nand created this revision.
nand added reviewers: Bigcheese, jfb, rsmith, dexonsmith.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.
Added support for:
- for
- switch
- do-while
- while
Also implemented assignment to enable useful tests.
The patch also includes range-based for loops which are
not yet tested, but having them in ByteCodeStmtGen should
simplify the process of slicing off further patches.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D70086
Files:
clang/lib/AST/Interp/ByteCodeEmitter.cpp
clang/lib/AST/Interp/ByteCodeExprGen.cpp
clang/lib/AST/Interp/ByteCodeExprGen.h
clang/lib/AST/Interp/ByteCodeStmtGen.cpp
clang/lib/AST/Interp/ByteCodeStmtGen.h
clang/lib/AST/Interp/Context.cpp
clang/lib/AST/Interp/Context.h
clang/lib/AST/Interp/EvalEmitter.cpp
clang/lib/AST/Interp/InterpLoop.cpp
clang/lib/AST/Interp/Opcodes.td
clang/lib/AST/Interp/Opcodes/Comparison.h
clang/test/AST/Interp/flow.cpp
Index: clang/test/AST/Interp/flow.cpp
===================================================================
--- /dev/null
+++ clang/test/AST/Interp/flow.cpp
@@ -0,0 +1,116 @@
+// RUN: %clang_cc1 -std=c++17 -fsyntax-only -fexperimental-new-constant-interpreter %s -verify
+// RUN: %clang_cc1 -std=c++17 -fsyntax-only %s -verify
+// expected-no-diagnostics
+
+constexpr int fn_for_break(int n) {
+ int x = 0;
+ for (int i = 0; i < 20; i = i + 1) {
+ if (i == n)
+ break;
+ x = x + 1;
+ }
+ return x;
+}
+using A = int[5];
+using A = int[fn_for_break(5)];
+
+constexpr int fn_for_cont(int n) {
+ int x = 0;
+ for (int i = 0; i < 20; i = i + 1) {
+ if (i < n)
+ continue;
+ x = x + 1;
+ }
+ return x;
+}
+using B = int[15];
+using B = int[fn_for_cont(5)];
+
+constexpr int fn_while_break(unsigned n) {
+ int x = 0;
+ int i = 0;
+ while (int next = i = i + 1) {
+ if (next == n) {
+ break;
+ }
+ x = x + 1;
+ }
+ return x;
+}
+using C = int[4];
+using C = int[fn_while_break(5)];
+
+constexpr int fn_while_cont(unsigned n) {
+ int x = 0;
+ int i = 0;
+ while (i < 10) {
+ i = i + 1;
+ if (i < n) {
+ continue;
+ }
+ x = x + 1;
+ }
+ return x;
+}
+using D = int[6];
+using D = int[fn_while_cont(5)];
+
+constexpr int fn_do_break(unsigned n) {
+ int x = 0;
+ int i = 0;
+ do {
+ if (i == n) {
+ break;
+ }
+ x = x + 1;
+ i = i + 1;
+ } while (i < 20);
+ return x;
+}
+using E = int[5];
+using E = int[fn_do_break(5)];
+
+constexpr int fn_do_continue(unsigned n) {
+ int x = 0;
+ int i = 0;
+ do {
+ i = i + 1;
+ if (i < n) {
+ continue;
+ }
+ x = x + 1;
+ } while (i < 20);
+ return x;
+}
+using F = int[16];
+using F = int[fn_do_continue(5)];
+
+constexpr int fn_for_cond_var(int n) {
+ int a = 0;
+ for (int i = n; int b = a + 1; i = i + 1) {
+ if (i == 50) {
+ a = 0 - b;
+ }
+ }
+ return a - 1;
+}
+
+using G = int[-fn_for_cond_var(10)];
+using G = int[2];
+
+constexpr int fn_switch(int a) {
+ switch (a) {
+ case 0: return 2;
+ case 1: return 5;
+ default: return 6;
+ }
+}
+
+using H0 = int[2];
+using H0 = int[fn_switch(0)];
+
+using H1 = int[5];
+using H1 = int[fn_switch(1)];
+
+using H2 = int[6];
+using H2 = int[fn_switch(2)];
Index: clang/lib/AST/Interp/Opcodes/Comparison.h
===================================================================
--- clang/lib/AST/Interp/Opcodes/Comparison.h
+++ clang/lib/AST/Interp/Opcodes/Comparison.h
@@ -118,4 +118,15 @@
return false;
}
+template <PrimType Name>
+bool InRange(InterpState &S, CodePtr OpPC) {
+ using T = typename PrimConv<Name>::T;
+ const T &RHS = S.Stk.pop<T>();
+ const T &LHS = S.Stk.pop<T>();
+ const T &Value = S.Stk.pop<T>();
+
+ S.Stk.push<bool>(LHS <= Value && Value <= RHS);
+ return true;
+}
+
#endif
Index: clang/lib/AST/Interp/Opcodes.td
===================================================================
--- clang/lib/AST/Interp/Opcodes.td
+++ clang/lib/AST/Interp/Opcodes.td
@@ -339,6 +339,16 @@
def GT : ComparisonOpcode;
def GE : ComparisonOpcode;
+//===----------------------------------------------------------------------===//
+// Range test.
+//===----------------------------------------------------------------------===//
+
+// [Real, Real, Real] -> [Bool]
+def InRange : Opcode {
+ let Types = [AluFPTypeClass];
+ let HasGroup = 1;
+}
+
//===----------------------------------------------------------------------===//
// Stack management.
//===----------------------------------------------------------------------===//
Index: clang/lib/AST/Interp/InterpLoop.cpp
===================================================================
--- clang/lib/AST/Interp/InterpLoop.cpp
+++ clang/lib/AST/Interp/InterpLoop.cpp
@@ -108,6 +108,8 @@
return false;
if (S.checkingPotentialConstantExpression())
return false;
+ if (!F->isConstexpr())
+ return false;
// Adjust the state.
S.CallStackDepth++;
Index: clang/lib/AST/Interp/EvalEmitter.cpp
===================================================================
--- clang/lib/AST/Interp/EvalEmitter.cpp
+++ clang/lib/AST/Interp/EvalEmitter.cpp
@@ -177,6 +177,8 @@
return false;
if (S.checkingPotentialConstantExpression())
return false;
+ if (!F->isConstexpr())
+ return false;
S.Current = new InterpFrame(S, F, S.Current, OpPC, std::move(This));
return Interpret(S, Result);
}
Index: clang/lib/AST/Interp/Context.h
===================================================================
--- clang/lib/AST/Interp/Context.h
+++ clang/lib/AST/Interp/Context.h
@@ -70,13 +70,6 @@
/// Classifies an expression.
llvm::Optional<PrimType> classify(QualType T);
-private:
- /// Runs a function.
- bool Run(State &Parent, Function *Func, APValue &Result);
-
- /// Checks a result fromt the interpreter.
- bool Check(State &Parent, llvm::Expected<bool> &&R);
-
private:
/// Current compilation context.
ASTContext &Ctx;
Index: clang/lib/AST/Interp/Context.cpp
===================================================================
--- clang/lib/AST/Interp/Context.cpp
+++ clang/lib/AST/Interp/Context.cpp
@@ -26,6 +26,8 @@
Context::~Context() {}
bool Context::isPotentialConstantExpr(State &Parent, const FunctionDecl *FD) {
+ // Try to compile the function. This either produces an error message (if this
+ // is the first attempt to compile) or returns a dummy function with no body.
Function *Func = P->getFunction(FD);
if (!Func) {
ByteCodeStmtGen<ByteCodeEmitter> C(*this, *P, Parent);
@@ -39,22 +41,43 @@
}
}
+ // If function has no body, it is definitely not constexpr.
if (!Func->isConstexpr())
return false;
- APValue Dummy;
- return Run(Parent, Func, Dummy);
+ // Run the function in a dummy context.
+ APValue DummyResult;
+ InterpState State(Parent, *P, Stk, *this);
+ State.Current = new InterpFrame(State, Func, nullptr, {}, {});
+ if (Interpret(State, DummyResult))
+ return true;
+ Stk.clear();
+ return false;
}
bool Context::evaluateAsRValue(State &Parent, const Expr *E, APValue &Result) {
ByteCodeExprGen<EvalEmitter> C(*this, *P, Parent, Stk, Result);
- return Check(Parent, C.interpretExpr(E));
+ if (auto Flag = C.interpretExpr(E)) {
+ return *Flag;
+ } else {
+ handleAllErrors(Flag.takeError(), [&Parent](ByteCodeGenError &Err) {
+ Parent.FFDiag(Err.getLoc(), diag::err_experimental_clang_interp_failed);
+ });
+ return false;
+ }
}
bool Context::evaluateAsInitializer(State &Parent, const VarDecl *VD,
APValue &Result) {
ByteCodeExprGen<EvalEmitter> C(*this, *P, Parent, Stk, Result);
- return Check(Parent, C.interpretDecl(VD));
+ if (auto Flag = C.interpretDecl(VD)) {
+ return *Flag;
+ } else {
+ handleAllErrors(Flag.takeError(), [&Parent](ByteCodeGenError &Err) {
+ Parent.FFDiag(Err.getLoc(), diag::err_experimental_clang_interp_failed);
+ });
+ return false;
+ }
}
const LangOptions &Context::getLangOpts() const { return Ctx.getLangOpts(); }
@@ -114,21 +137,3 @@
unsigned Context::getCharBit() const {
return Ctx.getTargetInfo().getCharWidth();
}
-
-bool Context::Run(State &Parent, Function *Func, APValue &Result) {
- InterpState State(Parent, *P, Stk, *this);
- State.Current = new InterpFrame(State, Func, nullptr, {}, {});
- if (Interpret(State, Result))
- return true;
- Stk.clear();
- return false;
-}
-
-bool Context::Check(State &Parent, llvm::Expected<bool> &&Flag) {
- if (Flag)
- return *Flag;
- handleAllErrors(Flag.takeError(), [&Parent](ByteCodeGenError &Err) {
- Parent.FFDiag(Err.getLoc(), diag::err_experimental_clang_interp_failed);
- });
- return false;
-}
Index: clang/lib/AST/Interp/ByteCodeStmtGen.h
===================================================================
--- clang/lib/AST/Interp/ByteCodeStmtGen.h
+++ clang/lib/AST/Interp/ByteCodeStmtGen.h
@@ -60,8 +60,16 @@
bool visitStmt(const Stmt *S);
bool visitCompoundStmt(const CompoundStmt *S);
bool visitDeclStmt(const DeclStmt *DS);
+ bool visitForStmt(const ForStmt *FS);
+ bool visitWhileStmt(const WhileStmt *DS);
+ bool visitDoStmt(const DoStmt *DS);
bool visitReturnStmt(const ReturnStmt *RS);
bool visitIfStmt(const IfStmt *IS);
+ bool visitBreakStmt(const BreakStmt *BS);
+ bool visitContinueStmt(const ContinueStmt *CS);
+ bool visitSwitchStmt(const SwitchStmt *SS);
+ bool visitCaseStmt(const SwitchCase *CS);
+ bool visitCXXForRangeStmt(const CXXForRangeStmt *FS);
/// Compiles a variable declaration.
bool visitVarDecl(const VarDecl *VD);
Index: clang/lib/AST/Interp/ByteCodeStmtGen.cpp
===================================================================
--- clang/lib/AST/Interp/ByteCodeStmtGen.cpp
+++ clang/lib/AST/Interp/ByteCodeStmtGen.cpp
@@ -118,10 +118,27 @@
return visitCompoundStmt(cast<CompoundStmt>(S));
case Stmt::DeclStmtClass:
return visitDeclStmt(cast<DeclStmt>(S));
+ case Stmt::ForStmtClass:
+ return visitForStmt(cast<ForStmt>(S));
+ case Stmt::WhileStmtClass:
+ return visitWhileStmt(cast<WhileStmt>(S));
+ case Stmt::DoStmtClass:
+ return visitDoStmt(cast<DoStmt>(S));
case Stmt::ReturnStmtClass:
return visitReturnStmt(cast<ReturnStmt>(S));
case Stmt::IfStmtClass:
return visitIfStmt(cast<IfStmt>(S));
+ case Stmt::BreakStmtClass:
+ return visitBreakStmt(cast<BreakStmt>(S));
+ case Stmt::ContinueStmtClass:
+ return visitContinueStmt(cast<ContinueStmt>(S));
+ case Stmt::SwitchStmtClass:
+ return visitSwitchStmt(cast<SwitchStmt>(S));
+ case Stmt::CaseStmtClass:
+ case Stmt::DefaultStmtClass:
+ return visitCaseStmt(cast<SwitchCase>(S));
+ case Stmt::CXXForRangeStmtClass:
+ return visitCXXForRangeStmt(cast<CXXForRangeStmt>(S));
case Stmt::NullStmtClass:
return true;
default: {
@@ -136,9 +153,10 @@
bool ByteCodeStmtGen<Emitter>::visitCompoundStmt(
const CompoundStmt *CompoundStmt) {
BlockScope<Emitter> Scope(this);
- for (auto *InnerStmt : CompoundStmt->body())
+ for (auto *InnerStmt : CompoundStmt->body()) {
if (!visitStmt(InnerStmt))
return false;
+ }
return true;
}
@@ -161,6 +179,114 @@
return true;
}
+template <class Emitter>
+bool ByteCodeStmtGen<Emitter>::visitForStmt(const ForStmt *FS) {
+ // Compile the initialisation statement in an outer scope.
+ BlockScope<Emitter> OuterScope(this);
+ if (auto *Init = FS->getInit())
+ if (!visitStmt(Init))
+ return false;
+
+ LabelTy LabelStart = this->getLabel();
+ LabelTy LabelEnd = this->getLabel();
+
+ // Compile the condition, body and increment in the loop scope.
+ this->emitLabel(LabelStart);
+ {
+ BlockScope<Emitter> InnerScope(this);
+
+ if (auto *Cond = FS->getCond()) {
+ if (auto *CondDecl = FS->getConditionVariableDeclStmt())
+ if (!visitDeclStmt(CondDecl))
+ return false;
+
+ if (!this->visit(Cond))
+ return false;
+
+ if (!this->jumpFalse(LabelEnd))
+ return false;
+ }
+
+ if (auto *Body = FS->getBody()) {
+ LabelTy LabelSkip = this->getLabel();
+ LoopScope<Emitter> FlowScope(this, LabelEnd, LabelSkip);
+ if (!visitStmt(Body))
+ return false;
+ this->emitLabel(LabelSkip);
+ }
+
+ if (auto *Inc = FS->getInc()) {
+ ExprScope<Emitter> IncScope(this);
+ if (!this->discard(Inc))
+ return false;
+ }
+ if (!this->jump(LabelStart))
+ return false;
+ }
+ this->emitLabel(LabelEnd);
+ return true;
+}
+
+template <class Emitter>
+bool ByteCodeStmtGen<Emitter>::visitWhileStmt(const WhileStmt *WS) {
+ LabelTy LabelStart = this->getLabel();
+ LabelTy LabelEnd = this->getLabel();
+
+ this->emitLabel(LabelStart);
+ {
+ BlockScope<Emitter> InnerScope(this);
+ if (auto *CondDecl = WS->getConditionVariableDeclStmt())
+ if (!visitDeclStmt(CondDecl))
+ return false;
+
+ if (!this->visit(WS->getCond()))
+ return false;
+
+ if (!this->jumpFalse(LabelEnd))
+ return false;
+
+ {
+ LoopScope<Emitter> FlowScope(this, LabelEnd, LabelStart);
+ if (!visitStmt(WS->getBody()))
+ return false;
+ }
+ if (!this->jump(LabelStart))
+ return false;
+ }
+ this->emitLabel(LabelEnd);
+
+ return true;
+}
+
+template <class Emitter>
+bool ByteCodeStmtGen<Emitter>::visitDoStmt(const DoStmt *DS) {
+ LabelTy LabelStart = this->getLabel();
+ LabelTy LabelEnd = this->getLabel();
+ LabelTy LabelSkip = this->getLabel();
+
+ this->emitLabel(LabelStart);
+ {
+ {
+ LoopScope<Emitter> FlowScope(this, LabelEnd, LabelSkip);
+ if (!visitStmt(DS->getBody()))
+ return false;
+ this->emitLabel(LabelSkip);
+ }
+
+ {
+ ExprScope<Emitter> CondScope(this);
+ if (!this->visitBool(DS->getCond()))
+ return false;
+ }
+
+ if (!this->jumpTrue(LabelStart))
+ return false;
+ }
+ this->emitLabel(LabelEnd);
+
+ return true;
+}
+
template <class Emitter>
bool ByteCodeStmtGen<Emitter>::visitReturnStmt(const ReturnStmt *RS) {
if (const Expr *RE = RS->getRetValue()) {
@@ -222,6 +348,167 @@
return true;
}
+template <class Emitter>
+bool ByteCodeStmtGen<Emitter>::visitBreakStmt(const BreakStmt *BS) {
+ if (!BreakLabel)
+ return this->bail(BS);
+ return this->jump(*BreakLabel);
+}
+
+template <class Emitter>
+bool ByteCodeStmtGen<Emitter>::visitContinueStmt(const ContinueStmt *CS) {
+ if (!ContinueLabel)
+ return this->bail(CS);
+ return this->jump(*ContinueLabel);
+}
+
+template <class Emitter>
+bool ByteCodeStmtGen<Emitter>::visitSwitchStmt(const SwitchStmt *SS) {
+ BlockScope<Emitter> InnerScope(this);
+
+ if (Optional<PrimType> T = this->classify(SS->getCond()->getType())) {
+ // The condition is stored in a local and fetched for every test.
+ unsigned Off = this->allocateLocalPrimitive(SS->getCond(), *T,
+ /*isConst=*/true);
+
+ // Compile the condition in its own scope.
+ {
+ ExprScope<Emitter> CondScope(this);
+ if (const Stmt *CondInit = SS->getInit())
+ if (!visitStmt(SS->getInit()))
+ return false;
+
+ if (const DeclStmt *CondDecl = SS->getConditionVariableDeclStmt())
+ if (!visitDeclStmt(CondDecl))
+ return false;
+
+ if (!this->visit(SS->getCond()))
+ return false;
+
+ if (!this->emitSetLocal(*T, Off, SS->getCond()))
+ return false;
+ }
+
+ LabelTy LabelEnd = this->getLabel();
+
+ // Generate code to inspect all case labels, jumping to the matched one.
+ const DefaultStmt *Default = nullptr;
+ CaseMap Labels;
+ for (auto *SC = SS->getSwitchCaseList(); SC; SC = SC->getNextSwitchCase()) {
+ LabelTy Label = this->getLabel();
+ Labels.insert({SC, Label});
+
+ if (auto *DS = dyn_cast<DefaultStmt>(SC)) {
+ Default = DS;
+ continue;
+ }
+
+ if (auto *CS = dyn_cast<CaseStmt>(SC)) {
+ if (!this->emitGetLocal(*T, Off, CS))
+ return false;
+ if (!this->visit(CS->getLHS()))
+ return false;
+
+ if (auto *RHS = CS->getRHS()) {
+ if (!this->visit(CS->getRHS()))
+ return false;
+ if (!this->emitInRange(*T, CS))
+ return false;
+ } else {
+ if (!this->emitEQ(*T, CS))
+ return false;
+ }
+
+ if (!this->jumpTrue(Label))
+ return false;
+ continue;
+ }
+
+ return this->bail(SS);
+ }
+
+ // If a case wasn't matched, jump to default or skip the body.
+ if (!this->jump(Default ? Labels[Default] : LabelEnd))
+ return false;
+ OptLabelTy DefaultLabel = Default ? Labels[Default] : OptLabelTy{};
+
+ // Compile the body, using labels defined previously.
+ SwitchScope<Emitter> LabelScope(this, std::move(Labels), LabelEnd,
+ DefaultLabel);
+ if (!visitStmt(SS->getBody()))
+ return false;
+ this->emitLabel(LabelEnd);
+ return true;
+ } else {
+ return this->bail(SS);
+ }
+}
+
+template <class Emitter>
+bool ByteCodeStmtGen<Emitter>::visitCaseStmt(const SwitchCase *CS) {
+ auto It = CaseLabels.find(CS);
+ if (It == CaseLabels.end())
+ return this->bail(CS);
+
+ this->emitLabel(It->second);
+ return visitStmt(CS->getSubStmt());
+}
+
+template <class Emitter>
+bool ByteCodeStmtGen<Emitter>::visitCXXForRangeStmt(const CXXForRangeStmt *FS) {
+ BlockScope<Emitter> Scope(this);
+
+ // Emit the optional init-statement.
+ if (auto *Init = FS->getInit()) {
+ if (!visitStmt(Init))
+ return false;
+ }
+
+ // Initialise the __range variable.
+ if (!visitStmt(FS->getRangeStmt()))
+ return false;
+
+ // Create the __begin and __end iterators.
+ if (!visitStmt(FS->getBeginStmt()) || !visitStmt(FS->getEndStmt()))
+ return false;
+
+ LabelTy LabelStart = this->getLabel();
+ LabelTy LabelEnd = this->getLabel();
+
+ this->emitLabel(LabelStart);
+ {
+ // Lower the condition.
+ if (!this->visitBool(FS->getCond()))
+ return false;
+ if (!this->jumpFalse(LabelEnd))
+ return false;
+
+ // Lower the loop var and body, marking labels for continue/break.
+ {
+ BlockScope<Emitter> InnerScope(this);
+ if (!visitStmt(FS->getLoopVarStmt()))
+ return false;
+
+ LabelTy LabelSkip = this->getLabel();
+ {
+ LoopScope<Emitter> FlowScope(this, LabelEnd, LabelSkip);
+
+ if (!visitStmt(FS->getBody()))
+ return false;
+ }
+ this->emitLabel(LabelSkip);
+ }
+
+ // Increment: ++__begin
+ if (!visitStmt(FS->getInc()))
+ return false;
+ if (!this->jump(LabelStart))
+ return false;
+ }
+ this->emitLabel(LabelEnd);
+ return true;
+}
+
template <class Emitter>
bool ByteCodeStmtGen<Emitter>::visitVarDecl(const VarDecl *VD) {
auto DT = VD->getType();
Index: clang/lib/AST/Interp/ByteCodeExprGen.h
===================================================================
--- clang/lib/AST/Interp/ByteCodeExprGen.h
+++ clang/lib/AST/Interp/ByteCodeExprGen.h
@@ -76,6 +76,10 @@
bool VisitUnaryMinus(const UnaryOperator *E);
bool VisitCallExpr(const CallExpr *E);
+ // Fallback methods for nodes which are not yet implemented.
+ bool VisitStmt(const Stmt *E) { llvm_unreachable("not an expression"); }
+ bool VisitExpr(const Expr *E) { return this->bail(E); }
+
protected:
bool visitExpr(const Expr *E) override;
bool visitDecl(const VarDecl *VD) override;
@@ -146,6 +150,8 @@
bool emitFunctionCall(const FunctionDecl *Callee, llvm::Optional<PrimType> T,
const Expr *Call);
+ bool visitAssign(PrimType T, const BinaryOperator *BO);
+
enum class DerefKind {
/// Value is read and pushed to stack.
Read,
Index: clang/lib/AST/Interp/ByteCodeExprGen.cpp
===================================================================
--- clang/lib/AST/Interp/ByteCodeExprGen.cpp
+++ clang/lib/AST/Interp/ByteCodeExprGen.cpp
@@ -300,6 +300,9 @@
};
switch (BO->getOpcode()) {
+ case BO_Assign:
+ return visitAssign(*T, BO);
+
case BO_EQ: return Discard(this->emitEQ(*LT, BO));
case BO_NE: return Discard(this->emitNE(*LT, BO));
case BO_LT: return Discard(this->emitLT(*LT, BO));
@@ -372,8 +375,10 @@
return false;
}
} else {
- consumeError(Func.takeError());
- return this->bail(E);
+ handleAllErrors(Func.takeError(), [this](ByteCodeGenError &Err) {
+ S.FFDiag(Err.getLoc(), diag::err_experimental_clang_interp_failed);
+ });
+ return false;
}
return DiscardResult && T ? this->emitPop(*T, E) : true;
}
@@ -410,6 +415,31 @@
}
}
+template <class Emitter>
+bool ByteCodeExprGen<Emitter>::visitAssign(PrimType T,
+ const BinaryOperator *BO) {
+ return dereference(
+ BO->getLHS(), DerefKind::Write,
+ [this, BO](PrimType) {
+ // Generate a value to store - will be set.
+ return visit(BO->getRHS());
+ },
+ [this, BO](PrimType T) {
+ // Pointer on stack - compile RHS and assign to pointer.
+ if (!visit(BO->getRHS()))
+ return false;
+
+ if (BO->getLHS()->refersToBitField()) {
+ return this->bail(BO);
+ } else {
+ if (DiscardResult)
+ return this->emitStorePop(T, BO);
+ else
+ return this->emitStore(T, BO);
+ }
+ });
+}
+
template <class Emitter>
bool ByteCodeExprGen<Emitter>::dereference(
const Expr *LV, DerefKind AK, llvm::function_ref<bool(PrimType)> Direct,
Index: clang/lib/AST/Interp/ByteCodeEmitter.cpp
===================================================================
--- clang/lib/AST/Interp/ByteCodeEmitter.cpp
+++ clang/lib/AST/Interp/ByteCodeEmitter.cpp
@@ -57,12 +57,17 @@
Function *Func = P.createFunction(F, ParamOffset, std::move(ParamTypes),
std::move(ParamDescriptors));
// Compile the function body.
- if (!F->isConstexpr() || !visitFunc(F)) {
- // Return a dummy function if compilation failed.
- if (BailLocation)
+ if (!F->isConstexpr()) {
+ // Return a dummy function for non-constexpr.
+ return Func;
+ } else if (!visitFunc(F)) {
+ if (BailLocation) {
+ // If compiler bailed, return an error.
return llvm::make_error<ByteCodeGenError>(*BailLocation);
- else
+ } else {
+ // Otherwise, return a dummy function which is not constexpr.
return Func;
+ }
} else {
// Create scopes from descriptors.
llvm::SmallVector<Scope, 2> Scopes;
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