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|
//===------- Interp.cpp - Interpreter for the constexpr VM ------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "Interp.h"
#include "Function.h"
#include "InterpFrame.h"
#include "InterpShared.h"
#include "InterpStack.h"
#include "Opcode.h"
#include "PrimType.h"
#include "Program.h"
#include "State.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTDiagnostic.h"
#include "clang/AST/CXXInheritance.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.h"
#include "llvm/ADT/APSInt.h"
#include <limits>
#include <vector>
using namespace clang;
using namespace clang;
using namespace clang::interp;
static bool RetValue(InterpState &S, CodePtr &Pt, APValue &Result) {
llvm::report_fatal_error("Interpreter cannot return values");
}
//===----------------------------------------------------------------------===//
// Jmp, Jt, Jf
//===----------------------------------------------------------------------===//
static bool Jmp(InterpState &S, CodePtr &PC, int32_t Offset) {
PC += Offset;
return true;
}
static bool Jt(InterpState &S, CodePtr &PC, int32_t Offset) {
if (S.Stk.pop<bool>()) {
PC += Offset;
}
return true;
}
static bool Jf(InterpState &S, CodePtr &PC, int32_t Offset) {
if (!S.Stk.pop<bool>()) {
PC += Offset;
}
return true;
}
static void diagnoseNonConstVariable(InterpState &S, CodePtr OpPC,
const ValueDecl *VD) {
if (!S.getLangOpts().CPlusPlus)
return;
const SourceInfo &Loc = S.Current->getSource(OpPC);
if (VD->getType()->isIntegralOrEnumerationType())
S.FFDiag(Loc, diag::note_constexpr_ltor_non_const_int, 1) << VD;
else
S.FFDiag(Loc,
S.getLangOpts().CPlusPlus11
? diag::note_constexpr_ltor_non_constexpr
: diag::note_constexpr_ltor_non_integral,
1)
<< VD << VD->getType();
S.Note(VD->getLocation(), diag::note_declared_at);
}
static bool CheckActive(InterpState &S, CodePtr OpPC, const Pointer &Ptr,
AccessKinds AK) {
if (Ptr.isActive())
return true;
// Get the inactive field descriptor.
const FieldDecl *InactiveField = Ptr.getField();
// Walk up the pointer chain to find the union which is not active.
Pointer U = Ptr.getBase();
while (!U.isActive()) {
U = U.getBase();
}
// Find the active field of the union.
const Record *R = U.getRecord();
assert(R && R->isUnion() && "Not a union");
const FieldDecl *ActiveField = nullptr;
for (unsigned I = 0, N = R->getNumFields(); I < N; ++I) {
const Pointer &Field = U.atField(R->getField(I)->Offset);
if (Field.isActive()) {
ActiveField = Field.getField();
break;
}
}
const SourceInfo &Loc = S.Current->getSource(OpPC);
S.FFDiag(Loc, diag::note_constexpr_access_inactive_union_member)
<< AK << InactiveField << !ActiveField << ActiveField;
return false;
}
static bool CheckTemporary(InterpState &S, CodePtr OpPC, const Pointer &Ptr,
AccessKinds AK) {
if (auto ID = Ptr.getDeclID()) {
if (!Ptr.isStaticTemporary())
return true;
if (Ptr.getDeclDesc()->getType().isConstQualified())
return true;
if (S.P.getCurrentDecl() == ID)
return true;
const SourceInfo &E = S.Current->getSource(OpPC);
S.FFDiag(E, diag::note_constexpr_access_static_temporary, 1) << AK;
S.Note(Ptr.getDeclLoc(), diag::note_constexpr_temporary_here);
return false;
}
return true;
}
static bool CheckGlobal(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
if (auto ID = Ptr.getDeclID()) {
if (!Ptr.isStatic())
return true;
if (S.P.getCurrentDecl() == ID)
return true;
S.FFDiag(S.Current->getLocation(OpPC), diag::note_constexpr_modify_global);
return false;
}
return true;
}
namespace clang {
namespace interp {
static void popArg(InterpState &S, const Expr *Arg) {
PrimType Ty = S.getContext().classify(Arg).value_or(PT_Ptr);
TYPE_SWITCH(Ty, S.Stk.discard<T>());
}
void cleanupAfterFunctionCall(InterpState &S, CodePtr OpPC) {
assert(S.Current);
const Function *CurFunc = S.Current->getFunction();
assert(CurFunc);
if (CurFunc->isUnevaluatedBuiltin())
return;
// Some builtin functions require us to only look at the call site, since
// the classified parameter types do not match.
if (CurFunc->isBuiltin()) {
const auto *CE =
cast<CallExpr>(S.Current->Caller->getExpr(S.Current->getRetPC()));
for (int32_t I = CE->getNumArgs() - 1; I >= 0; --I) {
const Expr *A = CE->getArg(I);
popArg(S, A);
}
return;
}
if (S.Current->Caller && CurFunc->isVariadic()) {
// CallExpr we're look for is at the return PC of the current function, i.e.
// in the caller.
// This code path should be executed very rarely.
unsigned NumVarArgs;
const Expr *const *Args = nullptr;
unsigned NumArgs = 0;
const Expr *CallSite = S.Current->Caller->getExpr(S.Current->getRetPC());
if (const auto *CE = dyn_cast<CallExpr>(CallSite)) {
Args = CE->getArgs();
NumArgs = CE->getNumArgs();
} else if (const auto *CE = dyn_cast<CXXConstructExpr>(CallSite)) {
Args = CE->getArgs();
NumArgs = CE->getNumArgs();
} else
assert(false && "Can't get arguments from that expression type");
assert(NumArgs >= CurFunc->getNumWrittenParams());
NumVarArgs = NumArgs - CurFunc->getNumWrittenParams();
for (unsigned I = 0; I != NumVarArgs; ++I) {
const Expr *A = Args[NumArgs - 1 - I];
popArg(S, A);
}
}
// And in any case, remove the fixed parameters (the non-variadic ones)
// at the end.
S.Current->popArgs();
}
bool CheckExtern(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
if (!Ptr.isExtern())
return true;
if (!S.checkingPotentialConstantExpression() && S.getLangOpts().CPlusPlus) {
const auto *VD = Ptr.getDeclDesc()->asValueDecl();
diagnoseNonConstVariable(S, OpPC, VD);
}
return false;
}
bool CheckArray(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
if (!Ptr.isUnknownSizeArray())
return true;
const SourceInfo &E = S.Current->getSource(OpPC);
S.FFDiag(E, diag::note_constexpr_unsized_array_indexed);
return false;
}
bool CheckLive(InterpState &S, CodePtr OpPC, const Pointer &Ptr,
AccessKinds AK) {
if (Ptr.isZero()) {
const auto &Src = S.Current->getSource(OpPC);
if (Ptr.isField())
S.FFDiag(Src, diag::note_constexpr_null_subobject) << CSK_Field;
else
S.FFDiag(Src, diag::note_constexpr_access_null) << AK;
return false;
}
if (!Ptr.isLive()) {
const auto &Src = S.Current->getSource(OpPC);
bool IsTemp = Ptr.isTemporary();
S.FFDiag(Src, diag::note_constexpr_lifetime_ended, 1) << AK << !IsTemp;
if (IsTemp)
S.Note(Ptr.getDeclLoc(), diag::note_constexpr_temporary_here);
else
S.Note(Ptr.getDeclLoc(), diag::note_declared_at);
return false;
}
return true;
}
bool CheckConstant(InterpState &S, CodePtr OpPC, const Descriptor *Desc) {
assert(Desc);
auto IsConstType = [&S](const VarDecl *VD) -> bool {
if (VD->isConstexpr())
return true;
if (S.getLangOpts().CPlusPlus && !S.getLangOpts().CPlusPlus11)
return false;
QualType T = VD->getType();
if (T.isConstQualified())
return true;
if (const auto *RT = T->getAs<ReferenceType>())
return RT->getPointeeType().isConstQualified();
if (const auto *PT = T->getAs<PointerType>())
return PT->getPointeeType().isConstQualified();
return false;
};
if (const auto *D = Desc->asValueDecl()) {
if (const auto *VD = dyn_cast<VarDecl>(D);
VD && VD->hasGlobalStorage() && !IsConstType(VD)) {
diagnoseNonConstVariable(S, OpPC, VD);
return S.inConstantContext();
}
}
return true;
}
static bool CheckConstant(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
return CheckConstant(S, OpPC, Ptr.getDeclDesc());
}
bool CheckNull(InterpState &S, CodePtr OpPC, const Pointer &Ptr,
CheckSubobjectKind CSK) {
if (!Ptr.isZero())
return true;
const SourceInfo &Loc = S.Current->getSource(OpPC);
S.FFDiag(Loc, diag::note_constexpr_null_subobject) << CSK;
return false;
}
bool CheckRange(InterpState &S, CodePtr OpPC, const Pointer &Ptr,
AccessKinds AK) {
if (!Ptr.isOnePastEnd())
return true;
const SourceInfo &Loc = S.Current->getSource(OpPC);
S.FFDiag(Loc, diag::note_constexpr_access_past_end) << AK;
return false;
}
bool CheckRange(InterpState &S, CodePtr OpPC, const Pointer &Ptr,
CheckSubobjectKind CSK) {
if (!Ptr.isElementPastEnd())
return true;
const SourceInfo &Loc = S.Current->getSource(OpPC);
S.FFDiag(Loc, diag::note_constexpr_past_end_subobject) << CSK;
return false;
}
bool CheckSubobject(InterpState &S, CodePtr OpPC, const Pointer &Ptr,
CheckSubobjectKind CSK) {
if (!Ptr.isOnePastEnd())
return true;
const SourceInfo &Loc = S.Current->getSource(OpPC);
S.FFDiag(Loc, diag::note_constexpr_past_end_subobject) << CSK;
return false;
}
bool CheckConst(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
assert(Ptr.isLive() && "Pointer is not live");
if (!Ptr.isConst())
return true;
// The This pointer is writable in constructors and destructors,
// even if isConst() returns true.
if (const Function *Func = S.Current->getFunction();
Func && (Func->isConstructor() || Func->isDestructor()) &&
Ptr.block() == S.Current->getThis().block()) {
return true;
}
const QualType Ty = Ptr.getType();
const SourceInfo &Loc = S.Current->getSource(OpPC);
S.FFDiag(Loc, diag::note_constexpr_modify_const_type) << Ty;
return false;
}
bool CheckMutable(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
assert(Ptr.isLive() && "Pointer is not live");
if (!Ptr.isMutable()) {
return true;
}
const SourceInfo &Loc = S.Current->getSource(OpPC);
const FieldDecl *Field = Ptr.getField();
S.FFDiag(Loc, diag::note_constexpr_access_mutable, 1) << AK_Read << Field;
S.Note(Field->getLocation(), diag::note_declared_at);
return false;
}
bool CheckInitialized(InterpState &S, CodePtr OpPC, const Pointer &Ptr,
AccessKinds AK) {
assert(Ptr.isLive());
if (Ptr.isInitialized())
return true;
if (const auto *VD = Ptr.getDeclDesc()->asVarDecl();
VD && VD->hasGlobalStorage()) {
const SourceInfo &Loc = S.Current->getSource(OpPC);
S.FFDiag(Loc, diag::note_constexpr_var_init_non_constant, 1) << VD;
S.Note(VD->getLocation(), diag::note_declared_at);
}
if (!S.checkingPotentialConstantExpression()) {
S.FFDiag(S.Current->getSource(OpPC), diag::note_constexpr_access_uninit)
<< AK << /*uninitialized=*/true << S.Current->getRange(OpPC);
}
return false;
}
bool CheckGlobalInitialized(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
if (Ptr.isInitialized())
return true;
assert(S.getLangOpts().CPlusPlus);
const auto *VD = cast<VarDecl>(Ptr.getDeclDesc()->asValueDecl());
if ((!VD->hasConstantInitialization() &&
VD->mightBeUsableInConstantExpressions(S.getCtx())) ||
(S.getLangOpts().OpenCL && !S.getLangOpts().CPlusPlus11 &&
!VD->hasICEInitializer(S.getCtx()))) {
const SourceInfo &Loc = S.Current->getSource(OpPC);
S.FFDiag(Loc, diag::note_constexpr_var_init_non_constant, 1) << VD;
S.Note(VD->getLocation(), diag::note_declared_at);
}
return false;
}
bool CheckLoad(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
if (!CheckLive(S, OpPC, Ptr, AK_Read))
return false;
if (!CheckConstant(S, OpPC, Ptr))
return false;
if (!CheckDummy(S, OpPC, Ptr))
return false;
if (!CheckExtern(S, OpPC, Ptr))
return false;
if (!CheckRange(S, OpPC, Ptr, AK_Read))
return false;
if (!CheckInitialized(S, OpPC, Ptr, AK_Read))
return false;
if (!CheckActive(S, OpPC, Ptr, AK_Read))
return false;
if (!CheckTemporary(S, OpPC, Ptr, AK_Read))
return false;
if (!CheckMutable(S, OpPC, Ptr))
return false;
return true;
}
bool CheckStore(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
if (!CheckLive(S, OpPC, Ptr, AK_Assign))
return false;
if (!CheckDummy(S, OpPC, Ptr))
return false;
if (!CheckExtern(S, OpPC, Ptr))
return false;
if (!CheckRange(S, OpPC, Ptr, AK_Assign))
return false;
if (!CheckGlobal(S, OpPC, Ptr))
return false;
if (!CheckConst(S, OpPC, Ptr))
return false;
return true;
}
bool CheckInvoke(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
if (!CheckLive(S, OpPC, Ptr, AK_MemberCall))
return false;
if (!CheckExtern(S, OpPC, Ptr))
return false;
if (!CheckRange(S, OpPC, Ptr, AK_MemberCall))
return false;
return true;
}
bool CheckInit(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
if (!CheckLive(S, OpPC, Ptr, AK_Assign))
return false;
if (!CheckRange(S, OpPC, Ptr, AK_Assign))
return false;
return true;
}
bool CheckCallable(InterpState &S, CodePtr OpPC, const Function *F) {
if (F->isVirtual() && !S.getLangOpts().CPlusPlus20) {
const SourceLocation &Loc = S.Current->getLocation(OpPC);
S.CCEDiag(Loc, diag::note_constexpr_virtual_call);
return false;
}
if (!F->isConstexpr()) {
const SourceLocation &Loc = S.Current->getLocation(OpPC);
if (S.getLangOpts().CPlusPlus11) {
const FunctionDecl *DiagDecl = F->getDecl();
// Invalid decls have been diagnosed before.
if (DiagDecl->isInvalidDecl())
return false;
// If this function is not constexpr because it is an inherited
// non-constexpr constructor, diagnose that directly.
const auto *CD = dyn_cast<CXXConstructorDecl>(DiagDecl);
if (CD && CD->isInheritingConstructor()) {
const auto *Inherited = CD->getInheritedConstructor().getConstructor();
if (!Inherited->isConstexpr())
DiagDecl = CD = Inherited;
}
// FIXME: If DiagDecl is an implicitly-declared special member function
// or an inheriting constructor, we should be much more explicit about why
// it's not constexpr.
if (CD && CD->isInheritingConstructor()) {
S.FFDiag(Loc, diag::note_constexpr_invalid_inhctor, 1)
<< CD->getInheritedConstructor().getConstructor()->getParent();
S.Note(DiagDecl->getLocation(), diag::note_declared_at);
} else {
// Don't emit anything if the function isn't defined and we're checking
// for a constant expression. It might be defined at the point we're
// actually calling it.
if (!DiagDecl->isDefined() && S.checkingPotentialConstantExpression())
return false;
// If the declaration is defined _and_ declared 'constexpr', the below
// diagnostic doesn't add anything useful.
if (DiagDecl->isDefined() && DiagDecl->isConstexpr())
return false;
S.FFDiag(Loc, diag::note_constexpr_invalid_function, 1)
<< DiagDecl->isConstexpr() << (bool)CD << DiagDecl;
S.Note(DiagDecl->getLocation(), diag::note_declared_at);
}
} else {
S.FFDiag(Loc, diag::note_invalid_subexpr_in_const_expr);
}
return false;
}
return true;
}
bool CheckCallDepth(InterpState &S, CodePtr OpPC) {
if ((S.Current->getDepth() + 1) > S.getLangOpts().ConstexprCallDepth) {
S.FFDiag(S.Current->getSource(OpPC),
diag::note_constexpr_depth_limit_exceeded)
<< S.getLangOpts().ConstexprCallDepth;
return false;
}
return true;
}
bool CheckThis(InterpState &S, CodePtr OpPC, const Pointer &This) {
if (!This.isZero())
return true;
const SourceInfo &Loc = S.Current->getSource(OpPC);
bool IsImplicit = false;
if (const auto *E = dyn_cast_if_present<CXXThisExpr>(Loc.asExpr()))
IsImplicit = E->isImplicit();
if (S.getLangOpts().CPlusPlus11)
S.FFDiag(Loc, diag::note_constexpr_this) << IsImplicit;
else
S.FFDiag(Loc);
return false;
}
bool CheckPure(InterpState &S, CodePtr OpPC, const CXXMethodDecl *MD) {
if (!MD->isPureVirtual())
return true;
const SourceInfo &E = S.Current->getSource(OpPC);
S.FFDiag(E, diag::note_constexpr_pure_virtual_call, 1) << MD;
S.Note(MD->getLocation(), diag::note_declared_at);
return false;
}
bool CheckFloatResult(InterpState &S, CodePtr OpPC, const Floating &Result,
APFloat::opStatus Status) {
const SourceInfo &E = S.Current->getSource(OpPC);
// [expr.pre]p4:
// If during the evaluation of an expression, the result is not
// mathematically defined [...], the behavior is undefined.
// FIXME: C++ rules require us to not conform to IEEE 754 here.
if (Result.isNan()) {
S.CCEDiag(E, diag::note_constexpr_float_arithmetic)
<< /*NaN=*/true << S.Current->getRange(OpPC);
return S.noteUndefinedBehavior();
}
// In a constant context, assume that any dynamic rounding mode or FP
// exception state matches the default floating-point environment.
if (S.inConstantContext())
return true;
FPOptions FPO = E.asExpr()->getFPFeaturesInEffect(S.Ctx.getLangOpts());
if ((Status & APFloat::opInexact) &&
FPO.getRoundingMode() == llvm::RoundingMode::Dynamic) {
// Inexact result means that it depends on rounding mode. If the requested
// mode is dynamic, the evaluation cannot be made in compile time.
S.FFDiag(E, diag::note_constexpr_dynamic_rounding);
return false;
}
if ((Status != APFloat::opOK) &&
(FPO.getRoundingMode() == llvm::RoundingMode::Dynamic ||
FPO.getExceptionMode() != LangOptions::FPE_Ignore ||
FPO.getAllowFEnvAccess())) {
S.FFDiag(E, diag::note_constexpr_float_arithmetic_strict);
return false;
}
if ((Status & APFloat::opStatus::opInvalidOp) &&
FPO.getExceptionMode() != LangOptions::FPE_Ignore) {
// There is no usefully definable result.
S.FFDiag(E);
return false;
}
return true;
}
static bool diagnoseUnknownDecl(InterpState &S, CodePtr OpPC,
const ValueDecl *D) {
const SourceInfo &E = S.Current->getSource(OpPC);
if (isa<ParmVarDecl>(D)) {
if (S.getLangOpts().CPlusPlus11) {
S.FFDiag(E, diag::note_constexpr_function_param_value_unknown) << D;
S.Note(D->getLocation(), diag::note_declared_at) << D->getSourceRange();
} else {
S.FFDiag(E);
}
} else if (const auto *VD = dyn_cast<VarDecl>(D)) {
if (!VD->getType().isConstQualified()) {
diagnoseNonConstVariable(S, OpPC, VD);
return false;
}
// const, but no initializer.
if (!VD->getAnyInitializer()) {
S.FFDiag(E, diag::note_constexpr_var_init_unknown, 1) << VD;
S.Note(VD->getLocation(), diag::note_declared_at) << VD->getSourceRange();
return false;
}
}
return false;
}
/// We aleady know the given DeclRefExpr is invalid for some reason,
/// now figure out why and print appropriate diagnostics.
bool CheckDeclRef(InterpState &S, CodePtr OpPC, const DeclRefExpr *DR) {
const ValueDecl *D = DR->getDecl();
return diagnoseUnknownDecl(S, OpPC, D);
}
bool CheckDummy(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
if (!Ptr.isDummy())
return true;
const Descriptor *Desc = Ptr.getDeclDesc();
const ValueDecl *D = Desc->asValueDecl();
if (!D)
return false;
return diagnoseUnknownDecl(S, OpPC, D);
}
bool CheckNonNullArgs(InterpState &S, CodePtr OpPC, const Function *F,
const CallExpr *CE, unsigned ArgSize) {
auto Args = llvm::ArrayRef(CE->getArgs(), CE->getNumArgs());
auto NonNullArgs = collectNonNullArgs(F->getDecl(), Args);
unsigned Offset = 0;
unsigned Index = 0;
for (const Expr *Arg : Args) {
if (NonNullArgs[Index] && Arg->getType()->isPointerType()) {
const Pointer &ArgPtr = S.Stk.peek<Pointer>(ArgSize - Offset);
if (ArgPtr.isZero()) {
const SourceLocation &Loc = S.Current->getLocation(OpPC);
S.CCEDiag(Loc, diag::note_non_null_attribute_failed);
return false;
}
}
Offset += align(primSize(S.Ctx.classify(Arg).value_or(PT_Ptr)));
++Index;
}
return true;
}
bool Interpret(InterpState &S, APValue &Result) {
// The current stack frame when we started Interpret().
// This is being used by the ops to determine wheter
// to return from this function and thus terminate
// interpretation.
const InterpFrame *StartFrame = S.Current;
assert(!S.Current->isRoot());
CodePtr PC = S.Current->getPC();
// Empty program.
if (!PC)
return true;
for (;;) {
auto Op = PC.read<Opcode>();
CodePtr OpPC = PC;
switch (Op) {
#define GET_INTERP
#include "Opcodes.inc"
#undef GET_INTERP
}
}
}
} // namespace interp
} // namespace clang
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