[llvm-commits] [llvm] r46045 - in /llvm/trunk: lib/Transforms/IPO/StripSymbols.cpp test/Transforms/StripSymbols/ test/Transforms/StripSymbols/2007-01-15-llvm.used.ll test/Transforms/StripSymbols/Output/ test/Transforms/StripSymbols/dg.exp

[Devang Patel]

Author: dpatel
Date: Tue Jan 15 21:33:05 2008
New Revision: 46045

URL: http://llvm.org/viewvc/llvm-project?rev=46045&view=rev
Log:
Do not strip llvm.used values.

Added:
    llvm/trunk/test/Transforms/StripSymbols/
    llvm/trunk/test/Transforms/StripSymbols/2007-01-15-llvm.used.ll
    llvm/trunk/test/Transforms/StripSymbols/Output/
    llvm/trunk/test/Transforms/StripSymbols/dg.exp
Modified:
    llvm/trunk/lib/Transforms/IPO/StripSymbols.cpp

Modified: llvm/trunk/lib/Transforms/IPO/StripSymbols.cpp
URL: 
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/IPO/StripSymbols.cpp?rev=46045&r1=46044&r2=46045&view=diff

==============================================================================
--- llvm/trunk/lib/Transforms/IPO/StripSymbols.cpp (original)
+++ llvm/trunk/lib/Transforms/IPO/StripSymbols.cpp Tue Jan 15 21:33:05 2008
@@ -29,6 +29,7 @@
 #include "llvm/ValueSymbolTable.h"
 #include "llvm/TypeSymbolTable.h"
 #include "llvm/Support/Compiler.h"
+#include "llvm/ADT/SmallPtrSet.h"
 using namespace llvm;
 
 namespace {
@@ -100,13 +101,34 @@
   // If we're not just stripping debug info, strip all symbols from the
   // functions and the names from any internal globals.
   if (!OnlyDebugInfo) {
+    SmallPtrSet<const Constant *, 8> llvmUsedValues;
+    Value *LLVMUsed = M.getValueSymbolTable().lookup("llvm.used");
+    if (LLVMUsed) {
+      // Collect values that are preserved as per explicit request.
+      // llvm.used is used to list these values.
+      if (GlobalVariable *GV = dyn_cast<GlobalVariable>(LLVMUsed)) {
+        if (ConstantArray *InitList = 
+            dyn_cast<ConstantArray>(GV->getInitializer())) {
+          for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
+            if (ConstantExpr *CE = 
+                dyn_cast<ConstantExpr>(InitList->getOperand(i)))
+              if (CE->isCast())
+                llvmUsedValues.insert(CE->getOperand(0));
+          }
+        }
+      }
+    }
+
     for (Module::global_iterator I = M.global_begin(), E = M.global_end();
-         I != E; ++I)
-      if (I->hasInternalLinkage())
+         I != E; ++I) {
+      if (I->hasInternalLinkage() && llvmUsedValues.count(I) == 0)
         I->setName("");     // Internal symbols can't participate in linkage
+      else if (I->getName() == "llvm.used") {
+      }
+    }
 
     for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
-      if (I->hasInternalLinkage())
+      if (I->hasInternalLinkage() && llvmUsedValues.count(I) == 0)
         I->setName("");     // Internal symbols can't participate in linkage
       StripSymtab(I->getValueSymbolTable());
     }

Added: llvm/trunk/test/Transforms/StripSymbols/2007-01-15-llvm.used.ll
URL: 
http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/StripSymbols/2007-01-15-llvm.used.ll?rev=46045&view=auto

==============================================================================
--- llvm/trunk/test/Transforms/StripSymbols/2007-01-15-llvm.used.ll (added)
+++ llvm/trunk/test/Transforms/StripSymbols/2007-01-15-llvm.used.ll Tue Jan 15 
21:33:05 2008
@@ -0,0 +1,15 @@
+; RUN: llvm-as < %s | opt -strip | llvm-dis | grep foo | count 2
+; RUN: llvm-as < %s | opt -strip | llvm-dis | grep bar | count 2
[EMAIL PROTECTED] = appending global [2 x i8*] [ i8* bitcast (i32* @foo to 
i8*), i8* bitcast (i32 ()* @bar to i8*) ], section "llvm.metadata"           ; 
<[2 x i8*]*> [#uses=0]
[EMAIL PROTECTED] = internal constant i32 41            ; <i32*> [#uses=1]
+
+define internal i32 @bar() nounwind  {
+entry:
+       ret i32 42
+}
+
+define i32 @main() nounwind  {
+entry:
+       ret i32 0
+}
+

Added: llvm/trunk/test/Transforms/StripSymbols/dg.exp
URL: 
http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/StripSymbols/dg.exp?rev=46045&view=auto

==============================================================================
--- llvm/trunk/test/Transforms/StripSymbols/dg.exp (added)
+++ llvm/trunk/test/Transforms/StripSymbols/dg.exp Tue Jan 15 21:33:05 2008
@@ -0,0 +1,3 @@
+load_lib llvm.exp
+
+RunLLVMTests [lsort [glob -nocomplain $srcdir/$subdir/*.{ll,llx,c,cpp,tr}]]


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