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I wanted a tiny scriptable meltdown proof way to run userspace programs and visualize how program execution impacts memory. It helps to explain how things like Actually Portable Executable works. It can show you how the GCC generated code is going about manipulating matrices and more. I didn't feel fully comfortable with Qemu and Bochs because I'm not smart enough to understand them. I wanted something like gVisor but with much stronger levels of assurances. I wanted a single binary that'll run, on all major operating systems with an embedded GPL barrier ZIP filesystem that is tiny enough to transpile to JavaScript and run in browsers too. https://justine.storage.googleapis.com/emulator625.mp4
38 lines
1.9 KiB
C
38 lines
1.9 KiB
C
#ifndef COSMOPOLITAN_LIBC_ALG_ARRAYLIST2_H_
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#define COSMOPOLITAN_LIBC_ALG_ARRAYLIST2_H_
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#include "libc/mem/mem.h"
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#include "libc/str/str.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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/* TODO(jart): Fully develop these better macros. */
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#define APPEND(LIST_P, LIST_I, LIST_N, ITEM) \
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CONCAT(LIST_P, LIST_I, LIST_N, ITEM, 1)
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#define CONCAT(LIST_P, LIST_I, LIST_N, ITEM, COUNT) \
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({ \
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autotype(LIST_P) ListP = (LIST_P); \
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autotype(LIST_I) ListI = (LIST_I); \
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autotype(LIST_N) ListN = (LIST_N); \
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typeof(&(*ListP)[0]) Item = (ITEM); \
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size_t SizE = sizeof(*Item); \
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size_t Count = (COUNT); \
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ssize_t Entry = -1; \
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/* NOTE: We use `<` to guarantee one additional slot */ \
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/* grow() will memset(0) extended memory, thus */ \
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/* you get a nul-terminator for free sometimes */ \
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/* the exception is if you list.i=0 and re-use */ \
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/* so you need concat(...); list.p[list.i++]=0 */ \
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if (*ListI + Count < *ListN || grow(ListP, ListN, SizE, Count)) { \
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memcpy(&(*ListP)[*ListI], Item, (SizE) * (Count)); \
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Entry = *ListI; \
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*ListI += Count; /* happens after copy in case signal */ \
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} \
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Entry; \
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})
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_ALG_ARRAYLIST2_H_ */
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