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Make *allocx() size class overflow behavior defined.

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Limit supported size and alignment to HUGE_MAXCLASS, which in turn is
now limited to be less than PTRDIFF_MAX.

This resolves #278 and #295.
This commit is contained in:
Jason Evans
2016-02-25 15:29:49 -08:00
parent 767d85061a
commit 0c516a00c4
14 changed files with 247 additions and 89 deletions
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14
doc/jemalloc.xml.in
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@@ -310,16 +310,14 @@
<para>The <function>mallocx<parameter/></function> function allocates at
least <parameter>size</parameter> bytes of memory, and returns a pointer
to the base address of the allocation. Behavior is undefined if
<parameter>size</parameter> is <constant>0</constant>, or if request size
overflows due to size class and/or alignment constraints.</para>
<parameter>size</parameter> is <constant>0</constant>.</para>
<para>The <function>rallocx<parameter/></function> function resizes the
allocation at <parameter>ptr</parameter> to be at least
<parameter>size</parameter> bytes, and returns a pointer to the base
address of the resulting allocation, which may or may not have moved from
its original location. Behavior is undefined if
<parameter>size</parameter> is <constant>0</constant>, or if request size
overflows due to size class and/or alignment constraints.</para>
<parameter>size</parameter> is <constant>0</constant>.</para>
<para>The <function>xallocx<parameter/></function> function resizes the
allocation at <parameter>ptr</parameter> in place to be at least
@@ -354,10 +352,10 @@
memory, but it performs the same size computation as the
<function>mallocx<parameter/></function> function, and returns the real
size of the allocation that would result from the equivalent
<function>mallocx<parameter/></function> function call. Behavior is
undefined if <parameter>size</parameter> is <constant>0</constant>, or if
request size overflows due to size class and/or alignment
constraints.</para>
<function>mallocx<parameter/></function> function call, or
<constant>0</constant> if the inputs exceed the maximum supported size
class and/or alignment. Behavior is undefined if
<parameter>size</parameter> is <constant>0</constant>.</para>
<para>The <function>mallctl<parameter/></function> function provides a
general interface for introspecting the memory allocator, as well as