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Avoid variable length arrays and remove declarations within code

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MSVC doesn't support C99, and building as C++ to be able to use them is
dangerous, as C++ and C99 are incompatible.

Introduce a VARIABLE_ARRAY macro that either uses VLA when supported,
or alloca() otherwise. Note that using alloca() inside loops doesn't
quite work like VLAs, thus the use of VARIABLE_ARRAY there is discouraged.
It might be worth investigating ways to check whether VARIABLE_ARRAY is
used in such context at runtime in debug builds and bail out if that
happens.
This commit is contained in:
Mike Hommey 2012-04-24 23:22:02 +02:00 • committed by Jason Evans
parent f278994029
commit 8b49971d0c
7 changed files with 43 additions and 18 deletions
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4
src/stats.c
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@ -498,7 +498,7 @@ stats_print(void (*write_cb)(void *, const char *), void *cbopaque,
CTL_GET("arenas.narenas", &narenas, unsigned);
{
bool initialized[narenas];
VARIABLE_ARRAY(bool, initialized, narenas);
size_t isz;
unsigned i, ninitialized;
@ -527,7 +527,7 @@ stats_print(void (*write_cb)(void *, const char *), void *cbopaque,
CTL_GET("arenas.narenas", &narenas, unsigned);
{
bool initialized[narenas];
VARIABLE_ARRAY(bool, initialized, narenas);
size_t isz;
unsigned i;