mirror of
https://github.com/revng/revng
synced 2026-06-21 14:07:57 +00:00
Pietro Fezzardi
14d40096b7
These two parts of the code needed to be separated into libraries because they were used both by the old C backend and by IRCanonicalization. Now that the old C backend is dead, they have been incorporated into IRCanonicalization. Further changes are necessary to strip away the last leftovers of the old C backend from MarkAnalysis.
85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
//
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// Copyright rev.ng Labs Srl. See LICENSE.md for details.
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//
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#include "revng/Model/LoadModelPass.h"
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#include "revng-c/Backend/CBackendPass.h"
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#include "revng-c/Backend/DecompileFunction.h"
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#include "revng-c/Backend/VariableScopeAnalysisPass.h"
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#include "revng-c/RestructureCFGPass/RestructureCFG.h"
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#include "revng-c/Support/FunctionFileHelpers.h"
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#include "revng-c/Support/FunctionTags.h"
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#include "revng-c/TargetFunctionOption/TargetFunctionOption.h"
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using namespace llvm;
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using llvm::cl::NumOccurrencesFlag;
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static cl::opt<std::string> DecompiledDir("c-decompiled-dir",
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cl::desc("decompiled C code dir"),
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cl::value_desc("c-decompiled-dir"),
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cl::cat(MainCategory),
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NumOccurrencesFlag::Optional);
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char BackendPass::ID = 0;
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using Register = RegisterPass<BackendPass>;
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static Register X("c-backend", "Decompilation Backend Pass", false, false);
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BackendPass::BackendPass(std::unique_ptr<llvm::raw_ostream> Out) :
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llvm::FunctionPass{ ID }, Out{ std::move(Out) } {
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}
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BackendPass::BackendPass() : BackendPass(nullptr) {
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}
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void BackendPass::getAnalysisUsage(llvm::AnalysisUsage &AU) const {
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AU.addRequired<LoadModelWrapperPass>();
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AU.addRequired<RestructureCFG>();
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AU.addRequired<VariableScopeAnalysisPass>();
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AU.setPreservesAll();
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}
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bool BackendPass::runOnFunction(llvm::Function &F) {
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// Skip non-isolated functions
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auto FTags = FunctionTags::TagsSet::from(&F);
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if (not FTags.contains(FunctionTags::Isolated))
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return false;
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// If the `-single-decompilation` option was passed from command line, skip
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// decompilation for all the functions that are not the selected one.
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if (not TargetFunction.empty())
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if (not F.getName().equals(TargetFunction.c_str()))
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return false;
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// If the -c-decompiled-dir flag was passed, the decompiled function needs to
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// be written to file, in the specified directory. We initialize Out with a
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// proper file descriptor to make it happen.
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if (DecompiledDir.getNumOccurrences())
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Out = openFunctionFile(DecompiledDir, F.getName(), ".c");
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// Get the Abstract Syntax Tree of the restructured code.
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auto &RestructureCFGAnalysis = getAnalysis<RestructureCFG>();
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ASTTree &GHAST = RestructureCFGAnalysis.getAST();
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// Get the model
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const auto
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&Model = getAnalysis<LoadModelWrapperPass>().get().getReadOnlyModel();
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auto &VariableScopeAnalysis = getAnalysis<VariableScopeAnalysisPass>();
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const auto &TopScopeVariables = VariableScopeAnalysis.getTopScopeVariables();
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bool NeedsLoopVar = VariableScopeAnalysis.needsLoopStateVar();
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// String-based decompiler
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decompileFunction(F,
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GHAST,
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*Model.get(),
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*Out,
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TopScopeVariables,
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NeedsLoopVar);
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return false;
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}
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