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druntime: opt-in thread-local GC (tgc) #23514

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517de9c
Add opt-in thread-local GC backend (tgc)
AMDphreak Aug 2, 2026
cc42554
Reframe tgc as 0.1.0 and add shared-region API scaffold.
AMDphreak Sep 1, 2026
cad2288
Bump tgc prototype to 0.1.1 for region API scaffold.
AMDphreak Sep 1, 2026
170dc9b
Fix tgc module header comment for 0.1.1
AMDphreak Sep 1, 2026
5221cbd
Implement tgc 0.2.0: region collect, tests, and benchmarks.
AMDphreak Sep 1, 2026
c87a9c6
Fix tgc 0.2.0 runtime bugs found during local Windows build.
AMDphreak Sep 1, 2026
9465a68
Fix tgc druntime tests for release builds on Windows.
AMDphreak Sep 1, 2026
63a13ca
Improve tgc 0.2.1: O(log n) findBlock, smaller header, bounded fixpoint.
AMDphreak Sep 4, 2026
0389d06
Improve tgc 0.2.2 lookup and collector correctness.
AMDphreak Sep 7, 2026
67d2e1b
Harden tgc 0.2.3 after concurrency audit.
AMDphreak Sep 7, 2026
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15 changes: 15 additions & 0 deletions changelog/druntime.tgc.dd
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@@ -0,0 +1,15 @@
Opt-in thread-local GC (`tgc`, 0.2.0 prototype)

Select with `--DRT-gcopt=gc:tgc`.

**0.2.0:** working partitioned shared regions with region-scoped collection
(selective thread suspend via `thread_suspendList`), per-heap list locks,
basic array append metadata, and benchmark/test harness.

Region API: `_d_tgc_region_create`, `_d_tgc_region_attach`, `_d_tgc_region_malloc`,
`_d_tgc_region_collect`, `_d_tgc_version`.

Optional: `--DRT-gcopt=gc:tgc tgcShared:symgc` (SymGC shared backend stub for 0.3.0).

Tests: `druntime/test/gc/tgc.d`, `tgc_regions.d`, `tgc_bench.d`.
Benchmarks: `tools/tgc-bench/run-benchmarks.ps1`.
3 changes: 3 additions & 0 deletions druntime/Makefile
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Expand Up @@ -203,6 +203,9 @@ $(DOC_OUTPUT_DIR)/core_internal_gc_impl_conservative_%.html : import/core/intern
$(DOC_OUTPUT_DIR)/core_internal_gc_impl_manual_%.html : import/core/internal/gc/impl/manual/%.d $(DMD)
$(DMD) $(DDOCFLAGS) -Df$@ project.ddoc $(DOCFMT) $<

$(DOC_OUTPUT_DIR)/core_internal_gc_impl_tgc_%.html : import/core/internal/gc/impl/tgc/%.d $(DMD)
$(DMD) $(DDOCFLAGS) -Df$@ project.ddoc $(DOCFMT) $<

$(DOC_OUTPUT_DIR)/core_internal_gc_impl_proto_%.html : import/core/internal/gc/impl/proto/%.d $(DMD)
$(DMD) $(DDOCFLAGS) -Df$@ project.ddoc $(DOCFMT) $<

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1 change: 1 addition & 0 deletions druntime/mak/COPY
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Expand Up @@ -79,6 +79,7 @@ COPY=\
$(IMPDIR)\core\internal\gc\proxy.d \
$(IMPDIR)\core\internal\gc\impl\conservative\gc.d \
$(IMPDIR)\core\internal\gc\impl\manual\gc.d \
$(IMPDIR)\core\internal\gc\impl\tgc\gc.d \
$(IMPDIR)\core\internal\gc\impl\proto\gc.d \
\
$(IMPDIR)\core\internal\container\array.d \
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1 change: 1 addition & 0 deletions druntime/mak/DOCS
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Expand Up @@ -551,6 +551,7 @@ DOCS=\
$(DOCDIR)\core_internal_gc_proxy.html \
$(DOCDIR)\core_internal_gc_impl_conservative_gc.html \
$(DOCDIR)\core_internal_gc_impl_manual_gc.html \
$(DOCDIR)\core_internal_gc_impl_tgc_gc.html \
$(DOCDIR)\core_internal_gc_impl_proto_gc.html \
\
$(DOCDIR)\rt_aApply.html \
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1 change: 1 addition & 0 deletions druntime/mak/SRCS
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Expand Up @@ -82,6 +82,7 @@ SRCS=\
src\core\internal\gc\proxy.d \
src\core\internal\gc\impl\conservative\gc.d \
src\core\internal\gc\impl\manual\gc.d \
src\core\internal\gc\impl\tgc\gc.d \
src\core\internal\gc\impl\proto\gc.d \
\
src\core\internal\util\array.d \
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1 change: 1 addition & 0 deletions druntime/src/core/gc/config.d
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Expand Up @@ -20,6 +20,7 @@ struct Config
bool fork = false; // optional concurrent behaviour
ubyte profile; // enable profiling with summary when terminating program
string gc = "conservative"; // select gc implementation conservative|precise|manual
string tgcShared = "native"; // tgc shared-region backend: native|symgc (symgc: 0.3.0 stub)

@MemVal size_t initReserve; // initial reserve (bytes)
@MemVal size_t minPoolSize = 1 << 20; // initial and minimum pool size (bytes)
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