From e5e189f669326194d03cb499f906a905c41bd767 Mon Sep 17 00:00:00 2001
From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Wed, 21 Sep 2011 21:47:35 +0000
Subject: X86Disassembler: if verbose logging is going to nulls(), disable
 logging completely.

Otherwise we'll spend a ridiculous amount of time pretty printing debug output and then discarding it.

llvm-svn: 140276
---
 llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp')

diff --git a/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp b/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp
index 884e690efae..3aacb20e73d 100644
--- a/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp
+++ b/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp
@@ -117,11 +117,15 @@ X86GenericDisassembler::getInstruction(MCInst &instr,
                                        raw_ostream &vStream,
                                        raw_ostream &cStream) const {
   InternalInstruction internalInstr;
+
+  dlog_t loggerFn = logger;
+  if (&vStream == &nulls())
+    loggerFn = 0; // Disable logging completely if it's going to nulls().
   
   int ret = decodeInstruction(&internalInstr,
                               regionReader,
                               (void*)&region,
-                              logger,
+                              loggerFn,
                               (void*)&vStream,
                               address,
                               fMode);
-- 
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