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compiler: Clarify recv_rpc value names and documentation [nfc] 

Previously, the phi emitted for the pointer parameter to recv_rpc was –
rather confusingly – called "size", and the pseudo-code in the comment
had bit-rotted.

Signed-off-by: David Nadlinger <code@klickverbot.at>
This commit is contained in:
David Nadlinger 2016-11-07 14:33:17 +00:00 committed by Sebastien Bourdeauducq
parent 4c2e921270
commit f368e1b228
1 changed files with 6 additions and 4 deletions
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10
artiq/compiler/transforms/llvm_ir_generator.py
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@ -1252,10 +1252,12 @@ class LLVMIRGenerator:
self.llbuilder.call(self.llbuiltin("llvm.stackrestore"), [llstackptr])
# T result = {
# void *ptr = NULL;
# loop: int size = rpc_recv("tag", ptr);
# void *ret_ptr = alloca(sizeof(T));
# void *ptr = ret_ptr;
# loop: int size = recv_rpc(ptr);
# // Non-zero: Provide `size` bytes of extra storage for variable-length data.
# if(size) { ptr = alloca(size); goto loop; }
# else *(T*)ptr
# else *(T*)ret_ptr
# }
llprehead = self.llbuilder.basic_block
llhead = self.llbuilder.append_basic_block(name="rpc.head")
@ -1270,7 +1272,7 @@ class LLVMIRGenerator:
self.llbuilder.branch(llhead)
self.llbuilder.position_at_end(llhead)
llphi = self.llbuilder.phi(llslotgen.type, name="rpc.size")
llphi = self.llbuilder.phi(llslotgen.type, name="rpc.ptr")
llphi.add_incoming(llslotgen, llprehead)
if llunwindblock:
llsize = self.llbuilder.invoke(self.llbuiltin("recv_rpc"), [llphi],