#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
+#include "llvm/Transforms/Utils/ValueMapper.h"
#include <sstream>
namespace llvm {
public:
typedef std::function<TargetAddress()> CompileFtor;
- typedef std::function<void(TargetAddress)> UpdateFtor;
/// @brief Handle to a newly created compile callback. Can be used to get an
/// IR constant representing the address of the trampoline, and to set
- /// the compile and update actions for the callback.
+ /// the compile action for the callback.
class CompileCallbackInfo {
public:
- CompileCallbackInfo(TargetAddress Addr, CompileFtor &Compile,
- UpdateFtor &Update)
- : Addr(Addr), Compile(Compile), Update(Update) {}
+ CompileCallbackInfo(TargetAddress Addr, CompileFtor &Compile)
+ : Addr(Addr), Compile(Compile) {}
TargetAddress getAddress() const { return Addr; }
void setCompileAction(CompileFtor Compile) {
this->Compile = std::move(Compile);
}
- void setUpdateAction(UpdateFtor Update) {
- this->Update = std::move(Update);
- }
private:
TargetAddress Addr;
CompileFtor &Compile;
- UpdateFtor &Update;
};
/// @brief Construct a JITCompileCallbackManagerBase.
/// @brief Execute the callback for the given trampoline id. Called by the JIT
/// to compile functions on demand.
- TargetAddress executeCompileCallback(TargetAddress TrampolineID) {
- TrampolineMapT::iterator I = ActiveTrampolines.find(TrampolineID);
+ TargetAddress executeCompileCallback(TargetAddress TrampolineAddr) {
+ auto I = ActiveTrampolines.find(TrampolineAddr);
// FIXME: Also raise an error in the Orc error-handler when we finally have
// one.
if (I == ActiveTrampolines.end())
// Moving the trampoline ID back to the available list first means there's at
// least one available trampoline if the compile action triggers a request for
// a new one.
- AvailableTrampolines.push_back(I->first);
- auto CallbackHandler = std::move(I->second);
+ auto Compile = std::move(I->second);
ActiveTrampolines.erase(I);
+ AvailableTrampolines.push_back(TrampolineAddr);
- if (auto Addr = CallbackHandler.Compile()) {
- CallbackHandler.Update(Addr);
+ if (auto Addr = Compile())
return Addr;
- }
+
return ErrorHandlerAddress;
}
- /// @brief Get/create a compile callback with the given signature.
+ /// @brief Reserve a compile callback.
virtual CompileCallbackInfo getCompileCallback(LLVMContext &Context) = 0;
-protected:
+ /// @brief Get a CompileCallbackInfo for an existing callback.
+ CompileCallbackInfo getCompileCallbackInfo(TargetAddress TrampolineAddr) {
+ auto I = ActiveTrampolines.find(TrampolineAddr);
+ assert(I != ActiveTrampolines.end() && "Not an active trampoline.");
+ return CompileCallbackInfo(I->first, I->second);
+ }
- struct CallbackHandler {
- CompileFtor Compile;
- UpdateFtor Update;
- };
+ /// @brief Release a compile callback.
+ ///
+ /// Note: Callbacks are auto-released after they execute. This method should
+ /// only be called to manually release a callback that is not going to
+ /// execute.
+ void releaseCompileCallback(TargetAddress TrampolineAddr) {
+ auto I = ActiveTrampolines.find(TrampolineAddr);
+ assert(I != ActiveTrampolines.end() && "Not an active trampoline.");
+ ActiveTrampolines.erase(I);
+ AvailableTrampolines.push_back(TrampolineAddr);
+ }
+protected:
TargetAddress ErrorHandlerAddress;
unsigned NumTrampolinesPerBlock;
- typedef std::map<TargetAddress, CallbackHandler> TrampolineMapT;
+ typedef std::map<TargetAddress, CompileFtor> TrampolineMapT;
TrampolineMapT ActiveTrampolines;
std::vector<TargetAddress> AvailableTrampolines;
+
+private:
+ virtual void anchor();
};
/// @brief Manage compile callbacks.
/// @brief Get/create a compile callback with the given signature.
CompileCallbackInfo getCompileCallback(LLVMContext &Context) final {
TargetAddress TrampolineAddr = getAvailableTrampolineAddr(Context);
- auto &CallbackHandler =
- this->ActiveTrampolines[TrampolineAddr];
-
- return CompileCallbackInfo(TrampolineAddr, CallbackHandler.Compile,
- CallbackHandler.Update);
+ auto &Compile = this->ActiveTrampolines[TrampolineAddr];
+ return CompileCallbackInfo(TrampolineAddr, Compile);
}
private:
TargetAddress ResolverBlockAddr;
};
-/// @brief Get an update functor that updates the value of a named function
-/// pointer.
-template <typename JITLayerT>
-JITCompileCallbackManagerBase::UpdateFtor
-getLocalFPUpdater(JITLayerT &JIT, typename JITLayerT::ModuleSetHandleT H,
- std::string Name) {
- // FIXME: Move-capture Name once we can use C++14.
- return [=,&JIT](TargetAddress Addr) {
- auto FPSym = JIT.findSymbolIn(H, Name, true);
- assert(FPSym && "Cannot find function pointer to update.");
- void *FPAddr = reinterpret_cast<void*>(
- static_cast<uintptr_t>(FPSym.getAddress()));
- memcpy(FPAddr, &Addr, sizeof(uintptr_t));
- };
+/// @brief Base class for managing collections of named indirect stubs.
+class IndirectStubsManagerBase {
+public:
+
+ /// @brief Map type for initializing the manager. See init.
+ typedef StringMap<std::pair<TargetAddress, JITSymbolFlags>> StubInitsMap;
+
+ virtual ~IndirectStubsManagerBase() {}
+
+ /// @brief Create StubInits.size() stubs with the given names, target
+ /// addresses, and flags.
+ virtual std::error_code createStubs(const StubInitsMap &StubInits) = 0;
+
+ /// @brief Find the stub with the given name. If ExportedStubsOnly is true,
+ /// this will only return a result if the stub's flags indicate that it
+ /// is exported.
+ virtual JITSymbol findStub(StringRef Name, bool ExportedStubsOnly) = 0;
+
+ /// @brief Find the implementation-pointer for the stub.
+ virtual JITSymbol findPointer(StringRef Name) = 0;
+
+ /// @brief Change the value of the implementation pointer for the stub.
+ virtual std::error_code updatePointer(StringRef Name, TargetAddress NewAddr) = 0;
+private:
+ virtual void anchor();
+};
+
+/// @brief IndirectStubsManager implementation for a concrete target, e.g. OrcX86_64.
+/// (See OrcTargetSupport.h).
+template <typename TargetT>
+class IndirectStubsManager : public IndirectStubsManagerBase {
+public:
+
+ std::error_code
+ createStubs(const StubInitsMap &StubInits) override {
+ if (auto EC = TargetT::emitIndirectStubsBlock(IndirectStubsInfo,
+ StubInits.size(),
+ nullptr))
+ return EC;
+
+ unsigned I = 0;
+ for (auto &Entry : StubInits) {
+ *IndirectStubsInfo.getPtr(I) =
+ reinterpret_cast<void*>(static_cast<uintptr_t>(Entry.second.first));
+ StubIndexes[Entry.first()] = std::make_pair(I++, Entry.second.second);
+ }
+
+ return std::error_code();
+ }
+
+ JITSymbol findStub(StringRef Name, bool ExportedStubsOnly) override {
+ auto I = StubIndexes.find(Name);
+ if (I == StubIndexes.end())
+ return nullptr;
+ void *StubAddr = IndirectStubsInfo.getStub(I->second.first);
+ assert(StubAddr && "Missing stub address");
+ auto StubTargetAddr =
+ static_cast<TargetAddress>(reinterpret_cast<uintptr_t>(StubAddr));
+ auto StubSymbol = JITSymbol(StubTargetAddr, I->second.second);
+ if (ExportedStubsOnly && !StubSymbol.isExported())
+ return nullptr;
+ return StubSymbol;
+ }
+
+ JITSymbol findPointer(StringRef Name) override {
+ auto I = StubIndexes.find(Name);
+ if (I == StubIndexes.end())
+ return nullptr;
+ void *PtrAddr = IndirectStubsInfo.getPtr(StubIndexes[Name].first);
+ assert(PtrAddr && "Missing pointer address");
+ auto PtrTargetAddr =
+ static_cast<TargetAddress>(reinterpret_cast<uintptr_t>(PtrAddr));
+ return JITSymbol(PtrTargetAddr, JITSymbolFlags::None);
+ }
+
+ std::error_code updatePointer(StringRef Name, TargetAddress NewAddr) override {
+ assert(StubIndexes.count(Name) && "No stub pointer for symbol");
+ *IndirectStubsInfo.getPtr(StubIndexes[Name].first) =
+ reinterpret_cast<void*>(static_cast<uintptr_t>(NewAddr));
+ return std::error_code();
}
+private:
+ typename TargetT::IndirectStubsInfo IndirectStubsInfo;
+ StringMap<std::pair<unsigned, JITSymbolFlags>> StubIndexes;
+};
+
/// @brief Build a function pointer of FunctionType with the given constant
/// address.
///
/// @brief Turn a function declaration into a stub function that makes an
/// indirect call using the given function pointer.
-void makeStub(Function &F, GlobalVariable &ImplPointer);
+void makeStub(Function &F, Value &ImplPointer);
-typedef std::map<Module*, DenseSet<const GlobalValue*>> ModulePartitionMap;
-
-/// @brief Extract subsections of a Module into the given Module according to
-/// the given ModulePartitionMap.
-void partition(Module &M, const ModulePartitionMap &PMap);
-
-/// @brief Struct for trivial "complete" partitioning of a module.
-class FullyPartitionedModule {
-public:
- std::unique_ptr<Module> GlobalVars;
- std::unique_ptr<Module> Commons;
- std::vector<std::unique_ptr<Module>> Functions;
-
- FullyPartitionedModule() = default;
- FullyPartitionedModule(FullyPartitionedModule &&S)
- : GlobalVars(std::move(S.GlobalVars)), Commons(std::move(S.Commons)),
- Functions(std::move(S.Functions)) {}
-};
+/// @brief Raise linkage types and rename as necessary to ensure that all
+/// symbols are accessible for other modules.
+///
+/// This should be called before partitioning a module to ensure that the
+/// partitions retain access to each other's symbols.
+void makeAllSymbolsExternallyAccessible(Module &M);
-/// @brief Extract every function in M into a separate module.
-FullyPartitionedModule fullyPartition(Module &M);
+/// @brief Clone a function declaration into a new module.
+///
+/// This function can be used as the first step towards creating a callback
+/// stub (see makeStub), or moving a function body (see moveFunctionBody).
+///
+/// If the VMap argument is non-null, a mapping will be added between F and
+/// the new declaration, and between each of F's arguments and the new
+/// declaration's arguments. This map can then be passed in to moveFunction to
+/// move the function body if required. Note: When moving functions between
+/// modules with these utilities, all decls should be cloned (and added to a
+/// single VMap) before any bodies are moved. This will ensure that references
+/// between functions all refer to the versions in the new module.
+Function* cloneFunctionDecl(Module &Dst, const Function &F,
+ ValueToValueMapTy *VMap = nullptr);
+
+/// @brief Move the body of function 'F' to a cloned function declaration in a
+/// different module (See related cloneFunctionDecl).
+///
+/// If the target function declaration is not supplied via the NewF parameter
+/// then it will be looked up via the VMap.
+///
+/// This will delete the body of function 'F' from its original parent module,
+/// but leave its declaration.
+void moveFunctionBody(Function &OrigF, ValueToValueMapTy &VMap,
+ ValueMaterializer *Materializer = nullptr,
+ Function *NewF = nullptr);
+
+/// @brief Clone a global variable declaration into a new module.
+GlobalVariable* cloneGlobalVariableDecl(Module &Dst, const GlobalVariable &GV,
+ ValueToValueMapTy *VMap = nullptr);
+
+/// @brief Move global variable GV from its parent module to cloned global
+/// declaration in a different module.
+///
+/// If the target global declaration is not supplied via the NewGV parameter
+/// then it will be looked up via the VMap.
+///
+/// This will delete the initializer of GV from its original parent module,
+/// but leave its declaration.
+void moveGlobalVariableInitializer(GlobalVariable &OrigGV,
+ ValueToValueMapTy &VMap,
+ ValueMaterializer *Materializer = nullptr,
+ GlobalVariable *NewGV = nullptr);
+
+/// @brief Clone
+GlobalAlias* cloneGlobalAliasDecl(Module &Dst, const GlobalAlias &OrigA,
+ ValueToValueMapTy &VMap);
} // End namespace orc.
} // End namespace llvm.
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