the Module
+ std::map<StringRef, std::pair<Module *, DenseSet<const GlobalValue *>>>
+ ModuleToFunctionsToImportMap;
- DEBUG(errs() << "Imported " << ImportedCount << " functions for Module "
+ // Analyze the summaries and get the list of functions to import by
+ // populating ModuleToFunctionsToImportMap
+ ModuleLazyLoaderCache ModuleLoaderCache(ModuleLoader);
+ GetImportList(DestModule, Worklist, CalledFunctions,
+ ModuleToFunctionsToImportMap, Index, ModuleLoaderCache);
+ assert(Worklist.empty() && "Worklist hasn't been flushed in GetImportList");
+
+ // Do the actual import of functions now, one Module at a time
+ for (auto &FunctionsToImportPerModule : ModuleToFunctionsToImportMap) {
+ // Get the module for the import
+ auto &FunctionsToImport = FunctionsToImportPerModule.second.second;
+ auto *SrcModule = FunctionsToImportPerModule.second.first;
+ assert(&DestModule.getContext() == &SrcModule->getContext() &&
+ "Context mismatch");
+
+ // Link in the specified functions.
+ if (TheLinker.linkInModule(*SrcModule, Linker::Flags::None, &Index,
+ &FunctionsToImport))
+ report_fatal_error("Function Import: link error");
+
+ ImportedCount += FunctionsToImport.size();
+ }
+ DEBUG(dbgs() << "Imported " << ImportedCount << " functions for Module "
<< DestModule.getModuleIdentifier() << "\n");
return ImportedCount;
}
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