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Topic created on: April 13, 2009 06:17 CDT by tobias .

Hi,
i'm working on a IDA-Plugin, and want to extract information about the Basic Blocks, but i cant find anything about BasicBlocks in the plugin writing manual.. is there maybe something similar to the IDAPython-function "is_basic_block_end" ?
-tobias

gera		April 13, 2009 08:35.51 CDT
Hi, Not an answer, but to venues to find one: . get the sourcecode for IDAPython and check how is_basic_block_end() is implemented... and then tell us :) I couldn't find it, it looks like it should be implemented and exported by processor modules. I found it in idp.hpp: http://www.google.com/codesearch/p?hl=en#7okKjql2p0g/INCLUDE/idp.hpp&q=is_basic_block_end . The other options is to use some heuristics, what I'm currently doing in idc for a very stupid HotKey I implemented is: `static findBBEnd(ea) { auto bb, first; bb = ea; while (1) { first = Rfirst(bb); if (first == BADADDR) break; /* instruction with no flow (RET) / if (Rnext(bb, first) != BADADDR) break; / instruction with more than flow / if (GetMnem(bb) == "call") break; / we also force stopping on indirect calls call */ bb = Rfirst(bb); } return bb; }` This small function will find the end of the BasicBlock, however, although it can be used as base, it considers BB ends different than what's shown in the graph. It considers a call a BB end, and it does not consider a single outgoing arrow to be a BB end.

dimaky		April 13, 2009 15:30.31 CDT
Actually, as far as I know, there is a function is_basic_block_end in ida sdk. You can find its prototype in idp.hpp. But if you just need basic blocks information for a single routine you may consider using qflow_chart_t class which gathers all the blocks for you.

tobias		April 16, 2009 18:29.04 CDT
hi, thanks, that helped me a lot!

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