Emugen : A tool to generate wire protocol code
Emugen is a tool that can be used to generate code that deals with marshaling/unmarshaling request to/from a wire-protocol. Its input is an API defintion files and its output is C++ source code for the client (caller) and the server (callee) sides. See README file for more details. This submission is resubmission of code that lived under sdk/emulator/opengl/. However, it also includes minor updates in ApiGen.cpp Change-Id: I0ede7448e0a0e26fa0fbc5590d07d1f2f6566f0a
This commit is contained in:
Jacky Romano
335
tools/emulator/opengl/host/tools/emugen/EntryPoint.cpp
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335
tools/emulator/opengl/host/tools/emugen/EntryPoint.cpp
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/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include "EntryPoint.h"
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#include <string>
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#include "TypeFactory.h"
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#include "strUtils.h"
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#include <sstream>
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EntryPoint::EntryPoint()
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{
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reset();
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}
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EntryPoint::~EntryPoint()
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{
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}
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void EntryPoint::reset()
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{
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m_unsupported = false;
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m_customDecoder = false;
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m_vars.empty();
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}
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bool parseTypeField(const std::string & f, std::string *vartype, bool *pointer_type, std::string *varname)
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{
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size_t pos = 0, last;
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bool done = false;
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*vartype = "";
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if (varname != NULL) *varname = "";
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*pointer_type = false;
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enum { ST_TYPE, ST_NAME, ST_END } state = ST_TYPE;
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while(!done) {
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std::string str = getNextToken(f, pos, &last, WHITESPACE);
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if (str.size() == 0) break;
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switch(state) {
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case ST_TYPE:
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if (str == "const") {
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pos = last;
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} else {
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// must be a type name;
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*vartype = str;
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// do we have an astriks at the end of the name?
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if (vartype->at(vartype->size() - 1) == '*') {
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*pointer_type = true;
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// remove the astriks
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(*vartype)[vartype->size() - 1] = ' ';
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*vartype = trim(*vartype);
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}
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state = ST_NAME;
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pos = last;
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}
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break;
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case ST_NAME:
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if (str.size() == 0) {
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done = true;
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} else if (str == "*") {
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*pointer_type = true;
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// remove the leading astriks;
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pos = last;
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} else if (varname == NULL) {
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done = true;
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} else {
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if (str[0] == '*') {
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*pointer_type = true;
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str[0] = ' ';
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str = trim(str);
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}
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*varname = str;
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done = true;
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}
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break;
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case ST_END:
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break;
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}
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}
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return true;
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}
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// return true for valid line (need to get into the entry points list)
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bool EntryPoint::parse(unsigned int lc, const std::string & str)
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{
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size_t pos, last;
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std::string field;
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reset();
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std::string linestr = trim(str);
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if (linestr.size() == 0) return false;
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if (linestr.at(0) == '#') return false;
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// skip PREFIX
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field = getNextToken(linestr, 0, &last, "(");
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pos = last + 1;
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// return type
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field = getNextToken(linestr, pos, &last, ",)");
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std::string retTypeName;
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bool pointer_type;
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if (!parseTypeField(field, &retTypeName, &pointer_type, NULL)) {
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fprintf(stderr, "line: %d: Parsing error in field <%s>\n", lc, field.c_str());
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return false;
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}
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pos = last + 1;
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const VarType *theType = TypeFactory::instance()->getVarTypeByName(retTypeName);
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if (theType->name() == "UNKNOWN") {
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fprintf(stderr, "UNKNOWN retval: %s\n", linestr.c_str());
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}
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m_retval.init(std::string(""), theType, pointer_type, std::string(""), Var::POINTER_OUT, std::string(""));
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// function name
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m_name = getNextToken(linestr, pos, &last, ",)");
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pos = last + 1;
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// parameters;
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int nvars = 0;
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while (pos < linestr.size() - 1) {
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field = getNextToken(linestr, pos, &last, ",)");
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std::string vartype, varname;
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if (!parseTypeField(field, &vartype, &pointer_type, &varname)) {
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fprintf(stderr, "line: %d: Parsing error in field <%s>\n", lc, field.c_str());
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return false;
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}
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nvars++;
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const VarType *v = TypeFactory::instance()->getVarTypeByName(vartype);
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if (v->id() == 0) {
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fprintf(stderr, "%d: Unknown type: %s\n", lc, vartype.c_str());
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} else {
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if (varname == "" &&
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!(v->name() == "void" && !pointer_type)) {
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std::ostringstream oss;
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oss << "var" << nvars;
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varname = oss.str();
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}
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m_vars.push_back(Var(varname, v, pointer_type, std::string(""), Var::POINTER_IN, ""));
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}
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pos = last + 1;
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}
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return true;
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}
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void EntryPoint::print(FILE *fp, bool newline,
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const std::string & name_suffix,
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const std::string & name_prefix,
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const std::string & ctx_param ) const
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{
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fprintf(fp, "%s%s %s%s%s(",
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m_retval.type()->name().c_str(),
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m_retval.isPointer() ? "*" : "",
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name_prefix.c_str(),
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m_name.c_str(),
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name_suffix.c_str());
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if (ctx_param != "") fprintf(fp, "%s ", ctx_param.c_str());
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for (size_t i = 0; i < m_vars.size(); i++) {
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if (m_vars[i].isVoid()) continue;
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if (i != 0 || ctx_param != "") fprintf(fp, ", ");
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fprintf(fp, "%s %s%s", m_vars[i].type()->name().c_str(),
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m_vars[i].isPointer() ? "*" : "",
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m_vars[i].name().c_str());
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}
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fprintf(fp, ")%s", newline? "\n" : "");
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}
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Var * EntryPoint::var(const std::string & name)
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{
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Var *v = NULL;
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for (size_t i = 0; i < m_vars.size(); i++) {
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if (m_vars[i].name() == name) {
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v = &m_vars[i];
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break;
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}
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}
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return v;
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}
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bool EntryPoint::hasPointers()
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{
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bool pointers = false;
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if (m_retval.isPointer()) pointers = true;
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if (!pointers) {
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for (size_t i = 0; i < m_vars.size(); i++) {
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if (m_vars[i].isPointer()) {
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pointers = true;
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break;
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}
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}
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}
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return pointers;
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}
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int EntryPoint::setAttribute(const std::string &line, size_t lc)
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{
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size_t pos = 0;
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size_t last;
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std::string token = getNextToken(line, 0, &last, WHITESPACE);
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if (token == "len") {
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pos = last;
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std::string varname = getNextToken(line, pos, &last, WHITESPACE);
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if (varname.size() == 0) {
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fprintf(stderr, "ERROR: %u: Missing variable name in 'len' attribute\n", (unsigned int)lc);
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return -1;
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}
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Var * v = var(varname);
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if (v == NULL) {
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fprintf(stderr, "ERROR: %u: variable %s is not a parameter of %s\n",
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(unsigned int)lc, varname.c_str(), name().c_str());
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return -2;
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}
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// set the size expression into var
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pos = last;
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v->setLenExpression(line.substr(pos));
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} else if (token == "dir") {
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pos = last;
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std::string varname = getNextToken(line, pos, &last, WHITESPACE);
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if (varname.size() == 0) {
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fprintf(stderr, "ERROR: %u: Missing variable name in 'dir' attribute\n", (unsigned int)lc);
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return -1;
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}
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Var * v = var(varname);
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if (v == NULL) {
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fprintf(stderr, "ERROR: %u: variable %s is not a parameter of %s\n",
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(unsigned int)lc, varname.c_str(), name().c_str());
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return -2;
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}
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pos = last;
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std::string pointerDirStr = getNextToken(line, pos, &last, WHITESPACE);
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if (pointerDirStr.size() == 0) {
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fprintf(stderr, "ERROR: %u: missing pointer directions\n", (unsigned int)lc);
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return -3;
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}
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if (pointerDirStr == "out") {
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v->setPointerDir(Var::POINTER_OUT);
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} else if (pointerDirStr == "inout") {
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v->setPointerDir(Var::POINTER_INOUT);
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} else if (pointerDirStr == "in") {
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v->setPointerDir(Var::POINTER_IN);
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} else {
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fprintf(stderr, "ERROR: %u: unknow pointer direction %s\n", (unsigned int)lc, pointerDirStr.c_str());
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}
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} else if (token == "var_flag") {
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pos = last;
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std::string varname = getNextToken(line, pos, &last, WHITESPACE);
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if (varname.size() == 0) {
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fprintf(stderr, "ERROR: %u: Missing variable name in 'var_flag' attribute\n", (unsigned int)lc);
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return -1;
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}
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Var * v = var(varname);
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if (v == NULL) {
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fprintf(stderr, "ERROR: %u: variable %s is not a parameter of %s\n",
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(unsigned int)lc, varname.c_str(), name().c_str());
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return -2;
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}
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pos = last;
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std::string flag = getNextToken(line, pos, &last, WHITESPACE);
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if (flag.size() == 0) {
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fprintf(stderr, "ERROR: %u: missing flag\n", (unsigned int) lc);
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return -3;
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}
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if (flag == "nullAllowed") {
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if (v->isPointer()) {
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v->setNullAllowed(true);
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} else {
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fprintf(stderr, "WARNING: %u: setting nullAllowed for non-pointer variable %s\n",
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(unsigned int) lc, v->name().c_str());
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}
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} else {
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fprintf(stderr, "WARNING: %u: unknow flag %s\n", (unsigned int)lc, flag.c_str());
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}
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} else if (token == "custom_pack") {
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pos = last;
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std::string varname = getNextToken(line, pos, &last, WHITESPACE);
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if (varname.size() == 0) {
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fprintf(stderr, "ERROR: %u: Missing variable name in 'custom_pack' attribute\n", (unsigned int)lc);
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return -1;
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}
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Var * v = var(varname);
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if (v == NULL) {
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fprintf(stderr, "ERROR: %u: variable %s is not a parameter of %s\n",
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(unsigned int)lc, varname.c_str(), name().c_str());
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return -2;
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}
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// set the size expression into var
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pos = last;
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v->setPackExpression(line.substr(pos));
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} else if (token == "flag") {
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pos = last;
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std::string flag = getNextToken(line, pos, &last, WHITESPACE);
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if (flag.size() == 0) {
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fprintf(stderr, "ERROR: %u: missing flag\n", (unsigned int) lc);
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return -4;
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}
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if (flag == "unsupported") {
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setUnsupported(true);
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} else if (flag == "custom_decoder") {
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setCustomDecoder(true);
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} else {
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fprintf(stderr, "WARNING: %u: unknown flag %s\n", (unsigned int)lc, flag.c_str());
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}
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} else {
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fprintf(stderr, "WARNING: %u: unknown attribute %s\n", (unsigned int)lc, token.c_str());
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}
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return 0;
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}
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