clover: Calculate the serialized size of a module efficiently.

Tested-by: Tom Stellard <thomas.stellard@amd.com>

src/gallium/state_trackers/clover/api/program.cpp

@@ -190,10 +190,7 @@ clGetProgramInfo(cl_program d_prog, cl_program_info param,
 
    case CL_PROGRAM_BINARY_SIZES:
       buf.as_vector<size_t>() = map([&](const device &dev) {
-            compat::ostream::buffer_t bin;
+            return prog.binary(dev).size();
-            compat::ostream s(bin);
-            prog.binary(dev).serialize(s);
-            return bin.size();
          },
          prog.devices());
       break;

src/gallium/state_trackers/clover/core/module.cpp

@@ -52,6 +52,13 @@ namespace {
       return x;
    }
 
+   /// Calculate the size of the specified object.
+   template<typename T>
+   void
+   _proc(module::size_t &sz, const T &x) {
+      _serializer<T>::proc(sz, x);
+   }
+
    /// (De)serialize a scalar value.
    template<typename T>
    struct _serializer<T, typename std::enable_if<
@@ -65,6 +72,11 @@ namespace {
       proc(compat::istream &is, T &x) {
          is.read(reinterpret_cast<char *>(&x), sizeof(x));
       }
+
+      static void
+      proc(module::size_t &sz, const T &x) {
+         sz += sizeof(x);
+      }
    };
 
    /// (De)serialize a vector.
@@ -87,6 +99,14 @@ namespace {
          for (size_t i = 0; i < v.size(); i++)
             new(&v[i]) T(_proc<T>(is));
       }
+
+      static void
+      proc(module::size_t &sz, const compat::vector<T> &v) {
+         sz += sizeof(uint32_t);
+
+         for (size_t i = 0; i < v.size(); i++)
+            _proc<T>(sz, v[i]);
+      }
    };
 
    template<typename T>
@@ -106,6 +126,11 @@ namespace {
          is.read(reinterpret_cast<char *>(v.begin()),
                  v.size() * sizeof(T));
       }
+
+      static void
+      proc(module::size_t &sz, const compat::vector<T> &v) {
+         sz += sizeof(uint32_t) + sizeof(T) * v.size();
+      }
    };
 
    /// (De)serialize a module::section.
@@ -170,4 +195,11 @@ namespace clover {
    module::deserialize(compat::istream &is) {
       return _proc<module>(is);
    }
+
+   module::size_t
+   module::size() const {
+      size_t sz = 0;
+      _proc(sz, *this);
+      return sz;
+   }
 }

src/gallium/state_trackers/clover/core/module.hpp

@@ -105,6 +105,7 @@ namespace clover {
 
       void serialize(compat::ostream &os) const;
       static module deserialize(compat::istream &is);
+      size_t size() const;
 
       compat::vector<symbol> syms;
       compat::vector<section> secs;