mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-19 19:29:31 +00:00
f57b845547
- Rename runOnMethod to runOnFunction
* Transform getAnalysisUsageInfo into getAnalysisUsage
- Method is now const
- It now takes one AnalysisUsage object to fill in instead of 3 vectors
to fill in
- Pass's now specify which other passes they _preserve_ not which ones
they modify (be conservative!)
- A pass can specify that it preserves all analyses (because it never
modifies the underlying program)
* s/Method/Function/g in other random places as well
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2333 91177308-0d34-0410-b5e6-96231b3b80d8
98 lines
3.2 KiB
C++
98 lines
3.2 KiB
C++
//===- FindUnsafePointerTypes.cpp - Check pointer usage safety --------------=//
|
|
//
|
|
// This file defines a pass that can be used to determine, interprocedurally,
|
|
// which pointer types are accessed unsafely in a program. If there is an
|
|
// "unsafe" access to a specific pointer type, transformations that depend on
|
|
// type safety cannot be permitted.
|
|
//
|
|
// The result of running this analysis over a program is a set of unsafe pointer
|
|
// types that cannot be transformed. Safe pointer types are not tracked.
|
|
//
|
|
// Additionally, this analysis exports a hidden command line argument that (when
|
|
// enabled) prints out the reasons a type was determined to be unsafe.
|
|
//
|
|
// Currently, the only allowed operations on pointer types are:
|
|
// alloca, malloc, free, getelementptr, load, and store
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Analysis/FindUnsafePointerTypes.h"
|
|
#include "llvm/Assembly/CachedWriter.h"
|
|
#include "llvm/Type.h"
|
|
#include "llvm/Instruction.h"
|
|
#include "llvm/Function.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/Support/InstIterator.h"
|
|
#include "Support/CommandLine.h"
|
|
|
|
AnalysisID FindUnsafePointerTypes::ID(AnalysisID::create<FindUnsafePointerTypes>());
|
|
|
|
// Provide a command line option to turn on printing of which instructions cause
|
|
// a type to become invalid
|
|
//
|
|
static cl::Flag
|
|
PrintFailures("printunsafeptrinst", "Print Unsafe Pointer Access Instructions",
|
|
cl::Hidden, false);
|
|
|
|
static inline bool isSafeInstruction(const Instruction *I) {
|
|
switch (I->getOpcode()) {
|
|
case Instruction::Alloca:
|
|
case Instruction::Malloc:
|
|
case Instruction::Free:
|
|
case Instruction::Load:
|
|
case Instruction::Store:
|
|
case Instruction::GetElementPtr:
|
|
case Instruction::Call:
|
|
case Instruction::Invoke:
|
|
case Instruction::PHINode:
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
bool FindUnsafePointerTypes::run(Module *Mod) {
|
|
for (Module::iterator MI = Mod->begin(), ME = Mod->end();
|
|
MI != ME; ++MI) {
|
|
const Function *M = *MI; // We don't need/want write access
|
|
for (const_inst_iterator I = inst_begin(M), E = inst_end(M); I != E; ++I) {
|
|
const Instruction *Inst = *I;
|
|
const Type *ITy = Inst->getType();
|
|
if (ITy->isPointerType() && !UnsafeTypes.count((PointerType*)ITy))
|
|
if (!isSafeInstruction(Inst)) {
|
|
UnsafeTypes.insert((PointerType*)ITy);
|
|
|
|
if (PrintFailures) {
|
|
CachedWriter CW(M->getParent(), std::cerr);
|
|
CW << "FindUnsafePointerTypes: Type '" << ITy
|
|
<< "' marked unsafe in '" << M->getName() << "' by:\n" << Inst;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
// printResults - Loop over the results of the analysis, printing out unsafe
|
|
// types.
|
|
//
|
|
void FindUnsafePointerTypes::printResults(const Module *M,
|
|
std::ostream &o) const {
|
|
if (UnsafeTypes.empty()) {
|
|
o << "SafePointerAccess Analysis: No unsafe types found!\n";
|
|
return;
|
|
}
|
|
|
|
CachedWriter CW(M, o);
|
|
|
|
CW << "SafePointerAccess Analysis: Found these unsafe types:\n";
|
|
unsigned Counter = 1;
|
|
for (std::set<PointerType*>::const_iterator I = getUnsafeTypes().begin(),
|
|
E = getUnsafeTypes().end(); I != E; ++I, ++Counter) {
|
|
|
|
CW << " #" << Counter << ". " << (Value*)*I << "\n";
|
|
}
|
|
}
|