iorap: add compiler for perfetto TracePackets

Compile perfetto TracePacket protobufs (which contain Ftraces):

Front-end:
* Parse the perfetto protobufs, extracting the mm events

Resolver:
* Convert inodes to filename paths

Compiler:
* Lower ftrace events to simpler compiler IR
* Merge multiple IR events into a single event
* Greedily reorder IR events to optimize latency

  $> iorap.cmd.compiler --output-proto <output-filename.pb> \
                        trace_packet1.pb trace_packet2.pb [...]

Bug: 72170747
Change-Id: I9ca6677e0cbd4818ec9c4392d9fd47fa23d67f67

1 files changed, 83 insertions, 0 deletions

diff --git a/Android.bp b/Android.bp
index 6d335a6..c433508 100644
--- a/Android.bp
+++ b/Android.bp
@@ -111,11 +111,13 @@ cc_library_static {
         include_dirs: ["frameworks/native/aidl/binder"],
         export_aidl_headers: true,
     },
+
     static_libs: [
        "libplatformprotos",  // android framework C++ protos.
     ],
 }
 
+
 cc_defaults {
     name: "libiorap-manager-default-dependencies",
     static_libs: [
@@ -293,3 +295,84 @@ cc_binary {
     "perfetto_trace_protos",
   ],
 }
+
+// Static libraries cannot export their dependencies,
+// the current convention is to use an extra 'defaults' rule for statics
+// to bring in all the dependencies.
+cc_defaults {
+    name: "libiorap-compiler-default-dependencies",
+
+    defaults: [
+        // use the perfetto namespace
+        "libiorap-perfetto-default-dependencies"
+        // use the inode2filename namespace
+    ],
+
+    // Some of the libperfetto header typedefs leak out into iorap.
+    // Avoids compilation #include errors.
+    // TODO: clean this up, the headers should not leak out (maybe all we need is a PerfettoConsumer
+    // forward declaration?).
+    include_dirs: [],
+    // Various perfetto protos are used directly by iorap.
+    //
+    // Furthermore, we need this regardless to avoid linking errors when linking
+    // libiorap-compiler.a into the main cc_binary rule.
+    static_libs: [
+        "libiorap-perfetto",
+        // "perfetto_trace_protos",
+        "libiorap-inode2filename",
+    ],
+
+    shared_libs: [
+        // Not part of true dependencies: Users of 'libiorap-compiler' do not link against
+        // libperfetto.
+        // We only put this to avoid linking errors when building iorapd.
+        // TODO: can we split iorapd into libiorapd-main that doesn't link against libperfetto?
+        // only the last cc_binary should need the full transitive closure of the dependency graph.
+    ]
+}
+
+cc_library_static {
+    name: "libiorap-compiler",
+    defaults: [
+        "iorap-default-flags",
+        "iorap-default-dependencies",
+        "libiorap-compiler-default-dependencies",
+    ],
+
+    srcs: [
+        "src/compiler/**/*.cc",
+    ],
+}
+
+cc_binary {
+  name: "iorap.cmd.compiler",
+  defaults: [
+      "iorap-default-flags",
+      "iorap-default-dependencies",
+      "libiorap-compiler-default-dependencies",
+  ],
+  shared_libs: [],
+  include_dirs: [],
+  srcs: [
+      "src/compiler/**/*.cc",
+  ],
+  // Easier debugging. TODO: make a separate debug config.
+  // XX: Using -O0 seems to completely hide some errors.
+  cflags: ["-O2", "-UNDEBUG", "-DIORAP_COMPILER_MAIN=1"],
+  sanitize: {
+    undefined: true,
+    all_undefined: true,
+    // Pretty print when ubsan detects a problem.
+    // Otherwise it just calls abort().
+
+/*
+    diag: {
+      undefined: true,
+    },
+    */ // don't use the diag when you want it to crash.
+  },
+
+  static_libs: [
+  ],
+}