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Implement Lambda Conversion Operators for All CCs for MSVC.

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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
This commit is contained in:
Erich Keane 2020-11-02 07:43:45 -08:00
parent 1ec726f954
commit 6b104ea4b4
2 changed files with 60 additions and 7 deletions
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31
clang/lib/Sema/SemaLambda.cpp
View File

@ -1272,6 +1272,34 @@ static void repeatForLambdaConversionFunctionCallingConvs(
CallOpProto.isVariadic(), /*IsCXXMethod=*/true);
CallingConv CallOpCC = CallOpProto.getCallConv();
/// Implement emitting a version of the operator for many of the calling
/// conventions for MSVC, as described here:
/// https://devblogs.microsoft.com/oldnewthing/20150220-00/?p=44623.
/// Experimentally, we determined that cdecl, stdcall, fastcall, and
/// vectorcall are generated by MSVC when it is supported by the target.
/// Additionally, we are ensuring that the default-free/default-member and
/// call-operator calling convention are generated as well.
/// NOTE: We intentionally generate a 'thiscall' on Win32 implicitly from the
/// 'member default', despite MSVC not doing so. We do this in order to ensure
/// that someone who intentionally places 'thiscall' on the lambda call
/// operator will still get that overload, since we don't have the a way of
/// detecting the attribute by the time we get here.
if (S.getLangOpts().MSVCCompat) {
CallingConv Convs[] = {
CC_C, CC_X86StdCall, CC_X86FastCall, CC_X86VectorCall,
DefaultFree, DefaultMember, CallOpCC};
llvm::sort(Convs);
llvm::iterator_range<CallingConv *> Range(
std::begin(Convs), std::unique(std::begin(Convs), std::end(Convs)));
const TargetInfo &TI = S.getASTContext().getTargetInfo();
for (CallingConv C : Range) {
if (TI.checkCallingConvention(C) == TargetInfo::CCCR_OK)
F(C);
}
return;
}
if (CallOpCC == DefaultMember && DefaultMember != DefaultFree) {
F(DefaultFree);
F(DefaultMember);
@ -1475,9 +1503,6 @@ static void addFunctionPointerConversion(Sema &S, SourceRange IntroducerRange,
/// C++11 [expr.prim.lambda]p6. Note that in most cases, this should emit only a
/// single pointer conversion. In the event that the default calling convention
/// for free and member functions is different, it will emit both conventions.
/// FIXME: Implement emitting a version of the operator for EVERY calling
/// convention for MSVC, as described here:
/// https://devblogs.microsoft.com/oldnewthing/20150220-00/?p=44623.
static void addFunctionPointerConversions(Sema &S, SourceRange IntroducerRange,
CXXRecordDecl *Class,
CXXMethodDecl *CallOperator) {

36
clang/test/CodeGenCXX/lambda-conversion-op-cc.cpp
View File

@ -1,6 +1,6 @@
// 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 - -triple=i386-windows-pc -DWIN32 | FileCheck %s --check-prefixes=WIN32
// RUN: %clang_cc1 -emit-llvm %s -o - -fms-compatibility -triple=i386-windows-pc -DWIN32 | FileCheck %s --check-prefixes=WIN32
#ifndef CC
#define CC
@ -10,20 +10,36 @@ void usage() {
auto lambda = [](int i, float f, double d) CC { return i + f + d; };
double (*CC fp)(int, float, double) = lambda;
fp(0, 1.1, 2.2);
#ifdef WIN32
double (*__attribute__((thiscall)) fp2)(int, float, double) = lambda;
fp2(0, 1.1, 2.2);
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 convrsion operator.
// 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$_0cvPFdifdEEv"
@ -32,6 +48,12 @@ void usage() {
// WIN32: ret double (i32, float, double)* @"?__invoke@<lambda_0>@?0??usage@@YAXXZ@CA?A?<auto>@@HMN@Z"
// WIN32: define internal x86_thiscallcc double (i32, float, double)* @"??B<lambda_0>@?0??usage@@YAXXZ@QBEP6E?A?<auto>@@HMN@ZXZ"
// WIN32: ret double (i32, float, double)* @"?__invoke@<lambda_0>@?0??usage@@YAXXZ@CE?A?<auto>@@HMN@Z"
// WIN32: define internal x86_thiscallcc double (i32, float, double)* @"??B<lambda_0>@?0??usage@@YAXXZ@QBEP6G?A?<auto>@@HMN@ZXZ"
// WIN32: ret double (i32, float, double)* @"?__invoke@<lambda_0>@?0??usage@@YAXXZ@CG?A?<auto>@@HMN@Z"
// WIN32: define internal x86_thiscallcc double (i32, float, double)* @"??B<lambda_0>@?0??usage@@YAXXZ@QBEP6I?A?<auto>@@HMN@ZXZ"
// WIN32: ret double (i32, float, double)* @"?__invoke@<lambda_0>@?0??usage@@YAXXZ@CI?A?<auto>@@HMN@Z"
// WIN32: define internal x86_thiscallcc double (i32, float, double)* @"??B<lambda_0>@?0??usage@@YAXXZ@QBEP6Q?A?<auto>@@HMN@ZXZ"
// WIN32: ret double (i32, float, double)* @"?__invoke@<lambda_0>@?0??usage@@YAXXZ@CQ?A?<auto>@@HMN@Z"
//
// __invoke function, calls operator(). Win32 should call both.
// LIN64: define internal double @"_ZZ5usagevEN3$_08__invokeEifd"
@ -42,3 +64,9 @@ void usage() {
// 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"