llvm::DroppedVariableStatsMIR

Synopsis

Declared in <llvm/CodeGen/DroppedVariableStatsMIR.h>

class DroppedVariableStatsMIR
    : public DroppedVariableStats

After every MIR pass is run, it will print how many #DBG_VALUEs were dropped due to that pass.

Name	Description
`DroppedVariableStats`	A base class to collect and print dropped debug information variable statistics.

Name	Description
`DroppedVariableStatsMIR` [constructor]	Create a collector for dropped MIR debug variable statistics.
`operator=` [deleted]	Copy assignment is deleted; this class is unique per compilation.
`getPassDroppedVariables`	Return true if the most recent pass dropped any debug variables.
`runAfterPass`	Collect debug variable state after a MIR pass runs and report drops.
`runBeforePass`	Collect debug variable state before a MIR pass runs.

Name	Description
`DebugVariables`	Per-function debug variable sets recorded before and after a pass.

Name	Description
`calculateDroppedStatsAndPrint`	Calculate the number of dropped variables in an llvm::Function or llvm::MachineFunction and print the relevant information to stdout.
`cleanup`	Pop the most recent level from the per-pass tracking stacks.
`populateVarIDSetAndInlinedMap`	Populate the VarIDSet and InlinedAtMap with the relevant information needed for before and after pass analysis to determine dropped variable status.
`run`	Run code to populate relevant data structures over an llvm::Function or llvm::MachineFunction.
`setup`	Push a new empty level onto the per-pass tracking stacks.
`updateDroppedCount`	Check if a `Var` has been dropped or is a false positive. Also update the `DroppedCount` if a debug variable is dropped.
`visitEveryDebugRecord` [virtual]	Visit every debug record in an llvm::Function or llvm::MachineFunction and call populateVarIDSetAndInlinedMap on it.
`visitEveryInstruction` [virtual]	Visit every llvm::Instruction or llvm::MachineInstruction and check if the debug variable denoted by its ID `Var` may have been dropped by an optimization pass.

Name	Description
`DebugVariablesStack`	A stack of a DenseMap, that maps DebugVariables for every pass to an llvm::Function. A stack is used because an optimization pass can call other passes.
`DroppedVariableStatsEnabled`	True when dropped-variable statistics collection is enabled.
`InlinedAts`	A stack of DenseMaps, which map the name of an llvm::Function to a DenseMap of VarIDs and their inlinedAt locations before an optimization pass has run.
`VisitedScope`	A DenseSet tracking whether a scope was visited before.