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JIT: More nitty style tweakage, aka territory marking.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118973 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar
2010-11-13 02:48:57 +00:00
parent afd693cff3
commit 48dd875be1
2 changed files with 206 additions and 247 deletions
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123
include/llvm/ExecutionEngine/ExecutionEngine.h
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@ -41,6 +41,8 @@ class MutexGuard;
class TargetData;
class Type;
/// \brief Helper class for helping synchronize access to the global address map
/// table.
class ExecutionEngineState {
public:
struct AddressMapConfig : public ValueMapConfig<const GlobalValue*> {
@ -70,8 +72,7 @@ private:
public:
ExecutionEngineState(ExecutionEngine &EE);
GlobalAddressMapTy &
getGlobalAddressMap(const MutexGuard &) {
GlobalAddressMapTy &getGlobalAddressMap(const MutexGuard &) {
return GlobalAddressMap;
}
@ -80,23 +81,41 @@ public:
return GlobalAddressReverseMap;
}
// Returns the address ToUnmap was mapped to.
/// \brief Erase an entry from the mapping table.
///
/// \returns The address that \arg ToUnmap was happed to.
void *RemoveMapping(const MutexGuard &, const GlobalValue *ToUnmap);
};
/// \brief Abstract interface for implementation execution of LLVM modules,
/// designed to support both interpreter and just-in-time (JIT) compiler
/// implementations.
class ExecutionEngine {
const TargetData *TD;
/// The state object holding the global address mapping, which must be
/// accessed synchronously.
//
// FIXME: There is no particular need the entire map needs to be
// synchronized. Wouldn't a reader-writer design be better here?
ExecutionEngineState EEState;
/// The target data for the platform for which execution is being performed.
const TargetData *TD;
/// Whether lazy JIT compilation is enabled.
bool CompilingLazily;
/// Whether JIT compilation of external global variables is allowed.
bool GVCompilationDisabled;
/// Whether the JIT should perform lookups of external symbols (e.g.,
/// using dlsym).
bool SymbolSearchingDisabled;
friend class EngineBuilder; // To allow access to JITCtor and InterpCtor.
protected:
/// Modules - This is a list of Modules that we are JIT'ing from. We use a
/// smallvector to optimize for the case where there is only one module.
/// The list of Modules that we are JIT'ing from. We use a SmallVector to
/// optimize for the case where there is only one module.
SmallVector<Module*, 1> Modules;
void setTargetData(const TargetData *td) {
@ -104,11 +123,11 @@ protected:
}
/// getMemoryforGV - Allocate memory for a global variable.
virtual char* getMemoryForGV(const GlobalVariable* GV);
virtual char *getMemoryForGV(const GlobalVariable *GV);
// To avoid having libexecutionengine depend on the JIT and interpreter
// libraries, the JIT and Interpreter set these functions to ctor pointers
// at startup time if they are linked in.
// libraries, the JIT and Interpreter set these functions to ctor pointers at
// startup time if they are linked in.
static ExecutionEngine *(*JITCtor)(
Module *M,
std::string *ErrorStr,
@ -123,8 +142,9 @@ protected:
std::string *ErrorStr);
/// LazyFunctionCreator - If an unknown function is needed, this function
/// pointer is invoked to create it. If this returns null, the JIT will abort.
void* (*LazyFunctionCreator)(const std::string &);
/// pointer is invoked to create it. If this returns null, the JIT will
/// abort.
void *(*LazyFunctionCreator)(const std::string &);
/// ExceptionTableRegister - If Exception Handling is set, the JIT will
/// register dwarf tables with this function.
@ -134,10 +154,10 @@ protected:
std::vector<void*> AllExceptionTables;
public:
/// lock - This lock is protects the ExecutionEngine, JIT, JITResolver and
/// lock - This lock protects the ExecutionEngine, JIT, JITResolver and
/// JITEmitter classes. It must be held while changing the internal state of
/// any of those classes.
sys::Mutex lock; // Used to make this class and subclasses thread-safe
sys::Mutex lock;
//===--------------------------------------------------------------------===//
// ExecutionEngine Startup
@ -148,20 +168,18 @@ public:
/// create - This is the factory method for creating an execution engine which
/// is appropriate for the current machine. This takes ownership of the
/// module.
///
/// \param GVsWithCode - Allocating globals with code breaks
/// freeMachineCodeForFunction and is probably unsafe and bad for performance.
/// However, we have clients who depend on this behavior, so we must support
/// it. Eventually, when we're willing to break some backwards compatability,
/// this flag should be flipped to false, so that by default
/// freeMachineCodeForFunction works.
static ExecutionEngine *create(Module *M,
bool ForceInterpreter = false,
std::string *ErrorStr = 0,
CodeGenOpt::Level OptLevel =
CodeGenOpt::Default,
// Allocating globals with code breaks
// freeMachineCodeForFunction and is probably
// unsafe and bad for performance. However,
// we have clients who depend on this
// behavior, so we must support it.
// Eventually, when we're willing to break
// some backwards compatability, this flag
// should be flipped to false, so that by
// default freeMachineCodeForFunction works.
bool GVsWithCode = true);
/// createJIT - This is the factory method for creating a JIT for the current
@ -186,11 +204,10 @@ public:
Modules.push_back(M);
}
//===----------------------------------------------------------------------===//
//===--------------------------------------------------------------------===//
const TargetData *getTargetData() const { return TD; }
/// removeModule - Remove a Module from the list of modules. Returns true if
/// M is found.
virtual bool removeModule(Module *M);
@ -202,17 +219,19 @@ public:
/// runFunction - Execute the specified function with the specified arguments,
/// and return the result.
///
virtual GenericValue runFunction(Function *F,
const std::vector<GenericValue> &ArgValues) = 0;
/// runStaticConstructorsDestructors - This method is used to execute all of
/// the static constructors or destructors for a program, depending on the
/// value of isDtors.
/// the static constructors or destructors for a program.
///
/// \param isDtors - Run the destructors instead of constructors.
void runStaticConstructorsDestructors(bool isDtors);
/// runStaticConstructorsDestructors - This method is used to execute all of
/// the static constructors or destructors for a module, depending on the
/// value of isDtors.
/// the static constructors or destructors for a particular module.
///
/// \param isDtors - Run the destructors instead of constructors.
void runStaticConstructorsDestructors(Module *module, bool isDtors);
@ -231,8 +250,8 @@ public:
/// GlobalValue is destroyed.
void addGlobalMapping(const GlobalValue *GV, void *Addr);
/// clearAllGlobalMappings - Clear all global mappings and start over again
/// use in dynamic compilation scenarios when you want to move globals
/// clearAllGlobalMappings - Clear all global mappings and start over again,
/// for use in dynamic compilation scenarios to move globals.
void clearAllGlobalMappings();
/// clearGlobalMappingsFromModule - Clear all global mappings that came from a
@ -248,12 +267,10 @@ public:
/// getPointerToGlobalIfAvailable - This returns the address of the specified
/// global value if it is has already been codegen'd, otherwise it returns
/// null.
///
void *getPointerToGlobalIfAvailable(const GlobalValue *GV);
/// getPointerToGlobal - This returns the address of the specified global
/// value. This may involve code generation if it's a function.
///
/// value. This may involve code generation if it's a function.
void *getPointerToGlobal(const GlobalValue *GV);
/// getPointerToFunction - The different EE's represent function bodies in
@ -261,20 +278,17 @@ public:
/// pointer should look like. When F is destroyed, the ExecutionEngine will
/// remove its global mapping and free any machine code. Be sure no threads
/// are running inside F when that happens.
///
virtual void *getPointerToFunction(Function *F) = 0;
/// getPointerToBasicBlock - The different EE's represent basic blocks in
/// different ways. Return the representation for a blockaddress of the
/// specified block.
///
virtual void *getPointerToBasicBlock(BasicBlock *BB) = 0;
/// getPointerToFunctionOrStub - If the specified function has been
/// code-gen'd, return a pointer to the function. If not, compile it, or use
/// a stub to implement lazy compilation if available. See
/// getPointerToFunction for the requirements on destroying F.
///
virtual void *getPointerToFunctionOrStub(Function *F) {
// Default implementation, just codegen the function.
return getPointerToFunction(F);
@ -288,23 +302,25 @@ public:
///
const GlobalValue *getGlobalValueAtAddress(void *Addr);
/// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr.
/// Ptr is the address of the memory at which to store Val, cast to
/// GenericValue *. It is not a pointer to a GenericValue containing the
/// address at which to store Val.
void StoreValueToMemory(const GenericValue &Val, GenericValue *Ptr,
const Type *Ty);
void InitializeMemory(const Constant *Init, void *Addr);
/// recompileAndRelinkFunction - This method is used to force a function
/// which has already been compiled to be compiled again, possibly
/// after it has been modified. Then the entry to the old copy is overwritten
/// with a branch to the new copy. If there was no old copy, this acts
/// just like VM::getPointerToFunction().
///
/// recompileAndRelinkFunction - This method is used to force a function which
/// has already been compiled to be compiled again, possibly after it has been
/// modified. Then the entry to the old copy is overwritten with a branch to
/// the new copy. If there was no old copy, this acts just like
/// VM::getPointerToFunction().
virtual void *recompileAndRelinkFunction(Function *F) = 0;
/// freeMachineCodeForFunction - Release memory in the ExecutionEngine
/// corresponding to the machine code emitted to execute this function, useful
/// for garbage-collecting generated code.
///
virtual void freeMachineCodeForFunction(Function *F) = 0;
/// getOrEmitGlobalVariable - Return the address of the specified global
@ -382,8 +398,8 @@ public:
ExceptionTableDeregister = F;
}
/// RegisterTable - Registers the given pointer as an exception table. It uses
/// the ExceptionTableRegister function.
/// RegisterTable - Registers the given pointer as an exception table. It
/// uses the ExceptionTableRegister function.
void RegisterTable(void* res) {
if (ExceptionTableRegister) {
ExceptionTableRegister(res);
@ -392,7 +408,7 @@ public:
}
/// DeregisterAllTables - Deregisters all previously registered pointers to an
/// exception tables. It uses the ExceptionTableoDeregister function.
/// exception tables. It uses the ExceptionTableoDeregister function.
void DeregisterAllTables();
protected:
@ -400,9 +416,6 @@ protected:
void emitGlobals();
// EmitGlobalVariable - This method emits the specified global variable to the
// address specified in GlobalAddresses, or allocates new memory if it's not
// already in the map.
void EmitGlobalVariable(const GlobalVariable *GV);
GenericValue getConstantValue(const Constant *C);
@ -423,8 +436,7 @@ namespace EngineKind {
/// stack-allocating a builder, chaining the various set* methods, and
/// terminating it with a .create() call.
class EngineBuilder {
private:
private:
Module *M;
EngineKind::Kind WhichEngine;
std::string *ErrorStr;
@ -437,7 +449,6 @@ class EngineBuilder {
SmallVector<std::string, 4> MAttrs;
/// InitEngine - Does the common initialization of default options.
///
void InitEngine() {
WhichEngine = EngineKind::Either;
ErrorStr = NULL;
@ -447,7 +458,7 @@ class EngineBuilder {
CMModel = CodeModel::Default;
}
public:
public:
/// EngineBuilder - Constructor for EngineBuilder. If create() is called and
/// is successful, the created engine takes ownership of the module.
EngineBuilder(Module *m) : M(m) {