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The tree's 3DS layer (the custom crt0 and link spec, system and memory setup, svchax, the old GPU command layer and the 3dsx/CIA launchers) lives under os/ctr, beside os/gekko and os/wiiu. The linear heap allocator is C: the same first-fit pool, so buffers land where they did, with live allocations found by address in an open-addressing table instead of a per-allocation tree node, and list nodes taken from cache-line-aligned slabs and reused. On the same trace it runs about half the instructions and practically no malloc/free calls. With the whole heap allocated, a further allocation now fails instead of starting the heap over and handing out its first address again, and the free-space queries no longer fault. samples/frontend/ctr_linear checks placement, alignment, coalescing, the full-heap case and pages handed back from the heap's end.
29 lines
796 B
Makefile
29 lines
796 B
Makefile
# os/ctr/ctr_linear.c, the 3DS linear heap allocator, against a stand-in
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# <3ds.h> and a linear heap at an address it hands out but never
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# touches. Builds for Linux and, with CC=x86_64-w64-mingw32-gcc EXE=.exe
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# RUNNER=wine, for Windows.
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TARGET := ctr_linear_test$(EXE)
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CORE_DIR := ../../..
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SOURCES := ctr_linear_test.c $(CORE_DIR)/os/ctr/ctr_linear.c
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CFLAGS += -std=c89 -Wall -g1 -O1 -I. -I$(CORE_DIR)/libretro-common/include
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ifneq ($(SANITIZER),)
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CFLAGS := -fsanitize=$(SANITIZER) -fno-omit-frame-pointer $(CFLAGS)
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LDFLAGS := -fsanitize=$(SANITIZER) $(LDFLAGS)
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endif
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all: $(TARGET)
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$(TARGET): $(SOURCES) 3ds.h 3ds/types.h
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$(CC) $(CFLAGS) -o $@ $(SOURCES) $(LDFLAGS)
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check: all
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$(RUNNER) ./$(TARGET)
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clean:
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rm -f ctr_linear_test ctr_linear_test.exe
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.PHONY: all check clean
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