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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4759 91177308-0d34-0410-b5e6-96231b3b80d8
58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
//===----------------------------------------------------------------------===//
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// LLVM extract Utility
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//
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// This utility changes the input module to only contain a single function,
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// which is primarily used for debugging transformations.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Bytecode/WriteBytecodePass.h"
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#include "llvm/Transforms/IPO.h"
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#include "Support/CommandLine.h"
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#include <memory>
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// InputFilename - The filename to read from.
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static cl::opt<std::string>
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InputFilename(cl::Positional, cl::desc("<input bytecode file>"),
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cl::init("-"), cl::value_desc("filename"));
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// ExtractFunc - The function to extract from the module... defaults to main.
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static cl::opt<std::string>
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ExtractFunc("func", cl::desc("Specify function to extract"), cl::init("main"),
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cl::value_desc("function"));
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int main(int argc, char **argv) {
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cl::ParseCommandLineOptions(argc, argv, " llvm extractor\n");
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std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
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if (M.get() == 0) {
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std::cerr << argv[0] << ": bytecode didn't read correctly.\n";
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return 1;
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}
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// Figure out which function we should extract
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Function *F = M.get()->getNamedFunction(ExtractFunc);
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if (F == 0) {
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std::cerr << argv[0] << ": program doesn't contain function named '"
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<< ExtractFunc << "'!\n";
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return 1;
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}
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// In addition to just parsing the input from GCC, we also want to spiff it up
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// a little bit. Do this now.
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//
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PassManager Passes;
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Passes.add(createFunctionExtractionPass(F)); // Extract the function
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Passes.add(createGlobalDCEPass()); // Delete unreachable globals
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Passes.add(createFunctionResolvingPass()); // Delete prototypes
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Passes.add(createDeadTypeEliminationPass()); // Remove dead types...
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Passes.add(new WriteBytecodePass(&std::cout)); // Write bytecode to file...
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Passes.run(*M.get());
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return 0;
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}
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