ChuanqiXu updated this revision to Diff 397217.
ChuanqiXu added a comment.
Address comments.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D115790/new/
https://reviews.llvm.org/D115790
Files:
clang/lib/CodeGen/CGCoroutine.cpp
clang/test/CodeGenCoroutines/coro-always-inline.cpp
clang/test/CodeGenCoroutines/coro-attributes.cpp
llvm/docs/Coroutines.rst
llvm/lib/Transforms/Coroutines/CoroEarly.cpp
llvm/lib/Transforms/Coroutines/CoroInternal.h
llvm/test/Transforms/Coroutines/coro-async.ll
llvm/test/Transforms/Coroutines/coro-debug-O2.ll
llvm/test/Transforms/Coroutines/coro-debug-coro-frame.ll
llvm/test/Transforms/Coroutines/coro-debug-dbg.values-not_used_in_frame.ll
llvm/test/Transforms/Coroutines/coro-debug-dbg.values.ll
llvm/test/Transforms/Coroutines/coro-debug-frame-variable.ll
llvm/test/Transforms/Coroutines/coro-noalias-param.ll
llvm/test/Transforms/Coroutines/coro-split-01.ll
llvm/test/Transforms/Coroutines/coro-split-recursive.ll
llvm/test/Transforms/Coroutines/ex0.ll
llvm/test/Transforms/Coroutines/ex1.ll
llvm/test/Transforms/Coroutines/ex2.ll
llvm/test/Transforms/Coroutines/ex3.ll
llvm/test/Transforms/Coroutines/ex4.ll
llvm/test/Transforms/Coroutines/ex5.ll
llvm/test/Transforms/Coroutines/phi-coro-end.ll
llvm/test/Transforms/Coroutines/restart-trigger.ll
mlir/lib/Dialect/Async/Transforms/AsyncToAsyncRuntime.cpp
mlir/test/mlir-opt/async.mlir
Index: mlir/test/mlir-opt/async.mlir
===================================================================
--- /dev/null
+++ mlir/test/mlir-opt/async.mlir
@@ -0,0 +1,80 @@
+// Check if mlir marks the corresponding function with required coroutine attribute.
+//
+// RUN: mlir-opt %s -async-to-async-runtime \
+// RUN: -async-runtime-ref-counting \
+// RUN: -async-runtime-ref-counting-opt \
+// RUN: -convert-async-to-llvm \
+// RUN: -convert-linalg-to-loops \
+// RUN: -convert-scf-to-std \
+// RUN: -convert-linalg-to-llvm \
+// RUN: -convert-memref-to-llvm \
+// RUN: -convert-arith-to-llvm \
+// RUN: -convert-std-to-llvm \
+// RUN: -reconcile-unrealized-casts \
+// RUN: | FileCheck %s
+
+// CHECK: llvm.func @async_execute_fn{{.*}}attributes{{.*}}"coroutine.presplit", "0"
+// CHECK: llvm.func @async_execute_fn_0{{.*}}attributes{{.*}}"coroutine.presplit", "0"
+// CHECK: llvm.func @async_execute_fn_1{{.*}}attributes{{.*}}"coroutine.presplit", "0"
+
+func @main() {
+ %i0 = arith.constant 0 : index
+ %i1 = arith.constant 1 : index
+ %i2 = arith.constant 2 : index
+ %i3 = arith.constant 3 : index
+
+ %c0 = arith.constant 0.0 : f32
+ %c1 = arith.constant 1.0 : f32
+ %c2 = arith.constant 2.0 : f32
+ %c3 = arith.constant 3.0 : f32
+ %c4 = arith.constant 4.0 : f32
+
+ %A = memref.alloc() : memref<4xf32>
+ linalg.fill(%c0, %A) : f32, memref<4xf32>
+
+ %U = memref.cast %A : memref<4xf32> to memref<*xf32>
+ call @print_memref_f32(%U): (memref<*xf32>) -> ()
+
+ memref.store %c1, %A[%i0]: memref<4xf32>
+ call @mlirAsyncRuntimePrintCurrentThreadId(): () -> ()
+ call @print_memref_f32(%U): (memref<*xf32>) -> ()
+
+ %outer = async.execute {
+ memref.store %c2, %A[%i1]: memref<4xf32>
+ call @mlirAsyncRuntimePrintCurrentThreadId(): () -> ()
+ call @print_memref_f32(%U): (memref<*xf32>) -> ()
+
+ // No op async region to create a token for testing async dependency.
+ %noop = async.execute {
+ call @mlirAsyncRuntimePrintCurrentThreadId(): () -> ()
+ async.yield
+ }
+
+ %inner = async.execute [%noop] {
+ memref.store %c3, %A[%i2]: memref<4xf32>
+ call @mlirAsyncRuntimePrintCurrentThreadId(): () -> ()
+ call @print_memref_f32(%U): (memref<*xf32>) -> ()
+
+ async.yield
+ }
+ async.await %inner : !async.token
+
+ memref.store %c4, %A[%i3]: memref<4xf32>
+ call @mlirAsyncRuntimePrintCurrentThreadId(): () -> ()
+ call @print_memref_f32(%U): (memref<*xf32>) -> ()
+
+ async.yield
+ }
+ async.await %outer : !async.token
+
+ call @mlirAsyncRuntimePrintCurrentThreadId(): () -> ()
+ call @print_memref_f32(%U): (memref<*xf32>) -> ()
+
+ memref.dealloc %A : memref<4xf32>
+
+ return
+}
+
+func private @mlirAsyncRuntimePrintCurrentThreadId() -> ()
+
+func private @print_memref_f32(memref<*xf32>) attributes { llvm.emit_c_interface }
Index: mlir/lib/Dialect/Async/Transforms/AsyncToAsyncRuntime.cpp
===================================================================
--- mlir/lib/Dialect/Async/Transforms/AsyncToAsyncRuntime.cpp
+++ mlir/lib/Dialect/Async/Transforms/AsyncToAsyncRuntime.cpp
@@ -190,6 +190,14 @@
}
}
+ // The switch-resumed API based coroutine should be marked with
+ // "coroutine.presplit" attribute with value "0" to mark the function as a
+ // coroutine.
+ func->setAttr(
+ "passthrough",
+ builder.getArrayAttr(builder.getArrayAttr({builder.getStringAttr("coroutine.presplit"),
+ builder.getStringAttr("0")})));
+
CoroMachinery machinery;
machinery.func = func;
machinery.asyncToken = retToken;
Index: llvm/test/Transforms/Coroutines/restart-trigger.ll
===================================================================
--- llvm/test/Transforms/Coroutines/restart-trigger.ll
+++ llvm/test/Transforms/Coroutines/restart-trigger.ll
@@ -10,7 +10,7 @@
; CHECK-NEWPM-NOT: CoroSplit: Processing coroutine 'f' state: 1
-define void @f() {
+define void @f() "coroutine.presplit"="0" {
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%size = call i32 @llvm.coro.size.i32()
%alloc = call i8* @malloc(i32 %size)
Index: llvm/test/Transforms/Coroutines/phi-coro-end.ll
===================================================================
--- llvm/test/Transforms/Coroutines/phi-coro-end.ll
+++ llvm/test/Transforms/Coroutines/phi-coro-end.ll
@@ -1,7 +1,7 @@
; Verify that we correctly handle suspend when the coro.end block contains phi
; RUN: opt < %s -aa-pipeline=basic-aa -passes='default<O2>' -enable-coroutines -S | FileCheck %s
-define i8* @f(i32 %n) {
+define i8* @f(i32 %n) "coroutine.presplit"="0" {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%size = call i32 @llvm.coro.size.i32()
Index: llvm/test/Transforms/Coroutines/ex5.ll
===================================================================
--- llvm/test/Transforms/Coroutines/ex5.ll
+++ llvm/test/Transforms/Coroutines/ex5.ll
@@ -1,7 +1,7 @@
; Fifth example from Doc/Coroutines.rst (final suspend)
; RUN: opt < %s -aa-pipeline=basic-aa -passes='default<O2>' -enable-coroutines -preserve-alignment-assumptions-during-inlining=false -S | FileCheck %s
-define i8* @f(i32 %n) {
+define i8* @f(i32 %n) "coroutine.presplit"="0" {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%size = call i32 @llvm.coro.size.i32()
Index: llvm/test/Transforms/Coroutines/ex4.ll
===================================================================
--- llvm/test/Transforms/Coroutines/ex4.ll
+++ llvm/test/Transforms/Coroutines/ex4.ll
@@ -1,7 +1,7 @@
; Fourth example from Doc/Coroutines.rst (coroutine promise)
; RUN: opt < %s -passes='default<O2>' -enable-coroutines -S | FileCheck %s
-define i8* @f(i32 %n) {
+define i8* @f(i32 %n) "coroutine.presplit"="0" {
entry:
%promise = alloca i32
%pv = bitcast i32* %promise to i8*
Index: llvm/test/Transforms/Coroutines/ex3.ll
===================================================================
--- llvm/test/Transforms/Coroutines/ex3.ll
+++ llvm/test/Transforms/Coroutines/ex3.ll
@@ -1,7 +1,7 @@
; Third example from Doc/Coroutines.rst (two suspend points)
; RUN: opt < %s -aa-pipeline=basic-aa -passes='default<O2>' -enable-coroutines -S | FileCheck %s
-define i8* @f(i32 %n) {
+define i8* @f(i32 %n) "coroutine.presplit"="0" {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%size = call i32 @llvm.coro.size.i32()
Index: llvm/test/Transforms/Coroutines/ex2.ll
===================================================================
--- llvm/test/Transforms/Coroutines/ex2.ll
+++ llvm/test/Transforms/Coroutines/ex2.ll
@@ -1,7 +1,7 @@
; Second example from Doc/Coroutines.rst (custom alloc and free functions)
; RUN: opt < %s -passes='default<O2>' -enable-coroutines -S | FileCheck %s
-define i8* @f(i32 %n) {
+define i8* @f(i32 %n) "coroutine.presplit"="0" {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%need.dyn.alloc = call i1 @llvm.coro.alloc(token %id)
Index: llvm/test/Transforms/Coroutines/ex1.ll
===================================================================
--- llvm/test/Transforms/Coroutines/ex1.ll
+++ llvm/test/Transforms/Coroutines/ex1.ll
@@ -1,7 +1,7 @@
; First example from Doc/Coroutines.rst (one block loop)
; RUN: opt < %s -aa-pipeline=basic-aa -passes='default<O2>' -enable-coroutines -preserve-alignment-assumptions-during-inlining=false -S | FileCheck %s
-define i8* @f(i32 %n) {
+define i8* @f(i32 %n) "coroutine.presplit"="0" {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%size = call i32 @llvm.coro.size.i32()
Index: llvm/test/Transforms/Coroutines/ex0.ll
===================================================================
--- llvm/test/Transforms/Coroutines/ex0.ll
+++ llvm/test/Transforms/Coroutines/ex0.ll
@@ -1,7 +1,7 @@
; First example from Doc/Coroutines.rst (two block loop)
; RUN: opt < %s -enable-coroutines -aa-pipeline=basic-aa -passes='default<O2>' -preserve-alignment-assumptions-during-inlining=false -S | FileCheck %s
-define i8* @f(i32 %n) {
+define i8* @f(i32 %n) "coroutine.presplit"="0" {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%size = call i32 @llvm.coro.size.i32()
Index: llvm/test/Transforms/Coroutines/coro-split-recursive.ll
===================================================================
--- llvm/test/Transforms/Coroutines/coro-split-recursive.ll
+++ llvm/test/Transforms/Coroutines/coro-split-recursive.ll
@@ -13,7 +13,7 @@
; CHECK: call void @foo()
; CHECK-LABEL: define {{.*}}void @foo.destroy(
-define void @foo() {
+define void @foo() "coroutine.presplit"="0" {
entry:
%__promise = alloca i32, align 8
%0 = bitcast i32* %__promise to i8*
Index: llvm/test/Transforms/Coroutines/coro-split-01.ll
===================================================================
--- llvm/test/Transforms/Coroutines/coro-split-01.ll
+++ llvm/test/Transforms/Coroutines/coro-split-01.ll
@@ -1,7 +1,7 @@
; Tests that a coroutine is split, inlined into the caller and devirtualized.
; RUN: opt < %s -S -enable-coroutines -passes='default<O2>' | FileCheck %s
-define i8* @f() {
+define i8* @f() "coroutine.presplit"="0" {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%need.dyn.alloc = call i1 @llvm.coro.alloc(token %id)
Index: llvm/test/Transforms/Coroutines/coro-noalias-param.ll
===================================================================
--- llvm/test/Transforms/Coroutines/coro-noalias-param.ll
+++ llvm/test/Transforms/Coroutines/coro-noalias-param.ll
@@ -1,7 +1,7 @@
; RUN: opt < %s -S -passes=coro-early | FileCheck %s
%struct.A = type <{ i64, i64, i32, [4 x i8] }>
-define void @f(%struct.A* nocapture readonly noalias align 8 %a) {
+define void @f(%struct.A* nocapture readonly noalias align 8 %a) "coroutine.presplit"="0" {
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%size = call i32 @llvm.coro.size.i32()
%alloc = call i8* @malloc(i32 %size)
Index: llvm/test/Transforms/Coroutines/coro-debug-frame-variable.ll
===================================================================
--- llvm/test/Transforms/Coroutines/coro-debug-frame-variable.ll
+++ llvm/test/Transforms/Coroutines/coro-debug-frame-variable.ll
@@ -62,7 +62,7 @@
; CHECK: ![[IVAR_RESUME]] = !DILocalVariable(name: "i"
; CHECK: ![[JVAR_RESUME]] = !DILocalVariable(name: "j"
; CHECK: ![[JDBGLOC_RESUME]] = !DILocation(line: 32, column: 7, scope: ![[RESUME_SCOPE]])
-define void @f() {
+define void @f() "coroutine.presplit"="0" {
entry:
%__promise = alloca i8, align 8
%i = alloca i32, align 4
Index: llvm/test/Transforms/Coroutines/coro-debug-dbg.values.ll
===================================================================
--- llvm/test/Transforms/Coroutines/coro-debug-dbg.values.ll
+++ llvm/test/Transforms/Coroutines/coro-debug-dbg.values.ll
@@ -19,7 +19,7 @@
source_filename = "../llvm/test/Transforms/Coroutines/coro-debug-dbg.values-O2.ll"
declare void @consume(i32)
-define void @f(i32 %i, i32 %j) !dbg !8 {
+define void @f(i32 %i, i32 %j) "coroutine.presplit"="0" !dbg !8 {
entry:
%__promise = alloca i8, align 8
%x = alloca [10 x i32], align 16
Index: llvm/test/Transforms/Coroutines/coro-debug-dbg.values-not_used_in_frame.ll
===================================================================
--- llvm/test/Transforms/Coroutines/coro-debug-dbg.values-not_used_in_frame.ll
+++ llvm/test/Transforms/Coroutines/coro-debug-dbg.values-not_used_in_frame.ll
@@ -13,7 +13,7 @@
source_filename = "../llvm/test/Transforms/Coroutines/coro-debug-dbg.values-O2.ll"
-define void @f(i32 %i, i32 %j) !dbg !8 {
+define void @f(i32 %i, i32 %j) "coroutine.presplit"="0" !dbg !8 {
entry:
%__promise = alloca i8, align 8
%x = alloca [10 x i32], align 16
Index: llvm/test/Transforms/Coroutines/coro-debug-coro-frame.ll
===================================================================
--- llvm/test/Transforms/Coroutines/coro-debug-coro-frame.ll
+++ llvm/test/Transforms/Coroutines/coro-debug-coro-frame.ll
@@ -56,7 +56,7 @@
declare void @pi64(i64*)
declare void @pdouble(double*)
-define void @f(i32 %a, i32 %b, i64 %c, double %d) !dbg !8 {
+define void @f(i32 %a, i32 %b, i64 %c, double %d) "coroutine.presplit"="0" !dbg !8 {
entry:
%__promise = alloca %promise_type, align 8
%0 = bitcast %promise_type* %__promise to i8*
@@ -182,7 +182,7 @@
}
-define void @bar(i32 %a, i64 %c, double %d) !dbg !19 {
+define void @bar(i32 %a, i64 %c, double %d) "coroutine.presplit"="0" !dbg !19 {
entry:
%__promise = alloca %promise_type, align 8
%0 = bitcast %promise_type* %__promise to i8*
Index: llvm/test/Transforms/Coroutines/coro-debug-O2.ll
===================================================================
--- llvm/test/Transforms/Coroutines/coro-debug-O2.ll
+++ llvm/test/Transforms/Coroutines/coro-debug-O2.ll
@@ -9,7 +9,7 @@
; CHECK: ![[PROMISEVAR_RESUME]] = !DILocalVariable(name: "__promise"
%promise_type = type { i32, i32, double }
-define void @f() !dbg !8 {
+define void @f() "coroutine.presplit"="0" !dbg !8 {
entry:
%__promise = alloca %promise_type, align 8
%0 = bitcast %promise_type* %__promise to i8*
Index: llvm/test/Transforms/Coroutines/coro-async.ll
===================================================================
--- llvm/test/Transforms/Coroutines/coro-async.ll
+++ llvm/test/Transforms/Coroutines/coro-async.ll
@@ -61,7 +61,7 @@
}
-define swiftcc void @my_async_function(i8* swiftasync %async.ctxt, %async.task* %task, %async.actor* %actor) !dbg !1 {
+define swiftcc void @my_async_function(i8* swiftasync %async.ctxt, %async.task* %task, %async.actor* %actor) "coroutine.presplit"="1" !dbg !1 {
entry:
%tmp = alloca { i64, i64 }, align 8
%vector = alloca <4 x double>, align 16
@@ -203,7 +203,7 @@
i32 128 ; Initial async context size without space for frame
}>
-define swiftcc void @my_async_function2(%async.task* %task, %async.actor* %actor, i8* %async.ctxt) "frame-pointer"="all" !dbg !6 {
+define swiftcc void @my_async_function2(%async.task* %task, %async.actor* %actor, i8* %async.ctxt) "coroutine.presplit"="1" "frame-pointer"="all" !dbg !6 {
entry:
%id = call token @llvm.coro.id.async(i32 128, i32 16, i32 2, i8* bitcast (<{i32, i32}>* @my_async_function2_fp to i8*))
@@ -325,7 +325,7 @@
ret void
}
-define swiftcc void @dont_crash_on_cf(i8* %async.ctxt, %async.task* %task, %async.actor* %actor) {
+define swiftcc void @dont_crash_on_cf(i8* %async.ctxt, %async.task* %task, %async.actor* %actor) "coroutine.presplit"="1" {
entry:
%id = call token @llvm.coro.id.async(i32 128, i32 16, i32 0,
i8* bitcast (<{i32, i32}>* @dont_crash_on_cf_fp to i8*))
@@ -371,7 +371,7 @@
ret void
}
-define swiftcc void @multiple_coro_end_async(i8* %async.ctxt, %async.task* %task, %async.actor* %actor) {
+define swiftcc void @multiple_coro_end_async(i8* %async.ctxt, %async.task* %task, %async.actor* %actor) "coroutine.presplit"="1" {
entry:
%id = call token @llvm.coro.id.async(i32 128, i32 16, i32 0,
i8* bitcast (<{i32, i32}>* @dont_crash_on_cf_fp to i8*))
@@ -427,7 +427,7 @@
i32 64 ; Initial async context size without space for frame
}>
-define swiftcc void @polymorphic_suspend_return(i8* swiftasync %async.ctxt, %async.task* %task, %async.actor* %actor) {
+define swiftcc void @polymorphic_suspend_return(i8* swiftasync %async.ctxt, %async.task* %task, %async.actor* %actor) "coroutine.presplit"="1" {
entry:
%tmp = alloca { i64, i64 }, align 8
%proj.1 = getelementptr inbounds { i64, i64 }, { i64, i64 }* %tmp, i64 0, i32 0
@@ -496,7 +496,7 @@
i32 128 ; Initial async context size without space for frame
}>
-define swiftcc void @no_coro_suspend(i8* %async.ctx) {
+define swiftcc void @no_coro_suspend(i8* %async.ctx) "coroutine.presplit"="1" {
entry:
%some_alloca = alloca i64
%id = call token @llvm.coro.id.async(i32 128, i32 16, i32 0,
@@ -523,7 +523,7 @@
declare void @do_with_swifterror(i64** swifterror)
-define swiftcc void @no_coro_suspend_swifterror(i8* %async.ctx) {
+define swiftcc void @no_coro_suspend_swifterror(i8* %async.ctx) "coroutine.presplit"="1" {
entry:
%some_alloca = alloca swifterror i64*
%id = call token @llvm.coro.id.async(i32 128, i32 16, i32 0,
@@ -553,7 +553,7 @@
declare void @crash()
declare void @use(i8*)
-define swiftcc void @undefined_coro_async_resume(i8 *%async.ctx) {
+define swiftcc void @undefined_coro_async_resume(i8 *%async.ctx) "coroutine.presplit"="1" {
entry:
%id = call token @llvm.coro.id.async(i32 24, i32 16, i32 0, i8* bitcast (<{i32, i32}>* @undefined_coro_async_resume_fp to i8*))
%hdl = call i8* @llvm.coro.begin(token %id, i8* null)
Index: llvm/lib/Transforms/Coroutines/CoroInternal.h
===================================================================
--- llvm/lib/Transforms/Coroutines/CoroInternal.h
+++ llvm/lib/Transforms/Coroutines/CoroInternal.h
@@ -36,6 +36,11 @@
// adds coroutine subfunctions to the SCC to be processed by IPO pipeline.
// Async lowering similarily triggers a restart of the pipeline after it has
// split the coroutine.
+//
+// FIXME: Refactor these attributes as LLVM attributes instead of string
+// attributes since these attributes are already used outside LLVM's
+// coroutine module.
+// FIXME: Remove these values once we remove the Legacy PM.
#define CORO_PRESPLIT_ATTR "coroutine.presplit"
#define UNPREPARED_FOR_SPLIT "0"
#define PREPARED_FOR_SPLIT "1"
Index: llvm/lib/Transforms/Coroutines/CoroEarly.cpp
===================================================================
--- llvm/lib/Transforms/Coroutines/CoroEarly.cpp
+++ llvm/lib/Transforms/Coroutines/CoroEarly.cpp
@@ -176,11 +176,14 @@
lowerCoroNoop(cast<IntrinsicInst>(&I));
break;
case Intrinsic::coro_id:
- // Mark a function that comes out of the frontend that has a coro.id
- // with a coroutine attribute.
if (auto *CII = cast<CoroIdInst>(&I)) {
if (CII->getInfo().isPreSplit()) {
- F.addFnAttr(CORO_PRESPLIT_ATTR, UNPREPARED_FOR_SPLIT);
+ assert(F.hasFnAttribute(CORO_PRESPLIT_ATTR) &&
+ F.getFnAttribute(CORO_PRESPLIT_ATTR).getValueAsString() ==
+ UNPREPARED_FOR_SPLIT &&
+ "The frontend uses Swtich-Resumed ABI should emit "
+ "\"coroutine.presplit\" attribute with value \"0\" for the "
+ "coroutine.");
setCannotDuplicate(CII);
CII->setCoroutineSelf();
CoroId = cast<CoroIdInst>(&I);
@@ -190,6 +193,7 @@
case Intrinsic::coro_id_retcon:
case Intrinsic::coro_id_retcon_once:
case Intrinsic::coro_id_async:
+ // TODO: Remove the line once we support it in the corresponding frontend.
F.addFnAttr(CORO_PRESPLIT_ATTR, PREPARED_FOR_SPLIT);
break;
case Intrinsic::coro_resume:
Index: llvm/docs/Coroutines.rst
===================================================================
--- llvm/docs/Coroutines.rst
+++ llvm/docs/Coroutines.rst
@@ -1175,6 +1175,8 @@
A frontend should emit exactly one `coro.id` intrinsic per coroutine.
+A frontend should emit function attribute `"coroutine.presplit"` for the coroutine.
+
.. _coro.id.async:
'llvm.coro.id.async' Intrinsic
@@ -1214,6 +1216,8 @@
A frontend should emit exactly one `coro.id.async` intrinsic per coroutine.
+A frontend should emit function attribute `"coroutine.presplit"` for the coroutine.
+
.. _coro.id.retcon:
'llvm.coro.id.retcon' Intrinsic
@@ -1266,6 +1270,11 @@
The sixth argument must be a reference to a global function that will
be used to deallocate memory. It must take a pointer and return ``void``.
+Semantics:
+""""""""""
+
+A frontend should emit function attribute `"coroutine.presplit"` for the coroutine.
+
'llvm.coro.id.retcon.once' Intrinsic
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
::
@@ -1287,6 +1296,11 @@
continuation prototype must be `void` instead of matching the
coroutine's return type.
+Semantics:
+""""""""""
+
+A frontend should emit function attribute `"coroutine.presplit"` for the coroutine.
+
.. _coro.end:
'llvm.coro.end' Intrinsic
Index: clang/test/CodeGenCoroutines/coro-attributes.cpp
===================================================================
--- /dev/null
+++ clang/test/CodeGenCoroutines/coro-attributes.cpp
@@ -0,0 +1,20 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -std=c++20 -disable-llvm-passes -emit-llvm %s -o - | FileCheck %s
+#include "Inputs/coroutine.h"
+
+using namespace std;
+
+struct coro {
+ struct promise_type {
+ coro get_return_object();
+ suspend_never initial_suspend();
+ suspend_never final_suspend() noexcept;
+ void return_void();
+ static void unhandled_exception();
+ };
+};
+
+// CHECK: void @_Z3foov() #[[FOO_ATTR_NUM:[0-9]+]]
+// CHECK: attributes #[[FOO_ATTR_NUM]] = { {{.*}} "coroutine.presplit"="0"
+coro foo() {
+ co_await suspend_always{};
+}
Index: clang/test/CodeGenCoroutines/coro-always-inline.cpp
===================================================================
--- clang/test/CodeGenCoroutines/coro-always-inline.cpp
+++ clang/test/CodeGenCoroutines/coro-always-inline.cpp
@@ -48,3 +48,15 @@
// CHECK: [[CAST3:%[0-9]+]] = bitcast %"struct.std::awaitable"* %ref.tmp{{.*}} to i8*
// CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 1, i8* [[CAST3]])
void foo() { co_return; }
+
+// Check that bar is not inlined even it's marked as always_inline.
+
+// CHECK-LABEL: define {{.*}} void @_Z3bazv()
+// CHECK: call void @_Z3barv(
+__attribute__((__always_inline__)) void bar() {
+ co_return;
+}
+void baz() {
+ bar();
+ co_return;
+}
Index: clang/lib/CodeGen/CGCoroutine.cpp
===================================================================
--- clang/lib/CodeGen/CGCoroutine.cpp
+++ clang/lib/CodeGen/CGCoroutine.cpp
@@ -707,6 +707,10 @@
if (Stmt *Ret = S.getReturnStmt())
EmitStmt(Ret);
+
+ // LLVM require the frontend to add the function attribute. See
+ // Coroutines.rst.
+ CurFn->addFnAttr("coroutine.presplit", "0");
}
// Emit coroutine intrinsic and patch up arguments of the token type.
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