[PATCH] D146874: [clangd] Fix a hover crash on unsigned 64bit value

[Younan Zhang via Phabricator via cfe-commits]

zyounan created this revision.
Herald added subscribers: kadircet, arphaman.
Herald added a project: All.
zyounan requested review of this revision.
Herald added subscribers: cfe-commits, MaskRay, ilya-biryukov.
Herald added a project: clang-tools-extra.

This patch adapts to D140059 <https://reviews.llvm.org/D140059>, which makes an assumption that the
caller of `APSInt::getExtValue` promises no narrowing conversion
happens, i.e., from signed int64 to unsigned int64.

It also fixes clangd/clangd#1557.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D146874

Files:
  clang-tools-extra/clangd/Hover.cpp
  clang-tools-extra/clangd/unittests/HoverTests.cpp


Index: clang-tools-extra/clangd/unittests/HoverTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/HoverTests.cpp
+++ clang-tools-extra/clangd/unittests/HoverTests.cpp
@@ -2947,6 +2947,15 @@
     getHover(AST, P, format::getLLVMStyle(), nullptr);
 }
 
+TEST(Hover, NoCrashAPInt64) {
+  Annotations T(R"cpp(
+    constexpr unsigned long value = -1; // wrap around
+    void foo() { va$1^lue; }
+  )cpp");
+  auto AST = TestTU::withCode(T.code()).build();
+  getHover(AST, T.point("1"), format::getLLVMStyle(), nullptr);
+}
+
 TEST(Hover, DocsFromMostSpecial) {
   Annotations T(R"cpp(
   // doc1
Index: clang-tools-extra/clangd/Hover.cpp
===================================================================
--- clang-tools-extra/clangd/Hover.cpp
+++ clang-tools-extra/clangd/Hover.cpp
@@ -395,7 +395,7 @@
 // -2    => 0xfffffffe
 // -2^32 => 0xfffffffeffffffff
 static llvm::FormattedNumber printHex(const llvm::APSInt &V) {
-  uint64_t Bits = V.getExtValue();
+  uint64_t Bits = V.getZExtValue();
   if (V.isNegative() && V.getSignificantBits() <= 32)
     return llvm::format_hex(uint32_t(Bits), 0);
   return llvm::format_hex(Bits, 0);


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