/* * yosys -- Yosys Open SYnthesis Suite * * Copyright (C) 2012 Clifford Wolf * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * --- * * This is the AST frontend library. * * The AST frontend library is not a frontend on it's own but provides a * generic abstract syntax tree (AST) abstraction for HDL code and can be * used by HDL frontends. See "ast.h" for an overview of the API and the * Verilog frontend for an usage example. * */ #include "kernel/log.h" #include "libs/sha1/sha1.h" #include "ast.h" #include #include #include using namespace AST; using namespace AST_INTERNAL; // convert the AST into a simpler AST that has all parameters subsitited by their // values, unrolled for-loops, expanded generate blocks, etc. when this function // is done with an AST it can be converted into RTLIL using genRTLIL(). // // this function also does all name resolving and sets the id2ast member of all // nodes that link to a different node using names and lexical scoping. bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage) { AstNode *newNode = NULL; bool did_something = false; if (stage == 0) { assert(type == AST_MODULE); while (simplify(const_fold, at_zero, in_lvalue, 1)) { } if (!flag_nomem2reg && attributes.count("\\nomem2reg") == 0) { std::set mem2reg_set, mem2reg_candidates; mem2reg_as_needed_pass1(mem2reg_set, mem2reg_candidates, false, false, flag_mem2reg); for (auto node : mem2reg_set) { int mem_width, mem_size, addr_bits; node->meminfo(mem_width, mem_size, addr_bits); for (int i = 0; i < mem_size; i++) { AstNode *reg = new AstNode(AST_WIRE, new AstNode(AST_RANGE, mkconst_int(mem_width-1, true), mkconst_int(0, true))); reg->str = stringf("%s[%d]", node->str.c_str(), i); reg->is_reg = true; reg->is_signed = node->is_signed; children.push_back(reg); } } mem2reg_as_needed_pass2(mem2reg_set, this, NULL); for (size_t i = 0; i < children.size(); i++) { if (mem2reg_set.count(children[i]) > 0) { delete children[i]; children.erase(children.begin() + (i--)); } } } while (simplify(const_fold, at_zero, in_lvalue, 2)) { } return false; } current_filename = filename; set_line_num(linenum); // we do not look inside a task or function // (but as soon as a task of function is instanciated we process the generated AST as usual) if (type == AST_FUNCTION || type == AST_TASK) return false; // deactivate all calls non-synthesis system taks if ((type == AST_FCALL || type == AST_TCALL) && (str == "$display" || str == "$stop" || str == "$finish")) { delete_children(); str = std::string(); } // activate const folding if this is anything that must be evaluated statically (ranges, parameters, attributes, etc.) if (type == AST_WIRE || type == AST_PARAMETER || type == AST_LOCALPARAM || type == AST_PARASET || type == AST_RANGE || type == AST_PREFIX) const_fold = true; if (type == AST_IDENTIFIER && current_scope.count(str) > 0 && (current_scope[str]->type == AST_PARAMETER || current_scope[str]->type == AST_LOCALPARAM)) const_fold = true; std::map backup_scope; // create name resolution entries for all objects with names // also merge multiple declarations for the same wire (e.g. "output foobar; reg foobar;") if (type == AST_MODULE) { current_scope.clear(); std::map this_wire_scope; for (size_t i = 0; i < children.size(); i++) { AstNode *node = children[i]; if (node->type == AST_WIRE) { if (this_wire_scope.count(node->str) > 0) { AstNode *first_node = this_wire_scope[node->str]; if (!node->is_input && !node->is_output && node->is_reg && node->children.size() == 0) goto wires_are_compatible; if (first_node->children.size() != node->children.size()) goto wires_are_incompatible; for (size_t j = 0; j < node->children.size(); j++) { AstNode *n1 = first_node->children[j], *n2 = node->children[j]; if (n1->type == AST_RANGE && n2->type == AST_RANGE && n1->range_valid && n2->range_valid) { if (n1->range_left != n2->range_left) goto wires_are_incompatible; if (n1->range_right != n2->range_right) goto wires_are_incompatible; } else if (*n1 != *n2) goto wires_are_incompatible; } if (first_node->range_left != node->range_left) goto wires_are_incompatible; if (first_node->range_right != node->range_right) goto wires_are_incompatible; if (first_node->port_id == 0 && (node->is_input || node->is_output)) goto wires_are_incompatible; wires_are_compatible: if (node->is_input) first_node->is_input = true; if (node->is_output) first_node->is_output = true; if (node->is_reg) first_node->is_reg = true; if (node->is_signed) first_node->is_signed = true; for (auto &it : node->attributes) { if (first_node->attributes.count(it.first) > 0) delete first_node->attributes[it.first]; first_node->attributes[it.first] = it.second->clone(); } children.erase(children.begin()+(i--)); did_something = true; delete node; continue; } this_wire_scope[node->str] = node; } wires_are_incompatible: if (node->type == AST_PARAMETER || node->type == AST_LOCALPARAM || node->type == AST_WIRE || node->type == AST_AUTOWIRE || node->type == AST_GENVAR || node->type == AST_MEMORY || node->type == AST_FUNCTION || node->type == AST_TASK) { backup_scope[node->str] = current_scope[node->str]; current_scope[node->str] = node; } } } auto backup_current_block = current_block; auto backup_current_block_child = current_block_child; auto backup_current_top_block = current_top_block; // simplify all children first // (iterate by index as e.g. auto wires can add new children in the process) for (size_t i = 0; i < children.size(); i++) { bool did_something_here = true; if ((type == AST_GENFOR || type == AST_FOR) && i >= 3) break; if (type == AST_GENIF && i >= 1) break; if (type == AST_GENBLOCK) break; if (type == AST_PREFIX && i >= 1) break; while (did_something_here && i < children.size()) { bool const_fold_here = const_fold, in_lvalue_here = in_lvalue; if (i == 0 && type == AST_REPLICATE) const_fold_here = true; if (i == 0 && (type == AST_ASSIGN || type == AST_ASSIGN_EQ || type == AST_ASSIGN_LE)) in_lvalue_here = true; if (type == AST_BLOCK) { current_block = this; current_block_child = children[i]; } if ((type == AST_ALWAYS || type == AST_INITIAL) && children[i]->type == AST_BLOCK) current_top_block = children[i]; did_something_here = children[i]->simplify(const_fold_here, at_zero, in_lvalue_here, stage); if (did_something_here) did_something = true; } } for (auto &attr : attributes) { while (attr.second->simplify(true, false, false, stage)) { } } current_block = backup_current_block; current_block_child = backup_current_block_child; current_top_block = backup_current_top_block; for (auto it = backup_scope.begin(); it != backup_scope.end(); it++) { if (it->second == NULL) current_scope.erase(it->first); else current_scope[it->first] = it->second; } current_filename = filename; set_line_num(linenum); if (type == AST_MODULE) current_scope.clear(); // resolve constant prefixes if (type == AST_PREFIX) { if (children[0]->type != AST_CONSTANT) { dumpAst(NULL, "> ", NULL); log_error("Index in generate block prefix syntax at %s:%d is not constant!\n", filename.c_str(), linenum); } assert(children[1]->type == AST_IDENTIFIER); newNode = children[1]->clone(); newNode->str = stringf("%s[%d].%s", str.c_str(), children[0]->integer, children[1]->str.c_str()); goto apply_newNode; } // annotate constant ranges if (type == AST_RANGE) { bool old_range_valid = range_valid; range_valid = false; range_left = -1; range_right = 0; assert(children.size() >= 1); if (children[0]->type == AST_CONSTANT) { range_valid = true; range_left = children[0]->integer; if (children.size() == 1) range_right = range_left; } if (children.size() >= 2) { if (children[1]->type == AST_CONSTANT) range_right = children[1]->integer; else range_valid = false; } if (old_range_valid != range_valid) did_something = true; if (range_valid && range_left >= 0 && range_right > range_left) { int tmp = range_right; range_right = range_left; range_left = tmp; } } // annotate wires with their ranges if (type == AST_WIRE) { if (children.size() > 0) { if (children[0]->range_valid) { if (!range_valid) did_something = true; range_valid = true; range_left = children[0]->range_left; range_right = children[0]->range_right; } } else { if (!range_valid) did_something = true; range_valid = true; range_left = 0; range_right = 0; } } // annotate identifiers using scope resolution and create auto-wires as needed if (type == AST_IDENTIFIER) { if (current_scope.count(str) == 0) { for (auto node : current_ast_mod->children) { if ((node->type == AST_PARAMETER || node->type == AST_LOCALPARAM || node->type == AST_WIRE || node->type == AST_AUTOWIRE || node->type == AST_GENVAR || node->type == AST_MEMORY || node->type == AST_FUNCTION || node->type == AST_TASK) && str == node->str) { current_scope[node->str] = node; break; } } } if (current_scope.count(str) == 0) { log("Warning: Creating auto-wire `%s' in module `%s'.\n", str.c_str(), current_ast_mod->str.c_str()); AstNode *auto_wire = new AstNode(AST_AUTOWIRE); auto_wire->str = str; current_ast_mod->children.push_back(auto_wire); current_scope[str] = auto_wire; did_something = true; } id2ast = current_scope[str]; } // unroll for loops and generate-for blocks if ((type == AST_GENFOR || type == AST_FOR) && children.size() != 0) { AstNode *init_ast = children[0]; AstNode *while_ast = children[1]; AstNode *next_ast = children[2]; AstNode *body_ast = children[3]; if (init_ast->type != AST_ASSIGN_EQ) log_error("Unsupported 1st expression of generate for-loop at %s:%d!\n", filename.c_str(), linenum); if (next_ast->type != AST_ASSIGN_EQ) log_error("Unsupported 3rd expression of generate for-loop at %s:%d!\n", filename.c_str(), linenum); if (type == AST_GENFOR) { if (init_ast->children[0]->id2ast == NULL || init_ast->children[0]->id2ast->type != AST_GENVAR) log_error("Left hand side of 1st expression of generate for-loop at %s:%d is not a gen var!\n", filename.c_str(), linenum); if (next_ast->children[0]->id2ast == NULL || next_ast->children[0]->id2ast->type != AST_GENVAR) log_error("Left hand side of 3rd expression of generate for-loop at %s:%d is not a gen var!\n", filename.c_str(), linenum); } else { if (init_ast->children[0]->id2ast == NULL || init_ast->children[0]->id2ast->type != AST_WIRE) log_error("Left hand side of 1st expression of generate for-loop at %s:%d is not a register!\n", filename.c_str(), linenum); if (next_ast->children[0]->id2ast == NULL || next_ast->children[0]->id2ast->type != AST_WIRE) log_error("Left hand side of 3rd expression of generate for-loop at %s:%d is not a register!\n", filename.c_str(), linenum); } if (init_ast->children[0]->id2ast != next_ast->children[0]->id2ast) log_error("Incompatible left-hand sides in 1st and 3rd expression of generate for-loop at %s:%d!\n", filename.c_str(), linenum); // eval 1st expression AstNode *varbuf = init_ast->children[1]->clone(); while (varbuf->simplify(true, false, false, stage)) { } if (varbuf->type != AST_CONSTANT) log_error("Right hand side of 1st expression of generate for-loop at %s:%d is not constant!\n", filename.c_str(), linenum); varbuf = new AstNode(AST_LOCALPARAM, varbuf); varbuf->str = init_ast->children[0]->str; AstNode *backup_scope_varbuf = current_scope[varbuf->str]; current_scope[varbuf->str] = varbuf; size_t current_block_idx = 0; if (type == AST_FOR) { while (current_block_idx < current_block->children.size() && current_block->children[current_block_idx] != current_block_child) current_block_idx++; } while (1) { // eval 2nd expression AstNode *buf = while_ast->clone(); while (buf->simplify(true, false, false, stage)) { } if (buf->type != AST_CONSTANT) log_error("2nd expression of generate for-loop at %s:%d is not constant!\n", filename.c_str(), linenum); if (buf->integer == 0) { delete buf; break; } delete buf; // expand body int index = varbuf->children[0]->integer; if (body_ast->type == AST_GENBLOCK) buf = body_ast->clone(); else buf = new AstNode(AST_GENBLOCK, body_ast->clone()); if (buf->str.empty()) { std::stringstream sstr; sstr << "$genblock$" << filename << ":" << linenum << "$" << (RTLIL::autoidx++); buf->str = sstr.str(); } std::map name_map; std::stringstream sstr; sstr << buf->str << "[" << index << "]."; buf->expand_genblock(varbuf->str, sstr.str(), name_map); if (type == AST_GENFOR) { for (size_t i = 0; i < buf->children.size(); i++) current_ast_mod->children.push_back(buf->children[i]); } else { for (size_t i = 0; i < buf->children.size(); i++) current_block->children.insert(current_block->children.begin() + current_block_idx++, buf->children[i]); } buf->children.clear(); delete buf; // eval 3rd expression buf = next_ast->children[1]->clone(); while (buf->simplify(true, false, false, stage)) { } if (buf->type != AST_CONSTANT) log_error("Right hand side of 3rd expression of generate for-loop at %s:%d is not constant!\n", filename.c_str(), linenum); delete varbuf->children[0]; varbuf->children[0] = buf; } current_scope[varbuf->str] = backup_scope_varbuf; delete varbuf; delete_children(); did_something = true; } // simplify unconditional generate block if (type == AST_GENBLOCK && children.size() != 0) { if (!str.empty()) { std::map name_map; expand_genblock(std::string(), str + ".", name_map); } for (size_t i = 0; i < children.size(); i++) current_ast_mod->children.push_back(children[i]); children.clear(); did_something = true; } // simplify generate-if blocks if (type == AST_GENIF && children.size() != 0) { AstNode *buf = children[0]->clone(); while (buf->simplify(true, false, false, stage)) { } if (buf->type != AST_CONSTANT) { for (auto f : log_files) dumpAst(f, "verilog-ast> "); log_error("Condition for generate if at %s:%d is not constant!\n", filename.c_str(), linenum); } if (buf->integer != 0) { delete buf; buf = children[1]->clone(); } else { delete buf; buf = children.size() > 2 ? children[2]->clone() : NULL; } if (buf) { if (buf->type != AST_GENBLOCK) buf = new AstNode(AST_GENBLOCK, buf); if (!buf->str.empty()) { std::map name_map; buf->expand_genblock(std::string(), buf->str + ".", name_map); } for (size_t i = 0; i < buf->children.size(); i++) current_ast_mod->children.push_back(buf->children[i]); buf->children.clear(); delete buf; } delete_children(); did_something = true; } // replace primitives with assignmens if (type == AST_PRIMITIVE) { if (children.size() < 2) log_error("Insufficient number of arguments for primitive `%s' at %s:%d!\n", str.c_str(), filename.c_str(), linenum); std::vector children_list; for (auto child : children) { assert(child->type == AST_ARGUMENT); assert(child->children.size() == 1); children_list.push_back(child->children[0]); child->children.clear(); delete child; } children.clear(); AstNodeType op_type = AST_NONE; bool invert_results = false; if (str == "and") op_type = AST_BIT_AND; if (str == "nand") op_type = AST_BIT_AND, invert_results = true; if (str == "or") op_type = AST_BIT_OR; if (str == "nor") op_type = AST_BIT_OR, invert_results = true; if (str == "xor") op_type = AST_BIT_XOR; if (str == "xnor") op_type = AST_BIT_XOR, invert_results = true; if (str == "buf") op_type = AST_POS; if (str == "not") op_type = AST_POS, invert_results = true; assert(op_type != AST_NONE); AstNode *node = children_list[1]; if (op_type != AST_POS) for (size_t i = 2; i < children_list.size(); i++) node = new AstNode(op_type, node, children_list[i]); if (invert_results) node = new AstNode(AST_BIT_NOT, node); str.clear(); type = AST_ASSIGN; children.push_back(children_list[0]); children.push_back(node); did_something = true; } // replace dynamic ranges in left-hand side expressions (e.g. "foo[bar] <= 1'b1;") with // a big case block that selects the correct single-bit assignment. if (type == AST_ASSIGN_EQ || type == AST_ASSIGN_LE) { if (children[0]->type != AST_IDENTIFIER || children[0]->children.size() == 0) goto skip_dynamic_range_lvalue_expansion; if (children[0]->children[0]->range_valid || did_something) goto skip_dynamic_range_lvalue_expansion; if (children[0]->id2ast == NULL || children[0]->id2ast->type != AST_WIRE) goto skip_dynamic_range_lvalue_expansion; if (!children[0]->id2ast->range_valid) goto skip_dynamic_range_lvalue_expansion; int source_width = children[0]->id2ast->range_left - children[0]->id2ast->range_right + 1; int result_width = 1; AstNode *shift_expr = NULL; AstNode *range = children[0]->children[0]; if (range->children.size() == 1) { shift_expr = range->children[0]->clone(); } else { shift_expr = range->children[1]->clone(); AstNode *left_at_zero_ast = range->children[0]->clone(); AstNode *right_at_zero_ast = range->children[1]->clone(); while (left_at_zero_ast->simplify(true, true, false, stage)) { } while (right_at_zero_ast->simplify(true, true, false, stage)) { } if (left_at_zero_ast->type != AST_CONSTANT || right_at_zero_ast->type != AST_CONSTANT) log_error("Unsupported expression on dynamic range select on signal `%s' at %s:%d!\n", str.c_str(), filename.c_str(), linenum); result_width = left_at_zero_ast->integer - right_at_zero_ast->integer + 1; } did_something = true; newNode = new AstNode(AST_CASE, shift_expr); for (int i = 0; i <= source_width-result_width; i++) { int start_bit = children[0]->id2ast->range_right + i; AstNode *cond = new AstNode(AST_COND, mkconst_int(start_bit, true)); AstNode *lvalue = children[0]->clone(); lvalue->delete_children(); lvalue->children.push_back(new AstNode(AST_RANGE, mkconst_int(start_bit+result_width-1, true), mkconst_int(start_bit, true))); cond->children.push_back(new AstNode(AST_BLOCK, new AstNode(type, lvalue, children[1]->clone()))); newNode->children.push_back(cond); } goto apply_newNode; } skip_dynamic_range_lvalue_expansion:; // found right-hand side identifier for memory -> replace with memory read port if (stage > 1 && type == AST_IDENTIFIER && id2ast != NULL && id2ast->type == AST_MEMORY && !in_lvalue && children[0]->type == AST_RANGE && children[0]->children.size() == 1) { newNode = new AstNode(AST_MEMRD, children[0]->children[0]->clone()); newNode->str = str; goto apply_newNode; } // assignment with memory in left-hand side expression -> replace with memory write port if (stage > 1 && (type == AST_ASSIGN_EQ || type == AST_ASSIGN_LE) && children[0]->type == AST_IDENTIFIER && children[0]->children.size() == 1 && children[0]->id2ast && children[0]->id2ast->type == AST_MEMORY && children[0]->id2ast->children.size() >= 2 && children[0]->id2ast->children[0]->range_valid && children[0]->id2ast->children[1]->range_valid) { std::stringstream sstr; sstr << "$memwr$" << children[0]->str << "$" << filename << ":" << linenum << "$" << (RTLIL::autoidx++); std::string id_addr = sstr.str() + "_ADDR", id_data = sstr.str() + "_DATA", id_en = sstr.str() + "_EN"; if (type == AST_ASSIGN_EQ) log("Warining: Blocking assignment to memory in line %s:%d is handled like a non-blocking assignment.\n", filename.c_str(), linenum); int mem_width, mem_size, addr_bits; children[0]->id2ast->meminfo(mem_width, mem_size, addr_bits); AstNode *wire_addr = new AstNode(AST_WIRE, new AstNode(AST_RANGE, mkconst_int(addr_bits-1, true), mkconst_int(0, true))); wire_addr->str = id_addr; current_ast_mod->children.push_back(wire_addr); current_scope[wire_addr->str] = wire_addr; AstNode *wire_data = new AstNode(AST_WIRE, new AstNode(AST_RANGE, mkconst_int(mem_width-1, true), mkconst_int(0, true))); wire_data->str = id_data; current_ast_mod->children.push_back(wire_data); current_scope[wire_data->str] = wire_data; AstNode *wire_en = new AstNode(AST_WIRE); wire_en->str = id_en; current_ast_mod->children.push_back(wire_en); current_scope[wire_en->str] = wire_en; std::vector x_bits; x_bits.push_back(RTLIL::State::Sx); AstNode *assign_addr = new AstNode(AST_ASSIGN_LE, new AstNode(AST_IDENTIFIER), mkconst_bits(x_bits, false)); assign_addr->children[0]->str = id_addr; AstNode *assign_data = new AstNode(AST_ASSIGN_LE, new AstNode(AST_IDENTIFIER), mkconst_bits(x_bits, false)); assign_data->children[0]->str = id_data; AstNode *assign_en = new AstNode(AST_ASSIGN_LE, new AstNode(AST_IDENTIFIER), mkconst_int(0, false, 1)); assign_en->children[0]->str = id_en; AstNode *default_signals = new AstNode(AST_BLOCK); default_signals->children.push_back(assign_addr); default_signals->children.push_back(assign_data); default_signals->children.push_back(assign_en); current_top_block->children.insert(current_top_block->children.begin(), default_signals); assign_addr = new AstNode(AST_ASSIGN_LE, new AstNode(AST_IDENTIFIER), children[0]->children[0]->children[0]->clone()); assign_addr->children[0]->str = id_addr; assign_data = new AstNode(AST_ASSIGN_LE, new AstNode(AST_IDENTIFIER), children[1]->clone()); assign_data->children[0]->str = id_data; assign_en = new AstNode(AST_ASSIGN_LE, new AstNode(AST_IDENTIFIER), mkconst_int(1, false, 1)); assign_en->children[0]->str = id_en; newNode = new AstNode(AST_BLOCK); newNode->children.push_back(assign_addr); newNode->children.push_back(assign_data); newNode->children.push_back(assign_en); AstNode *wrnode = new AstNode(AST_MEMWR); wrnode->children.push_back(new AstNode(AST_IDENTIFIER)); wrnode->children.push_back(new AstNode(AST_IDENTIFIER)); wrnode->children.push_back(new AstNode(AST_IDENTIFIER)); wrnode->str = children[0]->str; wrnode->children[0]->str = id_addr; wrnode->children[1]->str = id_data; wrnode->children[2]->str = id_en; current_ast_mod->children.push_back(wrnode); goto apply_newNode; } // replace function and task calls with the code from the function or task if ((type == AST_FCALL || type == AST_TCALL) && !str.empty()) { if (type == AST_FCALL) { if (current_scope.count(str) == 0 || current_scope[str]->type != AST_FUNCTION) log_error("Can't resolve function name `%s' at %s:%d.\n", str.c_str(), filename.c_str(), linenum); } if (type == AST_TCALL) { if (current_scope.count(str) == 0 || current_scope[str]->type != AST_TASK) log_error("Can't resolve task name `%s' at %s:%d.\n", str.c_str(), filename.c_str(), linenum); } AstNode *decl = current_scope[str]; std::stringstream sstr; sstr << "$func$" << str << "$" << filename << ":" << linenum << "$" << (RTLIL::autoidx++) << "$"; std::string prefix = sstr.str(); size_t arg_count = 0; std::map replace_rules; if (current_block == NULL) { assert(type == AST_FCALL); AstNode *wire = NULL; for (auto child : decl->children) if (child->type == AST_WIRE && child->str == str) wire = child->clone(); assert(wire != NULL); wire->str = prefix + str; wire->port_id = 0; wire->is_input = false; wire->is_output = false; current_ast_mod->children.push_back(wire); AstNode *lvalue = new AstNode(AST_IDENTIFIER); lvalue->str = wire->str; AstNode *always = new AstNode(AST_ALWAYS, new AstNode(AST_BLOCK, new AstNode(AST_ASSIGN_EQ, lvalue, clone()))); current_ast_mod->children.push_back(always); goto replace_fcall_with_id; } for (auto child : decl->children) { if (child->type == AST_WIRE) { AstNode *wire = child->clone(); wire->str = prefix + wire->str; wire->port_id = 0; wire->is_input = false; wire->is_output = false; current_ast_mod->children.push_back(wire); replace_rules[child->str] = wire->str; if (child->is_input && arg_count < children.size()) { AstNode *arg = children[arg_count++]->clone(); AstNode *wire_id = new AstNode(AST_IDENTIFIER); wire_id->str = wire->str; AstNode *assign = new AstNode(AST_ASSIGN_EQ, wire_id, arg); for (auto it = current_block->children.begin(); it != current_block->children.end(); it++) { if (*it != current_block_child) continue; current_block->children.insert(it, assign); break; } } } else { AstNode *stmt = child->clone(); stmt->replace_ids(replace_rules); for (auto it = current_block->children.begin(); it != current_block->children.end(); it++) { if (*it != current_block_child) continue; current_block->children.insert(it, stmt); break; } } } replace_fcall_with_id: if (type == AST_FCALL) { delete_children(); type = AST_IDENTIFIER; str = prefix + str; } if (type == AST_TCALL) str = ""; did_something = true; } // perform const folding when activated if (const_fold && newNode == NULL) { std::vector tmp_bits; RTLIL::Const (*const_func)(const RTLIL::Const&, const RTLIL::Const&, bool, bool, int); RTLIL::Const dummy_arg; switch (type) { case AST_IDENTIFIER: if (current_scope.count(str) > 0 && (current_scope[str]->type == AST_PARAMETER || current_scope[str]->type == AST_LOCALPARAM)) { if (children.size() != 0 && children[0]->type == AST_RANGE && children[0]->range_valid) { if (current_scope[str]->children[0]->type == AST_CONSTANT) { std::vector data; for (int i = children[0]->range_right; i <= children[0]->range_left; i++) data.push_back(current_scope[str]->children[0]->bits[i]); newNode = mkconst_bits(data, false); } } else if (children.size() == 0) newNode = current_scope[str]->children[0]->clone(); } else if (at_zero && current_module->wires.count(str) > 0) { assert(current_scope.count(str) > 0 && (current_scope[str]->type == AST_WIRE || current_scope[str]->type == AST_AUTOWIRE)); if (children.size() != 0 && children[0]->type == AST_RANGE && children[0]->range_valid) newNode = mkconst_int(0, false, children[0]->range_left - children[0]->range_right + 1); else if (children.size() == 0) newNode = mkconst_int(0, current_scope[str]->is_signed, current_module->wires[str]->width); } break; case AST_BIT_NOT: if (children[0]->type == AST_CONSTANT) { RTLIL::Const y = RTLIL::const_not(RTLIL::Const(children[0]->bits), dummy_arg, children[0]->is_signed, false, -1); newNode = mkconst_bits(y.bits, false); } break; if (0) { case AST_BIT_AND: const_func = RTLIL::const_and; } if (0) { case AST_BIT_OR: const_func = RTLIL::const_or; } if (0) { case AST_BIT_XOR: const_func = RTLIL::const_xor; } if (0) { case AST_BIT_XNOR: const_func = RTLIL::const_xnor; } if (children[0]->type == AST_CONSTANT && children[1]->type == AST_CONSTANT) { RTLIL::Const y = const_func(RTLIL::Const(children[0]->bits), RTLIL::Const(children[1]->bits), children[0]->is_signed, children[1]->is_signed, -1); newNode = mkconst_bits(y.bits, false); } break; if (0) { case AST_REDUCE_AND: const_func = RTLIL::const_reduce_and; } if (0) { case AST_REDUCE_OR: const_func = RTLIL::const_reduce_or; } if (0) { case AST_REDUCE_XOR: const_func = RTLIL::const_reduce_xor; } if (0) { case AST_REDUCE_XNOR: const_func = RTLIL::const_reduce_xnor; } if (0) { case AST_REDUCE_BOOL: const_func = RTLIL::const_reduce_bool; } if (children[0]->type == AST_CONSTANT) { RTLIL::Const y = const_func(RTLIL::Const(children[0]->bits), dummy_arg, children[0]->is_signed, false, -1); newNode = mkconst_bits(y.bits, false); } break; case AST_LOGIC_NOT: if (children[0]->type == AST_CONSTANT) { RTLIL::Const y = RTLIL::const_logic_not(RTLIL::Const(children[0]->bits), dummy_arg, children[0]->is_signed, false, -1); newNode = mkconst_bits(y.bits, false); } break; if (0) { case AST_LOGIC_AND: const_func = RTLIL::const_logic_and; } if (0) { case AST_LOGIC_OR: const_func = RTLIL::const_logic_or; } if (children[0]->type == AST_CONSTANT && children[1]->type == AST_CONSTANT) { RTLIL::Const y = const_func(RTLIL::Const(children[0]->bits), RTLIL::Const(children[1]->bits), children[0]->is_signed, children[1]->is_signed, -1); newNode = mkconst_bits(y.bits, false); } break; if (0) { case AST_SHIFT_LEFT: const_func = RTLIL::const_shl; } if (0) { case AST_SHIFT_RIGHT: const_func = RTLIL::const_shr; } if (0) { case AST_SHIFT_SLEFT: const_func = RTLIL::const_sshl; } if (0) { case AST_SHIFT_SRIGHT: const_func = RTLIL::const_sshr; } if (children[0]->type == AST_CONSTANT && children[1]->type == AST_CONSTANT) { RTLIL::Const y = const_func(RTLIL::Const(children[0]->bits), RTLIL::Const(children[1]->bits), children[0]->is_signed, false, -1); newNode = mkconst_bits(y.bits, children[0]->is_signed); } break; if (0) { case AST_LT: const_func = RTLIL::const_lt; } if (0) { case AST_LE: const_func = RTLIL::const_le; } if (0) { case AST_EQ: const_func = RTLIL::const_eq; } if (0) { case AST_NE: const_func = RTLIL::const_ne; } if (0) { case AST_GE: const_func = RTLIL::const_ge; } if (0) { case AST_GT: const_func = RTLIL::const_gt; } if (children[0]->type == AST_CONSTANT && children[1]->type == AST_CONSTANT) { RTLIL::Const y = const_func(RTLIL::Const(children[0]->bits), RTLIL::Const(children[1]->bits), children[0]->is_signed, children[1]->is_signed, -1); newNode = mkconst_bits(y.bits, false); } break; if (0) { case AST_ADD: const_func = RTLIL::const_add; } if (0) { case AST_SUB: const_func = RTLIL::const_sub; } if (0) { case AST_MUL: const_func = RTLIL::const_mul; } if (0) { case AST_DIV: const_func = RTLIL::const_div; } if (0) { case AST_MOD: const_func = RTLIL::const_mod; } if (0) { case AST_POW: const_func = RTLIL::const_pow; } if (children[0]->type == AST_CONSTANT && children[1]->type == AST_CONSTANT) { RTLIL::Const y = const_func(RTLIL::Const(children[0]->bits), RTLIL::Const(children[1]->bits), children[0]->is_signed, children[1]->is_signed, -1); newNode = mkconst_bits(y.bits, children[0]->is_signed && children[1]->is_signed); } break; if (0) { case AST_POS: const_func = RTLIL::const_pos; } if (0) { case AST_NEG: const_func = RTLIL::const_neg; } if (children[0]->type == AST_CONSTANT) { RTLIL::Const y = const_func(RTLIL::Const(children[0]->bits), dummy_arg, children[0]->is_signed, false, -1); newNode = mkconst_bits(y.bits, children[0]->is_signed); } break; case AST_TERNARY: if (children[0]->type == AST_CONSTANT) { if (children[0]->integer) newNode = children[1]->clone(); else newNode = children[2]->clone(); } break; case AST_CONCAT: for (auto it = children.begin(); it != children.end(); it++) { if ((*it)->type != AST_CONSTANT) goto not_const; tmp_bits.insert(tmp_bits.end(), (*it)->bits.begin(), (*it)->bits.end()); } newNode = mkconst_bits(tmp_bits, is_signed); break; default: not_const: break; } } // if any of the above set 'newNode' -> use 'newNode' as template to update 'this' if (newNode) { apply_newNode: // fprintf(stderr, "----\n"); // dumpAst(stderr, "- "); // newNode->dumpAst(stderr, "+ "); assert(newNode != NULL); newNode->filename = filename; newNode->linenum = linenum; newNode->cloneInto(this); delete newNode; did_something = true; } return did_something; } // annotate the names of all wires and other named objects in a generate block void AstNode::expand_genblock(std::string index_var, std::string prefix, std::map &name_map) { if (!index_var.empty() && type == AST_IDENTIFIER && str == index_var) { current_scope[index_var]->children[0]->cloneInto(this); return; } if ((type == AST_IDENTIFIER || type == AST_FCALL || type == AST_TCALL) && name_map.count(str) > 0) str = name_map[str]; std::map backup_name_map; for (size_t i = 0; i < children.size(); i++) { AstNode *child = children[i]; if (child->type == AST_WIRE || child->type == AST_MEMORY || child->type == AST_PARAMETER || child->type == AST_LOCALPARAM || child->type == AST_FUNCTION || child->type == AST_TASK || child->type == AST_CELL) { if (backup_name_map.size() == 0) backup_name_map = name_map; std::string new_name = prefix[0] == '\\' ? prefix.substr(1) : prefix; size_t pos = child->str.rfind('.'); if (pos == std::string::npos) pos = child->str[0] == '\\' ? 1 : 0; else pos = pos + 1; new_name = child->str.substr(0, pos) + new_name + child->str.substr(pos); if (new_name[0] != '$' && new_name[0] != '\\') new_name = prefix[0] + new_name; name_map[child->str] = new_name; child->str = new_name; } } for (size_t i = 0; i < children.size(); i++) { AstNode *child = children[i]; if (child->type != AST_FUNCTION && child->type != AST_TASK) child->expand_genblock(index_var, prefix, name_map); } if (backup_name_map.size() > 0) name_map.swap(backup_name_map); } // rename stuff (used when tasks of functions are instanciated) void AstNode::replace_ids(std::map &rules) { if (type == AST_IDENTIFIER && rules.count(str) > 0) str = rules[str]; for (auto child : children) child->replace_ids(rules); } // find memories that should be replaced by registers void AstNode::mem2reg_as_needed_pass1(std::set &mem2reg_set, std::set &mem2reg_candidates, bool sync_proc, bool async_proc, bool force_mem2reg) { if ((type == AST_ASSIGN_LE && async_proc) || (type == AST_ASSIGN_EQ && (sync_proc || async_proc))) if (children[0]->type == AST_IDENTIFIER && children[0]->id2ast && children[0]->id2ast->type == AST_MEMORY && children[0]->id2ast->attributes.count("\\nomem2reg") == 0) { if (async_proc || mem2reg_candidates.count(children[0]->id2ast) > 0) { if (mem2reg_set.count(children[0]->id2ast) == 0) log("Warning: Replacing memory %s with list of registers because of assignment in line %s:%d.\n", children[0]->str.c_str(), filename.c_str(), linenum); mem2reg_set.insert(children[0]->id2ast); } mem2reg_candidates.insert(children[0]->id2ast); } if (type == AST_MEMORY && (attributes.count("\\mem2reg") > 0 || force_mem2reg)) mem2reg_set.insert(this); if (type == AST_MODULE && attributes.count("\\mem2reg") > 0) force_mem2reg = true; if (type == AST_ALWAYS) { for (auto child : children) { if (child->type == AST_POSEDGE || child->type == AST_NEGEDGE) sync_proc = true; } async_proc = !sync_proc; } for (auto child : children) child->mem2reg_as_needed_pass1(mem2reg_set, mem2reg_candidates, sync_proc, async_proc, force_mem2reg); } // actually replace memories with registers void AstNode::mem2reg_as_needed_pass2(std::set &mem2reg_set, AstNode *mod, AstNode *block) { if (type == AST_BLOCK) block = this; if ((type == AST_ASSIGN_LE || type == AST_ASSIGN_EQ) && block != NULL && children[0]->id2ast && mem2reg_set.count(children[0]->id2ast) > 0) { std::stringstream sstr; sstr << "$mem2reg_wr$" << children[0]->str << "$" << filename << ":" << linenum << "$" << (RTLIL::autoidx++); std::string id_addr = sstr.str() + "_ADDR", id_data = sstr.str() + "_DATA"; int mem_width, mem_size, addr_bits; children[0]->id2ast->meminfo(mem_width, mem_size, addr_bits); AstNode *wire_addr = new AstNode(AST_WIRE, new AstNode(AST_RANGE, mkconst_int(addr_bits-1, true), mkconst_int(0, true))); wire_addr->str = id_addr; wire_addr->is_reg = true; wire_addr->attributes["\\nosync"] = AstNode::mkconst_int(0, false, 0); mod->children.push_back(wire_addr); AstNode *wire_data = new AstNode(AST_WIRE, new AstNode(AST_RANGE, mkconst_int(mem_width-1, true), mkconst_int(0, true))); wire_data->str = id_data; wire_data->is_reg = true; wire_data->attributes["\\nosync"] = AstNode::mkconst_int(0, false, 0); mod->children.push_back(wire_data); assert(block != NULL); size_t assign_idx = 0; while (assign_idx < block->children.size() && block->children[assign_idx] != this) assign_idx++; assert(assign_idx < block->children.size()); AstNode *assign_addr = new AstNode(AST_ASSIGN_EQ, new AstNode(AST_IDENTIFIER), children[0]->children[0]->children[0]->clone()); assign_addr->children[0]->str = id_addr; block->children.insert(block->children.begin()+assign_idx+1, assign_addr); AstNode *case_node = new AstNode(AST_CASE, new AstNode(AST_IDENTIFIER)); case_node->children[0]->str = id_addr; for (int i = 0; i < mem_size; i++) { if (children[0]->children[0]->children[0]->type == AST_CONSTANT && int(children[0]->children[0]->children[0]->integer) != i) continue; AstNode *cond_node = new AstNode(AST_COND, AstNode::mkconst_int(i, false, addr_bits), new AstNode(AST_BLOCK)); AstNode *assign_reg = new AstNode(type, new AstNode(AST_IDENTIFIER), new AstNode(AST_IDENTIFIER)); assign_reg->children[0]->str = stringf("%s[%d]", children[0]->str.c_str(), i); assign_reg->children[1]->str = id_data; cond_node->children[1]->children.push_back(assign_reg); case_node->children.push_back(cond_node); } block->children.insert(block->children.begin()+assign_idx+2, case_node); children[0]->delete_children(); children[0]->range_valid = false; children[0]->id2ast = NULL; children[0]->str = id_data; type = AST_ASSIGN_EQ; } if (type == AST_IDENTIFIER && id2ast && mem2reg_set.count(id2ast) > 0) { std::stringstream sstr; sstr << "$mem2reg_rd$" << children[0]->str << "$" << filename << ":" << linenum << "$" << (RTLIL::autoidx++); std::string id_addr = sstr.str() + "_ADDR", id_data = sstr.str() + "_DATA"; int mem_width, mem_size, addr_bits; id2ast->meminfo(mem_width, mem_size, addr_bits); AstNode *wire_addr = new AstNode(AST_WIRE, new AstNode(AST_RANGE, mkconst_int(addr_bits-1, true), mkconst_int(0, true))); wire_addr->str = id_addr; wire_addr->attributes["\\nosync"] = AstNode::mkconst_int(0, false, 0); mod->children.push_back(wire_addr); AstNode *wire_data = new AstNode(AST_WIRE, new AstNode(AST_RANGE, mkconst_int(mem_width-1, true), mkconst_int(0, true))); wire_data->str = id_data; wire_data->attributes["\\nosync"] = AstNode::mkconst_int(0, false, 0); mod->children.push_back(wire_data); AstNode *assign_addr = new AstNode(AST_ASSIGN_EQ, new AstNode(AST_IDENTIFIER), children[0]->children[0]->clone()); assign_addr->children[0]->str = id_addr; AstNode *case_node = new AstNode(AST_CASE, new AstNode(AST_IDENTIFIER)); case_node->children[0]->str = id_addr; for (int i = 0; i < mem_size; i++) { if (children[0]->children[0]->type == AST_CONSTANT && int(children[0]->children[0]->integer) != i) continue; AstNode *cond_node = new AstNode(AST_COND, AstNode::mkconst_int(i, false, addr_bits), new AstNode(AST_BLOCK)); AstNode *assign_reg = new AstNode(AST_ASSIGN_EQ, new AstNode(AST_IDENTIFIER), new AstNode(AST_IDENTIFIER)); assign_reg->children[0]->str = id_data; assign_reg->children[1]->str = stringf("%s[%d]", str.c_str(), i); cond_node->children[1]->children.push_back(assign_reg); case_node->children.push_back(cond_node); } std::vector x_bits; x_bits.push_back(RTLIL::State::Sx); AstNode *cond_node = new AstNode(AST_COND, new AstNode(AST_DEFAULT), new AstNode(AST_BLOCK)); AstNode *assign_reg = new AstNode(AST_ASSIGN_EQ, new AstNode(AST_IDENTIFIER), AstNode::mkconst_bits(x_bits, false)); assign_reg->children[0]->str = id_data; cond_node->children[1]->children.push_back(assign_reg); case_node->children.push_back(cond_node); if (block) { size_t assign_idx = 0; while (assign_idx < block->children.size() && !block->children[assign_idx]->contains(this)) assign_idx++; assert(assign_idx < block->children.size()); block->children.insert(block->children.begin()+assign_idx, case_node); block->children.insert(block->children.begin()+assign_idx, assign_addr); wire_addr->is_reg = true; wire_data->is_reg = true; } else { AstNode *proc = new AstNode(AST_ALWAYS, new AstNode(AST_BLOCK)); proc->children[0]->children.push_back(case_node); mod->children.push_back(proc); mod->children.push_back(assign_addr); } delete_children(); range_valid = false; id2ast = NULL; str = id_data; } assert(id2ast == NULL || mem2reg_set.count(id2ast) == 0); auto children_list = children; for (size_t i = 0; i < children_list.size(); i++) children_list[i]->mem2reg_as_needed_pass2(mem2reg_set, mod, block); } // calulate memory dimensions void AstNode::meminfo(int &mem_width, int &mem_size, int &addr_bits) { assert(type == AST_MEMORY); mem_width = children[0]->range_left - children[0]->range_right + 1; mem_size = children[1]->range_left - children[1]->range_right; if (mem_size < 0) mem_size *= -1; mem_size += std::min(children[1]->range_left, children[1]->range_right) + 1; addr_bits = 1; while ((1 << addr_bits) < mem_size) addr_bits++; }