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py/gc: Reduce code size when MICROPY_GC_SPLIT_HEAP is disabled.

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Use C macros to reduce the size of firmware images when the GC split-heap
feature is disabled.

The code size difference of this commit versus HEAD~2 (ie the commit prior
to MICROPY_GC_SPLIT_HEAP being introduced) when split-heap is disabled is:

       bare-arm:    +0 +0.000%
    minimal x86:    +0 +0.000%
       unix x64:   -16 -0.003%
    unix nanbox:   -20 -0.004%
          stm32:    -8 -0.002% PYBV10
         cc3200:    +0 +0.000%
        esp8266:    +8 +0.001% GENERIC
          esp32:    +0 +0.000% GENERIC
            nrf:   -20 -0.011% pca10040
            rp2:    +0 +0.000% PICO
           samd:    -4 -0.003% ADAFRUIT_ITSYBITSY_M4_EXPRESS

The code size difference of this commit versus HEAD~2 split-heap is enabled
with MICROPY_GC_MULTIHEAP=1 (but no extra code to add more heaps):

    unix x64: +1032 +0.197% [incl +544(bss)]
       esp32:  +592 +0.039% GENERIC[incl +16(data) +264(bss)]
This commit is contained in:
Rob Knegjens
2022-04-12 21:26:16 -07:00
committed by Damien George
parent bcc827d695
commit 4a48531803
2 changed files with 90 additions and 44 deletions
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15
py/mpstate.h
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@@ -89,15 +89,6 @@ typedef struct _mp_state_mem_area_t {
size_t gc_last_free_atb_index;
} mp_state_mem_area_t;
// This structure holds a single stacked block and the area it is on. Used
// during garbage collection.
typedef struct {
#if MICROPY_GC_SPLIT_HEAP
mp_state_mem_area_t *area;
#endif
size_t block;
} mp_gc_stack_item_t;
// This structure hold information about the memory allocation system.
typedef struct _mp_state_mem_t {
#if MICROPY_MEM_STATS
@@ -109,7 +100,11 @@ typedef struct _mp_state_mem_t {
mp_state_mem_area_t area;
int gc_stack_overflow;
mp_gc_stack_item_t gc_stack[MICROPY_ALLOC_GC_STACK_SIZE];
MICROPY_GC_STACK_ENTRY_TYPE gc_block_stack[MICROPY_ALLOC_GC_STACK_SIZE];
#if MICROPY_GC_SPLIT_HEAP
// Array that tracks the area for each block on gc_block_stack.
mp_state_mem_area_t *gc_area_stack[MICROPY_ALLOC_GC_STACK_SIZE];
#endif
// This variable controls auto garbage collection. If set to 0 then the
// GC won't automatically run when gc_alloc can't find enough blocks. But