ExpressionMetadata

public struct ExpressionMetadata : IRMetadata

ExpressionMetadata nodes represent expressions that are inspired by the DWARF expression language. They are used in debug intrinsics (such as llvm.dbg.declare and llvm.dbg.value) to describe how the referenced LLVM variable relates to the source language variable.

Debug intrinsics are interpreted left-to-right: start by pushing the value/address operand of the intrinsic onto a stack, then repeatedly push and evaluate opcodes from the ExpressionMetadata until the final variable description is produced.

Though DWARF supports hundreds of expressions, LLVM currently implements a very limited subset.


                    
                    
                    asMetadata()

Declaration

Swift

public func asMetadata() -> LLVMMetadataRef

init(llvm:)
Declaration
Swift

public init(llvm: LLVMMetadataRef)