Class to build a trie of call stack contexts for a particular profiled allocation call, along with their associated allocation types. More...

#include "llvm/Analysis/MemoryProfileInfo.h"

Public Member Functions
	CallStackTrie ()=default

	~CallStackTrie ()

bool	empty () const

void	addCallStack (AllocationType AllocType, ArrayRef< uint64_t > StackIds)
	Add a call stack context with the given allocation type to the Trie.

void	addCallStack (MDNode *MIB)
	Add the call stack context along with its allocation type from the MIB metadata to the Trie.

bool	buildAndAttachMIBMetadata (CallBase *CI)
	Build and attach the minimal necessary MIB metadata.

Detailed Description

Class to build a trie of call stack contexts for a particular profiled allocation call, along with their associated allocation types.

The allocation will be at the root of the trie, which is then used to compute the minimum lists of context ids needed to associate a call context with a single allocation type.

Definition at line 51 of file MemoryProfileInfo.h.

Constructor & Destructor Documentation

◆ CallStackTrie()

llvm::memprof::CallStackTrie::CallStackTrie ( )

default

◆ ~CallStackTrie()

llvm::memprof::CallStackTrie::~CallStackTrie ( )

inline

Definition at line 84 of file MemoryProfileInfo.h.

Member Function Documentation

◆ addCallStack() [1/2]

void CallStackTrie::addCallStack	(	AllocationType	AllocType,
		ArrayRef< uint64_t >	StackIds
	)

Add a call stack context with the given allocation type to the Trie.

The context is represented by the list of stack ids (computed during matching via a debug location hash), expected to be in order from the allocation call down to the bottom of the call stack (i.e. callee to caller order).

Definition at line 127 of file MemoryProfileInfo.cpp.

References assert(), and llvm::First.

Referenced by addCallStack(), and addCallStack().

◆ addCallStack() [2/2]

void CallStackTrie::addCallStack ( MDNode * MIB )

Add the call stack context along with its allocation type from the MIB metadata to the Trie.

Definition at line 160 of file MemoryProfileInfo.cpp.

References addCallStack(), assert(), llvm::memprof::getMIBAllocType(), llvm::memprof::getMIBStackNode(), llvm::MDNode::getNumOperands(), and llvm::MDNode::operands().

◆ buildAndAttachMIBMetadata()

bool CallStackTrie::buildAndAttachMIBMetadata ( CallBase * CI )

Build and attach the minimal necessary MIB metadata.

If the alloc has a single allocation type, add a function attribute instead. The reason for adding an attribute in this case is that it matches how the behavior for allocation calls will be communicated to lib call simplification after cloning or another optimization to distinguish the allocation types, which is lower overhead and more direct than maintaining this metadata. Returns true if memprof metadata attached, false if not (attribute added).

Definition at line 237 of file MemoryProfileInfo.cpp.

References addAllocTypeAttribute(), assert(), llvm::MDNode::get(), llvm::Value::getContext(), llvm::memprof::hasSingleAllocType(), llvm::NotCold, and llvm::Instruction::setMetadata().

Referenced by readMemprof().

◆ empty()

bool llvm::memprof::CallStackTrie::empty ( ) const