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292 lines
9.1 KiB
D
292 lines
9.1 KiB
D
/**
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* Contains the garbage collector configuration.
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*
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* Copyright: Copyright Digital Mars 2016
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* License: $(WEB www.boost.org/LICENSE_1_0.txt, Boost License 1.0).
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*/
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module gc.config;
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import core.stdc.stdlib;
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import core.stdc.stdio;
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import core.stdc.ctype;
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import core.stdc.string;
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import core.vararg;
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nothrow @nogc:
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extern extern(C) string[] rt_args();
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extern extern(C) __gshared bool rt_envvars_enabled;
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extern extern(C) __gshared bool rt_cmdline_enabled;
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extern extern(C) __gshared string[] rt_options;
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__gshared Config config;
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struct Config
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{
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bool disable; // start disabled
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ubyte profile; // enable profiling with summary when terminating program
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string gc = "conservative"; // select gc implementation conservative|manual
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size_t initReserve; // initial reserve (MB)
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size_t minPoolSize = 1; // initial and minimum pool size (MB)
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size_t maxPoolSize = 64; // maximum pool size (MB)
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size_t incPoolSize = 3; // pool size increment (MB)
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float heapSizeFactor = 2.0; // heap size to used memory ratio
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@nogc nothrow:
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bool initialize()
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{
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import core.internal.traits : externDFunc;
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alias rt_configCallBack = string delegate(string) @nogc nothrow;
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alias fn_configOption = string function(string opt, scope rt_configCallBack dg, bool reverse) @nogc nothrow;
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alias rt_configOption = externDFunc!("rt.config.rt_configOption", fn_configOption);
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string parse(string opt) @nogc nothrow
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{
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if (!parseOptions(opt))
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return "err";
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return null; // continue processing
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}
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string s = rt_configOption("gcopt", &parse, true);
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return s is null;
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}
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void help()
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{
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version (unittest) if (inUnittest) return;
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string s = "GC options are specified as white space separated assignments:
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disable:0|1 - start disabled (%d)
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profile:0|1|2 - enable profiling with summary when terminating program (%d)
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gc:conservative|manual - select gc implementation (default = conservative)
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initReserve:N - initial memory to reserve in MB (%lld)
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minPoolSize:N - initial and minimum pool size in MB (%lld)
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maxPoolSize:N - maximum pool size in MB (%lld)
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incPoolSize:N - pool size increment MB (%lld)
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heapSizeFactor:N - targeted heap size to used memory ratio (%g)
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";
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printf(s.ptr, disable, profile, cast(long)initReserve, cast(long)minPoolSize,
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cast(long)maxPoolSize, cast(long)incPoolSize, heapSizeFactor);
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}
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bool parseOptions(string opt)
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{
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opt = skip!isspace(opt);
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while (opt.length)
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{
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auto tail = find!(c => c == ':' || c == '=' || c == ' ')(opt);
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auto name = opt[0 .. $ - tail.length];
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if (name == "help")
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{
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help();
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opt = skip!isspace(tail);
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continue;
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}
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if (tail.length <= 1 || tail[0] == ' ')
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return optError("Missing argument for", name);
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tail = tail[1 .. $];
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switch (name)
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{
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foreach (field; __traits(allMembers, Config))
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{
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static if (!is(typeof(__traits(getMember, this, field)) == function))
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{
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case field:
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if (!parse(name, tail, __traits(getMember, this, field)))
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return false;
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break;
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}
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}
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break;
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default:
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return optError("Unknown", name);
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}
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opt = skip!isspace(tail);
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}
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return true;
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}
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}
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private:
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bool optError(in char[] msg, in char[] name)
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{
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version (unittest) if (inUnittest) return false;
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fprintf(stderr, "%.*s GC option '%.*s'.\n",
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cast(int)msg.length, msg.ptr,
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cast(int)name.length, name.ptr);
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return false;
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}
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inout(char)[] skip(alias pred)(inout(char)[] str)
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{
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return find!(c => !pred(c))(str);
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}
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inout(char)[] find(alias pred)(inout(char)[] str)
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{
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foreach (i; 0 .. str.length)
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if (pred(str[i])) return str[i .. $];
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return null;
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}
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bool parse(T:size_t)(const(char)[] optname, ref inout(char)[] str, ref T res)
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in { assert(str.length); }
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body
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{
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size_t i, v;
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for (; i < str.length && isdigit(str[i]); ++i)
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v = 10 * v + str[i] - '0';
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if (!i)
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return parseError("a number", optname, str);
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if (v > res.max)
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return parseError("a number " ~ T.max.stringof ~ " or below", optname, str[0 .. i]);
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str = str[i .. $];
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res = cast(T) v;
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return true;
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}
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bool parse(const(char)[] optname, ref inout(char)[] str, ref bool res)
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in { assert(str.length); }
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body
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{
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if (str[0] == '1' || str[0] == 'y' || str[0] == 'Y')
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res = true;
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else if (str[0] == '0' || str[0] == 'n' || str[0] == 'N')
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res = false;
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else
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return parseError("'0/n/N' or '1/y/Y'", optname, str);
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str = str[1 .. $];
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return true;
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}
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bool parse(const(char)[] optname, ref inout(char)[] str, ref float res)
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in { assert(str.length); }
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body
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{
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// % uint f %n \0
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char[1 + 10 + 1 + 2 + 1] fmt=void;
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// specify max-width
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immutable n = snprintf(fmt.ptr, fmt.length, "%%%uf%%n", cast(uint)str.length);
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assert(n > 4 && n < fmt.length);
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int nscanned;
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version (CRuntime_DigitalMars)
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{
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/* Older sscanf's in snn.lib can write to its first argument, causing a crash
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* if the string is in readonly memory. Recent updates to DMD
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* https://github.com/dlang/dmd/pull/6546
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* put string literals in readonly memory.
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* Although sscanf has been fixed,
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* http://ftp.digitalmars.com/snn.lib
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* this workaround is here so it still works with the older snn.lib.
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*/
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// Create mutable copy of str
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const length = str.length;
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char* mptr = cast(char*)malloc(length + 1);
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assert(mptr);
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memcpy(mptr, str.ptr, length);
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mptr[length] = 0;
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const result = sscanf(mptr, fmt.ptr, &res, &nscanned);
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free(mptr);
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if (result < 1)
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return parseError("a float", optname, str);
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}
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else
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{
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if (sscanf(str.ptr, fmt.ptr, &res, &nscanned) < 1)
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return parseError("a float", optname, str);
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}
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str = str[nscanned .. $];
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return true;
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}
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bool parse(const(char)[] optname, ref inout(char)[] str, ref inout(char)[] res)
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in { assert(str.length); }
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body
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{
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auto tail = str.find!(c => c == ':' || c == '=' || c == ' ');
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res = str[0 .. $ - tail.length];
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if (!res.length)
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return parseError("an identifier", optname, str);
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str = tail;
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return true;
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}
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bool parseError(in char[] exp, in char[] opt, in char[] got)
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{
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version (unittest) if (inUnittest) return false;
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fprintf(stderr, "Expecting %.*s as argument for GC option '%.*s', got '%.*s' instead.\n",
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cast(int)exp.length, exp.ptr,
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cast(int)opt.length, opt.ptr,
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cast(int)got.length, got.ptr);
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return false;
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}
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size_t min(size_t a, size_t b) { return a <= b ? a : b; }
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version (unittest) __gshared bool inUnittest;
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unittest
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{
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inUnittest = true;
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scope (exit) inUnittest = false;
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Config conf;
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assert(!conf.parseOptions("disable"));
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assert(!conf.parseOptions("disable:"));
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assert(!conf.parseOptions("disable:5"));
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assert(conf.parseOptions("disable:y") && conf.disable);
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assert(conf.parseOptions("disable:n") && !conf.disable);
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assert(conf.parseOptions("disable:Y") && conf.disable);
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assert(conf.parseOptions("disable:N") && !conf.disable);
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assert(conf.parseOptions("disable:1") && conf.disable);
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assert(conf.parseOptions("disable:0") && !conf.disable);
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assert(conf.parseOptions("disable=y") && conf.disable);
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assert(conf.parseOptions("disable=n") && !conf.disable);
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assert(conf.parseOptions("profile=0") && conf.profile == 0);
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assert(conf.parseOptions("profile=1") && conf.profile == 1);
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assert(conf.parseOptions("profile=2") && conf.profile == 2);
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assert(!conf.parseOptions("profile=256"));
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assert(conf.parseOptions("disable:1 minPoolSize:16"));
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assert(conf.disable);
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assert(conf.minPoolSize == 16);
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assert(conf.parseOptions("heapSizeFactor:3.1"));
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assert(conf.heapSizeFactor == 3.1f);
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assert(conf.parseOptions("heapSizeFactor:3.1234567890 disable:0"));
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assert(conf.heapSizeFactor > 3.123f);
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assert(!conf.disable);
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assert(!conf.parseOptions("heapSizeFactor:3.0.2.5"));
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assert(conf.parseOptions("heapSizeFactor:2"));
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assert(conf.heapSizeFactor == 2.0f);
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assert(!conf.parseOptions("initReserve:foo"));
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assert(!conf.parseOptions("initReserve:y"));
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assert(!conf.parseOptions("initReserve:20.5"));
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assert(conf.parseOptions("help"));
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assert(conf.parseOptions("help profile:1"));
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assert(conf.parseOptions("help profile:1 help"));
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assert(conf.parseOptions("gc:manual") && conf.gc == "manual");
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assert(conf.parseOptions("gc:my-gc~modified") && conf.gc == "my-gc~modified");
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assert(conf.parseOptions("gc:conservative help profile:1") && conf.gc == "conservative" && conf.profile == 1);
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// the config parse doesn't know all available GC names, so should accept unknown ones
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assert(conf.parseOptions("gc:whatever"));
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}
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