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gapstate.h: account for a large jmp_buf #6373

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gapstate.h: account for a large jmp_buf #6373

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6 changes: 5 additions & 1 deletion src/gapstate.h
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,11 @@
#include <setjmp.h>

enum {
STATE_SLOTS_SIZE = 32768 - 1024,
// On some platforms (e.g., powerpc64), sizeof(jmp_buf) is much larger
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@fingolfin fingolfin May 7, 2026

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Is this Linux on powerpc64 or what?

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@pkubaj pkubaj May 8, 2026

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It's FreeBSD on powerpc64 / powerpc64le.

// than ~200 bytes on x86_64/aarch64. Subtract the excess so that
// GAPState stays within the 32767-byte 16-bit signed offset limit.
GAP_JMP_BUF_EXTRA = (int)sizeof(jmp_buf) > 200 ? (int)sizeof(jmp_buf) - 200 : 0,
STATE_SLOTS_SIZE = 32768 - 1024 - GAP_JMP_BUF_EXTRA,
};

typedef struct GAPState {
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