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Do not allow parameters in naked functions.

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This commit is contained in:
Christoffer Lerno
2025-07-30 01:01:56 +02:00
parent 8151305701
commit 44f4efa5aa
6 changed files with 55 additions and 28 deletions
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19
test/test_suite/asm/naked_call_with_instructions.c3t
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@@ -1,28 +1,37 @@
// #target: macos-x64
module test;
import std;
fn void main()
{
char[8] foo = {255, 0, 0, 0, 0, 0, 0, 0};
io::printn(to_ulong(&foo));
ulong a = to_ulong2(&foo);
ulong b = to_ulong(&foo);
}
fn ulong to_ulong(char[8]* buf) @naked @noinline
fn ulong to_ulong(char[8]*) @naked @noinline
{
asm
{
movq $rax, [buf];
movq [$rsp - 8], $rdi;
movq $rax, [$rsp - 8];
movq $rax, [$rax];
ret;
}
unreachable();
}
fn ulong to_ulong2(char[8]* buf)
{
return *(ulong*)buf;
}
/* #expect: test.ll
define i64 @test.to_ulong(ptr %0) #1 {
entry:
call void asm sideeffect alignstack "movq ($0), %rax\0Aret \0A", "r,~{rax},~{flags},~{dirflag},~{fspr}"(ptr %0)
call void asm sideeffect alignstack "movq %rdi, -8(%rsp)\0Amovq -8(%rsp), %rax\0Amovq (%rax), %rax\0Aret \0A", "~{rax},~{flags},~{dirflag},~{fspr}"()
unreachable
}
attributes #1 = { naked noinline nounwind uwtable "no-trapping-math"="true" "stack-protector-buffer-size"="8" }

6
test/test_suite/asm/naked_rethrow.c3
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@@ -10,4 +10,10 @@ fn ulong? test() @naked @noinline
int? z;
z!; // #error: Rethrow is not allowed in a '@naked' function
unreachable();
}
fn ulong test2(int a) @naked @noinline
{
int x = a; // #error: Parameters may not be directly accessed in '@naked' functions
unreachable();
}