For disassembly when adding a symbolic operand that is a C++

symbol name, also put the human readable name in a comment.

Also fix a bug in LLVMDisasmInstruction() that was not flushing
the raw_svector_ostream for the disassembled instruction string
before copying it to the output buffer that was causing truncation
of the output.

rdar://10173828

llvm-svn: 198441

2 files changed, 10 insertions, 0 deletions

diff --git a/llvm/lib/MC/MCDisassembler/Disassembler.cpp b/llvm/lib/MC/MCDisassembler/Disassembler.cpp
index a0066c8885c..b0b8138e711 100644
--- a/llvm/lib/MC/MCDisassembler/Disassembler.cpp
+++ b/llvm/lib/MC/MCDisassembler/Disassembler.cpp
@@ -298,6 +298,7 @@ size_t LLVMDisasmInstruction(LLVMDisasmContextRef DCR, uint8_t *Bytes,
       emitLatency(DC, Inst);
 
     emitComments(DC, FormattedOS);
+    OS.flush();
 
     assert(OutStringSize != 0 && "Output buffer cannot be zero size");
     size_t OutputSize = std::min(OutStringSize-1, InsnStr.size());
diff --git a/llvm/lib/MC/MCExternalSymbolizer.cpp b/llvm/lib/MC/MCExternalSymbolizer.cpp
index ca368b27e19..dae3f522a4f 100644
--- a/llvm/lib/MC/MCExternalSymbolizer.cpp
+++ b/llvm/lib/MC/MCExternalSymbolizer.cpp
@@ -13,6 +13,7 @@
 #include "llvm/MC/MCInst.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cstring>
+#include <cxxabi.h>
 
 using namespace llvm;
 
@@ -56,6 +57,14 @@ bool MCExternalSymbolizer::tryAddingSymbolicOperand(MCInst &MI,
     if (Name) {
       SymbolicOp.AddSymbol.Name = Name;
       SymbolicOp.AddSymbol.Present = true;
+      // If Name is a C++ symbol name put the human readable name in a comment.
+      if (strncmp(Name, "__Z", 3) == 0) {
+        char *demangled = abi::__cxa_demangle(Name + 1, 0, 0, 0);
+	if (demangled) {
+          cStream << demangled;
+          free(demangled);
+        }
+      }
     }
     // For branches always create an MCExpr so it gets printed as hex address.
     else if (IsBranch) {