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Saleem Abdulrasool 81a650ee87 Driver,CodeGen: introduce support for Swift CFString layout 
Add a new driver level flag `-fcf-runtime-abi=` that allows one to specify the
runtime ABI for CoreFoundation.  This controls the language interoperability.
In particular, this is relevant for generating the CFConstantString classes
(primarily through the `__builtin___CFStringMakeConstantString` builtin) which
construct a reference to the "CFObject"'s `isa` field.  This type differs
between swift 4.1 and 4.2+.

Valid values for the new option include:
  - objc [default behaviour] - enable ObjectiveC interoperability
  - swift-4.1 - enable interoperability with swift 4.1
  - swift-4.2 - enable interoperability with swift 4.2
  - swift-5.0 - enable interoperability with swift 5.0
  - swift [alias] - target the latest swift ABI

Furthermore, swift 4.2+ changed the layout for the CFString when building
CoreFoundation *without* ObjectiveC interoperability.  In such a case, a field
was added to the CFObject base type changing it from: <{ const int*, int }> to
<{ uintptr_t, uintptr_t, uint64_t }>.

In swift 5.0, the CFString type will be further adjusted to change the length
from a uint32_t on everything but BE LP64 targets to uint64_t.

Note that the default behaviour for clang remains unchanged and the new layout
must be explicitly opted into via `-fcf-runtime-abi=swift*`.

llvm-svn: 345222
 		2018-10-24 23:28:28 +00:00
clang Driver,CodeGen: introduce support for Swift CFString layout 2018-10-24 23:28:28 +00:00
clang-tools-extra [clang-query] Refactor Output settings to booleans 2018-10-24 20:33:55 +00:00
compiler-rt [sanitizer] Avoid calling a nullptr in MonotonicNanoTime if interceptors are not yet initialized 2018-10-24 18:40:08 +00:00
debuginfo-tests Revert "(Retry) Add a basic integration test for C++ smart pointers" 2018-08-20 19:53:33 +00:00
libclc configure: Rework support for gfx9+ devices that were added post LLVM 3.9 2018-09-15 22:02:01 +00:00
libcxx Implement sized deallocation for std::allocator and friends. 2018-10-24 22:44:01 +00:00
libcxxabi cxa_demangle: make demangler's parsing functions overridable 2018-10-16 14:29:14 +00:00
libunwind [CMake] Link to compiler-rt if LIBUNWIND_USE_COMPILER_RT is ON. 2018-10-08 18:35:00 +00:00
lld Do not call computeIsPreemptible() if its result is discarded. NFC. 2018-10-24 22:15:32 +00:00
lldb [Settings] Add -force flag to "settings set" 2018-10-24 22:04:20 +00:00
llgo Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
llvm [WebAssembly] Retain shuffle types during custom lowering 2018-10-24 23:27:40 +00:00
openmp [OpenMP] Convert KMP_DYNAMIC_LIB to a 0 or 1 guard everywhere 2018-10-05 17:59:39 +00:00
parallel-libs Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
polly [TI removal] Generically discuss terminators rather than use the soon to 2018-10-18 07:43:30 +00:00
README.md Update the project name in README.md 2018-10-19 00:03:01 +00:00

README.md

The LLVM Compiler Infrastructure

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.