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dlmalloc: add a temporary workaround for a segfault (#13120)

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playX 2022-01-10 16:54:23 +03:00 committed by GitHub
parent da0b89cc57
commit 65eb383cfd
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 28 additions and 9 deletions
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37
vlib/dlmalloc/dlmalloc.v
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@ -16,14 +16,16 @@ module dlmalloc
import math.bits
/*
$if debug ? {
#include "valgrind.h"
}
/*
fn C.VALGRIND_MALLOCLIKE_BLOCK(addr voidptr, size usize, rzb usize,is_zeroed bool)
fn C.VALGRIND_FREELIKE_BLOCK(addr voidptr, rzB usize)
fn C.VALGRIND_MAKE_MEM_UNDEFINED(addr voidptr, size usize)
fn //C.VALGRIND_MALLOCLIKE_BLOCK(addr voidptr, size usize, rzb usize,is_zeroed bool)
fn //C.VALGRIND_FREELIKE_BLOCK(addr voidptr, rzB usize)
fn //C.VALGRIND_MAKE_MEM_UNDEFINED(addr voidptr, size usize)
*/
pub const (
n_small_bins = 32
n_tree_bins = 32
@ -395,6 +397,10 @@ fn (tree &TreeChunk) chunk() &Chunk {
return &tree.chunk
}
fn (tree &TreeChunk) size(treemap u32) usize {
return tree.chunk.head & ~dlmalloc.flag_bits
}
[unsafe]
fn (tree &TreeChunk) next() &TreeChunk {
unsafe {
@ -559,7 +565,7 @@ fn (mut dl Dlmalloc) unlink_large_chunk(chunk_ &TreeChunk) {
fn (mut dl Dlmalloc) unlink_first_small_chunk(head_ &Chunk, next_ &Chunk, idx u32) {
mut next := next_
mut head := head_
println('Unlink first small')
mut ptr := next.prev
if voidptr(head) == voidptr(ptr) {
unsafe { dl.clear_smallmap(idx) }
@ -893,7 +899,7 @@ fn (mut dl Dlmalloc) mark_smallmap(idx u32) {
[unsafe]
fn (mut dl Dlmalloc) smallmap_is_marked(idx u32) bool {
return dl.smallmap & (1 << idx) != 0
return (dl.smallmap & (1 << idx)) != 0
}
[unsafe]
@ -949,7 +955,11 @@ fn (mut dl Dlmalloc) malloc_real(size usize) voidptr {
if nb > dl.dvsize {
// if there's some other bin with some memory, then we just use
// the next smallest bin
if smallbits != 0 {
// todo(playXE): Find out why in the world this part of code does not work in
// some programs (esp. x.json2). Theoretically disabling this path just
// makes fragmentation a little worser but nothing really bad should happen
if false && smallbits != 0 {
leftbits := (smallbits << idx) & left_bits(1 << idx)
leastbit := least_bit(leftbits)
i := u32(bits.trailing_zeros_32(leastbit))
@ -1137,10 +1147,10 @@ fn (mut dl Dlmalloc) sys_alloc(size usize) voidptr {
fn (mut dl Dlmalloc) tmalloc_small(size usize) voidptr {
unsafe {
leastbit := least_bit(dl.treemap)
i := bits.leading_zeros_32(leastbit)
i := bits.trailing_zeros_32(leastbit)
mut v := *dl.treebin_at(u32(i))
mut t := v
mut rsize := t.chunk().size() - size
mut rsize := t.size(dl.treemap)
for {
t = t.leftmost_child()
if isnil(t) {
@ -1156,6 +1166,7 @@ fn (mut dl Dlmalloc) tmalloc_small(size usize) voidptr {
mut vc := v.chunk()
r := &TreeChunk(vc.plus_offset(size))
dl.unlink_large_chunk(v)
if rsize < min_chunk_size() {
vc.set_inuse_and_pinuse(rsize + size)
} else {
@ -1247,8 +1258,16 @@ fn (mut dl Dlmalloc) prepend_alloc(newbase voidptr, oldbase voidptr, size usize)
psize := usize(oldfirst) - usize(p)
mut q := p.plus_offset(size)
mut qsize := psize - size
// C.VALGRIND_MAKE_MEM_UNDEFINED(p.plus_offset(sizeof(usize)),size)
p.set_size_and_pinuse_of_inuse_chunk(size)
if qsize >= sizeof(TreeChunk) {
// C.VALGRIND_MAKE_MEM_UNDEFINED(q, sizeof(TreeChunk))
} else {
// C.VALGRIND_MAKE_MEM_UNDEFINED(q,sizeof(Chunk))
}
// C.VALGRIND_MAKE_MEM_UNDEFINED(q.plus_offset(qsize),sizeof(usize))
if voidptr(oldfirst) == voidptr(dl.top) {
dl.topsize += qsize
tsize := dl.topsize