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[llvm-extract] Update the help message for group extraction feature

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Summary:
https://reviews.llvm.org/D60973 exposed the group extraction feature of
the BlockExtractor to llvm-extract.
However, the help message was not updated, so users might not be able to
know how to use this feature without looking into history/commits.

This patch just update the help message to show how to use this group
extraction feature.

Reviewers: qcolombet, volkan

Reviewed By: qcolombet

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66438

llvm-svn: 369438
This commit is contained in:
Jinsong Ji 2019-08-20 20:45:16 +00:00
parent 357f5b0cc3
commit fa4131d59e
1 changed files with 12 additions and 2 deletions
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14
tools/llvm-extract/llvm-extract.cpp
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@ -74,8 +74,18 @@ static cl::list<std::string>
// ExtractBlocks - The blocks to extract from the module.
static cl::list<std::string> ExtractBlocks(
"bb", cl::desc("Specify <function, basic block> pairs to extract"),
cl::ZeroOrMore, cl::value_desc("function:bb"), cl::cat(ExtractCat));
"bb",
cl::desc(
"Specify <function, basic block1[;basic block2...]> pairs to extract.\n"
"Each pair will create a function.\n"
"If multiple basic blocks are specified in one pair,\n"
"the first block in the sequence should dominate the rest.\n"
"eg:\n"
" --bb=f:bb1;bb2 will extract one function with both bb1 and bb2;\n"
" --bb=f:bb1 --bb=f:bb2 will extract two functions, one with bb1, one "
"with bb2."),
cl::ZeroOrMore, cl::value_desc("function:bb1[;bb2...]"),
cl::cat(ExtractCat));
// ExtractAlias - The alias to extract from the module.
static cl::list<std::string>