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xo-gc stack: + gc-location-of() primitive

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This commit is contained in:
Roland Conybeare 2026-03-29 19:47:15 -04:00
commit 909c1e485a
5 changed files with 28 additions and 1 deletions
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18
idl/Collector.json5
View file

@ -50,7 +50,7 @@
noexcept: true,
attributes: [],
},
// size_type reserved(Generation g, role r) const noexcept
// size_type committed(Generation g, role r) const noexcept
{
name: "committed",
doc: ["memory committed for this collector"],
@ -76,6 +76,22 @@
noexcept: true,
attributes: [],
},
// int32_t locate() const noexcept
{
name: "locate_address",
doc: [
"Location of object in collector. -1 if not in collector memory.",
"Other negative values represent collector error states (good luck!).",
"Exact meaning of non-negative values up to collector implementation"
],
return_type: "std::int32_t",
args: [
{type: "const void *", name: "addr"},
],
const: true,
noexcept: true,
attributes: [],
},
// bool contains(role r, const void * addr) const noexcept
{
name: "contains",

4
include/xo/alloc2/gc/ACollector.hpp
View file

@ -65,6 +65,10 @@ public:
virtual size_type committed(Copaque data, Generation g, role r) const noexcept = 0;
/** address space reserved for this collector **/
virtual size_type reserved(Copaque data, Generation g, role r) const noexcept = 0;
/** Location of object in collector. -1 if not in collector memory.
Other negative values represent collector error states (good luck!).
Exact meaning of non-negative values up to collector implementation **/
virtual std::int32_t locate_address(Copaque data, const void * addr) const noexcept = 0;
/** true if gc responsible for data at @p addr, and data belongs to role @p r **/
virtual bool contains(Copaque data, role r, const void * addr) const noexcept = 0;
/** true iff gc-aware object of type @p tseq is installed in this collector **/

1
include/xo/alloc2/gc/ICollector_Any.hpp
View file

@ -62,6 +62,7 @@ namespace mm {
[[noreturn]] size_type allocated(Copaque, Generation, role) const noexcept override { _fatal(); }
[[noreturn]] size_type committed(Copaque, Generation, role) const noexcept override { _fatal(); }
[[noreturn]] size_type reserved(Copaque, Generation, role) const noexcept override { _fatal(); }
[[noreturn]] std::int32_t locate_address(Copaque, const void *) const noexcept override { _fatal(); }
[[noreturn]] bool contains(Copaque, role, const void *) const noexcept override { _fatal(); }
[[noreturn]] bool is_type_installed(Copaque, typeseq) const noexcept override { _fatal(); }
[[noreturn]] bool report_statistics(Copaque, obj<AAllocator>, obj<AAllocator>, obj<AGCObject> *) const noexcept override { _fatal(); }

3
include/xo/alloc2/gc/ICollector_Xfer.hpp
View file

@ -55,6 +55,9 @@ namespace mm {
size_type reserved(Copaque data, Generation g, role r) const noexcept override {
return I::reserved(_dcast(data), g, r);
}
std::int32_t locate_address(Copaque data, const void * addr) const noexcept override {
return I::locate_address(_dcast(data), addr);
}
bool contains(Copaque data, role r, const void * addr) const noexcept override {
return I::contains(_dcast(data), r, addr);
}

3
include/xo/alloc2/gc/RCollector.hpp
View file

@ -88,6 +88,9 @@ public:
size_type reserved(Generation g, role r) const noexcept {
return O::iface()->reserved(O::data(), g, r);
}
std::int32_t locate_address(const void * addr) const noexcept {
return O::iface()->locate_address(O::data(), addr);
}
bool contains(role r, const void * addr) const noexcept {
return O::iface()->contains(O::data(), r, addr);
}