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import "compiler/ast.cup"
import "std/vector.cup"
let all_builtins = vector_new();
fn builtin_create_syscall(name: char*, num_args: int) {
let node = node_new(AST_BUILTIN);
node.etyp = type_new(TYPE_ANY);
node.d.func.name = name;
node.d.func.args = vector_new_sized(num_args+1); // +1 for syscall number
vector_push(node.d.func.args, variable_new("val", type_new(TYPE_INT), 0));
for (let i = 0; i < num_args; i = i + 1) {
vector_push(node.d.func.args, variable_new("arg", type_new(TYPE_ANY), 0));
}
vector_push(all_builtins, node);
}
// Defined in `parser.cup`
fn constant_push(name: char*, val: int);
fn builtins_push_posix_constants() {
constant_push("SYS_read", SYS_read);
constant_push("SYS_write", SYS_write);
constant_push("SYS_exit", SYS_exit);
constant_push("SYS_open", SYS_open);
constant_push("SYS_lseek", SYS_lseek);
constant_push("SYS_openat", SYS_openat);
constant_push("SYS_close", SYS_close);
constant_push("SYS_fork", SYS_fork);
constant_push("SYS_wait4", SYS_wait4);
constant_push("SYS_mmap", SYS_mmap);
constant_push("SEEK_SET", SEEK_SET);
constant_push("SEEK_CUR", SEEK_CUR);
constant_push("SEEK_END", SEEK_END);
constant_push("O_RDONLY", O_RDONLY);
constant_push("O_WRONLY", O_WRONLY);
constant_push("O_RDWR", O_RDWR);
constant_push("O_CREAT", O_CREAT);
constant_push("O_EXCL", O_EXCL);
constant_push("O_TRUNC", O_TRUNC);
constant_push("AT_FDCWD", AT_FDCWD);
constant_push("PROT_READ", PROT_READ);
constant_push("PROT_WRITE", PROT_WRITE);
constant_push("PROT_EXEC", PROT_EXEC);
constant_push("PROT_NONE", PROT_NONE);
constant_push("MAP_SHARED", MAP_SHARED);
constant_push("MAP_PRIVATE", MAP_PRIVATE);
constant_push("MAP_ANONYMOUS", MAP_ANONYMOUS);
constant_push("MAP_FIXED", MAP_FIXED);
constant_push("MAP_FAILED", MAP_FAILED);
}
fn initialize_builtins() {
let node: Node*;
let var: Variable*;
builtins_push_posix_constants();
constant_push("OS_IS_MACOS", OS_IS_MACOS);
constant_push("OS_IS_LINUX", OS_IS_LINUX);
// This is very annoying to do by hand.
node = node_new(AST_BUILTIN);
node.etyp = type_new(TYPE_VOID);
node.d.func.name = "print";
node.d.func.args = vector_new_sized(1);
vector_push(node.d.func.args, variable_new("val", type_new(TYPE_ANY), 0));
vector_push(all_builtins, node);
builtin_create_syscall("syscall0", 0);
builtin_create_syscall("syscall1", 1);
builtin_create_syscall("syscall2", 2);
builtin_create_syscall("syscall3", 3);
builtin_create_syscall("syscall4", 4);
builtin_create_syscall("syscall5", 5);
builtin_create_syscall("syscall6", 6);
builtin_create_syscall("syscall7", 7);
}
fn find_builtin_function(token: Token*): Node* {
for (let i = 0; i < all_builtins.size; i = i + 1) {
let node: Node* = all_builtins.data[i];
if (streq(node.d.func.name, token.value.as_string)) {
return node;
}
}
return null;
}
// Defined in "compiler/codegen.c"
fn emit_asm(msg: char*);
fn emit_num(val: int);
fn generate_syscall(num: int);
fn generate_builtins() {
emit_asm("func_print:\n");
emit_asm(" mov rdi, [rsp+8]\n");
emit_asm(" mov r9, -3689348814741910323\n");
emit_asm(" sub rsp, 40\n");
emit_asm(" mov byte [rsp+31], 10\n");
emit_asm(" lea rcx, [rsp+30]\n");
emit_asm(" mov qword rbx, 0\n");
emit_asm(".L2:\n");
emit_asm(" mov rax, rdi\n");
emit_asm(" lea r8, [rsp+32]\n");
emit_asm(" mul r9\n");
emit_asm(" mov rax, rdi\n");
emit_asm(" sub r8, rcx\n");
emit_asm(" shr rdx, 3\n");
emit_asm(" lea rsi, [rdx+rdx*4]\n");
emit_asm(" add rsi, rsi\n");
emit_asm(" sub rax, rsi\n");
emit_asm(" add eax, 48\n");
emit_asm(" mov byte [rcx], al\n");
emit_asm(" mov rax, rdi\n");
emit_asm(" mov rdi, rdx\n");
emit_asm(" mov rdx, rcx\n");
emit_asm(" sub rcx, 1\n");
emit_asm(" cmp rax, 9\n");
emit_asm(" ja .L2\n");
emit_asm(" lea rax, [rsp+32]\n");
emit_asm(" mov edi, 1\n");
emit_asm(" sub rdx, rax\n");
emit_asm(" xor eax, eax\n");
emit_asm(" lea rsi, [rsp+32+rdx]\n");
emit_asm(" mov rdx, r8\n");
generate_syscall(SYS_write);
emit_asm(" add rsp, 40\n");
emit_asm(" ret\n");
// Syscalls
let x86_64_sysc_regs: char*[10];
x86_64_sysc_regs[0] = "rax";
x86_64_sysc_regs[1] = "rdi";
x86_64_sysc_regs[2] = "rsi";
x86_64_sysc_regs[3] = "rdx";
x86_64_sysc_regs[4] = "rcx";
x86_64_sysc_regs[5] = "r8";
x86_64_sysc_regs[6] = "r9";
x86_64_sysc_regs[7] = "r10";
x86_64_sysc_regs[8] = "r11";
x86_64_sysc_regs[9] = "r12";
for (let sysc_args = 0; sysc_args < 7; ++sysc_args) {
emit_asm("func_syscall"); emit_num(sysc_args); emit_asm(":\n");
for (let i = 0; i < sysc_args+1; ++i) {
emit_asm(" mov "); emit_asm(x86_64_sysc_regs[i]);
emit_asm(", [rsp+"); emit_num((i+1)*8); emit_asm("]\n");
}
emit_asm(" syscall\n");
emit_asm(" ret\n");
}
}
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