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[clang][bytecode][NFC] Only get expr when checking for UB #125397

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Merged
merged 1 commit into from
Feb 2, 2025

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@tbaederr tbaederr commented Feb 2, 2025

The Expr and its Type were unused otherwise.

The Expr and its Type were unused otherwise.
@llvmbot llvmbot added clang Clang issues not falling into any other category clang:frontend Language frontend issues, e.g. anything involving "Sema" labels Feb 2, 2025
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llvmbot commented Feb 2, 2025

@llvm/pr-subscribers-clang

Author: Timm Baeder (tbaederr)

Changes

The Expr and its Type were unused otherwise.


Full diff: https://github.com/llvm/llvm-project/pull/125397.diff

1 Files Affected:

  • (modified) clang/lib/AST/ByteCode/Interp.h (+9-13)
diff --git a/clang/lib/AST/ByteCode/Interp.h b/clang/lib/AST/ByteCode/Interp.h
index 2a39e3932077f57..9f029adc7083908 100644
--- a/clang/lib/AST/ByteCode/Interp.h
+++ b/clang/lib/AST/ByteCode/Interp.h
@@ -379,15 +379,14 @@ bool AddSubMulHelper(InterpState &S, CodePtr OpPC, unsigned Bits, const T &LHS,
   APSInt Value = OpAP<APSInt>()(LHS.toAPSInt(Bits), RHS.toAPSInt(Bits));
 
   // Report undefined behaviour, stopping if required.
-  const Expr *E = S.Current->getExpr(OpPC);
-  QualType Type = E->getType();
   if (S.checkingForUndefinedBehavior()) {
+    const Expr *E = S.Current->getExpr(OpPC);
+    QualType Type = E->getType();
     SmallString<32> Trunc;
     Value.trunc(Result.bitWidth())
         .toString(Trunc, 10, Result.isSigned(), /*formatAsCLiteral=*/false,
                   /*UpperCase=*/true, /*InsertSeparators=*/true);
-    auto Loc = E->getExprLoc();
-    S.report(Loc, diag::warn_integer_constant_overflow)
+    S.report(E->getExprLoc(), diag::warn_integer_constant_overflow)
         << Trunc << Type << E->getSourceRange();
   }
 
@@ -737,16 +736,14 @@ bool Neg(InterpState &S, CodePtr OpPC) {
   S.Stk.push<T>(Result);
 
   APSInt NegatedValue = -Value.toAPSInt(Value.bitWidth() + 1);
-  const Expr *E = S.Current->getExpr(OpPC);
-  QualType Type = E->getType();
-
   if (S.checkingForUndefinedBehavior()) {
+    const Expr *E = S.Current->getExpr(OpPC);
+    QualType Type = E->getType();
     SmallString<32> Trunc;
     NegatedValue.trunc(Result.bitWidth())
         .toString(Trunc, 10, Result.isSigned(), /*formatAsCLiteral=*/false,
                   /*UpperCase=*/true, /*InsertSeparators=*/true);
-    auto Loc = E->getExprLoc();
-    S.report(Loc, diag::warn_integer_constant_overflow)
+    S.report(E->getExprLoc(), diag::warn_integer_constant_overflow)
         << Trunc << Type << E->getSourceRange();
     return true;
   }
@@ -800,15 +797,14 @@ bool IncDecHelper(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
     APResult = --Value.toAPSInt(Bits);
 
   // Report undefined behaviour, stopping if required.
-  const Expr *E = S.Current->getExpr(OpPC);
-  QualType Type = E->getType();
   if (S.checkingForUndefinedBehavior()) {
+    const Expr *E = S.Current->getExpr(OpPC);
+    QualType Type = E->getType();
     SmallString<32> Trunc;
     APResult.trunc(Result.bitWidth())
         .toString(Trunc, 10, Result.isSigned(), /*formatAsCLiteral=*/false,
                   /*UpperCase=*/true, /*InsertSeparators=*/true);
-    auto Loc = E->getExprLoc();
-    S.report(Loc, diag::warn_integer_constant_overflow)
+    S.report(E->getExprLoc(), diag::warn_integer_constant_overflow)
         << Trunc << Type << E->getSourceRange();
     return true;
   }

@tbaederr tbaederr merged commit 642e84f into llvm:main Feb 2, 2025
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llvm-ci commented Feb 2, 2025

LLVM Buildbot has detected a new failure on builder openmp-offload-libc-amdgpu-runtime running on omp-vega20-1 while building clang at step 7 "Add check check-offload".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/73/builds/12884

Here is the relevant piece of the build log for the reference
Step 7 (Add check check-offload) failure: test (failure)
******************** TEST 'libomptarget :: amdgcn-amd-amdhsa :: mapping/data_member_ref.cpp' FAILED ********************
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 1
/home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./bin/clang++ -fopenmp    -I /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.src/offload/test -I /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -L /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload -L /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./lib -L /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/openmp/runtime/src  -nogpulib -Wl,-rpath,/home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload -Wl,-rpath,/home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -Wl,-rpath,/home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./lib  -fopenmp-targets=amdgcn-amd-amdhsa /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.src/offload/test/mapping/data_member_ref.cpp -o /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload/test/amdgcn-amd-amdhsa/mapping/Output/data_member_ref.cpp.tmp -Xoffload-linker -lc -Xoffload-linker -lm /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./lib/libomptarget.devicertl.a && /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload/test/amdgcn-amd-amdhsa/mapping/Output/data_member_ref.cpp.tmp | /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./bin/FileCheck /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.src/offload/test/mapping/data_member_ref.cpp
# executed command: /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./bin/clang++ -fopenmp -I /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.src/offload/test -I /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -L /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload -L /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./lib -L /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -nogpulib -Wl,-rpath,/home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload -Wl,-rpath,/home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -Wl,-rpath,/home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./lib -fopenmp-targets=amdgcn-amd-amdhsa /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.src/offload/test/mapping/data_member_ref.cpp -o /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload/test/amdgcn-amd-amdhsa/mapping/Output/data_member_ref.cpp.tmp -Xoffload-linker -lc -Xoffload-linker -lm /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./lib/libomptarget.devicertl.a
# executed command: /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload/test/amdgcn-amd-amdhsa/mapping/Output/data_member_ref.cpp.tmp
# note: command had no output on stdout or stderr
# error: command failed with exit status: -11
# executed command: /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./bin/FileCheck /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.src/offload/test/mapping/data_member_ref.cpp
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./bin/FileCheck /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.src/offload/test/mapping/data_member_ref.cpp
# `-----------------------------
# error: command failed with exit status: 2

--

********************


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