From 6bfb66385d2efd05149c07fcca7635c37671a6f1 Mon Sep 17 00:00:00 2001
From: Jeremy Rand <jeremy@rand-family.com>
Date: Tue, 28 Jul 2015 00:18:06 -0400
Subject: [PATCH] Add a logging mechanism to make it easier to debug the 65816
 code.

---
 lib/Target/WDC65816/WDC65816.h                | 12 +++++++++
 lib/Target/WDC65816/WDC65816TargetMachine.cpp | 27 +++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/lib/Target/WDC65816/WDC65816.h b/lib/Target/WDC65816/WDC65816.h
index 9636e28f..2089bd7b 100644
--- a/lib/Target/WDC65816/WDC65816.h
+++ b/lib/Target/WDC65816/WDC65816.h
@@ -19,6 +19,16 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Target/TargetMachine.h"
 
+
+#define WDC_DEBUG   // This is a debug build option which enables logging and perhaps more in the future.
+
+#ifdef WDC_DEBUG
+#define WDC_LOG(...) llvm::logWDCMessage(__FILE__, __func__, __LINE__, __VA_ARGS__)
+#else
+#define WDC_LOG(...)
+#endif
+
+
 namespace llvm {
     class FunctionPass;
     class WDC65816TargetMachine;
@@ -26,6 +36,8 @@ namespace llvm {
     
     FunctionPass *createWDC65816ISelDag(WDC65816TargetMachine &TM);
     
+    void logWDCMessage(const char *file, const char *function, unsigned int linenum, const char *format, ...);
+    
 } // end namespace llvm;
 
 namespace llvm {
diff --git a/lib/Target/WDC65816/WDC65816TargetMachine.cpp b/lib/Target/WDC65816/WDC65816TargetMachine.cpp
index 56508293..9e474343 100644
--- a/lib/Target/WDC65816/WDC65816TargetMachine.cpp
+++ b/lib/Target/WDC65816/WDC65816TargetMachine.cpp
@@ -10,6 +10,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+
+#include <sys/time.h>
+
 #include "WDC65816TargetMachine.h"
 #include "WDC65816.h"
 #include "llvm/CodeGen/Passes.h"
@@ -21,6 +24,7 @@ using namespace llvm;
 extern "C" void LLVMInitializeWDC65816Target() {
     // Register the target.
     RegisterTargetMachine<WDC65816TargetMachine> X(TheWDC65816Target);
+    WDC_LOG("Registered the target machine");
 }
 
 /// WDC65816TargetMachine ctor
@@ -70,3 +74,26 @@ bool WDC65816PassConfig::addInstSelector() {
 bool WDC65816PassConfig::addPreEmitPass(){
     return false;
 }
+
+
+void llvm::logWDCMessage(const char *file, const char *function, unsigned int linenum, const char *format, ...)
+{
+    char timebuf[64];
+    va_list args;
+    struct timeval now;
+    const char *filename = strrchr(file, '/');
+    
+    if (filename != NULL)
+        filename++;
+    else
+        filename = file;
+    
+    gettimeofday(&now, NULL);
+    strftime(timebuf, sizeof(timebuf), "%T", localtime(&(now.tv_sec)));
+    
+    va_start(args, format);
+    fprintf(stderr, "| WDCLog | %s.%06u | %s:%u | %s | ", timebuf, now.tv_usec, filename, linenum, function);
+    vfprintf(stderr, format, args);
+    fprintf(stderr, " |\n");
+    va_end (args);
+}