WholeProgramDevirt.cpp File Reference

#include "llvm/Transforms/IPO/WholeProgramDevirt.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseMapInfo.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Triple.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/BasicAliasAnalysis.h"
#include "llvm/Analysis/OptimizationRemarkEmitter.h"
#include "llvm/Analysis/TypeMetadataUtils.h"
#include "llvm/Bitcode/BitcodeReader.h"
#include "llvm/Bitcode/BitcodeWriter.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalAlias.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/ModuleSummaryIndexYAML.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/PassRegistry.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/GlobPattern.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/IPO/FunctionAttrs.h"
#include "llvm/Transforms/Utils/Evaluator.h"
#include <algorithm>
#include <cstddef>
#include <map>
#include <set>
#include <string>

Go to the source code of this file.

Classes
struct	llvm::DenseMapInfo< VTableSlot >
struct	llvm::DenseMapInfo< VTableSlotSummary >

Namespaces
	llvm
	This class represents lattice values for constants.

Macros
#define	DEBUG_TYPE   "wholeprogramdevirt"

Functions
	INITIALIZE_PASS_BEGIN (WholeProgramDevirt, "wholeprogramdevirt", "Whole program devirtualization", false, false) INITIALIZE_PASS_END(WholeProgramDevirt
static bool	hasWholeProgramVisibility (bool WholeProgramVisibilityEnabledInLTO)
void	llvm::updateVCallVisibilityInModule (Module &M, bool WholeProgramVisibilityEnabledInLTO)
	If whole program visibility asserted, then upgrade all public vcall visibility metadata on vtable definitions to linkage unit visibility in Module IR (for regular or hybrid LTO). More...
void	llvm::updateVCallVisibilityInIndex (ModuleSummaryIndex &Index, bool WholeProgramVisibilityEnabledInLTO)
	If whole program visibility asserted, then upgrade all public vcall visibility metadata on vtable definition summaries to linkage unit visibility in Module summary index (for ThinLTO). More...
void	llvm::runWholeProgramDevirtOnIndex (ModuleSummaryIndex &Summary, std::set< GlobalValue::GUID > &ExportedGUIDs, std::map< ValueInfo, std::vector< VTableSlotSummary >> &LocalWPDTargetsMap)
	Perform index-based whole program devirtualization on the Summary index. More...
void	llvm::updateIndexWPDForExports (ModuleSummaryIndex &Summary, function_ref< bool(StringRef, ValueInfo)> isExported, std::map< ValueInfo, std::vector< VTableSlotSummary >> &LocalWPDTargetsMap)
	Call after cross-module importing to update the recorded single impl devirt target names for any locals that were exported. More...
static Error	checkCombinedSummaryForTesting (ModuleSummaryIndex *Summary)
static bool	AddCalls (VTableSlotInfo &SlotInfo, const ValueInfo &Callee)

Variables
static cl::opt< PassSummaryAction >	ClSummaryAction ("wholeprogramdevirt-summary-action", cl::desc("What to do with the summary when running this pass"), cl::values(clEnumValN(PassSummaryAction::None, "none", "Do nothing"), clEnumValN(PassSummaryAction::Import, "import", "Import typeid resolutions from summary and globals"), clEnumValN(PassSummaryAction::Export, "export", "Export typeid resolutions to summary and globals")), cl::Hidden)
static cl::opt< std::string >	ClReadSummary ("wholeprogramdevirt-read-summary", cl::desc("Read summary from given bitcode or YAML file before running pass"), cl::Hidden)
static cl::opt< std::string >	ClWriteSummary ("wholeprogramdevirt-write-summary", cl::desc("Write summary to given bitcode or YAML file after running pass. " "Output file format is deduced from extension: *.bc means writing " "bitcode, otherwise YAML"), cl::Hidden)
static cl::opt< unsigned >	ClThreshold ("wholeprogramdevirt-branch-funnel-threshold", cl::Hidden, cl::init(10), cl::ZeroOrMore, cl::desc("Maximum number of call targets per " "call site to enable branch funnels"))
static cl::opt< bool >	PrintSummaryDevirt ("wholeprogramdevirt-print-index-based", cl::Hidden, cl::init(false), cl::ZeroOrMore, cl::desc("Print index-based devirtualization messages"))
cl::opt< bool >	WholeProgramVisibility ("whole-program-visibility", cl::init(false), cl::Hidden, cl::ZeroOrMore, cl::desc("Enable whole program visibility"))
	Provide a way to force enable whole program visibility in tests. More...
cl::opt< bool >	DisableWholeProgramVisibility ("disable-whole-program-visibility", cl::init(false), cl::Hidden, cl::ZeroOrMore, cl::desc("Disable whole program visibility (overrides enabling options)"))
	Provide a way to force disable whole program for debugging or workarounds, when enabled via the linker. More...
cl::list< std::string >	SkipFunctionNames ("wholeprogramdevirt-skip", cl::desc("Prevent function(s) from being devirtualized"), cl::Hidden, cl::ZeroOrMore, cl::CommaSeparated)
	Provide way to prevent certain function from being devirtualized. More...
	wholeprogramdevirt
Whole program	devirtualization
Whole program	false

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "wholeprogramdevirt"

Definition at line 107 of file WholeProgramDevirt.cpp.

Function Documentation

AddCalls()

static bool AddCalls ( VTableSlotInfo &  SlotInfo, const ValueInfo &  Callee  )

static

Definition at line 1057 of file WholeProgramDevirt.cpp.

References Callee, llvm::X86AS::FS, llvm::CalleeInfo::Hot, and P.

checkCombinedSummaryForTesting()

static Error checkCombinedSummaryForTesting ( ModuleSummaryIndex *  Summary )

static

Definition at line 845 of file WholeProgramDevirt.cpp.

References ClSummaryAction, llvm::createStringError(), llvm::ModuleSummaryIndex::getRegularLTOModuleName(), llvm::Import, llvm::invalid_argument, and llvm::ModuleSummaryIndex::modulePaths().

hasWholeProgramVisibility()

static bool hasWholeProgramVisibility ( bool  WholeProgramVisibilityEnabledInLTO )

static

Definition at line 770 of file WholeProgramDevirt.cpp.

References DisableWholeProgramVisibility, and WholeProgramVisibility.

Referenced by llvm::updateVCallVisibilityInIndex(), and llvm::updateVCallVisibilityInModule().

INITIALIZE_PASS_BEGIN()

INITIALIZE_PASS_BEGIN	(	WholeProgramDevirt	,
		"wholeprogramdevirt"	,
		"Whole program devirtualization"	,
		false	,
		false
	)

Variable Documentation

ClReadSummary

cl::opt<std::string> ClReadSummary("wholeprogramdevirt-read-summary", cl::desc( "Read summary from given bitcode or YAML file before running pass"), cl::Hidden)

static

ClSummaryAction

cl::opt<PassSummaryAction> ClSummaryAction("wholeprogramdevirt-summary-action", cl::desc("What to do with the summary when running this pass"), cl::values(clEnumValN(PassSummaryAction::None, "none", "Do nothing"), clEnumValN(PassSummaryAction::Import, "import", "Import typeid resolutions from summary and globals"), clEnumValN(PassSummaryAction::Export, "export", "Export typeid resolutions to summary and globals")), cl::Hidden)

static

Referenced by checkCombinedSummaryForTesting().

ClThreshold

cl::opt<unsigned> ClThreshold("wholeprogramdevirt-branch-funnel-threshold", cl::Hidden, cl::init(10), cl::ZeroOrMore, cl::desc("Maximum number of call targets per " "call site to enable branch funnels"))

static

ClWriteSummary

cl::opt<std::string> ClWriteSummary("wholeprogramdevirt-write-summary", cl::desc("Write summary to given bitcode or YAML file after running pass. " "Output file format is deduced from extension: *.bc means writing " "bitcode, otherwise YAML"), cl::Hidden)

static

devirtualization

Whole program devirtualization

Definition at line 734 of file WholeProgramDevirt.cpp.

DisableWholeProgramVisibility

cl::opt<bool> DisableWholeProgramVisibility("disable-whole-program-visibility", cl::init(false), cl::Hidden, cl::ZeroOrMore, cl::desc("Disable whole program visibility (overrides enabling options)"))

Provide a way to force disable whole program for debugging or workarounds, when enabled via the linker.

Referenced by hasWholeProgramVisibility().

false

Whole program false

Definition at line 734 of file WholeProgramDevirt.cpp.

PrintSummaryDevirt

cl::opt<bool> PrintSummaryDevirt("wholeprogramdevirt-print-index-based", cl::Hidden, cl::init(false), cl::ZeroOrMore, cl::desc("Print index-based devirtualization messages"))

static

SkipFunctionNames

cl::list<std::string> SkipFunctionNames("wholeprogramdevirt-skip", cl::desc("Prevent function(s) from being devirtualized"), cl::Hidden, cl::ZeroOrMore, cl::CommaSeparated)

Provide way to prevent certain function from being devirtualized.

wholeprogramdevirt

wholeprogramdevirt

Definition at line 734 of file WholeProgramDevirt.cpp.

WholeProgramVisibility

cl::opt<bool> WholeProgramVisibility("whole-program-visibility", cl::init(false), cl::Hidden, cl::ZeroOrMore, cl::desc("Enable whole program visibility"))

Provide a way to force enable whole program visibility in tests.

This is needed to support legacy tests that don't contain !vcall_visibility metadata (the mere presense of type tests previously implied hidden visibility).

Referenced by hasWholeProgramVisibility().