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+create_source(*i)));
62 else if(i->type==GEOMETRY)
63 program.attach_shader_owned(new GeometryShader(head+create_source(*i)));
64 else if(i->type==FRAGMENT)
65 program.attach_shader_owned(new FragmentShader(head+create_source(*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 UnusedVariableLocator unused_locator;
129 unused_locator.apply(stage);
132 remover.to_remove = unused_locator.unused_nodes;
133 remover.apply(stage);
135 return !unused_locator.unused_nodes.empty();
138 void ProgramCompiler::inject_block(Block &target, const Block &source)
140 list<NodePtr<Node> >::iterator insert_point = target.body.begin();
141 for(list<NodePtr<Node> >::const_iterator i=source.body.begin(); i!=source.body.end(); ++i)
142 target.body.insert(insert_point, (*i)->clone());
146 void ProgramCompiler::apply(Stage &stage)
149 visitor.apply(stage);
152 string ProgramCompiler::create_source(Stage &stage)
155 formatter.apply(stage);
156 return formatter.formatted;
160 ProgramCompiler::Visitor::Visitor():
164 void ProgramCompiler::Visitor::apply(Stage &s)
166 SetForScope<Stage *> set(stage, &s);
167 stage->content.visit(*this);
171 ProgramCompiler::Formatter::Formatter():
173 parameter_list(false),
177 void ProgramCompiler::Formatter::visit(Literal &literal)
179 formatted += literal.token;
182 void ProgramCompiler::Formatter::visit(ParenthesizedExpression &parexpr)
185 parexpr.expression->visit(*this);
189 void ProgramCompiler::Formatter::visit(VariableReference &var)
191 formatted += var.name;
194 void ProgramCompiler::Formatter::visit(MemberAccess &memacc)
196 memacc.left->visit(*this);
197 formatted += format(".%s", memacc.member);
200 void ProgramCompiler::Formatter::visit(UnaryExpression &unary)
203 formatted += unary.oper;
204 unary.expression->visit(*this);
206 formatted += unary.oper;
209 void ProgramCompiler::Formatter::visit(BinaryExpression &binary)
211 binary.left->visit(*this);
212 formatted += binary.oper;
213 binary.right->visit(*this);
214 formatted += binary.after;
217 void ProgramCompiler::Formatter::visit(Assignment &assign)
219 assign.left->visit(*this);
220 formatted += format(" %s ", assign.oper);
221 assign.right->visit(*this);
224 void ProgramCompiler::Formatter::visit(FunctionCall &call)
226 formatted += format("%s(", call.name);
227 for(vector<NodePtr<Expression> >::iterator i=call.arguments.begin(); i!=call.arguments.end(); ++i)
229 if(i!=call.arguments.begin())
236 void ProgramCompiler::Formatter::visit(ExpressionStatement &expr)
238 expr.expression->visit(*this);
242 void ProgramCompiler::Formatter::visit(Block &block)
247 unsigned brace_indent = indent;
249 formatted += format("%s{\n", string(brace_indent*2, ' '));
251 SetForScope<unsigned> set(indent, indent+!formatted.empty());
252 string spaces(indent*2, ' ');
253 for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); ++i)
255 if(i!=block.body.begin())
263 formatted += format("\n%s}", string(brace_indent*2, ' '));
266 void ProgramCompiler::Formatter::visit(Layout &layout)
268 formatted += "layout(";
269 for(vector<Layout::Qualifier>::const_iterator i=layout.qualifiers.begin(); i!=layout.qualifiers.end(); ++i)
271 if(i!=layout.qualifiers.begin())
273 formatted += i->identifier;
274 if(!i->value.empty())
275 formatted += format("=%s", i->value);
277 formatted += format(") %s;", layout.interface);
280 void ProgramCompiler::Formatter::visit(StructDeclaration &strct)
282 formatted += format("struct %s\n", strct.name);
283 strct.members.visit(*this);
287 void ProgramCompiler::Formatter::visit(VariableDeclaration &var)
290 formatted += "const ";
291 if(!var.sampling.empty())
292 formatted += format("%s ", var.sampling);
293 if(!var.interface.empty() && var.interface!=block_interface)
294 formatted += format("%s ", var.interface);
295 formatted += format("%s %s", var.type, var.name);
300 var.array_size->visit(*this);
303 if(var.init_expression)
306 var.init_expression->visit(*this);
312 void ProgramCompiler::Formatter::visit(InterfaceBlock &iface)
314 SetForScope<string> set(block_interface, iface.interface);
315 formatted += format("%s %s\n", iface.interface, iface.name);
316 iface.members.visit(*this);
320 void ProgramCompiler::Formatter::visit(FunctionDeclaration &func)
322 formatted += format("%s %s(", func.return_type, func.name);
323 for(vector<NodePtr<VariableDeclaration> >::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
325 if(i!=func.parameters.begin())
327 SetFlag set(parameter_list);
334 func.body.visit(*this);
340 void ProgramCompiler::Formatter::visit(Conditional &cond)
343 formatted.replace(formatted.rfind('\n'), string::npos, 1, ' ');
348 cond.condition->visit(*this);
351 cond.body.visit(*this);
352 if(!cond.else_body.body.empty())
354 formatted += format("\n%selse\n", string(indent*2, ' '));
355 SetForScope<unsigned> set(else_if, 2);
356 cond.else_body.visit(*this);
360 void ProgramCompiler::Formatter::visit(Iteration &iter)
363 iter.init_statement->visit(*this);
365 iter.condition->visit(*this);
367 iter.loop_expression->visit(*this);
369 iter.body.visit(*this);
372 void ProgramCompiler::Formatter::visit(Return &ret)
374 formatted += "return ";
375 ret.expression->visit(*this);
380 ProgramCompiler::VariableResolver::VariableResolver():
382 record_target(false),
383 assignment_target(0),
384 self_referencing(false)
387 void ProgramCompiler::VariableResolver::apply(Stage &s)
389 SetForScope<Stage *> set(stage, &s);
390 Stage *builtins = get_builtins(stage->type);
392 blocks.push_back(&builtins->content);
393 stage->content.visit(*this);
398 void ProgramCompiler::VariableResolver::visit(Block &block)
400 blocks.push_back(&block);
401 block.variables.clear();
402 TraversingVisitor::visit(block);
406 void ProgramCompiler::VariableResolver::visit(VariableReference &var)
410 for(vector<Block *>::iterator i=blocks.end(); i!=blocks.begin(); )
413 map<string, VariableDeclaration *>::iterator j = (*i)->variables.find(var.name);
414 if(j!=(*i)->variables.end())
416 var.declaration = j->second;
417 type = j->second->type_declaration;
424 if(assignment_target)
426 record_target = false;
427 assignment_target = 0;
430 assignment_target = var.declaration;
432 else if(var.declaration && var.declaration==assignment_target)
433 self_referencing = true;
436 void ProgramCompiler::VariableResolver::visit(MemberAccess &memacc)
439 TraversingVisitor::visit(memacc);
440 memacc.declaration = 0;
443 map<string, VariableDeclaration *>::iterator i = type->members.variables.find(memacc.member);
444 if(i!=type->members.variables.end())
446 memacc.declaration = i->second;
447 type = i->second->type_declaration;
454 void ProgramCompiler::VariableResolver::visit(BinaryExpression &binary)
459 SetForScope<bool> set(record_target, false);
460 binary.right->visit(*this);
463 binary.left->visit(*this);
467 TraversingVisitor::visit(binary);
472 void ProgramCompiler::VariableResolver::visit(Assignment &assign)
475 SetFlag set(record_target);
476 assignment_target = 0;
477 assign.left->visit(*this);
480 self_referencing = false;
481 assign.right->visit(*this);
483 assign.self_referencing = (self_referencing || assign.oper!="=");
484 assign.target_declaration = assignment_target;
487 void ProgramCompiler::VariableResolver::visit(StructDeclaration &strct)
489 TraversingVisitor::visit(strct);
490 blocks.back()->types[strct.name] = &strct;
493 void ProgramCompiler::VariableResolver::visit(VariableDeclaration &var)
495 for(vector<Block *>::iterator i=blocks.end(); i!=blocks.begin(); )
498 map<string, StructDeclaration *>::iterator j = (*i)->types.find(var.type);
499 if(j!=(*i)->types.end())
500 var.type_declaration = j->second;
503 if(!block_interface.empty() && var.interface.empty())
504 var.interface = block_interface;
506 TraversingVisitor::visit(var);
507 blocks.back()->variables[var.name] = &var;
508 if(anonymous && blocks.size()>1)
509 blocks[blocks.size()-2]->variables[var.name] = &var;
512 void ProgramCompiler::VariableResolver::visit(InterfaceBlock &iface)
514 SetFlag set(anonymous);
515 SetForScope<string> set2(block_interface, iface.interface);
516 TraversingVisitor::visit(iface);
520 ProgramCompiler::InterfaceGenerator::InterfaceGenerator():
525 string ProgramCompiler::InterfaceGenerator::get_out_prefix(StageType type)
529 else if(type==GEOMETRY)
535 void ProgramCompiler::InterfaceGenerator::apply(Stage &s)
537 SetForScope<Stage *> set(stage, &s);
539 in_prefix = get_out_prefix(stage->previous->type);
540 out_prefix = get_out_prefix(stage->type);
541 stage->content.visit(*this);
544 void ProgramCompiler::InterfaceGenerator::visit(Block &block)
546 SetForScope<unsigned> set(scope_level, scope_level+1);
547 for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
553 for(map<string, VariableDeclaration *>::iterator j=iface_declarations.begin(); j!=iface_declarations.end(); ++j)
555 list<NodePtr<Node> >::iterator k = block.body.insert(i, j->second);
558 iface_declarations.clear();
561 for(list<Node *>::iterator j=insert_nodes.begin(); j!=insert_nodes.end(); ++j)
562 block.body.insert(i, *j);
563 insert_nodes.clear();
566 block.body.erase(i++);
573 string ProgramCompiler::InterfaceGenerator::change_prefix(const string &name, const string &prefix) const
575 unsigned offset = (name.compare(0, in_prefix.size(), in_prefix) ? 0 : in_prefix.size());
576 return prefix+name.substr(offset);
579 bool ProgramCompiler::InterfaceGenerator::generate_interface(VariableDeclaration &var, const string &iface, const string &name)
581 const map<string, VariableDeclaration *> &stage_vars = (iface=="in" ? stage->in_variables : stage->out_variables);
582 if(stage_vars.count(name) || iface_declarations.count(name))
585 VariableDeclaration* iface_var = new VariableDeclaration;
586 iface_var->sampling = var.sampling;
587 iface_var->interface = iface;
588 iface_var->type = var.type;
589 iface_var->type_declaration = var.type_declaration;
590 iface_var->name = name;
591 if(stage->type==GEOMETRY)
592 iface_var->array = ((var.array && var.interface!="in") || iface=="in");
594 iface_var->array = var.array;
596 iface_var->array_size = var.array_size;
598 iface_var->linked_declaration = &var;
599 iface_declarations[name] = iface_var;
604 void ProgramCompiler::InterfaceGenerator::insert_assignment(const string &left, ProgramSyntax::Expression *right)
606 Assignment *assign = new Assignment;
607 VariableReference *ref = new VariableReference;
611 assign->right = right;
613 ExpressionStatement *stmt = new ExpressionStatement;
614 stmt->expression = assign;
615 insert_nodes.push_back(stmt);
618 void ProgramCompiler::InterfaceGenerator::visit(VariableReference &var)
620 if(var.declaration || !stage->previous)
622 if(iface_declarations.count(var.name))
625 const map<string, VariableDeclaration *> &prev_out = stage->previous->out_variables;
626 map<string, VariableDeclaration *>::const_iterator i = prev_out.find(var.name);
627 if(i==prev_out.end())
628 i = prev_out.find(in_prefix+var.name);
629 if(i!=prev_out.end())
630 generate_interface(*i->second, "in", var.name);
633 void ProgramCompiler::InterfaceGenerator::visit(VariableDeclaration &var)
635 if(var.interface=="out")
638 stage->out_variables[var.name] = &var;
639 else if(generate_interface(var, "out", change_prefix(var.name, string())))
642 if(var.init_expression)
643 insert_assignment(var.name, var.init_expression->clone());
646 else if(var.interface=="in")
648 stage->in_variables[var.name] = &var;
649 if(var.linked_declaration)
650 var.linked_declaration->linked_declaration = &var;
651 else if(stage->previous)
653 const map<string, VariableDeclaration *> &prev_out = stage->previous->out_variables;
654 map<string, VariableDeclaration *>::const_iterator i = prev_out.find(var.name);
655 if(i!=prev_out.end())
657 var.linked_declaration = i->second;
658 i->second->linked_declaration = &var;
663 TraversingVisitor::visit(var);
666 void ProgramCompiler::InterfaceGenerator::visit(Passthrough &pass)
668 vector<VariableDeclaration *> pass_vars;
670 for(map<string, VariableDeclaration *>::const_iterator i=stage->in_variables.begin(); i!=stage->in_variables.end(); ++i)
671 pass_vars.push_back(i->second);
672 for(map<string, VariableDeclaration *>::const_iterator i=iface_declarations.begin(); i!=iface_declarations.end(); ++i)
673 if(i->second->interface=="in")
674 pass_vars.push_back(i->second);
678 const map<string, VariableDeclaration *> &prev_out = stage->previous->out_variables;
679 for(map<string, VariableDeclaration *>::const_iterator i=prev_out.begin(); i!=prev_out.end(); ++i)
682 for(vector<VariableDeclaration *>::const_iterator j=pass_vars.begin(); (!linked && j!=pass_vars.end()); ++j)
683 linked = ((*j)->linked_declaration==i->second);
685 if(!linked && generate_interface(*i->second, "in", i->second->name))
686 pass_vars.push_back(i->second);
690 if(stage->type==GEOMETRY)
692 VariableReference *ref = new VariableReference;
695 BinaryExpression *subscript = new BinaryExpression;
696 subscript->left = ref;
697 subscript->oper = "[";
698 subscript->right = pass.subscript;
699 subscript->after = "]";
701 MemberAccess *memacc = new MemberAccess;
702 memacc->left = subscript;
703 memacc->member = "gl_Position";
705 insert_assignment("gl_Position", memacc);
708 for(vector<VariableDeclaration *>::const_iterator i=pass_vars.begin(); i!=pass_vars.end(); ++i)
710 string out_name = change_prefix((*i)->name, out_prefix);
711 generate_interface(**i, "out", out_name);
713 VariableReference *ref = new VariableReference;
714 ref->name = (*i)->name;
717 BinaryExpression *subscript = new BinaryExpression;
718 subscript->left = ref;
719 subscript->oper = "[";
720 subscript->right = pass.subscript;
721 subscript->after = "]";
722 insert_assignment(out_name, subscript);
725 insert_assignment(out_name, ref);
732 void ProgramCompiler::VariableRenamer::visit(VariableReference &var)
735 var.name = var.declaration->name;
738 void ProgramCompiler::VariableRenamer::visit(VariableDeclaration &var)
740 if(var.linked_declaration)
741 var.name = var.linked_declaration->name;
742 TraversingVisitor::visit(var);
746 ProgramCompiler::UnusedVariableLocator::UnusedVariableLocator():
749 assignment_target(false)
752 void ProgramCompiler::UnusedVariableLocator::apply(Stage &s)
754 assignments.push_back(BlockAssignmentMap());
756 assignments.pop_back();
759 void ProgramCompiler::UnusedVariableLocator::visit(VariableReference &var)
761 unused_nodes.erase(var.declaration);
763 map<VariableDeclaration *, Node *>::iterator i = aggregates.find(var.declaration);
764 if(i!=aggregates.end())
765 unused_nodes.erase(i->second);
767 if(assignment_target)
770 for(vector<BlockAssignmentMap>::iterator j=assignments.end(); j!=assignments.begin(); )
773 BlockAssignmentMap::iterator k = j->find(var.declaration);
776 for(vector<Node *>::iterator l=k->second.nodes.begin(); l!=k->second.nodes.end(); ++l)
777 unused_nodes.erase(*l);
784 void ProgramCompiler::UnusedVariableLocator::visit(MemberAccess &memacc)
786 TraversingVisitor::visit(memacc);
787 unused_nodes.erase(memacc.declaration);
790 void ProgramCompiler::UnusedVariableLocator::visit(BinaryExpression &binary)
794 binary.left->visit(*this);
795 SetForScope<bool> set(assignment_target, false);
796 binary.right->visit(*this);
799 TraversingVisitor::visit(binary);
802 void ProgramCompiler::UnusedVariableLocator::visit(Assignment &assign)
805 SetForScope<bool> set(assignment_target, !assign.self_referencing);
806 assign.left->visit(*this);
808 assign.right->visit(*this);
809 assignment = &assign;
812 void ProgramCompiler::UnusedVariableLocator::record_assignment(VariableDeclaration &var, Node &node, bool self_ref)
814 unused_nodes.insert(&node);
815 BlockAssignmentMap &block_assignments = assignments.back();
816 AssignmentList &var_assignments = block_assignments[&var];
818 var_assignments.nodes.clear();
819 var_assignments.nodes.push_back(&node);
820 var_assignments.conditional = false;
821 var_assignments.self_referencing = self_ref;
824 void ProgramCompiler::UnusedVariableLocator::visit(ExpressionStatement &expr)
827 TraversingVisitor::visit(expr);
828 if(assignment && assignment->target_declaration)
829 record_assignment(*assignment->target_declaration, expr, assignment->self_referencing);
832 void ProgramCompiler::UnusedVariableLocator::visit(StructDeclaration &strct)
834 SetForScope<Node *> set(aggregate, &strct);
835 unused_nodes.insert(&strct);
836 TraversingVisitor::visit(strct);
839 void ProgramCompiler::UnusedVariableLocator::visit(VariableDeclaration &var)
842 aggregates[&var] = aggregate;
845 unused_nodes.insert(&var);
846 if(var.init_expression)
847 record_assignment(var, *var.init_expression, false);
849 unused_nodes.erase(var.type_declaration);
850 TraversingVisitor::visit(var);
853 void ProgramCompiler::UnusedVariableLocator::visit(InterfaceBlock &iface)
855 SetForScope<Node *> set(aggregate, &iface);
856 unused_nodes.insert(&iface);
857 TraversingVisitor::visit(iface);
860 void ProgramCompiler::UnusedVariableLocator::visit(FunctionDeclaration &func)
862 assignments.push_back(BlockAssignmentMap());
864 for(vector<NodePtr<VariableDeclaration> >::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
866 func.body.visit(*this);
868 BlockAssignmentMap &block_assignments = assignments.back();
869 for(map<string, VariableDeclaration *>::iterator i=func.body.variables.begin(); i!=func.body.variables.end(); ++i)
870 block_assignments.erase(i->second);
871 for(BlockAssignmentMap::iterator i=block_assignments.begin(); i!=block_assignments.end(); ++i)
873 if(i->first->interface=="out" && stage->type!=FRAGMENT && !i->first->linked_declaration)
876 for(vector<Node *>::iterator j=i->second.nodes.begin(); j!=i->second.nodes.end(); ++j)
877 unused_nodes.erase(*j);
880 assignments.pop_back();
883 void ProgramCompiler::UnusedVariableLocator::merge_down_assignments()
885 BlockAssignmentMap &parent_assignments = assignments[assignments.size()-2];
886 BlockAssignmentMap &block_assignments = assignments.back();
887 for(BlockAssignmentMap::iterator i=block_assignments.begin(); i!=block_assignments.end(); ++i)
889 BlockAssignmentMap::iterator j = parent_assignments.find(i->first);
890 if(j==parent_assignments.end())
891 parent_assignments.insert(*i);
892 else if(i->second.self_referencing || i->second.conditional)
894 j->second.nodes.insert(j->second.nodes.end(), i->second.nodes.begin(), i->second.nodes.end());
895 j->second.conditional |= i->second.conditional;
896 j->second.self_referencing |= i->second.self_referencing;
899 j->second = i->second;
901 assignments.pop_back();
904 void ProgramCompiler::UnusedVariableLocator::visit(Conditional &cond)
906 cond.condition->visit(*this);
907 assignments.push_back(BlockAssignmentMap());
908 cond.body.visit(*this);
910 BlockAssignmentMap if_assignments;
911 swap(assignments.back(), if_assignments);
912 cond.else_body.visit(*this);
914 BlockAssignmentMap &else_assignments = assignments.back();
915 for(BlockAssignmentMap::iterator i=else_assignments.begin(); i!=else_assignments.end(); ++i)
917 BlockAssignmentMap::iterator j = if_assignments.find(i->first);
918 if(j!=if_assignments.end())
920 i->second.nodes.insert(i->second.nodes.end(), j->second.nodes.begin(), j->second.nodes.end());
921 i->second.conditional |= j->second.conditional;
922 i->second.self_referencing |= j->second.self_referencing;
923 if_assignments.erase(j);
926 i->second.conditional = true;
929 for(BlockAssignmentMap::iterator i=if_assignments.begin(); i!=if_assignments.end(); ++i)
931 i->second.conditional = true;
932 else_assignments.insert(*i);
935 merge_down_assignments();
938 void ProgramCompiler::UnusedVariableLocator::visit(Iteration &iter)
940 assignments.push_back(BlockAssignmentMap());
941 TraversingVisitor::visit(iter);
942 merge_down_assignments();
946 void ProgramCompiler::NodeRemover::visit(Block &block)
948 for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
951 if(to_remove.count(&**i))
952 block.body.erase(i++);
958 void ProgramCompiler::NodeRemover::visit(VariableDeclaration &var)
960 if(to_remove.count(&var))
962 stage->in_variables.erase(var.name);
963 stage->out_variables.erase(var.name);
964 if(var.linked_declaration)
965 var.linked_declaration->linked_declaration = 0;
967 else if(var.init_expression && to_remove.count(&*var.init_expression))
968 var.init_expression = 0;