It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/IPO/StripSymbols.cpp b/lib/Transforms/IPO/StripSymbols.cpp
new file mode 100644
index 0000000..c8f8926
--- /dev/null
+++ b/lib/Transforms/IPO/StripSymbols.cpp
@@ -0,0 +1,206 @@
+//===- StripSymbols.cpp - Strip symbols and debug info from a module ------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements stripping symbols out of symbol tables.
+//
+// Specifically, this allows you to strip all of the symbols out of:
+// * All functions in a module
+// * All non-essential symbols in a module (all function symbols + all module
+// scope symbols)
+// * Debug information.
+//
+// Notice that:
+// * This pass makes code much less readable, so it should only be used in
+// situations where the 'strip' utility would be used (such as reducing
+// code size, and making it harder to reverse engineer code).
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Transforms/IPO.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Instructions.h"
+#include "llvm/Module.h"
+#include "llvm/Pass.h"
+#include "llvm/ValueSymbolTable.h"
+#include "llvm/TypeSymbolTable.h"
+#include "llvm/Support/Compiler.h"
+using namespace llvm;
+
+namespace {
+ class VISIBILITY_HIDDEN StripSymbols : public ModulePass {
+ bool OnlyDebugInfo;
+ public:
+ static char ID; // Pass identification, replacement for typeid
+ StripSymbols(bool ODI = false)
+ : ModulePass((intptr_t)&ID), OnlyDebugInfo(ODI) {}
+
+ virtual bool runOnModule(Module &M);
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesAll();
+ }
+ };
+
+ char StripSymbols::ID = 0;
+ RegisterPass<StripSymbols> X("strip", "Strip all symbols from a module");
+}
+
+ModulePass *llvm::createStripSymbolsPass(bool OnlyDebugInfo) {
+ return new StripSymbols(OnlyDebugInfo);
+}
+
+static void RemoveDeadConstant(Constant *C) {
+ assert(C->use_empty() && "Constant is not dead!");
+ std::vector<Constant*> Operands;
+ for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
+ if (isa<DerivedType>(C->getOperand(i)->getType()) &&
+ C->getOperand(i)->hasOneUse())
+ Operands.push_back(C->getOperand(i));
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
+ if (!GV->hasInternalLinkage()) return; // Don't delete non static globals.
+ GV->eraseFromParent();
+ }
+ else if (!isa<Function>(C))
+ C->destroyConstant();
+
+ // If the constant referenced anything, see if we can delete it as well.
+ while (!Operands.empty()) {
+ RemoveDeadConstant(Operands.back());
+ Operands.pop_back();
+ }
+}
+
+// Strip the symbol table of its names.
+//
+static void StripSymtab(ValueSymbolTable &ST) {
+ for (ValueSymbolTable::iterator VI = ST.begin(), VE = ST.end(); VI != VE; ) {
+ Value *V = VI->getValue();
+ ++VI;
+ if (!isa<GlobalValue>(V) || cast<GlobalValue>(V)->hasInternalLinkage()) {
+ // Set name to "", removing from symbol table!
+ V->setName("");
+ }
+ }
+}
+
+// Strip the symbol table of its names.
+static void StripTypeSymtab(TypeSymbolTable &ST) {
+ for (TypeSymbolTable::iterator TI = ST.begin(), E = ST.end(); TI != E; )
+ ST.remove(TI++);
+}
+
+
+
+bool StripSymbols::runOnModule(Module &M) {
+ // If we're not just stripping debug info, strip all symbols from the
+ // functions and the names from any internal globals.
+ if (!OnlyDebugInfo) {
+ for (Module::global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I)
+ if (I->hasInternalLinkage())
+ I->setName(""); // Internal symbols can't participate in linkage
+
+ for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
+ if (I->hasInternalLinkage())
+ I->setName(""); // Internal symbols can't participate in linkage
+ StripSymtab(I->getValueSymbolTable());
+ }
+
+ // Remove all names from types.
+ StripTypeSymtab(M.getTypeSymbolTable());
+ }
+
+ // Strip debug info in the module if it exists. To do this, we remove
+ // llvm.dbg.func.start, llvm.dbg.stoppoint, and llvm.dbg.region.end calls, and
+ // any globals they point to if now dead.
+ Function *FuncStart = M.getFunction("llvm.dbg.func.start");
+ Function *StopPoint = M.getFunction("llvm.dbg.stoppoint");
+ Function *RegionStart = M.getFunction("llvm.dbg.region.start");
+ Function *RegionEnd = M.getFunction("llvm.dbg.region.end");
+ Function *Declare = M.getFunction("llvm.dbg.declare");
+ if (!FuncStart && !StopPoint && !RegionStart && !RegionEnd && !Declare)
+ return true;
+
+ std::vector<GlobalVariable*> DeadGlobals;
+
+ // Remove all of the calls to the debugger intrinsics, and remove them from
+ // the module.
+ if (FuncStart) {
+ while (!FuncStart->use_empty()) {
+ CallInst *CI = cast<CallInst>(FuncStart->use_back());
+ Value *Arg = CI->getOperand(1);
+ assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
+ CI->eraseFromParent();
+ if (Arg->use_empty())
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Arg))
+ DeadGlobals.push_back(GV);
+ }
+ FuncStart->eraseFromParent();
+ }
+ if (StopPoint) {
+ while (!StopPoint->use_empty()) {
+ CallInst *CI = cast<CallInst>(StopPoint->use_back());
+ Value *Arg = CI->getOperand(3);
+ assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
+ CI->eraseFromParent();
+ if (Arg->use_empty())
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Arg))
+ DeadGlobals.push_back(GV);
+ }
+ StopPoint->eraseFromParent();
+ }
+ if (RegionStart) {
+ while (!RegionStart->use_empty()) {
+ CallInst *CI = cast<CallInst>(RegionStart->use_back());
+ Value *Arg = CI->getOperand(1);
+ assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
+ CI->eraseFromParent();
+ if (Arg->use_empty())
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Arg))
+ DeadGlobals.push_back(GV);
+ }
+ RegionStart->eraseFromParent();
+ }
+ if (RegionEnd) {
+ while (!RegionEnd->use_empty()) {
+ CallInst *CI = cast<CallInst>(RegionEnd->use_back());
+ Value *Arg = CI->getOperand(1);
+ assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
+ CI->eraseFromParent();
+ if (Arg->use_empty())
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Arg))
+ DeadGlobals.push_back(GV);
+ }
+ RegionEnd->eraseFromParent();
+ }
+ if (Declare) {
+ while (!Declare->use_empty()) {
+ CallInst *CI = cast<CallInst>(Declare->use_back());
+ Value *Arg = CI->getOperand(2);
+ assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
+ CI->eraseFromParent();
+ if (Arg->use_empty())
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Arg))
+ DeadGlobals.push_back(GV);
+ }
+ Declare->eraseFromParent();
+ }
+
+ // Finally, delete any internal globals that were only used by the debugger
+ // intrinsics.
+ while (!DeadGlobals.empty()) {
+ GlobalVariable *GV = DeadGlobals.back();
+ DeadGlobals.pop_back();
+ if (GV->hasInternalLinkage())
+ RemoveDeadConstant(GV);
+ }
+
+ return true;
+}