From d9f7ad54e552262ee0090e88d5abd3e04fcdeac8 Mon Sep 17 00:00:00 2001
From: Thomas Munro <tmunro@postgresql.org>
Date: Wed, 16 Mar 2022 11:35:00 +1300
Subject: [PATCH] Back-patch LLVM 14 API changes.

Since LLVM 14 has stopped changing and is about to be released,
back-patch the following changes from the master branch:

  e6a7600202105919bffd62b3dfd941f4a94e082b
  807fee1a39de6bb8184082012e643951abb9ad1d
  a56e7b66010f330782243de9e25ac2a6596be0e1

Back-patch to 11, where LLVM JIT support came in.
---
 src/backend/jit/llvm/Makefile           |  6 +++++
 src/backend/jit/llvm/llvmjit_error.cpp  | 35 +++++++++++++++++++++----
 src/backend/jit/llvm/llvmjit_inline.cpp | 12 ++++++++-
 3 files changed, 47 insertions(+), 6 deletions(-)

diff --git a/src/backend/jit/llvm/Makefile b/src/backend/jit/llvm/Makefile
index 0268bd46d5..2da122a391 100644
--- a/src/backend/jit/llvm/Makefile
+++ b/src/backend/jit/llvm/Makefile
@@ -22,6 +22,12 @@ endif
 PGFILEDESC = "llvmjit - JIT using LLVM"
 NAME = llvmjit
 
+# LLVM 14 produces deprecation warnings.  We'll need to make some changes
+# before the relevant functions are removed, but for now silence the warnings.
+ifeq ($(GCC), yes)
+LLVM_CFLAGS += -Wno-deprecated-declarations
+endif
+
 # All files in this directory use LLVM.
 CFLAGS += $(LLVM_CFLAGS)
 CXXFLAGS += $(LLVM_CXXFLAGS)
diff --git a/src/backend/jit/llvm/llvmjit_error.cpp b/src/backend/jit/llvm/llvmjit_error.cpp
index f4720732a3..5ad92f3090 100644
--- a/src/backend/jit/llvm/llvmjit_error.cpp
+++ b/src/backend/jit/llvm/llvmjit_error.cpp
@@ -23,15 +23,22 @@ extern "C"
 
 #include "jit/llvmjit.h"
 
+#include <new>
 
 static int fatal_new_handler_depth = 0;
 static std::new_handler old_new_handler = NULL;
 
 static void fatal_system_new_handler(void);
 #if LLVM_VERSION_MAJOR > 4
+static void fatal_llvm_new_handler(void *user_data, const char *reason, bool gen_crash_diag);
+#if LLVM_VERSION_MAJOR < 14
 static void fatal_llvm_new_handler(void *user_data, const std::string& reason, bool gen_crash_diag);
 #endif
+#endif
+static void fatal_llvm_error_handler(void *user_data, const char *reason, bool gen_crash_diag);
+#if LLVM_VERSION_MAJOR < 14
 static void fatal_llvm_error_handler(void *user_data, const std::string& reason, bool gen_crash_diag);
+#endif
 
 
 /*
@@ -129,23 +136,41 @@ fatal_system_new_handler(void)
 #if LLVM_VERSION_MAJOR > 4
 static void
 fatal_llvm_new_handler(void *user_data,
-					   const std::string& reason,
+					   const char *reason,
 					   bool gen_crash_diag)
 {
 	ereport(FATAL,
 			(errcode(ERRCODE_OUT_OF_MEMORY),
 			 errmsg("out of memory"),
-			 errdetail("While in LLVM: %s", reason.c_str())));
+			 errdetail("While in LLVM: %s", reason)));
+}
+#if LLVM_VERSION_MAJOR < 14
+static void
+fatal_llvm_new_handler(void *user_data,
+					   const std::string& reason,
+					   bool gen_crash_diag)
+{
+	fatal_llvm_new_handler(user_data, reason.c_str(), gen_crash_diag);
 }
 #endif
+#endif
 
 static void
 fatal_llvm_error_handler(void *user_data,
-						 const std::string& reason,
+						 const char *reason,
 						 bool gen_crash_diag)
 {
 	ereport(FATAL,
 			(errcode(ERRCODE_OUT_OF_MEMORY),
-			 errmsg("fatal llvm error: %s",
-					reason.c_str())));
+			 errmsg("fatal llvm error: %s", reason)));
 }
+
+#if LLVM_VERSION_MAJOR < 14
+static void
+fatal_llvm_error_handler(void *user_data,
+						 const std::string& reason,
+						 bool gen_crash_diag)
+{
+	fatal_llvm_error_handler(user_data, reason.c_str(), gen_crash_diag);
+}
+#endif
diff --git a/src/backend/jit/llvm/llvmjit_inline.cpp b/src/backend/jit/llvm/llvmjit_inline.cpp
index 6f03595db5..9bb4b672a7 100644
--- a/src/backend/jit/llvm/llvmjit_inline.cpp
+++ b/src/backend/jit/llvm/llvmjit_inline.cpp
@@ -594,7 +594,11 @@ function_inlinable(llvm::Function &F,
 	if (F.materialize())
 		elog(FATAL, "failed to materialize metadata");
 
-	if (F.getAttributes().hasFnAttribute(llvm::Attribute::NoInline))
+#if LLVM_VERSION_MAJOR < 14
+#define hasFnAttr hasFnAttribute
+#endif
+
+	if (F.getAttributes().hasFnAttr(llvm::Attribute::NoInline))
 	{
 		ilog(DEBUG1, "ineligibile to import %s due to noinline",
 			 F.getName().data());
@@ -871,7 +875,9 @@ create_redirection_function(std::unique_ptr<llvm::Module> &importMod,
 	llvm::Function *AF;
 	llvm::BasicBlock *BB;
 	llvm::CallInst *fwdcall;
+#if LLVM_VERSION_MAJOR < 14
 	llvm::Attribute inlineAttribute;
+#endif
 
 	AF = llvm::Function::Create(F->getFunctionType(),
 								LinkageTypes::AvailableExternallyLinkage,
@@ -880,9 +886,13 @@ create_redirection_function(std::unique_ptr<llvm::Module> &importMod,
 
 	Builder.SetInsertPoint(BB);
 	fwdcall = Builder.CreateCall(F, &*AF->arg_begin());
+#if LLVM_VERSION_MAJOR < 14
 	inlineAttribute = llvm::Attribute::get(Context,
 										   llvm::Attribute::AlwaysInline);
 	fwdcall->addAttribute(~0U, inlineAttribute);
+#else
+	fwdcall->addFnAttr(llvm::Attribute::AlwaysInline);
+#endif
 	Builder.CreateRet(fwdcall);
 
 	return AF;
-- 
2.30.2