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//===- Passes.cpp - Parsing, selection, and running of passes -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/// \file
///
/// This file provides the infrastructure to parse and build a custom pass
/// manager based on a commandline flag. It also provides helpers to aid in
/// analyzing, debugging, and testing pass structures.
///
//===----------------------------------------------------------------------===//
#include "Passes.h"
#include "llvm/Analysis/LazyCallGraph.h"
#include "llvm/IR/IRPrintingPasses.h"
#include "llvm/IR/PassManager.h"
#include "llvm/IR/Verifier.h"
#include "llvm/Support/Debug.h"
using namespace llvm;
namespace {
/// \brief No-op module pass which does nothing.
struct NoOpModulePass {
PreservedAnalyses run(Module *M) { return PreservedAnalyses::all(); }
static StringRef name() { return "NoOpModulePass"; }
};
/// \brief No-op function pass which does nothing.
struct NoOpFunctionPass {
PreservedAnalyses run(Function *F) { return PreservedAnalyses::all(); }
static StringRef name() { return "NoOpFunctionPass"; }
};
} // End anonymous namespace.
// FIXME: Factor all of the parsing logic into a .def file that we include
// under different macros.
static bool isModulePassName(StringRef Name) {
if (Name == "no-op-module") return true;
if (Name == "print") return true;
if (Name == "print-cg") return true;
return false;
}
static bool isFunctionPassName(StringRef Name) {
if (Name == "no-op-function") return true;
if (Name == "print") return true;
return false;
}
static bool parseModulePassName(ModulePassManager &MPM, StringRef Name) {
if (Name == "no-op-module") {
MPM.addPass(NoOpModulePass());
return true;
}
if (Name == "print") {
MPM.addPass(PrintModulePass(dbgs()));
return true;
}
if (Name == "print-cg") {
MPM.addPass(LazyCallGraphPrinterPass(dbgs()));
return true;
}
return false;
}
static bool parseFunctionPassName(FunctionPassManager &FPM, StringRef Name) {
if (Name == "no-op-function") {
FPM.addPass(NoOpFunctionPass());
return true;
}
if (Name == "print") {
FPM.addPass(PrintFunctionPass(dbgs()));
return true;
}
return false;
}
static bool parseFunctionPassPipeline(FunctionPassManager &FPM,
StringRef &PipelineText,
bool VerifyEachPass) {
for (;;) {
// Parse nested pass managers by recursing.
if (PipelineText.startswith("function(")) {
FunctionPassManager NestedFPM;
// Parse the inner pipeline inte the nested manager.
PipelineText = PipelineText.substr(strlen("function("));
if (!parseFunctionPassPipeline(NestedFPM, PipelineText, VerifyEachPass) ||
PipelineText.empty())
return false;
assert(PipelineText[0] == ')');
PipelineText = PipelineText.substr(1);
// Add the nested pass manager with the appropriate adaptor.
FPM.addPass(std::move(NestedFPM));
} else {
// Otherwise try to parse a pass name.
size_t End = PipelineText.find_first_of(",)");
if (!parseFunctionPassName(FPM, PipelineText.substr(0, End)))
return false;
if (VerifyEachPass)
FPM.addPass(VerifierPass());
PipelineText = PipelineText.substr(End);
}
if (PipelineText.empty() || PipelineText[0] == ')')
return true;
assert(PipelineText[0] == ',');
PipelineText = PipelineText.substr(1);
}
}
static bool parseModulePassPipeline(ModulePassManager &MPM,
StringRef &PipelineText,
bool VerifyEachPass) {
for (;;) {
// Parse nested pass managers by recursing.
if (PipelineText.startswith("module(")) {
ModulePassManager NestedMPM;
// Parse the inner pipeline into the nested manager.
PipelineText = PipelineText.substr(strlen("module("));
if (!parseModulePassPipeline(NestedMPM, PipelineText, VerifyEachPass) ||
PipelineText.empty())
return false;
assert(PipelineText[0] == ')');
PipelineText = PipelineText.substr(1);
// Now add the nested manager as a module pass.
MPM.addPass(std::move(NestedMPM));
} else if (PipelineText.startswith("function(")) {
FunctionPassManager NestedFPM;
// Parse the inner pipeline inte the nested manager.
PipelineText = PipelineText.substr(strlen("function("));
if (!parseFunctionPassPipeline(NestedFPM, PipelineText, VerifyEachPass) ||
PipelineText.empty())
return false;
assert(PipelineText[0] == ')');
PipelineText = PipelineText.substr(1);
// Add the nested pass manager with the appropriate adaptor.
MPM.addPass(createModuleToFunctionPassAdaptor(std::move(NestedFPM)));
} else {
// Otherwise try to parse a pass name.
size_t End = PipelineText.find_first_of(",)");
if (!parseModulePassName(MPM, PipelineText.substr(0, End)))
return false;
if (VerifyEachPass)
MPM.addPass(VerifierPass());
PipelineText = PipelineText.substr(End);
}
if (PipelineText.empty() || PipelineText[0] == ')')
return true;
assert(PipelineText[0] == ',');
PipelineText = PipelineText.substr(1);
}
}
// Primary pass pipeline description parsing routine.
// FIXME: Should this routine accept a TargetMachine or require the caller to
// pre-populate the analysis managers with target-specific stuff?
bool llvm::parsePassPipeline(ModulePassManager &MPM, StringRef PipelineText,
bool VerifyEachPass) {
// Look at the first entry to figure out which layer to start parsing at.
if (PipelineText.startswith("module("))
return parseModulePassPipeline(MPM, PipelineText, VerifyEachPass) &&
PipelineText.empty();
if (PipelineText.startswith("function(")) {
FunctionPassManager FPM;
if (!parseFunctionPassPipeline(FPM, PipelineText, VerifyEachPass) ||
!PipelineText.empty())
return false;
MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
return true;
}
// This isn't a direct pass manager name, look for the end of a pass name.
StringRef FirstName =
PipelineText.substr(0, PipelineText.find_first_of(",)"));
if (isModulePassName(FirstName))
return parseModulePassPipeline(MPM, PipelineText, VerifyEachPass) &&
PipelineText.empty();
if (isFunctionPassName(FirstName)) {
FunctionPassManager FPM;
if (!parseFunctionPassPipeline(FPM, PipelineText, VerifyEachPass) ||
!PipelineText.empty())
return false;
MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
return true;
}
return false;
}
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