Mercurial > projects > ldc
view gen/configfile.cpp @ 1317:4099548c80e0
Allocate objects on the stack if they (a) don't have a destructor, and
(b) don't override the delete operator (on top of the regular conditions for
stack allocation that also apply to arrays, structs, etc.).
The "no destructor" clause is not strictly necessary, but calling them at the
right time would be tricky to say the least; it would involve, among other
things, "manually" inserting a try-finally block around anything that might
throw exceptions not caught in the current function.
Note: objects with custom new operators are automatically ignored because they
don't use the regular allocation runtime call, so there's no need to pay special
attention to them.
author | Frits van Bommel <fvbommel wxs.nl> |
---|---|
date | Sat, 09 May 2009 00:50:15 +0200 |
parents | 454f0c8acc4b |
children | b6e819244062 |
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#include <iostream> #include <string> #include <cassert> #include "llvm/System/Path.h" #include "libconfig.h++" #include "gen/configfile.h" #include "mars.h" namespace sys = llvm::sys; ConfigFile::ConfigFile() { cfg = new libconfig::Config; } ConfigFile::~ConfigFile() { delete cfg; } bool ConfigFile::read(const char* argv0, void* mainAddr, const char* filename) { // try to find the config file // 1) try the current working dir sys::Path p = sys::Path::GetCurrentDirectory(); p.appendComponent(filename); if (!p.exists()) { // 2) try the user home dir p = sys::Path::GetUserHomeDirectory(); p.appendComponent(filename); if (!p.exists()) { // 3) try the install-prefix/etc p = sys::Path(LDC_INSTALL_PREFIX); #if !_WIN32 // Does Window need something similar? p.appendComponent("etc"); #endif p.appendComponent(filename); if (!p.exists()) { // 4) try next to the executable p = sys::Path::GetMainExecutable(argv0, mainAddr); p.eraseComponent(); p.appendComponent(filename); if (!p.exists()) { // 5) fail load cfg, users still have the DFLAGS environment var std::cerr << "Error failed to locate the configuration file: " << filename << std::endl; return false; } } } } try { // read the cfg cfg->readFile(p.c_str()); // make sure there's a default group if (!cfg->exists("default")) { std::cerr << "no default settings in configuration file" << std::endl; return false; } libconfig::Setting& root = cfg->lookup("default"); if (!root.isGroup()) { std::cerr << "default is not a group" << std::endl; return false; } // handle switches if (root.exists("switches")) { libconfig::Setting& arr = cfg->lookup("default.switches"); int len = arr.getLength(); for (int i=0; i<len; i++) { const char* v = arr[i]; switches.push_back(v); } } } catch(libconfig::FileIOException& fioe) { std::cerr << "Error reading configuration file: " << filename << std::endl; return false; } catch(libconfig::ParseException& pe) { std::cerr << "Error parsing configuration file: " << filename << "(" << pe.getLine() << "): " << pe.getError() << std::endl; return false; } catch(...) { std::cerr << "Unknown exception caught!" << std::endl; return false; } return true; }