user
73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
#include "heap4_model.h"
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enum {
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ARENA_BYTES = 256,
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REQUEST_BYTES = 13,
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WANTED_BYTES = (sizeof(ModelBlock) + REQUEST_BYTES + 7U) & ~7U
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};
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typedef struct {
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ModelBlock allocated;
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uint8_t payload[WANTED_BYTES - sizeof(ModelBlock)];
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ModelBlock remainder;
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uint8_t free_payload[ARENA_BYTES - WANTED_BYTES - sizeof(ModelBlock)];
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} SplitArena;
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typedef union {
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uint64_t force_alignment;
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SplitArena blocks;
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} AlignedSplitArena;
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AlignedSplitArena g_split_arena;
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ModelBlock *g_free_head;
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volatile size_t g_header_bytes;
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volatile size_t g_wanted_bytes;
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volatile size_t g_remainder_bytes;
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volatile size_t g_payload_offset;
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volatile int g_split_addresses_aligned;
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volatile int g_task01_pass;
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__attribute__((noinline)) void task01_debug_checkpoint(void)
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{
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#if defined(__GNUC__)
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__asm__ volatile("" ::: "memory");
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#endif
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}
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int main(void)
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{
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SplitArena *arena = &g_split_arena.blocks;
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uintptr_t base = (uintptr_t)&arena->allocated;
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uintptr_t remainder = (uintptr_t)&arena->remainder;
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arena->allocated.next = NULL;
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arena->allocated.size = WANTED_BYTES;
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arena->remainder.next = NULL;
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arena->remainder.size = ARENA_BYTES - WANTED_BYTES;
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arena->payload[0] = (uint8_t)'A';
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g_free_head = &arena->remainder;
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g_header_bytes = sizeof(ModelBlock);
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g_wanted_bytes = WANTED_BYTES;
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g_remainder_bytes = arena->remainder.size;
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g_payload_offset = (size_t)((uintptr_t)&arena->payload[0] - base);
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g_split_addresses_aligned =
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(base % MODEL_ALIGNMENT) == 0U &&
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(remainder % MODEL_ALIGNMENT) == 0U;
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g_task01_pass =
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g_wanted_bytes == model_align_up(sizeof(ModelBlock) + REQUEST_BYTES) &&
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(size_t)(remainder - base) == g_wanted_bytes &&
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g_remainder_bytes + g_wanted_bytes == ARENA_BYTES &&
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g_payload_offset == sizeof(ModelBlock) &&
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g_split_addresses_aligned;
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task01_debug_checkpoint();
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#if defined(HOST_PRINTF)
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printf("header=%zu wanted=%zu remainder=%zu payload=%zu aligned=%d pass=%d\n",
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g_header_bytes, g_wanted_bytes, g_remainder_bytes,
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g_payload_offset, g_split_addresses_aligned, g_task01_pass);
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#endif
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return g_task01_pass ? 0 : 1;
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}
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