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CGBuiltin.cpp
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//===---- CGBuiltin.cpp - Emit LLVM Code for builtins ---------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This contains code to emit Builtin calls as LLVM code.
//
//===----------------------------------------------------------------------===//
#include "CGBuiltin.h"
#include "ABIInfo.h"
#include "CGCUDARuntime.h"
#include "CGCXXABI.h"
#include "CGDebugInfo.h"
#include "CGObjCRuntime.h"
#include "CGOpenCLRuntime.h"
#include "CGPointerAuthInfo.h"
#include "CGRecordLayout.h"
#include "CGValue.h"
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "ConstantEmitter.h"
#include "PatternInit.h"
#include "TargetInfo.h"
#include "clang/AST/OSLog.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Basic/TargetBuiltins.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Basic/TargetOptions.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/IntrinsicsX86.h"
#include "llvm/IR/MatrixBuilder.h"
#include "llvm/Support/ConvertUTF.h"
#include "llvm/Support/ScopedPrinter.h"
#include <optional>
#include <utility>
using namespace clang;
using namespace CodeGen;
using namespace llvm;
static Value *EmitTargetArchBuiltinExpr(CodeGenFunction *CGF,
unsigned BuiltinID, const CallExpr *E,
ReturnValueSlot ReturnValue,
llvm::Triple::ArchType Arch) {
// When compiling in HipStdPar mode we have to be conservative in rejecting
// target specific features in the FE, and defer the possible error to the
// AcceleratorCodeSelection pass, wherein iff an unsupported target builtin is
// referenced by an accelerator executable function, we emit an error.
// Returning nullptr here leads to the builtin being handled in
// EmitStdParUnsupportedBuiltin.
if (CGF->getLangOpts().HIPStdPar && CGF->getLangOpts().CUDAIsDevice &&
Arch != CGF->getTarget().getTriple().getArch())
return nullptr;
switch (Arch) {
case llvm::Triple::arm:
case llvm::Triple::armeb:
case llvm::Triple::thumb:
case llvm::Triple::thumbeb:
return CGF->EmitARMBuiltinExpr(BuiltinID, E, ReturnValue, Arch);
case llvm::Triple::aarch64:
case llvm::Triple::aarch64_32:
case llvm::Triple::aarch64_be:
return CGF->EmitAArch64BuiltinExpr(BuiltinID, E, Arch);
case llvm::Triple::bpfeb:
case llvm::Triple::bpfel:
return CGF->EmitBPFBuiltinExpr(BuiltinID, E);
case llvm::Triple::dxil:
return CGF->EmitDirectXBuiltinExpr(BuiltinID, E);
case llvm::Triple::x86:
case llvm::Triple::x86_64:
return CGF->EmitX86BuiltinExpr(BuiltinID, E);
case llvm::Triple::ppc:
case llvm::Triple::ppcle:
case llvm::Triple::ppc64:
case llvm::Triple::ppc64le:
return CGF->EmitPPCBuiltinExpr(BuiltinID, E);
case llvm::Triple::r600:
case llvm::Triple::amdgcn:
return CGF->EmitAMDGPUBuiltinExpr(BuiltinID, E);
case llvm::Triple::systemz:
return CGF->EmitSystemZBuiltinExpr(BuiltinID, E);
case llvm::Triple::nvptx:
case llvm::Triple::nvptx64:
return CGF->EmitNVPTXBuiltinExpr(BuiltinID, E);
case llvm::Triple::wasm32:
case llvm::Triple::wasm64:
return CGF->EmitWebAssemblyBuiltinExpr(BuiltinID, E);
case llvm::Triple::hexagon:
return CGF->EmitHexagonBuiltinExpr(BuiltinID, E);
case llvm::Triple::riscv32:
case llvm::Triple::riscv64:
return CGF->EmitRISCVBuiltinExpr(BuiltinID, E, ReturnValue);
case llvm::Triple::spirv:
return CGF->EmitSPIRVBuiltinExpr(BuiltinID, E);
case llvm::Triple::spirv64:
if (CGF->getTarget().getTriple().getOS() != llvm::Triple::OSType::AMDHSA)
return nullptr;
return CGF->EmitAMDGPUBuiltinExpr(BuiltinID, E);
default:
return nullptr;
}
}
Value *CodeGenFunction::EmitTargetBuiltinExpr(unsigned BuiltinID,
const CallExpr *E,
ReturnValueSlot ReturnValue) {
if (getContext().BuiltinInfo.isAuxBuiltinID(BuiltinID)) {
assert(getContext().getAuxTargetInfo() && "Missing aux target info");
return EmitTargetArchBuiltinExpr(
this, getContext().BuiltinInfo.getAuxBuiltinID(BuiltinID), E,
ReturnValue, getContext().getAuxTargetInfo()->getTriple().getArch());
}
return EmitTargetArchBuiltinExpr(this, BuiltinID, E, ReturnValue,
getTarget().getTriple().getArch());
}
static void initializeAlloca(CodeGenFunction &CGF, AllocaInst *AI, Value *Size,
Align AlignmentInBytes) {
ConstantInt *Byte;
switch (CGF.getLangOpts().getTrivialAutoVarInit()) {
case LangOptions::TrivialAutoVarInitKind::Uninitialized:
// Nothing to initialize.
return;
case LangOptions::TrivialAutoVarInitKind::Zero:
Byte = CGF.Builder.getInt8(0x00);
break;
case LangOptions::TrivialAutoVarInitKind::Pattern: {
llvm::Type *Int8 = llvm::IntegerType::getInt8Ty(CGF.CGM.getLLVMContext());
Byte = llvm::dyn_cast<llvm::ConstantInt>(
initializationPatternFor(CGF.CGM, Int8));
break;
}
}
if (CGF.CGM.stopAutoInit())
return;
auto *I = CGF.Builder.CreateMemSet(AI, Byte, Size, AlignmentInBytes);
I->addAnnotationMetadata("auto-init");
}
/// getBuiltinLibFunction - Given a builtin id for a function like
/// "__builtin_fabsf", return a Function* for "fabsf".
llvm::Constant *CodeGenModule::getBuiltinLibFunction(const FunctionDecl *FD,
unsigned BuiltinID) {
assert(Context.BuiltinInfo.isLibFunction(BuiltinID));
// Get the name, skip over the __builtin_ prefix (if necessary). We may have
// to build this up so provide a small stack buffer to handle the vast
// majority of names.
llvm::SmallString<64> Name;
GlobalDecl D(FD);
// TODO: This list should be expanded or refactored after all GCC-compatible
// std libcall builtins are implemented.
static SmallDenseMap<unsigned, StringRef, 64> F128Builtins{
{Builtin::BI__builtin___fprintf_chk, "__fprintf_chkieee128"},
{Builtin::BI__builtin___printf_chk, "__printf_chkieee128"},
{Builtin::BI__builtin___snprintf_chk, "__snprintf_chkieee128"},
{Builtin::BI__builtin___sprintf_chk, "__sprintf_chkieee128"},
{Builtin::BI__builtin___vfprintf_chk, "__vfprintf_chkieee128"},
{Builtin::BI__builtin___vprintf_chk, "__vprintf_chkieee128"},
{Builtin::BI__builtin___vsnprintf_chk, "__vsnprintf_chkieee128"},
{Builtin::BI__builtin___vsprintf_chk, "__vsprintf_chkieee128"},
{Builtin::BI__builtin_fprintf, "__fprintfieee128"},
{Builtin::BI__builtin_printf, "__printfieee128"},
{Builtin::BI__builtin_snprintf, "__snprintfieee128"},
{Builtin::BI__builtin_sprintf, "__sprintfieee128"},
{Builtin::BI__builtin_vfprintf, "__vfprintfieee128"},
{Builtin::BI__builtin_vprintf, "__vprintfieee128"},
{Builtin::BI__builtin_vsnprintf, "__vsnprintfieee128"},
{Builtin::BI__builtin_vsprintf, "__vsprintfieee128"},
{Builtin::BI__builtin_fscanf, "__fscanfieee128"},
{Builtin::BI__builtin_scanf, "__scanfieee128"},
{Builtin::BI__builtin_sscanf, "__sscanfieee128"},
{Builtin::BI__builtin_vfscanf, "__vfscanfieee128"},
{Builtin::BI__builtin_vscanf, "__vscanfieee128"},
{Builtin::BI__builtin_vsscanf, "__vsscanfieee128"},
{Builtin::BI__builtin_nexttowardf128, "__nexttowardieee128"},
};
// The AIX library functions frexpl, ldexpl, and modfl are for 128-bit
// IBM 'long double' (i.e. __ibm128). Map to the 'double' versions
// if it is 64-bit 'long double' mode.
static SmallDenseMap<unsigned, StringRef, 4> AIXLongDouble64Builtins{
{Builtin::BI__builtin_frexpl, "frexp"},
{Builtin::BI__builtin_ldexpl, "ldexp"},
{Builtin::BI__builtin_modfl, "modf"},
};
// If the builtin has been declared explicitly with an assembler label,
// use the mangled name. This differs from the plain label on platforms
// that prefix labels.
if (FD->hasAttr<AsmLabelAttr>())
Name = getMangledName(D);
else {
// TODO: This mutation should also be applied to other targets other than
// PPC, after backend supports IEEE 128-bit style libcalls.
if (getTriple().isPPC64() &&
&getTarget().getLongDoubleFormat() == &llvm::APFloat::IEEEquad() &&
F128Builtins.contains(BuiltinID))
Name = F128Builtins[BuiltinID];
else if (getTriple().isOSAIX() &&
&getTarget().getLongDoubleFormat() ==
&llvm::APFloat::IEEEdouble() &&
AIXLongDouble64Builtins.contains(BuiltinID))
Name = AIXLongDouble64Builtins[BuiltinID];
else
Name = Context.BuiltinInfo.getName(BuiltinID).substr(10);
}
llvm::FunctionType *Ty =
cast<llvm::FunctionType>(getTypes().ConvertType(FD->getType()));
return GetOrCreateLLVMFunction(Name, Ty, D, /*ForVTable=*/false);
}
/// Emit the conversions required to turn the given value into an
/// integer of the given size.
Value *EmitToInt(CodeGenFunction &CGF, llvm::Value *V,
QualType T, llvm::IntegerType *IntType) {
V = CGF.EmitToMemory(V, T);
if (V->getType()->isPointerTy())
return CGF.Builder.CreatePtrToInt(V, IntType);
assert(V->getType() == IntType);
return V;
}
Value *EmitFromInt(CodeGenFunction &CGF, llvm::Value *V,
QualType T, llvm::Type *ResultType) {
V = CGF.EmitFromMemory(V, T);
if (ResultType->isPointerTy())
return CGF.Builder.CreateIntToPtr(V, ResultType);
assert(V->getType() == ResultType);
return V;
}
Address CheckAtomicAlignment(CodeGenFunction &CGF, const CallExpr *E) {
ASTContext &Ctx = CGF.getContext();
Address Ptr = CGF.EmitPointerWithAlignment(E->getArg(0));
unsigned Bytes = Ptr.getElementType()->isPointerTy()
? Ctx.getTypeSizeInChars(Ctx.VoidPtrTy).getQuantity()
: Ptr.getElementType()->getScalarSizeInBits() / 8;
unsigned Align = Ptr.getAlignment().getQuantity();
if (Align % Bytes != 0) {
DiagnosticsEngine &Diags = CGF.CGM.getDiags();
Diags.Report(E->getBeginLoc(), diag::warn_sync_op_misaligned);
// Force address to be at least naturally-aligned.
return Ptr.withAlignment(CharUnits::fromQuantity(Bytes));
}
return Ptr;
}
/// Utility to insert an atomic instruction based on Intrinsic::ID
/// and the expression node.
Value *MakeBinaryAtomicValue(
CodeGenFunction &CGF, llvm::AtomicRMWInst::BinOp Kind, const CallExpr *E,
AtomicOrdering Ordering) {
QualType T = E->getType();
assert(E->getArg(0)->getType()->isPointerType());
assert(CGF.getContext().hasSameUnqualifiedType(T,
E->getArg(0)->getType()->getPointeeType()));
assert(CGF.getContext().hasSameUnqualifiedType(T, E->getArg(1)->getType()));
Address DestAddr = CheckAtomicAlignment(CGF, E);
llvm::IntegerType *IntType = llvm::IntegerType::get(
CGF.getLLVMContext(), CGF.getContext().getTypeSize(T));
llvm::Value *Val = CGF.EmitScalarExpr(E->getArg(1));
llvm::Type *ValueType = Val->getType();
Val = EmitToInt(CGF, Val, T, IntType);
llvm::Value *Result =
CGF.Builder.CreateAtomicRMW(Kind, DestAddr, Val, Ordering);
return EmitFromInt(CGF, Result, T, ValueType);
}
static Value *EmitNontemporalStore(CodeGenFunction &CGF, const CallExpr *E) {
Value *Val = CGF.EmitScalarExpr(E->getArg(0));
Address Addr = CGF.EmitPointerWithAlignment(E->getArg(1));
Val = CGF.EmitToMemory(Val, E->getArg(0)->getType());
LValue LV = CGF.MakeAddrLValue(Addr, E->getArg(0)->getType());
LV.setNontemporal(true);
CGF.EmitStoreOfScalar(Val, LV, false);
return nullptr;
}
static Value *EmitNontemporalLoad(CodeGenFunction &CGF, const CallExpr *E) {
Address Addr = CGF.EmitPointerWithAlignment(E->getArg(0));
LValue LV = CGF.MakeAddrLValue(Addr, E->getType());
LV.setNontemporal(true);
return CGF.EmitLoadOfScalar(LV, E->getExprLoc());
}
static RValue EmitBinaryAtomic(CodeGenFunction &CGF,
llvm::AtomicRMWInst::BinOp Kind,
const CallExpr *E) {
return RValue::get(MakeBinaryAtomicValue(CGF, Kind, E));
}
/// Utility to insert an atomic instruction based Intrinsic::ID and
/// the expression node, where the return value is the result of the
/// operation.
static RValue EmitBinaryAtomicPost(CodeGenFunction &CGF,
llvm::AtomicRMWInst::BinOp Kind,
const CallExpr *E,
Instruction::BinaryOps Op,
bool Invert = false) {
QualType T = E->getType();
assert(E->getArg(0)->getType()->isPointerType());
assert(CGF.getContext().hasSameUnqualifiedType(T,
E->getArg(0)->getType()->getPointeeType()));
assert(CGF.getContext().hasSameUnqualifiedType(T, E->getArg(1)->getType()));
Address DestAddr = CheckAtomicAlignment(CGF, E);
llvm::IntegerType *IntType = llvm::IntegerType::get(
CGF.getLLVMContext(), CGF.getContext().getTypeSize(T));
llvm::Value *Val = CGF.EmitScalarExpr(E->getArg(1));
llvm::Type *ValueType = Val->getType();
Val = EmitToInt(CGF, Val, T, IntType);
llvm::Value *Result = CGF.Builder.CreateAtomicRMW(
Kind, DestAddr, Val, llvm::AtomicOrdering::SequentiallyConsistent);
Result = CGF.Builder.CreateBinOp(Op, Result, Val);
if (Invert)
Result =
CGF.Builder.CreateBinOp(llvm::Instruction::Xor, Result,
llvm::ConstantInt::getAllOnesValue(IntType));
Result = EmitFromInt(CGF, Result, T, ValueType);
return RValue::get(Result);
}
/// Utility to insert an atomic cmpxchg instruction.
///
/// @param CGF The current codegen function.
/// @param E Builtin call expression to convert to cmpxchg.
/// arg0 - address to operate on
/// arg1 - value to compare with
/// arg2 - new value
/// @param ReturnBool Specifies whether to return success flag of
/// cmpxchg result or the old value.
///
/// @returns result of cmpxchg, according to ReturnBool
///
/// Note: In order to lower Microsoft's _InterlockedCompareExchange* intrinsics
/// invoke the function EmitAtomicCmpXchgForMSIntrin.
Value *MakeAtomicCmpXchgValue(CodeGenFunction &CGF, const CallExpr *E,
bool ReturnBool) {
QualType T = ReturnBool ? E->getArg(1)->getType() : E->getType();
Address DestAddr = CheckAtomicAlignment(CGF, E);
llvm::IntegerType *IntType = llvm::IntegerType::get(
CGF.getLLVMContext(), CGF.getContext().getTypeSize(T));
Value *Cmp = CGF.EmitScalarExpr(E->getArg(1));
llvm::Type *ValueType = Cmp->getType();
Cmp = EmitToInt(CGF, Cmp, T, IntType);
Value *New = EmitToInt(CGF, CGF.EmitScalarExpr(E->getArg(2)), T, IntType);
Value *Pair = CGF.Builder.CreateAtomicCmpXchg(
DestAddr, Cmp, New, llvm::AtomicOrdering::SequentiallyConsistent,
llvm::AtomicOrdering::SequentiallyConsistent);
if (ReturnBool)
// Extract boolean success flag and zext it to int.
return CGF.Builder.CreateZExt(CGF.Builder.CreateExtractValue(Pair, 1),
CGF.ConvertType(E->getType()));
else
// Extract old value and emit it using the same type as compare value.
return EmitFromInt(CGF, CGF.Builder.CreateExtractValue(Pair, 0), T,
ValueType);
}
/// This function should be invoked to emit atomic cmpxchg for Microsoft's
/// _InterlockedCompareExchange* intrinsics which have the following signature:
/// T _InterlockedCompareExchange(T volatile *Destination,
/// T Exchange,
/// T Comparand);
///
/// Whereas the llvm 'cmpxchg' instruction has the following syntax:
/// cmpxchg *Destination, Comparand, Exchange.
/// So we need to swap Comparand and Exchange when invoking
/// CreateAtomicCmpXchg. That is the reason we could not use the above utility
/// function MakeAtomicCmpXchgValue since it expects the arguments to be
/// already swapped.
static
Value *EmitAtomicCmpXchgForMSIntrin(CodeGenFunction &CGF, const CallExpr *E,
AtomicOrdering SuccessOrdering = AtomicOrdering::SequentiallyConsistent) {
assert(E->getArg(0)->getType()->isPointerType());
assert(CGF.getContext().hasSameUnqualifiedType(
E->getType(), E->getArg(0)->getType()->getPointeeType()));
assert(CGF.getContext().hasSameUnqualifiedType(E->getType(),
E->getArg(1)->getType()));
assert(CGF.getContext().hasSameUnqualifiedType(E->getType(),
E->getArg(2)->getType()));
Address DestAddr = CheckAtomicAlignment(CGF, E);
auto *Exchange = CGF.EmitScalarExpr(E->getArg(1));
auto *RTy = Exchange->getType();
auto *Comparand = CGF.EmitScalarExpr(E->getArg(2));
if (RTy->isPointerTy()) {
Exchange = CGF.Builder.CreatePtrToInt(Exchange, CGF.IntPtrTy);
Comparand = CGF.Builder.CreatePtrToInt(Comparand, CGF.IntPtrTy);
}
// For Release ordering, the failure ordering should be Monotonic.
auto FailureOrdering = SuccessOrdering == AtomicOrdering::Release ?
AtomicOrdering::Monotonic :
SuccessOrdering;
// The atomic instruction is marked volatile for consistency with MSVC. This
// blocks the few atomics optimizations that LLVM has. If we want to optimize
// _Interlocked* operations in the future, we will have to remove the volatile
// marker.
auto *CmpXchg = CGF.Builder.CreateAtomicCmpXchg(
DestAddr, Comparand, Exchange, SuccessOrdering, FailureOrdering);
CmpXchg->setVolatile(true);
auto *Result = CGF.Builder.CreateExtractValue(CmpXchg, 0);
if (RTy->isPointerTy()) {
Result = CGF.Builder.CreateIntToPtr(Result, RTy);
}
return Result;
}
// 64-bit Microsoft platforms support 128 bit cmpxchg operations. They are
// prototyped like this:
//
// unsigned char _InterlockedCompareExchange128...(
// __int64 volatile * _Destination,
// __int64 _ExchangeHigh,
// __int64 _ExchangeLow,
// __int64 * _ComparandResult);
//
// Note that Destination is assumed to be at least 16-byte aligned, despite
// being typed int64.
static Value *EmitAtomicCmpXchg128ForMSIntrin(CodeGenFunction &CGF,
const CallExpr *E,
AtomicOrdering SuccessOrdering) {
assert(E->getNumArgs() == 4);
llvm::Value *DestPtr = CGF.EmitScalarExpr(E->getArg(0));
llvm::Value *ExchangeHigh = CGF.EmitScalarExpr(E->getArg(1));
llvm::Value *ExchangeLow = CGF.EmitScalarExpr(E->getArg(2));
Address ComparandAddr = CGF.EmitPointerWithAlignment(E->getArg(3));
assert(DestPtr->getType()->isPointerTy());
assert(!ExchangeHigh->getType()->isPointerTy());
assert(!ExchangeLow->getType()->isPointerTy());
// For Release ordering, the failure ordering should be Monotonic.
auto FailureOrdering = SuccessOrdering == AtomicOrdering::Release
? AtomicOrdering::Monotonic
: SuccessOrdering;
// Convert to i128 pointers and values. Alignment is also overridden for
// destination pointer.
llvm::Type *Int128Ty = llvm::IntegerType::get(CGF.getLLVMContext(), 128);
Address DestAddr(DestPtr, Int128Ty,
CGF.getContext().toCharUnitsFromBits(128));
ComparandAddr = ComparandAddr.withElementType(Int128Ty);
// (((i128)hi) << 64) | ((i128)lo)
ExchangeHigh = CGF.Builder.CreateZExt(ExchangeHigh, Int128Ty);
ExchangeLow = CGF.Builder.CreateZExt(ExchangeLow, Int128Ty);
ExchangeHigh =
CGF.Builder.CreateShl(ExchangeHigh, llvm::ConstantInt::get(Int128Ty, 64));
llvm::Value *Exchange = CGF.Builder.CreateOr(ExchangeHigh, ExchangeLow);
// Load the comparand for the instruction.
llvm::Value *Comparand = CGF.Builder.CreateLoad(ComparandAddr);
auto *CXI = CGF.Builder.CreateAtomicCmpXchg(DestAddr, Comparand, Exchange,
SuccessOrdering, FailureOrdering);
// The atomic instruction is marked volatile for consistency with MSVC. This
// blocks the few atomics optimizations that LLVM has. If we want to optimize
// _Interlocked* operations in the future, we will have to remove the volatile
// marker.
CXI->setVolatile(true);
// Store the result as an outparameter.
CGF.Builder.CreateStore(CGF.Builder.CreateExtractValue(CXI, 0),
ComparandAddr);
// Get the success boolean and zero extend it to i8.
Value *Success = CGF.Builder.CreateExtractValue(CXI, 1);
return CGF.Builder.CreateZExt(Success, CGF.Int8Ty);
}
static Value *EmitAtomicIncrementValue(CodeGenFunction &CGF, const CallExpr *E,
AtomicOrdering Ordering = AtomicOrdering::SequentiallyConsistent) {
assert(E->getArg(0)->getType()->isPointerType());
auto *IntTy = CGF.ConvertType(E->getType());
Address DestAddr = CheckAtomicAlignment(CGF, E);
auto *Result = CGF.Builder.CreateAtomicRMW(
AtomicRMWInst::Add, DestAddr, ConstantInt::get(IntTy, 1), Ordering);
return CGF.Builder.CreateAdd(Result, ConstantInt::get(IntTy, 1));
}
static Value *EmitAtomicDecrementValue(
CodeGenFunction &CGF, const CallExpr *E,
AtomicOrdering Ordering = AtomicOrdering::SequentiallyConsistent) {
assert(E->getArg(0)->getType()->isPointerType());
auto *IntTy = CGF.ConvertType(E->getType());
Address DestAddr = CheckAtomicAlignment(CGF, E);
auto *Result = CGF.Builder.CreateAtomicRMW(
AtomicRMWInst::Sub, DestAddr, ConstantInt::get(IntTy, 1), Ordering);
return CGF.Builder.CreateSub(Result, ConstantInt::get(IntTy, 1));
}
// Build a plain volatile load.
static Value *EmitISOVolatileLoad(CodeGenFunction &CGF, const CallExpr *E) {
Value *Ptr = CGF.EmitScalarExpr(E->getArg(0));
QualType ElTy = E->getArg(0)->getType()->getPointeeType();
CharUnits LoadSize = CGF.getContext().getTypeSizeInChars(ElTy);
llvm::Type *ITy =
llvm::IntegerType::get(CGF.getLLVMContext(), LoadSize.getQuantity() * 8);
llvm::LoadInst *Load = CGF.Builder.CreateAlignedLoad(ITy, Ptr, LoadSize);
Load->setVolatile(true);
return Load;
}
// Build a plain volatile store.
static Value *EmitISOVolatileStore(CodeGenFunction &CGF, const CallExpr *E) {
Value *Ptr = CGF.EmitScalarExpr(E->getArg(0));
Value *Value = CGF.EmitScalarExpr(E->getArg(1));
QualType ElTy = E->getArg(0)->getType()->getPointeeType();
CharUnits StoreSize = CGF.getContext().getTypeSizeInChars(ElTy);
llvm::StoreInst *Store =
CGF.Builder.CreateAlignedStore(Value, Ptr, StoreSize);
Store->setVolatile(true);
return Store;
}
// Emit a simple mangled intrinsic that has 1 argument and a return type
// matching the argument type. Depending on mode, this may be a constrained
// floating-point intrinsic.
Value *emitUnaryMaybeConstrainedFPBuiltin(CodeGenFunction &CGF,
const CallExpr *E, unsigned IntrinsicID,
unsigned ConstrainedIntrinsicID) {
llvm::Value *Src0 = CGF.EmitScalarExpr(E->getArg(0));
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, E);
if (CGF.Builder.getIsFPConstrained()) {
Function *F = CGF.CGM.getIntrinsic(ConstrainedIntrinsicID, Src0->getType());
return CGF.Builder.CreateConstrainedFPCall(F, { Src0 });
} else {
Function *F = CGF.CGM.getIntrinsic(IntrinsicID, Src0->getType());
return CGF.Builder.CreateCall(F, Src0);
}
}
// Emit an intrinsic that has 2 operands of the same type as its result.
// Depending on mode, this may be a constrained floating-point intrinsic.
static Value *emitBinaryMaybeConstrainedFPBuiltin(CodeGenFunction &CGF,
const CallExpr *E, unsigned IntrinsicID,
unsigned ConstrainedIntrinsicID) {
llvm::Value *Src0 = CGF.EmitScalarExpr(E->getArg(0));
llvm::Value *Src1 = CGF.EmitScalarExpr(E->getArg(1));
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, E);
if (CGF.Builder.getIsFPConstrained()) {
Function *F = CGF.CGM.getIntrinsic(ConstrainedIntrinsicID, Src0->getType());
return CGF.Builder.CreateConstrainedFPCall(F, { Src0, Src1 });
} else {
Function *F = CGF.CGM.getIntrinsic(IntrinsicID, Src0->getType());
return CGF.Builder.CreateCall(F, { Src0, Src1 });
}
}
// Has second type mangled argument.
static Value *
emitBinaryExpMaybeConstrainedFPBuiltin(CodeGenFunction &CGF, const CallExpr *E,
Intrinsic::ID IntrinsicID,
Intrinsic::ID ConstrainedIntrinsicID) {
llvm::Value *Src0 = CGF.EmitScalarExpr(E->getArg(0));
llvm::Value *Src1 = CGF.EmitScalarExpr(E->getArg(1));
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, E);
if (CGF.Builder.getIsFPConstrained()) {
Function *F = CGF.CGM.getIntrinsic(ConstrainedIntrinsicID,
{Src0->getType(), Src1->getType()});
return CGF.Builder.CreateConstrainedFPCall(F, {Src0, Src1});
}
Function *F =
CGF.CGM.getIntrinsic(IntrinsicID, {Src0->getType(), Src1->getType()});
return CGF.Builder.CreateCall(F, {Src0, Src1});
}
// Emit an intrinsic that has 3 operands of the same type as its result.
// Depending on mode, this may be a constrained floating-point intrinsic.
static Value *emitTernaryMaybeConstrainedFPBuiltin(CodeGenFunction &CGF,
const CallExpr *E, unsigned IntrinsicID,
unsigned ConstrainedIntrinsicID) {
llvm::Value *Src0 = CGF.EmitScalarExpr(E->getArg(0));
llvm::Value *Src1 = CGF.EmitScalarExpr(E->getArg(1));
llvm::Value *Src2 = CGF.EmitScalarExpr(E->getArg(2));
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, E);
if (CGF.Builder.getIsFPConstrained()) {
Function *F = CGF.CGM.getIntrinsic(ConstrainedIntrinsicID, Src0->getType());
return CGF.Builder.CreateConstrainedFPCall(F, { Src0, Src1, Src2 });
} else {
Function *F = CGF.CGM.getIntrinsic(IntrinsicID, Src0->getType());
return CGF.Builder.CreateCall(F, { Src0, Src1, Src2 });
}
}
// Emit an intrinsic that has overloaded integer result and fp operand.
static Value *
emitMaybeConstrainedFPToIntRoundBuiltin(CodeGenFunction &CGF, const CallExpr *E,
unsigned IntrinsicID,
unsigned ConstrainedIntrinsicID) {
llvm::Type *ResultType = CGF.ConvertType(E->getType());
llvm::Value *Src0 = CGF.EmitScalarExpr(E->getArg(0));
if (CGF.Builder.getIsFPConstrained()) {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, E);
Function *F = CGF.CGM.getIntrinsic(ConstrainedIntrinsicID,
{ResultType, Src0->getType()});
return CGF.Builder.CreateConstrainedFPCall(F, {Src0});
} else {
Function *F =
CGF.CGM.getIntrinsic(IntrinsicID, {ResultType, Src0->getType()});
return CGF.Builder.CreateCall(F, Src0);
}
}
static Value *emitFrexpBuiltin(CodeGenFunction &CGF, const CallExpr *E,
Intrinsic::ID IntrinsicID) {
llvm::Value *Src0 = CGF.EmitScalarExpr(E->getArg(0));
llvm::Value *Src1 = CGF.EmitScalarExpr(E->getArg(1));
QualType IntPtrTy = E->getArg(1)->getType()->getPointeeType();
llvm::Type *IntTy = CGF.ConvertType(IntPtrTy);
llvm::Function *F =
CGF.CGM.getIntrinsic(IntrinsicID, {Src0->getType(), IntTy});
llvm::Value *Call = CGF.Builder.CreateCall(F, Src0);
llvm::Value *Exp = CGF.Builder.CreateExtractValue(Call, 1);
LValue LV = CGF.MakeNaturalAlignAddrLValue(Src1, IntPtrTy);
CGF.EmitStoreOfScalar(Exp, LV);
return CGF.Builder.CreateExtractValue(Call, 0);
}
static void emitSincosBuiltin(CodeGenFunction &CGF, const CallExpr *E,
Intrinsic::ID IntrinsicID) {
llvm::Value *Val = CGF.EmitScalarExpr(E->getArg(0));
llvm::Value *Dest0 = CGF.EmitScalarExpr(E->getArg(1));
llvm::Value *Dest1 = CGF.EmitScalarExpr(E->getArg(2));
llvm::Function *F = CGF.CGM.getIntrinsic(IntrinsicID, {Val->getType()});
llvm::Value *Call = CGF.Builder.CreateCall(F, Val);
llvm::Value *SinResult = CGF.Builder.CreateExtractValue(Call, 0);
llvm::Value *CosResult = CGF.Builder.CreateExtractValue(Call, 1);
QualType DestPtrType = E->getArg(1)->getType()->getPointeeType();
LValue SinLV = CGF.MakeNaturalAlignAddrLValue(Dest0, DestPtrType);
LValue CosLV = CGF.MakeNaturalAlignAddrLValue(Dest1, DestPtrType);
llvm::StoreInst *StoreSin =
CGF.Builder.CreateStore(SinResult, SinLV.getAddress());
llvm::StoreInst *StoreCos =
CGF.Builder.CreateStore(CosResult, CosLV.getAddress());
// Mark the two stores as non-aliasing with each other. The order of stores
// emitted by this builtin is arbitrary, enforcing a particular order will
// prevent optimizations later on.
llvm::MDBuilder MDHelper(CGF.getLLVMContext());
MDNode *Domain = MDHelper.createAnonymousAliasScopeDomain();
MDNode *AliasScope = MDHelper.createAnonymousAliasScope(Domain);
MDNode *AliasScopeList = MDNode::get(Call->getContext(), AliasScope);
StoreSin->setMetadata(LLVMContext::MD_alias_scope, AliasScopeList);
StoreCos->setMetadata(LLVMContext::MD_noalias, AliasScopeList);
}
static llvm::Value *emitModfBuiltin(CodeGenFunction &CGF, const CallExpr *E,
Intrinsic::ID IntrinsicID) {
llvm::Value *Val = CGF.EmitScalarExpr(E->getArg(0));
llvm::Value *IntPartDest = CGF.EmitScalarExpr(E->getArg(1));
llvm::Value *Call =
CGF.Builder.CreateIntrinsic(IntrinsicID, {Val->getType()}, Val);
llvm::Value *FractionalResult = CGF.Builder.CreateExtractValue(Call, 0);
llvm::Value *IntegralResult = CGF.Builder.CreateExtractValue(Call, 1);
QualType DestPtrType = E->getArg(1)->getType()->getPointeeType();
LValue IntegralLV = CGF.MakeNaturalAlignAddrLValue(IntPartDest, DestPtrType);
CGF.EmitStoreOfScalar(IntegralResult, IntegralLV);
return FractionalResult;
}
/// EmitFAbs - Emit a call to @llvm.fabs().
static Value *EmitFAbs(CodeGenFunction &CGF, Value *V) {
Function *F = CGF.CGM.getIntrinsic(Intrinsic::fabs, V->getType());
llvm::CallInst *Call = CGF.Builder.CreateCall(F, V);
Call->setDoesNotAccessMemory();
return Call;
}
/// Emit the computation of the sign bit for a floating point value. Returns
/// the i1 sign bit value.
static Value *EmitSignBit(CodeGenFunction &CGF, Value *V) {
LLVMContext &C = CGF.CGM.getLLVMContext();
llvm::Type *Ty = V->getType();
int Width = Ty->getPrimitiveSizeInBits();
llvm::Type *IntTy = llvm::IntegerType::get(C, Width);
V = CGF.Builder.CreateBitCast(V, IntTy);
if (Ty->isPPC_FP128Ty()) {
// We want the sign bit of the higher-order double. The bitcast we just
// did works as if the double-double was stored to memory and then
// read as an i128. The "store" will put the higher-order double in the
// lower address in both little- and big-Endian modes, but the "load"
// will treat those bits as a different part of the i128: the low bits in
// little-Endian, the high bits in big-Endian. Therefore, on big-Endian
// we need to shift the high bits down to the low before truncating.
Width >>= 1;
if (CGF.getTarget().isBigEndian()) {
Value *ShiftCst = llvm::ConstantInt::get(IntTy, Width);
V = CGF.Builder.CreateLShr(V, ShiftCst);
}
// We are truncating value in order to extract the higher-order
// double, which we will be using to extract the sign from.
IntTy = llvm::IntegerType::get(C, Width);
V = CGF.Builder.CreateTrunc(V, IntTy);
}
Value *Zero = llvm::Constant::getNullValue(IntTy);
return CGF.Builder.CreateICmpSLT(V, Zero);
}
/// Checks no arguments or results are passed indirectly in the ABI (i.e. via a
/// hidden pointer). This is used to check annotating FP libcalls (that could
/// set `errno`) with "int" TBAA metadata is safe. If any floating-point
/// arguments are passed indirectly, setup for the call could be incorrectly
/// optimized out.
static bool HasNoIndirectArgumentsOrResults(CGFunctionInfo const &FnInfo) {
auto IsIndirect = [&](ABIArgInfo const &info) {
return info.isIndirect() || info.isIndirectAliased() || info.isInAlloca();
};
return !IsIndirect(FnInfo.getReturnInfo()) &&
llvm::none_of(FnInfo.arguments(),
[&](CGFunctionInfoArgInfo const &ArgInfo) {
return IsIndirect(ArgInfo.info);
});
}
static RValue emitLibraryCall(CodeGenFunction &CGF, const FunctionDecl *FD,
const CallExpr *E, llvm::Constant *calleeValue) {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, E);
CGCallee callee = CGCallee::forDirect(calleeValue, GlobalDecl(FD));
llvm::CallBase *callOrInvoke = nullptr;
CGFunctionInfo const *FnInfo = nullptr;
RValue Call =
CGF.EmitCall(E->getCallee()->getType(), callee, E, ReturnValueSlot(),
/*Chain=*/nullptr, &callOrInvoke, &FnInfo);
if (unsigned BuiltinID = FD->getBuiltinID()) {
// Check whether a FP math builtin function, such as BI__builtin_expf
ASTContext &Context = CGF.getContext();
bool ConstWithoutErrnoAndExceptions =
Context.BuiltinInfo.isConstWithoutErrnoAndExceptions(BuiltinID);
// Restrict to target with errno, for example, MacOS doesn't set errno.
// TODO: Support builtin function with complex type returned, eg: cacosh
if (ConstWithoutErrnoAndExceptions && CGF.CGM.getLangOpts().MathErrno &&
!CGF.Builder.getIsFPConstrained() && Call.isScalar() &&
HasNoIndirectArgumentsOrResults(*FnInfo)) {
// Emit "int" TBAA metadata on FP math libcalls.
clang::QualType IntTy = Context.IntTy;
TBAAAccessInfo TBAAInfo = CGF.CGM.getTBAAAccessInfo(IntTy);
CGF.CGM.DecorateInstructionWithTBAA(callOrInvoke, TBAAInfo);
}
}
return Call;
}
/// Emit a call to llvm.{sadd,uadd,ssub,usub,smul,umul}.with.overflow.*
/// depending on IntrinsicID.
///
/// \arg CGF The current codegen function.
/// \arg IntrinsicID The ID for the Intrinsic we wish to generate.
/// \arg X The first argument to the llvm.*.with.overflow.*.
/// \arg Y The second argument to the llvm.*.with.overflow.*.
/// \arg Carry The carry returned by the llvm.*.with.overflow.*.
/// \returns The result (i.e. sum/product) returned by the intrinsic.
llvm::Value *EmitOverflowIntrinsic(CodeGenFunction &CGF,
const Intrinsic::ID IntrinsicID,
llvm::Value *X, llvm::Value *Y,
llvm::Value *&Carry) {
// Make sure we have integers of the same width.
assert(X->getType() == Y->getType() &&
"Arguments must be the same type. (Did you forget to make sure both "
"arguments have the same integer width?)");
Function *Callee = CGF.CGM.getIntrinsic(IntrinsicID, X->getType());
llvm::Value *Tmp = CGF.Builder.CreateCall(Callee, {X, Y});
Carry = CGF.Builder.CreateExtractValue(Tmp, 1);
return CGF.Builder.CreateExtractValue(Tmp, 0);
}
namespace {
struct WidthAndSignedness {
unsigned Width;
bool Signed;
};
}
static WidthAndSignedness
getIntegerWidthAndSignedness(const clang::ASTContext &context,
const clang::QualType Type) {
assert(Type->isIntegerType() && "Given type is not an integer.");
unsigned Width = context.getIntWidth(Type);
bool Signed = Type->isSignedIntegerType();
return {Width, Signed};
}
// Given one or more integer types, this function produces an integer type that
// encompasses them: any value in one of the given types could be expressed in
// the encompassing type.
static struct WidthAndSignedness
EncompassingIntegerType(ArrayRef<struct WidthAndSignedness> Types) {
assert(Types.size() > 0 && "Empty list of types.");
// If any of the given types is signed, we must return a signed type.
bool Signed = false;
for (const auto &Type : Types) {
Signed |= Type.Signed;
}
// The encompassing type must have a width greater than or equal to the width
// of the specified types. Additionally, if the encompassing type is signed,
// its width must be strictly greater than the width of any unsigned types
// given.
unsigned Width = 0;
for (const auto &Type : Types) {
unsigned MinWidth = Type.Width + (Signed && !Type.Signed);
if (Width < MinWidth) {
Width = MinWidth;
}
}
return {Width, Signed};
}
Value *CodeGenFunction::EmitVAStartEnd(Value *ArgValue, bool IsStart) {
Intrinsic::ID inst = IsStart ? Intrinsic::vastart : Intrinsic::vaend;
return Builder.CreateCall(CGM.getIntrinsic(inst, {ArgValue->getType()}),
ArgValue);
}
/// Checks if using the result of __builtin_object_size(p, @p From) in place of
/// __builtin_object_size(p, @p To) is correct
static bool areBOSTypesCompatible(int From, int To) {
// Note: Our __builtin_object_size implementation currently treats Type=0 and
// Type=2 identically. Encoding this implementation detail here may make
// improving __builtin_object_size difficult in the future, so it's omitted.
return From == To || (From == 0 && To == 1) || (From == 3 && To == 2);
}
static llvm::Value *
getDefaultBuiltinObjectSizeResult(unsigned Type, llvm::IntegerType *ResType) {
return ConstantInt::get(ResType, (Type & 2) ? 0 : -1, /*isSigned=*/true);
}
llvm::Value *
CodeGenFunction::evaluateOrEmitBuiltinObjectSize(const Expr *E, unsigned Type,
llvm::IntegerType *ResType,
llvm::Value *EmittedE,
bool IsDynamic) {
uint64_t ObjectSize;
if (!E->tryEvaluateObjectSize(ObjectSize, getContext(), Type))
return emitBuiltinObjectSize(E, Type, ResType, EmittedE, IsDynamic);
return ConstantInt::get(ResType, ObjectSize, /*isSigned=*/true);
}
namespace {
/// StructFieldAccess is a simple visitor class to grab the first MemberExpr
/// from an Expr. It records any ArraySubscriptExpr we meet along the way.
class StructFieldAccess
: public ConstStmtVisitor<StructFieldAccess, const Expr *> {
bool AddrOfSeen = false;
public:
const ArraySubscriptExpr *ASE = nullptr;
const Expr *VisitMemberExpr(const MemberExpr *E) {
if (AddrOfSeen && E->getType()->isArrayType())
// Avoid forms like '&ptr->array'.
return nullptr;
return E;
}
const Expr *VisitArraySubscriptExpr(const ArraySubscriptExpr *E) {
if (ASE)
// We don't support multiple subscripts.
return nullptr;
AddrOfSeen = false; // '&ptr->array[idx]' is okay.
ASE = E;
return Visit(E->getBase());
}
const Expr *VisitCastExpr(const CastExpr *E) {
if (E->getCastKind() == CK_LValueToRValue)
return E;
return Visit(E->getSubExpr());
}
const Expr *VisitParenExpr(const ParenExpr *E) {
return Visit(E->getSubExpr());
}
const Expr *VisitUnaryAddrOf(const clang::UnaryOperator *E) {
AddrOfSeen = true;
return Visit(E->getSubExpr());
}
const Expr *VisitUnaryDeref(const clang::UnaryOperator *E) {
AddrOfSeen = false;
return Visit(E->getSubExpr());
}
};
} // end anonymous namespace
/// Find a struct's flexible array member. It may be embedded inside multiple
/// sub-structs, but must still be the last field.
static const FieldDecl *FindFlexibleArrayMemberField(CodeGenFunction &CGF,
ASTContext &Ctx,
const RecordDecl *RD) {
const LangOptions::StrictFlexArraysLevelKind StrictFlexArraysLevel =
CGF.getLangOpts().getStrictFlexArraysLevel();
if (RD->isImplicit())
return nullptr;
for (const FieldDecl *FD : RD->fields()) {
if (Decl::isFlexibleArrayMemberLike(
Ctx, FD, FD->getType(), StrictFlexArraysLevel,
/*IgnoreTemplateOrMacroSubstitution=*/true))
return FD;
if (auto RT = FD->getType()->getAs<RecordType>())
if (const FieldDecl *FD =
FindFlexibleArrayMemberField(CGF, Ctx, RT->getAsRecordDecl()))
return FD;
}
return nullptr;
}
/// Calculate the offset of a struct field. It may be embedded inside multiple
/// sub-structs.
static bool GetFieldOffset(ASTContext &Ctx, const RecordDecl *RD,
const FieldDecl *FD, int64_t &Offset) {
if (RD->isImplicit())
return false;
// Keep track of the field number ourselves, because the other methods
// (CGRecordLayout::getLLVMFieldNo) aren't always equivalent to how the AST
// is laid out.
uint32_t FieldNo = 0;
const ASTRecordLayout &Layout = Ctx.getASTRecordLayout(RD);
for (const FieldDecl *Field : RD->fields()) {
if (Field == FD) {
Offset += Layout.getFieldOffset(FieldNo);
return true;
}
if (auto RT = Field->getType()->getAs<RecordType>()) {
if (GetFieldOffset(Ctx, RT->getAsRecordDecl(), FD, Offset)) {
Offset += Layout.getFieldOffset(FieldNo);
return true;
}