grischka 72b520e709 tccgen: flex arrays etc. ...

Fixes potential writes past the allocated space with mostly
illegal flex array initializers. (60_errors_and_warnings.c
:test_var_array)

In exchange suspicious precautions such as section_reserve
or checks with sec->data_allocated were removed.  (There is
an hard check 'init_assert()' for now but it's meant to be
just temporary)

Also, instead of filling holes, always memset(0) structures
& arrays on stack.  Sometimes more efficient, sometimes isn't.
At least we can omit putting null initializers.

About array range inititializers:  Reparsing tokens has a
small problem with sideeffects, for example

   int c = 0, dd[] = { [0 ... 1] = ++c, [2 ... 3] = ++c };

Also, instead of 'squeeze_multi_relocs()', delete pre-existing
relocations in advance. This works even if secondary initializers
don't even have relocations, as with
    [0 ... 7] = &stuff,
    [4] = NULL

Also, in tcc.h: new macro "tcc_internal_error()"

2020-10-03 18:12:46 +02:00

8.7 KiB

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