Function llvm_execute_inline_plan

src/backend/jit/llvm/llvmjit_inline.cpp:369–459

* Perform the actual inlining of external functions (and their dependencies) * into mod. */

 * into mod.
 */
static void
llvm_execute_inline_plan(llvm::Module *mod, ImportMapTy *globalsToInline)
{
	llvm::IRMover Mover(*mod);

	for (const auto& toInline : *globalsToInline)
	{
		const llvm::StringRef& modPath = toInline.first();
		const llvm::StringSet<>& modGlobalsToInline = toInline.second;
		llvm::SetVector<llvm::GlobalValue *> GlobalsToImport;

		Assert(module_cache->count(modPath));
		std::unique_ptr<llvm::Module> importMod(std::move((*module_cache)[modPath]));
		module_cache->erase(modPath);

		if (modGlobalsToInline.empty())
			continue;

		for (auto &glob: modGlobalsToInline)
		{
			llvm::StringRef SymbolName = glob.first();
			char *modname;
			char *funcname;

			llvm_split_symbol_name(SymbolName.data(), &modname, &funcname);

			llvm::GlobalValue *valueToImport = importMod->getNamedValue(funcname);

			if (!valueToImport)
				elog(FATAL, "didn't refind value %s to import", SymbolName.data());

			/*
			 * For functions (global vars are only inlined if already static),
			 * mark imported variables as being clones from other
			 * functions. That a) avoids symbol conflicts b) allows the
			 * optimizer to perform inlining.
			*/
			if (llvm::isa<llvm::Function>(valueToImport))
			{
				llvm::Function *F = llvm::dyn_cast<llvm::Function>(valueToImport);
				typedef llvm::GlobalValue::LinkageTypes LinkageTypes;

				/*
				 * Per-function info isn't necessarily stripped yet, as the
				 * module is lazy-loaded when stripped above.
				 */
				llvm::stripDebugInfo(*F);

				/*
				 * If the to-be-imported function is one referenced including
				 * its module name, create a tiny inline function that just
				 * forwards the call. One might think a GlobalAlias would do
				 * the trick, but a) IRMover doesn't override a declaration
				 * with an alias pointing to a definition (instead renaming
				 * it), b) Aliases can't be AvailableExternally.
				 */
				if (modname)
				{