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#include <ejit/ejit.h>
#include "../../deps/lightening/lightening/lightening.c"
#include "../common.h"
static void *alloc_arena(size_t size)
{
return mmap(NULL, size,
PROT_EXEC | PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
}
static void free_arena(void *arena, size_t size)
{
munmap(arena, size);
}
static size_t grploc_count(struct ejit_func *f)
{
return f->gpr >= jit_v_num() ? 0 : f->gpr - jit_v_num();
}
static size_t frploc_count(struct ejit_func *f)
{
return f->fpr >= jit_vf_num() ? 0 : f->fpr - jit_vf_num();
}
static size_t stack_size(struct ejit_func *f)
{
return grploc_count(f) * sizeof(jit_uword_t)
+ frploc_count(f) * sizeof(jit_float64_t);
}
static jit_off_t stack_loc(struct ejit_func *f, size_t l)
{
assert(l >= jit_v_num());
return (l - jit_v_num()) * sizeof(jit_uword_t);
}
static jit_off_t stack_loc_f(struct ejit_func *f, size_t l)
{
assert(l >= jit_vf_num());
return grploc_count(f) * sizeof(jit_uword_t)
+ (l - jit_vf_num()) * sizeof(jit_float64_t);
}
struct reloc_helper {
jit_reloc_t r;
size_t to;
};
static jit_gpr_t getloc(struct ejit_func *f, jit_state_t *j, size_t l, size_t i)
{
if (l < jit_v_num())
return jit_v(l);
jit_ldxi(j, jit_r(i), JIT_SP, stack_loc(f, l));
return jit_r(i);
}
static jit_gpr_t getreg(struct ejit_func *f, size_t l, size_t i)
{
if (l < jit_v_num())
return jit_v(l);
return jit_r(i);
}
static void putloc(struct ejit_func *f, jit_state_t *j, size_t l, jit_gpr_t r)
{
if (l < jit_v_num()) {
assert(jit_v(l).regno == r.regno);
return;
}
jit_stxi(j, stack_loc(f, l), JIT_SP, r);
}
static void compile_label(jit_state_t *j, size_t ii, struct vec *labels)
{
vect_at(jit_addr_t, *labels, ii) = jit_address(j);
}
static void compile_movi(struct ejit_func *f, jit_state_t *j, struct ejit_insn i)
{
jit_gpr_t r = getreg(f, i.r0, 0);
jit_movi(j, r, i.o);
putloc(f, j, i.r0, r);
}
static void compile_addr(struct ejit_func *f, jit_state_t *j, struct ejit_insn i)
{
jit_gpr_t dst = getreg(f, i.r0, 0);
jit_gpr_t src0 = getloc(f, j, i.r1, 1);
jit_gpr_t src1 = getloc(f, j, i.r2, 2);
jit_addr(j, dst, src0, src1);
putloc(f, j, i.r0, dst);
}
static void compile_bltr(struct ejit_func *f, jit_state_t *j, struct ejit_insn i, struct vec *relocs)
{
jit_gpr_t c0 = getloc(f, j, i.r1, 0);
jit_gpr_t c1 = getloc(f, j, i.r2, 1);
jit_reloc_t r = jit_bltr(j, c0, c1);
struct reloc_helper h = {.r = r, .to = i.r0};
vect_append(struct reloc_helper, *relocs, &h);
}
static size_t compile_fn_body(struct ejit_func *f, jit_state_t *j, void *arena, size_t size)
{
jit_begin(j, arena, size);
size_t gprs = f->gpr >= jit_v_num() ? jit_v_num() : f->gpr;
size_t fprs = f->fpr >= jit_vf_num() ? jit_vf_num() : f->fpr;
size_t frame = jit_enter_jit_abi(j, gprs, fprs, 0);
size_t stack = jit_align_stack(j, stack_size(f));
struct vec relocs = vec_create(sizeof(struct reloc_helper));
struct vec labels = vec_create(sizeof(jit_addr_t));
vec_reserve(&labels, vec_len(&f->insns));
foreach_vec(ii, f->insns) {
struct ejit_insn i = vect_at(struct ejit_insn, f->insns, ii);
switch (i.op) {
case MOVI: compile_movi(f, j, i); break;
case ADDR: compile_addr(f, j, i); break;
case BLTR: compile_bltr(f, j, i, &relocs); break;
case LABEL: compile_label(j, ii, &labels); break;
case RET: {
jit_gpr_t r = getloc(f, j, i.r0, 0);
/* R0 won't get overwritten by jit_leave_jit_abi */
jit_movr(j, JIT_R0, r);
jit_shrink_stack(j, stack);
jit_leave_jit_abi(j, gprs, fprs, frame);
jit_retr(j, JIT_R0);
break;
}
case START: continue;
case END: continue;
default: abort();
}
}
foreach_vec(ri, relocs) {
struct reloc_helper h = vect_at(struct reloc_helper, relocs, ri);
jit_addr_t a = vect_at(jit_addr_t, labels, h.to);
jit_reloc_t r = h.r;
assert(a);
jit_patch_there(j, r, a);
}
vec_destroy(&relocs);
vec_destroy(&labels);
if (jit_end(j, &size))
return 0;
return size;
}
bool ejit_compile(struct ejit_func *f)
{
if (!init_jit())
return false;
jit_state_t *j = jit_new_state(NULL, NULL);
assert(j);
void *arena = NULL;
size_t size = 4096;
while (1) {
arena = alloc_arena(size);
assert(arena);
size_t required_size = compile_fn_body(f, j, arena, size);
if (required_size == 0)
break;
free_arena(arena, size);
size = required_size + 4096;
}
jit_destroy_state(j);
f->arena = arena;
f->size = size;
return true;
}
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