[OPENMP][CUDA]Do not emit warnings for variables in late-reported asm

statements.

If the assembler instruction is not generated and the delayed diagnostic
is emitted, we may end up with extra warning message for variables used
in the asm statement. Since the asm statement is not built, the
variables may be left non-referenced and it may produce a warning about
a use of the non-initialized variables.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@354928 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaStmtAsm.cpp

@@ -262,10 +262,15 @@ StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
       OutputName = Names[i]->getName();
 
     TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName);
-    if (!Context.getTargetInfo().validateOutputConstraint(Info))
-      return StmtResult(targetDiag(Literal->getBeginLoc(),
-                                   diag::err_asm_invalid_output_constraint)
-                        << Info.getConstraintStr());
+    if (!Context.getTargetInfo().validateOutputConstraint(Info)) {
+      targetDiag(Literal->getBeginLoc(),
+                 diag::err_asm_invalid_output_constraint)
+          << Info.getConstraintStr();
+      return new (Context)
+          GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
+                     NumInputs, Names, Constraints, Exprs.data(), AsmString,
+                     NumClobbers, Clobbers, RParenLoc);
+    }
 
     ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
     if (ER.isInvalid())
@@ -318,10 +323,15 @@ StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
     }
 
     unsigned Size = Context.getTypeSize(OutputExpr->getType());
-    if (!Context.getTargetInfo().validateOutputSize(Literal->getString(), Size))
-      return StmtResult(targetDiag(OutputExpr->getBeginLoc(),
-                                   diag::err_asm_invalid_output_size)
-                        << Info.getConstraintStr());
+    if (!Context.getTargetInfo().validateOutputSize(Literal->getString(),
+                                                    Size)) {
+      targetDiag(OutputExpr->getBeginLoc(), diag::err_asm_invalid_output_size)
+          << Info.getConstraintStr();
+      return new (Context)
+          GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
+                     NumInputs, Names, Constraints, Exprs.data(), AsmString,
+                     NumClobbers, Clobbers, RParenLoc);
+    }
   }
 
   SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos;
@@ -337,9 +347,12 @@ StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
     TargetInfo::ConstraintInfo Info(Literal->getString(), InputName);
     if (!Context.getTargetInfo().validateInputConstraint(OutputConstraintInfos,
                                                          Info)) {
-      return StmtResult(targetDiag(Literal->getBeginLoc(),
-                                   diag::err_asm_invalid_input_constraint)
-                        << Info.getConstraintStr());
+      targetDiag(Literal->getBeginLoc(), diag::err_asm_invalid_input_constraint)
+          << Info.getConstraintStr();
+      return new (Context)
+          GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
+                     NumInputs, Names, Constraints, Exprs.data(), AsmString,
+                     NumClobbers, Clobbers, RParenLoc);
     }
 
     ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
@@ -423,10 +436,14 @@ StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
 
     StringRef Clobber = Literal->getString();
 
-    if (!Context.getTargetInfo().isValidClobber(Clobber))
-      return StmtResult(targetDiag(Literal->getBeginLoc(),
-                                   diag::err_asm_unknown_register_name)
-                        << Clobber);
+    if (!Context.getTargetInfo().isValidClobber(Clobber)) {
+      targetDiag(Literal->getBeginLoc(), diag::err_asm_unknown_register_name)
+          << Clobber;
+      return new (Context)
+          GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
+                     NumInputs, Names, Constraints, Exprs.data(), AsmString,
+                     NumClobbers, Clobbers, RParenLoc);
+    }
   }
 
   GCCAsmStmt *NS =
@@ -437,10 +454,11 @@ StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
   // have.
   SmallVector<GCCAsmStmt::AsmStringPiece, 8> Pieces;
   unsigned DiagOffs;
-  if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs))
-    return StmtResult(
-        targetDiag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID)
-        << AsmString->getSourceRange());
+  if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) {
+    targetDiag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID)
+        << AsmString->getSourceRange();
+    return NS;
+  }
 
   // Validate constraints and modifiers.
   for (unsigned i = 0, e = Pieces.size(); i != e; ++i) {
@@ -496,13 +514,14 @@ StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
     TargetInfo::ConstraintInfo &Info = OutputConstraintInfos[i];
     StringRef ConstraintStr = Info.getConstraintStr();
     unsigned AltCount = ConstraintStr.count(',') + 1;
-    if (NumAlternatives == ~0U)
+    if (NumAlternatives == ~0U) {
       NumAlternatives = AltCount;
-    else if (NumAlternatives != AltCount)
-      return StmtResult(
-          targetDiag(NS->getOutputExpr(i)->getBeginLoc(),
-                     diag::err_asm_unexpected_constraint_alternatives)
-          << NumAlternatives << AltCount);
+    } else if (NumAlternatives != AltCount) {
+      targetDiag(NS->getOutputExpr(i)->getBeginLoc(),
+                 diag::err_asm_unexpected_constraint_alternatives)
+          << NumAlternatives << AltCount;
+      return NS;
+    }
   }
   SmallVector<size_t, 4> InputMatchedToOutput(OutputConstraintInfos.size(),
                                               ~0U);
@@ -510,13 +529,14 @@ StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
     TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i];
     StringRef ConstraintStr = Info.getConstraintStr();
     unsigned AltCount = ConstraintStr.count(',') + 1;
-    if (NumAlternatives == ~0U)
+    if (NumAlternatives == ~0U) {
       NumAlternatives = AltCount;
-    else if (NumAlternatives != AltCount)
-      return StmtResult(
-          targetDiag(NS->getInputExpr(i)->getBeginLoc(),
-                     diag::err_asm_unexpected_constraint_alternatives)
-          << NumAlternatives << AltCount);
+    } else if (NumAlternatives != AltCount) {
+      targetDiag(NS->getInputExpr(i)->getBeginLoc(),
+                 diag::err_asm_unexpected_constraint_alternatives)
+          << NumAlternatives << AltCount;
+      return NS;
+    }
 
     // If this is a tied constraint, verify that the output and input have
     // either exactly the same type, or that they are int/ptr operands with the
@@ -534,11 +554,10 @@ StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
       targetDiag(NS->getInputExpr(i)->getBeginLoc(),
                  diag::err_asm_input_duplicate_match)
           << TiedTo;
-      return StmtResult(
-          targetDiag(
-              NS->getInputExpr(InputMatchedToOutput[TiedTo])->getBeginLoc(),
-              diag::note_asm_input_duplicate_first)
-          << TiedTo);
+      targetDiag(NS->getInputExpr(InputMatchedToOutput[TiedTo])->getBeginLoc(),
+                 diag::note_asm_input_duplicate_first)
+          << TiedTo;
+      return NS;
     }
     InputMatchedToOutput[TiedTo] = i;
 
@@ -623,10 +642,10 @@ StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
       continue;
     }
 
-    return StmtResult(targetDiag(InputExpr->getBeginLoc(),
-                                 diag::err_asm_tying_incompatible_types)
-                      << InTy << OutTy << OutputExpr->getSourceRange()
-                      << InputExpr->getSourceRange());
+    targetDiag(InputExpr->getBeginLoc(), diag::err_asm_tying_incompatible_types)
+        << InTy << OutTy << OutputExpr->getSourceRange()
+        << InputExpr->getSourceRange();
+    return NS;
   }
 
   // Check for conflicts between clobber list and input or output lists
@@ -634,8 +653,7 @@ StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
       getClobberConflictLocation(Exprs, Constraints, Clobbers, NumClobbers,
                                  Context.getTargetInfo(), Context);
   if (ConstraintLoc.isValid())
-    return StmtResult(
-        targetDiag(ConstraintLoc, diag::error_inoutput_conflict_with_clobber));
+    targetDiag(ConstraintLoc, diag::error_inoutput_conflict_with_clobber);
 
   return NS;
 }

test/OpenMP/nvptx_asm_delayed_diags.c

@@ -1,7 +1,7 @@
 // RUN: %clang_cc1 -fopenmp -x c -triple i386-unknown-unknown -fopenmp-targets=nvptx-nvidia-cuda -emit-llvm-bc %s -o %t-x86-host.bc
-// RUN: %clang_cc1 -verify -fopenmp -x c -triple nvptx-unknown-unknown -fopenmp-targets=nvptx-nvidia-cuda %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-x86-host.bc -fsyntax-only
-// RUN: %clang_cc1 -verify -DDIAGS -DIMMEDIATE -fopenmp -x c -triple nvptx-unknown-unknown -fopenmp-targets=nvptx-nvidia-cuda %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-x86-host.bc -fsyntax-only
-// RUN: %clang_cc1 -verify -DDIAGS -DDELAYED -fopenmp -x c -triple nvptx-unknown-unknown -fopenmp-targets=nvptx-nvidia-cuda %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-x86-host.bc -fsyntax-only
+// RUN: %clang_cc1 -verify -fopenmp -x c -triple nvptx-unknown-unknown -fopenmp-targets=nvptx-nvidia-cuda %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-x86-host.bc -fsyntax-only -Wuninitialized
+// RUN: %clang_cc1 -verify -DDIAGS -DIMMEDIATE -fopenmp -x c -triple nvptx-unknown-unknown -fopenmp-targets=nvptx-nvidia-cuda %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-x86-host.bc -fsyntax-only -Wuninitialized
+// RUN: %clang_cc1 -verify -DDIAGS -DDELAYED -fopenmp -x c -triple nvptx-unknown-unknown -fopenmp-targets=nvptx-nvidia-cuda %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-x86-host.bc -fsyntax-only -Wuninitialized
 // REQUIRES: x86-registered-target
 // REQUIRES: nvptx-registered-target
 

test/Sema/asm.c

@@ -249,7 +249,7 @@ void fn6() {
     int a;
   __asm__(""
             : "=rm"(a), "=rm"(a)
-            : "11m"(a)) // expected-error {{invalid input constraint '11m' in asm}}
+            : "11m"(a)); // expected-error {{invalid input constraint '11m' in asm}}
 }
 
 // PR14269

test/SemaCUDA/asm_delayed_diags.cu

@@ -1,8 +1,8 @@
-// RUN: %clang_cc1 -fsyntax-only -verify %s -DHOST -triple x86_64-unknown-linux-gnu
-// RUN: %clang_cc1 -fsyntax-only -verify %s -DHOST -DHOST_USED -triple x86_64-unknown-linux-gnu
-// RUN: %clang_cc1 -fsyntax-only -fcuda-is-device -verify %s -DDEVICE_NOT_USED -triple nvptx-unknown-cuda
-// RUN: %clang_cc1 -fsyntax-only -fcuda-is-device -verify %s -DDEVICE -triple nvptx-unknown-cuda
-// RUN: %clang_cc1 -fsyntax-only -fcuda-is-device -verify %s -DDEVICE -DDEVICE_USED -triple nvptx-unknown-cuda
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DHOST -triple x86_64-unknown-linux-gnu -Wuninitialized
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DHOST -DHOST_USED -triple x86_64-unknown-linux-gnu -Wuninitialized
+// RUN: %clang_cc1 -fsyntax-only -fcuda-is-device -verify %s -DDEVICE_NOT_USED -triple nvptx-unknown-cuda -Wuninitialized
+// RUN: %clang_cc1 -fsyntax-only -fcuda-is-device -verify %s -DDEVICE -triple nvptx-unknown-cuda -Wuninitialized
+// RUN: %clang_cc1 -fsyntax-only -fcuda-is-device -verify %s -DDEVICE -DDEVICE_USED -triple nvptx-unknown-cuda -Wuninitialized
 
 // REQUIRES: x86-registered-target
 // REQUIRES: nvptx-registered-target