https://github.com/kikairoya created https://github.com/llvm/llvm-project/pull/158385
Cygwin should support calling convention attributes `__cdecl`, `__stdcall`, `__thiscall`, `__fastcall`, and `__vectorcall`, even though they have no effect in x86_64 except `__vectorcall`, as done in MinGW. Originally reported in https://cygwin.com/pipermail/cygwin/2025-September/258782.html >From c6dd0311d579abe0eca0f8f5e1ab9d2f8f9db18c Mon Sep 17 00:00:00 2001 From: kikairoya <[email protected]> Date: Fri, 12 Sep 2025 21:56:19 +0900 Subject: [PATCH 1/2] set calling conv list --- clang/lib/Basic/Targets/X86.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/clang/lib/Basic/Targets/X86.h b/clang/lib/Basic/Targets/X86.h index 6e013c95dbf01..d261540040e46 100644 --- a/clang/lib/Basic/Targets/X86.h +++ b/clang/lib/Basic/Targets/X86.h @@ -983,6 +983,7 @@ class LLVM_LIBRARY_VISIBILITY CygwinX86_64TargetInfo : public X86_64TargetInfo { : X86_64TargetInfo(Triple, Opts) { this->WCharType = TargetInfo::UnsignedShort; this->WIntType = TargetInfo::UnsignedInt; + this->UseMicrosoftManglingForC = true; } void getTargetDefines(const LangOptions &Opts, @@ -997,9 +998,37 @@ class LLVM_LIBRARY_VISIBILITY CygwinX86_64TargetInfo : public X86_64TargetInfo { Builder.defineMacro("_GNU_SOURCE"); } + CallingConvCheckResult checkCallingConvention(CallingConv CC) const override { + switch (CC) { + case CC_X86StdCall: + case CC_X86ThisCall: + case CC_X86FastCall: + return CCCR_Ignore; + case CC_C: + case CC_X86VectorCall: + case CC_IntelOclBicc: + case CC_PreserveMost: + case CC_PreserveAll: + case CC_PreserveNone: + case CC_X86_64SysV: + case CC_Swift: + case CC_SwiftAsync: + case CC_X86RegCall: + case CC_DeviceKernel: + return CCCR_OK; + default: + return CCCR_Warning; + } + } + BuiltinVaListKind getBuiltinVaListKind() const override { return TargetInfo::CharPtrBuiltinVaList; } + + TargetInfo::CallingConvKind + getCallingConvKind(bool ClangABICompat4) const override { + return CCK_MicrosoftWin64; + } }; class LLVM_LIBRARY_VISIBILITY DarwinX86_64TargetInfo >From 090635650aa436f93c540a6d580becbffb149097 Mon Sep 17 00:00:00 2001 From: kikairoya <[email protected]> Date: Sat, 13 Sep 2025 08:19:42 +0900 Subject: [PATCH 2/2] stdcall test --- clang/test/CodeGen/calling-conv-ignored.c | 2 ++ clang/test/CodeGen/ms_abi.c | 2 ++ clang/test/CodeGen/sysv_abi.c | 4 ++++ clang/test/DebugInfo/Generic/cc.c | 6 ++++-- clang/test/Parser/x64-windows-calling-convention-handling.c | 4 +++- clang/test/Sema/MicrosoftCompatibility-x64.c | 4 +++- 6 files changed, 18 insertions(+), 4 deletions(-) diff --git a/clang/test/CodeGen/calling-conv-ignored.c b/clang/test/CodeGen/calling-conv-ignored.c index 9c47f641eaacb..5dbc7e4084c88 100644 --- a/clang/test/CodeGen/calling-conv-ignored.c +++ b/clang/test/CodeGen/calling-conv-ignored.c @@ -1,5 +1,7 @@ // RUN: %clang_cc1 -triple i686-windows-msvc -emit-llvm -o - %s | FileCheck %s --check-prefix=X86 // RUN: %clang_cc1 -triple x86_64-windows-msvc -emit-llvm -o - %s | FileCheck %s --check-prefix=X64 +// RUN: %clang_cc1 -triple x86_64-windows-gnu -emit-llvm -o - %s | FileCheck %s --check-prefix=X64 +// RUN: %clang_cc1 -triple x86_64-cygwin -emit-llvm -o - %s | FileCheck %s --check-prefix=X64 // RUN: %clang_cc1 -triple i686-windows-msvc -emit-llvm -o - %s -fdefault-calling-conv=vectorcall | FileCheck %s --check-prefix=X86-VEC // RUN: %clang_cc1 -triple x86_64-windows-msvc -emit-llvm -o - %s -fdefault-calling-conv=vectorcall | FileCheck %s --check-prefix=X64-VEC diff --git a/clang/test/CodeGen/ms_abi.c b/clang/test/CodeGen/ms_abi.c index 5d58c9816da78..2047febabdb11 100644 --- a/clang/test/CodeGen/ms_abi.c +++ b/clang/test/CodeGen/ms_abi.c @@ -1,5 +1,7 @@ // RUN: %clang_cc1 -triple x86_64-unknown-freebsd10.0 -emit-llvm < %s | FileCheck -check-prefix=FREEBSD %s // RUN: %clang_cc1 -triple x86_64-pc-win32 -emit-llvm < %s | FileCheck -check-prefix=WIN64 %s +// RUN: %clang_cc1 -triple x86_64-mingw -emit-llvm < %s | FileCheck -check-prefix=WIN64 %s +// RUN: %clang_cc1 -triple x86_64-cygwin -emit-llvm < %s | FileCheck -check-prefix=WIN64 %s // RUN: %clang_cc1 -triple x86_64-uefi -emit-llvm < %s | FileCheck -check-prefix=WIN64 %s struct foo { diff --git a/clang/test/CodeGen/sysv_abi.c b/clang/test/CodeGen/sysv_abi.c index 29ea819c2aa26..a66ecc6e26242 100644 --- a/clang/test/CodeGen/sysv_abi.c +++ b/clang/test/CodeGen/sysv_abi.c @@ -1,7 +1,11 @@ // RUN: %clang_cc1 -triple x86_64-pc-win32 -emit-llvm -target-cpu skylake-avx512 < %s | FileCheck %s --check-prefixes=CHECK,AVX +// RUN: %clang_cc1 -triple x86_64-mingw -emit-llvm -target-cpu skylake-avx512 < %s | FileCheck %s --check-prefixes=CHECK,AVX +// RUN: %clang_cc1 -triple x86_64-cygwin -emit-llvm -target-cpu skylake-avx512 < %s | FileCheck %s --check-prefixes=CHECK,AVX // RUN: %clang_cc1 -triple x86_64-linux -emit-llvm -target-cpu skylake-avx512 < %s | FileCheck %s --check-prefixes=CHECK,AVX // RUN: %clang_cc1 -triple x86_64-uefi -emit-llvm -target-cpu skylake-avx512 < %s | FileCheck %s --check-prefixes=CHECK,AVX // RUN: %clang_cc1 -triple x86_64-pc-win32 -emit-llvm < %s | FileCheck %s --check-prefixes=CHECK,NOAVX +// RUN: %clang_cc1 -triple x86_64-mingw -emit-llvm < %s | FileCheck %s --check-prefixes=CHECK,NOAVX +// RUN: %clang_cc1 -triple x86_64-cygwin -emit-llvm < %s | FileCheck %s --check-prefixes=CHECK,NOAVX // RUN: %clang_cc1 -triple x86_64-linux -emit-llvm < %s | FileCheck %s --check-prefixes=CHECK,NOAVX // RUN: %clang_cc1 -triple x86_64-uefi -emit-llvm < %s | FileCheck %s --check-prefixes=CHECK,NOAVX diff --git a/clang/test/DebugInfo/Generic/cc.c b/clang/test/DebugInfo/Generic/cc.c index 2bfb1c28e9353..e430e4c8ed87b 100644 --- a/clang/test/DebugInfo/Generic/cc.c +++ b/clang/test/DebugInfo/Generic/cc.c @@ -1,5 +1,7 @@ // RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -o - -emit-llvm -debug-info-kind=limited %s | FileCheck %s --check-prefix=LINUX -// RUN: %clang_cc1 -triple x86_64-unknown-windows-msvc -o - -emit-llvm -debug-info-kind=limited %s | FileCheck %s --check-prefix=WINDOWS +// RUN: %clang_cc1 -triple x86_64-unknown-windows-msvc -o - -emit-llvm -debug-info-kind=limited %s | FileCheck %s --check-prefix=WINDOWS +// RUN: %clang_cc1 -triple x86_64-unknown-windows-gnu -o - -emit-llvm -debug-info-kind=limited %s | FileCheck %s --check-prefix=WINDOWS +// RUN: %clang_cc1 -triple x86_64-unknown-windows-cygnus -o - -emit-llvm -debug-info-kind=limited %s | FileCheck %s --check-prefix=WINDOWS // RUN: %clang_cc1 -triple i386-pc-linux-gnu -o - -emit-llvm -debug-info-kind=limited %s | FileCheck %s --check-prefix=LINUX32 // RUN: %clang_cc1 -triple armv7--linux-gnueabihf -o - -emit-llvm -debug-info-kind=limited %s | FileCheck %s --check-prefix=ARM @@ -77,7 +79,7 @@ __attribute__((intel_ocl_bicc)) int add_inteloclbicc(int a, int b) { } #endif -#ifdef _WIN64 +#if defined(_WIN64) || defined(__CYGWIN__) // WINDOWS: !DISubprogram({{.*}}"add_sysvabi", {{.*}}type: ![[FTY:[0-9]+]] // WINDOWS: ![[FTY]] = !DISubroutineType({{.*}}cc: DW_CC_LLVM_X86_64SysV, __attribute__((sysv_abi)) int add_sysvabi(int a, int b) { diff --git a/clang/test/Parser/x64-windows-calling-convention-handling.c b/clang/test/Parser/x64-windows-calling-convention-handling.c index c027663414829..224931c4eb91d 100644 --- a/clang/test/Parser/x64-windows-calling-convention-handling.c +++ b/clang/test/Parser/x64-windows-calling-convention-handling.c @@ -1,4 +1,6 @@ -// RUN: %clang_cc1 -triple x86_64-windows -fms-compatibility -fsyntax-only -verify %s +// RUN: %clang_cc1 -triple x86_64-windows -fsyntax-only -verify %s +// RUN: %clang_cc1 -triple x86_64-mingw -fsyntax-only -verify %s +// RUN: %clang_cc1 -triple x86_64-cygwin -fsyntax-only -verify %s int __cdecl cdecl(int a, int b, int c, int d) { // expected-no-diagnostics return a + b + c + d; diff --git a/clang/test/Sema/MicrosoftCompatibility-x64.c b/clang/test/Sema/MicrosoftCompatibility-x64.c index 7d1f64996eb3c..a422b549dcc00 100644 --- a/clang/test/Sema/MicrosoftCompatibility-x64.c +++ b/clang/test/Sema/MicrosoftCompatibility-x64.c @@ -1,4 +1,6 @@ -// RUN: %clang_cc1 %s -Wmicrosoft -verify -fms-compatibility -triple x86_64-pc-win32 +// RUN: %clang_cc1 %s -Wmicrosoft -verify -triple x86_64-pc-win32 +// RUN: %clang_cc1 %s -Wmicrosoft -verify -triple x86_64-w64-mingw32 +// RUN: %clang_cc1 %s -Wmicrosoft -verify -triple x86_64-pc-cygwin // None of these should warn. stdcall is treated as equivalent to cdecl on // x64. _______________________________________________ cfe-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
