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//===--- InterpFrame.cpp - Call Frame implementation for the 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 "InterpFrame.h"
#include "Boolean.h"
#include "Function.h"
#include "InterpStack.h"
#include "InterpState.h"
#include "Pointer.h"
#include "PrimType.h"
#include "Program.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclCXX.h"
using namespace clang;
using namespace clang::interp;
InterpFrame::InterpFrame(InterpState &S, const Function *Func,
InterpFrame *Caller, CodePtr RetPC)
: Caller(Caller), S(S), Func(Func), RetPC(RetPC),
ArgSize(Func ? Func->getArgSize() : 0),
Args(static_cast<char *>(S.Stk.top())), FrameOffset(S.Stk.size()) {
if (!Func)
return;
unsigned FrameSize = Func->getFrameSize();
if (FrameSize == 0)
return;
Locals = std::make_unique<char[]>(FrameSize);
for (auto &Scope : Func->scopes()) {
for (auto &Local : Scope.locals()) {
Block *B = new (localBlock(Local.Offset)) Block(Local.Desc);
B->invokeCtor();
InlineDescriptor *ID = localInlineDesc(Local.Offset);
ID->Desc = Local.Desc;
ID->IsActive = true;
ID->Offset = sizeof(InlineDescriptor);
ID->IsBase = false;
ID->IsFieldMutable = false;
ID->IsConst = false;
ID->IsInitialized = false;
}
}
}
InterpFrame::InterpFrame(InterpState &S, const Function *Func, CodePtr RetPC)
: InterpFrame(S, Func, S.Current, RetPC) {
// As per our calling convention, the this pointer is
// part of the ArgSize.
// If the function has RVO, the RVO pointer is first.
// If the fuction has a This pointer, that one is next.
// Then follow the actual arguments (but those are handled
// in getParamPointer()).
if (Func->hasRVO())
RVOPtr = stackRef<Pointer>(0);
if (Func->hasThisPointer()) {
if (Func->hasRVO())
This = stackRef<Pointer>(sizeof(Pointer));
else
This = stackRef<Pointer>(0);
}
}
InterpFrame::~InterpFrame() {
for (auto &Param : Params)
S.deallocate(reinterpret_cast<Block *>(Param.second.get()));
}
void InterpFrame::destroy(unsigned Idx) {
for (auto &Local : Func->getScope(Idx).locals()) {
S.deallocate(reinterpret_cast<Block *>(localBlock(Local.Offset)));
}
}
void InterpFrame::popArgs() {
for (PrimType Ty : Func->args_reverse())
TYPE_SWITCH(Ty, S.Stk.discard<T>());
}
template <typename T>
static void print(llvm::raw_ostream &OS, const T &V, ASTContext &, QualType) {
OS << V;
}
template <>
void print(llvm::raw_ostream &OS, const Pointer &P, ASTContext &Ctx,
QualType Ty) {
if (P.isZero()) {
OS << "nullptr";
return;
}
auto printDesc = [&OS, &Ctx](Descriptor *Desc) {
if (auto *D = Desc->asDecl()) {
// Subfields or named values.
if (auto *VD = dyn_cast<ValueDecl>(D)) {
OS << *VD;
return;
}
// Base classes.
if (isa<RecordDecl>(D)) {
return;
}
}
// Temporary expression.
if (auto *E = Desc->asExpr()) {
E->printPretty(OS, nullptr, Ctx.getPrintingPolicy());
return;
}
llvm_unreachable("Invalid descriptor type");
};
if (!Ty->isReferenceType())
OS << "&";
llvm::SmallVector<Pointer, 2> Levels;
for (Pointer F = P; !F.isRoot(); ) {
Levels.push_back(F);
F = F.isArrayElement() ? F.getArray().expand() : F.getBase();
}
printDesc(P.getDeclDesc());
for (const auto &It : Levels) {
if (It.inArray()) {
OS << "[" << It.expand().getIndex() << "]";
continue;
}
if (auto Index = It.getIndex()) {
OS << " + " << Index;
continue;
}
OS << ".";
printDesc(It.getFieldDesc());
}
}
void InterpFrame::describe(llvm::raw_ostream &OS) {
const FunctionDecl *F = getCallee();
auto *M = dyn_cast<CXXMethodDecl>(F);
if (M && M->isInstance() && !isa<CXXConstructorDecl>(F)) {
print(OS, This, S.getCtx(), S.getCtx().getRecordType(M->getParent()));
OS << "->";
}
OS << *F << "(";
unsigned Off = 0;
Off += Func->hasRVO() ? primSize(PT_Ptr) : 0;
Off += Func->hasThisPointer() ? primSize(PT_Ptr) : 0;
for (unsigned I = 0, N = F->getNumParams(); I < N; ++I) {
QualType Ty = F->getParamDecl(I)->getType();
PrimType PrimTy = S.Ctx.classify(Ty).value_or(PT_Ptr);
TYPE_SWITCH(PrimTy, print(OS, stackRef<T>(Off), S.getCtx(), Ty));
Off += align(primSize(PrimTy));
if (I + 1 != N)
OS << ", ";
}
OS << ")";
}
Frame *InterpFrame::getCaller() const {
if (Caller->Caller)
return Caller;
return S.getSplitFrame();
}
SourceLocation InterpFrame::getCallLocation() const {
if (!Caller->Func)
return S.getLocation(nullptr, {});
return S.getLocation(Caller->Func, RetPC - sizeof(uintptr_t));
}
const FunctionDecl *InterpFrame::getCallee() const {
return Func->getDecl();
}
Pointer InterpFrame::getLocalPointer(unsigned Offset) const {
assert(Offset < Func->getFrameSize() && "Invalid local offset.");
return Pointer(reinterpret_cast<Block *>(localBlock(Offset)),
sizeof(InlineDescriptor));
}
Pointer InterpFrame::getParamPointer(unsigned Off) {
// Return the block if it was created previously.
auto Pt = Params.find(Off);
if (Pt != Params.end()) {
return Pointer(reinterpret_cast<Block *>(Pt->second.get()));
}
// Allocate memory to store the parameter and the block metadata.
const auto &Desc = Func->getParamDescriptor(Off);
size_t BlockSize = sizeof(Block) + Desc.second->getAllocSize();
auto Memory = std::make_unique<char[]>(BlockSize);
auto *B = new (Memory.get()) Block(Desc.second);
// Copy the initial value.
TYPE_SWITCH(Desc.first, new (B->data()) T(stackRef<T>(Off)));
// Record the param.
Params.insert({Off, std::move(Memory)});
return Pointer(B);
}
SourceInfo InterpFrame::getSource(CodePtr PC) const {
return S.getSource(Func, PC);
}
const Expr *InterpFrame::getExpr(CodePtr PC) const {
return S.getExpr(Func, PC);
}
SourceLocation InterpFrame::getLocation(CodePtr PC) const {
return S.getLocation(Func, PC);
}
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