LLVM: llvm::GlobalStatus Struct Reference (original) (raw)

As we analyze each global or thread-local variable, keep track of some information about it. More...

#include "[llvm/Transforms/Utils/GlobalStatus.h](GlobalStatus%5F8h%5Fsource.html)"

Public Types
enum StoredType { NotStored, InitializerStored, StoredOnce, Stored }
Keep track of what stores to the global look like. More...
Public Member Functions
Value * getStoredOnceValue () const
If only one value (besides the initializer constant) is ever stored to this global return the stored value.
GlobalStatus ()
Public Attributes
bool IsCompared = false
True if the global's address is used in a comparison.
bool IsLoaded = false
True if the global is ever loaded.
unsigned NumStores = 0
Number of stores to the global.
enum llvm::GlobalStatus::StoredType StoredType = NotStored
const StoreInst * StoredOnceStore = nullptr
If only one value (besides the initializer constant) is ever stored to this global, keep track of what value it is via the store instruction.
const Function * AccessingFunction = nullptr
These start out null/false.
bool HasMultipleAccessingFunctions = false
AtomicOrdering Ordering = AtomicOrdering::NotAtomic
Set to the strongest atomic ordering requirement.

As we analyze each global or thread-local variable, keep track of some information about it.

If we find out that the address of the global is taken, none of this info will be accurate.

Definition at line 30 of file GlobalStatus.h.

◆ StoredType

Keep track of what stores to the global look like.

Enumerator
NotStored There is no store to this global. It can thus be marked constant.
InitializerStored This global is stored to, but the only thing stored is the constant it was initialized with. This is only tracked for scalar globals.
StoredOnce This global is stored to, but only its initializer and one other value is ever stored to it. If this global isStoredOnce, we track the value stored to it via StoredOnceStore below. This is only tracked for scalar globals.
Stored This global is stored to by multiple values or something else that we cannot track.

Definition at line 42 of file GlobalStatus.h.

GlobalStatus::GlobalStatus ( ) default

◆ analyzeGlobal()

◆ getStoredOnceValue()

Value * llvm::GlobalStatus::getStoredOnceValue ( ) const inline

◆ AccessingFunction

These start out null/false.

When the first accessing function is noticed, it is recorded. When a second different accessing function is noticed, HasMultipleAccessingFunctions is set to true.

Definition at line 76 of file GlobalStatus.h.

◆ HasMultipleAccessingFunctions

bool llvm::GlobalStatus::HasMultipleAccessingFunctions = false

◆ IsCompared

bool llvm::GlobalStatus::IsCompared = false

True if the global's address is used in a comparison.

Definition at line 32 of file GlobalStatus.h.

◆ IsLoaded

bool llvm::GlobalStatus::IsLoaded = false

True if the global is ever loaded.

If the global isn't ever loaded it can be deleted.

Definition at line 36 of file GlobalStatus.h.

◆ NumStores

unsigned llvm::GlobalStatus::NumStores = 0

◆ Ordering

Set to the strongest atomic ordering requirement.

Definition at line 80 of file GlobalStatus.h.

◆ StoredOnceStore

If only one value (besides the initializer constant) is ever stored to this global, keep track of what value it is via the store instruction.

Definition at line 63 of file GlobalStatus.h.

Referenced by getStoredOnceValue().

◆ StoredType

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