1 #include <msp/core/raii.h>
2 #include <msp/strings/format.h>
3 #include <msp/strings/regex.h>
4 #include "programparser.h"
13 using namespace ProgramSyntax;
15 ProgramParser::Operator ProgramParser::operators[] =
17 { "[", 2, BINARY, LEFT_TO_RIGHT },
18 { "(", 2, BINARY, LEFT_TO_RIGHT },
19 { ".", 2, BINARY, LEFT_TO_RIGHT },
20 { "++", 2, POSTFIX, LEFT_TO_RIGHT },
21 { "--", 2, POSTFIX, LEFT_TO_RIGHT },
22 { "++", 3, PREFIX, RIGHT_TO_LEFT },
23 { "--", 3, PREFIX, RIGHT_TO_LEFT },
24 { "+", 3, PREFIX, RIGHT_TO_LEFT },
25 { "-", 3, PREFIX, RIGHT_TO_LEFT },
26 { "~", 3, PREFIX, RIGHT_TO_LEFT },
27 { "!", 3, PREFIX, RIGHT_TO_LEFT },
28 { "*", 4, BINARY, LEFT_TO_RIGHT },
29 { "/", 4, BINARY, LEFT_TO_RIGHT },
30 { "%", 4, BINARY, LEFT_TO_RIGHT },
31 { "+", 5, BINARY, LEFT_TO_RIGHT },
32 { "-", 5, BINARY, LEFT_TO_RIGHT },
33 { "<<", 6, BINARY, LEFT_TO_RIGHT },
34 { ">>", 6, BINARY, LEFT_TO_RIGHT },
35 { "<", 7, BINARY, LEFT_TO_RIGHT },
36 { ">", 7, BINARY, LEFT_TO_RIGHT },
37 { "<=", 7, BINARY, LEFT_TO_RIGHT },
38 { ">=", 7, BINARY, LEFT_TO_RIGHT },
39 { "==", 8, BINARY, LEFT_TO_RIGHT },
40 { "!=", 8, BINARY, LEFT_TO_RIGHT },
41 { "&", 9, BINARY, LEFT_TO_RIGHT },
42 { "^", 10, BINARY, LEFT_TO_RIGHT },
43 { "|", 11, BINARY, LEFT_TO_RIGHT },
44 { "&&", 12, BINARY, LEFT_TO_RIGHT },
45 { "^^", 13, BINARY, LEFT_TO_RIGHT },
46 { "||", 14, BINARY, LEFT_TO_RIGHT },
47 { "?", 15, BINARY, RIGHT_TO_LEFT },
48 { ":", 15, BINARY, RIGHT_TO_LEFT },
49 { "=", 16, BINARY, RIGHT_TO_LEFT },
50 { "+=", 16, BINARY, RIGHT_TO_LEFT },
51 { "-=", 16, BINARY, RIGHT_TO_LEFT },
52 { "*=", 16, BINARY, RIGHT_TO_LEFT },
53 { "/=", 16, BINARY, RIGHT_TO_LEFT },
54 { "%=", 16, BINARY, RIGHT_TO_LEFT },
55 { "<<=", 16, BINARY, RIGHT_TO_LEFT },
56 { ">>=", 16, BINARY, RIGHT_TO_LEFT },
57 { "&=", 16, BINARY, RIGHT_TO_LEFT },
58 { "^=", 16, BINARY, RIGHT_TO_LEFT },
59 { "|=", 16, BINARY, RIGHT_TO_LEFT },
60 { ",", 17, BINARY, LEFT_TO_RIGHT },
61 { { 0 }, 18, NO_OPERATOR, LEFT_TO_RIGHT }
64 ProgramParser::ProgramParser():
68 ProgramParser::~ProgramParser()
73 Module &ProgramParser::parse(const string &s, const string &n)
81 Module &ProgramParser::parse(IO::Base &io, const string &n)
88 unsigned len = io.read(buffer, sizeof(buffer));
89 source.append(buffer, len);
95 void ProgramParser::parse_source()
99 string::size_type slashes = source.find("//////");
100 if(slashes==string::npos)
103 string::size_type newline = source.find('\n', slashes);
104 string pragma = format("#pragma MSP stage(%s)", source.substr(slashes+6, newline-slashes-6));
105 source.replace(slashes, newline-slashes, pragma);
110 cur_stage = &module->shared;
111 iter = source.begin();
112 source_end = source.end();
114 allow_preprocess = true;
115 while(RefPtr<Node> statement = parse_global_declaration())
116 cur_stage->content.body.push_back(statement);
119 string ProgramParser::format_error(const std::string &message)
121 string location = format("%s:%d: ", source_name, current_line);
122 return location+message;
125 string ProgramParser::format_syntax_error(const std::string &expected)
127 return format_error(format("Syntax error at '%s': expected %s", last_token, expected));
130 const string &ProgramParser::peek_token(unsigned index)
132 while(next_tokens.size()<=index)
133 next_tokens.push_back(parse_token_());
134 return (last_token = next_tokens[index]);
137 const string &ProgramParser::parse_token()
139 if(!next_tokens.empty())
141 last_token = next_tokens.front();
142 next_tokens.pop_front();
146 return (last_token = parse_token_());
149 string ProgramParser::parse_token_()
153 skip_comment_and_whitespace();
156 else if(allow_preprocess && *iter=='#')
158 allow_preprocess = false;
159 SetForScope<deque<string> > clear_tokens(next_tokens, deque<string>());
162 else if(isalpha(*iter) || *iter=='_')
163 return parse_identifier();
164 else if(isdigit(*iter))
165 return parse_number();
167 return parse_other();
171 string ProgramParser::parse_identifier()
174 while(iter!=source_end)
176 if(isalnum(*iter) || *iter=='_')
185 string ProgramParser::parse_number()
187 bool accept_sign = false;
189 while(iter!=source_end)
191 if(isdigit(*iter) || *iter=='.')
193 else if(*iter=='e' || *iter=='E')
198 else if(accept_sign && (*iter=='+' || *iter=='-'))
207 string ProgramParser::parse_other()
212 string token(1, *iter++);
213 for(unsigned i=1; (i<3 && iter!=source_end); ++i)
215 bool matched = false;
216 for(const Operator *j=operators; (!matched && j->type); ++j)
218 matched = (j->token[i]==*iter);
219 for(unsigned k=0; (matched && k<i && j->token[k]); ++k)
220 matched = (j->token[k]==token[k]);
232 void ProgramParser::skip_comment_and_whitespace()
234 unsigned comment = 0;
235 while(iter!=source_end)
241 else if(!isspace(*iter))
262 else if(comment==3 && *iter=='*')
275 allow_preprocess = (comment<3);
282 void ProgramParser::expect(const string &token)
284 string parsed = parse_token();
286 throw runtime_error(format_syntax_error(format("'%s'", token)));
289 string ProgramParser::expect_type()
291 string token = parse_token();
293 throw runtime_error(format_syntax_error("a type"));
297 string ProgramParser::expect_identifier()
299 string token = parse_token();
300 if(!is_identifier(token))
301 throw runtime_error(format_syntax_error("an identifier"));
305 bool ProgramParser::check(const string &token)
307 bool result = (peek_token()==token);
313 bool ProgramParser::is_interface_qualifier(const string &token)
315 return (token=="uniform" || token=="in" || token=="out");
318 bool ProgramParser::is_sampling_qualifier(const string &token)
320 return (token=="centroid" || token=="sample");
323 bool ProgramParser::is_interpolation_qualifier(const string &token)
325 return (token=="smooth" || token=="flat" || token=="noperspective");
328 bool ProgramParser::is_precision_qualifier(const string &token)
330 return (token=="highp" || token=="mediump" || token=="lowp");
333 bool ProgramParser::is_qualifier(const string &token)
335 return (token=="const" ||
336 is_interface_qualifier(token) ||
337 is_sampling_qualifier(token) ||
338 is_interpolation_qualifier(token) ||
339 is_precision_qualifier(token));
342 bool ProgramParser::is_builtin_type(const string &token)
344 static Regex re("^(void|float|int|bool|[ib]?vec[234]|mat[234](x[234])?|sampler((1D|2D)(Array)?(Shadow)?|Cube(Shadow)?|3D))$");
345 return re.match(token);
348 bool ProgramParser::is_type(const string &token)
350 return is_builtin_type(token) || declared_types.count(token);
353 bool ProgramParser::is_identifier(const string &token)
355 static Regex re("^[a-zA-Z_][a-zA-Z0-9_]*$");
356 return re.match(token);
359 void ProgramParser::preprocess()
363 string::const_iterator line_end = iter;
364 for(; (line_end!=source_end && *line_end!='\n'); ++line_end) ;
365 SetForScope<string::const_iterator> stop_at_line_end(source_end, line_end);
367 string token = peek_token();
370 else if(token=="define" || token=="undef" || token=="if" || token=="ifdef" || token=="ifndef" || token=="else" ||
371 token=="elif" || token=="endif" || token=="error" || token=="extension" || token=="version" || token=="line")
372 throw runtime_error(format_error(format("Unsupported preprocessor directive '%s'", token)));
373 else if(!token.empty())
374 throw runtime_error(format_syntax_error("a preprocessor directive"));
379 void ProgramParser::preprocess_pragma()
382 string token = parse_token();
384 preprocess_pragma_msp();
387 void ProgramParser::preprocess_pragma_msp()
389 string token = peek_token();
393 throw runtime_error(format_error(format("Unrecognized MSP pragma '%s'", token)));
395 token = parse_token();
397 throw runtime_error(format_syntax_error("end of line"));
400 void ProgramParser::preprocess_stage()
402 if(!allow_stage_change)
403 throw runtime_error(format_error("Changing stage not allowed here"));
407 string token = expect_identifier();
408 StageType stage = SHARED;
411 else if(token=="geometry")
413 else if(token=="fragment")
416 throw runtime_error(format_syntax_error("stage identifier"));
419 if(stage<=cur_stage->type)
420 throw runtime_error(format_error(format("Stage '%s' not allowed here", token)));
422 module->stages.push_back(stage);
424 if(cur_stage->type!=SHARED)
425 module->stages.back().previous = cur_stage;
426 cur_stage = &module->stages.back();
429 RefPtr<Node> ProgramParser::parse_global_declaration()
431 allow_stage_change = true;
432 string token = peek_token();
433 allow_stage_change = false;
436 return parse_import();
437 else if(token=="precision")
438 return parse_precision();
439 else if(token=="layout")
441 RefPtr<Layout> layout = parse_layout();
442 token = peek_token();
443 if(is_interface_qualifier(token) && peek_token(1)==";")
445 RefPtr<InterfaceLayout> iface_lo = new InterfaceLayout;
446 iface_lo->layout.qualifiers = layout->qualifiers;
447 iface_lo->interface = parse_token();
453 RefPtr<VariableDeclaration> var = parse_variable_declaration();
454 var->layout = layout;
458 else if(token=="struct")
459 return parse_struct_declaration();
460 else if(is_interface_qualifier(token))
462 string next = peek_token(1);
463 if(is_type(next) || is_qualifier(next))
464 return parse_variable_declaration();
466 return parse_interface_block();
468 else if(is_qualifier(token))
469 return parse_variable_declaration();
470 else if(is_type(token))
472 if(peek_token(2)=="(")
473 return parse_function_declaration();
475 return parse_variable_declaration();
477 else if(token.empty())
480 throw runtime_error(format_syntax_error("a global declaration"));
483 RefPtr<Node> ProgramParser::parse_statement()
485 string token = peek_token();
487 return parse_conditional();
488 else if(token=="for")
490 else if(token=="while")
491 return parse_while();
492 else if(token=="passthrough")
493 return parse_passthrough();
494 else if(token=="return")
495 return parse_return();
496 else if(token=="break" || token=="continue" || token=="discard")
498 RefPtr<Jump> jump = new Jump;
499 jump->keyword = parse_token();
504 else if(is_qualifier(token) || is_type(token))
505 return parse_variable_declaration();
506 else if(!token.empty())
508 RefPtr<ExpressionStatement> expr = new ExpressionStatement;
509 expr->expression = parse_expression();
515 throw runtime_error(format_syntax_error("a statement"));
518 RefPtr<Import> ProgramParser::parse_import()
520 if(cur_stage->type!=SHARED)
521 throw runtime_error(format_error("Imports are only allowed in the shared section"));
524 RefPtr<Import> import = new Import;
525 import->module = parse_token();
530 RefPtr<Precision> ProgramParser::parse_precision()
533 RefPtr<Precision> precision = new Precision;
535 precision->precision = parse_token();
536 if(!is_precision_qualifier(precision->precision))
537 throw runtime_error(format_syntax_error("a precision qualifier"));
539 precision->type = parse_token();
540 // Not entirely accurate; only float, int and sampler types are allowed
541 if(!is_builtin_type(precision->type))
542 throw runtime_error(format_syntax_error("a builtin type"));
549 RefPtr<Layout> ProgramParser::parse_layout()
553 RefPtr<Layout> layout = new Layout;
556 string token = parse_token();
558 throw runtime_error(format_syntax_error("a layout qualifier name"));
560 layout->qualifiers.push_back(Layout::Qualifier());
561 Layout::Qualifier &qual = layout->qualifiers.back();
562 qual.identifier = token;
565 qual.value = parse_token();
567 if(peek_token()==")")
577 void ProgramParser::parse_block(Block &block, bool require_braces)
579 bool have_braces = (require_braces || peek_token()=="{");
585 while(peek_token()!="}")
586 block.body.push_back(parse_statement());
589 block.body.push_back(parse_statement());
591 block.use_braces = (require_braces || block.body.size()!=1);
597 RefPtr<Expression> ProgramParser::parse_expression(unsigned precedence)
599 RefPtr<Expression> left;
600 VariableReference *left_var = 0;
603 string token = peek_token();
605 const Operator *oper = 0;
606 for(Operator *i=operators; (!oper && i->type); ++i)
607 if(token==i->token && (!left || i->type!=PREFIX) && (left || i->type!=POSTFIX))
610 if(token==";" || token==")" || token=="]" || token=="," || (oper && precedence && oper->precedence>=precedence))
615 throw runtime_error(format_syntax_error("an expression"));
622 throw runtime_error(format_error("Syntax error before '(': function name must be an identifier"));
623 left = parse_function_call(*left_var);
627 RefPtr<MemberAccess> memacc = new MemberAccess;
630 memacc->member = expect_identifier();
633 else if(oper && oper->type==POSTFIX)
635 RefPtr<UnaryExpression> unary = new UnaryExpression;
636 unary->oper = parse_token();
637 unary->prefix = false;
638 unary->expression = left;
641 else if(oper && oper->type==BINARY)
642 left = parse_binary(left, oper);
644 throw runtime_error(format_syntax_error("an operator"));
652 RefPtr<ParenthesizedExpression> parexpr = new ParenthesizedExpression;
653 parexpr->expression = parse_expression();
657 else if(isdigit(token[0]) || token=="true" || token=="false")
659 RefPtr<Literal> literal = new Literal;
660 literal->token = parse_token();
663 else if(is_identifier(token))
665 RefPtr<VariableReference> var = new VariableReference;
666 var->name = expect_identifier();
668 left_var = var.get();
670 else if(oper && oper->type==PREFIX)
672 RefPtr<UnaryExpression> unary = new UnaryExpression;
673 unary->oper = parse_token();
674 unary->prefix = true;
675 unary->expression = parse_expression(oper->precedence);
679 throw runtime_error(format_syntax_error("an expression"));
684 RefPtr<BinaryExpression> ProgramParser::parse_binary(const RefPtr<Expression> &left, const Operator *oper)
686 RefPtr<BinaryExpression> binary = (oper->precedence==16 ? new Assignment : new BinaryExpression);
688 binary->oper = parse_token();
689 if(binary->oper=="[")
691 binary->right = parse_expression();
696 binary->right = parse_expression(oper->precedence+(oper->assoc==RIGHT_TO_LEFT));
700 RefPtr<FunctionCall> ProgramParser::parse_function_call(const VariableReference &var)
702 RefPtr<FunctionCall> call = new FunctionCall;
703 call->name = var.name;
704 call->constructor = is_type(call->name);
706 while(peek_token()!=")")
708 if(!call->arguments.empty())
710 call->arguments.push_back(parse_expression());
716 RefPtr<StructDeclaration> ProgramParser::parse_struct_declaration()
719 RefPtr<StructDeclaration> strct = new StructDeclaration;
721 strct->name = expect_identifier();
722 parse_block(strct->members, true);
725 declared_types.insert(strct->name);
729 RefPtr<VariableDeclaration> ProgramParser::parse_variable_declaration()
731 RefPtr<VariableDeclaration> var = new VariableDeclaration;
733 string token = peek_token();
734 while(is_qualifier(token))
737 if(is_interface_qualifier(token))
738 var->interface = token;
739 else if(is_sampling_qualifier(token))
740 var->sampling = token;
741 else if(is_interpolation_qualifier(token))
742 var->interpolation = token;
743 else if(is_precision_qualifier(token))
744 var->precision = token;
745 else if(token=="const")
746 var->constant = true;
747 token = peek_token();
750 var->type = expect_type();
751 var->name = expect_identifier();
758 var->array_size = parse_expression();
764 var->init_expression = parse_expression();
770 RefPtr<FunctionDeclaration> ProgramParser::parse_function_declaration()
772 RefPtr<FunctionDeclaration> func = new FunctionDeclaration;
774 func->return_type = expect_type();
775 func->name = expect_identifier();
777 while(peek_token()!=")")
779 if(!func->parameters.empty())
782 RefPtr<VariableDeclaration> var = new VariableDeclaration;
783 string token = peek_token();
784 if(token=="in" || token=="out" || token=="inout")
785 var->interface = parse_token();
786 var->type = expect_type();
787 var->name = expect_identifier();
788 func->parameters.push_back(var);
792 string token = peek_token();
795 func->definition = func.get();
796 parse_block(func->body, true);
801 throw runtime_error(format_syntax_error("'{' or ';'"));
806 RefPtr<InterfaceBlock> ProgramParser::parse_interface_block()
808 RefPtr<InterfaceBlock> iface = new InterfaceBlock;
810 iface->interface = parse_token();
811 if(!is_interface_qualifier(iface->interface))
812 throw runtime_error(format_syntax_error("an interface qualifier"));
814 iface->name = expect_identifier();
815 parse_block(iface->members, true);
818 iface->instance_name = expect_identifier();
830 RefPtr<Conditional> ProgramParser::parse_conditional()
834 RefPtr<Conditional> cond = new Conditional;
835 cond->condition = parse_expression();
838 parse_block(cond->body, false);
840 string token = peek_token();
844 parse_block(cond->else_body, false);
850 RefPtr<Iteration> ProgramParser::parse_for()
854 RefPtr<Iteration> loop = new Iteration;
855 string token = peek_token();
857 loop->init_statement = parse_statement();
862 RefPtr<ExpressionStatement> expr = new ExpressionStatement;
863 expr->expression = parse_expression();
864 loop->init_statement = expr;
868 if(peek_token()!=";")
869 loop->condition = parse_expression();
871 if(peek_token()!=")")
872 loop->loop_expression = parse_expression();
875 parse_block(loop->body, false);
880 RefPtr<Iteration> ProgramParser::parse_while()
884 RefPtr<Iteration> loop = new Iteration;
885 loop->condition = parse_expression();
888 parse_block(loop->body, false);
893 RefPtr<Passthrough> ProgramParser::parse_passthrough()
895 expect("passthrough");
896 RefPtr<Passthrough> pass = new Passthrough;
897 if(cur_stage->type==GEOMETRY)
900 pass->subscript = parse_expression();
907 RefPtr<Return> ProgramParser::parse_return()
910 RefPtr<Return> ret = new Return;
911 if(peek_token()!=";")
912 ret->expression = parse_expression();