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llvm-project/clang/test/CodeGenCXX/lambda-conversion-op-cc.cpp
Erich Keane 6b104ea4b4 Implement Lambda Conversion Operators for All CCs for MSVC. 
As described here:
https://devblogs.microsoft.com/oldnewthing/20150220-00/?p=44623

In order to allow Lambdas to be used with traditional Win32 APIs, they
emit a conversion function for (what Raymond Chen claims is all) a
number of the calling conventions.  Through experimentation, we
discovered that the list isn't quite 'all'.

This patch implements this by taking the list of conversions that MSVC
emits (across 'all' architectures, I don't see any CCs on ARM), then
emits them if they are supported by the current target.

However, we also add 3 other options (which may be duplicates):
free-function, member-function, and operator() calling conventions.  We
do this because we have an extension where we generate both free and
member for these cases so th at people specifying a calling convention
on the lambda will have the expected behavior when specifying one of
those two.

MSVC doesn't seem to permit specifying calling-convention on lambdas,
but we do, so we need to make sure those are emitted as well. We do this
so that clang-only conventions are supported if the user specifies them.

Differential Revision: https://reviews.llvm.org/D90634
2020-11-05 07:25:44 -08:00

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// RUN: %clang_cc1 -emit-llvm %s -o - -triple=x86_64-linux-gnu | FileCheck %s --check-prefixes=CHECK,LIN64
// RUN: %clang_cc1 -emit-llvm %s -o - -triple=x86_64-linux-gnu -DCC="__attribute__((vectorcall))" | FileCheck %s --check-prefixes=CHECK,VECCALL
// RUN: %clang_cc1 -emit-llvm %s -o - -fms-compatibility -triple=i386-windows-pc -DWIN32 | FileCheck %s --check-prefixes=WIN32
#ifndef CC
#define CC
#endif
void usage() {
auto lambda = [](int i, float f, double d) CC { return i + f + d; };
double (*CC fp)(int, float, double) = lambda;
#ifdef WIN32
double (*__attribute__((thiscall)) fp2)(int, float, double) = lambda;
double (*__attribute__((stdcall)) fp3)(int, float, double) = lambda;
double (*__attribute__((fastcall)) fp4)(int, float, double) = lambda;
double (*__attribute__((vectorcall)) fp5)(int, float, double) = lambda;
#endif // WIN32
fp(0, 1.1, 2.2);
#ifdef WIN32
fp2(0, 1.1, 2.2);
fp3(0, 1.1, 2.2);
fp4(0, 1.1, 2.2);
fp5(0, 1.1, 2.2);
#endif // WIN32
auto x = +lambda;
}
// void usage function, calls conversion operator.
// LIN64: define void @_Z5usagev()
// VECCALL: define void @_Z5usagev()
// WIN32: define dso_local void @"?usage@@YAXXZ"()
// CHECK: call double (i32, float, double)* @"_ZZ5usagevENK3$_0cvPFdifdEEv"
// WIN32: call x86_thiscallcc double (i32, float, double)* @"??B<lambda_0>@?0??usage@@YAXXZ@QBEP6A?A?<auto>@@HMN@ZXZ"
// WIN32: call x86_thiscallcc double (i32, float, double)* @"??B<lambda_0>@?0??usage@@YAXXZ@QBEP6E?A?<auto>@@HMN@ZXZ"
// WIN32: call x86_thiscallcc double (i32, float, double)* @"??B<lambda_0>@?0??usage@@YAXXZ@QBEP6G?A?<auto>@@HMN@ZXZ"
// WIN32: call x86_thiscallcc double (i32, float, double)* @"??B<lambda_0>@?0??usage@@YAXXZ@QBEP6I?A?<auto>@@HMN@ZXZ"
// WIN32: call x86_thiscallcc double (i32, float, double)* @"??B<lambda_0>@?0??usage@@YAXXZ@QBEP6Q?A?<auto>@@HMN@ZXZ"
// Operator+ calls 'default' calling convention.
// CHECK: call double (i32, float, double)* @"_ZZ5usagevENK3$_0cvPFdifdEEv"
// WIN32: call x86_thiscallcc double (i32, float, double)* @"??B<lambda_0>@?0??usage@@YAXXZ@QBEP6A?A?<auto>@@HMN@ZXZ"
//
// Conversion operator, returns __invoke.
// CHECK: define internal double (i32, float, double)* @"_ZZ5usagevENK3$_0cvPFdifdEEv"
// CHECK: ret double (i32, float, double)* @"_ZZ5usagevEN3$_08__invokeEifd"
// WIN32: define internal x86_thiscallcc double (i32, float, double)* @"??B<lambda_0>@?0??usage@@YAXXZ@QBEP6A?A?<auto>@@HMN@ZXZ"
// WIN32: ret double (i32, float, double)* @"?__invoke@<lambda_0>@?0??usage@@YAXXZ@CA?A?<auto>@@HMN@Z"
// WIN32: define internal x86_thiscallcc double (i32, float, double)* @"??B<lambda_0>@?0??usage@@YAXXZ@QBEP6E?A?<auto>@@HMN@ZXZ"
// WIN32: ret double (i32, float, double)* @"?__invoke@<lambda_0>@?0??usage@@YAXXZ@CE?A?<auto>@@HMN@Z"
// WIN32: define internal x86_thiscallcc double (i32, float, double)* @"??B<lambda_0>@?0??usage@@YAXXZ@QBEP6G?A?<auto>@@HMN@ZXZ"
// WIN32: ret double (i32, float, double)* @"?__invoke@<lambda_0>@?0??usage@@YAXXZ@CG?A?<auto>@@HMN@Z"
// WIN32: define internal x86_thiscallcc double (i32, float, double)* @"??B<lambda_0>@?0??usage@@YAXXZ@QBEP6I?A?<auto>@@HMN@ZXZ"
// WIN32: ret double (i32, float, double)* @"?__invoke@<lambda_0>@?0??usage@@YAXXZ@CI?A?<auto>@@HMN@Z"
// WIN32: define internal x86_thiscallcc double (i32, float, double)* @"??B<lambda_0>@?0??usage@@YAXXZ@QBEP6Q?A?<auto>@@HMN@ZXZ"
// WIN32: ret double (i32, float, double)* @"?__invoke@<lambda_0>@?0??usage@@YAXXZ@CQ?A?<auto>@@HMN@Z"
//
// __invoke function, calls operator(). Win32 should call both.
// LIN64: define internal double @"_ZZ5usagevEN3$_08__invokeEifd"
// LIN64: call double @"_ZZ5usagevENK3$_0clEifd"
// VECCALL: define internal x86_vectorcallcc double @"_ZZ5usagevEN3$_08__invokeEifd"
// VECCALL: call x86_vectorcallcc double @"_ZZ5usagevENK3$_0clEifd"
// WIN32: define internal double @"?__invoke@<lambda_0>@?0??usage@@YAXXZ@CA?A?<auto>@@HMN@Z"
// WIN32: call x86_thiscallcc double @"??R<lambda_0>@?0??usage@@YAXXZ@QBE?A?<auto>@@HMN@Z"
// WIN32: define internal x86_thiscallcc double @"?__invoke@<lambda_0>@?0??usage@@YAXXZ@CE?A?<auto>@@HMN@Z"
// WIN32: call x86_thiscallcc double @"??R<lambda_0>@?0??usage@@YAXXZ@QBE?A?<auto>@@HMN@Z"
// WIN32: define internal x86_stdcallcc double @"?__invoke@<lambda_0>@?0??usage@@YAXXZ@CG?A?<auto>@@HMN@Z"
// WIN32: call x86_thiscallcc double @"??R<lambda_0>@?0??usage@@YAXXZ@QBE?A?<auto>@@HMN@Z"
// WIN32: define internal x86_fastcallcc double @"?__invoke@<lambda_0>@?0??usage@@YAXXZ@CI?A?<auto>@@HMN@Z"
// WIN32: call x86_thiscallcc double @"??R<lambda_0>@?0??usage@@YAXXZ@QBE?A?<auto>@@HMN@Z"
// WIN32: define internal x86_vectorcallcc double @"?__invoke@<lambda_0>@?0??usage@@YAXXZ@CQ?A?<auto>@@HMN@Z"
// WIN32: call x86_thiscallcc double @"??R<lambda_0>@?0??usage@@YAXXZ@QBE?A?<auto>@@HMN@Z"
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