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108 Commits

Author SHA1 Message Date
Artem Chikin
965ca698d5 Add in-source rationale for why Placeholder dependencies are needed. 2020-07-28 11:34:27 -07:00
Artem Chikin
746e89b252 Rename external dependencies to placeholder dependencies. 2020-07-27 09:24:36 -07:00
Artem Chikin
b5af62f93f Add new dependency kind (swiftExternal) to model external dependencies. 2020-07-27 09:24:35 -07:00
Xi Ge
056f00322d DependenciesScanner: refactor cross import overlay resolver to a standalone function. NFC 
This change facilitates resolving cross-import overlays from transitive dependencies.
 2020-07-23 17:47:47 -07:00
Saleem Abdulrasool
09975d1253 sprinkle llvm_unreachable for covered switches (NFC) 
Annotate the covered switches with `llvm_unreachable` to avoid the MSVC
warning which does not recognise the covered switches.  This allows us
to avoid a spew of warnings.
 2020-05-07 11:05:35 -07:00
Michael Forster
4852210fd5 More StringRef->std::string conversion fixes 2020-04-29 17:40:51 +02:00
Doug Gregor
d6484c8280 [Dependency scanning] Scan and record bridging header dependencies. 
When there is a bridging header associated with the module, scan and record
its dependencies. Note them in a separate structure to capture the specific
dependencies of the bridging header.
 2020-04-24 12:58:45 -07:00
Doug Gregor
33cdd61835 Fast dependency scanning for Swift 
Implement a new "fast" dependency scanning option,
`-scan-dependencies`, in the Swift frontend that determines all
of the source file and module dependencies for a given set of
Swift sources. It covers four forms of modules:

1) Swift (serialized) module files, by reading the module header
2) Swift interface files, by parsing the source code to find imports
3) Swift source modules, by parsing the source code to find imports
4) Clang modules, using Clang's fast dependency scanning tool

A single `-scan-dependencies` operation maps out the full
dependency graph for the given Swift source files, including all
of the Swift and Clang modules that may need to be built, such
that all of the work can be scheduled up front by the Swift
driver or any other build system that understands this
option. The dependency graph is emitted as JSON, which can be
consumed by these other tools.
 2020-04-24 12:58:41 -07:00