Op 13-10-2025 om 04:00 schreef Lioric Z3:
>There are no memory errors reported by the sanitized tcc compiler.
>So how can I reproduce this?
Forgot to mention that this leak was initially observed when compiling
to a memory target using *libtcc*, with *backtrace* enabled and *stabs
debug symbols* generated.
But I don’t see any reason this behavior would differ when compiling
with the *tcc executable*, so I tested it there as well — and the bug
is reproducible using the "|-g -bt"| options. (without debug symbols
or backtrace, the memory limit is rarely reached, so the leak does not
appear.)
I have *not* yet tested with backtrace disabled, so please make sure
to build TCC with "|--config-backtrace=yes" configure option| when
reproducing.
The macro string needs to be large enough for the reallocator to
switch to the *native allocator* (via |default_reallocator|).
I haven’t yet traced why the memory limit is hit so quickly when debug
symbols and backtrace information are enabled, but I probably the
*debug symbol allocations* also use the *TAL allocator*, which could
fill the memory pool faster.
That said, this is still speculation — I haven’t traced the stabs
debug handling or creation paths at all yet.
In my local setup, the issue can be reproduced with the following code:
----------
#define cl_inst(cl) \
void $_##cl##_ctor(void* addr) { cl obj = (cl)addr; obj->$meta =
$_##cl##_OM; } \
void $_##cl##_hx_construct(cl this, int i, float f, bool b) {
this->iValue = i; this->fValue = f; this->bValue = b; } \
static inline cl $_new_##cl() { return
$_new($_##cl##_OM->size,#cl,$_##cl##_ctor); } \
static const int $_sMemberFields[] = { \
{&OS_STRING_S("iValue",0), 1,offsetof(obj,name)}, \
{&OS_STRING_S("fValue",0), 2,offsetof(obj,type)}, \
{&OS_STRING_S("bValue",0), 3,offsetof(obj,offset)}, \
{0} \
}; \
#line 1 ""
cl_inst(int);
This testcase helped a lot.
I pushed a fix on mob.
Herman
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