Mediates between MachO initialization and ExecutionSession state. More...

#include "llvm/ExecutionEngine/Orc/MachOPlatform.h"

Inheritance diagram for llvm::orc::MachOPlatform:

Collaboration diagram for llvm::orc::MachOPlatform:

Classes
struct	MachOJITDylibDepInfo

Public Types
using	MachOJITDylibDepInfoMap = std::vector< std::pair< ExecutorAddr, MachOJITDylibDepInfo > >

Public Member Functions
ExecutionSession &	getExecutionSession () const

ObjectLinkingLayer &	getObjectLinkingLayer () const

Error	setupJITDylib (JITDylib &JD) override
	This method will be called outside the session lock each time a JITDylib is created (unless it is created with EmptyJITDylib set) to allow the Platform to install any JITDylib specific standard symbols (e.g __dso_handle). More...

Error	teardownJITDylib (JITDylib &JD) override
	This method will be called outside the session lock each time a JITDylib is removed to allow the Platform to remove any JITDylib-specific data. More...

Error	notifyAdding (ResourceTracker &RT, const MaterializationUnit &MU) override
	This method will be called under the ExecutionSession lock each time a MaterializationUnit is added to a JITDylib. More...

Error	notifyRemoving (ResourceTracker &RT) override
	This method will be called under the ExecutionSession lock when a ResourceTracker is removed. More...

Public Member Functions inherited from llvm::orc::Platform
virtual	~Platform ()

Static Public Member Functions
static Expected< std::unique_ptr< MachOPlatform > >	Create (ExecutionSession &ES, ObjectLinkingLayer &ObjLinkingLayer, JITDylib &PlatformJD, const char *OrcRuntimePath, std::optional< SymbolAliasMap > RuntimeAliases=std::nullopt)
	Try to create a MachOPlatform instance, adding the ORC runtime to the given JITDylib. More...

static SymbolAliasMap	standardPlatformAliases (ExecutionSession &ES)
	Returns an AliasMap containing the default aliases for the MachOPlatform. More...

static ArrayRef< std::pair< const char , const char > >	requiredCXXAliases ()
	Returns the array of required CXX aliases. More...

static ArrayRef< std::pair< const char , const char > >	standardRuntimeUtilityAliases ()
	Returns the array of standard runtime utility aliases for MachO. More...

static bool	isInitializerSection (StringRef SegName, StringRef SectName)
	Returns true if the given section name is an initializer section. More...

Static Public Member Functions inherited from llvm::orc::Platform
static Expected< DenseMap< JITDylib *, SymbolMap > >	lookupInitSymbols (ExecutionSession &ES, const DenseMap< JITDylib *, SymbolLookupSet > &InitSyms)
	A utility function for looking up initializer symbols. More...

static void	lookupInitSymbolsAsync (unique_function< void(Error)> OnComplete, ExecutionSession &ES, const DenseMap< JITDylib *, SymbolLookupSet > &InitSyms)
	Performs an async lookup for the given symbols in each of the given JITDylibs, calling the given handler once all lookups have completed. More...

Detailed Description

Mediates between MachO initialization and ExecutionSession state.

Definition at line 30 of file MachOPlatform.h.

Member Typedef Documentation

◆ MachOJITDylibDepInfoMap

using llvm::orc::MachOPlatform::MachOJITDylibDepInfoMap = std::vector<std::pair<ExecutorAddr, MachOJITDylibDepInfo> >

Definition at line 40 of file MachOPlatform.h.

Member Function Documentation

◆ Create()

Expected< std::unique_ptr< MachOPlatform > > llvm::orc::MachOPlatform::Create	(	ExecutionSession &	ES,
		ObjectLinkingLayer &	ObjLinkingLayer,
		JITDylib &	PlatformJD,
		const char *	OrcRuntimePath,
		std::optional< SymbolAliasMap >	RuntimeAliases = `std::nullopt`
	)

static

Try to create a MachOPlatform instance, adding the ORC runtime to the given JITDylib.

The ORC runtime requires access to a number of symbols in libc++, and requires access to symbols in libobjc, and libswiftCore to support Objective-C and Swift code. It is up to the caller to ensure that the requried symbols can be referenced by code added to PlatformJD. The standard way to achieve this is to first attach dynamic library search generators for either the given process, or for the specific required libraries, to PlatformJD, then to create the platform instance:

auto &PlatformJD = ES.createBareJITDylib("stdlib");
PlatformJD.addGenerator(
  ExitOnErr(EPCDynamicLibrarySearchGenerator
              ::GetForTargetProcess(EPC)));
ES.setPlatform(
  ExitOnErr(MachOPlatform::Create(ES, ObjLayer, EPC, PlatformJD,
                                  "/path/to/orc/runtime")));

Alternatively, these symbols could be added to another JITDylib that PlatformJD links against.

Clients are also responsible for ensuring that any JIT'd code that depends on runtime functions (including any code using TLV or static destructors) can reference the runtime symbols. This is usually achieved by linking any JITDylibs containing regular code against PlatformJD.

By default, MachOPlatform will add the set of aliases returned by the standardPlatformAliases function. This includes both required aliases (e.g. __cxa_atexit -> __orc_rt_macho_cxa_atexit for static destructor support), and optional aliases that provide JIT versions of common functions (e.g. dlopen -> __orc_rt_macho_jit_dlopen). Clients can override these defaults by passing a non-None value for the RuntimeAliases function, in which case the client is responsible for setting up all aliases (including the required ones).

Definition at line 274 of file MachOPlatform.cpp.

References llvm::orc::ExecutionSession::getExecutorProcessControl(), and llvm::inconvertibleErrorCode().

◆ getExecutionSession()

ExecutionSession& llvm::orc::MachOPlatform::getExecutionSession ( ) const

inline

Definition at line 85 of file MachOPlatform.h.

◆ getObjectLinkingLayer()

ObjectLinkingLayer& llvm::orc::MachOPlatform::getObjectLinkingLayer ( ) const

inline

Definition at line 86 of file MachOPlatform.h.

◆ isInitializerSection()

bool llvm::orc::MachOPlatform::isInitializerSection	(	StringRef	SegName,
		StringRef	SectName
	)

static

Returns true if the given section name is an initializer section.

Definition at line 401 of file MachOPlatform.cpp.

Referenced by llvm::orc::getMachOObjectFileSymbolInfo(), and llvm::orc::hasInitializerSection().

◆ notifyAdding()

Error llvm::orc::MachOPlatform::notifyAdding	(	ResourceTracker &	RT,
		const MaterializationUnit &	MU
	)

overridevirtual

This method will be called under the ExecutionSession lock each time a MaterializationUnit is added to a JITDylib.

Implements llvm::orc::Platform.

Definition at line 341 of file MachOPlatform.cpp.

References llvm::dbgs(), llvm::orc::MaterializationUnit::getInitializerSymbol(), llvm::orc::ResourceTracker::getJITDylib(), llvm::orc::MaterializationUnit::getName(), LLVM_DEBUG, llvm::Error::success(), and llvm::orc::WeaklyReferencedSymbol.

◆ notifyRemoving()

Error llvm::orc::MachOPlatform::notifyRemoving ( ResourceTracker & RT )

overridevirtual

This method will be called under the ExecutionSession lock when a ResourceTracker is removed.

Implements llvm::orc::Platform.

Definition at line 357 of file MachOPlatform.cpp.

References llvm_unreachable.

◆ requiredCXXAliases()

ArrayRef< std::pair< const char *, const char * > > llvm::orc::MachOPlatform::requiredCXXAliases ( )

static

Returns the array of required CXX aliases.

Definition at line 379 of file MachOPlatform.cpp.

◆ setupJITDylib()

Error llvm::orc::MachOPlatform::setupJITDylib ( JITDylib & JD )

overridevirtual

This method will be called outside the session lock each time a JITDylib is created (unless it is created with EmptyJITDylib set) to allow the Platform to install any JITDylib specific standard symbols (e.g __dso_handle).

Implements llvm::orc::Platform.

Definition at line 320 of file MachOPlatform.cpp.

◆ standardPlatformAliases()

SymbolAliasMap llvm::orc::MachOPlatform::standardPlatformAliases ( ExecutionSession & ES )

static

Returns an AliasMap containing the default aliases for the MachOPlatform.

This can be modified by clients when constructing the platform to add or remove aliases.

Definition at line 371 of file MachOPlatform.cpp.

References llvm::orc::addAliases().

◆ standardRuntimeUtilityAliases()

ArrayRef< std::pair< const char *, const char * > > llvm::orc::MachOPlatform::standardRuntimeUtilityAliases ( )

static

Returns the array of standard runtime utility aliases for MachO.

Definition at line 387 of file MachOPlatform.cpp.

◆ teardownJITDylib()

Error llvm::orc::MachOPlatform::teardownJITDylib ( JITDylib & JD )

overridevirtual

This method will be called outside the session lock each time a JITDylib is removed to allow the Platform to remove any JITDylib-specific data.

Implements llvm::orc::Platform.

Definition at line 328 of file MachOPlatform.cpp.

References assert(), I, and llvm::Error::success().

The documentation for this class was generated from the following files:

include/llvm/ExecutionEngine/Orc/MachOPlatform.h
lib/ExecutionEngine/Orc/MachOPlatform.cpp

Classes

Public Types

Public Member Functions

Static Public Member Functions

Detailed Description

Member Typedef Documentation

◆ MachOJITDylibDepInfoMap

Member Function Documentation

◆ Create()

◆ getExecutionSession()

◆ getObjectLinkingLayer()

◆ isInitializerSection()

◆ notifyAdding()

◆ notifyRemoving()

◆ requiredCXXAliases()

◆ setupJITDylib()

◆ standardPlatformAliases()

◆ standardRuntimeUtilityAliases()

◆ teardownJITDylib()