[llvm] annotate interfaces in llvm/Support for DLL export (#136014)

## Purpose

This patch is one in a series of code-mods that annotate LLVM’s public
interface for export. This patch annotates the `llvm/Support` library.
These annotations currently have no meaningful impact on the LLVM build;
however, they are a prerequisite to support an LLVM Windows DLL (shared
library) build.

## Background

This effort is tracked in #109483. Additional context is provided in
[this
discourse](https://discourse.llvm.org/t/psa-annotating-llvm-public-interface/85307),
and documentation for `LLVM_ABI` and related annotations is found in the
LLVM repo
[here](https://github.com/llvm/llvm-project/blob/main/llvm/docs/InterfaceExportAnnotations.rst).

The bulk of these changes were generated automatically using the
[Interface Definition Scanner (IDS)](https://github.com/compnerd/ids)
tool, followed formatting with `git clang-format`.

The following manual adjustments were also applied after running IDS on
Linux:
- Add `#include "llvm/Support/Compiler.h"` to files where it was not
auto-added by IDS due to no pre-existing block of include statements.
- Add `LLVM_ABI` to Windows-only code (auto generated with IDS on
Windows)
- Explicitly make classes non-copyable where needed to due IDS adding
`LLVM_ABI` at the class level
- Add `LLVM_TEMPLATE_ABI` and `LLVM_EXPORT_TEMPLATE` to exported
instantiated templates
- Add `LLVM_ABI_FRIEND` to a small number of `friend` function
declarations
- Add `LLVM_ABI` to a subset of private class methods and fields that
require export
- Add `LLVM_ABI` to a small number of symbols that require export but
are not declared in headers
- Add `LLVM_ABI` functions defined via X-macro

## Validation

Local builds and tests to validate cross-platform compatibility. This
included llvm, clang, and lldb on the following configurations:

- Windows with MSVC
- Windows with Clang
- Linux with GCC
- Linux with Clang
- Darwin with Clang

Author: andrurogerz

llvm/include/llvm/Support/AArch64AttributeParser.h

@@ -9,13 +9,14 @@
 #ifndef LLVM_SUPPORT_AARCH64ATTRIBUTEPARSER_H
 #define LLVM_SUPPORT_AARCH64ATTRIBUTEPARSER_H
 
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/ELFAttrParserExtended.h"
 #include "llvm/Support/ELFAttributes.h"
 
 namespace llvm {
 
 class AArch64AttributeParser : public ELFExtendedAttrParser {
-  static std::vector<SubsectionAndTagToTagName> &returnTagsNamesMap();
+  LLVM_ABI static std::vector<SubsectionAndTagToTagName> &returnTagsNamesMap();
 
 public:
   AArch64AttributeParser(ScopedPrinter *Sw)

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

@@ -11,14 +11,15 @@
 
 #include "ARMBuildAttributes.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/ELFAttrParserCompact.h"
 #include "llvm/Support/Error.h"
 
 namespace llvm {
 
 class ScopedPrinter;
 
-class ARMAttributeParser : public ELFCompactAttrParser {
+class LLVM_ABI ARMAttributeParser : public ELFCompactAttrParser {
   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 {
@@ -205,8 +206,8 @@ 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,
-                                                bool Prologue = true);
+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

@@ -36,8 +36,9 @@ 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,
-                                size_t TotalMemory);
+LLVM_ABI void printBumpPtrAllocatorStats(unsigned NumSlabs,
+                                         size_t BytesAllocated,
+                                         size_t TotalMemory);
 
 } // end namespace detail
 

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>
@@ -67,7 +68,7 @@ class BPFunctionNode {
   /// The ID of this node
   IDT Id;
 
-  void dump(raw_ostream &OS) const;
+  LLVM_ABI void dump(raw_ostream &OS) const;
 
 protected:
   /// The list of utility nodes associated with this node
@@ -99,10 +100,10 @@ struct BalancedPartitioningConfig {
 
 class BalancedPartitioning {
 public:
-  BalancedPartitioning(const BalancedPartitioningConfig &Config);
+  LLVM_ABI BalancedPartitioning(const BalancedPartitioningConfig &Config);
 
   /// Run recursive graph partitioning that optimizes a given objective.
-  void run(std::vector<BPFunctionNode> &Nodes) const;
+  LLVM_ABI void run(std::vector<BPFunctionNode> &Nodes) const;
 
 private:
   struct UtilitySignature;
@@ -127,7 +128,7 @@ class BalancedPartitioning {
     /// Blocking wait for all threads to complete. Unlike ThreadPool, it is
     /// acceptable for other threads to add more tasks while blocking on this
     /// call.
-    void wait();
+    LLVM_ABI void wait();
     BPThreadPool(ThreadPoolInterface &TheThreadPool)
         : TheThreadPool(TheThreadPool) {}
   };
@@ -192,8 +193,8 @@ class BalancedPartitioning {
 
 protected:
   /// Compute the move gain for uniform log-gap cost
-  static float moveGain(const BPFunctionNode &N, bool FromLeftToRight,
-                        const SignaturesT &Signatures);
+  LLVM_ABI static float moveGain(const BPFunctionNode &N, bool FromLeftToRight,
+                                 const SignaturesT &Signatures);
   friend class BalancedPartitioningTest_MoveGain_Test;
 };
 

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 +55,8 @@ 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/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);

llvm/include/llvm/Support/BinaryStreamReader.h

@@ -14,6 +14,7 @@
 #include "llvm/Support/Alignment.h"
 #include "llvm/Support/BinaryStreamArray.h"
 #include "llvm/Support/BinaryStreamRef.h"
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/ConvertUTF.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/Error.h"
@@ -29,10 +30,11 @@ namespace llvm {
 class BinaryStreamReader {
 public:
   BinaryStreamReader() = default;
-  explicit BinaryStreamReader(BinaryStreamRef Ref);
-  explicit BinaryStreamReader(BinaryStream &Stream);
-  explicit BinaryStreamReader(ArrayRef<uint8_t> Data, llvm::endianness Endian);
-  explicit BinaryStreamReader(StringRef Data, llvm::endianness Endian);
+  LLVM_ABI explicit BinaryStreamReader(BinaryStreamRef Ref);
+  LLVM_ABI explicit BinaryStreamReader(BinaryStream &Stream);
+  LLVM_ABI explicit BinaryStreamReader(ArrayRef<uint8_t> Data,
+                                       llvm::endianness Endian);
+  LLVM_ABI explicit BinaryStreamReader(StringRef Data, llvm::endianness Endian);
 
   BinaryStreamReader(const BinaryStreamReader &Other) = default;
 
@@ -46,7 +48,7 @@ class BinaryStreamReader {
   ///
   /// \returns a success error code if the data was successfully read, otherwise
   /// returns an appropriate error code.
-  Error readLongestContiguousChunk(ArrayRef<uint8_t> &Buffer);
+  LLVM_ABI Error readLongestContiguousChunk(ArrayRef<uint8_t> &Buffer);
 
   /// Read \p Size bytes from the underlying stream at the current offset and
   /// and set \p Buffer to the resulting data slice.  Whether a copy occurs
@@ -55,7 +57,7 @@ class BinaryStreamReader {
   ///
   /// \returns a success error code if the data was successfully read, otherwise
   /// returns an appropriate error code.
-  Error readBytes(ArrayRef<uint8_t> &Buffer, uint32_t Size);
+  LLVM_ABI Error readBytes(ArrayRef<uint8_t> &Buffer, uint32_t Size);
 
   /// Read an integer of the specified endianness into \p Dest and update the
   /// stream's offset.  The data is always copied from the stream's underlying
@@ -91,44 +93,44 @@ class BinaryStreamReader {
   ///
   /// \returns a success error code if the data was successfully read, otherwise
   /// returns an appropriate error code.
-  Error readULEB128(uint64_t &Dest);
+  LLVM_ABI Error readULEB128(uint64_t &Dest);
 
   /// Read a signed LEB128 encoded value.
   ///
   /// \returns a success error code if the data was successfully read, otherwise
   /// returns an appropriate error code.
-  Error readSLEB128(int64_t &Dest);
+  LLVM_ABI Error readSLEB128(int64_t &Dest);
 
   /// Read a null terminated string from \p Dest.  Whether a copy occurs depends
   /// on the implementation of the underlying stream.  Updates the stream's
   /// offset to point after the newly read data.
   ///
   /// \returns a success error code if the data was successfully read, otherwise
   /// returns an appropriate error code.
-  Error readCString(StringRef &Dest);
+  LLVM_ABI Error readCString(StringRef &Dest);
 
   /// Similar to readCString, however read a null-terminated UTF16 string
   /// instead.
   ///
   /// \returns a success error code if the data was successfully read, otherwise
   /// returns an appropriate error code.
-  Error readWideString(ArrayRef<UTF16> &Dest);
+  LLVM_ABI Error readWideString(ArrayRef<UTF16> &Dest);
 
   /// Read a \p Length byte string into \p Dest.  Whether a copy occurs depends
   /// on the implementation of the underlying stream.  Updates the stream's
   /// offset to point after the newly read data.
   ///
   /// \returns a success error code if the data was successfully read, otherwise
   /// returns an appropriate error code.
-  Error readFixedString(StringRef &Dest, uint32_t Length);
+  LLVM_ABI Error readFixedString(StringRef &Dest, uint32_t Length);
 
   /// Read the entire remainder of the underlying stream into \p Ref.  This is
   /// equivalent to calling getUnderlyingStream().slice(Offset).  Updates the
   /// stream's offset to point to the end of the stream.  Never causes a copy.
   ///
   /// \returns a success error code if the data was successfully read, otherwise
   /// returns an appropriate error code.
-  Error readStreamRef(BinaryStreamRef &Ref);
+  LLVM_ABI Error readStreamRef(BinaryStreamRef &Ref);
 
   /// Read \p Length bytes from the underlying stream into \p Ref.  This is
   /// equivalent to calling getUnderlyingStream().slice(Offset, Length).
@@ -137,7 +139,7 @@ class BinaryStreamReader {
   ///
   /// \returns a success error code if the data was successfully read, otherwise
   /// returns an appropriate error code.
-  Error readStreamRef(BinaryStreamRef &Ref, uint32_t Length);
+  LLVM_ABI Error readStreamRef(BinaryStreamRef &Ref, uint32_t Length);
 
   /// Read \p Length bytes from the underlying stream into \p Ref.  This is
   /// equivalent to calling getUnderlyingStream().slice(Offset, Length).
@@ -146,7 +148,7 @@ class BinaryStreamReader {
   ///
   /// \returns a success error code if the data was successfully read, otherwise
   /// returns an appropriate error code.
-  Error readSubstream(BinarySubstreamRef &Ref, uint32_t Length);
+  LLVM_ABI Error readSubstream(BinarySubstreamRef &Ref, uint32_t Length);
 
   /// Get a pointer to an object of type T from the underlying stream, as if by
   /// memcpy, and store the result into \p Dest.  It is up to the caller to
@@ -251,17 +253,17 @@ class BinaryStreamReader {
   ///
   /// \returns a success error code if at least \p Amount bytes remain in the
   /// stream, otherwise returns an appropriate error code.
-  Error skip(uint64_t Amount);
+  LLVM_ABI Error skip(uint64_t Amount);
 
   /// Examine the next byte of the underlying stream without advancing the
   /// stream's offset.  If the stream is empty the behavior is undefined.
   ///
   /// \returns the next byte in the stream.
-  uint8_t peek() const;
+  LLVM_ABI uint8_t peek() const;
 
-  Error padToAlignment(uint32_t Align);
+  LLVM_ABI Error padToAlignment(uint32_t Align);
 
-  std::pair<BinaryStreamReader, BinaryStreamReader>
+  LLVM_ABI std::pair<BinaryStreamReader, BinaryStreamReader>
   split(uint64_t Offset) const;
 
 private: