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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2021 Symbiflow Authors
*
*
* 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.
*
*/
#include "design_utils.h"
#include "log.h"
#include "nextpnr.h"
#include "util.h"
NEXTPNR_NAMESPACE_BEGIN
static const MacroPOD *lookup_macro(const ChipInfoPOD *chip, IdString cell_type)
{
for (const auto ¯o : chip->macros) {
if (IdString(macro.name) == cell_type)
return ¯o;
}
return nullptr;
}
static const MacroExpansionPOD *lookup_macro_rules(const ChipInfoPOD *chip, IdString cell_type)
{
for (const auto &rule : chip->macro_rules) {
if (IdString(rule.prim_name) == cell_type)
return &rule;
}
return nullptr;
}
static IdString derived_name(Context *ctx, IdString base_name, IdString suffix)
{
return ctx->idf("%s/%s", base_name.c_str(ctx), suffix.c_str(ctx));
}
void Arch::expand_macros()
{
log_info("Expand macros\n");
// Make up a list of cells, so we don't have modify-while-iterating issues
Context *ctx = getCtx();
std::vector<CellInfo *> cells;
for (auto &cell : ctx->cells)
cells.push_back(cell.second.get());
std::vector<CellInfo *> next_cells;
bool first_iter = false;
do {
// Expand cells
for (auto cell : cells) {
// TODO: consult exception map
const MacroExpansionPOD *exp = lookup_macro_rules(chip_info, cell->type);
// Block infinite expansion loop due to a macro being expanded in the same primitive.
// E.g.: OBUFTDS expands into the following cells, with an infinite loop being generated:
// - 2 OBUFTDS
// - 1 INV
if (exp && first_iter)
continue;
const MacroPOD *macro = lookup_macro(chip_info, exp ? IdString(exp->macro_name) : cell->type);
if (macro == nullptr)
continue;
// Get the ultimate root of this macro expansion
IdString parent = (cell->macro_parent == IdString()) ? cell->name : cell->macro_parent;
// Create child instances
for (const auto &inst : macro->cell_insts) {
CellInfo *inst_cell =
ctx->createCell(derived_name(ctx, cell->name, IdString(inst.name)), IdString(inst.type));
for (const auto ¶m : inst.parameters) {
inst_cell->params[IdString(param.key)] = IdString(param.value).str(ctx);
}
inst_cell->macro_parent = parent;
next_cells.push_back(inst_cell);
}
// Create and connect nets
for (const auto &net_data : macro->nets) {
NetInfo *net = nullptr;
// If there is a top level port, use that as the net
for (const auto &net_port : net_data.ports) {
if (net_port.instance != 0)
continue;
// TODO: case of multiple top level ports on the same net?
NPNR_ASSERT(net == nullptr);
// Use the corresponding pre-expansion port net
net = cell->getPort(IdString(net_port.port));
// Disconnect the original port pre-expansion
cell->disconnectPort(IdString(net_port.port));
}
// If not on a top level port, create a new net
if (net == nullptr)
net = ctx->createNet(derived_name(ctx, cell->name, IdString(net_data.name)));
// Create and connect instance ports
for (const auto &net_port : net_data.ports) {
if (net_port.instance == 0)
continue;
IdString port_name(net_port.port);
CellInfo *inst_cell =
ctx->cells.at(derived_name(ctx, cell->name, IdString(net_port.instance))).get();
inst_cell->ports[port_name].name = port_name;
inst_cell->ports[port_name].type = PortType(net_port.dir);
inst_cell->connectPort(port_name, net);
}
}
if (exp != nullptr) {
// Convert parameters, according to the exception rules
for (const auto ¶m_rule : exp->param_rules) {
IdString prim_param(param_rule.prim_param);
if (!cell->params.count(prim_param))
continue;
const auto &prim_param_val = cell->params.at(prim_param);
IdString inst_name = derived_name(ctx, cell->name, IdString(param_rule.inst_name));
CellInfo *inst_cell = ctx->cells.at(inst_name).get();
IdString inst_param(param_rule.inst_param);
if (param_rule.rule_type == PARAM_MAP_COPY) {
inst_cell->params[inst_param] = prim_param_val;
} else if (param_rule.rule_type == PARAM_MAP_SLICE) {
auto prim_bits = cell_parameters.parse_int_like(ctx, cell->type, prim_param, prim_param_val);
Property value(0, param_rule.slice_bits.ssize());
for (int i = 0; i < param_rule.slice_bits.ssize(); i++) {
size_t bit = param_rule.slice_bits[i];
if (bit >= prim_bits.size())
continue;
value.str.at(i) = prim_bits.get(bit) ? Property::S1 : Property::S0;
}
inst_cell->params[inst_param] = value;
} else if (param_rule.rule_type == PARAM_MAP_TABLE) {
const std::string &prim_str = prim_param_val.as_string();
IdString prim_id = ctx->id(prim_str);
for (auto &tbl_entry : param_rule.map_table) {
if (IdString(tbl_entry.key) == prim_id) {
inst_cell->params[inst_param] = IdString(tbl_entry.value).str(ctx);
break;
}
}
if (!inst_cell->params.count(inst_param))
log_error("Unsupported value '%s' for property '%s' of cell %s:%s\n", prim_str.c_str(),
ctx->nameOf(prim_param), ctx->nameOf(cell), ctx->nameOf(cell->type));
}
}
}
// Remove the now-expanded cell, but first make sure we don't leave behind any dangling references
for (const auto &port : cell->ports)
if (port.second.net != nullptr)
log_error("Macro expansion of %s:%s left dangling port %s.", ctx->nameOf(cell),
ctx->nameOf(cell->type), ctx->nameOf(port.first));
ctx->cells.erase(cell->name);
}
// Iterate until no more expansions are possible
// The next iteration only needs to look at cells created in this iteration
std::swap(next_cells, cells);
next_cells.clear();
first_iter = true;
} while (!cells.empty());
// Do this at the end, otherwise we might add cells that are later destroyed
for (auto &cell : ctx->cells)
macro_to_cells[cell.second->macro_parent].push_back(cell.second.get());
}
NEXTPNR_NAMESPACE_END
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