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#include "builtins.h"
#include "ast.h"
#include "utils.h"
#include "generator.h"
#include "parser.h"
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <assert.h>
#include <stdarg.h>
#include <sys/syscall.h>
#include <sys/mman.h>
#define MAX_CUSTOM_BUILTIN_COUNT 128
static Node *custom_builtins[MAX_CUSTOM_BUILTIN_COUNT];
static i64 custom_builtins_count = 0;
static void push_builtin(Node *node)
{
assert(custom_builtins_count < MAX_CUSTOM_BUILTIN_COUNT);
custom_builtins[custom_builtins_count++] = node;
}
static void push_syscall_builtin(char *name, int num_args) {
Node *node;
node = Node_new(AST_BUILTIN);
node->func.name = name;
node->func.return_type = type_new(TYPE_ANY);
node->func.num_args = num_args+1;
node->func.args = (Variable *)calloc(sizeof(Variable), num_args+1);
node->func.args[0] = (Variable){"syscall_num", type_new(TYPE_INT), 0};
for (int i = 0; i < num_args; i++) {
node->func.args[i+1].type = type_new(TYPE_ANY);
}
push_builtin(node);
}
void push_posix_constants();
void initialize_builtins()
{
push_posix_constants();
#if __APPLE__
push_constant("OS_IS_MACOS", 1);
push_constant("OS_IS_LINUX", 0);
#else
push_constant("OS_IS_MACOS", 0);
push_constant("OS_IS_LINUX", 1);
#endif
Node *node;
// FIXME: The `TYPE_ANY` is a hack
node = Node_new(AST_BUILTIN);
node->func.name = "print";
node->func.return_type = type_new(TYPE_INT);
node->func.num_args = 1;
node->func.args = (Variable *)calloc(sizeof(Variable), 1);
node->func.args[0] = (Variable){"val", type_new(TYPE_ANY), 0};
push_builtin(node);
push_syscall_builtin("syscall0", 0);
push_syscall_builtin("syscall1", 1);
push_syscall_builtin("syscall2", 2);
push_syscall_builtin("syscall3", 3);
push_syscall_builtin("syscall4", 4);
push_syscall_builtin("syscall5", 5);
push_syscall_builtin("syscall6", 6);
push_syscall_builtin("syscall7", 7);
}
Node *find_builtin_function(Token *token)
{
for (i64 i = 0; i < custom_builtins_count; i++) {
if (strcmp(custom_builtins[i]->func.name, token->value.as_string) == 0)
return custom_builtins[i];
}
return NULL;
}
char *x86_64_syscall_regs[10] = {
"rax", "rdi", "rsi", "rdx", "rcx", "r8", "r9", "r10", "r11", "r12"
};
static void generate_syscall_builtins(FILE *out)
{
for (i64 sysc_args = 0; sysc_args < 7; sysc_args++) {
fprintf(out, "func_syscall%lld:\n", sysc_args);
for (i64 i = 0; i < sysc_args+1; i++)
fprintf(out, " mov %s, [rsp+%lld]\n", x86_64_syscall_regs[i], (i+1) * 8);
fprintf(out, " syscall\n");
fprintf(out, " ret\n");
}
}
static void generate_custom_builtins(FILE *out)
{
// Stolen shamelessly from tsoding/porth:
// https://gitlab.com/tsoding/porth
fprintf(out,
"func_print:\n"
" mov rdi, [rsp+8]\n"
" mov r9, -3689348814741910323\n"
" sub rsp, 40\n"
" mov byte [rsp+31], 10\n"
" lea rcx, [rsp+30]\n"
" mov qword rbx, 0\n"
".L2:\n"
" mov rax, rdi\n"
" lea r8, [rsp+32]\n"
" mul r9\n"
" mov rax, rdi\n"
" sub r8, rcx\n"
" shr rdx, 3\n"
" lea rsi, [rdx+rdx*4]\n"
" add rsi, rsi\n"
" sub rax, rsi\n"
" add eax, 48\n"
" mov byte [rcx], al\n"
" mov rax, rdi\n"
" mov rdi, rdx\n"
" mov rdx, rcx\n"
" sub rcx, 1\n"
" cmp rax, 9\n"
" ja .L2\n"
" lea rax, [rsp+32]\n"
" mov edi, 1\n"
" sub rdx, rax\n"
" xor eax, eax\n"
" lea rsi, [rsp+32+rdx]\n"
" mov rdx, r8\n"
);
generate_syscall(SYS_write, out);
fprintf(out, " add rsp, 40\n");
fprintf(out, " ret\n");
}
void generate_builtins(FILE *out)
{
generate_custom_builtins(out);
generate_syscall_builtins(out);
}
#define PUSH_SYS_(name) push_constant("SYS_" #name, get_syscall_num(SYS_##name))
#define PUSH(name) push_constant(#name, name)
void push_posix_constants()
{
PUSH_SYS_(read);
PUSH_SYS_(write);
PUSH_SYS_(exit);
PUSH_SYS_(open);
PUSH_SYS_(lseek);
PUSH_SYS_(openat);
PUSH_SYS_(close);
PUSH_SYS_(fork);
PUSH_SYS_(wait4);
PUSH_SYS_(mmap);
PUSH(SEEK_SET);
PUSH(SEEK_CUR);
PUSH(SEEK_END);
PUSH(O_RDONLY);
PUSH(O_WRONLY);
PUSH(O_RDWR);
PUSH(O_CREAT);
PUSH(O_EXCL);
PUSH(O_TRUNC);
PUSH(AT_FDCWD);
PUSH(PROT_READ);
PUSH(PROT_WRITE);
PUSH(PROT_EXEC);
PUSH(PROT_NONE);
PUSH(MAP_SHARED);
PUSH(MAP_PRIVATE);
PUSH(MAP_ANONYMOUS);
PUSH(MAP_FIXED);
push_constant("MAP_FAILED", (i64)MAP_FAILED);
}
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