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/*
* Copyright (C) 2020-2021 Jo-Philipp Wich <jo@mein.io>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <assert.h>
#include "ucode/chunk.h"
#include "ucode/types.h"
#include "ucode/util.h"
#define OFFSETINFO_BITS (sizeof(((uc_offsetinfo_t *)NULL)->entries[0]) * 8)
#define OFFSETINFO_BYTE_BITS 3
#define OFFSETINFO_INSN_BITS (OFFSETINFO_BITS - OFFSETINFO_BYTE_BITS)
#define OFFSETINFO_MAX_BYTES ((1 << OFFSETINFO_BYTE_BITS) - 1)
#define OFFSETINFO_MAX_INSNS ((1 << OFFSETINFO_INSN_BITS) - 1)
#define OFFSETINFO_NUM_BYTES(n) ((n) & OFFSETINFO_MAX_BYTES)
#define OFFSETINFO_NUM_INSNS(n) ((n) >> OFFSETINFO_BYTE_BITS)
#define OFFSETINFO_ENCODE(line, insns) ((line & OFFSETINFO_MAX_BYTES) | (((insns) << OFFSETINFO_BYTE_BITS) & ~OFFSETINFO_MAX_BYTES))
void
uc_chunk_init(uc_chunk_t *chunk)
{
chunk->count = 0;
chunk->entries = NULL;
chunk->ehranges.count = 0;
chunk->ehranges.entries = NULL;
chunk->debuginfo.offsets.count = 0;
chunk->debuginfo.offsets.entries = NULL;
chunk->debuginfo.variables.count = 0;
chunk->debuginfo.variables.entries = NULL;
uc_vallist_init(&chunk->debuginfo.varnames);
}
void
uc_chunk_free(uc_chunk_t *chunk)
{
uc_vector_clear(chunk);
uc_vector_clear(&chunk->ehranges);
uc_vector_clear(&chunk->debuginfo.offsets);
uc_vector_clear(&chunk->debuginfo.variables);
uc_vallist_free(&chunk->debuginfo.varnames);
uc_chunk_init(chunk);
}
size_t
uc_chunk_add(uc_chunk_t *chunk, uint8_t byte, size_t offset)
{
uc_offsetinfo_t *offsets = &chunk->debuginfo.offsets;
size_t i;
uc_vector_push(chunk, byte);
/* offset info is encoded in bytes, for each byte, the first three bits
* specify the number of source text bytes to advance since the last entry
* and the remaining five bits specify the amount of instructions belonging
* to any given source text offset */
if (offset > 0 || offsets->count == 0) {
/* if this offset is farther than seven (2 ** 3 - 1) bytes apart from
* the last one, we need to emit intermediate "jump" bytes with zero
* instructions each */
for (i = offset; i > OFFSETINFO_MAX_BYTES; i -= OFFSETINFO_MAX_BYTES) {
/* advance by 7 bytes */
uc_vector_push(offsets, OFFSETINFO_ENCODE(OFFSETINFO_MAX_BYTES, 0));
}
/* advance by `i` bytes, count one instruction */
uc_vector_push(offsets, OFFSETINFO_ENCODE(i, 1));
}
/* update instruction count at current offset entry */
else {
/* since we encode the per-offset instruction count in five bits, we
* can only count up to 31 instructions. If we exceed that limit,
* emit another offset entry with the initial three bits set to zero */
if (OFFSETINFO_NUM_INSNS(offsets->entries[offsets->count - 1]) >= OFFSETINFO_MAX_INSNS) {
/* advance by 0 bytes, count one instruction */
uc_vector_push(offsets, OFFSETINFO_ENCODE(0, 1));
}
else {
uint8_t *prev = uc_vector_last(offsets);
*prev = OFFSETINFO_ENCODE(
OFFSETINFO_NUM_BYTES(*prev),
OFFSETINFO_NUM_INSNS(*prev) + 1);
}
}
return chunk->count - 1;
}
void
uc_chunk_pop(uc_chunk_t *chunk)
{
uc_offsetinfo_t *offsets = &chunk->debuginfo.offsets;
int n_insns;
assert(chunk->count > 0);
chunk->count--;
n_insns = OFFSETINFO_NUM_INSNS(offsets->entries[offsets->count - 1]);
if (n_insns > 0) {
uint8_t *prev = uc_vector_last(offsets);
*prev = OFFSETINFO_ENCODE(OFFSETINFO_NUM_BYTES(*prev), n_insns - 1);
}
else {
offsets->count--;
}
}
size_t
uc_chunk_debug_get_srcpos(uc_chunk_t *chunk, size_t off)
{
uc_offsetinfo_t *offsets = &chunk->debuginfo.offsets;
size_t i, inum = 0, lnum = 0;
if (!offsets->count)
return 0;
for (i = 0; i < offsets->count && inum < off; i++) {
lnum += OFFSETINFO_NUM_BYTES(offsets->entries[i]);
inum += OFFSETINFO_NUM_INSNS(offsets->entries[i]);
}
return lnum;
}
void
uc_chunk_debug_add_variable(uc_chunk_t *chunk, size_t from, size_t to, size_t slot, bool upval, uc_value_t *name)
{
uc_variables_t *variables = &chunk->debuginfo.variables;
uc_value_list_t *varnames = &chunk->debuginfo.varnames;
assert(slot <= ((size_t)-1 / 2));
if (upval)
slot += (size_t)-1 / 2;
uc_vector_push(variables, {
.nameidx = uc_vallist_add(varnames, name),
.slot = slot,
.from = from,
.to = to
});
}
uc_value_t *
uc_chunk_debug_get_variable(uc_chunk_t *chunk, size_t off, size_t slot, bool upval)
{
uc_variables_t *variables = &chunk->debuginfo.variables;
uc_value_list_t *varnames = &chunk->debuginfo.varnames;
uc_value_t *name = NULL;
size_t i;
assert(slot <= ((size_t)-1 / 2));
if (upval)
slot += (size_t)-1 / 2;
for (i = 0; i < variables->count; i++) {
if (variables->entries[i].slot != slot ||
variables->entries[i].from > off ||
variables->entries[i].to < off)
continue;
name = uc_vallist_get(varnames, variables->entries[i].nameidx);
}
return name;
}
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