| /* |
| * Copyright (c) 2015 PLUMgrid, Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <algorithm> |
| #include "bcc_exception.h" |
| #include "parser.h" |
| #include "type_helper.h" |
| |
| namespace ebpf { |
| namespace cc { |
| |
| using std::find; |
| using std::move; |
| using std::string; |
| using std::unique_ptr; |
| |
| bool Parser::variable_exists(VariableDeclStmtNode *decl) const { |
| if (scopes_->current_var()->lookup(decl->id_->name_, SCOPE_LOCAL) == NULL) { |
| return false; |
| } |
| return true; |
| } |
| |
| VariableDeclStmtNode *Parser::variable_add(vector<int> *types, VariableDeclStmtNode *decl) { |
| |
| if (variable_exists(decl)) { |
| fprintf(stderr, "redeclaration of variable %s", decl->id_->name_.c_str()); |
| return nullptr; |
| } |
| decl->scope_id_ = string("v") + std::to_string(scopes_->current_var()->id_) + string("_"); |
| scopes_->current_var()->add(decl->id_->name_, decl); |
| return decl; |
| } |
| |
| VariableDeclStmtNode *Parser::variable_add(vector<int> *types, VariableDeclStmtNode *decl, ExprNode *init_expr) { |
| AssignExprNode::Ptr assign(new AssignExprNode(decl->id_->copy(), ExprNode::Ptr(init_expr))); |
| decl->init_.push_back(move(assign)); |
| |
| if (variable_exists(decl)) { |
| fprintf(stderr, "redeclaration of variable %s", decl->id_->name_.c_str()); |
| return nullptr; |
| } |
| decl->scope_id_ = string("v") + std::to_string(scopes_->current_var()->id_) + string("_"); |
| scopes_->current_var()->add(decl->id_->name_, decl); |
| return decl; |
| } |
| |
| StructVariableDeclStmtNode *Parser::variable_add(StructVariableDeclStmtNode *decl, ExprNodeList *args, bool is_kv) { |
| if (is_kv) { |
| // annotate the init expressions with the declared id |
| for (auto arg = args->begin(); arg != args->end(); ++arg) { |
| // decorate with the name of this decl |
| auto n = static_cast<AssignExprNode *>(arg->get()); |
| auto id = static_cast<IdentExprNode *>(n->lhs_.get()); |
| id->prepend_dot(decl->id_->name_); |
| } |
| } else { |
| fprintf(stderr, "must use key = value syntax\n"); |
| return NULL; |
| } |
| |
| decl->init_ = move(*args); |
| delete args; |
| |
| if (variable_exists(decl)) { |
| fprintf(stderr, "ccpg: warning: redeclaration of variable '%s'\n", decl->id_->name_.c_str()); |
| return nullptr; |
| } |
| decl->scope_id_ = string("v") + std::to_string(scopes_->current_var()->id_) + string("_"); |
| scopes_->current_var()->add(decl->id_->name_, decl); |
| return decl; |
| } |
| |
| StmtNode *Parser::state_add(Scopes::StateScope *scope, IdentExprNode *id, BlockStmtNode *body) { |
| if (scopes_->current_state()->lookup(id->full_name(), SCOPE_LOCAL)) { |
| fprintf(stderr, "redeclaration of state %s\n", id->full_name().c_str()); |
| // redeclaration |
| return NULL; |
| } |
| auto state = new StateDeclStmtNode(IdentExprNode::Ptr(id), BlockStmtNode::Ptr(body)); |
| // add a reference to the lower scope |
| state->subs_[0].scope_ = scope; |
| |
| // add me to the upper scope |
| scopes_->current_state()->add(state->id_->full_name(), state); |
| state->scope_id_ = string("s") + std::to_string(scopes_->current_state()->id_) + string("_"); |
| |
| return state; |
| } |
| |
| StmtNode *Parser::state_add(Scopes::StateScope *scope, IdentExprNode *id1, IdentExprNode *id2, BlockStmtNode *body) { |
| auto state = scopes_->current_state()->lookup(id1->full_name(), SCOPE_LOCAL); |
| if (!state) { |
| state = new StateDeclStmtNode(IdentExprNode::Ptr(id1), IdentExprNode::Ptr(id2), BlockStmtNode::Ptr(body)); |
| // add a reference to the lower scope |
| state->subs_[0].scope_ = scope; |
| |
| // add me to the upper scope |
| scopes_->current_state()->add(state->id_->full_name(), state); |
| state->scope_id_ = string("s") + std::to_string(scopes_->current_state()->id_) + string("_"); |
| return state; |
| } else { |
| if (state->find_sub(id2->name_) != state->subs_.end()) { |
| fprintf(stderr, "redeclaration of state %s, %s\n", id1->full_name().c_str(), id2->full_name().c_str()); |
| return NULL; |
| } |
| state->subs_.push_back(StateDeclStmtNode::Sub(IdentExprNode::Ptr(id2), BlockStmtNode::Ptr(body), |
| ParserStateStmtNode::Ptr(), scope)); |
| delete id1; |
| |
| return new StateDeclStmtNode(); // stub |
| } |
| } |
| |
| bool Parser::table_exists(TableDeclStmtNode *decl, bool search_local) { |
| if (scopes_->top_table()->lookup(decl->id_->name_, search_local) == NULL) { |
| return false; |
| } |
| return true; |
| } |
| |
| StmtNode *Parser::table_add(IdentExprNode *type, IdentExprNodeList *templates, |
| IdentExprNode *id, string *size) { |
| auto table = new TableDeclStmtNode(IdentExprNode::Ptr(type), |
| move(*templates), |
| IdentExprNode::Ptr(id), size); |
| if (table_exists(table, true)) { |
| fprintf(stderr, "redeclaration of table %s\n", id->name_.c_str()); |
| return table; |
| } |
| scopes_->top_table()->add(id->name_, table); |
| return table; |
| } |
| |
| StmtNode * Parser::struct_add(IdentExprNode *type, FormalList *formals) { |
| auto struct_decl = new StructDeclStmtNode(IdentExprNode::Ptr(type), move(*formals)); |
| if (scopes_->top_struct()->lookup(type->name_, SCOPE_LOCAL) != NULL) { |
| fprintf(stderr, "redeclaration of struct %s\n", type->name_.c_str()); |
| return struct_decl; |
| } |
| |
| auto pr_it = pragmas_.find("packed"); |
| if (pr_it != pragmas_.end() && pr_it->second == "true") |
| struct_decl->packed_ = true; |
| |
| int i = 0; |
| size_t offset = 0; |
| for (auto it = struct_decl->stmts_.begin(); it != struct_decl->stmts_.end(); ++it, ++i) { |
| FieldType ft = bits_to_enum((*it)->bit_width_); |
| offset = struct_decl->is_packed() ? offset : align_offset(offset, ft); |
| (*it)->slot_ = i; |
| (*it)->bit_offset_ = offset; |
| offset += (*it)->bit_width_; |
| } |
| struct_decl->bit_width_ = struct_decl->is_packed() ? offset : align_offset(offset, UINT32_T); |
| |
| scopes_->top_struct()->add(type->name_, struct_decl); |
| return struct_decl; |
| } |
| |
| StmtNode * Parser::result_add(int token, IdentExprNode *id, FormalList *formals, BlockStmtNode *body) { |
| StmtNode *stmt = NULL; |
| switch (token) { |
| case Tok::TMATCH: |
| stmt = new MatchDeclStmtNode(IdentExprNode::Ptr(id), move(*formals), BlockStmtNode::Ptr(body)); |
| break; |
| case Tok::TMISS: |
| stmt = new MissDeclStmtNode(IdentExprNode::Ptr(id), move(*formals), BlockStmtNode::Ptr(body)); |
| break; |
| case Tok::TFAILURE: |
| stmt = new FailureDeclStmtNode(IdentExprNode::Ptr(id), move(*formals), BlockStmtNode::Ptr(body)); |
| break; |
| default: |
| {} |
| } |
| return stmt; |
| } |
| |
| StmtNode * Parser::func_add(vector<int> *types, Scopes::StateScope *scope, |
| IdentExprNode *id, FormalList *formals, BlockStmtNode *body) { |
| auto decl = new FuncDeclStmtNode(IdentExprNode::Ptr(id), move(*formals), BlockStmtNode::Ptr(body)); |
| if (scopes_->top_func()->lookup(decl->id_->name_, SCOPE_LOCAL)) { |
| fprintf(stderr, "redeclaration of func %s\n", id->name_.c_str()); |
| return decl; |
| } |
| auto cur_scope = scopes_->current_var(); |
| scopes_->set_current(scope); |
| for (auto it = formals->begin(); it != formals->end(); ++it) |
| if (!variable_add(nullptr, it->get())) |
| return nullptr; |
| scopes_->set_current(cur_scope); |
| decl->scope_ = scope; |
| scopes_->top_func()->add(id->name_, decl); |
| return decl; |
| } |
| |
| void Parser::set_loc(Node *n, const BisonParser::location_type &loc) const { |
| n->line_ = loc.begin.line; |
| n->column_ = loc.begin.column; |
| n->text_ = lexer.text(loc); |
| } |
| |
| string Parser::pragma(const string &name) const { |
| auto it = pragmas_.find(name); |
| if (it == pragmas_.end()) return "main"; |
| return it->second; |
| } |
| |
| } // namespace cc |
| } // namespace ebpf |