0021-Fallback-to-synthesizing-a-debug-id-from-version-and.patch

From 87b47575d002f2a542a408490b5f7c963cb43dc9 Mon Sep 17 00:00:00 2001
From: Jon TURNEY <jon.turney@dronecode.org.uk>
Date: Thu, 16 Oct 2014 00:53:55 +0100
Subject: [PATCH 21/24] Fallback to synthesizing a debug-id from version and
 architecture, if possible

Based on an idea by Ivan Gubarev

Ideally there would be a similar change in PeCoffFileIdentifierFromMappedFile(),
but that is not written yet...

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
---
 src/processor/minidump.cc | 32 +++++++++++++++++++++++++++++---
 1 file changed, 29 insertions(+), 3 deletions(-)

diff --git a/src/processor/minidump.cc b/src/processor/minidump.cc
index fe86478..c143e89 100644
--- a/src/processor/minidump.cc
+++ b/src/processor/minidump.cc
@@ -2044,9 +2044,35 @@ string MinidumpModule::debug_identifier() const {
 
   // TODO(mmentovai): on the Mac, provide fallbacks as in code_identifier().
 
-  // XXX: PE generated with gcc don't currently have CV records, so the Windows
-  // minidumper can't record any identifier information, so there's no useful
-  // identifier for us to match with.  Fallback to a default debug_identifier.
+  // If possible, synthesize a debug_identifier from the version and
+  // architecture.
+  if (identifier.empty()) {
+    std::string ver = version();
+    if (ver.compare("") != 0) {
+      identifier = "";
+      for (std::string::const_iterator i = ver.begin(); i != ver.end(); i++) {
+        if (isxdigit(*i)) {
+          identifier += *i;
+        }
+      }
+
+      MinidumpSystemInfo *minidump_system_info = minidump_->GetSystemInfo();
+      if (minidump_system_info) {
+        std::string cpu = minidump_system_info->GetCPU();
+        for (std::string::const_iterator i = cpu.begin(); i != cpu.end(); i++) {
+          char ashex[4];
+          snprintf(ashex, sizeof(ashex), "%02x", *i);
+          identifier += ashex;
+        }
+      }
+
+      while (identifier.size() < 33) {
+        identifier += "0";
+      }
+    }
+  }
+
+  // Fallback to a default debug_identifier
   if (identifier.empty())
   {
     identifier = "000000000000000000000000000000000";
-- 
2.1.1