[analyzer] Only include uniqueling location as issue_hash when available

This makes us more optimistic when matching reports in a changing code
base. Addresses Jordan's feedback for r171825.

llvm-svn: 171884

clang/lib/StaticAnalyzer/Core/PlistDiagnostics.cpp

@@ -495,25 +495,32 @@ void PlistDiagnostics::FlushDiagnosticsImpl(
         // Output the bug hash for issue unique-ing. Currently, it's just an
         // offset from the beginning of the function.
         if (const Stmt *Body = DeclWithIssue->getBody()) {
-          FullSourceLoc Loc(SM->getExpansionLoc(D->getLocation().asLocation()),
-                            *SM);
-          FullSourceLoc FunLoc(SM->getExpansionLoc(Body->getLocStart()), *SM);
-          o << "  <key>issue_hash</key><string>"
-            << Loc.getExpansionLineNumber() - FunLoc.getExpansionLineNumber();
           
-          // Augment the hash with the bug uniqueing location. For example, 
-          // this ensures that two leaks reported on the same line will have 
-          // different issue_hashes.
+          // If the bug uniqueing location exists, use it for the hash.
+          // For example, this ensures that two leaks reported on the same line
+          // will have different issue_hashes and that the hash will identify
+          // the leak location even after code is added between the allocation
+          // site and the end of scope (leak report location).
           PathDiagnosticLocation UPDLoc = D->getUniqueingLoc();
           if (UPDLoc.isValid()) {
             FullSourceLoc UL(SM->getExpansionLoc(UPDLoc.asLocation()),
                              *SM);
             FullSourceLoc UFunL(SM->getExpansionLoc(
               D->getUniqueingDecl()->getBody()->getLocStart()), *SM);
-            o << "_" 
-              << UL.getExpansionLineNumber() - UFunL.getExpansionLineNumber();
+            o << "  <key>issue_hash</key><string>"
+              << UL.getExpansionLineNumber() - UFunL.getExpansionLineNumber()
+              << "</string>\n";
+
+          // Otherwise, use the location on which the bug is reported.
+          } else {
+            FullSourceLoc L(SM->getExpansionLoc(D->getLocation().asLocation()),
+                            *SM);
+            FullSourceLoc FunL(SM->getExpansionLoc(Body->getLocStart()), *SM);
+            o << "  <key>issue_hash</key><string>"
+              << L.getExpansionLineNumber() - FunL.getExpansionLineNumber()
+              << "</string>\n";
           }
-          o << "</string>\n";
+
         }
       }
     }

clang/test/Analysis/malloc-plist.c

@@ -388,7 +388,7 @@ void use_function_with_leak7() {
 // CHECK-NEXT:    <key>type</key><string>Memory leak</string>
 // CHECK-NEXT:   <key>issue_context_kind</key><string>function</string>
 // CHECK-NEXT:   <key>issue_context</key><string>diagnosticTest</string>
-// CHECK-NEXT:   <key>issue_hash</key><string>5_2</string>
+// CHECK-NEXT:   <key>issue_hash</key><string>2</string>
 // CHECK-NEXT:   <key>location</key>
 // CHECK-NEXT:   <dict>
 // CHECK-NEXT:    <key>line</key><integer>15</integer>
@@ -550,7 +550,7 @@ void use_function_with_leak7() {
 // CHECK-NEXT:    <key>type</key><string>Memory leak</string>
 // CHECK-NEXT:   <key>issue_context_kind</key><string>function</string>
 // CHECK-NEXT:   <key>issue_context</key><string>myArrayAllocation</string>
-// CHECK-NEXT:   <key>issue_hash</key><string>4_2</string>
+// CHECK-NEXT:   <key>issue_hash</key><string>2</string>
 // CHECK-NEXT:   <key>location</key>
 // CHECK-NEXT:   <dict>
 // CHECK-NEXT:    <key>line</key><integer>22</integer>
@@ -935,7 +935,7 @@ void use_function_with_leak7() {
 // CHECK-NEXT:    <key>type</key><string>Memory leak</string>
 // CHECK-NEXT:   <key>issue_context_kind</key><string>function</string>
 // CHECK-NEXT:   <key>issue_context</key><string>reallocDiagnostics</string>
-// CHECK-NEXT:   <key>issue_hash</key><string>5_1</string>
+// CHECK-NEXT:   <key>issue_hash</key><string>1</string>
 // CHECK-NEXT:   <key>location</key>
 // CHECK-NEXT:   <dict>
 // CHECK-NEXT:    <key>line</key><integer>29</integer>
@@ -1334,7 +1334,7 @@ void use_function_with_leak7() {
 // CHECK-NEXT:    <key>type</key><string>Memory leak</string>
 // CHECK-NEXT:   <key>issue_context_kind</key><string>function</string>
 // CHECK-NEXT:   <key>issue_context</key><string>test_wrapper</string>
-// CHECK-NEXT:   <key>issue_hash</key><string>3_1</string>
+// CHECK-NEXT:   <key>issue_hash</key><string>1</string>
 // CHECK-NEXT:   <key>location</key>
 // CHECK-NEXT:   <dict>
 // CHECK-NEXT:    <key>line</key><integer>46</integer>
@@ -2413,7 +2413,7 @@ void use_function_with_leak7() {
 // CHECK-NEXT:    <key>type</key><string>Memory leak</string>
 // CHECK-NEXT:   <key>issue_context_kind</key><string>function</string>
 // CHECK-NEXT:   <key>issue_context</key><string>reallocIntra</string>
-// CHECK-NEXT:   <key>issue_hash</key><string>3_1</string>
+// CHECK-NEXT:   <key>issue_hash</key><string>1</string>
 // CHECK-NEXT:   <key>location</key>
 // CHECK-NEXT:   <dict>
 // CHECK-NEXT:    <key>line</key><integer>77</integer>
@@ -2681,7 +2681,7 @@ void use_function_with_leak7() {
 // CHECK-NEXT:    <key>type</key><string>Memory leak</string>
 // CHECK-NEXT:   <key>issue_context_kind</key><string>function</string>
 // CHECK-NEXT:   <key>issue_context</key><string>use_ret</string>
-// CHECK-NEXT:   <key>issue_hash</key><string>3_2</string>
+// CHECK-NEXT:   <key>issue_hash</key><string>2</string>
 // CHECK-NEXT:   <key>location</key>
 // CHECK-NEXT:   <dict>
 // CHECK-NEXT:    <key>line</key><integer>87</integer>
@@ -2843,7 +2843,7 @@ void use_function_with_leak7() {
 // CHECK-NEXT:    <key>type</key><string>Memory leak</string>
 // CHECK-NEXT:   <key>issue_context_kind</key><string>function</string>
 // CHECK-NEXT:   <key>issue_context</key><string>LeakedSymbol</string>
-// CHECK-NEXT:   <key>issue_hash</key><string>8_3</string>
+// CHECK-NEXT:   <key>issue_hash</key><string>3</string>
 // CHECK-NEXT:   <key>location</key>
 // CHECK-NEXT:   <dict>
 // CHECK-NEXT:    <key>line</key><integer>98</integer>
@@ -3048,7 +3048,7 @@ void use_function_with_leak7() {
 // CHECK-NEXT:    <key>type</key><string>Memory leak</string>
 // CHECK-NEXT:   <key>issue_context_kind</key><string>function</string>
 // CHECK-NEXT:   <key>issue_context</key><string>function_with_leak1</string>
-// CHECK-NEXT:   <key>issue_hash</key><string>2_1</string>
+// CHECK-NEXT:   <key>issue_hash</key><string>1</string>
 // CHECK-NEXT:   <key>location</key>
 // CHECK-NEXT:   <dict>
 // CHECK-NEXT:    <key>line</key><integer>104</integer>
@@ -3253,7 +3253,7 @@ void use_function_with_leak7() {
 // CHECK-NEXT:    <key>type</key><string>Memory leak</string>
 // CHECK-NEXT:   <key>issue_context_kind</key><string>function</string>
 // CHECK-NEXT:   <key>issue_context</key><string>function_with_leak2</string>
-// CHECK-NEXT:   <key>issue_hash</key><string>2_1</string>
+// CHECK-NEXT:   <key>issue_hash</key><string>1</string>
 // CHECK-NEXT:   <key>location</key>
 // CHECK-NEXT:   <dict>
 // CHECK-NEXT:    <key>line</key><integer>112</integer>
@@ -3555,7 +3555,7 @@ void use_function_with_leak7() {
 // CHECK-NEXT:    <key>type</key><string>Memory leak</string>
 // CHECK-NEXT:   <key>issue_context_kind</key><string>function</string>
 // CHECK-NEXT:   <key>issue_context</key><string>function_with_leak3</string>
-// CHECK-NEXT:   <key>issue_hash</key><string>3_1</string>
+// CHECK-NEXT:   <key>issue_hash</key><string>1</string>
 // CHECK-NEXT:   <key>location</key>
 // CHECK-NEXT:   <dict>
 // CHECK-NEXT:    <key>line</key><integer>121</integer>
@@ -3857,7 +3857,7 @@ void use_function_with_leak7() {
 // CHECK-NEXT:    <key>type</key><string>Memory leak</string>
 // CHECK-NEXT:   <key>issue_context_kind</key><string>function</string>
 // CHECK-NEXT:   <key>issue_context</key><string>function_with_leak4</string>
-// CHECK-NEXT:   <key>issue_hash</key><string>5_1</string>
+// CHECK-NEXT:   <key>issue_hash</key><string>1</string>
 // CHECK-NEXT:   <key>location</key>
 // CHECK-NEXT:   <dict>
 // CHECK-NEXT:    <key>line</key><integer>132</integer>
@@ -4062,7 +4062,7 @@ void use_function_with_leak7() {
 // CHECK-NEXT:    <key>type</key><string>Memory leak</string>
 // CHECK-NEXT:   <key>issue_context_kind</key><string>function</string>
 // CHECK-NEXT:   <key>issue_context</key><string>function_with_leak5</string>
-// CHECK-NEXT:   <key>issue_hash</key><string>2_1</string>
+// CHECK-NEXT:   <key>issue_hash</key><string>1</string>
 // CHECK-NEXT:   <key>location</key>
 // CHECK-NEXT:   <dict>
 // CHECK-NEXT:    <key>line</key><integer>143</integer>
@@ -4267,7 +4267,7 @@ void use_function_with_leak7() {
 // CHECK-NEXT:    <key>type</key><string>Memory leak</string>
 // CHECK-NEXT:   <key>issue_context_kind</key><string>function</string>
 // CHECK-NEXT:   <key>issue_context</key><string>function_with_leak6</string>
-// CHECK-NEXT:   <key>issue_hash</key><string>2_1</string>
+// CHECK-NEXT:   <key>issue_hash</key><string>1</string>
 // CHECK-NEXT:   <key>location</key>
 // CHECK-NEXT:   <dict>
 // CHECK-NEXT:    <key>line</key><integer>154</integer>
@@ -4501,7 +4501,7 @@ void use_function_with_leak7() {
 // CHECK-NEXT:    <key>type</key><string>Memory leak</string>
 // CHECK-NEXT:   <key>issue_context_kind</key><string>function</string>
 // CHECK-NEXT:   <key>issue_context</key><string>use_function_with_leak7</string>
-// CHECK-NEXT:   <key>issue_hash</key><string>2_1</string>
+// CHECK-NEXT:   <key>issue_hash</key><string>1</string>
 // CHECK-NEXT:   <key>location</key>
 // CHECK-NEXT:   <dict>
 // CHECK-NEXT:    <key>line</key><integer>170</integer>