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https://github.com/YosysHQ/yosys
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ast: use new format string helpers.
This commit is contained in:
whitequark
Marcelina Kościelnicka
parent
9ea241711e
commit
9f8e039a4b
4 changed files with 48 additions and 161 deletions
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@ -30,6 +30,7 @@
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#define AST_H
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#include "kernel/rtlil.h"
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#include "kernel/fmt.h"
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#include <stdint.h>
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#include <set>
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@ -277,7 +278,7 @@ namespace AST
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bool replace_variables(std::map<std::string, varinfo_t> &variables, AstNode *fcall, bool must_succeed);
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AstNode *eval_const_function(AstNode *fcall, bool must_succeed);
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bool is_simple_const_expr();
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std::string process_format_str(const std::string &sformat, int next_arg, int stage, int width_hint, bool sign_hint);
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Fmt processFormat(int stage, bool sformat_like, int default_base = 10, size_t first_arg_at = 0);
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bool is_recursive_function() const;
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std::pair<AstNode*, AstNode*> get_tern_choice();
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@ -43,141 +43,35 @@ using namespace AST_INTERNAL;
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// Process a format string and arguments for $display, $write, $sprintf, etc
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std::string AstNode::process_format_str(const std::string &sformat, int next_arg, int stage, int width_hint, bool sign_hint) {
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// Other arguments are placeholders. Process the string as we go through it
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std::string sout;
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for (size_t i = 0; i < sformat.length(); i++)
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{
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// format specifier
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if (sformat[i] == '%')
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{
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// If there's no next character, that's a problem
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if (i+1 >= sformat.length())
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input_error("System task `%s' called with `%%' at end of string.\n", str.c_str());
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char cformat = sformat[++i];
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// %% is special, does not need a matching argument
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if (cformat == '%')
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{
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sout += '%';
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continue;
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}
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bool got_len = false;
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bool got_zlen = false;
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int len_value = 0;
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while ('0' <= cformat && cformat <= '9')
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{
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if (!got_len && cformat == '0')
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got_zlen = true;
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got_len = true;
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len_value = 10*len_value + (cformat - '0');
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cformat = sformat[++i];
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}
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// Simplify the argument
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AstNode *node_arg = nullptr;
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// Everything from here on depends on the format specifier
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switch (cformat)
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{
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case 's':
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case 'S':
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case 'd':
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case 'D':
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if (got_len && len_value != 0)
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goto unsupported_format;
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YS_FALLTHROUGH
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case 'x':
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case 'X':
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if (next_arg >= GetSize(children))
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input_error("Missing argument for %%%c format specifier in system task `%s'.\n",
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cformat, str.c_str());
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node_arg = children[next_arg++];
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while (node_arg->simplify(true, false, stage, width_hint, sign_hint, false)) { }
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Fmt AstNode::processFormat(int stage, bool sformat_like, int default_base, size_t first_arg_at) {
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std::vector<VerilogFmtArg> args;
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for (size_t index = first_arg_at; index < children.size(); index++) {
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AstNode *node_arg = children[index];
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while (node_arg->simplify(true, false, stage, -1, false, false)) { }
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if (node_arg->type != AST_CONSTANT)
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input_error("Failed to evaluate system task `%s' with non-constant argument.\n", str.c_str());
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break;
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input_error("Failed to evaluate system task `%s' with non-constant argument at position %zu.\n", str.c_str(), index + 1);
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case 'm':
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case 'M':
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if (got_len)
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goto unsupported_format;
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break;
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case 'l':
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case 'L':
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if (got_len)
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goto unsupported_format;
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break;
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default:
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unsupported_format:
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input_error("System task `%s' called with invalid/unsupported format specifier.\n", str.c_str());
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break;
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VerilogFmtArg arg = {};
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arg.filename = filename;
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arg.first_line = location.first_line;
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if (node_arg->is_string) {
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arg.type = VerilogFmtArg::STRING;
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arg.str = node_arg->bitsAsConst().decode_string();
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// and in case this will be used as an argument...
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arg.sig = node_arg->bitsAsConst();
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arg.signed_ = false;
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} else {
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arg.type = VerilogFmtArg::INTEGER;
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arg.sig = node_arg->bitsAsConst();
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arg.signed_ = node_arg->is_signed;
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}
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args.push_back(arg);
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}
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switch (cformat)
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{
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case 's':
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case 'S':
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sout += node_arg->bitsAsConst().decode_string();
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break;
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case 'd':
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case 'D':
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sout += stringf("%d", node_arg->bitsAsConst().as_int());
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break;
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case 'x':
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case 'X':
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{
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Const val = node_arg->bitsAsConst();
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while (GetSize(val) % 4 != 0)
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val.bits.push_back(State::S0);
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int len = GetSize(val) / 4;
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for (int i = len; i < len_value; i++)
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sout += got_zlen ? '0' : ' ';
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for (int i = len-1; i >= 0; i--) {
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Const digit = val.extract(4*i, 4);
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if (digit.is_fully_def())
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sout += stringf(cformat == 'x' ? "%x" : "%X", digit.as_int());
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else
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sout += cformat == 'x' ? "x" : "X";
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Fmt fmt = {};
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fmt.parse_verilog(args, sformat_like, default_base, /*task_name=*/str, current_module->name);
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return fmt;
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}
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}
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break;
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case 'm':
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case 'M':
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sout += log_id(current_module->name);
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break;
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case 'l':
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case 'L':
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sout += log_id(current_module->name);
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break;
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default:
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log_abort();
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}
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}
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// not a format specifier
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else
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sout += sformat[i];
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}
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return sout;
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}
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void AstNode::annotateTypedEnums(AstNode *template_node)
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{
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@ -1057,33 +951,30 @@ bool AstNode::simplify(bool const_fold, bool in_lvalue, int stage, int width_hin
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str = std::string();
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}
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if ((type == AST_TCALL) && (str == "$display" || str == "$write") && (!current_always || current_always->type != AST_INITIAL)) {
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if ((type == AST_TCALL) && (str.substr(0, 8) == "$display" || str.substr(0, 6) == "$write") && (!current_always || current_always->type != AST_INITIAL)) {
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log_file_warning(filename, location.first_line, "System task `%s' outside initial block is unsupported.\n", str.c_str());
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delete_children();
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str = std::string();
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}
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// print messages if this a call to $display() or $write()
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// This code implements only a small subset of Verilog-2005 $display() format specifiers,
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// but should be good enough for most uses
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if ((type == AST_TCALL) && ((str == "$display") || (str == "$write")))
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// print messages if this a call to $display() or $write() family of functions
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if ((type == AST_TCALL) &&
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(str == "$display" || str == "$displayb" || str == "$displayh" || str == "$displayo" ||
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str == "$write" || str == "$writeb" || str == "$writeh" || str == "$writeo"))
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{
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int nargs = GetSize(children);
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if (nargs < 1)
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input_error("System task `%s' got %d arguments, expected >= 1.\n",
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str.c_str(), int(children.size()));
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int default_base = 10;
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if (str.back() == 'b')
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default_base = 2;
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else if (str.back() == 'o')
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default_base = 8;
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else if (str.back() == 'h')
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default_base = 16;
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Fmt fmt = processFormat(stage, /*sformat_like=*/false, default_base);
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if (str.substr(0, 8) == "$display")
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fmt.append_string("\n");
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log("%s", fmt.render().c_str());
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// First argument is the format string
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AstNode *node_string = children[0];
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while (node_string->simplify(true, false, stage, width_hint, sign_hint, false)) { }
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if (node_string->type != AST_CONSTANT)
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input_error("Failed to evaluate system task `%s' with non-constant 1st argument.\n", str.c_str());
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std::string sformat = node_string->bitsAsConst().decode_string();
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std::string sout = process_format_str(sformat, 1, stage, width_hint, sign_hint);
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// Finally, print the message (only include a \n for $display, not for $write)
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log("%s", sout.c_str());
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if (str == "$display")
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log("\n");
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delete_children();
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str = std::string();
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}
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@ -3735,13 +3626,8 @@ skip_dynamic_range_lvalue_expansion:;
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}
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if (str == "\\$sformatf") {
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AstNode *node_string = children[0];
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while (node_string->simplify(true, false, stage, width_hint, sign_hint, false)) { }
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if (node_string->type != AST_CONSTANT)
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input_error("Failed to evaluate system function `%s' with non-constant 1st argument.\n", str.c_str());
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std::string sformat = node_string->bitsAsConst().decode_string();
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std::string sout = process_format_str(sformat, 1, stage, width_hint, sign_hint);
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newNode = AstNode::mkconst_str(sout);
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Fmt fmt = processFormat(stage, /*sformat_like=*/true);
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newNode = AstNode::mkconst_str(fmt.render());
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goto apply_newNode;
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}
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@ -386,7 +386,7 @@ and|nand|or|nor|xor|xnor|not|buf|bufif0|bufif1|notif0|notif1 {
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supply0 { return TOK_SUPPLY0; }
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supply1 { return TOK_SUPPLY1; }
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"$"(display|write|strobe|monitor|time|stop|finish|dumpfile|dumpvars|dumpon|dumpoff|dumpall) {
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"$"(display[bho]?|write[bho]?|strobe|monitor|time|stop|finish|dumpfile|dumpvars|dumpon|dumpoff|dumpall) {
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yylval->string = new std::string(yytext);
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return TOK_ID;
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}
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