[5.7-04182022][SwiftCompiler/Regex] Use bridged DiagnosticEngine for error reporting #58509
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This fixes: * An issue where the diagnostic messages were leaked * Diagnose at correct position inside the regex literal To do this: * Introduce 'Parse' SwiftCompiler module that is a bridging layer between '_CompilerRegexParser' and C++ libParse * Move libswiftParseRegexLiteral and libswiftLexRegexLiteral to 'Parse' Also this change makes 'SwiftCompilerSources/Package.swift' be configured by CMake so it can actually be built with 'swift-build'. rdar://92187284 (cherry picked from commit d292a95) (cherry picked from commit cec31b5)
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Cherry-pick #58390 into
release/5.7-04182022This requires swiftlang/swift-experimental-string-processing#369
SwiftCompilerModuleswritten in Swift. Previously, lexing/parsing error reporting was done by passing back a pointer to a C-string that is allocated in heap memory, and was never deallocated (leak). Also previously, since the error message didn't have the source location information, the diagnostic used to always point the start of the literal, that was confusing. In this change, utilize the bridgedDiagnosticEngineso we don't need to allocate C-string, and use the correct source location to diagnoseDiagnosticEngineto Swift. That said, it's just a pointer to C++DiagnosticEngine, and the actual diagnostic emitting logic is not new. So the risk it not too high.