1 #include <msp/core/raii.h>
2 #include <msp/strings/format.h>
3 #include <msp/strings/utils.h>
6 #include "programcompiler.h"
13 const char builtins_src[] =
15 "out gl_PerVertex {\n"
16 " vec4 gl_Position;\n"
17 " float gl_ClipDistance[];\n"
21 " vec4 gl_Position;\n"
22 " float gl_ClipDistance[];\n"
24 "out gl_PerVertex {\n"
25 " vec4 gl_Position;\n"
26 " float gl_ClipDistance[];\n"
34 using namespace ProgramSyntax;
36 ProgramCompiler::ProgramCompiler():
40 void ProgramCompiler::compile(const string &source)
42 module = &parser.parse(source);
46 void ProgramCompiler::compile(IO::Base &io)
48 module = &parser.parse(io);
52 void ProgramCompiler::add_shaders(Program &program)
55 throw invalid_operation("ProgramCompiler::add_shaders");
57 string head = "#version 150\n";
58 for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); ++i)
61 program.attach_shader_owned(new VertexShader(head+apply<Formatter>(*i)));
62 else if(i->type==GEOMETRY)
63 program.attach_shader_owned(new GeometryShader(head+apply<Formatter>(*i)));
64 else if(i->type==FRAGMENT)
65 program.attach_shader_owned(new FragmentShader(head+apply<Formatter>(*i)));
68 program.bind_attribute(VERTEX4, "vertex");
69 program.bind_attribute(NORMAL3, "normal");
70 program.bind_attribute(COLOR4_FLOAT, "color");
71 program.bind_attribute(TEXCOORD4, "texcoord");
74 Module *ProgramCompiler::create_builtins_module()
77 Module *module = new Module(parser.parse(builtins_src));
78 for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); ++i)
80 VariableResolver resolver;
81 i->content.visit(resolver);
82 for(map<string, VariableDeclaration *>::iterator j=i->content.variables.begin(); j!=i->content.variables.end(); ++j)
83 j->second->linked_declaration = j->second;
88 Module &ProgramCompiler::get_builtins_module()
90 static RefPtr<Module> builtins_module = create_builtins_module();
91 return *builtins_module;
94 Stage *ProgramCompiler::get_builtins(StageType type)
96 Module &module = get_builtins_module();
97 for(list<Stage>::iterator i=module.stages.begin(); i!=module.stages.end(); ++i)
103 void ProgramCompiler::process()
105 for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); ++i)
107 for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); )
110 i = module->stages.begin();
116 void ProgramCompiler::generate(Stage &stage)
118 inject_block(stage.content, module->shared.content);
120 apply<VariableResolver>(stage);
121 apply<InterfaceGenerator>(stage);
122 apply<VariableResolver>(stage);
123 apply<VariableRenamer>(stage);
126 bool ProgramCompiler::optimize(Stage &stage)
128 set<Node *> unused = apply<UnusedVariableLocator>(stage);
129 apply<NodeRemover>(stage, unused);
131 return !unused.empty();
134 void ProgramCompiler::inject_block(Block &target, const Block &source)
136 list<NodePtr<Node> >::iterator insert_point = target.body.begin();
137 for(list<NodePtr<Node> >::const_iterator i=source.body.begin(); i!=source.body.end(); ++i)
138 target.body.insert(insert_point, (*i)->clone());
142 typename T::ResultType ProgramCompiler::apply(Stage &stage)
145 visitor.apply(stage);
146 return visitor.get_result();
149 template<typename T, typename A>
150 typename T::ResultType ProgramCompiler::apply(Stage &stage, const A &arg)
153 visitor.apply(stage);
154 return visitor.get_result();
158 ProgramCompiler::Visitor::Visitor():
162 void ProgramCompiler::Visitor::apply(Stage &s)
164 SetForScope<Stage *> set(stage, &s);
165 stage->content.visit(*this);
169 ProgramCompiler::Formatter::Formatter():
171 parameter_list(false),
175 void ProgramCompiler::Formatter::visit(Literal &literal)
177 formatted += literal.token;
180 void ProgramCompiler::Formatter::visit(ParenthesizedExpression &parexpr)
183 parexpr.expression->visit(*this);
187 void ProgramCompiler::Formatter::visit(VariableReference &var)
189 formatted += var.name;
192 void ProgramCompiler::Formatter::visit(MemberAccess &memacc)
194 memacc.left->visit(*this);
195 formatted += format(".%s", memacc.member);
198 void ProgramCompiler::Formatter::visit(UnaryExpression &unary)
201 formatted += unary.oper;
202 unary.expression->visit(*this);
204 formatted += unary.oper;
207 void ProgramCompiler::Formatter::visit(BinaryExpression &binary)
209 binary.left->visit(*this);
210 formatted += binary.oper;
211 binary.right->visit(*this);
212 formatted += binary.after;
215 void ProgramCompiler::Formatter::visit(Assignment &assign)
217 assign.left->visit(*this);
218 formatted += format(" %s ", assign.oper);
219 assign.right->visit(*this);
222 void ProgramCompiler::Formatter::visit(FunctionCall &call)
224 formatted += format("%s(", call.name);
225 for(vector<NodePtr<Expression> >::iterator i=call.arguments.begin(); i!=call.arguments.end(); ++i)
227 if(i!=call.arguments.begin())
234 void ProgramCompiler::Formatter::visit(ExpressionStatement &expr)
236 expr.expression->visit(*this);
240 void ProgramCompiler::Formatter::visit(Block &block)
245 unsigned brace_indent = indent;
246 bool use_braces = (block.use_braces || (indent && block.body.size()!=1));
248 formatted += format("%s{\n", string(brace_indent*2, ' '));
250 SetForScope<unsigned> set(indent, indent+!formatted.empty());
251 string spaces(indent*2, ' ');
252 for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); ++i)
254 if(i!=block.body.begin())
262 formatted += format("\n%s}", string(brace_indent*2, ' '));
265 void ProgramCompiler::Formatter::visit(Layout &layout)
267 formatted += "layout(";
268 for(vector<Layout::Qualifier>::const_iterator i=layout.qualifiers.begin(); i!=layout.qualifiers.end(); ++i)
270 if(i!=layout.qualifiers.begin())
272 formatted += i->identifier;
273 if(!i->value.empty())
274 formatted += format("=%s", i->value);
276 formatted += format(") %s;", layout.interface);
279 void ProgramCompiler::Formatter::visit(StructDeclaration &strct)
281 formatted += format("struct %s\n", strct.name);
282 strct.members.visit(*this);
286 void ProgramCompiler::Formatter::visit(VariableDeclaration &var)
289 formatted += "const ";
290 if(!var.sampling.empty())
291 formatted += format("%s ", var.sampling);
292 if(!var.interface.empty() && var.interface!=block_interface)
293 formatted += format("%s ", var.interface);
294 formatted += format("%s %s", var.type, var.name);
299 var.array_size->visit(*this);
302 if(var.init_expression)
305 var.init_expression->visit(*this);
311 void ProgramCompiler::Formatter::visit(InterfaceBlock &iface)
313 SetForScope<string> set(block_interface, iface.interface);
314 formatted += format("%s %s\n", iface.interface, iface.name);
315 iface.members.visit(*this);
319 void ProgramCompiler::Formatter::visit(FunctionDeclaration &func)
321 formatted += format("%s %s(", func.return_type, func.name);
322 for(vector<NodePtr<VariableDeclaration> >::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
324 if(i!=func.parameters.begin())
326 SetFlag set(parameter_list);
333 func.body.visit(*this);
339 void ProgramCompiler::Formatter::visit(Conditional &cond)
342 formatted.replace(formatted.rfind('\n'), string::npos, 1, ' ');
347 cond.condition->visit(*this);
350 cond.body.visit(*this);
351 if(!cond.else_body.body.empty())
353 formatted += format("\n%selse\n", string(indent*2, ' '));
354 SetForScope<unsigned> set(else_if, 2);
355 cond.else_body.visit(*this);
359 void ProgramCompiler::Formatter::visit(Iteration &iter)
362 iter.init_statement->visit(*this);
364 iter.condition->visit(*this);
366 iter.loop_expression->visit(*this);
368 iter.body.visit(*this);
371 void ProgramCompiler::Formatter::visit(Return &ret)
373 formatted += "return ";
374 ret.expression->visit(*this);
379 ProgramCompiler::VariableResolver::VariableResolver():
381 record_target(false),
382 assignment_target(0),
383 self_referencing(false)
386 void ProgramCompiler::VariableResolver::apply(Stage &s)
388 SetForScope<Stage *> set(stage, &s);
389 Stage *builtins = get_builtins(stage->type);
391 blocks.push_back(&builtins->content);
392 stage->content.visit(*this);
397 void ProgramCompiler::VariableResolver::visit(Block &block)
399 blocks.push_back(&block);
400 block.variables.clear();
401 TraversingVisitor::visit(block);
405 void ProgramCompiler::VariableResolver::visit(VariableReference &var)
409 for(vector<Block *>::iterator i=blocks.end(); i!=blocks.begin(); )
412 map<string, VariableDeclaration *>::iterator j = (*i)->variables.find(var.name);
413 if(j!=(*i)->variables.end())
415 var.declaration = j->second;
416 type = j->second->type_declaration;
423 if(assignment_target)
425 record_target = false;
426 assignment_target = 0;
429 assignment_target = var.declaration;
431 else if(var.declaration && var.declaration==assignment_target)
432 self_referencing = true;
435 void ProgramCompiler::VariableResolver::visit(MemberAccess &memacc)
438 TraversingVisitor::visit(memacc);
439 memacc.declaration = 0;
442 map<string, VariableDeclaration *>::iterator i = type->members.variables.find(memacc.member);
443 if(i!=type->members.variables.end())
445 memacc.declaration = i->second;
446 type = i->second->type_declaration;
453 void ProgramCompiler::VariableResolver::visit(BinaryExpression &binary)
458 SetForScope<bool> set(record_target, false);
459 binary.right->visit(*this);
462 binary.left->visit(*this);
466 TraversingVisitor::visit(binary);
471 void ProgramCompiler::VariableResolver::visit(Assignment &assign)
474 SetFlag set(record_target);
475 assignment_target = 0;
476 assign.left->visit(*this);
479 self_referencing = false;
480 assign.right->visit(*this);
482 assign.self_referencing = (self_referencing || assign.oper!="=");
483 assign.target_declaration = assignment_target;
486 void ProgramCompiler::VariableResolver::visit(StructDeclaration &strct)
488 TraversingVisitor::visit(strct);
489 blocks.back()->types[strct.name] = &strct;
492 void ProgramCompiler::VariableResolver::visit(VariableDeclaration &var)
494 for(vector<Block *>::iterator i=blocks.end(); i!=blocks.begin(); )
497 map<string, StructDeclaration *>::iterator j = (*i)->types.find(var.type);
498 if(j!=(*i)->types.end())
499 var.type_declaration = j->second;
502 if(!block_interface.empty() && var.interface.empty())
503 var.interface = block_interface;
505 TraversingVisitor::visit(var);
506 blocks.back()->variables[var.name] = &var;
507 if(anonymous && blocks.size()>1)
508 blocks[blocks.size()-2]->variables[var.name] = &var;
511 void ProgramCompiler::VariableResolver::visit(InterfaceBlock &iface)
513 SetFlag set(anonymous);
514 SetForScope<string> set2(block_interface, iface.interface);
515 TraversingVisitor::visit(iface);
519 ProgramCompiler::InterfaceGenerator::InterfaceGenerator():
524 string ProgramCompiler::InterfaceGenerator::get_out_prefix(StageType type)
528 else if(type==GEOMETRY)
534 void ProgramCompiler::InterfaceGenerator::apply(Stage &s)
536 SetForScope<Stage *> set(stage, &s);
538 in_prefix = get_out_prefix(stage->previous->type);
539 out_prefix = get_out_prefix(stage->type);
540 stage->content.visit(*this);
543 void ProgramCompiler::InterfaceGenerator::visit(Block &block)
545 SetForScope<unsigned> set(scope_level, scope_level+1);
546 for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
552 for(map<string, VariableDeclaration *>::iterator j=iface_declarations.begin(); j!=iface_declarations.end(); ++j)
554 list<NodePtr<Node> >::iterator k = block.body.insert(i, j->second);
557 iface_declarations.clear();
560 for(list<Node *>::iterator j=insert_nodes.begin(); j!=insert_nodes.end(); ++j)
561 block.body.insert(i, *j);
562 insert_nodes.clear();
565 block.body.erase(i++);
572 string ProgramCompiler::InterfaceGenerator::change_prefix(const string &name, const string &prefix) const
574 unsigned offset = (name.compare(0, in_prefix.size(), in_prefix) ? 0 : in_prefix.size());
575 return prefix+name.substr(offset);
578 bool ProgramCompiler::InterfaceGenerator::generate_interface(VariableDeclaration &var, const string &iface, const string &name)
580 const map<string, VariableDeclaration *> &stage_vars = (iface=="in" ? stage->in_variables : stage->out_variables);
581 if(stage_vars.count(name) || iface_declarations.count(name))
584 VariableDeclaration* iface_var = new VariableDeclaration;
585 iface_var->sampling = var.sampling;
586 iface_var->interface = iface;
587 iface_var->type = var.type;
588 iface_var->type_declaration = var.type_declaration;
589 iface_var->name = name;
590 if(stage->type==GEOMETRY)
591 iface_var->array = ((var.array && var.interface!="in") || iface=="in");
593 iface_var->array = var.array;
595 iface_var->array_size = var.array_size;
597 iface_var->linked_declaration = &var;
598 iface_declarations[name] = iface_var;
603 void ProgramCompiler::InterfaceGenerator::insert_assignment(const string &left, ProgramSyntax::Expression *right)
605 Assignment *assign = new Assignment;
606 VariableReference *ref = new VariableReference;
610 assign->right = right;
612 ExpressionStatement *stmt = new ExpressionStatement;
613 stmt->expression = assign;
614 insert_nodes.push_back(stmt);
617 void ProgramCompiler::InterfaceGenerator::visit(VariableReference &var)
619 if(var.declaration || !stage->previous)
621 if(iface_declarations.count(var.name))
624 const map<string, VariableDeclaration *> &prev_out = stage->previous->out_variables;
625 map<string, VariableDeclaration *>::const_iterator i = prev_out.find(var.name);
626 if(i==prev_out.end())
627 i = prev_out.find(in_prefix+var.name);
628 if(i!=prev_out.end())
629 generate_interface(*i->second, "in", var.name);
632 void ProgramCompiler::InterfaceGenerator::visit(VariableDeclaration &var)
634 if(var.interface=="out")
637 stage->out_variables[var.name] = &var;
638 else if(generate_interface(var, "out", change_prefix(var.name, string())))
641 if(var.init_expression)
642 insert_assignment(var.name, var.init_expression->clone());
645 else if(var.interface=="in")
647 stage->in_variables[var.name] = &var;
648 if(var.linked_declaration)
649 var.linked_declaration->linked_declaration = &var;
650 else if(stage->previous)
652 const map<string, VariableDeclaration *> &prev_out = stage->previous->out_variables;
653 map<string, VariableDeclaration *>::const_iterator i = prev_out.find(var.name);
654 if(i!=prev_out.end())
656 var.linked_declaration = i->second;
657 i->second->linked_declaration = &var;
662 TraversingVisitor::visit(var);
665 void ProgramCompiler::InterfaceGenerator::visit(Passthrough &pass)
667 vector<VariableDeclaration *> pass_vars;
669 for(map<string, VariableDeclaration *>::const_iterator i=stage->in_variables.begin(); i!=stage->in_variables.end(); ++i)
670 pass_vars.push_back(i->second);
671 for(map<string, VariableDeclaration *>::const_iterator i=iface_declarations.begin(); i!=iface_declarations.end(); ++i)
672 if(i->second->interface=="in")
673 pass_vars.push_back(i->second);
677 const map<string, VariableDeclaration *> &prev_out = stage->previous->out_variables;
678 for(map<string, VariableDeclaration *>::const_iterator i=prev_out.begin(); i!=prev_out.end(); ++i)
681 for(vector<VariableDeclaration *>::const_iterator j=pass_vars.begin(); (!linked && j!=pass_vars.end()); ++j)
682 linked = ((*j)->linked_declaration==i->second);
684 if(!linked && generate_interface(*i->second, "in", i->second->name))
685 pass_vars.push_back(i->second);
689 if(stage->type==GEOMETRY)
691 VariableReference *ref = new VariableReference;
694 BinaryExpression *subscript = new BinaryExpression;
695 subscript->left = ref;
696 subscript->oper = "[";
697 subscript->right = pass.subscript;
698 subscript->after = "]";
700 MemberAccess *memacc = new MemberAccess;
701 memacc->left = subscript;
702 memacc->member = "gl_Position";
704 insert_assignment("gl_Position", memacc);
707 for(vector<VariableDeclaration *>::const_iterator i=pass_vars.begin(); i!=pass_vars.end(); ++i)
709 string out_name = change_prefix((*i)->name, out_prefix);
710 generate_interface(**i, "out", out_name);
712 VariableReference *ref = new VariableReference;
713 ref->name = (*i)->name;
716 BinaryExpression *subscript = new BinaryExpression;
717 subscript->left = ref;
718 subscript->oper = "[";
719 subscript->right = pass.subscript;
720 subscript->after = "]";
721 insert_assignment(out_name, subscript);
724 insert_assignment(out_name, ref);
731 void ProgramCompiler::VariableRenamer::visit(VariableReference &var)
734 var.name = var.declaration->name;
737 void ProgramCompiler::VariableRenamer::visit(VariableDeclaration &var)
739 if(var.linked_declaration)
740 var.name = var.linked_declaration->name;
741 TraversingVisitor::visit(var);
745 ProgramCompiler::UnusedVariableLocator::UnusedVariableLocator():
748 assignment_target(false)
751 void ProgramCompiler::UnusedVariableLocator::apply(Stage &s)
753 assignments.push_back(BlockAssignmentMap());
755 assignments.pop_back();
758 void ProgramCompiler::UnusedVariableLocator::visit(VariableReference &var)
760 unused_nodes.erase(var.declaration);
762 map<VariableDeclaration *, Node *>::iterator i = aggregates.find(var.declaration);
763 if(i!=aggregates.end())
764 unused_nodes.erase(i->second);
766 if(assignment_target)
769 for(vector<BlockAssignmentMap>::iterator j=assignments.end(); j!=assignments.begin(); )
772 BlockAssignmentMap::iterator k = j->find(var.declaration);
775 for(vector<Node *>::iterator l=k->second.nodes.begin(); l!=k->second.nodes.end(); ++l)
776 unused_nodes.erase(*l);
783 void ProgramCompiler::UnusedVariableLocator::visit(MemberAccess &memacc)
785 TraversingVisitor::visit(memacc);
786 unused_nodes.erase(memacc.declaration);
789 void ProgramCompiler::UnusedVariableLocator::visit(BinaryExpression &binary)
793 binary.left->visit(*this);
794 SetForScope<bool> set(assignment_target, false);
795 binary.right->visit(*this);
798 TraversingVisitor::visit(binary);
801 void ProgramCompiler::UnusedVariableLocator::visit(Assignment &assign)
804 SetForScope<bool> set(assignment_target, !assign.self_referencing);
805 assign.left->visit(*this);
807 assign.right->visit(*this);
808 assignment = &assign;
811 void ProgramCompiler::UnusedVariableLocator::record_assignment(VariableDeclaration &var, Node &node, bool self_ref)
813 unused_nodes.insert(&node);
814 BlockAssignmentMap &block_assignments = assignments.back();
815 AssignmentList &var_assignments = block_assignments[&var];
817 var_assignments.nodes.clear();
818 var_assignments.nodes.push_back(&node);
819 var_assignments.conditional = false;
820 var_assignments.self_referencing = self_ref;
823 void ProgramCompiler::UnusedVariableLocator::visit(ExpressionStatement &expr)
826 TraversingVisitor::visit(expr);
827 if(assignment && assignment->target_declaration)
828 record_assignment(*assignment->target_declaration, expr, assignment->self_referencing);
831 void ProgramCompiler::UnusedVariableLocator::visit(StructDeclaration &strct)
833 SetForScope<Node *> set(aggregate, &strct);
834 unused_nodes.insert(&strct);
835 TraversingVisitor::visit(strct);
838 void ProgramCompiler::UnusedVariableLocator::visit(VariableDeclaration &var)
841 aggregates[&var] = aggregate;
844 unused_nodes.insert(&var);
845 if(var.init_expression)
846 record_assignment(var, *var.init_expression, false);
848 unused_nodes.erase(var.type_declaration);
849 TraversingVisitor::visit(var);
852 void ProgramCompiler::UnusedVariableLocator::visit(InterfaceBlock &iface)
854 SetForScope<Node *> set(aggregate, &iface);
855 unused_nodes.insert(&iface);
856 TraversingVisitor::visit(iface);
859 void ProgramCompiler::UnusedVariableLocator::visit(FunctionDeclaration &func)
861 assignments.push_back(BlockAssignmentMap());
863 for(vector<NodePtr<VariableDeclaration> >::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
865 func.body.visit(*this);
867 BlockAssignmentMap &block_assignments = assignments.back();
868 for(map<string, VariableDeclaration *>::iterator i=func.body.variables.begin(); i!=func.body.variables.end(); ++i)
869 block_assignments.erase(i->second);
870 for(BlockAssignmentMap::iterator i=block_assignments.begin(); i!=block_assignments.end(); ++i)
872 if(i->first->interface=="out" && stage->type!=FRAGMENT && !i->first->linked_declaration)
875 for(vector<Node *>::iterator j=i->second.nodes.begin(); j!=i->second.nodes.end(); ++j)
876 unused_nodes.erase(*j);
879 assignments.pop_back();
882 void ProgramCompiler::UnusedVariableLocator::merge_down_assignments()
884 BlockAssignmentMap &parent_assignments = assignments[assignments.size()-2];
885 BlockAssignmentMap &block_assignments = assignments.back();
886 for(BlockAssignmentMap::iterator i=block_assignments.begin(); i!=block_assignments.end(); ++i)
888 BlockAssignmentMap::iterator j = parent_assignments.find(i->first);
889 if(j==parent_assignments.end())
890 parent_assignments.insert(*i);
891 else if(i->second.self_referencing || i->second.conditional)
893 j->second.nodes.insert(j->second.nodes.end(), i->second.nodes.begin(), i->second.nodes.end());
894 j->second.conditional |= i->second.conditional;
895 j->second.self_referencing |= i->second.self_referencing;
898 j->second = i->second;
900 assignments.pop_back();
903 void ProgramCompiler::UnusedVariableLocator::visit(Conditional &cond)
905 cond.condition->visit(*this);
906 assignments.push_back(BlockAssignmentMap());
907 cond.body.visit(*this);
909 BlockAssignmentMap if_assignments;
910 swap(assignments.back(), if_assignments);
911 cond.else_body.visit(*this);
913 BlockAssignmentMap &else_assignments = assignments.back();
914 for(BlockAssignmentMap::iterator i=else_assignments.begin(); i!=else_assignments.end(); ++i)
916 BlockAssignmentMap::iterator j = if_assignments.find(i->first);
917 if(j!=if_assignments.end())
919 i->second.nodes.insert(i->second.nodes.end(), j->second.nodes.begin(), j->second.nodes.end());
920 i->second.conditional |= j->second.conditional;
921 i->second.self_referencing |= j->second.self_referencing;
922 if_assignments.erase(j);
925 i->second.conditional = true;
928 for(BlockAssignmentMap::iterator i=if_assignments.begin(); i!=if_assignments.end(); ++i)
930 i->second.conditional = true;
931 else_assignments.insert(*i);
934 merge_down_assignments();
937 void ProgramCompiler::UnusedVariableLocator::visit(Iteration &iter)
939 assignments.push_back(BlockAssignmentMap());
940 TraversingVisitor::visit(iter);
941 merge_down_assignments();
945 ProgramCompiler::NodeRemover::NodeRemover(const set<Node *> &r):
949 void ProgramCompiler::NodeRemover::visit(Block &block)
951 for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
954 if(to_remove.count(&**i))
955 block.body.erase(i++);
961 void ProgramCompiler::NodeRemover::visit(VariableDeclaration &var)
963 if(to_remove.count(&var))
965 stage->in_variables.erase(var.name);
966 stage->out_variables.erase(var.name);
967 if(var.linked_declaration)
968 var.linked_declaration->linked_declaration = 0;
970 else if(var.init_expression && to_remove.count(&*var.init_expression))
971 var.init_expression = 0;