commit a383648d3a0057264882d4b4a54f06fe0a61f912
author Christopher Ferris <cferris@google.com> Fri May 13 12:09:39 2022 -0700
committer Christopher Ferris <cferris@google.com> Wed May 18 17:05:05 2022 -0700
tree 513852af8fd45f3f8ae02be4000cf7c0fcaa6607
parent c7b31befbfba5e96862bd75b24a6d2ba3bf7b0d4

Add options to only backtrace specific sizes.

Add backtrace_size for only backtracing a single size.
Add backtrace_min_size to set the minimum value of size to backtrace.
Add backtrace_max_size to set the maximum value of size to backtrace.

Documented the new options.

Test: New unit test pass.
Change-Id: I1a773737910cd4bc2af9546547b3a2740bbcb22b

libc/malloc_debug/Config.cpp

diff --git a/libc/malloc_debug/Config.cpp b/libc/malloc_debug/Config.cpp
index 5fd511f..6a81277 100644
--- a/libc/malloc_debug/Config.cpp
+++ b/libc/malloc_debug/Config.cpp
@@ -83,6 +83,19 @@
     },
 
     {
+        "backtrace_size",
+        {BACKTRACE_SPECIFIC_SIZES, &Config::SetBacktraceSize},
+    },
+    {
+        "backtrace_min_size",
+        {BACKTRACE_SPECIFIC_SIZES, &Config::SetBacktraceMinSize},
+    },
+    {
+        "backtrace_max_size",
+        {BACKTRACE_SPECIFIC_SIZES, &Config::SetBacktraceMaxSize},
+    },
+
+    {
         "backtrace",
         {BACKTRACE | TRACK_ALLOCS, &Config::SetBacktrace},
     },
@@ -297,6 +310,23 @@
   return true;
 }
 
+bool Config::SetBacktraceSize(const std::string& option, const std::string& value) {
+  if (!ParseValue(option, value, 1, SIZE_MAX, &backtrace_min_size_bytes_)) {
+    return false;
+  }
+  backtrace_max_size_bytes_ = backtrace_min_size_bytes_;
+
+  return true;
+}
+
+bool Config::SetBacktraceMinSize(const std::string& option, const std::string& value) {
+  return ParseValue(option, value, 1, SIZE_MAX, &backtrace_min_size_bytes_);
+}
+
+bool Config::SetBacktraceMaxSize(const std::string& option, const std::string& value) {
+  return ParseValue(option, value, 1, SIZE_MAX, &backtrace_max_size_bytes_);
+}
+
 bool Config::SetExpandAlloc(const std::string& option, const std::string& value) {
   return ParseValue(option, value, DEFAULT_EXPAND_BYTES, 1, MAX_EXPAND_BYTES, &expand_alloc_bytes_);
 }
@@ -403,6 +433,8 @@
   backtrace_enabled_ = false;
   backtrace_dump_on_exit_ = false;
   backtrace_dump_prefix_ = DEFAULT_BACKTRACE_DUMP_PREFIX;
+  backtrace_min_size_bytes_ = 0;
+  backtrace_max_size_bytes_ = SIZE_MAX;
   check_unreachable_signal_ = SIGRTMAX - 16;
 
   // Process each option name we can find.