[xray] add --no-demangle cli opt for llvm-xray extract to output mangled names

This adds an additional cli flag for the llvm-xray extract tool.  This
is useful if you're more interested in consuming the mangled symbol
name, instead of the default now which is demangled.

Differential Revision: https://reviews.llvm.org/D72804

Author: johnislarry

llvm/test/tools/llvm-xray/AArch64/extract-instrmap-aarch64-mangled.test

@@ -0,0 +1,14 @@
+This test makes sure we can extract the instrumentation map from an
+XRay-instrumented PIE file.
+
+RUN: yaml2obj %S/Inputs/elf64-pic.yaml -o %t.so
+RUN: llvm-xray extract -s --no-demangle %t.so | FileCheck %s
+
+CHECK:      ---
+CHECK-NEXT: - { id: 1, address: 0x0000000000000420, function: 0x0000000000000420, kind: function-enter, always-instrument: true, function-name: _Z3foov }
+CHECK-NEXT: - { id: 1, address: 0x0000000000000440, function: 0x0000000000000420, kind: function-exit, always-instrument: true, function-name: _Z3foov }
+CHECK-NEXT: - { id: 2, address: 0x0000000000000464, function: 0x0000000000000464, kind: function-enter, always-instrument: true, function-name: _Z3barv }
+CHECK-NEXT: - { id: 2, address: 0x0000000000000484, function: 0x0000000000000464, kind: function-exit, always-instrument: true, function-name: _Z3barv }
+CHECK-NEXT: - { id: 3, address: 0x00000000000004A8, function: 0x00000000000004A8, kind: function-enter, always-instrument: true, function-name: _Z3jarv }
+CHECK-NEXT: - { id: 3, address: 0x00000000000004C8, function: 0x00000000000004A8, kind: function-exit, always-instrument: true, function-name: _Z3jarv }
+CHECK-NEXT: ...

llvm/tools/llvm-xray/xray-extract.cpp

@@ -45,6 +45,11 @@ static cl::opt<bool> ExtractSymbolize("symbolize", cl::value_desc("symbolize"),
                                       cl::sub(Extract));
 static cl::alias ExtractSymbolize2("s", cl::aliasopt(ExtractSymbolize),
                                    cl::desc("alias for -symbolize"));
+static cl::opt<bool> ExtractNoDemangle("no-demangle",
+                                       cl::value_desc("no-demangle"),
+                                       cl::init(false),
+                                       cl::desc("don't demangle symbols"),
+                                       cl::sub(Extract));
 
 namespace {
 
@@ -84,7 +89,10 @@ static CommandRegistration Unused(&Extract, []() -> Error {
         Twine("Cannot open file '") + ExtractOutput + "' for writing.", EC);
   const auto &FunctionAddresses =
       InstrumentationMapOrError->getFunctionAddresses();
-  symbolize::LLVMSymbolizer Symbolizer;
+  symbolize::LLVMSymbolizer::Options opts;
+  if (ExtractNoDemangle)
+    opts.Demangle = false;
+  symbolize::LLVMSymbolizer Symbolizer(opts);
   llvm::xray::FuncIdConversionHelper FuncIdHelper(ExtractInput, Symbolizer,
                                                   FunctionAddresses);
   exportAsYAML(*InstrumentationMapOrError, OS, FuncIdHelper);