https://github.com/gbMattN updated
https://github.com/llvm/llvm-project/pull/119387
>From 8781ff2355750ae61d140620b1f6862537de07e3 Mon Sep 17 00:00:00 2001
From: gbMattN <matthew.n...@sony.com>
Date: Tue, 10 Dec 2024 15:01:37 +0000
Subject: [PATCH 1/3] [ASan] Add metadata to renamed instructions so ASan
doesn't use the incorrect name
---
llvm/lib/IR/ValueSymbolTable.cpp | 8 ++++++++
llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp | 7 ++++++-
2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/llvm/lib/IR/ValueSymbolTable.cpp b/llvm/lib/IR/ValueSymbolTable.cpp
index a020acf22a96c5..81bb3f3c5a5e35 100644
--- a/llvm/lib/IR/ValueSymbolTable.cpp
+++ b/llvm/lib/IR/ValueSymbolTable.cpp
@@ -123,6 +123,14 @@ ValueName *ValueSymbolTable::createValueName(StringRef
Name, Value *V) {
}
// Otherwise, there is a naming conflict. Rename this value.
+ // If we are renaming an instruction, ASan needs to know for it to serialize
+ // properly
+ if (auto *I = dyn_cast<Instruction>(V)) {
+ MDString *trueNameMetadata = MDString::get(V->getContext(), Name);
+ llvm::MDTuple *tuple =
+ llvm::MDTuple::get(V->getContext(), trueNameMetadata);
+ I->setMetadata("OriginalName", tuple);
+ }
SmallString<256> UniqueName(Name.begin(), Name.end());
return makeUniqueName(V, UniqueName);
}
diff --git a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
index cb84588318496c..c696cc38167cd4 100644
--- a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -3430,7 +3430,12 @@ void FunctionStackPoisoner::processStaticAllocas() {
SmallVector<ASanStackVariableDescription, 16> SVD;
SVD.reserve(AllocaVec.size());
for (AllocaInst *AI : AllocaVec) {
- ASanStackVariableDescription D = {AI->getName().data(),
+ std::string Name = AI->getName().data();
+ if (AI->hasMetadata("OriginalName")) {
+ MDTuple *tuple = dyn_cast<MDTuple>(AI->getMetadata("OriginalName"));
+ Name = dyn_cast<MDString>(tuple->getOperand(0))->getString();
+ }
+ ASanStackVariableDescription D = {Name.c_str(),
ASan.getAllocaSizeInBytes(*AI),
0,
AI->getAlign().value(),
>From 25efafa3d67afb6a9107fdd502f5f6e4f40c311c Mon Sep 17 00:00:00 2001
From: gbMattN <matthew.n...@sony.com>
Date: Wed, 11 Dec 2024 11:44:01 +0000
Subject: [PATCH 2/3] [bugfix] Fixed string pointer being used out of scope
---
llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
index c696cc38167cd4..2051fa94678175 100644
--- a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -3430,12 +3430,12 @@ void FunctionStackPoisoner::processStaticAllocas() {
SmallVector<ASanStackVariableDescription, 16> SVD;
SVD.reserve(AllocaVec.size());
for (AllocaInst *AI : AllocaVec) {
- std::string Name = AI->getName().data();
+ const char* Name = AI->getName().data();
if (AI->hasMetadata("OriginalName")) {
MDTuple *tuple = dyn_cast<MDTuple>(AI->getMetadata("OriginalName"));
- Name = dyn_cast<MDString>(tuple->getOperand(0))->getString();
+ Name = dyn_cast<MDString>(tuple->getOperand(0))->getString().data();
}
- ASanStackVariableDescription D = {Name.c_str(),
+ ASanStackVariableDescription D = {Name,
ASan.getAllocaSizeInBytes(*AI),
0,
AI->getAlign().value(),
>From 40db9bdb410d4c77cb78ed7269aabd8a7cb2a95f Mon Sep 17 00:00:00 2001
From: gbMattN <matthew.n...@sony.com>
Date: Tue, 17 Dec 2024 16:47:11 +0000
Subject: [PATCH 3/3] Now only emit metadata when using a ASan, and tag it with
an enum rather than a string
---
clang/lib/CodeGen/CGExpr.cpp | 8 ++++++++
llvm/include/llvm/IR/FixedMetadataKinds.def | 1 +
llvm/lib/IR/ValueSymbolTable.cpp | 10 ----------
.../Transforms/Instrumentation/AddressSanitizer.cpp | 4 ++--
4 files changed, 11 insertions(+), 12 deletions(-)
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index 5fccc9cbb37ec1..d8fdacf30e12e3 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -137,6 +137,14 @@ llvm::AllocaInst
*CodeGenFunction::CreateTempAlloca(llvm::Type *Ty,
Alloca =
new llvm::AllocaInst(Ty, CGM.getDataLayout().getAllocaAddrSpace(),
ArraySize, Name, AllocaInsertPt->getIterator());
+ if (Alloca->getName() != Name.str() &&
+ SanOpts.Mask & SanitizerKind::Address) {
+
+ llvm::LLVMContext &ctx = Alloca->getContext();
+ llvm::MDString *trueNameMetadata = llvm::MDString::get(ctx, Name.str());
+ llvm::MDTuple *tuple = llvm::MDTuple::get(ctx, trueNameMetadata);
+ Alloca->setMetadata(llvm::LLVMContext::MD_unaltered_name, tuple);
+ }
if (Allocas) {
Allocas->Add(Alloca);
}
diff --git a/llvm/include/llvm/IR/FixedMetadataKinds.def
b/llvm/include/llvm/IR/FixedMetadataKinds.def
index df572e8791e13b..41fa34bf09ff65 100644
--- a/llvm/include/llvm/IR/FixedMetadataKinds.def
+++ b/llvm/include/llvm/IR/FixedMetadataKinds.def
@@ -53,3 +53,4 @@ LLVM_FIXED_MD_KIND(MD_DIAssignID, "DIAssignID", 38)
LLVM_FIXED_MD_KIND(MD_coro_outside_frame, "coro.outside.frame", 39)
LLVM_FIXED_MD_KIND(MD_mmra, "mmra", 40)
LLVM_FIXED_MD_KIND(MD_noalias_addrspace, "noalias.addrspace", 41)
+LLVM_FIXED_MD_KIND(MD_unaltered_name, "unaltered.name", 42)
diff --git a/llvm/lib/IR/ValueSymbolTable.cpp b/llvm/lib/IR/ValueSymbolTable.cpp
index 81bb3f3c5a5e35..06867b574a2072 100644
--- a/llvm/lib/IR/ValueSymbolTable.cpp
+++ b/llvm/lib/IR/ValueSymbolTable.cpp
@@ -121,16 +121,6 @@ ValueName *ValueSymbolTable::createValueName(StringRef
Name, Value *V) {
// << *V << "\n");
return &*IterBool.first;
}
-
- // Otherwise, there is a naming conflict. Rename this value.
- // If we are renaming an instruction, ASan needs to know for it to serialize
- // properly
- if (auto *I = dyn_cast<Instruction>(V)) {
- MDString *trueNameMetadata = MDString::get(V->getContext(), Name);
- llvm::MDTuple *tuple =
- llvm::MDTuple::get(V->getContext(), trueNameMetadata);
- I->setMetadata("OriginalName", tuple);
- }
SmallString<256> UniqueName(Name.begin(), Name.end());
return makeUniqueName(V, UniqueName);
}
diff --git a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
index 2051fa94678175..8d8d7397f6ddfd 100644
--- a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -3431,8 +3431,8 @@ void FunctionStackPoisoner::processStaticAllocas() {
SVD.reserve(AllocaVec.size());
for (AllocaInst *AI : AllocaVec) {
const char* Name = AI->getName().data();
- if (AI->hasMetadata("OriginalName")) {
- MDTuple *tuple = dyn_cast<MDTuple>(AI->getMetadata("OriginalName"));
+ if (AI->hasMetadata(LLVMContext::MD_unaltered_name)) {
+ MDTuple *tuple =
dyn_cast<MDTuple>(AI->getMetadata(LLVMContext::MD_unaltered_name));
Name = dyn_cast<MDString>(tuple->getOperand(0))->getString().data();
}
ASanStackVariableDescription D = {Name,
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