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//===--- AliasInfoDumper.swift --------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2024 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import SIL
/// Prints the memory behavior of relevant instructions in relation to address values of the function.
let aliasInfoDumper = FunctionPass(name: "dump-alias-info") {
(function: Function, context: FunctionPassContext) in
let aliasAnalysis = context.aliasAnalysis
print("@\(function.name)")
let values = function.allValues
var pair = 0
for (index1, value1) in values.enumerated() {
for (index2, value2) in values.enumerated() {
if index2 >= index1 {
let result = aliasAnalysis.mayAlias(value1, value2)
precondition(result == aliasAnalysis.mayAlias(value2, value1), "alias analysis not symmetric")
print("PAIR #\(pair).")
print(" \(value1)")
print(" \(value2)")
if result {
print(" MayAlias")
} else if !value1.uses.isEmpty && !value2.uses.isEmpty {
print(" NoAlias")
} else {
print(" noalias?")
}
pair += 1
}
}
}
}
private extension Function {
var allValues: [Value] {
var values: [Value] = []
for block in blocks {
values.append(contentsOf: block.arguments.map { $0 })
for inst in block.instructions {
values.append(contentsOf: inst.results)
}
}
return values
}
}
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