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Merge https://gitlab.com/wingo/lightening master branch

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This commit is contained in:
Andy Wingo 2020-07-30 13:07:02 +02:00
commit 439e93a5ed
6 changed files with 186 additions and 28 deletions
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61
libguile/lightening/tests/jmp_table.c Normal file
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@ -0,0 +1,61 @@
#include "test.h"
#define NTARGETS ((size_t) 4)
static void
run_test(jit_state_t *j, uint8_t *arena_base, size_t arena_size)
{
jit_begin(j, arena_base, arena_size);
size_t align = jit_enter_jit_abi(j, 0, 0, 0);
jit_load_args_1(j, jit_operand_gpr (JIT_OPERAND_ABI_POINTER, JIT_R0));
jit_reloc_t default_target = jit_bgei_u(j, JIT_R0, NTARGETS);
// FIXME: need ldxr with word stride, then can eliminate lshi.
jit_lshi(j, JIT_R0, JIT_R0, sizeof(intptr_t) == 4 ? 2 : 3);
jit_reloc_t table = jit_mov_addr(j, JIT_R1);
jit_ldxr(j, JIT_R1, JIT_R1, JIT_R0);
jit_jmpr(j, JIT_R1);
jit_begin_data (j);
jit_align(j, sizeof(intptr_t));
jit_patch_here(j, table);
jit_reloc_t targets[NTARGETS];
jit_reloc_t tails[NTARGETS];
for (size_t i = 0; i < NTARGETS; i++) {
targets[i] = jit_emit_addr(j);
}
jit_end_data (j);
for (size_t i = 0; i < NTARGETS; i++) {
jit_patch_here(j, targets[i]);
jit_movi(j, JIT_R0, i * i);
tails[i] = jit_jmp(j);
}
jit_patch_here(j, default_target);
jit_movi(j, JIT_R0, 42);
for (int i = 0; i < NTARGETS; i++) {
jit_patch_here(j, tails[i]);
}
jit_leave_jit_abi(j, 0, 0, align);
jit_retr(j, JIT_R0);
jit_word_t (*f)(jit_word_t) = jit_end(j, NULL);
for (int i = -2; i < ((int) NTARGETS) + 2; i++) {
if (i < 0) {
ASSERT(f(i) == 42);
} else if (i < NTARGETS) {
ASSERT(f(i) == i * i);
} else {
ASSERT(f(i) == 42);
}
}
}
int
main (int argc, char *argv[])
{
return main_helper(argc, argv, run_test);
}

32
libguile/lightening/tests/jmpi.c
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@ -1,21 +1,41 @@
#include "test.h"
static int tail(void) { return 42; }
void *tail;
static void *target;
static void
run_test(jit_state_t *j, uint8_t *arena_base, size_t arena_size)
{
jit_begin(j, arena_base, arena_size);
jit_jmpi(j, tail);
jit_enter_jit_abi(j, 0, 0, 0);
jit_movi(j, JIT_R0, 42);
jit_jmpi(j, target);
// Unreachable.
jit_breakpoint(j);
int (*f)(void) = jit_end(j, NULL);
ASSERT(f() == 42);
}
// Make the tail-call target via a separate main_helper because probably the new
// arena will be allocated farther away, forcing nonlocal jumps.
static void
make_target(jit_state_t *j, uint8_t *arena_base, size_t arena_size)
{
jit_begin(j, arena_base, arena_size);
size_t align = jit_enter_jit_abi(j, 0, 0, 0);
// Tail call target assumes tail caller called enter_jit_abi with compatible
// parameters.
target = jit_address(j);
jit_leave_jit_abi(j, 0, 0, align);
jit_retr(j, JIT_R0);
jit_end(j, NULL);
main_helper(0, NULL, run_test);
}
int
main (int argc, char *argv[])
{
return main_helper(argc, argv, run_test);
return main_helper(argc, argv, make_target);
}