[Support] Add clang tooling generated explicit visibility macros

These will be needed to export symbols from llvm shared library on windows without
 having to export every symbol and running in to the 64k symbol limit of DLLs.

This is part of the work to enable LLVM_BUILD_LLVM_DYLIB and LLVM plugins on window.

Author: fsfod

llvm/include/llvm/Support/AMDGPUMetadata.h

@@ -16,6 +16,7 @@
 #define LLVM_SUPPORT_AMDGPUMETADATA_H
 
 #include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Compiler.h"
 #include <cstdint>
 #include <string>
 #include <system_error>
@@ -447,10 +448,10 @@ struct Metadata final {
 };
 
 /// Converts \p String to \p HSAMetadata.
-std::error_code fromString(StringRef String, Metadata &HSAMetadata);
+LLVM_ABI std::error_code fromString(StringRef String, Metadata &HSAMetadata);
 
 /// Converts \p HSAMetadata to \p String.
-std::error_code toString(Metadata HSAMetadata, std::string &String);
+LLVM_ABI std::error_code toString(Metadata HSAMetadata, std::string &String);
 
 //===----------------------------------------------------------------------===//
 // HSA metadata for v3 code object.

llvm/include/llvm/Support/ARMAttributeParser.h

@@ -12,13 +12,14 @@
 #include "ARMBuildAttributes.h"
 #include "ELFAttributeParser.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/Error.h"
 
 namespace llvm {
 
 class ScopedPrinter;
 
-class ARMAttributeParser : public ELFAttributeParser {
+class LLVM_ABI ARMAttributeParser : public ELFAttributeParser {
   struct DisplayHandler {
     ARMBuildAttrs::AttrType attribute;
     Error (ARMAttributeParser::*routine)(ARMBuildAttrs::AttrType);

llvm/include/llvm/Support/ARMBuildAttributes.h

@@ -18,12 +18,13 @@
 #ifndef LLVM_SUPPORT_ARMBUILDATTRIBUTES_H
 #define LLVM_SUPPORT_ARMBUILDATTRIBUTES_H
 
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/ELFAttributes.h"
 
 namespace llvm {
 namespace ARMBuildAttrs {
 
-const TagNameMap &getARMAttributeTags();
+LLVM_ABI const TagNameMap &getARMAttributeTags();
 
 enum SpecialAttr {
   // This is for the .cpu asm attr. It translates into one or more

llvm/include/llvm/Support/ARMWinEH.h

@@ -10,6 +10,7 @@
 #define LLVM_SUPPORT_ARMWINEH_H
 
 #include "llvm/ADT/ArrayRef.h"
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/Endian.h"
 
 namespace llvm {
@@ -205,7 +206,7 @@ inline uint16_t StackAdjustment(const RuntimeFunction &RF) {
 
 /// SavedRegisterMask - Utility function to calculate the set of saved general
 /// purpose (r0-r15) and VFP (d0-d31) registers.
-std::pair<uint16_t, uint32_t> SavedRegisterMask(const RuntimeFunction &RF,
+LLVM_ABI std::pair<uint16_t, uint32_t> SavedRegisterMask(const RuntimeFunction &RF,
                                                 bool Prologue = true);
 
 /// RuntimeFunctionARM64 - An entry in the table of procedure data (.pdata)

llvm/include/llvm/Support/Allocator.h

@@ -36,7 +36,7 @@ namespace detail {
 
 // We call out to an external function to actually print the message as the
 // printing code uses Allocator.h in its implementation.
-void printBumpPtrAllocatorStats(unsigned NumSlabs, size_t BytesAllocated,
+LLVM_ABI void printBumpPtrAllocatorStats(unsigned NumSlabs, size_t BytesAllocated,
                                 size_t TotalMemory);
 
 } // end namespace detail

llvm/include/llvm/Support/Atomic.h

@@ -17,6 +17,7 @@
 #ifndef LLVM_SUPPORT_ATOMIC_H
 #define LLVM_SUPPORT_ATOMIC_H
 
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/DataTypes.h"
 
 // Windows will at times define MemoryFence.
@@ -26,14 +27,14 @@
 
 namespace llvm {
   namespace sys {
-    void MemoryFence();
+    LLVM_ABI void MemoryFence();
 
 #ifdef _MSC_VER
     typedef long cas_flag;
 #else
     typedef uint32_t cas_flag;
 #endif
-    cas_flag CompareAndSwap(volatile cas_flag* ptr,
+    LLVM_ABI cas_flag CompareAndSwap(volatile cas_flag* ptr,
                             cas_flag new_value,
                             cas_flag old_value);
   }

llvm/include/llvm/Support/BalancedPartitioning.h

@@ -41,6 +41,7 @@
 
 #include "raw_ostream.h"
 #include "llvm/ADT/ArrayRef.h"
+#include "llvm/Support/Compiler.h"
 
 #include <atomic>
 #include <condition_variable>
@@ -53,7 +54,7 @@ namespace llvm {
 class ThreadPoolInterface;
 /// A function with a set of utility nodes where it is beneficial to order two
 /// functions close together if they have similar utility nodes
-class BPFunctionNode {
+class LLVM_ABI BPFunctionNode {
   friend class BalancedPartitioning;
 
 public:
@@ -97,7 +98,7 @@ struct BalancedPartitioningConfig {
   unsigned TaskSplitDepth = 9;
 };
 
-class BalancedPartitioning {
+class LLVM_ABI BalancedPartitioning {
 public:
   BalancedPartitioning(const BalancedPartitioningConfig &Config);
 
@@ -114,7 +115,7 @@ class BalancedPartitioning {
   /// wait(). BalancedPartitioning recursively spawns new threads inside other
   /// threads, so we need to track how many active threads that could spawn more
   /// threads.
-  struct BPThreadPool {
+  struct LLVM_ABI BPThreadPool {
     ThreadPoolInterface &TheThreadPool;
     std::mutex mtx;
     std::condition_variable cv;

llvm/include/llvm/Support/Base64.h

@@ -13,6 +13,7 @@
 #ifndef LLVM_SUPPORT_BASE64_H
 #define LLVM_SUPPORT_BASE64_H
 
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/Error.h"
 #include <cstdint>
 #include <string>
@@ -54,7 +55,7 @@ template <class InputBytes> std::string encodeBase64(InputBytes const &Bytes) {
   return Buffer;
 }
 
-llvm::Error decodeBase64(llvm::StringRef Input, std::vector<char> &Output);
+LLVM_ABI llvm::Error decodeBase64(llvm::StringRef Input, std::vector<char> &Output);
 
 } // end namespace llvm
 

llvm/include/llvm/Support/BinaryStream.h

@@ -12,6 +12,7 @@
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/BitmaskEnum.h"
 #include "llvm/Support/BinaryStreamError.h"
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/Error.h"
 #include <cstdint>
 
@@ -31,7 +32,7 @@ enum BinaryStreamFlags {
 /// single contiguous buffer (or even in memory at all), in such cases a it may
 /// be necessary for an implementation to cache such a buffer so that it can
 /// return it.
-class BinaryStream {
+class LLVM_ABI BinaryStream {
 public:
   virtual ~BinaryStream() = default;
 
@@ -69,7 +70,7 @@ class BinaryStream {
 /// buffer to the stream's backing store.  Streams are assumed to be buffered
 /// so that to be portable it is necessary to call commit() on the stream when
 /// all data has been written.
-class WritableBinaryStream : public BinaryStream {
+class LLVM_ABI WritableBinaryStream : public BinaryStream {
 public:
   ~WritableBinaryStream() override = default;
 

llvm/include/llvm/Support/BinaryStreamError.h

@@ -10,6 +10,7 @@
 #define LLVM_SUPPORT_BINARYSTREAMERROR_H
 
 #include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/Error.h"
 
 #include <string>
@@ -24,7 +25,7 @@ enum class stream_error_code {
 };
 
 /// Base class for errors originating when parsing raw PDB files
-class BinaryStreamError : public ErrorInfo<BinaryStreamError> {
+class LLVM_ABI BinaryStreamError : public ErrorInfo<BinaryStreamError> {
 public:
   static char ID;
   explicit BinaryStreamError(stream_error_code C);