llvm::GlobalMergeFunc Class Reference

GlobalMergeFunc is a ModulePass that implements a function merging mechanism using stable function hashes. More...

#include "llvm/CodeGen/GlobalMergeFunctions.h"

Public Member Functions
	GlobalMergeFunc (const ModuleSummaryIndex *Index)
void	initializeMergerMode (const Module &M)
bool	run (Module &M)
void	analyze (Module &M)
	Analyze module to create stable function into LocalFunctionMap.
void	emitFunctionMap (Module &M)
	Emit LocalFunctionMap into __llvm_merge section.
bool	merge (Module &M, const StableFunctionMap *FunctionMap)
	Merge functions in the module using the given function map.

Static Public Attributes
static constexpr const char	MergingInstanceSuffix [] = ".Tgm"
	The suffix used to identify the merged function that parameterizes the constant values.

Detailed Description

GlobalMergeFunc is a ModulePass that implements a function merging mechanism using stable function hashes.

It identifies and merges functions with matching hashes across modules to optimize binary size.

Definition at line 50 of file GlobalMergeFunctions.h.

Constructor & Destructor Documentation

GlobalMergeFunc()

llvm::GlobalMergeFunc::GlobalMergeFunc ( const ModuleSummaryIndex * Index )

inline

Definition at line 63 of file GlobalMergeFunctions.h.

Member Function Documentation

analyze()

void GlobalMergeFunc::analyze

(

Module &

M

)

Analyze module to create stable function into LocalFunctionMap.

Definition at line 149 of file GlobalMergeFunctions.cpp.

References llvm::SmallVectorImpl< T >::emplace_back(), llvm::get_stable_name(), ignoreOp(), isEligibleFunction(), and llvm::StructuralHashWithDifferences().

Referenced by run().

emitFunctionMap()

void GlobalMergeFunc::emitFunctionMap

(

Module &

M

)

Emit LocalFunctionMap into __llvm_merge section.

Definition at line 524 of file GlobalMergeFunctions.cpp.

References llvm::dbgs(), llvm::embedBufferInModule(), llvm::getCodeGenDataSectionName(), llvm::MemoryBuffer::getMemBuffer(), LLVM_DEBUG, llvm::CGDataOStream::patch(), llvm::StableFunctionMapRecord::serialize(), and llvm::raw_svector_ostream::str().

Referenced by run().

initializeMergerMode()

void GlobalMergeFunc::initializeMergerMode

(

const Module &

M

)

Definition at line 505 of file GlobalMergeFunctions.cpp.

References BuildingHashFuncion, DisableCGDataForMerging, llvm::cgdata::emitCGData(), llvm::cgdata::hasStableFunctionMap(), and UsingHashFunction.

Referenced by run().

merge()

bool GlobalMergeFunc::merge	(	Module &	M,
		const StableFunctionMap *	FunctionMap )

Merge functions in the module using the given function map.

Definition at line 392 of file GlobalMergeFunctions.cpp.

References assert(), llvm::StableFunctionMap::at(), llvm::cast(), Changed, checkConstHashCompatible(), checkConstLocationCompatible(), computeParamInfo(), llvm::StableFunctionMap::contains(), createMergedFunction(), createThunk(), llvm::dbgs(), llvm::Value::dump(), llvm::SmallVectorImpl< T >::emplace_back(), F, llvm::Value::getName(), ignoreOp(), llvm::StableFunctionMap::StableFunctionEntry::IndexOperandHashMap, llvm::StableFunctionMap::StableFunctionEntry::InstCount, isEligibleFunction(), LLVM_DEBUG, llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::size(), llvm::SmallVectorTemplateCommon< T, typename >::size(), and llvm::StructuralHashWithDifferences().

Referenced by run().

run()

bool GlobalMergeFunc::run

(

Module &

M

)

Definition at line 547 of file GlobalMergeFunctions.cpp.

References analyze(), BuildingHashFuncion, emitFunctionMap(), llvm::cgdata::getStableFunctionMap(), initializeMergerMode(), merge(), and UsingHashFunction.

Referenced by llvm::GlobalMergeFuncPass::run().

Member Data Documentation

MergingInstanceSuffix

const char llvm::GlobalMergeFunc::MergingInstanceSuffix[] = ".Tgm"

staticconstexpr

The suffix used to identify the merged function that parameterizes the constant values.

Note that the original function, without this suffix, becomes a thunk supplying contexts to the merged function via parameters.

Definition at line 61 of file GlobalMergeFunctions.h.

Referenced by createMergedFunction().

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

• include/llvm/CodeGen/GlobalMergeFunctions.h
• lib/CodeGen/GlobalMergeFunctions.cpp