[LLVMdev] Emit a jump instruction to a place inside basicblock (original) (raw)
Robin Morisset morisset at google.com
Thu Oct 30 11:33:16 PDT 2014
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Hi,
From my understanding of the LLVM IR, it is impossible to jump to the middle of a Basic Block, only to its beginning. But there is a splitBasicBlock function that seems like it might be useful to you, to make sure a basic block is starting at the exact place you want to jump.
Best regards, Robin
On Wed Oct 29 2014 at 2:28:09 PM Xiaoguang Wang <xgwang09 at gmail.com> wrote:
Hi all,
I'm a beginner in LLVM. Currently, I want to implement a pass that generates a jump table. The entry in that table is a jump to some place (may be an instruction) in a basic block. I'm reading the JumpTable code in llvm 3.5, there is a table which contains jump entries to functions. In AsmPrinter::doFinalization function from file lib/CodeGen/AsmPrinter/AsmPrinter.cpp, it gets a MCSymbolRefExpr from the function symbol. While my question is, is there a way to insert jump to place inside a basic block? Thanks! Xiaoguang
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