[llvm-bcanalyzer] Dump bitcode wrapper header

This patch enables llvm-bcanalyzer to print the bitcode wrapper header
if the file has one, which is needed to test the changes made in
r258627 (bitcode-wrapper-header-armv7m.ll is the test case for r258627).

Differential Revision: http://reviews.llvm.org/D16642


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259162 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 20 insertions, 1 deletions

diff --git a/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp b/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
index fe68689def60..48523f99441a 100644
--- a/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
+++ b/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
@@ -600,9 +600,28 @@ static bool openBitcodeFile(StringRef Path,
 
   // If we have a wrapper header, parse it and ignore the non-bc file contents.
   // The magic number is 0x0B17C0DE stored in little endian.
-  if (isBitcodeWrapper(BufPtr, EndBufPtr))
+  if (isBitcodeWrapper(BufPtr, EndBufPtr)) {
+    if (EndBufPtr - BufPtr < BWH_HeaderSize)
+      return Error("Invalid bitcode wrapper header");
+
+    if (Dump) {
+      unsigned Magic = support::endian::read32le(&BufPtr[BWH_MagicField]);
+      unsigned Version = support::endian::read32le(&BufPtr[BWH_VersionField]);
+      unsigned Offset = support::endian::read32le(&BufPtr[BWH_OffsetField]);
+      unsigned Size = support::endian::read32le(&BufPtr[BWH_SizeField]);
+      unsigned CPUType = support::endian::read32le(&BufPtr[BWH_CPUTypeField]);
+
+      outs() << "<BITCODE_WRAPPER_HEADER"
+             << " Magic=" << format_hex(Magic, 10)
+             << " Version=" << format_hex(Version, 10)
+             << " Offset=" << format_hex(Offset, 10)
+             << " Size=" << format_hex(Size, 10)
+             << " CPUType=" << format_hex(CPUType, 10) << "/>\n";
+    }
+
     if (SkipBitcodeWrapperHeader(BufPtr, EndBufPtr, true))
       return Error("Invalid bitcode wrapper header");
+  }
 
   StreamFile = BitstreamReader(BufPtr, EndBufPtr);
   Stream = BitstreamCursor(StreamFile);