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frontend/base: Top module handling

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2019-11-12 11:33:49 +00:00
parent fa7317f594
commit fffc3b8447
3 changed files with 96 additions and 3 deletions
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6
CMakeLists.txt
View File

@ -191,7 +191,7 @@ if (BUILD_PYTHON)
endif ()
endif()
include_directories(common/ json/ ${Boost_INCLUDE_DIRS} ${PYTHON_INCLUDE_DIRS})
include_directories(common/ json/ frontend/ ${Boost_INCLUDE_DIRS} ${PYTHON_INCLUDE_DIRS})
if(BUILD_HEAP)
find_package (Eigen3 REQUIRED NO_MODULE)
@ -202,7 +202,9 @@ endif()
aux_source_directory(common/ COMMON_SRC_FILES)
aux_source_directory(json/ JSON_PARSER_FILES)
set(COMMON_FILES ${COMMON_SRC_FILES} ${JSON_PARSER_FILES})
aux_source_directory(frontend/ FRONTEND_FILES)
set(COMMON_FILES ${COMMON_SRC_FILES} ${JSON_PARSER_FILES} ${FRONTEND_FILES})
set(CMAKE_BUILD_TYPE Release)
if(MINGW)

1
common/command.cc
View File

@ -35,6 +35,7 @@
#include <iostream>
#include "command.h"
#include "design_utils.h"
#include "frontend_base.h"
#include "jsonparse.h"
#include "jsonwrite.h"
#include "log.h"

90
frontend/generic.h → frontend/frontend_base.h
View File

@ -100,3 +100,93 @@
* returns the signal number of vector bit <i>
*
*/
#include "log.h"
#include "nextpnr.h"
NEXTPNR_NAMESPACE_BEGIN
namespace {
template <typename FrontendType> struct GenericFrontend
{
GenericFrontend(Context *ctx, const FrontendType &impl) : ctx(ctx), impl(impl) {}
Context *ctx;
const FrontendType &impl;
using mod_dat_t = typename FrontendType::ModuleDataType;
using mod_port_dat_t = typename FrontendType::ModulePortDataType;
using cell_dat_t = typename FrontendType::CellDataType;
using netname_dat_t = typename FrontendType::NetnameDataType;
using bitvector_t = typename FrontendType::BitVectorDataType;
// Used for hierarchy resolution
struct ModuleInfo
{
mod_dat_t *mod_data;
bool is_top = false, is_blackbox = false, is_whitebox = false;
inline bool is_box() const { return is_blackbox || is_whitebox; }
std::unordered_set<IdString> instantiated_celltypes;
};
std::unordered_map<IdString, ModuleInfo> mods;
IdString top;
// Process the list of modules and determine
// the top module
void find_top_module()
{
impl.foreach_module([&](const std::string &name, const mod_dat_t &mod) {
IdString mod_id = ctx->id(name);
auto &mi = mods[mod_id];
mi.mod_data = &mod;
impl.foreach_attr(mod, [&](const std::string &name, const Property &value) {
if (name == "top")
mi.is_top = (value.intval != 0);
else if (name == "blackbox")
mi.is_blackbox = (value.intval != 0);
else if (name == "whitebox")
mi.is_whitebox = (value.intval != 0);
});
impl.foreach_cell(mod, [&](const std::string &name, const cell_dat_t &cell) {
mi.instantiated_cells.insert(ctx->id(impl.get_cell_type(cell)));
});
});
// First of all, see if a top module has been manually specified
if (ctx->settings.count(ctx->id("frontend/top"))) {
IdString user_top = ctx->id(ctx->settings.at(ctx->id("frontend/top")).as_string());
if (!mods.count(user_top))
log_error("Top module '%s' not found!\n", ctx->nameOf(user_top));
top = user_top;
return;
}
// If not, look for a module with the top attribute set
IdString top_by_attr;
for (auto &mod : mods) {
if (mod.second.is_top && !mod.second.is_box()) {
if (top_by_attr != IdString())
log_error("Found multiple modules with (* top *) set (including %s and %s).\n",
ctx->nameOf(top_by_attr), ctx->nameOf(mod.first));
top_by_attr = mod.first;
}
}
if (top_by_attr != IdString()) {
top = top_by_attr;
return;
}
// Finally, attempt to autodetect the top module using hierarchy
// (a module that is not a box and is not used as a cell by any other module)
std::unordered_set<IdString> candidate_top;
for (auto &mod : mods)
if (!mod.second.is_box())
candidate_top.insert(mod.first);
for (auto &mod : mods)
for (auto &c : mod.second.instantiated_celltypes)
candidate_top.erase(c);
if (candidate_top.size() != 1)
log_error("Failed to autodetect top module, please specify using --top.\n");
top = *(candidate_top.begin());
}
};
} // namespace
template <typename FrontendType> void run_frontend(Context *ctx, const FrontendType &impl) {}
NEXTPNR_NAMESPACE_END