[clang] [clang][RISCV] Fix clang dwarf info generation for unprtototyped function (PR #150022)

[Georgiy Samoylov via cfe-commits]

https://github.com/sga-sc updated https://github.com/llvm/llvm-project/pull/150022

>From 94f1d8c353982b72b138131bd4127bbe84191cf7 Mon Sep 17 00:00:00 2001
From: Georgiy Samoylov <g.samoylov at syntacore.com>
Date: Tue, 29 Jul 2025 13:28:59 +0300
Subject: [PATCH 1/2] [clang][DebugInfo] Changed way of getting callee function

---
 clang/lib/CodeGen/CGDebugInfo.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index a371b6755f74d..271d4bae0015b 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -4805,7 +4805,8 @@ void CGDebugInfo::EmitFuncDeclForCallSite(llvm::CallBase *CallOrInvoke,
                                           const FunctionDecl *CalleeDecl) {
   if (!CallOrInvoke)
     return;
-  auto *Func = CallOrInvoke->getCalledFunction();
+  auto *Func =
+      dyn_cast_or_null<llvm::Function>(CallOrInvoke->getCalledOperand());
   if (!Func)
     return;
   if (Func->getSubprogram())

>From 1b80fddb1efb2e8a7bd57de898abf728ae96a5e2 Mon Sep 17 00:00:00 2001
From: Georgiy Samoylov <g.samoylov at syntacore.com>
Date: Thu, 31 Jul 2025 13:26:29 +0300
Subject: [PATCH 2/2] [clang][test] Added C test for describing all calls

---
 .../CodeGen/dbg-info-all-calls-described.c    | 88 +++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 clang/test/CodeGen/dbg-info-all-calls-described.c

diff --git a/clang/test/CodeGen/dbg-info-all-calls-described.c b/clang/test/CodeGen/dbg-info-all-calls-described.c
new file mode 100644
index 0000000000000..3ca3aaa0b70f4
--- /dev/null
+++ b/clang/test/CodeGen/dbg-info-all-calls-described.c
@@ -0,0 +1,88 @@
+// Test that call site debug info is (un)supported in various configurations.
+
+// Supported: DWARF5, -O1, standalone DI
+// RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple %s -o - \
+// RUN:   -O1 -disable-llvm-passes \
+// RUN:   -debug-info-kind=standalone -dwarf-version=5 \
+// RUN: | FileCheck %s -check-prefix=HAS-ATTR \
+// RUN:     -implicit-check-not=DISubprogram -implicit-check-not=DIFlagAllCallsDescribed
+
+// Supported: DWARF4 + LLDB tuning, -O1, limited DI
+// RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple %s -o - \
+// RUN:   -O1 -disable-llvm-passes \
+// RUN:   -debugger-tuning=lldb \
+// RUN:   -debug-info-kind=standalone -dwarf-version=4 \
+// RUN: | FileCheck %s -check-prefix=HAS-ATTR \
+// RUN:     -implicit-check-not=DISubprogram -implicit-check-not=DIFlagAllCallsDescribed
+
+// Note: DIFlagAllCallsDescribed may have been enabled prematurely when tuning
+// for GDB under -gdwarf-4 in https://reviews.llvm.org/D69743. It's possible
+// this should have been 'Unsupported' until entry values emission was enabled
+// by default.
+//
+// Supported: DWARF4 + GDB tuning
+// RUN: %clang_cc1 -emit-llvm -triple x86_64-linux-gnu \
+// RUN:   %s -o - -O1 -disable-llvm-passes -debugger-tuning=gdb \
+// RUN:   -debug-info-kind=standalone -dwarf-version=4 \
+// RUN: | FileCheck %s -check-prefix=HAS-ATTR \
+// RUN:     -implicit-check-not=DIFlagAllCallsDescribed
+
+// Supported: DWARF4 + LLDB, -O1
+// RUN: %clang_cc1 -emit-llvm -triple x86_64-linux-gnu \
+// RUN:   %s -o - -O1 -disable-llvm-passes -debugger-tuning=lldb \
+// RUN:   -debug-info-kind=standalone -dwarf-version=4 \
+// RUN: | FileCheck %s -check-prefix=HAS-ATTR \
+// RUN:     -implicit-check-not=DIFlagAllCallsDescribed
+
+// Unsupported: -O0
+// RUN: %clang_cc1 -emit-llvm -triple x86_64-linux-gnu \
+// RUN:   %s -o - -O0 -disable-llvm-passes -debugger-tuning=gdb \
+// RUN:   -debug-info-kind=standalone -dwarf-version=4 \
+// RUN: | FileCheck %s -check-prefix=NO-ATTR
+
+// Supported: DWARF4 + LLDB tuning, -O1, line-tables only DI
+// RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple %s -o - \
+// RUN:   -O1 -disable-llvm-passes \
+// RUN:   -debugger-tuning=lldb \
+// RUN:   -debug-info-kind=line-tables-only -dwarf-version=4 \
+// RUN: | FileCheck %s -check-prefix=LINE-TABLES-ONLY
+
+// Unsupported: -O0
+// RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple %s -o - \
+// RUN:   -O0 \
+// RUN:   -debug-info-kind=standalone -dwarf-version=5 \
+// RUN: | FileCheck %s -check-prefix=NO-ATTR
+
+// Unsupported: DWARF4
+// RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple %s -o - \
+// RUN:   -O1 -disable-llvm-passes \
+// RUN:   -debug-info-kind=standalone -dwarf-version=4 \
+// RUN: | FileCheck %s -check-prefix=NO-ATTR
+
+// NO-ATTR-NOT: FlagAllCallsDescribed
+
+// HAS-ATTR-DAG: DISubprogram(name: "declaration1", {{.*}}, spFlags: DISPFlagOptimized)
+// HAS-ATTR-DAG: DISubprogram(name: "declaration2", {{.*}}, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized 
+// HAS-ATTR-DAG: DISubprogram(name: "declaration3", {{.*}}, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+// HAS-ATTR-DAG: DISubprogram(name: "declaration4", {{.*}}, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized
+
+// HAS-ATTR-DAG: DISubprogram(name: "force_irgen", {{.*}}, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition
+
+// LINE-TABLES-ONLY: DISubprogram(name: "force_irgen", {{.*}}, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition
+
+void declaration1();
+
+void declaration2();
+
+void declaration2() {}
+
+void declaration3(void);
+
+void declaration4(void);
+
+void declaration4(void) {}
+
+void __attribute__((optnone)) force_irgen(void) {
+  declaration1();
+  declaration3();
+}