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ruby/yjit_utils.c

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// This file is a fragment of the yjit.o compilation unit. See yjit.c.
// Save caller-save registers on the stack before a C call
static void
push_regs(codeblock_t *cb)
{
push(cb, RAX);
push(cb, RCX);
push(cb, RDX);
push(cb, RSI);
push(cb, RDI);
push(cb, R8);
push(cb, R9);
push(cb, R10);
push(cb, R11);
pushfq(cb);
}
// Restore caller-save registers from the after a C call
static void
pop_regs(codeblock_t *cb)
{
popfq(cb);
pop(cb, R11);
pop(cb, R10);
pop(cb, R9);
pop(cb, R8);
pop(cb, RDI);
pop(cb, RSI);
pop(cb, RDX);
pop(cb, RCX);
pop(cb, RAX);
}
static void
print_int_cfun(int64_t val)
{
fprintf(stderr, "%lld\n", (long long int)val);
}
RBIMPL_ATTR_MAYBE_UNUSED()
static void
print_int(codeblock_t *cb, x86opnd_t opnd)
{
push_regs(cb);
if (opnd.num_bits < 64 && opnd.type != OPND_IMM)
movsx(cb, RDI, opnd);
else
mov(cb, RDI, opnd);
// Call the print function
mov(cb, RAX, const_ptr_opnd((void*)&print_int_cfun));
call(cb, RAX);
pop_regs(cb);
}
static void
print_ptr_cfun(void *val)
{
fprintf(stderr, "%p\n", val);
}
RBIMPL_ATTR_MAYBE_UNUSED()
static void
print_ptr(codeblock_t *cb, x86opnd_t opnd)
{
assert (opnd.num_bits == 64);
push_regs(cb);
mov(cb, RDI, opnd);
mov(cb, RAX, const_ptr_opnd((void*)&print_ptr_cfun));
call(cb, RAX);
pop_regs(cb);
}
static void
print_str_cfun(const char *str)
{
fprintf(stderr, "%s\n", str);
}
// Print a constant string to stdout
static void
print_str(codeblock_t *cb, const char *str)
{
//as.comment("printStr(\"" ~ str ~ "\")");
size_t len = strlen(str);
push_regs(cb);
// Load the string address and jump over the string data
lea(cb, RDI, mem_opnd(8, RIP, 5));
jmp32(cb, (int32_t)len + 1);
// Write the string chars and a null terminator
for (size_t i = 0; i < len; ++i)
cb_write_byte(cb, (uint8_t)str[i]);
cb_write_byte(cb, 0);
// Call the print function
mov(cb, RAX, const_ptr_opnd((void*)&print_str_cfun));
call(cb, RAX);
pop_regs(cb);
}