Garrison Venn
2011-Jul-28 11:14 UTC
[LLVMdev] Aggregate returns possibly failing across JIT boundaries
Using in memory IR, I believe I'm seeing aggregate returns fail when either a generated function calls an external function (not generated), which returns an aggregate, or when an external non-generated function calls a generated one which returns an aggregate. Is this a known issue? Specifically when using a "non-generated" structure with two unsigned char, or two unsigned fields, the second field is always set to zero on the retrieving side when such an instance is returned by value to a generated calling function. The same happens for a "generated" structure composed of two llvm::IntegerType::get(context, 8) fields when returned to a non-generated function,. I have not used other aggregate types or sizes, and am on OS X 64bit. When the appropriate functions, are on the same side of JIT boundary (generated calling generated, and obviously non-generated calling non-generated), the aggregate return works correctly. If this is not a known issue, I will further elaborate with code later. As I switched to using aggregate returning generated functions for generated callees, I have forward progress on my current project albeit with some extra coding effort. ;-) Also can someone point me to the source where such a two member structure is lowered into two registers by the JIT when this structure is used in a return by value scenario? Thanks in advance Garrison
Seemingly Similar Threads
- [LLVMdev] type-system-rewrite branch landing tomorrow
- [LLVMdev] type-system-rewrite branch landing tomorrow
- [LLVMdev] type-system-rewrite branch landing tomorrow
- [LLVMdev] JIT crash takes down host-application
- [LLVMdev] Exception Implementation Example added to Wiki