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[LLVM] Add a C API for creating instructions with custom syncscopes. #104775

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Aug 20, 2024
Merged

[LLVM] Add a C API for creating instructions with custom syncscopes. #104775

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a86400d
[LLVM] Add a C API for creating instructions with custom syncscopes.
maleadt Aug 19, 2024
0b9f075
Fix llvm-c-text to use the same context when cloning instructions.
maleadt Aug 19, 2024
0028d86
Address review comments.
maleadt Aug 19, 2024
ce5db1e
Make LLVMIsAtomicSingleThread work on non-atomic instructions.
maleadt Aug 19, 2024
b4ad3c6
Address review comments.
maleadt Aug 20, 2024
41aa204
Address more review comments.
maleadt Aug 20, 2024
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9 changes: 9 additions & 0 deletions llvm/docs/ReleaseNotes.rst
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Expand Up @@ -163,6 +163,15 @@ Changes to the C API
* It is now also possible to run the new pass manager on a single function, by calling
``LLVMRunPassesOnFunction`` instead of ``LLVMRunPasses``.

* Support for creating instructions with custom synchronization scopes has been added:

* ``LLVMGetSyncScopeID`` to map a synchronization scope name to an ID
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* ``LLVMBuildFenceSyncScope``, ``LLVMBuildAtomicRMWSyncScope`` and
``LLVMBuildAtomicCmpXchgSyncScope`` versions of the existing builder functions
with an additional synchronization scope ID parameter.
* ``LLVMGetAtomicSyncScopeID`` and ``LLVMSetAtomicSyncScopeID`` to get and set the
synchronization scope of any atomic instruction.

Changes to the CodeGen infrastructure
-------------------------------------

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34 changes: 34 additions & 0 deletions llvm/include/llvm-c/Core.h
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Expand Up @@ -646,6 +646,11 @@ unsigned LLVMGetMDKindIDInContext(LLVMContextRef C, const char *Name,
unsigned SLen);
unsigned LLVMGetMDKindID(const char *Name, unsigned SLen);

/**
* Maps a synchronization scope name to a ID unique within this context.
*/
unsigned LLVMGetSyncScopeID(LLVMContextRef C, const char *Name, size_t SLen);

/**
* Return an unique id given the name of a enum attribute,
* or 0 if no attribute by that name exists.
Expand Down Expand Up @@ -4578,15 +4583,28 @@ LLVMValueRef LLVMBuildPtrDiff2(LLVMBuilderRef, LLVMTypeRef ElemTy,
const char *Name);
LLVMValueRef LLVMBuildFence(LLVMBuilderRef B, LLVMAtomicOrdering ordering,
LLVMBool singleThread, const char *Name);
LLVMValueRef LLVMBuildFenceSyncScope(LLVMBuilderRef B,
LLVMAtomicOrdering ordering, unsigned SSID,
const char *Name);
LLVMValueRef LLVMBuildAtomicRMW(LLVMBuilderRef B, LLVMAtomicRMWBinOp op,
LLVMValueRef PTR, LLVMValueRef Val,
LLVMAtomicOrdering ordering,
LLVMBool singleThread);
LLVMValueRef LLVMBuildAtomicRMWSyncScope(LLVMBuilderRef B,
LLVMAtomicRMWBinOp op,
LLVMValueRef PTR, LLVMValueRef Val,
LLVMAtomicOrdering ordering,
unsigned SSID);
LLVMValueRef LLVMBuildAtomicCmpXchg(LLVMBuilderRef B, LLVMValueRef Ptr,
LLVMValueRef Cmp, LLVMValueRef New,
LLVMAtomicOrdering SuccessOrdering,
LLVMAtomicOrdering FailureOrdering,
LLVMBool SingleThread);
LLVMValueRef LLVMBuildAtomicCmpXchgSyncScope(LLVMBuilderRef B, LLVMValueRef Ptr,
LLVMValueRef Cmp, LLVMValueRef New,
LLVMAtomicOrdering SuccessOrdering,
LLVMAtomicOrdering FailureOrdering,
unsigned SSID);

/**
* Get the number of elements in the mask of a ShuffleVector instruction.
Expand All @@ -4611,6 +4629,22 @@ int LLVMGetMaskValue(LLVMValueRef ShuffleVectorInst, unsigned Elt);
LLVMBool LLVMIsAtomicSingleThread(LLVMValueRef AtomicInst);
void LLVMSetAtomicSingleThread(LLVMValueRef AtomicInst, LLVMBool SingleThread);

/**
* Returns whether an instruction is an atomic instruction, e.g., atomicrmw,
* cmpxchg, fence, or loads and stores with atomic ordering.
*/
LLVMBool LLVMIsAtomic(LLVMValueRef Inst);
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/**
* Returns the synchronization scope ID of an atomic instruction.
*/
unsigned LLVMGetAtomicSyncScopeID(LLVMValueRef AtomicInst);

/**
* Sets the synchronization scope ID of an atomic instruction.
*/
void LLVMSetAtomicSyncScopeID(LLVMValueRef AtomicInst, unsigned SSID);

LLVMAtomicOrdering LLVMGetCmpXchgSuccessOrdering(LLVMValueRef CmpXchgInst);
void LLVMSetCmpXchgSuccessOrdering(LLVMValueRef CmpXchgInst,
LLVMAtomicOrdering Ordering);
Expand Down
19 changes: 19 additions & 0 deletions llvm/include/llvm/IR/Instructions.h
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Expand Up @@ -4942,6 +4942,25 @@ inline std::optional<SyncScope::ID> getAtomicSyncScopeID(const Instruction *I) {
llvm_unreachable("unhandled atomic operation");
}

/// A helper function that sets an atomic operation's sync scope.
/// Does nothing if it is not an atomic operation.
inline void setAtomicSyncScopeID(Instruction *I, SyncScope::ID SSID) {
if (!I->isAtomic())
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return;
if (auto *AI = dyn_cast<LoadInst>(I))
AI->setSyncScopeID(SSID);
else if (auto *AI = dyn_cast<StoreInst>(I))
AI->setSyncScopeID(SSID);
else if (auto *AI = dyn_cast<FenceInst>(I))
AI->setSyncScopeID(SSID);
else if (auto *AI = dyn_cast<AtomicCmpXchgInst>(I))
AI->setSyncScopeID(SSID);
else if (auto *AI = dyn_cast<AtomicRMWInst>(I))
AI->setSyncScopeID(SSID);
else
llvm_unreachable("unhandled atomic operation");
}

//===----------------------------------------------------------------------===//
// FreezeInst Class
//===----------------------------------------------------------------------===//
Expand Down
79 changes: 55 additions & 24 deletions llvm/lib/IR/Core.cpp
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Expand Up @@ -24,6 +24,7 @@
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/LegacyPassManager.h"
Expand Down Expand Up @@ -146,6 +147,10 @@ unsigned LLVMGetMDKindID(const char *Name, unsigned SLen) {
return LLVMGetMDKindIDInContext(LLVMGetGlobalContext(), Name, SLen);
}

unsigned LLVMGetSyncScopeID(LLVMContextRef C, const char *Name, size_t SLen) {
return unwrap(C)->getOrInsertSyncScopeID(StringRef(Name, SLen));
}

unsigned LLVMGetEnumAttributeKindForName(const char *Name, size_t SLen) {
return Attribute::getAttrKindFromName(StringRef(Name, SLen));
}
Expand Down Expand Up @@ -3949,8 +3954,6 @@ static LLVMAtomicRMWBinOp mapToLLVMRMWBinOp(AtomicRMWInst::BinOp BinOp) {
llvm_unreachable("Invalid AtomicRMWBinOp value!");
}

// TODO: Should this and other atomic instructions support building with
// "syncscope"?
LLVMValueRef LLVMBuildFence(LLVMBuilderRef B, LLVMAtomicOrdering Ordering,
LLVMBool isSingleThread, const char *Name) {
return wrap(
Expand All @@ -3960,6 +3963,13 @@ LLVMValueRef LLVMBuildFence(LLVMBuilderRef B, LLVMAtomicOrdering Ordering,
Name));
}

LLVMValueRef LLVMBuildFenceSyncScope(LLVMBuilderRef B,
LLVMAtomicOrdering Ordering, unsigned SSID,
const char *Name) {
return wrap(
unwrap(B)->CreateFence(mapFromLLVMOrdering(Ordering), SSID, Name));
}

LLVMValueRef LLVMBuildGEP2(LLVMBuilderRef B, LLVMTypeRef Ty,
LLVMValueRef Pointer, LLVMValueRef *Indices,
unsigned NumIndices, const char *Name) {
Expand Down Expand Up @@ -4309,6 +4319,17 @@ LLVMValueRef LLVMBuildAtomicRMW(LLVMBuilderRef B,LLVMAtomicRMWBinOp op,
singleThread ? SyncScope::SingleThread : SyncScope::System));
}

LLVMValueRef LLVMBuildAtomicRMWSyncScope(LLVMBuilderRef B,
LLVMAtomicRMWBinOp op,
LLVMValueRef PTR, LLVMValueRef Val,
LLVMAtomicOrdering ordering,
unsigned SSID) {
AtomicRMWInst::BinOp intop = mapFromLLVMRMWBinOp(op);
return wrap(unwrap(B)->CreateAtomicRMW(intop, unwrap(PTR), unwrap(Val),
MaybeAlign(),
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Might as well not repeat past mistakes and also require an alignment argument for the new functions?

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Hmm, it seems weird to me to have a minor variant of an API taking different arguments like that. It'd be kinda awkward to wrap in LLVM.jl, where we support multiple versions of LLVM. Wouldn't it be better to keep the APIs similar and defer to LLVMSetAlignment for setting alignment?

mapFromLLVMOrdering(ordering), SSID));
}

LLVMValueRef LLVMBuildAtomicCmpXchg(LLVMBuilderRef B, LLVMValueRef Ptr,
LLVMValueRef Cmp, LLVMValueRef New,
LLVMAtomicOrdering SuccessOrdering,
Expand All @@ -4322,6 +4343,17 @@ LLVMValueRef LLVMBuildAtomicCmpXchg(LLVMBuilderRef B, LLVMValueRef Ptr,
singleThread ? SyncScope::SingleThread : SyncScope::System));
}

LLVMValueRef LLVMBuildAtomicCmpXchgSyncScope(LLVMBuilderRef B, LLVMValueRef Ptr,
LLVMValueRef Cmp, LLVMValueRef New,
LLVMAtomicOrdering SuccessOrdering,
LLVMAtomicOrdering FailureOrdering,
unsigned SSID) {
return wrap(unwrap(B)->CreateAtomicCmpXchg(
unwrap(Ptr), unwrap(Cmp), unwrap(New), MaybeAlign(),
mapFromLLVMOrdering(SuccessOrdering),
mapFromLLVMOrdering(FailureOrdering), SSID));
}

unsigned LLVMGetNumMaskElements(LLVMValueRef SVInst) {
Value *P = unwrap(SVInst);
ShuffleVectorInst *I = cast<ShuffleVectorInst>(P);
Expand All @@ -4336,34 +4368,33 @@ int LLVMGetMaskValue(LLVMValueRef SVInst, unsigned Elt) {

int LLVMGetUndefMaskElem(void) { return PoisonMaskElem; }

LLVMBool LLVMIsAtomicSingleThread(LLVMValueRef AtomicInst) {
Value *P = unwrap(AtomicInst);
LLVMBool LLVMIsAtomic(LLVMValueRef Inst) {
return unwrap<Instruction>(Inst)->isAtomic();
}

if (AtomicRMWInst *I = dyn_cast<AtomicRMWInst>(P))
return I->getSyncScopeID() == SyncScope::SingleThread;
else if (FenceInst *FI = dyn_cast<FenceInst>(P))
return FI->getSyncScopeID() == SyncScope::SingleThread;
else if (StoreInst *SI = dyn_cast<StoreInst>(P))
return SI->getSyncScopeID() == SyncScope::SingleThread;
else if (LoadInst *LI = dyn_cast<LoadInst>(P))
return LI->getSyncScopeID() == SyncScope::SingleThread;
return cast<AtomicCmpXchgInst>(P)->getSyncScopeID() ==
SyncScope::SingleThread;
LLVMBool LLVMIsAtomicSingleThread(LLVMValueRef AtomicInst) {
// Backwards compatibility: return false for non-atomic instructions
Instruction *I = unwrap<Instruction>(AtomicInst);
if (!I->isAtomic())
return 0;
return getAtomicSyncScopeID(I).value() == SyncScope::SingleThread;
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}

void LLVMSetAtomicSingleThread(LLVMValueRef AtomicInst, LLVMBool NewValue) {
Value *P = unwrap(AtomicInst);
SyncScope::ID SSID = NewValue ? SyncScope::SingleThread : SyncScope::System;
setAtomicSyncScopeID(unwrap<Instruction>(AtomicInst), SSID);
}

if (AtomicRMWInst *I = dyn_cast<AtomicRMWInst>(P))
return I->setSyncScopeID(SSID);
else if (FenceInst *FI = dyn_cast<FenceInst>(P))
return FI->setSyncScopeID(SSID);
else if (StoreInst *SI = dyn_cast<StoreInst>(P))
return SI->setSyncScopeID(SSID);
else if (LoadInst *LI = dyn_cast<LoadInst>(P))
return LI->setSyncScopeID(SSID);
return cast<AtomicCmpXchgInst>(P)->setSyncScopeID(SSID);
unsigned LLVMGetAtomicSyncScopeID(LLVMValueRef AtomicInst) {
Instruction *I = unwrap<Instruction>(AtomicInst);
assert(I->isAtomic() && "Expected an atomic instruction");
return getAtomicSyncScopeID(I).value();
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}

void LLVMSetAtomicSyncScopeID(LLVMValueRef AtomicInst, unsigned SSID) {
Instruction *I = unwrap<Instruction>(AtomicInst);
assert(I->isAtomic() && "Expected an atomic instruction");
setAtomicSyncScopeID(I, SSID);
}

LLVMAtomicOrdering LLVMGetCmpXchgSuccessOrdering(LLVMValueRef CmpXchgInst) {
Expand Down
18 changes: 13 additions & 5 deletions llvm/test/Bindings/llvm-c/echo.ll
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Expand Up @@ -216,15 +216,23 @@ define void @memops(ptr %ptr) {
%b = load volatile i8, ptr %ptr
%c = load i8, ptr %ptr, align 8
%d = load atomic i8, ptr %ptr acquire, align 32
%e = load atomic i8, ptr %ptr syncscope("singlethread") acquire, align 32
store i8 0, ptr %ptr
store volatile i8 0, ptr %ptr
store i8 0, ptr %ptr, align 8
store atomic i8 0, ptr %ptr release, align 32
%e = atomicrmw add ptr %ptr, i8 0 monotonic, align 1
%f = atomicrmw volatile xchg ptr %ptr, i8 0 acq_rel, align 8
%g = cmpxchg ptr %ptr, i8 1, i8 2 seq_cst acquire, align 1
%h = cmpxchg weak ptr %ptr, i8 1, i8 2 seq_cst acquire, align 8
%i = cmpxchg volatile ptr %ptr, i8 1, i8 2 monotonic monotonic, align 16
store atomic i8 0, ptr %ptr syncscope("singlethread") release, align 32
%f = atomicrmw add ptr %ptr, i8 0 monotonic, align 1
%g = atomicrmw volatile xchg ptr %ptr, i8 0 acq_rel, align 8
%h = atomicrmw volatile xchg ptr %ptr, i8 0 syncscope("singlethread") acq_rel, align 8
%i = atomicrmw volatile xchg ptr %ptr, i8 0 syncscope("agent") acq_rel, align 8
%j = cmpxchg ptr %ptr, i8 1, i8 2 seq_cst acquire, align 1
%k = cmpxchg weak ptr %ptr, i8 1, i8 2 seq_cst acquire, align 8
%l = cmpxchg volatile ptr %ptr, i8 1, i8 2 monotonic monotonic, align 16
%m = cmpxchg volatile ptr %ptr, i8 1, i8 2 syncscope("singlethread") monotonic monotonic, align 16
%n = cmpxchg volatile ptr %ptr, i8 1, i8 2 syncscope("agent") monotonic monotonic, align 16
fence syncscope("singlethread") acquire
fence syncscope("agent") acquire
ret void
}

Expand Down
4 changes: 2 additions & 2 deletions llvm/tools/llvm-c-test/attributes.c
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Expand Up @@ -20,7 +20,7 @@
int llvm_test_function_attributes(void) {
LLVMEnablePrettyStackTrace();

LLVMModuleRef M = llvm_load_module(false, true);
LLVMModuleRef M = llvm_load_module(LLVMGetGlobalContext(), false, true);

LLVMValueRef F = LLVMGetFirstFunction(M);
while (F) {
Expand Down Expand Up @@ -49,7 +49,7 @@ int llvm_test_function_attributes(void) {
int llvm_test_callsite_attributes(void) {
LLVMEnablePrettyStackTrace();

LLVMModuleRef M = llvm_load_module(false, true);
LLVMModuleRef M = llvm_load_module(LLVMGetGlobalContext(), false, true);

LLVMValueRef F = LLVMGetFirstFunction(M);
while (F) {
Expand Down
44 changes: 34 additions & 10 deletions llvm/tools/llvm-c-test/echo.cpp
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Expand Up @@ -520,6 +520,7 @@ struct FunCloner {
check_value_kind(Src, LLVMInstructionValueKind);
if (!LLVMIsAInstruction(Src))
report_fatal_error("Expected an instruction");
LLVMContextRef Ctx = LLVMGetTypeContext(LLVMTypeOf(Src));

size_t NameLen;
const char *Name = LLVMGetValueName2(Src, &NameLen);
Expand Down Expand Up @@ -754,7 +755,13 @@ struct FunCloner {
LLVMSetAlignment(Dst, LLVMGetAlignment(Src));
LLVMSetOrdering(Dst, LLVMGetOrdering(Src));
LLVMSetVolatile(Dst, LLVMGetVolatile(Src));
LLVMSetAtomicSingleThread(Dst, LLVMIsAtomicSingleThread(Src));
if (LLVMIsAtomic(Src)) {
LLVMBool IsAtomicSingleThread = LLVMIsAtomicSingleThread(Src);
if (IsAtomicSingleThread)
LLVMSetAtomicSingleThread(Dst, IsAtomicSingleThread);
else
LLVMSetAtomicSyncScopeID(Dst, LLVMGetAtomicSyncScopeID(Src));
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}
break;
}
case LLVMStore: {
Expand All @@ -764,7 +771,13 @@ struct FunCloner {
LLVMSetAlignment(Dst, LLVMGetAlignment(Src));
LLVMSetOrdering(Dst, LLVMGetOrdering(Src));
LLVMSetVolatile(Dst, LLVMGetVolatile(Src));
LLVMSetAtomicSingleThread(Dst, LLVMIsAtomicSingleThread(Src));
if (LLVMIsAtomic(Src)) {
LLVMBool IsAtomicSingleThread = LLVMIsAtomicSingleThread(Src);
if (IsAtomicSingleThread)
LLVMSetAtomicSingleThread(Dst, IsAtomicSingleThread);
else
LLVMSetAtomicSyncScopeID(Dst, LLVMGetAtomicSyncScopeID(Src));
}
break;
}
case LLVMGetElementPtr: {
Expand All @@ -786,7 +799,11 @@ struct FunCloner {
LLVMAtomicRMWBinOp BinOp = LLVMGetAtomicRMWBinOp(Src);
LLVMAtomicOrdering Ord = LLVMGetOrdering(Src);
LLVMBool SingleThread = LLVMIsAtomicSingleThread(Src);
Dst = LLVMBuildAtomicRMW(Builder, BinOp, Ptr, Val, Ord, SingleThread);
if (SingleThread)
Dst = LLVMBuildAtomicRMW(Builder, BinOp, Ptr, Val, Ord, SingleThread);
else
Dst = LLVMBuildAtomicRMWSyncScope(Builder, BinOp, Ptr, Val, Ord,
LLVMGetAtomicSyncScopeID(Src));
LLVMSetAlignment(Dst, LLVMGetAlignment(Src));
LLVMSetVolatile(Dst, LLVMGetVolatile(Src));
LLVMSetValueName2(Dst, Name, NameLen);
Expand All @@ -799,9 +816,13 @@ struct FunCloner {
LLVMAtomicOrdering Succ = LLVMGetCmpXchgSuccessOrdering(Src);
LLVMAtomicOrdering Fail = LLVMGetCmpXchgFailureOrdering(Src);
LLVMBool SingleThread = LLVMIsAtomicSingleThread(Src);

Dst = LLVMBuildAtomicCmpXchg(Builder, Ptr, Cmp, New, Succ, Fail,
SingleThread);
if (SingleThread)
Dst = LLVMBuildAtomicCmpXchg(Builder, Ptr, Cmp, New, Succ, Fail,
SingleThread);
else
Dst = LLVMBuildAtomicCmpXchgSyncScope(Builder, Ptr, Cmp, New, Succ,
Fail,
LLVMGetAtomicSyncScopeID(Src));
LLVMSetAlignment(Dst, LLVMGetAlignment(Src));
LLVMSetVolatile(Dst, LLVMGetVolatile(Src));
LLVMSetWeak(Dst, LLVMGetWeak(Src));
Expand Down Expand Up @@ -993,7 +1014,11 @@ struct FunCloner {
case LLVMFence: {
LLVMAtomicOrdering Ordering = LLVMGetOrdering(Src);
LLVMBool IsSingleThreaded = LLVMIsAtomicSingleThread(Src);
Dst = LLVMBuildFence(Builder, Ordering, IsSingleThreaded, Name);
if (IsSingleThreaded)
Dst = LLVMBuildFence(Builder, Ordering, IsSingleThreaded, Name);
else
Dst = LLVMBuildFenceSyncScope(Builder, Ordering,
LLVMGetAtomicSyncScopeID(Src), Name);
break;
}
case LLVMZExt: {
Expand Down Expand Up @@ -1059,7 +1084,6 @@ struct FunCloner {
if (LLVMCanValueUseFastMathFlags(Src))
LLVMSetFastMathFlags(Dst, LLVMGetFastMathFlags(Src));

auto Ctx = LLVMGetModuleContext(M);
size_t NumMetadataEntries;
auto *AllMetadata =
LLVMInstructionGetAllMetadataOtherThanDebugLoc(Src,
Expand Down Expand Up @@ -1609,12 +1633,12 @@ static void clone_symbols(LLVMModuleRef Src, LLVMModuleRef M) {
int llvm_echo(void) {
LLVMEnablePrettyStackTrace();

LLVMModuleRef Src = llvm_load_module(false, true);
LLVMContextRef Ctx = LLVMContextCreate();
LLVMModuleRef Src = llvm_load_module(Ctx, false, true);
size_t SourceFileLen;
const char *SourceFileName = LLVMGetSourceFileName(Src, &SourceFileLen);
size_t ModuleIdentLen;
const char *ModuleName = LLVMGetModuleIdentifier(Src, &ModuleIdentLen);
LLVMContextRef Ctx = LLVMContextCreate();
LLVMModuleRef M = LLVMModuleCreateWithNameInContext(ModuleName, Ctx);

LLVMSetSourceFileName(M, SourceFileName, SourceFileLen);
Expand Down
2 changes: 1 addition & 1 deletion llvm/tools/llvm-c-test/llvm-c-test.h
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Expand Up @@ -24,7 +24,7 @@ extern "C" {
void llvm_tokenize_stdin(void (*cb)(char **tokens, int ntokens));

// module.c
LLVMModuleRef llvm_load_module(bool Lazy, bool New);
LLVMModuleRef llvm_load_module(LLVMContextRef C, bool Lazy, bool New);
int llvm_module_dump(bool Lazy, bool New);
int llvm_module_list_functions(void);
int llvm_module_list_globals(void);
Expand Down
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