[sanitizer_symbolizer] Add MarkupStackTracePrinter

This PR is part of a stack, llvm#73029 should be merged
and reviewed first. Please only review the last commit
of this PR.

Adds a new Implementation of StackTracePrinter that only
emits symbolizer markup. Currently this change only
affects Fuchsia OS. Should be NFC.

Author: Andrés Villegas

compiler-rt/lib/sanitizer_common/sanitizer_stacktrace_printer.cpp

@@ -12,6 +12,7 @@
 
 #include "sanitizer_stacktrace_printer.h"
 
+#include "sanitizer_common.h"
 #include "sanitizer_file.h"
 #include "sanitizer_flags.h"
 #include "sanitizer_fuchsia.h"
@@ -25,8 +26,7 @@ StackTracePrinter *StackTracePrinter::GetOrInit() {
   if (stacktrace_printer)
     return stacktrace_printer;
 
-  stacktrace_printer =
-      new (GetGlobalLowLevelAllocator()) FormattedStackTracePrinter();
+  stacktrace_printer = StackTracePrinter::PlatformInit();
 
   CHECK(stacktrace_printer);
   return stacktrace_printer;
@@ -61,6 +61,10 @@ const char *StackTracePrinter::StripFunctionName(const char *function) {
 // sanitizer_symbolizer_markup.cpp implements these differently.
 #if !SANITIZER_SYMBOLIZER_MARKUP
 
+StackTracePrinter *StackTracePrinter::PlatformInit() {
+  return new (GetGlobalLowLevelAllocator()) FormattedStackTracePrinter();
+}
+
 static const char *DemangleFunctionName(const char *function) {
   if (!common_flags()->demangle)
     return function;

compiler-rt/lib/sanitizer_common/sanitizer_stacktrace_printer.h

@@ -46,6 +46,10 @@ class StackTracePrinter {
                           const DataInfo *DI,
                           const char *strip_path_prefix = "") = 0;
 
+ private:
+  // To be called from StackTracePrinter::GetOrInit
+  static StackTracePrinter *PlatformInit();
+
  protected:
   ~StackTracePrinter() {}
 };

compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_markup.cpp

@@ -76,27 +76,29 @@ bool Symbolizer::SymbolizeData(uptr addr, DataInfo *info) {
   return true;
 }
 
-// We ignore the format argument to __sanitizer_symbolize_global.
-void FormattedStackTracePrinter::RenderData(InternalScopedString *buffer,
-                                            const char *format,
-                                            const DataInfo *DI,
-                                            const char *strip_path_prefix) {
-  buffer->AppendF(kFormatData, DI->start);
-}
-
-bool FormattedStackTracePrinter::RenderNeedsSymbolization(const char *format) {
-  return false;
-}
-
-// We don't support the stack_trace_format flag at all.
-void FormattedStackTracePrinter::RenderFrame(InternalScopedString *buffer,
-                                             const char *format, int frame_no,
-                                             uptr address,
-                                             const AddressInfo *info,
-                                             bool vs_style,
-                                             const char *strip_path_prefix) {
-  CHECK(!RenderNeedsSymbolization(format));
-  buffer->AppendF(kFormatFrame, frame_no, address);
+class MarkupStackTracePrinter : public StackTracePrinter {
+  // We ignore the format argument to __sanitizer_symbolize_global.
+  void RenderData(InternalScopedString *buffer, const char *format,
+                  const DataInfo *DI, const char *strip_path_prefix) override {
+    buffer->AppendF(kFormatData, DI->start);
+  }
+
+  bool RenderNeedsSymbolization(const char *format) override { return false; }
+
+  // We don't support the stack_trace_format flag at all.
+  void RenderFrame(InternalScopedString *buffer, const char *format,
+                   int frame_no, uptr address, const AddressInfo *info,
+                   bool vs_style, const char *strip_path_prefix) override {
+    CHECK(!RenderNeedsSymbolization(format));
+    buffer->AppendF(kFormatFrame, frame_no, address);
+  }
+
+ protected:
+  ~MarkupStackTracePrinter();
+};
+
+StackTracePrinter *StackTracePrinter::PlatformInit() {
+  return new (GetGlobalLowLevelAllocator()) MarkupStackTracePrinter();
 }
 
 Symbolizer *Symbolizer::PlatformInit() {