[FaultMaps] Add a parser for the __llvm__faultmaps section.

Summary:
The parser is exercised by llvm-objdump using -print-fault-maps.  As is
probably obvious, the code itself was "heavily inspired" by
http://reviews.llvm.org/D10434.

Reviewers: reames, atrick, JosephTremoulet

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D10491

llvm-svn: 240304

1 files changed, 37 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/FaultMaps.cpp b/llvm/lib/CodeGen/FaultMaps.cpp
index 0512ff95d1b..21da4f13bfb 100644
--- a/llvm/lib/CodeGen/FaultMaps.cpp
+++ b/llvm/lib/CodeGen/FaultMaps.cpp
@@ -112,3 +112,40 @@ const char *FaultMaps::faultTypeToString(FaultMaps::FaultKind FT) {
     return "FaultingLoad";
   }
 }
+
+raw_ostream &llvm::
+operator<<(raw_ostream &OS,
+           const typename FaultMapParser::FunctionFaultInfoAccessor &FFI) {
+  OS << "Fault kind: "
+     << FaultMaps::faultTypeToString((FaultMaps::FaultKind)FFI.getFaultKind())
+     << ", faulting PC offset: " << FFI.getFaultingPCOffset()
+     << ", handling PC offset: " << FFI.getHandlerPCOffset();
+  return OS;
+}
+
+raw_ostream &llvm::
+operator<<(raw_ostream &OS,
+           const typename FaultMapParser::FunctionInfoAccessor &FI) {
+  OS << "FunctionAddress: " << format_hex(FI.getFunctionAddr(), 8)
+     << ", NumFaultingPCs: " << FI.getNumFaultingPCs() << "\n";
+  for (unsigned i = 0, e = FI.getNumFaultingPCs(); i != e; ++i)
+    OS << FI.getFunctionFaultInfoAt(i) << "\n";
+  return OS;
+}
+
+raw_ostream &llvm::operator<<(raw_ostream &OS, const FaultMapParser &FMP) {
+  OS << "Version: " << format_hex(FMP.getFaultMapVersion(), 2) << "\n";
+  OS << "NumFunctions: " << FMP.getNumFunctions() << "\n";
+
+  if (FMP.getNumFunctions() == 0)
+    return OS;
+
+  typename FaultMapParser::FunctionInfoAccessor FI;
+
+  for (unsigned i = 0, e = FMP.getNumFunctions(); i != e; ++i) {
+    FI = (i == 0) ? FMP.getFirstFunctionInfo() : FI.getNextFunctionInfo();
+    OS << FI;
+  }
+
+  return OS;
+}