48 lines
1.9 KiB
C
48 lines
1.9 KiB
C
// dvxMem.h -- Per-app memory tracking for DVX
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//
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// REQUIRED: Every .c file compiled into a DXE (library, widget, shell,
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// or app) MUST include this header AFTER all system includes. This
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// ensures every malloc/free/calloc/realloc call goes through the
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// tracking wrappers, maintaining pointer consistency.
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//
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// The implementation (dvxPlatformDos.c) does NOT include this header,
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// so its dvxMalloc/dvxFree/dvxCalloc/dvxRealloc call the real libc
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// functions with no recursion.
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//
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// How it works:
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// 1. dvxMalloc prepends a 16-byte header (magic, appId, size) to
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// each allocation and returns a pointer past the header.
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// 2. dvxFree checks the magic value at ptr-16. If it matches, the
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// header is valid and the allocation is tracked. If not, the
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// pointer came from code outside DVX (libc internals, loader)
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// and is passed through to the real free() unchanged.
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// 3. The appId in the header comes from *dvxMemAppIdPtr, which the
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// shell points at ctx->currentAppId.
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//
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// The magic check makes cross-boundary frees safe: if DXE code frees
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// a pointer allocated by libc (e.g. from strdup, stb_ds internals),
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// dvxFree detects the missing header and falls through to real free.
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#ifndef DVX_MEM_H
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#define DVX_MEM_H
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#include <stdlib.h>
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extern int32_t *dvxMemAppIdPtr;
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void *dvxMalloc(size_t size);
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void *dvxCalloc(size_t nmemb, size_t size);
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void *dvxRealloc(void *ptr, size_t size);
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void dvxFree(void *ptr);
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void dvxMemSnapshotLoad(int32_t appId);
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uint32_t dvxMemGetAppUsage(int32_t appId);
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void dvxMemResetApp(int32_t appId);
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// Redirect standard allocator calls to tracking wrappers.
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// This MUST appear after <stdlib.h> so the real prototypes exist.
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#define malloc(s) dvxMalloc(s)
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#define calloc(n, s) dvxCalloc((n), (s))
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#define realloc(p, s) dvxRealloc((p), (s))
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#define free(p) dvxFree(p)
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#endif // DVX_MEM_H
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