[PATCH] D25606: alpha.core.UnreachableCode - don't warn about unreachable code inside macro

[Daniel Marjamäki via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL284477: alpha.core.UnreachableCode - don't warn about 
unreachable code inside macro (authored by danielmarjamaki).

Changed prior to commit:
  https://reviews.llvm.org/D25606?vs=74849&id=74990#toc

Repository:
  rL LLVM

https://reviews.llvm.org/D25606

Files:
  cfe/trunk/lib/StaticAnalyzer/Checkers/UnreachableCodeChecker.cpp
  cfe/trunk/test/Analysis/unreachable-code-path.c


Index: cfe/trunk/test/Analysis/unreachable-code-path.c
===================================================================
--- cfe/trunk/test/Analysis/unreachable-code-path.c
+++ cfe/trunk/test/Analysis/unreachable-code-path.c
@@ -206,3 +206,10 @@
   int x = inlineFunction(i);
   x && x < 10; // no-warning
 }
+
+// Don't warn in a macro
+#define RETURN(X)  do { return; } while (0)
+void macro(void) {
+  RETURN(1); // no-warning
+}
+
Index: cfe/trunk/lib/StaticAnalyzer/Checkers/UnreachableCodeChecker.cpp
===================================================================
--- cfe/trunk/lib/StaticAnalyzer/Checkers/UnreachableCodeChecker.cpp
+++ cfe/trunk/lib/StaticAnalyzer/Checkers/UnreachableCodeChecker.cpp
@@ -147,6 +147,14 @@
     PathDiagnosticLocation DL;
     SourceLocation SL;
     if (const Stmt *S = getUnreachableStmt(CB)) {
+      // In macros, 'do {...} while (0)' is often used. Don't warn about the
+      // condition 0 when it is unreachable.
+      if (S->getLocStart().isMacroID())
+        if (const auto *I = dyn_cast<IntegerLiteral>(S))
+          if (I->getValue() == 0ULL)
+            if (const Stmt *Parent = PM->getParent(S))
+              if (isa<DoStmt>(Parent))
+                continue;
       SR = S->getSourceRange();
       DL = PathDiagnosticLocation::createBegin(S, B.getSourceManager(), LC);
       SL = DL.asLocation();



Index: cfe/trunk/test/Analysis/unreachable-code-path.c
===================================================================
--- cfe/trunk/test/Analysis/unreachable-code-path.c
+++ cfe/trunk/test/Analysis/unreachable-code-path.c
@@ -206,3 +206,10 @@
   int x = inlineFunction(i);
   x && x < 10; // no-warning
 }
+
+// Don't warn in a macro
+#define RETURN(X)  do { return; } while (0)
+void macro(void) {
+  RETURN(1); // no-warning
+}
+
Index: cfe/trunk/lib/StaticAnalyzer/Checkers/UnreachableCodeChecker.cpp
===================================================================
--- cfe/trunk/lib/StaticAnalyzer/Checkers/UnreachableCodeChecker.cpp
+++ cfe/trunk/lib/StaticAnalyzer/Checkers/UnreachableCodeChecker.cpp
@@ -147,6 +147,14 @@
     PathDiagnosticLocation DL;
     SourceLocation SL;
     if (const Stmt *S = getUnreachableStmt(CB)) {
+      // In macros, 'do {...} while (0)' is often used. Don't warn about the
+      // condition 0 when it is unreachable.
+      if (S->getLocStart().isMacroID())
+        if (const auto *I = dyn_cast<IntegerLiteral>(S))
+          if (I->getValue() == 0ULL)
+            if (const Stmt *Parent = PM->getParent(S))
+              if (isa<DoStmt>(Parent))
+                continue;
       SR = S->getSourceRange();
       DL = PathDiagnosticLocation::createBegin(S, B.getSourceManager(), LC);
       SL = DL.asLocation();

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