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-rw-r--r--include/llvm/Analysis/MemoryBuiltins.h4
-rw-r--r--lib/Analysis/MemoryBuiltins.cpp25
-rw-r--r--lib/Transforms/Instrumentation/BoundsChecking.cpp5
-rw-r--r--test/Instrumentation/BoundsChecking/strings.ll31
4 files changed, 56 insertions, 9 deletions
diff --git a/include/llvm/Analysis/MemoryBuiltins.h b/include/llvm/Analysis/MemoryBuiltins.h
index e674e74..7684082 100644
--- a/include/llvm/Analysis/MemoryBuiltins.h
+++ b/include/llvm/Analysis/MemoryBuiltins.h
@@ -201,6 +201,7 @@ class ObjectSizeOffsetEvaluator
typedef SmallPtrSet<const Value*, 8> PtrSetTy;
const TargetData *TD;
+ const TargetLibraryInfo *TLI;
LLVMContext &Context;
BuilderTy Builder;
ObjectSizeOffsetVisitor Visitor;
@@ -215,7 +216,8 @@ class ObjectSizeOffsetEvaluator
SizeOffsetEvalType compute_(Value *V);
public:
- ObjectSizeOffsetEvaluator(const TargetData *TD, LLVMContext &Context);
+ ObjectSizeOffsetEvaluator(const TargetData *TD, const TargetLibraryInfo *TLI,
+ LLVMContext &Context);
SizeOffsetEvalType compute(Value *V);
bool knownSize(SizeOffsetEvalType SizeOffset) {
diff --git a/lib/Analysis/MemoryBuiltins.cpp b/lib/Analysis/MemoryBuiltins.cpp
index 4833b52..2141778 100644
--- a/lib/Analysis/MemoryBuiltins.cpp
+++ b/lib/Analysis/MemoryBuiltins.cpp
@@ -26,6 +26,7 @@
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetData.h"
+#include "llvm/Transforms/Utils/BuildLibCalls.h"
#include "llvm/Transforms/Utils/Local.h"
using namespace llvm;
@@ -448,11 +449,9 @@ SizeOffsetType ObjectSizeOffsetVisitor::visitCallSite(CallSite CS) {
return std::make_pair(Size, Zero);
// TODO: handle more standard functions (+ wchar cousins):
- // - strdup / strndup
// - strcpy / strncpy
// - strcat / strncat
// - memcpy / memmove
- // - strcat / strncat
// - memset
}
@@ -524,8 +523,9 @@ SizeOffsetType ObjectSizeOffsetVisitor::visitInstruction(Instruction &I) {
ObjectSizeOffsetEvaluator::ObjectSizeOffsetEvaluator(const TargetData *TD,
+ const TargetLibraryInfo *TLI,
LLVMContext &Context)
-: TD(TD), Context(Context), Builder(Context, TargetFolder(TD)),
+: TD(TD), TLI(TLI), Context(Context), Builder(Context, TargetFolder(TD)),
Visitor(TD, Context) {
IntTy = TD->getIntPtrType(Context);
Zero = ConstantInt::get(IntTy, 0);
@@ -619,8 +619,21 @@ SizeOffsetEvalType ObjectSizeOffsetEvaluator::visitCallSite(CallSite CS) {
// handle strdup-like functions separately
if (FnData->AllocTy == StrDupLike) {
- // TODO
- return unknown();
+ IRBuilder<> StdBuilder(Builder.GetInsertPoint());
+ Value *Size;
+
+ // strdup(str): size = strlen(str)+1
+ if (FnData->FstParam < 0)
+ Size = EmitStrLen(CS.getArgument(0), StdBuilder, TD, TLI);
+ else
+ // strndup(str, maxlen): size = strnlen(str, maxlen)+1
+ Size = EmitStrNLen(CS.getArgument(0), CS.getArgument(FnData->FstParam),
+ StdBuilder, TD, TLI);
+ if (!Size)
+ return unknown();
+ Builder.SetInsertPoint(StdBuilder.GetInsertPoint());
+ Size = Builder.CreateNUWAdd(Size, ConstantInt::get(IntTy, 1));
+ return std::make_pair(Size, Zero);
}
Value *FirstArg = CS.getArgument(FnData->FstParam);
@@ -634,11 +647,9 @@ SizeOffsetEvalType ObjectSizeOffsetEvaluator::visitCallSite(CallSite CS) {
return std::make_pair(Size, Zero);
// TODO: handle more standard functions (+ wchar cousins):
- // - strdup / strndup
// - strcpy / strncpy
// - strcat / strncat
// - memcpy / memmove
- // - strcat / strncat
// - memset
}
diff --git a/lib/Transforms/Instrumentation/BoundsChecking.cpp b/lib/Transforms/Instrumentation/BoundsChecking.cpp
index 09e0f14..b209fff 100644
--- a/lib/Transforms/Instrumentation/BoundsChecking.cpp
+++ b/lib/Transforms/Instrumentation/BoundsChecking.cpp
@@ -24,6 +24,7 @@
#include "llvm/Support/TargetFolder.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetLibraryInfo.h"
#include "llvm/Transforms/Instrumentation.h"
using namespace llvm;
@@ -48,6 +49,7 @@ namespace {
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<TargetData>();
+ AU.addRequired<TargetLibraryInfo>();
}
private:
@@ -166,11 +168,12 @@ bool BoundsChecking::instrument(Value *Ptr, Value *InstVal) {
bool BoundsChecking::runOnFunction(Function &F) {
TD = &getAnalysis<TargetData>();
+ const TargetLibraryInfo *TLI = &getAnalysis<TargetLibraryInfo>();
TrapBB = 0;
BuilderTy TheBuilder(F.getContext(), TargetFolder(TD));
Builder = &TheBuilder;
- ObjectSizeOffsetEvaluator TheObjSizeEval(TD, F.getContext());
+ ObjectSizeOffsetEvaluator TheObjSizeEval(TD, TLI, F.getContext());
ObjSizeEval = &TheObjSizeEval;
// check HANDLE_MEMORY_INST in include/llvm/Instruction.def for memory
diff --git a/test/Instrumentation/BoundsChecking/strings.ll b/test/Instrumentation/BoundsChecking/strings.ll
new file mode 100644
index 0000000..1942d14
--- /dev/null
+++ b/test/Instrumentation/BoundsChecking/strings.ll
@@ -0,0 +1,31 @@
+; RUN: opt < %s -bounds-checking -S | FileCheck %s
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+
+declare noalias i8* @strdup(i8* nocapture) nounwind
+declare noalias i8* @strndup(i8* nocapture, i64) nounwind
+
+; CHECK: @f1
+define i8 @f1(i8* nocapture %str, i8** nocapture %esc) nounwind uwtable ssp {
+; CHECK: call i64 @strlen(i8* %str)
+; CHECK-NEXT: %1 = add nuw i64 {{.*}}, 1
+ %call = tail call i8* @strdup(i8* %str) nounwind
+ store i8* %call, i8** %esc, align 8
+ %arrayidx = getelementptr inbounds i8* %call, i64 3
+; CHECK: sub i64 %1, 3
+ %1 = load i8* %arrayidx, align 1
+ ret i8 %1
+; CHECK: call void @llvm.trap
+}
+
+; CHECK: @f2
+define i8 @f2(i8* nocapture %str, i8** nocapture %esc, i64 %limit) nounwind uwtable ssp {
+; CHECK: call i64 @strnlen(i8* %str, i64 %limit)
+; CHECK-NEXT: %1 = add nuw i64 {{.*}}, 1
+ %call = tail call i8* @strndup(i8* %str, i64 %limit) nounwind
+ store i8* %call, i8** %esc, align 8
+ %arrayidx = getelementptr inbounds i8* %call, i64 3
+; CHECK: sub i64 %1, 3
+ %1 = load i8* %arrayidx, align 1
+ ret i8 %1
+; CHECK: call void @llvm.trap
+}
generated by cgit v1.1 at 2025-01-09 20:07:08 +0000