interceptor: add FixdepAnalyzer

This implements tracing for the fixdep command of kernel builds. In
particular it allows us to run this command in dry-run mode later.

Bug: 205735739
Signed-off-by: Matthias Maennich <maennich@google.com>
Change-Id: I4ea3f41edcd64150be0a890e59356e48de4b036d

1 files changed, 22 insertions, 0 deletions

diff --git a/interceptor.cc b/interceptor.cc
index 1f9f93d..e9efccc 100644
--- a/interceptor.cc
+++ b/interceptor.cc
@@ -272,6 +272,24 @@ class ArchiverAnalyzer : public Analyzer {
   bool should_recurse(Command*) const final { return false; }
 };
 
+class FixdepAnalyzer : public Analyzer {
+  InputsOutputs determine_inputs_outputs(const Command& command) const final {
+    InputsOutputs result;
+    const auto& arguments = command.arguments();
+
+    if (arguments.size() < 3) {
+      return result;
+    }
+
+    // fixdep reads the object file and the .d file and outputs to the .d file
+    result.outputs.push_back(arguments[1]);
+    result.inputs.push_back(arguments[1]);
+    result.inputs.push_back(arguments[2]);
+
+    return result;
+  };
+};
+
 static const std::initializer_list<
     std::pair<std::regex, std::function<std::unique_ptr<Analyzer>()>>>
     analyzers{
@@ -283,6 +301,10 @@ static const std::initializer_list<
             std::regex("^(.*/)?(llvm-)?ar$"),
             []() { return std::make_unique<ArchiverAnalyzer>(); },
         },
+        {
+            std::regex("^scripts/basic/fixdep$"),
+            []() { return std::make_unique<FixdepAnalyzer>(); },
+        },
     };
 
 std::unique_ptr<Analyzer> Analyzer::get(const Command& command) {