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glift: Add skeleton for `glift` command.
2020-04-20 16:13:59 -05:00
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2020 Alberto Gonzalez <boqwxp@airmail.cc>
*
* 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 "kernel/register.h"
#include "kernel/rtlil.h"
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#include "kernel/utils.h"
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#include "kernel/log.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
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struct GliftWorker {
private:
bool is_top_module = false;
bool opt_create_precise_model = false, opt_create_imprecise_model = false, opt_create_instrumented_model = false;
bool opt_taintconstants = false, opt_keepoutputs = false, opt_simplecostmodel = false, opt_nocostmodel = false;
bool opt_instrumentmore = false;
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std::vector<RTLIL::Wire *> new_taint_outputs;
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std::vector<std::pair<RTLIL::SigSpec, RTLIL::IdString>> meta_mux_selects;
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RTLIL::Module *module = nullptr;
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const RTLIL::IdString cost_model_wire_name = ID(__glift_weight);
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const RTLIL::IdString glift_attribute_name = ID(glift);
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RTLIL::SigSpec get_corresponding_taint_signal(RTLIL::SigSpec sig) {
RTLIL::SigSpec ret;
//Get the connected wire for the cell port:
log_assert(sig.is_wire() || sig.is_fully_const());
log_assert(sig.is_wire() || sig.is_fully_const());
//Get a SigSpec for the corresponding taint signal for the cell port, creating one if necessary:
if (sig.is_wire()) {
RTLIL::Wire *w = module->wire(sig.as_wire()->name.str() + "_t");
if (w == nullptr) w = module->addWire(sig.as_wire()->name.str() + "_t", 1);
ret = w;
}
else if (sig.is_fully_const() && opt_taintconstants)
ret = RTLIL::State::S1;
else if (sig.is_fully_const())
ret = RTLIL::State::S0;
else
log_cmd_error("Cell port SigSpec has unexpected type.\n");
//Finally, if the cell port was a module input or output, make sure the corresponding taint signal is marked, too:
if(sig.is_wire() && sig.as_wire()->port_input)
ret.as_wire()->port_input = true;
if(sig.is_wire() && sig.as_wire()->port_output)
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new_taint_outputs.push_back(ret.as_wire());
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return ret;
}
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void add_precise_GLIFT_logic(const RTLIL::Cell *cell, RTLIL::SigSpec &port_a, RTLIL::SigSpec &port_a_taint, RTLIL::SigSpec &port_b, RTLIL::SigSpec &port_b_taint, RTLIL::SigSpec &port_y_taint) {
//AKA AN2_SH2 or OR2_SH2
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bool is_and = cell->type.in(ID($_AND_), ID($_NAND_));
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RTLIL::SigSpec n_port_a = module->LogicNot(cell->name.str() + "_t_1_1", port_a, false, cell->get_src_attribute());
RTLIL::SigSpec n_port_b = module->LogicNot(cell->name.str() + "_t_1_2", port_b, false, cell->get_src_attribute());
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auto subexpr1 = module->And(cell->name.str() + "_t_1_3", is_and? port_a : n_port_a, port_b_taint, false, cell->get_src_attribute());
auto subexpr2 = module->And(cell->name.str() + "_t_1_4", is_and? port_b : n_port_b, port_a_taint, false, cell->get_src_attribute());
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auto subexpr3 = module->And(cell->name.str() + "_t_1_5", port_a_taint, port_b_taint, false, cell->get_src_attribute());
auto subexpr4 = module->Or(cell->name.str() + "_t_1_6", subexpr1, subexpr2, false, cell->get_src_attribute());
module->addOr(cell->name.str() + "_t_1_7", subexpr4, subexpr3, port_y_taint, false, cell->get_src_attribute());
}
void add_imprecise_GLIFT_logic_1(const RTLIL::Cell *cell, RTLIL::SigSpec &port_a, RTLIL::SigSpec &port_a_taint, RTLIL::SigSpec &port_b, RTLIL::SigSpec &port_b_taint, RTLIL::SigSpec &port_y_taint) {
//AKA AN2_SH3 or OR2_SH3
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bool is_and = cell->type.in(ID($_AND_), ID($_NAND_));
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RTLIL::SigSpec n_port_a = module->LogicNot(cell->name.str() + "_t_2_1", port_a, false, cell->get_src_attribute());
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auto subexpr1 = module->And(cell->name.str() + "_t_2_2", is_and? port_b : n_port_a, is_and? port_a_taint : port_b_taint, false, cell->get_src_attribute());
module->addOr(cell->name.str() + "_t_2_3", is_and? port_b_taint : port_a_taint, subexpr1, port_y_taint, false, cell->get_src_attribute());
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}
void add_imprecise_GLIFT_logic_2(const RTLIL::Cell *cell, RTLIL::SigSpec &port_a, RTLIL::SigSpec &port_a_taint, RTLIL::SigSpec &port_b, RTLIL::SigSpec &port_b_taint, RTLIL::SigSpec &port_y_taint) {
//AKA AN2_SH4 or OR2_SH4
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bool is_and = cell->type.in(ID($_AND_), ID($_NAND_));
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RTLIL::SigSpec n_port_b = module->LogicNot(cell->name.str() + "_t_3_1", port_b, false, cell->get_src_attribute());
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auto subexpr1 = module->And(cell->name.str() + "_t_3_2", is_and? port_a : n_port_b, is_and? port_b_taint : port_a_taint, false, cell->get_src_attribute());
module->addOr(cell->name.str() + "_t_3_3", is_and? port_a_taint : port_b_taint, subexpr1, port_y_taint, false, cell->get_src_attribute());
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}
void add_imprecise_GLIFT_logic_3(const RTLIL::Cell *cell, RTLIL::SigSpec &port_a_taint, RTLIL::SigSpec &port_b_taint, RTLIL::SigSpec &port_y_taint) {
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//AKA AN2_SH5 or OR2_SH5 or XR2_SH2
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module->addOr(cell->name.str() + "_t_4_1", port_a_taint, port_b_taint, port_y_taint, false, cell->get_src_attribute());
}
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void add_imprecise_GLIFT_logic_4(RTLIL::SigSpec &port_a_taint, RTLIL::SigSpec &port_y_taint) {
module->connect(port_y_taint, port_a_taint);
}
void add_imprecise_GLIFT_logic_5(RTLIL::SigSpec &port_b_taint, RTLIL::SigSpec &port_y_taint) {
module->connect(port_y_taint, port_b_taint);
}
void add_imprecise_GLIFT_logic_6(RTLIL::SigSpec &port_y_taint) {
module->connect(port_y_taint, RTLIL::Const(1, 1));
}
void add_imprecise_GLIFT_logic_7(RTLIL::SigSpec &port_y_taint) {
module->connect(port_y_taint, RTLIL::Const(0, 1));
}
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void add_precise_GLIFT_mux(const RTLIL::Cell *cell, RTLIL::SigSpec &port_a, RTLIL::SigSpec &port_a_taint, RTLIL::SigSpec &port_b, RTLIL::SigSpec &port_b_taint, RTLIL::SigSpec &port_s, RTLIL::SigSpec &port_s_taint, RTLIL::SigSpec &port_y_taint) {
//S&At | ~S&Bt | ~A&B&St | A&~B&St | At&St | Bt&St
RTLIL::SigSpec n_port_a = module->LogicNot(cell->name.str() + "_t_4_1", port_a, false, cell->get_src_attribute());
RTLIL::SigSpec n_port_b = module->LogicNot(cell->name.str() + "_t_4_2", port_b, false, cell->get_src_attribute());
RTLIL::SigSpec n_port_s = module->LogicNot(cell->name.str() + "_t_4_3", port_s, false, cell->get_src_attribute());
auto subexpr1 = module->And(cell->name.str() + "_t_4_4", port_s, port_a_taint, false, cell->get_src_attribute());
auto subexpr2 = module->And(cell->name.str() + "_t_4_5", n_port_s, port_b_taint, false, cell->get_src_attribute());
auto subexpr3 = module->And(cell->name.str() + "_t_4_6", n_port_a, port_b, false, cell->get_src_attribute());
auto subexpr4 = module->And(cell->name.str() + "_t_4_7", subexpr3, port_s_taint, false, cell->get_src_attribute());
auto subexpr5 = module->And(cell->name.str() + "_t_4_8", port_a, n_port_b, false, cell->get_src_attribute());
auto subexpr6 = module->And(cell->name.str() + "_t_4_9", subexpr5, port_s_taint, false, cell->get_src_attribute());
auto subexpr7 = module->And(cell->name.str() + "_t_4_10", port_a_taint, port_s_taint, false, cell->get_src_attribute());
auto subexpr8 = module->And(cell->name.str() + "_t_4_11", port_b_taint, port_s_taint, false, cell->get_src_attribute());
auto subexpr9 = module->Or(cell->name.str() + "_t_4_12", subexpr1, subexpr2, false, cell->get_src_attribute());
auto subexpr10 = module->Or(cell->name.str() + "_t_4_13", subexpr4, subexpr6, false, cell->get_src_attribute());
auto subexpr11 = module->Or(cell->name.str() + "_t_4_14", subexpr7, subexpr8, false, cell->get_src_attribute());
auto subexpr12 = module->Or(cell->name.str() + "_t_4_15", subexpr9, subexpr10, false, cell->get_src_attribute());
module->addOr(cell->name.str() + "_t_4_16", subexpr11, subexpr12, port_y_taint, false, cell->get_src_attribute());
}
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RTLIL::SigSpec score_metamux_select(const RTLIL::SigSpec &metamux_select, const RTLIL::IdString celltype) {
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log_assert(metamux_select.is_wire());
glift: Add `-simple-cost-model` option Rather than assigning specific weights to specific versions of taint tracking logic and summing the weights of all GLIFT cells, sum the following values for each GLIFT cell: - 0 if the associated hole/$anyconst cell value is non-zero, i.e. reduced-precision taint tracking logic is chosen at this cell - 1 if the associated hole/$anyconst cell value is zero, i.e. the full-precision taint tracking logic is chosen at this cell This simplified cost modeling reduces the potential for the QBF-SAT solver to minimize taint tracking logic area but significantly simplifies the QBF-SAT problem.
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if (opt_simplecostmodel) {
//The complex model is an area model, so a lower score should mean smaller.
//In this case, a nonzero hole metamux select value means less logic.
//Thus we should invert the ReduceOr over the metamux_select signal.
RTLIL::SigSpec pmux_select = module->ReduceOr(metamux_select.as_wire()->name.str() + "_nonzero", metamux_select);
return module->Pmux(NEW_ID, RTLIL::Const(1), RTLIL::Const(0), pmux_select, metamux_select.as_wire()->get_src_attribute());
} else {
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auto select_width = metamux_select.as_wire()->width;
std::vector<RTLIL::Const> costs;
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if (celltype == ID($_AND_) || celltype == ID($_OR_)) {
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costs = {5, 2, 2, 1, 0, 0, 0, 0};
log_assert(select_width == 2 || select_width == 3);
log_assert(opt_instrumentmore || select_width == 2);
log_assert(!opt_instrumentmore || select_width == 3);
}
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else if (celltype == ID($_XOR_) || celltype == ID($_XNOR_)) {
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costs = {1, 0, 0, 0};
log_assert(select_width == 2);
}
glift: Add `-simple-cost-model` option Rather than assigning specific weights to specific versions of taint tracking logic and summing the weights of all GLIFT cells, sum the following values for each GLIFT cell: - 0 if the associated hole/$anyconst cell value is non-zero, i.e. reduced-precision taint tracking logic is chosen at this cell - 1 if the associated hole/$anyconst cell value is zero, i.e. the full-precision taint tracking logic is chosen at this cell This simplified cost modeling reduces the potential for the QBF-SAT solver to minimize taint tracking logic area but significantly simplifies the QBF-SAT problem.
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glift: Add support for $_XOR_ and $_XNOR_ cells.
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std::vector<RTLIL::SigSpec> next_pmux_y_ports, pmux_y_ports(costs.begin(), costs.begin() + exp2(select_width));
glift: Add `-simple-cost-model` option Rather than assigning specific weights to specific versions of taint tracking logic and summing the weights of all GLIFT cells, sum the following values for each GLIFT cell: - 0 if the associated hole/$anyconst cell value is non-zero, i.e. reduced-precision taint tracking logic is chosen at this cell - 1 if the associated hole/$anyconst cell value is zero, i.e. the full-precision taint tracking logic is chosen at this cell This simplified cost modeling reduces the potential for the QBF-SAT solver to minimize taint tracking logic area but significantly simplifies the QBF-SAT problem.
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for (auto i = 0; pmux_y_ports.size() > 1; ++i) {
for (auto j = 0; j+1 < GetSize(pmux_y_ports); j += 2) {
next_pmux_y_ports.emplace_back(module->Pmux(stringf("%s_mux_%d_%d", metamux_select.as_wire()->name.c_str(), i, j), pmux_y_ports[j], pmux_y_ports[j+1], metamux_select[GetSize(metamux_select) - 1 - i], metamux_select.as_wire()->get_src_attribute()));
}
if (GetSize(pmux_y_ports) % 2 == 1)
next_pmux_y_ports.push_back(pmux_y_ports[GetSize(pmux_y_ports) - 1]);
pmux_y_ports.swap(next_pmux_y_ports);
next_pmux_y_ports.clear();
glift: Add `-instrument-more` option to add 4 more versions of taint tracking logic. Also refactor a bit and update help text.
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}
glift: Add `-simple-cost-model` option Rather than assigning specific weights to specific versions of taint tracking logic and summing the weights of all GLIFT cells, sum the following values for each GLIFT cell: - 0 if the associated hole/$anyconst cell value is non-zero, i.e. reduced-precision taint tracking logic is chosen at this cell - 1 if the associated hole/$anyconst cell value is zero, i.e. the full-precision taint tracking logic is chosen at this cell This simplified cost modeling reduces the potential for the QBF-SAT solver to minimize taint tracking logic area but significantly simplifies the QBF-SAT problem.
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log_assert(pmux_y_ports.size() == 1);
return pmux_y_ports[0];
}
glift: Add replacement scoring and area minimization option.
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}
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void create_glift_logic() {
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if (module->get_bool_attribute(glift_attribute_name))
return;
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std::vector<RTLIL::SigSig> connections(module->connections());
for(auto &cell : module->cells().to_vector()) {
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if (!cell->type.in(ID($_AND_), ID($_NAND_), ID($_OR_), ID($_NOR_), ID($_XOR_), ID($_XNOR_), ID($_MUX_), ID($_NMUX_), ID($_NOT_), ID($anyconst), ID($allconst), ID($assume), ID($assert)) && module->design->module(cell->type) == nullptr) {
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log_cmd_error("Unsupported cell type \"%s\" found. Run `techmap` first.\n", cell->type.c_str());
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}
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if (cell->type.in(ID($_AND_), ID($_NAND_), ID($_OR_), ID($_NOR_))) {
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const unsigned int A = 0, B = 1, Y = 2;
const unsigned int NUM_PORTS = 3;
RTLIL::SigSpec ports[NUM_PORTS] = {cell->getPort(ID::A), cell->getPort(ID::B), cell->getPort(ID::Y)};
RTLIL::SigSpec port_taints[NUM_PORTS];
if (ports[A].size() != 1 || ports[B].size() != 1 || ports[Y].size() != 1)
log_cmd_error("Multi-bit signal found. Run `splitnets` first.\n");
for (unsigned int i = 0; i < NUM_PORTS; ++i)
port_taints[i] = get_corresponding_taint_signal(ports[i]);
glift: Change command names to better represent their functions.
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if (opt_create_precise_model)
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add_precise_GLIFT_logic(cell, ports[A], port_taints[A], ports[B], port_taints[B], port_taints[Y]);
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else if (opt_create_imprecise_model)
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add_imprecise_GLIFT_logic_3(cell, port_taints[A], port_taints[B], port_taints[Y]);
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else if (opt_create_instrumented_model) {
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std::vector<RTLIL::SigSpec> taint_version;
int num_versions = opt_instrumentmore? 8 : 4;
for (auto i = 1; i <= num_versions; ++i)
taint_version.emplace_back(RTLIL::SigSpec(module->addWire(stringf("%s_y%d", cell->name.c_str(), i), 1)));
for (auto i = 0; i < num_versions; ++i) {
switch(i) {
case 0: add_precise_GLIFT_logic(cell, ports[A], port_taints[A], ports[B], port_taints[B], taint_version[i]);
break;
case 1: add_imprecise_GLIFT_logic_1(cell, ports[A], port_taints[A], ports[B], port_taints[B], taint_version[i]);
break;
case 2: add_imprecise_GLIFT_logic_2(cell, ports[A], port_taints[A], ports[B], port_taints[B], taint_version[i]);
break;
case 3: add_imprecise_GLIFT_logic_3(cell, port_taints[A], port_taints[B], taint_version[i]);
break;
case 4: add_imprecise_GLIFT_logic_4(port_taints[A], taint_version[i]);
break;
case 5: add_imprecise_GLIFT_logic_5(port_taints[B], taint_version[i]);
break;
case 6: add_imprecise_GLIFT_logic_6(taint_version[i]);
break;
case 7: add_imprecise_GLIFT_logic_7(taint_version[i]);
break;
default: log_assert(false);
}
}
auto select_width = log2(num_versions);
log_assert(exp2(select_width) == num_versions);
RTLIL::SigSpec meta_mux_select(module->addWire(cell->name.str() + "_sel", select_width));
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meta_mux_selects.push_back(make_pair(meta_mux_select, cell->type));
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module->connect(meta_mux_select, module->Anyconst(cell->name.str() + "_hole", select_width, cell->get_src_attribute()));
std::vector<RTLIL::SigSpec> next_meta_mux_y_ports, meta_mux_y_ports(taint_version);
for (auto i = 0; meta_mux_y_ports.size() > 1; ++i) {
for (auto j = 0; j+1 < GetSize(meta_mux_y_ports); j += 2) {
next_meta_mux_y_ports.emplace_back(module->Mux(stringf("%s_mux_%d_%d", cell->name.c_str(), i, j), meta_mux_y_ports[j], meta_mux_y_ports[j+1], meta_mux_select[GetSize(meta_mux_select) - 1 - i]));
}
if (GetSize(meta_mux_y_ports) % 2 == 1)
next_meta_mux_y_ports.push_back(meta_mux_y_ports[GetSize(meta_mux_y_ports) - 1]);
meta_mux_y_ports.swap(next_meta_mux_y_ports);
next_meta_mux_y_ports.clear();
}
log_assert(meta_mux_y_ports.size() == 1);
module->connect(port_taints[Y], meta_mux_y_ports[0]);
glift: Initial implementation of GLIFT model construction.
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}
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else log_cmd_error("This is a bug (1).\n");
glift: Initial implementation of GLIFT model construction.
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}
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else if (cell->type.in(ID($_XOR_), ID($_XNOR_))) {
glift: Add support for $_XOR_ and $_XNOR_ cells.
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const unsigned int A = 0, B = 1, Y = 2;
const unsigned int NUM_PORTS = 3;
RTLIL::SigSpec ports[NUM_PORTS] = {cell->getPort(ID::A), cell->getPort(ID::B), cell->getPort(ID::Y)};
RTLIL::SigSpec port_taints[NUM_PORTS];
if (ports[A].size() != 1 || ports[B].size() != 1 || ports[Y].size() != 1)
log_cmd_error("Multi-bit signal found. Run `splitnets` first.\n");
for (unsigned int i = 0; i < NUM_PORTS; ++i)
port_taints[i] = get_corresponding_taint_signal(ports[i]);
if (opt_create_precise_model || opt_create_imprecise_model)
add_imprecise_GLIFT_logic_3(cell, port_taints[A], port_taints[B], port_taints[Y]);
else if (opt_create_instrumented_model) {
std::vector<RTLIL::SigSpec> taint_version;
int num_versions = 4;
auto select_width = log2(num_versions);
log_assert(exp2(select_width) == num_versions);
for (auto i = 1; i <= num_versions; ++i)
taint_version.emplace_back(RTLIL::SigSpec(module->addWire(stringf("%s_y%d", cell->name.c_str(), i), 1)));
for (auto i = 0; i < num_versions; ++i) {
switch(i) {
case 0: add_imprecise_GLIFT_logic_3(cell, port_taints[A], port_taints[B], taint_version[i]);
break;
case 1: add_imprecise_GLIFT_logic_4(port_taints[A], taint_version[i]);
break;
case 2: add_imprecise_GLIFT_logic_5(port_taints[B], taint_version[i]);
break;
case 3: add_imprecise_GLIFT_logic_6(taint_version[i]);
break;
default: log_assert(false);
}
}
RTLIL::SigSpec meta_mux_select(module->addWire(cell->name.str() + "_sel", select_width));
meta_mux_selects.push_back(make_pair(meta_mux_select, cell->type));
module->connect(meta_mux_select, module->Anyconst(cell->name.str() + "_hole", select_width, cell->get_src_attribute()));
std::vector<RTLIL::SigSpec> next_meta_mux_y_ports, meta_mux_y_ports(taint_version);
for (auto i = 0; meta_mux_y_ports.size() > 1; ++i) {
for (auto j = 0; j+1 < GetSize(meta_mux_y_ports); j += 2) {
next_meta_mux_y_ports.emplace_back(module->Mux(stringf("%s_mux_%d_%d", cell->name.c_str(), i, j), meta_mux_y_ports[j], meta_mux_y_ports[j+1], meta_mux_select[GetSize(meta_mux_select) - 1 - i]));
}
if (GetSize(meta_mux_y_ports) % 2 == 1)
next_meta_mux_y_ports.push_back(meta_mux_y_ports[GetSize(meta_mux_y_ports) - 1]);
meta_mux_y_ports.swap(next_meta_mux_y_ports);
next_meta_mux_y_ports.clear();
}
log_assert(meta_mux_y_ports.size() == 1);
module->connect(port_taints[Y], meta_mux_y_ports[0]);
}
else log_cmd_error("This is a bug (2).\n");
}
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else if (cell->type.in(ID($_MUX_), ID($_NMUX_))) {
glift: Add support for $_MUX_ and $_NMUX_ cells.
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const unsigned int A = 0, B = 1, S = 2, Y = 3;
const unsigned int NUM_PORTS = 4;
RTLIL::SigSpec ports[NUM_PORTS] = {cell->getPort(ID::A), cell->getPort(ID::B), cell->getPort(ID::S), cell->getPort(ID::Y)};
RTLIL::SigSpec port_taints[NUM_PORTS];
if (ports[A].size() != 1 || ports[B].size() != 1 || ports[S].size() != 1 || ports[Y].size() != 1)
log_cmd_error("Multi-bit signal found. Run `splitnets` first.\n");
for (unsigned int i = 0; i < NUM_PORTS; ++i)
port_taints[i] = get_corresponding_taint_signal(ports[i]);
add_precise_GLIFT_mux(cell, ports[A], port_taints[A], ports[B], port_taints[B], ports[S], port_taints[S], port_taints[Y]);
}
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else if (cell->type.in(ID($_NOT_))) {
glift: Initial implementation of GLIFT model construction.
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const unsigned int A = 0, Y = 1;
const unsigned int NUM_PORTS = 2;
RTLIL::SigSpec ports[NUM_PORTS] = {cell->getPort(ID::A), cell->getPort(ID::Y)};
RTLIL::SigSpec port_taints[NUM_PORTS];
if (ports[A].size() != 1 || ports[Y].size() != 1)
log_cmd_error("Multi-bit signal found. Run `splitnets` first.\n");
for (unsigned int i = 0; i < NUM_PORTS; ++i)
port_taints[i] = get_corresponding_taint_signal(ports[i]);
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if (cell->type == ID($_NOT_)) {
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module->connect(port_taints[Y], port_taints[A]);
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}
glift: Add support for $_XOR_ and $_XNOR_ cells.
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else log_cmd_error("This is a bug (3).\n");
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}
glift: Add initial hierarchy support.
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else if (module->design->module(cell->type) != nullptr) {
//User cell type
//This function is called on modules according to topological order, so we do not need to
//recurse to GLIFT model the child module. However, we need to augment the ports list
//with taint signals and connect the new ports to the corresponding taint signals.
RTLIL::Module *cell_module_def = module->design->module(cell->type);
dict<RTLIL::IdString, RTLIL::SigSpec> orig_ports = cell->connections();
log("Adding cell %s\n", cell_module_def->name.c_str());
for (auto &it : orig_ports) {
RTLIL::SigSpec port = it.second;
RTLIL::SigSpec port_taint = get_corresponding_taint_signal(port);
log_assert(port_taint.is_wire());
log_assert(std::find(cell_module_def->ports.begin(), cell_module_def->ports.end(), port_taint.as_wire()->name) != cell_module_def->ports.end());
cell->setPort(port_taint.as_wire()->name, port_taint);
}
}
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else log_cmd_error("This is a bug (4).\n");
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} //end foreach cell in cells
for (auto &conn : connections) {
RTLIL::SigSpec first = get_corresponding_taint_signal(conn.first);
RTLIL::SigSpec second = get_corresponding_taint_signal(conn.second);
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module->connect(first, second);
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if(conn.second.is_wire() && conn.second.as_wire()->port_input)
second.as_wire()->port_input = true;
if(conn.first.is_wire() && conn.first.as_wire()->port_output)
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new_taint_outputs.push_back(first.as_wire());
glift: Initial implementation of GLIFT model construction.
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} //end foreach conn in connections
glift: Add `-simple-cost-model` option Rather than assigning specific weights to specific versions of taint tracking logic and summing the weights of all GLIFT cells, sum the following values for each GLIFT cell: - 0 if the associated hole/$anyconst cell value is non-zero, i.e. reduced-precision taint tracking logic is chosen at this cell - 1 if the associated hole/$anyconst cell value is zero, i.e. the full-precision taint tracking logic is chosen at this cell This simplified cost modeling reduces the potential for the QBF-SAT solver to minimize taint tracking logic area but significantly simplifies the QBF-SAT problem.
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//Create a rough model of area by summing the (potentially simplified) "weight" score of each meta-mux select:
glift: Add `-create-imprecise` command, rename other commands, and re-work the help text.
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if (!opt_nocostmodel) {
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std::vector<RTLIL::SigSpec> meta_mux_select_sums;
std::vector<RTLIL::SigSpec> meta_mux_select_sums_buf;
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for (auto &it : meta_mux_selects) {
meta_mux_select_sums.emplace_back(score_metamux_select(it.first, it.second));
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}
for (unsigned int i = 0; meta_mux_select_sums.size() > 1; ) {
meta_mux_select_sums_buf.clear();
for (i = 0; i + 1 < meta_mux_select_sums.size(); i += 2) {
meta_mux_select_sums_buf.push_back(module->Add(meta_mux_select_sums[i].as_wire()->name.str() + "_add", meta_mux_select_sums[i], meta_mux_select_sums[i+1], false));
}
if (meta_mux_select_sums.size() % 2 == 1)
meta_mux_select_sums_buf.push_back(meta_mux_select_sums[meta_mux_select_sums.size()-1]);
meta_mux_select_sums.swap(meta_mux_select_sums_buf);
}
if (meta_mux_select_sums.size() > 0) {
meta_mux_select_sums[0].as_wire()->set_bool_attribute("\\minimize");
meta_mux_select_sums[0].as_wire()->set_bool_attribute("\\keep");
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module->rename(meta_mux_select_sums[0].as_wire(), cost_model_wire_name);
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}
}
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//Mark new module outputs:
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for (auto &port_name : module->ports) {
RTLIL::Wire *port = module->wire(port_name);
log_assert(port != nullptr);
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if (is_top_module && port->port_output && !opt_keepoutputs)
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port->port_output = false;
}
for (auto &output : new_taint_outputs)
output->port_output = true;
glift: Initial implementation of GLIFT model construction.
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module->fixup_ports(); //we have some new taint signals in the module interface
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module->set_bool_attribute(glift_attribute_name, true);
glift: Initial implementation of GLIFT model construction.
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}
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public:
GliftWorker(RTLIL::Module *_module, bool _is_top_module, bool _opt_create_precise_model, bool _opt_create_imprecise_model, bool _opt_create_instrumented_model, bool _opt_taintconstants, bool _opt_keepoutputs, bool _opt_simplecostmodel, bool _opt_nocostmodel, bool _opt_instrumentmore) {
module = _module;
is_top_module = _is_top_module;
opt_create_precise_model = _opt_create_precise_model;
opt_create_imprecise_model = _opt_create_imprecise_model;
opt_create_instrumented_model = _opt_create_instrumented_model;
opt_taintconstants = _opt_taintconstants;
opt_keepoutputs = _opt_keepoutputs;
opt_simplecostmodel = _opt_simplecostmodel;
opt_nocostmodel = _opt_nocostmodel;
opt_instrumentmore = _opt_instrumentmore;
create_glift_logic();
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}
glift: Use worker pattern.
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};
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glift: Use worker pattern.
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struct GliftPass : public Pass {
GliftPass() : Pass("glift", "create GLIFT models and optimization problems") {}
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glift: Replace `YS_OVERRIDE` with `override`.
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void help() override
glift: Add skeleton for `glift` command.
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{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
glift: Add `-create-imprecise` command, rename other commands, and re-work the help text.
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log(" glift <command> [options] [selection]\n");
log("\n");
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log("Augments the current or specified module with gate-level information flow \n");
log("tracking (GLIFT) logic using the \"constructive mapping\" approach. Also can set\n");
log("up QBF-SAT optimization problems in order to optimize GLIFT models or trade off\n");
log("precision and complexity.\n");
glift: Add skeleton for `glift` command.
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log("\n");
log("\n");
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log("Commands:\n");
glift: Add skeleton for `glift` command.
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log("\n");
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log(" -create-precise-model\n");
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log(" Replaces the current or specified module with one that has corresponding\n");
log(" \"taint\" inputs, outputs, and internal nets along with precise taint\n");
log(" tracking logic. For example, precise taint tracking logic for an AND gate\n");
log(" is:\n");
glift: Add `-instrument-more` option to add 4 more versions of taint tracking logic. Also refactor a bit and update help text.
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log("\n");
log(" y_t = a & b_t | b & a_t | a_t & b_t\n");
log("\n");
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log("\n");
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log(" -create-imprecise-model\n");
Fitting help messages to 80 character width Uses the regex below to search (using vscode): ^\t\tlog\("(.{10,}(?<!\\n)|.{81,}\\n)"\); Finds any log messages double indented (which help messages are) and checks if *either* there are is no newline character at the end, *or* the number of characters before the newline is more than 80.
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log(" Replaces the current or specified module with one that has corresponding\n");
log(" \"taint\" inputs, outputs, and internal nets along with imprecise \"All OR\"\n");
log(" taint tracking logic:\n");
glift: Add `-instrument-more` option to add 4 more versions of taint tracking logic. Also refactor a bit and update help text.
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log("\n");
log(" y_t = a_t | b_t\n");
log("\n");
glift: Add `-create-imprecise` command, rename other commands, and re-work the help text.
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log("\n");
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log(" -create-instrumented-model\n");
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log(" Replaces the current or specified module with one that has corresponding\n");
log(" \"taint\" inputs, outputs, and internal nets along with 4 varying-precision\n");
log(" versions of taint tracking logic. Which version of taint tracking logic is\n");
log(" used for a given gate is determined by a MUX selected by an $anyconst cell.\n");
log(" By default, unless the `-no-cost-model` option is provided, an additional\n");
log(" wire named `__glift_weight` with the `keep` and `minimize` attributes is\n");
log(" added to the module along with pmuxes and adders to calculate a rough\n");
log(" estimate of the number of logic gates in the GLIFT model given an assignment\n");
log(" for the $anyconst cells. The four versions of taint tracking logic for an\n");
log(" AND gate are:\n");
log(" y_t = a & b_t | b & a_t | a_t & b_t (like `-create-precise-model`)\n");
glift: Add `-instrument-more` option to add 4 more versions of taint tracking logic. Also refactor a bit and update help text.
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log(" y_t = a_t | a & b_t\n");
log(" y_t = b_t | b & a_t\n");
Fitting help messages to 80 character width Uses the regex below to search (using vscode): ^\t\tlog\("(.{10,}(?<!\\n)|.{81,}\\n)"\); Finds any log messages double indented (which help messages are) and checks if *either* there are is no newline character at the end, *or* the number of characters before the newline is more than 80.
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log(" y_t = a_t | b_t (like `-create-imprecise-model`)\n");
glift: Add `-create-imprecise` command, rename other commands, and re-work the help text.
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log("\n");
glift: Initial implementation of the `-sketchify` option.
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log("\n");
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log("Options:\n");
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log("\n");
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log(" -taint-constants\n");
glift: Initial implementation of GLIFT model construction.
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log(" Constant values in the design are labeled as tainted.\n");
log(" (default: label constants as un-tainted)\n");
log("\n");
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log(" -keep-outputs\n");
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log(" Do not remove module outputs. Taint tracking outputs will appear in the\n");
log(" module ports alongside the orignal outputs.\n");
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log(" (default: original module outputs are removed)\n");
log("\n");
glift: Add `-simple-cost-model` option Rather than assigning specific weights to specific versions of taint tracking logic and summing the weights of all GLIFT cells, sum the following values for each GLIFT cell: - 0 if the associated hole/$anyconst cell value is non-zero, i.e. reduced-precision taint tracking logic is chosen at this cell - 1 if the associated hole/$anyconst cell value is zero, i.e. the full-precision taint tracking logic is chosen at this cell This simplified cost modeling reduces the potential for the QBF-SAT solver to minimize taint tracking logic area but significantly simplifies the QBF-SAT problem.
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log(" -simple-cost-model\n");
Fitting help messages to 80 character width Uses the regex below to search (using vscode): ^\t\tlog\("(.{10,}(?<!\\n)|.{81,}\\n)"\); Finds any log messages double indented (which help messages are) and checks if *either* there are is no newline character at the end, *or* the number of characters before the newline is more than 80.
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log(" Do not model logic area. Instead model the number of non-zero assignments to\n");
log(" $anyconsts. Taint tracking logic versions vary in their size, but all\n");
log(" reduced-precision versions are significantly smaller than the fully-precise\n");
log(" version. A non-zero $anyconst assignment means that reduced-precision taint\n");
log(" tracking logic was chosen for some gate. Only applicable in combination with\n");
log(" `-create-instrumented-model`. (default: use a complex model and give that\n");
log(" wire the \"keep\" and \"minimize\" attributes)\n");
glift: Add `-simple-cost-model` option Rather than assigning specific weights to specific versions of taint tracking logic and summing the weights of all GLIFT cells, sum the following values for each GLIFT cell: - 0 if the associated hole/$anyconst cell value is non-zero, i.e. reduced-precision taint tracking logic is chosen at this cell - 1 if the associated hole/$anyconst cell value is zero, i.e. the full-precision taint tracking logic is chosen at this cell This simplified cost modeling reduces the potential for the QBF-SAT solver to minimize taint tracking logic area but significantly simplifies the QBF-SAT problem.
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log("\n");
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log(" -no-cost-model\n");
Fitting help messages to 80 character width Uses the regex below to search (using vscode): ^\t\tlog\("(.{10,}(?<!\\n)|.{81,}\\n)"\); Finds any log messages double indented (which help messages are) and checks if *either* there are is no newline character at the end, *or* the number of characters before the newline is more than 80.
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log(" Do not model taint tracking logic area and do not create a `__glift_weight`\n");
log(" wire. Only applicable in combination with `-create-instrumented-model`.\n");
log(" (default: model area and give that wire the \"keep\" and \"minimize\"\n");
log(" attributes)\n");
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log("\n");
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log(" -instrument-more\n");
Fitting help messages to 80 character width Uses the regex below to search (using vscode): ^\t\tlog\("(.{10,}(?<!\\n)|.{81,}\\n)"\); Finds any log messages double indented (which help messages are) and checks if *either* there are is no newline character at the end, *or* the number of characters before the newline is more than 80.
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log(" Allow choice from more versions of (even simpler) taint tracking logic. A\n");
log(" total of 8 versions of taint tracking logic will be added per gate,\n");
log(" including the 4 versions from `-create-instrumented-model` and these\n");
log(" additional versions:\n");
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log("\n");
log(" y_t = a_t\n");
log(" y_t = b_t\n");
log(" y_t = 1\n");
log(" y_t = 0\n");
log("\n");
log(" Only applicable in combination with `-create-instrumented-model`.\n");
log(" (default: do not add more versions of taint tracking logic.\n");
log("\n");
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}
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glift: Use worker pattern.
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void execute(std::vector<std::string> args, RTLIL::Design *design) override
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{
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bool opt_create_precise_model = false, opt_create_imprecise_model = false, opt_create_instrumented_model = false;
bool opt_taintconstants = false, opt_keepoutputs = false, opt_simplecostmodel = false, opt_nocostmodel = false;
bool opt_instrumentmore = false;
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log_header(design, "Executing GLIFT pass (creating and manipulating GLIFT models).\n");
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std::vector<std::string>::size_type argidx;
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for (argidx = 1; argidx < args.size(); argidx++) {
if (args[argidx] == "-create-precise-model") {
opt_create_precise_model = true;
continue;
}
if (args[argidx] == "-create-imprecise-model") {
opt_create_imprecise_model = true;
continue;
}
if (args[argidx] == "-create-instrumented-model") {
opt_create_instrumented_model = true;
continue;
}
if (args[argidx] == "-taint-constants") {
opt_taintconstants = true;
continue;
}
if (args[argidx] == "-keep-outputs") {
opt_keepoutputs = true;
continue;
}
if (args[argidx] == "-simple-cost-model") {
opt_simplecostmodel = true;
continue;
}
if (args[argidx] == "-no-cost-model") {
opt_nocostmodel = true;
continue;
}
if (args[argidx] == "-instrument-more") {
opt_instrumentmore = true;
continue;
}
break;
}
if(!opt_create_precise_model && !opt_create_imprecise_model && !opt_create_instrumented_model)
log_cmd_error("No command provided. See help for usage.\n");
if(static_cast<int>(opt_create_precise_model) + static_cast<int>(opt_create_imprecise_model) + static_cast<int>(opt_create_instrumented_model) != 1)
log_cmd_error("Only one command may be specified. See help for usage.\n");
if(opt_simplecostmodel && opt_nocostmodel)
log_cmd_error("Only one of `-simple-cost-model` and `-no-cost-model` may be specified. See help for usage.\n");
if((opt_simplecostmodel || opt_nocostmodel) && !opt_create_instrumented_model)
log_cmd_error("Options `-simple-cost-model` and `-no-cost-model` may only be used with `-create-instrumented-model`. See help for usage.\n");
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extra_args(args, argidx, design);
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if (GetSize(design->selected_modules()) == 0)
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log_cmd_error("Can't operate on an empty selection!\n");
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TopoSort<RTLIL::Module*, IdString::compare_ptr_by_name<RTLIL::Module>> topo_modules; //cribbed from passes/techmap/flatten.cc
auto worklist = design->selected_modules();
pool<RTLIL::IdString> non_top_modules;
while (!worklist.empty()) {
RTLIL::Module *module = *(worklist.begin());
worklist.erase(worklist.begin());
topo_modules.node(module);
for (auto cell : module->selected_cells()) {
RTLIL::Module *tpl = design->module(cell->type);
if (tpl != nullptr) {
Fix translation bug: The old code really checks for the presense of a node, not an edge in glift and flatten. Add back statement that inserts nodes in order in opt_expr.cc.
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if (!topo_modules.has_node(tpl))
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worklist.push_back(tpl);
topo_modules.edge(tpl, module);
non_top_modules.insert(cell->type);
}
}
}
if (!topo_modules.sort())
log_cmd_error("Cannot handle recursive module instantiations.\n");
for (auto i = 0; i < GetSize(topo_modules.sorted); ++i) {
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RTLIL::Module *module = topo_modules.sorted[i];
GliftWorker(module, !non_top_modules[module->name], opt_create_precise_model, opt_create_imprecise_model, opt_create_instrumented_model, opt_taintconstants, opt_keepoutputs, opt_simplecostmodel, opt_nocostmodel, opt_instrumentmore);
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}
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}
} GliftPass;
PRIVATE_NAMESPACE_END