[CGDebugInfo] Fix -femit-debug-entry-values crash on os_log_helpers

An os_log_helper FunctionDecl may not have a body. Ignore these for the
purposes of debug entry value emission.

Fixes an assertion failure seen in a stage2 build of clang:

Assertion failed: (FD->hasBody() && "Functions must have body here"),
function analyzeParametersModification

llvm-svn: 365716

2 files changed, 17 insertions, 5 deletions

diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index f49d1ef8787..f6ee7ee26d4 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -3587,9 +3587,12 @@ void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
 
   // We use the SPDefCache only in the case when the debug entry values option
   // is set, in order to speed up parameters modification analysis.
-  if (CGM.getCodeGenOpts().EnableDebugEntryValues && HasDecl &&
-      isa<FunctionDecl>(D))
-    SPDefCache[cast<FunctionDecl>(D)].reset(SP);
+  //
+  // FIXME: Use AbstractCallee here to support ObjCMethodDecl.
+  if (CGM.getCodeGenOpts().EnableDebugEntryValues && HasDecl)
+    if (auto *FD = dyn_cast<FunctionDecl>(D))
+      if (FD->hasBody() && !FD->param_empty())
+        SPDefCache[FD].reset(SP);
 
   if (CGM.getCodeGenOpts().DwarfVersion >= 5) {
     // Starting with DWARF V5 method declarations are emitted as children of
diff --git a/clang/test/CodeGen/debug-info-param-modification.c b/clang/test/CodeGen/debug-info-param-modification.c
index ef7ff922560..f2aa4c7290e 100644
--- a/clang/test/CodeGen/debug-info-param-modification.c
+++ b/clang/test/CodeGen/debug-info-param-modification.c
@@ -1,12 +1,21 @@
-// RUN: %clang -Xclang -femit-debug-entry-values -g -O2 -S -target x86_64-none-linux-gnu -emit-llvm %s -o - | FileCheck %s -check-prefix=CHECK-ENTRY-VAL-OPT
+// RUN: %clang -Xclang -femit-debug-entry-values -g -O2 -Xclang -disable-llvm-passes -S -target x86_64-none-linux-gnu -emit-llvm %s -o - | FileCheck %s -check-prefix=CHECK-ENTRY-VAL-OPT
 // CHECK-ENTRY-VAL-OPT: !DILocalVariable(name: "a", arg: 1, scope: {{.*}}, file: {{.*}}, line: {{.*}}, type: {{.*}})
 // CHECK-ENTRY-VAL-OPT: !DILocalVariable(name: "b", arg: 2, scope: {{.*}}, file: {{.*}}, line: {{.*}}, type: {{.*}}, flags: DIFlagArgumentNotModified)
 //
-// RUN: %clang -g -O2 -target x86_64-none-linux-gnu -S -emit-llvm %s -o - | FileCheck %s
+// For the os_log_helper:
+// CHECK-ENTRY-VAL-OPT: !DILocalVariable(name: "buffer", arg: 1, {{.*}}, flags: DIFlagArtificial)
+//
+// RUN: %clang -g -O2 -Xclang -disable-llvm-passes -target x86_64-none-linux-gnu -S -emit-llvm %s -o - | FileCheck %s
 // CHECK-NOT: !DILocalVariable(name: "b", arg: 2, scope: {{.*}}, file: {{.*}}, line: {{.*}}, type: {{.*}}, flags: DIFlagArgumentNotModified)
 //
+// For the os_log_helper:
+// CHECK: !DILocalVariable(name: "buffer", arg: 1, {{.*}}, flags: DIFlagArtificial)
 
 int fn2 (int a, int b) {
   ++a;
   return b;
 }
+
+void test_builtin_os_log(void *buf, int i, const char *data) {
+  __builtin_os_log_format(buf, "%d %{public}s %{private}.16P", i, data, data);
+}