Add parallel copying collector

Makefile

@@ -2,6 +2,7 @@ TESTS = quads mt-gcbench ephemerons # MT_GCBench MT_GCBench2
 COLLECTORS = \
 	bdw \
 	semi \
+	pcc \
 	\
 	whippet \
 	stack-conservative-whippet \
@@ -60,6 +61,9 @@ GC_LIBS_bdw        = `pkg-config --libs bdw-gc`
 GC_STEM_semi       = semi
 GC_CFLAGS_semi     = -DGC_PRECISE_ROOTS=1
 
+GC_STEM_pcc       = pcc
+GC_CFLAGS_pcc     = -DGC_PRECISE_ROOTS=1 -DGC_PARALLEL=1
+
 define whippet_variant
 GC_STEM_$(1)       = whippet
 GC_CFLAGS_$(1)     = $(2)

api/pcc-attrs.h

@@ -0,0 +1,60 @@
+#ifndef PCC_ATTRS_H
+#define PCC_ATTRS_H
+
+#include "gc-config.h"
+#include "gc-assert.h"
+#include "gc-attrs.h"
+
+static const uintptr_t GC_ALIGNMENT = 8;
+static const size_t GC_LARGE_OBJECT_THRESHOLD = 8192;
+
+static inline enum gc_allocator_kind gc_allocator_kind(void) {
+  return GC_ALLOCATOR_INLINE_BUMP_POINTER;
+}
+static inline size_t gc_allocator_small_granule_size(void) {
+  return GC_ALIGNMENT;
+}
+static inline size_t gc_allocator_large_threshold(void) {
+  return GC_LARGE_OBJECT_THRESHOLD;
+}
+
+static inline size_t gc_allocator_allocation_pointer_offset(void) {
+  return sizeof(uintptr_t) * 0;
+}
+static inline size_t gc_allocator_allocation_limit_offset(void) {
+  return sizeof(uintptr_t) * 1;
+}
+
+static inline size_t gc_allocator_freelist_offset(size_t size) {
+  GC_CRASH();
+}
+
+static inline size_t gc_allocator_alloc_table_alignment(void) {
+  return 0;
+}
+static inline uint8_t gc_allocator_alloc_table_begin_pattern(void) {
+  GC_CRASH();
+}
+static inline uint8_t gc_allocator_alloc_table_end_pattern(void) {
+  GC_CRASH();
+}
+
+static inline int gc_allocator_needs_clear(void) {
+  return 1;
+}
+
+static inline enum gc_write_barrier_kind gc_write_barrier_kind(size_t obj_size) {
+  return GC_WRITE_BARRIER_NONE;
+}
+static inline size_t gc_write_barrier_card_table_alignment(void) {
+  GC_CRASH();
+}
+static inline size_t gc_write_barrier_card_size(void) {
+  GC_CRASH();
+}
+
+static inline enum gc_safepoint_mechanism gc_safepoint_mechanism(void) {
+  return GC_SAFEPOINT_MECHANISM_COOPERATIVE;
+}
+
+#endif // PCC_ATTRS_H

embed.mk

@@ -40,6 +40,9 @@ GC_LIBS_bdw        = `pkg-config --libs bdw-gc`
 GC_STEM_semi       = semi
 GC_CFLAGS_semi     = -DGC_PRECISE_ROOTS=1
 
+GC_STEM_pcc        = pcc
+GC_CFLAGS_pcc      = -DGC_PRECISE_ROOTS=1 -DGC_PARALLEL=1
+
 define whippet_variant
 GC_STEM_$(1)       = whippet
 GC_CFLAGS_$(1)     = $(2)

src/large-object-space.h

@@ -58,6 +58,11 @@ static size_t large_object_space_npages(struct large_object_space *space,
   return (bytes + space->page_size - 1) >> space->page_size_log2;
 }
 
+static size_t
+large_object_space_size_at_last_collection(struct large_object_space *space) {
+  return space->live_pages_at_last_collection << space->page_size_log2;
+}
+
 static void large_object_space_clear_one_remembered(uintptr_t addr,
                                                     void *unused) {
   struct gc_ref ref = gc_ref(addr);