[asan] Disable checking of arguments passed by value for --asan-force-dynamic-shadow

Fails with "Instruction does not dominate all uses!"

llvm-svn: 310241

diff --git a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
index 057f746..d437ae9 100644 (file)
--- a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -756,7 +756,8 @@ struct FunctionStackPoisoner : public InstVisitor<FunctionStackPoisoner> {
   bool runOnFunction() {
     if (!ClStack) return false;
 
-    if (ClRedzoneByvalArgs) copyArgsPassedByValToAllocas();
+    if (ClRedzoneByvalArgs && !ClForceDynamicShadow)
+      copyArgsPassedByValToAllocas();
 
     // Collect alloca, ret, lifetime instructions etc.
     for (BasicBlock *BB : depth_first(&F.getEntryBlock())) visit(*BB);

diff --git a/llvm/test/Instrumentation/AddressSanitizer/stack-poisoning-byval-args.ll b/llvm/test/Instrumentation/AddressSanitizer/stack-poisoning-byval-args.ll
index 32610ce..8531cb9 100644 (file)
--- a/llvm/test/Instrumentation/AddressSanitizer/stack-poisoning-byval-args.ll
+++ b/llvm/test/Instrumentation/AddressSanitizer/stack-poisoning-byval-args.ll
@@ -1,5 +1,7 @@
 ; This check verifies that arguments passed by value get redzones.
 ; RUN: opt < %s -asan -asan-realign-stack=32 -S | FileCheck %s
+; RUN: opt < %s -asan -asan-realign-stack=32 -asan-force-dynamic-shadow -S | FileCheck %s --check-prefixes=CHECK-FDS
+
 
 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"
 target triple = "x86_64-unknown-linux-gnu"
@@ -8,6 +10,8 @@ target triple = "x86_64-unknown-linux-gnu"
 
 declare i32 @bar(%struct.A*)
 
+; CHECK-FDS-NOT: {{\.byval}}
+
 ; Test behavior for named argument with explicit alignment.  The memcpy and
 ; alloca alignments should match the explicit alignment of 64.
 define void @foo(%struct.A* byval align 64 %a) sanitize_address {