Add support for fetching inlining context (stack of source code locations)

by instruction address from DWARF.

Add --inlining flag to llvm-dwarfdump to demonstrate and test this functionality,
so that "llvm-dwarfdump --inlining --address=0x..." now works much like
"addr2line -i 0x...", provided that the binary has debug info
(Clang's -gline-tables-only *is* enough).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163128 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 32 insertions, 9 deletions

diff --git a/tools/llvm-dwarfdump/llvm-dwarfdump.cpp b/tools/llvm-dwarfdump/llvm-dwarfdump.cpp
index 59ecafaa77..38c3a1e76f 100644
--- a/tools/llvm-dwarfdump/llvm-dwarfdump.cpp
+++ b/tools/llvm-dwarfdump/llvm-dwarfdump.cpp
@@ -44,6 +44,18 @@ PrintFunctions("functions", cl::init(false),
                cl::desc("Print function names as well as line information "
                         "for a given address"));
 
+static cl::opt<bool>
+PrintInlining("inlining", cl::init(false),
+              cl::desc("Print all inlined frames for a given address"));
+
+static void PrintDILineInfo(DILineInfo dli) {
+  if (PrintFunctions)
+    outs() << (dli.getFunctionName() ? dli.getFunctionName() : "<unknown>")
+           << "\n";
+  outs() << (dli.getFileName() ? dli.getFileName() : "<unknown>") << ':'
+         << dli.getLine() << ':' << dli.getColumn() << '\n';
+}
+
 static void DumpInput(const StringRef &Filename) {
   OwningPtr<MemoryBuffer> Buff;
 
@@ -101,16 +113,27 @@ static void DumpInput(const StringRef &Filename) {
     dictx->dump(outs());
   } else {
     // Print line info for the specified address.
-    int spec_flags = DILineInfoSpecifier::FileLineInfo |
-                     DILineInfoSpecifier::AbsoluteFilePath;
-    if (PrintFunctions)
-      spec_flags |= DILineInfoSpecifier::FunctionName;
-    DILineInfo dli = dictx->getLineInfoForAddress(Address, spec_flags);
+    int SpecFlags = DILineInfoSpecifier::FileLineInfo |
+                    DILineInfoSpecifier::AbsoluteFilePath;
     if (PrintFunctions)
-      outs() << (dli.getFunctionName() ? dli.getFunctionName() : "<unknown>")
-             << "\n";
-    outs() << (dli.getFileName() ? dli.getFileName() : "<unknown>") << ':'
-           << dli.getLine() << ':' << dli.getColumn() << '\n';
+      SpecFlags |= DILineInfoSpecifier::FunctionName;
+    if (PrintInlining) {
+      DIInliningInfo InliningInfo = dictx->getInliningInfoForAddress(
+          Address, SpecFlags);
+      uint32_t n = InliningInfo.getNumberOfFrames();
+      if (n == 0) {
+        // Print one empty debug line info in any case.
+        PrintDILineInfo(DILineInfo());
+      } else {
+        for (uint32_t i = 0; i < n; i++) {
+          DILineInfo dli = InliningInfo.getFrame(i);
+          PrintDILineInfo(dli);
+        }
+      }
+    } else {
+      DILineInfo dli = dictx->getLineInfoForAddress(Address, SpecFlags);
+      PrintDILineInfo(dli);
+    }
   }
 }