Use flags for generating missing function names (#335)

When there is no rizin function, but a flag and we need to generate some
function name there, we can use the flag name instead of the default
behavior, which is to call it "func_<addr>".

src/RizinPrintC.cpp

@@ -2,10 +2,15 @@
 // SPDX-License-Identifier: LGPL-3.0-or-later
 
 #include "RizinPrintC.h"
+#include "RizinArchitecture.h"
 
 #include <varnode.hh>
 #include <architecture.hh>
 
+#include <rz_core.h>
+
+#include "RizinUtils.h"
+
 using namespace ghidra;
 
 // Constructing this registers the capability
@@ -42,3 +47,27 @@ void RizinPrintC::pushUnnamedLocation(const Address &addr, const Varnode *vn, co
 		PrintC::pushUnnamedLocation(addr,vn, op);
 	}
 }
+
+std::string RizinPrintC::genericFunctionName(const ghidra::Address &addr)
+{
+	auto arch = dynamic_cast<RizinArchitecture *>(glb);
+	if (arch) {
+		RzCoreLock core(arch->getCore());
+		const RzList *flags = rz_flag_get_list(core->flags, addr.getOffset());
+		if(flags)
+		{
+			RzListIter *iter;
+			void *pos;
+			rz_list_foreach(flags, iter, pos)
+			{
+				auto flag = reinterpret_cast<RzFlagItem *>(pos);
+				if(flag->space && flag->space->name && !strcmp(flag->space->name, RZ_FLAGS_FS_SECTIONS))
+					continue;
+				if(core->flags->realnames && flag->realname)
+					return flag->realname;
+				return flag->name;
+			}
+		}
+	}
+	return PrintC::genericFunctionName(addr);
+}

src/RizinPrintC.h

@@ -10,6 +10,7 @@ class RizinPrintC : public ghidra::PrintC
 {
 	protected:
 		void pushUnnamedLocation(const ghidra::Address &addr, const ghidra::Varnode *vn,const ghidra::PcodeOp *op) override;
+		std::string genericFunctionName(const ghidra::Address &addr) override;
 
 	public:
 		explicit RizinPrintC(ghidra::Architecture *g, const std::string &nm = "c-language");