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#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Regex.h"
using namespace llvm;
//#define passLog(M) (errs() << "WeakAliasModuleOverride: " << M << "\n")
#define passLog(M) /* nothing */
namespace {
class WeakAliasModuleOverride : public ModulePass {
public:
static char ID;
WeakAliasModuleOverride() : ModulePass(ID) {
}
virtual bool runOnModule(Module &M) {
const Module::FunctionListType &listFcts = M.getFunctionList();
const Module::GlobalListType &listGlobalVars = M.getGlobalList();
std::string Asm = M.getModuleInlineAsm();
passLog("ASM START\n"
<< Asm
<< "ASM END\n");
// Filter out Function symbols
for(Module::const_iterator it = listFcts.begin(), end=listFcts.end(); it!= end; ++it)
{
if (it->isDeclaration())
continue;
// Filter out the assembly weak symbol as well as its default value
std::string symbolName = it->getName();
std::string matchWeak = "(^.weak.* " + symbolName + "\n)";
std::string matchAssignement = "(^" + symbolName + " .*=.*\n)";
Regex filterWeak(matchWeak, Regex::Newline);
Regex filterAssignement(matchAssignement, Regex::Newline);
while(filterWeak.match(Asm))
Asm = filterWeak.sub("", Asm);
while(filterAssignement.match(Asm))
Asm = filterAssignement.sub("", Asm);
}
// Filter out GlobalVariable symbols
for(Module::const_global_iterator it = listGlobalVars.begin(), end=listGlobalVars.end(); it!= end; ++it)
{
if (! it->hasInitializer())
continue;
// Filter out the assembly weak symbol as well as its default value
std::string symbolName = it->getName();
std::string matchWeak = "(^.weak.* " + symbolName + "\n)";
std::string matchAssignement = "(^" + symbolName + " .*=.*\n)";
Regex filterWeak(matchWeak, Regex::Newline);
Regex filterAssignement(matchAssignement, Regex::Newline);
while(filterWeak.match(Asm))
Asm = filterWeak.sub("", Asm);
while(filterAssignement.match(Asm))
Asm = filterAssignement.sub("", Asm);
}
M.setModuleInlineAsm(Asm);
passLog("ASM START - registered\n"
<< M.getModuleInlineAsm()
<< "ASM END\n");
return true;
}
};
}
char WeakAliasModuleOverride::ID = 0;
RegisterPass<WeakAliasModuleOverride> WEAK_ALIAS_MODULE_OVERRIDE("weak-alias-module-override", "Fix Weak Alias overrides");
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