[clang] [clang][CoverageMapping] do not emit gap when either end is an `ImplicitValueInitExpr` (PR #89564)

[Wentao Zhang via cfe-commits]

https://github.com/whentojump updated https://github.com/llvm/llvm-project/pull/89564

>From abbdb318d62bb2e5ab6f07e7d0fe11f4a06b5a11 Mon Sep 17 00:00:00 2001
From: Wentao Zhang <zhangwt1997 at gmail.com>
Date: Sun, 21 Apr 2024 21:27:01 -0500
Subject: [PATCH] [clang][CoverageMapping] do not emit gap when either end is
 an ImplicitValueInitExpr

---
 clang/lib/CodeGen/CoverageMappingGen.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/clang/lib/CodeGen/CoverageMappingGen.cpp b/clang/lib/CodeGen/CoverageMappingGen.cpp
index 64c39c5de351c7..dd8c0577d758ca 100644
--- a/clang/lib/CodeGen/CoverageMappingGen.cpp
+++ b/clang/lib/CodeGen/CoverageMappingGen.cpp
@@ -1368,9 +1368,12 @@ struct CounterCoverageMappingBuilder
     for (const Stmt *Child : S->children())
       if (Child) {
         // If last statement contains terminate statements, add a gap area
-        // between the two statements. Skipping attributed statements, because
-        // they don't have valid start location.
-        if (LastStmt && HasTerminateStmt && !isa<AttributedStmt>(Child)) {
+        // between the two statements. Skipping attributed statements and
+        // implicit initializations, because they don't have valid source
+        // location.
+        if (LastStmt && HasTerminateStmt && !isa<AttributedStmt>(Child) &&
+            !isa<ImplicitValueInitExpr>(Child) &&
+            !isa<ImplicitValueInitExpr>(LastStmt)) {
           auto Gap = findGapAreaBetween(getEnd(LastStmt), getStart(Child));
           if (Gap)
             fillGapAreaWithCount(Gap->getBegin(), Gap->getEnd(),