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LibJS+LibJIT: Make Assembler::native_call accept preserved_registers

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This makes JS::JIT::Compiler less architecture-specific
and unifies aligning the stack into a single operation,
where previously we were doing it separately for preserved registers
and for stack arguments.
This commit is contained in:
Nikodem Rabuliński 2023-10-29 13:39:19 +01:00 • committed by Andreas Kling
parent ecbb1df01b
commit 9f5450527f
2 changed files with 15 additions and 18 deletions
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19
Userland/Libraries/LibJIT/Assembler.h
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@ -732,11 +732,17 @@ struct Assembler {
}
}
// NOTE: It's up to the caller of this function to preserve registers as needed.
void native_call(void* callee, Vector<Operand> const& stack_arguments = {})
void native_call(
void* callee,
Vector<Operand> const& preserved_registers = {},
Vector<Operand> const& stack_arguments = {})
{
for (auto const& reg : preserved_registers.in_reverse())
push(reg);
// Preserve 16-byte stack alignment for non-even amount of stack-passed arguments
if ((stack_arguments.size() % 2) == 1)
auto needs_aligning = ((stack_arguments.size() + preserved_registers.size()) % 2) == 1;
if (needs_aligning)
push(Operand::Imm(0));
for (auto const& stack_argument : stack_arguments.in_reverse())
push(stack_argument);
@ -748,8 +754,11 @@ struct Assembler {
emit8(0xff);
emit_modrm_slash(2, Operand::Register(Reg::RAX));
if (!stack_arguments.is_empty())
add(Operand::Register(Reg::RSP), Operand::Imm(align_up_to(stack_arguments.size(), 2) * sizeof(void*)));
if (!stack_arguments.is_empty() || needs_aligning)
add(Operand::Register(Reg::RSP), Operand::Imm((stack_arguments.size() + (needs_aligning ? 1 : 0)) * sizeof(void*)));
for (auto const& reg : preserved_registers)
pop(reg);
}
void trap()