147 lines
3.7 KiB
C++
147 lines
3.7 KiB
C++
#include "ModuleCache.h"
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#include "StatCache.h"
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#include "FileModule.h"
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#include "printutils.h"
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#include "openscad.h"
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#include <boost/format.hpp>
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#include <boost/filesystem.hpp>
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#include <stdio.h>
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#include <fstream>
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#include <sstream>
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#include <time.h>
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#include <sys/stat.h>
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#include <algorithm>
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namespace fs=boost::filesystem;
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//#include "parsersettings.h"
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/*!
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FIXME: Implement an LRU scheme to avoid having an ever-growing module cache
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*/
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ModuleCache *ModuleCache::inst = nullptr;
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/*!
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Reevaluate the given file and all it's dependencies and recompile anything
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needing reevaluation. Updates the cache if necessary.
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The given filename must be absolute.
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Sets the module reference to the new module, or nullptr on any error (e.g. compile
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error or file not found).
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Returns the latest mod time of the modul or its dependencies or includes.
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*/
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time_t ModuleCache::evaluate(const std::string &filename, FileModule *&module)
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{
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module = nullptr;
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FileModule *lib_mod = nullptr;
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bool found = false;
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if (this->entries.find(filename) != this->entries.end()) {
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found = true;
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lib_mod = this->entries[filename].module;
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}
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// Don't try to recursively evaluate - if the file changes
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// during evaluation, that would be really bad.
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if (lib_mod && lib_mod->isHandlingDependencies()) return 0;
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// Create cache ID
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struct stat st{};
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bool valid = (StatCache::stat(filename.c_str(), &st) == 0);
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// If file isn't there, just return and let the cache retain the old module
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if (!valid) return 0;
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// If the file is present, we'll always cache some result
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std::string cache_id = str(boost::format("%x.%x") % st.st_mtime % st.st_size);
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cache_entry &entry = this->entries[filename];
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// Initialize entry, if new
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if (!found) {
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entry.module = nullptr;
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entry.last_good_module = nullptr;
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entry.cache_id = cache_id;
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entry.includes_mtime = st.st_mtime;
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}
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entry.mtime = st.st_mtime;
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bool shouldCompile = true;
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if (found) {
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// Files should only be recompiled if the cache ID changed
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if (entry.cache_id == cache_id) {
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shouldCompile = false;
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// Recompile if includes changed
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if (entry.last_good_module) {
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time_t mtime = entry.last_good_module->includesChanged();
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if (mtime > entry.includes_mtime) {
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entry.includes_mtime = mtime;
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shouldCompile = true;
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}
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}
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}
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}
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#ifdef DEBUG
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// Causes too much debug output
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//if (!shouldCompile) PRINTB("Using cached library: %s (%p)", filename % lib_mod);
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#endif
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// If cache lookup failed (non-existing or old timestamp), compile module
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if (shouldCompile) {
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#ifdef DEBUG
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if (found) {
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PRINTDB("Recompiling cached library: %s (%s)", filename % cache_id);
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}
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else {
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PRINTDB("Compiling library '%s'.", filename);
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}
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#endif
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std::stringstream textbuf;
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{
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std::ifstream ifs(filename.c_str());
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if (!ifs.is_open()) {
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PRINTB("WARNING: Can't open library file '%s'\n", filename);
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return 0;
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}
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textbuf << ifs.rdbuf();
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}
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textbuf << "\n" << commandline_commands;
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print_messages_push();
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fs::path pathname = fs::path(filename);
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lib_mod = parse(textbuf.str().c_str(), pathname, false);
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PRINTDB(" compiled module: %p", lib_mod);
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if (lib_mod) { // parse successful
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delete entry.last_good_module;
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entry.last_good_module = lib_mod;
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}
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entry.module = lib_mod;
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entry.cache_id = cache_id;
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print_messages_pop();
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}
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module = lib_mod;
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time_t deps_mtime = lib_mod ? lib_mod->handleDependencies() : 0;
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return std::max(deps_mtime, std::max(entry.mtime, entry.includes_mtime));
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}
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void ModuleCache::clear()
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{
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this->entries.clear();
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}
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FileModule *ModuleCache::lookup(const std::string &filename)
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{
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return isCached(filename) ? this->entries[filename].module : nullptr;
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}
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bool ModuleCache::isCached(const std::string &filename)
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{
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return this->entries.find(filename) != this->entries.end();
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}
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