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a92f696b74
* Renamed StatisticReporter.h/cpp to Statistic.h/cpp * Broke constructor to take two const char * arguments instead of one, so that indendation can be taken care of automatically. * Sort the list by pass name when printing * Make sure to print all statistics as a group, instead of randomly when the statistics dtors are called. * Updated ProgrammersManual with new semantics. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4002 91177308-0d34-0410-b5e6-96231b3b80d8
147 lines
5.4 KiB
C++
147 lines
5.4 KiB
C++
//===- RaiseAllocations.cpp - Convert %malloc & %free calls to insts ------===//
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//
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// This file defines the RaiseAllocations pass which convert malloc and free
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// calls to malloc and free instructions.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Transforms/Utils/BasicBlockUtils.h"
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#include "llvm/Module.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/iMemory.h"
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#include "llvm/iOther.h"
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#include "llvm/Pass.h"
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#include "Support/Statistic.h"
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namespace {
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Statistic<> NumRaised("raiseallocs", "Number of allocations raised");
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// RaiseAllocations - Turn %malloc and %free calls into the appropriate
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// instruction.
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//
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class RaiseAllocations : public BasicBlockPass {
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Function *MallocFunc; // Functions in the module we are processing
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Function *FreeFunc; // Initialized by doPassInitializationVirt
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public:
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RaiseAllocations() : MallocFunc(0), FreeFunc(0) {}
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// doPassInitialization - For the raise allocations pass, this finds a
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// declaration for malloc and free if they exist.
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//
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bool doInitialization(Module &M);
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// runOnBasicBlock - This method does the actual work of converting
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// instructions over, assuming that the pass has already been initialized.
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//
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bool runOnBasicBlock(BasicBlock &BB);
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};
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RegisterOpt<RaiseAllocations>
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X("raiseallocs", "Raise allocations from calls to instructions");
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} // end anonymous namespace
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// createRaiseAllocationsPass - The interface to this file...
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Pass *createRaiseAllocationsPass() {
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return new RaiseAllocations();
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}
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bool RaiseAllocations::doInitialization(Module &M) {
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// If the module has a symbol table, they might be referring to the malloc
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// and free functions. If this is the case, grab the method pointers that
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// the module is using.
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//
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// Lookup %malloc and %free in the symbol table, for later use. If they
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// don't exist, or are not external, we do not worry about converting calls
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// to that function into the appropriate instruction.
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//
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const FunctionType *MallocType = // Get the type for malloc
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FunctionType::get(PointerType::get(Type::SByteTy),
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std::vector<const Type*>(1, Type::ULongTy), false);
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const FunctionType *FreeType = // Get the type for free
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FunctionType::get(Type::VoidTy,
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std::vector<const Type*>(1, PointerType::get(Type::SByteTy)),
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false);
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// Get Malloc and free prototypes if they exist!
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MallocFunc = M.getFunction("malloc", MallocType);
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FreeFunc = M.getFunction("free" , FreeType);
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// Check to see if the prototype is wrong, giving us sbyte*(uint) * malloc
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// This handles the common declaration of: 'void *malloc(unsigned);'
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if (MallocFunc == 0) {
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MallocType = FunctionType::get(PointerType::get(Type::SByteTy),
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std::vector<const Type*>(1, Type::UIntTy), false);
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MallocFunc = M.getFunction("malloc", MallocType);
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}
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// Check to see if the prototype is missing, giving us sbyte*(...) * malloc
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// This handles the common declaration of: 'void *malloc();'
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if (MallocFunc == 0) {
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MallocType = FunctionType::get(PointerType::get(Type::SByteTy),
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std::vector<const Type*>(), true);
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MallocFunc = M.getFunction("malloc", MallocType);
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}
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// Check to see if the prototype was forgotten, giving us void (...) * free
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// This handles the common forward declaration of: 'void free();'
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if (FreeFunc == 0) {
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FreeType = FunctionType::get(Type::VoidTy, std::vector<const Type*>(),true);
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FreeFunc = M.getFunction("free", FreeType);
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}
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// Don't mess with locally defined versions of these functions...
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if (MallocFunc && !MallocFunc->isExternal()) MallocFunc = 0;
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if (FreeFunc && !FreeFunc->isExternal()) FreeFunc = 0;
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return false;
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}
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// runOnBasicBlock - Process a basic block, fixing it up...
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//
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bool RaiseAllocations::runOnBasicBlock(BasicBlock &BB) {
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bool Changed = false;
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BasicBlock::InstListType &BIL = BB.getInstList();
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for (BasicBlock::iterator BI = BB.begin(); BI != BB.end(); ++BI) {
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Instruction *I = BI;
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if (CallInst *CI = dyn_cast<CallInst>(I)) {
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if (CI->getCalledValue() == MallocFunc) { // Replace call to malloc?
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Value *Source = CI->getOperand(1);
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// If no prototype was provided for malloc, we may need to cast the
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// source size.
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if (Source->getType() != Type::UIntTy)
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Source = new CastInst(Source, Type::UIntTy, "MallocAmtCast", BI);
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std::string Name(CI->getName()); CI->setName("");
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BI = new MallocInst(Type::SByteTy, Source, Name, BI);
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CI->replaceAllUsesWith(BI);
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BIL.erase(I);
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Changed = true;
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++NumRaised;
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} else if (CI->getCalledValue() == FreeFunc) { // Replace call to free?
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// If no prototype was provided for free, we may need to cast the
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// source pointer. This should be really uncommon, but it's neccesary
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// just in case we are dealing with wierd code like this:
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// free((long)ptr);
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//
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Value *Source = CI->getOperand(1);
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if (!isa<PointerType>(Source->getType()))
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Source = new CastInst(Source, PointerType::get(Type::SByteTy),
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"FreePtrCast", BI);
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BI = new FreeInst(Source, BI);
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BIL.erase(I);
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Changed = true;
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++NumRaised;
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}
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}
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}
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return Changed;
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}
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