Exemplo n.º 1
0
bool
OSLCompilerImpl::compile (const std::string &filename,
                          const std::vector<std::string> &options,
                          const std::string &stdoslpath)
{
    if (! OIIO::Filesystem::exists (filename)) {
        error (ustring(), 0, "Input file \"%s\" not found", filename.c_str());
        return false;
    }

    std::string stdinclude;

#ifdef USE_BOOST_WAVE
    std::vector<std::string> defines;
    std::vector<std::string> includepaths;
#else
    std::string cppoptions;
#endif

    m_cwd = boost::filesystem::initial_path().string();
    m_main_filename = filename;

    // Determine where the installed shader include directory is, and
    // look for ../shaders/stdosl.h and force it to include.
    if (stdoslpath.empty()) {
        std::string program = OIIO::Sysutil::this_program_path ();
        if (program.size()) {
            boost::filesystem::path path (program);  // our program
            path = path.parent_path ();  // now the bin dir of our program
            path = path.parent_path ();  // now the parent dir
            path = path / "shaders";
            bool found = false;
            if (OIIO::Filesystem::exists (path.string())) {
#ifdef USE_BOOST_WAVE
                includepaths.push_back(path.string());
#else
                // pass along to cpp
                cppoptions += "\"-I";
                cppoptions += path.string();
                cppoptions += "\" ";
#endif
                path = path / "stdosl.h";
                if (OIIO::Filesystem::exists (path.string())) {
                    stdinclude = path.string();
                    found = true;
                }
            }
            if (! found)
                warning (ustring(filename), 0, "Unable to find \"%s\"",
                         path.string().c_str());
        }
    }
    else
        stdinclude = stdoslpath;

    m_output_filename.clear ();
    bool preprocess_only = false;
    for (size_t i = 0;  i < options.size();  ++i) {
        if (options[i] == "-v") {
            // verbose mode
            m_verbose = true;
        } else if (options[i] == "-q") {
            // quiet mode
            m_quiet = true;
        } else if (options[i] == "-d") {
            // debug mode
            m_debug = true;
        } else if (options[i] == "-E") {
            preprocess_only = true;
        } else if (options[i] == "-o" && i < options.size()-1) {
            ++i;
            m_output_filename = options[i];
        } else if (options[i] == "-O0") {
            m_optimizelevel = 0;
        } else if (options[i] == "-O" || options[i] == "-O1") {
            m_optimizelevel = 1;
        } else if (options[i] == "-O2") {
            m_optimizelevel = 2;
#ifdef USE_BOOST_WAVE
        } else if (options[i].c_str()[0] == '-' && options[i].size() > 2) {
            // options meant for the preprocessor
            if (options[i].c_str()[1] == 'D' || options[i].c_str()[1] == 'U')
                defines.push_back(options[i].substr(2));
            else if (options[i].c_str()[1] == 'I')
                includepaths.push_back(options[i].substr(2));
#else
        } else {
            // something meant for the cpp command
            cppoptions += "\"";
            cppoptions += options[i];
            cppoptions += "\" ";
#endif
        }
    }

    std::string preprocess_result;

#ifdef USE_BOOST_WAVE
    if (! preprocess(filename, stdinclude, defines, includepaths, preprocess_result)) {
#else
    if (! preprocess(filename, stdinclude, cppoptions, preprocess_result)) {
#endif
        return false;
    } else if (preprocess_only) {
        std::cout << preprocess_result;
    } else {
        std::istringstream in (preprocess_result);
        oslcompiler = this;

        // Create a lexer, parse the file, delete the lexer
        m_lexer = new oslFlexLexer (&in);
        oslparse ();
        bool parseerr = error_encountered();
        delete m_lexer;

        if (! parseerr) {
            if (shader())
                shader()->typecheck ();
            else
                error (ustring(), 0, "No shader function defined");
        }

        // Print the parse tree if there were no errors
        if (m_debug) {
            symtab().print ();
            if (shader())
                shader()->print (std::cout);
        }

        if (! error_encountered()) {
            shader()->codegen ();
//            add_useparam ();
            track_variable_dependencies ();
            track_variable_lifetimes ();
            check_for_illegal_writes ();
//            if (m_optimizelevel >= 1)
//                coalesce_temporaries ();
        }
 
        if (! error_encountered()) {
            if (m_output_filename.size() == 0)
                m_output_filename = default_output_filename ();
            write_oso_file (m_output_filename);
        }

        oslcompiler = NULL;
    }

    return ! error_encountered();
}



struct GlobalTable {
    const char *name;
    TypeSpec type;
};


void
OSLCompilerImpl::initialize_globals ()
{
    static GlobalTable globals[] = {
        { "P", TypeDesc::TypePoint },
        { "I", TypeDesc::TypeVector },
        { "N", TypeDesc::TypeNormal },
        { "Ng", TypeDesc::TypeNormal },
        { "u", TypeDesc::TypeFloat },
        { "v", TypeDesc::TypeFloat },
        { "dPdu", TypeDesc::TypeVector },
        { "dPdv", TypeDesc::TypeVector },
    #if 0
        // Light variables -- we don't seem to be on a route to support this
        // kind of light shader, so comment these out for now.
        { "L", TypeDesc::TypeVector },
        { "Cl", TypeDesc::TypeColor },
        { "Ns", TypeDesc::TypeNormal },
        { "Pl", TypeDesc::TypePoint },
        { "Nl", TypeDesc::TypeNormal },
    #endif
        { "Ps", TypeDesc::TypePoint },
        { "Ci", TypeSpec (TypeDesc::TypeColor, true) },
        { "time", TypeDesc::TypeFloat },
        { "dtime", TypeDesc::TypeFloat },
        { "dPdtime", TypeDesc::TypeVector },
        { NULL }
    };

    for (int i = 0;  globals[i].name;  ++i) {
        Symbol *s = new Symbol (ustring(globals[i].name), globals[i].type,
                                SymTypeGlobal);
        symtab().insert (s);
    }
}



std::string
OSLCompilerImpl::default_output_filename ()
{
    if (m_shader && shader_decl())
        return shader_decl()->shadername().string() + ".oso";
    return std::string();
}



void
OSLCompilerImpl::write_oso_metadata (const ASTNode *metanode) const
{
    ASSERT (metanode->nodetype() == ASTNode::variable_declaration_node);
    const ASTvariable_declaration *metavar = static_cast<const ASTvariable_declaration *>(metanode);
    Symbol *metasym = metavar->sym();
    ASSERT (metasym);
    TypeSpec ts = metasym->typespec();
    oso ("%%meta{%s,%s,", ts.string().c_str(), metasym->name().c_str());
    const ASTNode *init = metavar->init().get();
    ASSERT (init);
    if (ts.is_string() && init->nodetype() == ASTNode::literal_node)
        oso ("\"%s\"", ((const ASTliteral *)init)->strval());
    else if (ts.is_int() && init->nodetype() == ASTNode::literal_node)
        oso ("%d", ((const ASTliteral *)init)->intval());
    else if (ts.is_float() && init->nodetype() == ASTNode::literal_node)
        oso ("%.8g", ((const ASTliteral *)init)->floatval());
    // FIXME -- what about type constructors?
    else {
        std::cout << "Error, don't know how to print metadata " 
                  << ts.string() << " with node type " 
                  << init->nodetypename() << "\n";
        ASSERT (0);  // FIXME
    }
    oso ("} ");
}
void
BackendLLVM::llvm_assign_initial_value (const Symbol& sym)
{
    // Don't write over connections!  Connection values are written into
    // our layer when the earlier layer is run, as part of its code.  So
    // we just don't need to initialize it here at all.
    if (sym.valuesource() == Symbol::ConnectedVal &&
          !sym.typespec().is_closure_based())
        return;
    if (sym.typespec().is_closure_based() && sym.symtype() == SymTypeGlobal)
        return;

    int arraylen = std::max (1, sym.typespec().arraylength());

    // Closures need to get their storage before anything can be
    // assigned to them.  Unless they are params, in which case we took
    // care of it in the group entry point.
    if (sym.typespec().is_closure_based() &&
        sym.symtype() != SymTypeParam && sym.symtype() != SymTypeOutputParam) {
        llvm_assign_zero (sym);
        return;
    }

    if ((sym.symtype() == SymTypeLocal || sym.symtype() == SymTypeTemp)
          && shadingsys().debug_uninit()) {
        // Handle the "debug uninitialized values" case
        bool isarray = sym.typespec().is_array();
        int alen = isarray ? sym.typespec().arraylength() : 1;
        llvm::Value *u = NULL;
        if (sym.typespec().is_closure_based()) {
            // skip closures
        }
        else if (sym.typespec().is_floatbased())
            u = ll.constant (std::numeric_limits<float>::quiet_NaN());
        else if (sym.typespec().is_int_based())
            u = ll.constant (std::numeric_limits<int>::min());
        else if (sym.typespec().is_string_based())
            u = ll.constant (Strings::uninitialized_string);
        if (u) {
            for (int a = 0;  a < alen;  ++a) {
                llvm::Value *aval = isarray ? ll.constant(a) : NULL;
                for (int c = 0;  c < (int)sym.typespec().aggregate(); ++c)
                    llvm_store_value (u, sym, 0, aval, c);
            }
        }
        return;
    }

    if ((sym.symtype() == SymTypeLocal || sym.symtype() == SymTypeTemp) &&
        sym.typespec().is_string_based()) {
        // Strings are pointers.  Can't take any chance on leaving
        // local/tmp syms uninitialized.
        llvm_assign_zero (sym);
        return;  // we're done, the parts below are just for params
    }
    ASSERT_MSG (sym.symtype() == SymTypeParam || sym.symtype() == SymTypeOutputParam,
                "symtype was %d, data type was %s", (int)sym.symtype(), sym.typespec().c_str());

    if (sym.has_init_ops() && sym.valuesource() == Symbol::DefaultVal) {
        // Handle init ops.
        build_llvm_code (sym.initbegin(), sym.initend());
    } else if (! sym.lockgeom() && ! sym.typespec().is_closure()) {
        // geometrically-varying param; memcpy its default value
        TypeDesc t = sym.typespec().simpletype();
        ll.op_memcpy (llvm_void_ptr (sym), ll.constant_ptr (sym.data()),
                      t.size(), t.basesize() /*align*/);
        if (sym.has_derivs())
            llvm_zero_derivs (sym);
    } else {
        // Use default value
        int num_components = sym.typespec().simpletype().aggregate;
        TypeSpec elemtype = sym.typespec().elementtype();
        for (int a = 0, c = 0; a < arraylen;  ++a) {
            llvm::Value *arrind = sym.typespec().is_array() ? ll.constant(a) : NULL;
            if (sym.typespec().is_closure_based())
                continue;
            for (int i = 0; i < num_components; ++i, ++c) {
                // Fill in the constant val
                llvm::Value* init_val = 0;
                if (elemtype.is_floatbased())
                    init_val = ll.constant (((float*)sym.data())[c]);
                else if (elemtype.is_string())
                    init_val = ll.constant (((ustring*)sym.data())[c]);
                else if (elemtype.is_int())
                    init_val = ll.constant (((int*)sym.data())[c]);
                ASSERT (init_val);
                llvm_store_value (init_val, sym, 0, arrind, i);
            }
        }
        if (sym.has_derivs())
            llvm_zero_derivs (sym);
    }

    // Handle interpolated params.
    // FIXME -- really, we shouldn't assign defaults or run init ops if
    // the values are interpolated.  The perf hit is probably small, since
    // there are so few interpolated params, but we should come back and
    // fix this later.
    if ((sym.symtype() == SymTypeParam || sym.symtype() == SymTypeOutputParam)
        && ! sym.lockgeom()) {
        std::vector<llvm::Value*> args;
        args.push_back (sg_void_ptr());
        args.push_back (ll.constant (sym.name()));
        args.push_back (ll.constant (sym.typespec().simpletype()));
        args.push_back (ll.constant ((int) sym.has_derivs()));
        args.push_back (llvm_void_ptr (sym));
        ll.call_function ("osl_bind_interpolated_param",
                          &args[0], args.size());                            
    }
}