Make rr::Print output to debugger and be stubbed

src/Reactor/LLVMJIT.cpp

@@ -434,6 +434,9 @@ void *resolveExternalSymbol(const char *name)
 
 		Resolver()
 		{
+#ifdef ENABLE_RR_PRINT
+			functions.emplace("rr::DebugPrintf", reinterpret_cast<void *>(rr::DebugPrintf));
+#endif
 			functions.emplace("nop", reinterpret_cast<void *>(F::nop));
 			functions.emplace("floorf", reinterpret_cast<void *>(floorf));
 			functions.emplace("nearbyintf", reinterpret_cast<void *>(nearbyintf));

src/Reactor/LLVMReactor.cpp

@@ -3985,7 +3985,7 @@ void VPrintf(const std::vector<Value *> &vals)
 	auto i32Ty = ::llvm::Type::getInt32Ty(jit->context);
 	auto i8PtrTy = ::llvm::Type::getInt8PtrTy(jit->context);
 	auto funcTy = ::llvm::FunctionType::get(i32Ty, { i8PtrTy }, true);
-	auto func = jit->module->getOrInsertFunction("printf", funcTy);
+	auto func = jit->module->getOrInsertFunction("rr::DebugPrintf", funcTy);
 	jit->builder->CreateCall(func, V(vals));
 }
 #endif  // ENABLE_RR_PRINT

src/Reactor/Reactor.cpp

@@ -20,6 +20,13 @@
 #include <algorithm>
 #include <cmath>
 
+#if defined(_WIN32)
+#	ifndef WIN32_LEAN_AND_MEAN
+#		define WIN32_LEAN_AND_MEAN
+#	endif
+#	include <windows.h>
+#endif
+
 namespace rr {
 
 const Config::Edit Config::Edit::None = {};
@@ -4568,6 +4575,35 @@ void Printv(const char *function, const char *file, int line, const char *fmt, s
 	// This call is implemented by each backend
 	VPrintf(vals);
 }
+
+// This is the function that is called by VPrintf from the backends
+int DebugPrintf(const char *format, ...)
+{
+	// Uncomment this to make it so that we do not print, but the call to this function is emitted.
+	// Useful when debugging emitted code to see the Reactor source location.
+	//#	define RR_PRINT_OUTPUT_TYPE_STUB
+
+#	if defined(RR_PRINT_OUTPUT_TYPE_STUB)
+	return 0;
+#	else
+
+	int result;
+	va_list args;
+
+	va_start(args, format);
+	char buffer[2048];
+	result = vsprintf(buffer, format, args);
+	va_end(args);
+
+	std::fputs(buffer, stdout);
+#		if defined(_WIN32)
+	OutputDebugString(buffer);
+#		endif
+
+	return result;
+#	endif
+}
+
 #endif  // ENABLE_RR_PRINT
 
 }  // namespace rr

src/Reactor/Reactor.hpp

@@ -48,6 +48,12 @@ void FlushDebug();
 #	define RR_DEBUG_INFO_FLUSH()
 #endif  // ENABLE_RR_DEBUG_INFO
 
+#ifdef ENABLE_RR_PRINT
+namespace rr {
+int DebugPrintf(const char *format, ...);
+}
+#endif
+
 namespace rr {
 
 std::string BackendName();

src/Reactor/SubzeroReactor.cpp

@@ -849,7 +849,7 @@ private:
 #ifdef ENABLE_RR_PRINT
 void VPrintf(const std::vector<Value *> &vals)
 {
-	sz::Call(::function, ::basicBlock, Ice::IceType_i32, reinterpret_cast<const void *>(::printf), V(vals), true);
+	sz::Call(::function, ::basicBlock, Ice::IceType_i32, reinterpret_cast<const void *>(rr::DebugPrintf), V(vals), true);
 }
 #endif  // ENABLE_RR_PRINT