mirror of https://github.com/YosysHQ/yosys.git
361 lines
8.0 KiB
C++
361 lines
8.0 KiB
C++
/*
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* yosys -- Yosys Open SYnthesis Suite
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*
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* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* ---
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*
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* The Verilog frontend.
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*
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* This frontend is using the AST frontend library (see frontends/ast/).
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* Thus this frontend does not generate RTLIL code directly but creates an
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* AST directly from the Verilog parse tree and then passes this AST to
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* the AST frontend library.
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*
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* ---
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*
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* Ad-hoc implementation of a Verilog preprocessor. The directives `define,
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* `include, `ifdef, `ifndef, `else and `endif are handled here. All other
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* directives are handled by the lexer (see lexer.l).
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*
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*/
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#include "verilog_frontend.h"
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#include "kernel/log.h"
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <list>
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static std::list<std::string> output_code;
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static std::list<std::string> input_buffer;
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static size_t input_buffer_charp;
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static void return_char(char ch)
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{
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if (input_buffer_charp == 0)
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input_buffer.push_front(std::string() + ch);
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else
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input_buffer.front()[--input_buffer_charp] = ch;
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}
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static void insert_input(std::string str)
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{
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if (input_buffer_charp != 0) {
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input_buffer.front() = input_buffer.front().substr(input_buffer_charp);
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input_buffer_charp = 0;
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}
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input_buffer.push_front(str);
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}
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static char next_char()
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{
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if (input_buffer.size() == 0)
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return 0;
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assert(input_buffer_charp <= input_buffer.front().size());
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if (input_buffer_charp == input_buffer.front().size()) {
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input_buffer_charp = 0;
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input_buffer.pop_front();
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return next_char();
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}
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char ch = input_buffer.front()[input_buffer_charp++];
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return ch == '\r' ? next_char() : ch;
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}
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static void skip_spaces()
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{
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while (1) {
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char ch = next_char();
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if (ch == 0)
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break;
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if (ch != ' ' && ch != '\t') {
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return_char(ch);
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break;
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}
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}
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}
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static std::string next_token(bool pass_newline = false)
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{
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std::string token;
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char ch = next_char();
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if (ch == 0)
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return token;
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token += ch;
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if (ch == '\n') {
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if (pass_newline) {
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output_code.push_back(token);
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return "";
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}
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return token;
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}
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if (ch == ' ' || ch == '\t')
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{
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while ((ch = next_char()) != 0) {
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if (ch != ' ' && ch != '\t') {
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return_char(ch);
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break;
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}
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token += ch;
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}
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}
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else if (ch == '"')
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{
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while ((ch = next_char()) != 0) {
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token += ch;
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if (ch == '"')
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break;
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if (ch == '\\') {
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if ((ch = next_char()) != 0)
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token += ch;
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}
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}
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}
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else if (ch == '/')
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{
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if ((ch = next_char()) != 0) {
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if (ch == '/') {
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token += '*';
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char last_ch = 0;
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while ((ch = next_char()) != 0) {
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if (ch == '\n') {
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return_char(ch);
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break;
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}
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if (last_ch != '*' || ch != '/') {
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token += ch;
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last_ch = ch;
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}
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}
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token += " */";
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}
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else if (ch == '*') {
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token += '*';
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int newline_count = 0;
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char last_ch = 0;
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while ((ch = next_char()) != 0) {
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if (ch == '\n') {
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newline_count++;
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token += ' ';
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} else
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token += ch;
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if (last_ch == '*' && ch == '/')
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break;
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last_ch = ch;
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}
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while (newline_count-- > 0)
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return_char('\n');
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}
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else
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return_char(ch);
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}
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}
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else
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{
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const char *ok = "abcdefghijklmnopqrstuvwxyz_ABCDEFGHIJKLMNOPQRSTUVWXYZ$0123456789";
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while ((ch = next_char()) != 0) {
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if (strchr(ok, ch) == NULL) {
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return_char(ch);
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break;
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}
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token += ch;
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}
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}
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return token;
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}
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static void input_file(FILE *f, std::string filename)
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{
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char buffer[513];
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int rc;
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insert_input("");
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auto it = input_buffer.begin();
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input_buffer.insert(it, "`file_push " + filename + "\n");
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while ((rc = fread(buffer, 1, sizeof(buffer)-1, f)) > 0) {
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buffer[rc] = 0;
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input_buffer.insert(it, buffer);
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}
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input_buffer.insert(it, "`file_pop\n");
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}
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static std::string define_to_feature(std::string defname)
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{
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if (defname == "__YOSYS_ENABLE_DEFATTR__")
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return "defattr";
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return std::string();
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}
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std::string frontend_verilog_preproc(FILE *f, std::string filename)
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{
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std::map<std::string, std::string> defines_map;
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int ifdef_fail_level = 0;
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output_code.clear();
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input_buffer.clear();
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input_buffer_charp = 0;
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input_file(f, filename);
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defines_map["__YOSYS__"] = "1";
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while (!input_buffer.empty())
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{
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std::string tok = next_token();
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// printf("token: >>%s<<\n", tok != "\n" ? tok.c_str() : "NEWLINE");
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if (tok == "`endif") {
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if (ifdef_fail_level > 0)
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ifdef_fail_level--;
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continue;
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}
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if (tok == "`else") {
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if (ifdef_fail_level == 0)
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ifdef_fail_level = 1;
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else if (ifdef_fail_level == 1)
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ifdef_fail_level = 0;
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continue;
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}
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if (tok == "`ifdef") {
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skip_spaces();
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std::string name = next_token(true);
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if (ifdef_fail_level > 0 || defines_map.count(name) == 0)
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ifdef_fail_level++;
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continue;
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}
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if (tok == "`ifndef") {
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skip_spaces();
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std::string name = next_token(true);
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if (ifdef_fail_level > 0 || defines_map.count(name) != 0)
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ifdef_fail_level++;
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continue;
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}
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if (ifdef_fail_level > 0) {
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if (tok == "\n")
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output_code.push_back(tok);
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continue;
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}
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if (tok == "`include") {
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skip_spaces();
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std::string fn = next_token(true);
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while (1) {
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size_t pos = fn.find('"');
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if (pos == std::string::npos)
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break;
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if (pos == 0)
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fn = fn.substr(1);
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else
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fn = fn.substr(0, pos) + fn.substr(pos+1);
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}
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FILE *fp = fopen(fn.c_str(), "r");
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if (fp == NULL && fn.size() > 0 && fn[0] != '/' && filename.find('/') != std::string::npos) {
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std::string fn2 = filename.substr(0, filename.rfind('/')+1) + fn;
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fp = fopen(fn2.c_str(), "r");
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}
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if (fp != NULL) {
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input_file(fp, fn);
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fclose(fp);
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} else
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output_code.push_back("`file_notfound " + fn + "\n");
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continue;
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}
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if (tok == "`define") {
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std::string name, value;
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skip_spaces();
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name = next_token(true);
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if (!define_to_feature(name).empty())
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output_code.push_back("`yosys_enable_" + define_to_feature(name));
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skip_spaces();
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int newline_count = 0;
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while (!tok.empty()) {
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tok = next_token();
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if (tok == "\n") {
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return_char('\n');
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break;
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}
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if (tok == "\\") {
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char ch = next_char();
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if (ch == '\n') {
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value += " ";
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newline_count++;
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} else {
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value += std::string("\\");
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return_char(ch);
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}
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} else
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value += tok;
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}
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while (newline_count-- > 0)
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return_char('\n');
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// printf("define: >>%s<< -> >>%s<<\n", name.c_str(), value.c_str());
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defines_map[name] = value;
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continue;
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}
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if (tok == "`undef") {
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std::string name;
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skip_spaces();
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name = next_token(true);
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if (!define_to_feature(name).empty())
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output_code.push_back("`yosys_disable_" + define_to_feature(name));
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// printf("undef: >>%s<<\n", name.c_str());
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defines_map.erase(name);
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continue;
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}
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if (tok == "`timescale") {
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std::string name;
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skip_spaces();
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while (!tok.empty() && tok != "\n")
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tok = next_token(true);
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if (tok == "\n")
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return_char('\n');
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continue;
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}
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if (tok.size() > 1 && tok[0] == '`' && defines_map.count(tok.substr(1)) > 0) {
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// printf("expand: >>%s<< -> >>%s<<\n", tok.c_str(), defines_map[tok.substr(1)].c_str());
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insert_input(defines_map[tok.substr(1)]);
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continue;
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}
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output_code.push_back(tok);
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}
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std::string output;
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for (auto &str : output_code)
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output += str;
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output_code.clear();
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input_buffer.clear();
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input_buffer_charp = 0;
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return output;
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}
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