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DependencyGraphBuilder.swift
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DependencyGraphBuilder.swift
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//===--- DependencyGraphBuilder.swift -------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2020 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
//
//===----------------------------------------------------------------------===//
@_implementationOnly import CSwiftScan
internal extension SwiftScan {
/// From a reference to a binary-format dependency graph returned by libSwiftScan,
/// construct an instance of an `InterModuleDependencyGraph`.
func constructGraph(from scannerGraphRef: swiftscan_dependency_graph_t,
moduleAliases: [String: String]?) throws
-> InterModuleDependencyGraph {
let mainModuleNameRef =
api.swiftscan_dependency_graph_get_main_module_name(scannerGraphRef)
let mainModuleName = try toSwiftString(mainModuleNameRef)
let dependencySetRefOrNull = api.swiftscan_dependency_graph_get_dependencies(scannerGraphRef)
guard let dependencySetRef = dependencySetRefOrNull else {
throw DependencyScanningError.missingField("dependency_graph.dependencies")
}
var resultGraph = InterModuleDependencyGraph(mainModuleName: mainModuleName)
// Turn the `swiftscan_dependency_set_t` into an array of `swiftscan_dependency_info_t`
// references we can iterate through in order to construct `ModuleInfo` objects.
let moduleRefArray = Array(UnsafeBufferPointer(start: dependencySetRef.pointee.modules,
count: Int(dependencySetRef.pointee.count)))
for moduleRefOrNull in moduleRefArray {
guard let moduleRef = moduleRefOrNull else {
throw DependencyScanningError.missingField("dependency_set_t.modules[_]")
}
let (moduleId, moduleInfo) = try constructModuleInfo(from: moduleRef, moduleAliases: moduleAliases)
resultGraph.modules[moduleId] = moduleInfo
}
return resultGraph
}
/// From a reference to a binary-format set of module imports return by libSwiftScan pre-scan query,
/// construct an instance of an `InterModuleDependencyImports` set
func constructImportSet(from importSetRef: swiftscan_import_set_t,
with moduleAliases: [String: String]?) throws
-> InterModuleDependencyImports {
guard let importsRef = api.swiftscan_import_set_get_imports(importSetRef) else {
throw DependencyScanningError.missingField("import_set.imports")
}
return InterModuleDependencyImports(imports: try toSwiftStringArray(importsRef.pointee), moduleAliases: moduleAliases)
}
/// From a reference to a binary-format dependency graph collection returned by libSwiftScan batch scan query,
/// corresponding to the specified batch scan input (`BatchScanModuleInfo`), construct instances of
/// `InterModuleDependencyGraph` for each result.
func constructBatchResultGraphs(for batchInfos: [BatchScanModuleInfo],
moduleAliases: [String: String]?,
from batchResultRef: swiftscan_batch_scan_result_t) throws
-> [ModuleDependencyId: [InterModuleDependencyGraph]] {
var resultMap: [ModuleDependencyId: [InterModuleDependencyGraph]] = [:]
let resultGraphRefArray = Array(UnsafeBufferPointer(start: batchResultRef.results,
count: Int(batchResultRef.count)))
// Note, respective indices of the batch scan input and the returned result must be aligned.
for (index, resultGraphRefOrNull) in resultGraphRefArray.enumerated() {
guard let resultGraphRef = resultGraphRefOrNull else {
throw DependencyScanningError.dependencyScanFailed
}
let decodedGraph = try constructGraph(from: resultGraphRef, moduleAliases: moduleAliases)
let moduleId: ModuleDependencyId
switch batchInfos[index] {
case .swift(let swiftModuleBatchScanInfo):
moduleId = .swift(swiftModuleBatchScanInfo.swiftModuleName)
case .clang(let clangModuleBatchScanInfo):
moduleId = .clang(clangModuleBatchScanInfo.clangModuleName)
}
// Update the map with either yet another graph or create an entry for this module
if resultMap[moduleId] != nil {
resultMap[moduleId]!.append(decodedGraph)
} else {
resultMap[moduleId] = [decodedGraph]
}
}
return resultMap
}
}
private extension SwiftScan {
/// From a reference to a binary-format module dependency module info returned by libSwiftScan,
/// construct an instance of an `ModuleInfo` as used by the driver
func constructModuleInfo(from moduleInfoRef: swiftscan_dependency_info_t,
moduleAliases: [String: String]?)
throws -> (ModuleDependencyId, ModuleInfo) {
// Decode the module name and module kind
let encodedModuleName =
try toSwiftString(api.swiftscan_module_info_get_module_name(moduleInfoRef))
let moduleId = try decodeModuleNameAndKind(from: encodedModuleName, moduleAliases: moduleAliases)
// Decode module path and source file locations
let modulePathStr = try toSwiftString(api.swiftscan_module_info_get_module_path(moduleInfoRef))
let modulePath = TextualVirtualPath(path: try VirtualPath.intern(path: modulePathStr))
let sourceFiles: [String]?
if let sourceFilesSetRef = api.swiftscan_module_info_get_source_files(moduleInfoRef) {
sourceFiles = try toSwiftStringArray(sourceFilesSetRef.pointee)
} else {
sourceFiles = nil
}
// Decode all dependencies of this module
let directDependencies: [ModuleDependencyId]?
if let encodedDirectDepsRef = api.swiftscan_module_info_get_direct_dependencies(moduleInfoRef) {
let encodedDirectDependencies = try toSwiftStringArray(encodedDirectDepsRef.pointee)
directDependencies =
try encodedDirectDependencies.map { try decodeModuleNameAndKind(from: $0, moduleAliases: moduleAliases) }
} else {
directDependencies = nil
}
guard let moduleDetailsRef = api.swiftscan_module_info_get_details(moduleInfoRef) else {
throw DependencyScanningError.missingField("modules[\(moduleId)].details")
}
let details = try constructModuleDetails(from: moduleDetailsRef,
moduleAliases: moduleAliases)
return (moduleId, ModuleInfo(modulePath: modulePath, sourceFiles: sourceFiles,
directDependencies: directDependencies,
details: details))
}
/// From a reference to a binary-format module info details object info returned by libSwiftScan,
/// construct an instance of an `ModuleInfo`.Details as used by the driver.
/// The object returned by libSwiftScan is a union so ensure to execute dependency-specific queries.
func constructModuleDetails(from moduleDetailsRef: swiftscan_module_details_t,
moduleAliases: [String: String]?)
throws -> ModuleInfo.Details {
let moduleKind = api.swiftscan_module_detail_get_kind(moduleDetailsRef)
switch moduleKind {
case SWIFTSCAN_DEPENDENCY_INFO_SWIFT_TEXTUAL:
return .swift(try constructSwiftTextualModuleDetails(from: moduleDetailsRef,
moduleAliases: moduleAliases))
case SWIFTSCAN_DEPENDENCY_INFO_SWIFT_BINARY:
return .swiftPrebuiltExternal(try constructSwiftBinaryModuleDetails(from: moduleDetailsRef))
case SWIFTSCAN_DEPENDENCY_INFO_SWIFT_PLACEHOLDER:
return .swiftPlaceholder(try constructPlaceholderModuleDetails(from: moduleDetailsRef))
case SWIFTSCAN_DEPENDENCY_INFO_CLANG:
return .clang(try constructClangModuleDetails(from: moduleDetailsRef))
default:
throw DependencyScanningError.unsupportedDependencyDetailsKind(Int(moduleKind.rawValue))
}
}
/// Construct a `SwiftModuleDetails` from a `swiftscan_module_details_t` reference
func constructSwiftTextualModuleDetails(from moduleDetailsRef: swiftscan_module_details_t,
moduleAliases: [String: String]?)
throws -> SwiftModuleDetails {
let moduleInterfacePath =
try getOptionalPathDetail(from: moduleDetailsRef,
using: api.swiftscan_swift_textual_detail_get_module_interface_path)
let compiledModuleCandidates =
try getOptionalPathArrayDetail(from: moduleDetailsRef,
using: api.swiftscan_swift_textual_detail_get_compiled_module_candidates)
let bridgingHeaderPath =
try getOptionalPathDetail(from: moduleDetailsRef,
using: api.swiftscan_swift_textual_detail_get_bridging_header_path)
let bridgingSourceFiles =
try getOptionalPathArrayDetail(from: moduleDetailsRef,
using: api.swiftscan_swift_textual_detail_get_bridging_source_files)
let bridgingHeaderDependencies =
try getOptionalStringArrayDetail(from: moduleDetailsRef,
using: api.swiftscan_swift_textual_detail_get_bridging_module_dependencies)
let bridgingHeader: BridgingHeader?
if let resolvedBridgingHeaderPath = bridgingHeaderPath {
bridgingHeader = BridgingHeader(path: resolvedBridgingHeaderPath,
sourceFiles: bridgingSourceFiles ?? [],
moduleDependencies: bridgingHeaderDependencies ?? [])
} else {
bridgingHeader = nil
}
let commandLine =
try getOptionalStringArrayDetail(from: moduleDetailsRef,
using: api.swiftscan_swift_textual_detail_get_command_line)
let extraPcmArgs =
try getStringArrayDetail(from: moduleDetailsRef,
using: api.swiftscan_swift_textual_detail_get_extra_pcm_args,
fieldName: "extraPCMArgs")
let contextHash =
try getOptionalStringDetail(from: moduleDetailsRef,
using: api.swiftscan_swift_textual_detail_get_context_hash)
let isFramework = api.swiftscan_swift_textual_detail_get_is_framework(moduleDetailsRef)
// Decode all dependencies of this module
let swiftOverlayDependencies: [ModuleDependencyId]?
if supportsSeparateSwiftOverlayDependencies(),
let encodedOverlayDepsRef = api.swiftscan_swift_textual_detail_get_swift_overlay_dependencies(moduleDetailsRef) {
let encodedOverlayDependencies = try toSwiftStringArray(encodedOverlayDepsRef.pointee)
swiftOverlayDependencies =
try encodedOverlayDependencies.map { try decodeModuleNameAndKind(from: $0, moduleAliases: moduleAliases) }
} else {
swiftOverlayDependencies = nil
}
return SwiftModuleDetails(moduleInterfacePath: moduleInterfacePath,
compiledModuleCandidates: compiledModuleCandidates,
bridgingHeader: bridgingHeader,
commandLine: commandLine,
contextHash: contextHash,
extraPcmArgs: extraPcmArgs,
isFramework: isFramework,
swiftOverlayDependencies: swiftOverlayDependencies)
}
/// Construct a `SwiftPrebuiltExternalModuleDetails` from a `swiftscan_module_details_t` reference
func constructSwiftBinaryModuleDetails(from moduleDetailsRef: swiftscan_module_details_t)
throws -> SwiftPrebuiltExternalModuleDetails {
let compiledModulePath =
try getPathDetail(from: moduleDetailsRef,
using: api.swiftscan_swift_binary_detail_get_compiled_module_path,
fieldName: "swift_binary_detail.compiledModulePath")
let moduleDocPath =
try getOptionalPathDetail(from: moduleDetailsRef,
using: api.swiftscan_swift_binary_detail_get_module_doc_path)
let moduleSourceInfoPath =
try getOptionalPathDetail(from: moduleDetailsRef,
using: api.swiftscan_swift_binary_detail_get_module_source_info_path)
let isFramework: Bool
if hasBinarySwiftModuleIsFramework {
isFramework = api.swiftscan_swift_binary_detail_get_is_framework(moduleDetailsRef)
} else {
isFramework = false
}
return try SwiftPrebuiltExternalModuleDetails(compiledModulePath: compiledModulePath,
moduleDocPath: moduleDocPath,
moduleSourceInfoPath: moduleSourceInfoPath,
isFramework: isFramework)
}
/// Construct a `SwiftPlaceholderModuleDetails` from a `swiftscan_module_details_t` reference
func constructPlaceholderModuleDetails(from moduleDetailsRef: swiftscan_module_details_t)
throws -> SwiftPlaceholderModuleDetails {
let moduleDocPath =
try getOptionalPathDetail(from: moduleDetailsRef,
using: api.swiftscan_swift_placeholder_detail_get_module_doc_path)
let moduleSourceInfoPath =
try getOptionalPathDetail(from: moduleDetailsRef,
using: api.swiftscan_swift_placeholder_detail_get_module_source_info_path)
return SwiftPlaceholderModuleDetails(moduleDocPath: moduleDocPath,
moduleSourceInfoPath: moduleSourceInfoPath)
}
/// Construct a `ClangModuleDetails` from a `swiftscan_module_details_t` reference
func constructClangModuleDetails(from moduleDetailsRef: swiftscan_module_details_t)
throws -> ClangModuleDetails {
let moduleMapPath =
try getPathDetail(from: moduleDetailsRef,
using: api.swiftscan_clang_detail_get_module_map_path,
fieldName: "clang_detail.moduleMapPath")
let contextHash =
try getStringDetail(from: moduleDetailsRef,
using: api.swiftscan_clang_detail_get_context_hash,
fieldName: "clang_detail.contextHash")
let commandLine =
try getStringArrayDetail(from: moduleDetailsRef,
using: api.swiftscan_clang_detail_get_command_line,
fieldName: "clang_detail.commandLine")
let capturedPCMArgs : Set<[String]>?
if clangDetailsHaveCapturedPCMArgs {
let capturedArgs = try getStringArrayDetail(from: moduleDetailsRef,
using: api.swiftscan_clang_detail_get_captured_pcm_args,
fieldName: "clang_detail.capturedPCMArgs")
capturedPCMArgs = [capturedArgs]
} else {
capturedPCMArgs = nil
}
return ClangModuleDetails(moduleMapPath: moduleMapPath,
contextHash: contextHash,
commandLine: commandLine,
capturedPCMArgs: capturedPCMArgs)
}
}
internal extension SwiftScan {
/// Convert a `swiftscan_string_ref_t` reference to a Swift `String`, assuming the reference is to a valid string
/// (non-null)
func toSwiftString(_ string_ref: swiftscan_string_ref_t) throws -> String {
if string_ref.length == 0 {
return ""
}
// If the string is of a positive length, the pointer cannot be null
guard let dataPtr = string_ref.data else {
throw DependencyScanningError.invalidStringPtr
}
return String(bytesNoCopy: UnsafeMutableRawPointer(mutating: dataPtr),
length: string_ref.length,
encoding: String.Encoding.utf8, freeWhenDone: false)!
}
/// Convert a `swiftscan_string_set_t` reference to a Swift `[String]`, assuming the individual string references
/// are to a valid strings (non-null)
func toSwiftStringArray(_ string_set: swiftscan_string_set_t) throws -> [String] {
var result: [String] = []
let stringRefArray = Array(UnsafeBufferPointer(start: string_set.strings,
count: Int(string_set.count)))
for stringRef in stringRefArray {
result.append(try toSwiftString(stringRef))
}
return result
}
/// Convert a `swiftscan_string_set_t` reference to a Swift `Set<String>`, assuming the individual string references
/// are to a valid strings (non-null)
func toSwiftStringSet(_ string_set: swiftscan_string_set_t) throws -> Set<String> {
var result = Set<String>()
let stringRefArray = Array(UnsafeBufferPointer(start: string_set.strings,
count: Int(string_set.count)))
for stringRef in stringRefArray {
result.insert(try toSwiftString(stringRef))
}
return result
}
}
private extension SwiftScan {
/// From a `swiftscan_module_details_t` reference, extract a `TextualVirtualPath?` detail using the specified API query
func getOptionalPathDetail(from detailsRef: swiftscan_module_details_t,
using query: (swiftscan_module_details_t)
-> swiftscan_string_ref_t)
throws -> TextualVirtualPath? {
let strDetail = try getOptionalStringDetail(from: detailsRef, using: query)
return strDetail != nil ? TextualVirtualPath(path: try VirtualPath.intern(path: strDetail!)) : nil
}
/// From a `swiftscan_module_details_t` reference, extract a `String?` detail using the specified API query
func getOptionalStringDetail(from detailsRef: swiftscan_module_details_t,
using query: (swiftscan_module_details_t)
-> swiftscan_string_ref_t)
throws -> String? {
let detailRef = query(detailsRef)
guard detailRef.length != 0 else { return nil }
assert(detailRef.data != nil)
return try toSwiftString(detailRef)
}
/// From a `swiftscan_module_details_t` reference, extract a `TextualVirtualPath` detail using the specified API
/// query, making sure the reference is to a non-null (and non-empty) path.
func getPathDetail(from detailsRef: swiftscan_module_details_t,
using query: (swiftscan_module_details_t) -> swiftscan_string_ref_t,
fieldName: String)
throws -> TextualVirtualPath {
let strDetail = try getStringDetail(from: detailsRef, using: query, fieldName: fieldName)
return TextualVirtualPath(path: try VirtualPath.intern(path: strDetail))
}
/// From a `swiftscan_module_details_t` reference, extract a `String` detail using the specified API query,
/// making sure the reference is to a non-null (and non-empty) string.
func getStringDetail(from detailsRef: swiftscan_module_details_t,
using query: (swiftscan_module_details_t) -> swiftscan_string_ref_t,
fieldName: String) throws -> String {
guard let result = try getOptionalStringDetail(from: detailsRef, using: query) else {
throw DependencyScanningError.missingField(fieldName)
}
return result
}
/// From a `swiftscan_module_details_t` reference, extract a `[TextualVirtualPath]?` detail using the specified API
/// query
func getOptionalPathArrayDetail(from detailsRef: swiftscan_module_details_t,
using query: (swiftscan_module_details_t)
-> UnsafeMutablePointer<swiftscan_string_set_t>?)
throws -> [TextualVirtualPath]? {
guard let strArrDetail = try getOptionalStringArrayDetail(from: detailsRef, using: query) else {
return nil
}
return try strArrDetail.map { TextualVirtualPath(path: try VirtualPath.intern(path: $0)) }
}
/// From a `swiftscan_module_details_t` reference, extract a `[String]?` detail using the specified API query
func getOptionalStringArrayDetail(from detailsRef: swiftscan_module_details_t,
using query: (swiftscan_module_details_t)
-> UnsafeMutablePointer<swiftscan_string_set_t>?)
throws -> [String]? {
guard let detailRef = query(detailsRef) else { return nil }
return try toSwiftStringArray(detailRef.pointee)
}
/// From a `swiftscan_module_details_t` reference, extract a `[String]` detail using the specified API query,
/// making sure individual string references are non-null (and non-empty) strings.
func getStringArrayDetail(from detailsRef: swiftscan_module_details_t,
using query: (swiftscan_module_details_t)
-> UnsafeMutablePointer<swiftscan_string_set_t>?,
fieldName: String) throws -> [String] {
guard let result = try getOptionalStringArrayDetail(from: detailsRef, using: query) else {
throw DependencyScanningError.missingField(fieldName)
}
return result
}
}
private extension SwiftScan {
/// Decode the module name returned by libSwiftScan into a `ModuleDependencyId`
/// libSwiftScan encodes the module's name using the following scheme:
/// `<module-kind>:<module-name>`
/// where `module-kind` is one of:
/// "swiftTextual"
/// "swiftBinary"
/// "swiftPlaceholder"
/// "clang""
func decodeModuleNameAndKind(from encodedName: String,
moduleAliases: [String: String]?) throws -> ModuleDependencyId {
switch encodedName {
case _ where encodedName.starts(with: "swiftTextual:"):
var namePart = String(encodedName.suffix(encodedName.count - "swiftTextual:".count))
if let moduleAliases = moduleAliases, let realName = moduleAliases[namePart] {
namePart = realName
}
return .swift(namePart)
case _ where encodedName.starts(with: "swiftBinary:"):
var namePart = String(encodedName.suffix(encodedName.count - "swiftBinary:".count))
if let moduleAliases = moduleAliases, let realName = moduleAliases[namePart] {
namePart = realName
}
return .swiftPrebuiltExternal(namePart)
case _ where encodedName.starts(with: "swiftPlaceholder:"):
return .swiftPlaceholder(String(encodedName.suffix(encodedName.count - "swiftPlaceholder:".count)))
case _ where encodedName.starts(with: "clang:"):
return .clang(String(encodedName.suffix(encodedName.count - "clang:".count)))
default:
throw DependencyScanningError.moduleNameDecodeFailure(encodedName)
}
}
}