[ORC-RT] Make the ORC runtime C API public.

This is a first step towards allowing programs to pre-link against the ORC
runtime, which would allow us to move some code that is currently in the LLVM
OrcTarget library into the ORC runtime instead.

The C API header has limited utility as-is, but serves as a minimal first step
and provides clients with tools for interacting with wrapper functions.

Reviewed By: beanz

Differential Revision: https://reviews.llvm.org/D127324

compiler-rt/include/CMakeLists.txt

@@ -35,6 +35,12 @@ if (COMPILER_RT_BUILD_XRAY)
     )
 endif(COMPILER_RT_BUILD_XRAY)
 
+if (COMPILER_RT_BUILD_ORC)
+  set(ORC_HEADERS
+    orc/c_api.h
+    )
+endif(COMPILER_RT_BUILD_ORC)
+
 if (COMPILER_RT_BUILD_PROFILE)
   set(PROFILE_HEADERS
     profile/InstrProfData.inc
@@ -46,6 +52,7 @@ set(COMPILER_RT_HEADERS
   ${FUZZER_HEADERS}
   ${MEMPROF_HEADERS}
   ${XRAY_HEADERS}
+  ${ORC_HEADERS}
   ${PROFILE_HEADERS})
 
 set(output_dir ${COMPILER_RT_OUTPUT_DIR}/include)
@@ -81,6 +88,11 @@ install(FILES ${XRAY_HEADERS}
   COMPONENT compiler-rt-headers
   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
   DESTINATION ${COMPILER_RT_INSTALL_INCLUDE_DIR}/xray)
+# Install ORC headers.
+install(FILES ${ORC_HEADERS}
+  COMPONENT compiler-rt-headers
+  PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+  DESTINATION ${COMPILER_RT_INSTALL_INCLUDE_DIR}/orc)
 # Install profile headers.
 install(FILES ${PROFILE_HEADERS}
   COMPONENT compiler-rt-headers

compiler-rt/lib/orc/common.h

@@ -13,8 +13,8 @@
 #ifndef ORC_RT_COMMON_H
 #define ORC_RT_COMMON_H
 
-#include "c_api.h"
 #include "compiler.h"
+#include "orc/c_api.h"
 #include <type_traits>
 
 /// This macro should be used to define tags that will be associated with

compiler-rt/lib/orc/macho_ehframe_registration.cpp

@@ -11,9 +11,9 @@
 //===----------------------------------------------------------------------===//
 
 #include "adt.h"
-#include "c_api.h"
 #include "common.h"
 #include "executor_address.h"
+#include "orc/c_api.h"
 #include "wrapper_function_utils.h"
 
 using namespace __orc_rt;

compiler-rt/lib/orc/unittests/CMakeLists.txt

@@ -68,7 +68,7 @@ macro(add_orc_unittest testname)
         OrcRTUnitTests "${testname}-${arch}-Test" "${arch}"
         SOURCES ${TEST_SOURCES} ${COMPILER_RT_GTEST_SOURCE}
         RUNTIME "${ORC_RUNTIME_LIBS}"
-        COMPILE_DEPS ${TEST_HEADERS}
+        COMPILE_DEPS ${TEST_HEADERS} ${ORC_HEADERS}
         DEPS ${ORC_DEPS}
         CFLAGS ${ORC_UNITTEST_CFLAGS}
         LINK_FLAGS ${ORC_UNITTEST_LINK_FLAGS})

compiler-rt/lib/orc/unittests/c_api_test.cpp

@@ -10,7 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "c_api.h"
+#include "orc/c_api.h"
 #include "gtest/gtest.h"
 
 TEST(CAPITest, CWrapperFunctionResultInit) {

compiler-rt/lib/orc/wrapper_function_utils.h

@@ -13,7 +13,7 @@
 #ifndef ORC_RT_WRAPPER_FUNCTION_UTILS_H
 #define ORC_RT_WRAPPER_FUNCTION_UTILS_H
 
-#include "c_api.h"
+#include "orc/c_api.h"
 #include "common.h"
 #include "error.h"
 #include "executor_address.h"