A fix is available
APAR status
Closed as program error.
Error description
In situations when client's code has large number of instantiations implemented in similar patterns in multiple functions, it can cause C++ to run out of memory. Example of the code the shows the problem (this particular example does not run out of memory due to a small number of instantiations, in practice the number of instantiations should be on much larger scale): template <class A, int I> struct container{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,1>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,2>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,3>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,4>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,5>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,6>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,7>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,8>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,9>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,10>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,11>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,12>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,13>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,14>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,15>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,16>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,17>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,18>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,19>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class B> struct container<B,20>{ template <class C,int J> container(const container<C,J>& arg) {} }; template <class C, int J> container<C,J>& func( ); template <class C, int J> container<C,J> func2( ); template <int K> void test(int L) { switch(L){ case 1: for(int a=5; a< 100; a++) { for(int b = 10; b< 200; b++) { func<int,1+K>() = func2<int,1+1+K>(); func<int,2+K>() = func2<int,1+1+K>(); func<int,3+K>() = func2<int,1+1+K>(); func<int,4+K>() = func2<int,1+1+K>(); func<int,5+K>() = func2<int,1+1+K>(); func<int,6+K>() = func2<int,1+1+K>(); func<int,7+K>() = func2<int,1+1+K>(); func<int,8+K>() = func2<int,1+1+K>(); func<int,9+K>() = func2<int,1+1+K>(); func<int,10+K>() = func2<int,1+1+K>(); }} }; } int main(void) { test<1>(1); return 0; }
Local fix
N/A
Problem summary
The compiler was running out of memory processing a complex function body with many implicit instantiations required during type checking.
Problem conclusion
This fix is protected by an xflag in the 90.bg release, but its enabled by default for furture releases of the compiler as it decreases the amount of memory required when there are large numbers of implicit instantiations required in a single function body.
Temporary fix
Comments
APAR Information
APAR number
LI75523
Reported component name
XL C/C++ AE BG/
Reported component ID
5799HJH00
Reported release
900
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2010-06-09
Closed date
2010-09-13
Last modified date
2010-09-13
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
XL C/C++ AE BG/
Fixed component ID
5799HJH00
Applicable component levels
R900 PSY
UP
[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSJT9L","label":"XL C\/C++"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.0","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]
Document Information
Modified date:
16 October 2021