-// getErrorOutputStream - Returns the error output stream (std::cerr). This
-// places the std::c* I/O streams into one .cpp file and relieves the whole
-// program from having to have hundreds of static c'tor/d'tors for them.
-//
-llvm_ostream llvm::getErrorOutputStream(const char *DebugType) {
- if (DebugFlag && isCurrentDebugType(DebugType))
- return llvm_cerr;
- else
- return llvm_null;
+/// setCurrentDebugType - Set the current debug type, as if the -debug-only=X
+/// option were specified. Note that DebugFlag also needs to be set to true for
+/// debug output to be produced.
+///
+void llvm::setCurrentDebugType(const char *Type) {
+ CurrentDebugType = Type;
+}
+
+/// dbgs - Return a circular-buffered debug stream.
+raw_ostream &llvm::dbgs() {
+ // Do one-time initialization in a thread-safe way.
+ static struct dbgstream {
+ circular_raw_ostream strm;
+
+ dbgstream() :
+ strm(errs(), "*** Debug Log Output ***\n",
+ (!EnableDebugBuffering || !DebugFlag) ? 0 : DebugBufferSize) {
+ if (EnableDebugBuffering && DebugFlag && DebugBufferSize != 0)
+ // TODO: Add a handler for SIGUSER1-type signals so the user can
+ // force a debug dump.
+ sys::AddSignalHandler(&debug_user_sig_handler, nullptr);
+ // Otherwise we've already set the debug stream buffer size to
+ // zero, disabling buffering so it will output directly to errs().
+ }
+ } thestrm;
+
+ return thestrm.strm;
+}
+
+#else
+// Avoid "has no symbols" warning.
+namespace llvm {
+ /// dbgs - Return errs().
+ raw_ostream &dbgs() {
+ return errs();
+ }