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Merge pull request #817 from rainers/gc_config
make GC configurable through environment variable
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| /** | ||
| * Contains the garbage collector configuration. | ||
| * | ||
| * Copyright: Copyright Digital Mars 2014 | ||
| * License: <a href="http://www.boost.org/LICENSE_1_0.txt">Boost License 1.0</a>. | ||
| */ | ||
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| module gc.config; | ||
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| // to add the possiblity to configure the GC from the outside, add gc.config | ||
| // with one of these versions to the executable build command line, e.g. | ||
| // dmd -version=initGCFromEnvironment main.c /path/to/druntime/src/gc/config.d | ||
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| //version = initGCFromEnvironment; // read settings from environment variable D_GC | ||
| version = initGCFromCommandLine; // read settings from command line argument "--DRT-gcopt=options" | ||
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| version(initGCFromEnvironment) | ||
| version = configurable; | ||
| version(initGCFromCommandLine) | ||
| version = configurable; | ||
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| import core.stdc.stdlib; | ||
| import core.stdc.stdio; | ||
| import core.stdc.ctype; | ||
| import core.stdc.string; | ||
| import core.vararg; | ||
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| extern extern(C) string[] rt_args(); | ||
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| struct Config | ||
| { | ||
| bool disable; // start disabled | ||
| bool profile; // enable profiling with summary when terminating program | ||
| bool precise; // enable precise scanning | ||
| bool concurrent; // enable concurrent collection | ||
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| size_t initReserve; // initial reserve (MB) | ||
| size_t minPoolSize = 1; // initial and minimum pool size (MB) | ||
| size_t maxPoolSize = 32; // maximum pool size (MB) | ||
| size_t incPoolSize = 3; // pool size increment (MB) | ||
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| bool initialize(...) // avoid inlining | ||
| { | ||
| version(initGCFromEnvironment) | ||
| { | ||
| auto p = getenv("D_GC"); | ||
| if (p) | ||
| if (!parseOptions(p[0 .. strlen(p)])) | ||
| return false; | ||
| } | ||
| version(initGCFromCommandLine) | ||
| { | ||
| foreach (a; rt_args) | ||
| { | ||
| if(a.length >= 12 && a[0..12] == "--DRT-gcopt=") | ||
| if (!parseOptions(a[12 .. $])) | ||
| return false; | ||
| } | ||
| } | ||
| return true; | ||
| } | ||
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| version (configurable): | ||
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| string help() @nogc | ||
| { | ||
| return "GC options are specified as white space separated assignments: | ||
| disable=0|1 - start disabled | ||
| profile=0|1 - enable profiling with summary when terminating program | ||
| precise=0|1 - enable precise scanning (not implemented yet) | ||
| concurrent=0|1 - enable concurrent collection (not implemented yet) | ||
| initReserve=N - initial memory to reserve (MB), default 0 | ||
| minPoolSize=N - initial and minimum pool size (MB), default 1 | ||
| maxPoolSize=N - maximum pool size (MB), default 32 | ||
| incPoolSize=N - pool size increment (MB), defaut 3 | ||
| "; | ||
| } | ||
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| bool parseOptions(const(char)[] opt) @nogc | ||
| { | ||
| size_t p = 0; | ||
| while(p < opt.length) | ||
| { | ||
| while (p < opt.length && isspace(opt[p])) | ||
| p++; | ||
| if (p >= opt.length) | ||
| break; | ||
| auto q = p; | ||
| while (q < opt.length && opt[q] != '=' && !isspace(opt[q])) | ||
| q++; | ||
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| auto s = opt[p .. q]; | ||
| if(s == "help") | ||
| { | ||
| printf("%s", help().ptr); | ||
| p = q; | ||
| } | ||
| else if (q < opt.length) | ||
| { | ||
| auto r = q + 1; | ||
| size_t v = 0; | ||
| for ( ; r < opt.length && isdigit(opt[r]); r++) | ||
| v = v * 10 + opt[r] - '0'; | ||
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| if(s == "disable") | ||
| disable = v != 0; | ||
| else if(s == "profile") | ||
| profile = v != 0; | ||
| else if(s == "precise") | ||
| precise = v != 0; | ||
| else if(s == "concurrent") | ||
| concurrent = v != 0; | ||
| else if(s == "initReserve") | ||
| initReserve = v; | ||
| else if(s == "minPoolSize") | ||
| minPoolSize = v; | ||
| else if(s == "maxPoolSize") | ||
| maxPoolSize = v; | ||
| else if(s == "incPoolSize") | ||
| incPoolSize = v; | ||
| else | ||
| { | ||
| printf("Unknown GC option \"%.*s\"\n", cast(int) s.length, s.ptr); | ||
| return false; | ||
| } | ||
| p = r; | ||
| } | ||
| else | ||
| { | ||
| printf("Incomplete GC option \"%.*s\"\n", cast(int) s.length, s.ptr); | ||
| return false; | ||
| } | ||
| } | ||
| return true; | ||
| } | ||
| } |
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