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YJIT: Do not call mprotect when mem_size is zero (#6563)

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This allows x86_64 based YJIT to run on Docker Desktop on Apple silicon (arm64)
Mac because it will avoid a subtle behavior difference in `mprotect` system call
between the Linux kernel and `qemu-x86_64` user space emulator.
This commit is contained in:
Tatsuya Kawano 2022-10-18 00:26:36 +08:00 • committed by GitHub
parent ad3d210bea
commit 07a93b1e37
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Notes: git 2022-10-17 16:26:56 +00:00 
Merged-By: maximecb <maximecb@ruby-lang.org>
1 changed files with 5 additions and 0 deletions
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yjit.c
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@ -74,6 +74,11 @@ rb_yjit_mark_writable(void *mem_block, uint32_t mem_size)
void void
rb_yjit_mark_executable(void *mem_block, uint32_t mem_size) rb_yjit_mark_executable(void *mem_block, uint32_t mem_size)
{ {
// Do not call mprotect when mem_size is zero. Some platforms may return
// an error for it. https://github.com/Shopify/ruby/issues/450
if (mem_size == 0) {
return;
}
if (mprotect(mem_block, mem_size, PROT_READ | PROT_EXEC)) { if (mprotect(mem_block, mem_size, PROT_READ | PROT_EXEC)) {
rb_bug("Couldn't make JIT page (%p, %lu bytes) executable, errno: %s\n", rb_bug("Couldn't make JIT page (%p, %lu bytes) executable, errno: %s\n",
mem_block, (unsigned long)mem_size, strerror(errno)); mem_block, (unsigned long)mem_size, strerror(errno));