[llvm-readelf] Support dumping the BB address map section with --bb-addr-map.

This patch lets llvm-readelf dump the content of the BB address map
section in the following format:
```
Function {
  At: <address>
  BB entries [
    {
      Offset:   <offset>
      Size:     <size>
      Metadata: <metadata>
    },
    ...
  ]
}
...
```

Reviewed By: jhenderson

Differential Revision: https://reviews.llvm.org/D95511

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/tools/llvm-readobj/llvm-readobj.cpp b/llvm/tools/llvm-readobj/llvm-readobj.cpp
index 841313e..5d6ee25 100644
--- a/llvm/tools/llvm-readobj/llvm-readobj.cpp
+++ b/llvm/tools/llvm-readobj/llvm-readobj.cpp
@@ -367,6 +367,10 @@ namespace opts {
   cl::alias ELFCGProfile("elf-cg-profile", cl::desc("Alias for --cg-profile"),
                          cl::aliasopt(CGProfile));
 
+  // --bb-addr-map
+  cl::opt<bool> BBAddrMap("bb-addr-map",
+                          cl::desc("Display the BB address map section"));
+
   // -addrsig
   cl::opt<bool> Addrsig("addrsig",
                         cl::desc("Display address-significance table"));
@@ -542,6 +546,8 @@ static void dumpObject(ObjectFile &Obj, ScopedPrinter &Writer,
       Dumper->printHashHistograms();
     if (opts::CGProfile)
       Dumper->printCGProfile();
+    if (opts::BBAddrMap)
+      Dumper->printBBAddrMaps();
     if (opts::Addrsig)
       Dumper->printAddrsig();
     if (opts::Notes)