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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Internal per-function state used for AST-to-ClangIR code gen
//
//===----------------------------------------------------------------------===//
#ifndef CLANG_LIB_CIR_CODEGEN_CIRGENFUNCTION_H
#define CLANG_LIB_CIR_CODEGEN_CIRGENFUNCTION_H
#include "CIRGenBuilder.h"
#include "CIRGenModule.h"
#include "CIRGenTypeCache.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Decl.h"
#include "clang/AST/Type.h"
#include "clang/CIR/Dialect/IR/CIRDialect.h"
#include "clang/CIR/TypeEvaluationKind.h"
#include "llvm/ADT/ScopedHashTable.h"
namespace {
class ScalarExprEmitter;
} // namespace
namespace clang::CIRGen {
class CIRGenFunction : public CIRGenTypeCache {
public:
CIRGenModule &cgm;
private:
friend class ::ScalarExprEmitter;
/// The builder is a helper class to create IR inside a function. The
/// builder is stateful, in particular it keeps an "insertion point": this
/// is where the next operations will be introduced.
CIRGenBuilderTy &builder;
public:
clang::QualType fnRetTy;
/// This is the current function or global initializer that is generated code
/// for.
mlir::Operation *curFn = nullptr;
clang::ASTContext &getContext() const { return cgm.getASTContext(); }
CIRGenBuilderTy &getBuilder() { return builder; }
CIRGenModule &getCIRGenModule() { return cgm; }
const CIRGenModule &getCIRGenModule() const { return cgm; }
mlir::Type convertTypeForMem(QualType T);
mlir::Type convertType(clang::QualType T);
mlir::Type convertType(const TypeDecl *T) {
return convertType(getContext().getTypeDeclType(T));
}
/// Return the cir::TypeEvaluationKind of QualType \c type.
static cir::TypeEvaluationKind getEvaluationKind(clang::QualType type);
static bool hasScalarEvaluationKind(clang::QualType type) {
return getEvaluationKind(type) == cir::TEK_Scalar;
}
CIRGenFunction(CIRGenModule &cgm, CIRGenBuilderTy &builder,
bool suppressNewContext = false);
~CIRGenFunction();
CIRGenTypes &getTypes() const { return cgm.getTypes(); }
mlir::MLIRContext &getMLIRContext() { return cgm.getMLIRContext(); }
/// Use to track source locations across nested visitor traversals.
/// Always use a `SourceLocRAIIObject` to change currSrcLoc.
std::optional<mlir::Location> currSrcLoc;
class SourceLocRAIIObject {
CIRGenFunction &cgf;
std::optional<mlir::Location> oldLoc;
public:
SourceLocRAIIObject(CIRGenFunction &cgf, mlir::Location value) : cgf(cgf) {
if (cgf.currSrcLoc)
oldLoc = cgf.currSrcLoc;
cgf.currSrcLoc = value;
}
/// Can be used to restore the state early, before the dtor
/// is run.
void restore() { cgf.currSrcLoc = oldLoc; }
~SourceLocRAIIObject() { restore(); }
};
/// Helpers to convert Clang's SourceLocation to a MLIR Location.
mlir::Location getLoc(clang::SourceLocation srcLoc);
mlir::Location getLoc(clang::SourceRange srcLoc);
mlir::Location getLoc(mlir::Location lhs, mlir::Location rhs);
const clang::LangOptions &getLangOpts() const { return cgm.getLangOpts(); }
void finishFunction(SourceLocation endLoc);
mlir::LogicalResult emitFunctionBody(const clang::Stmt *body);
// Build CIR for a statement. useCurrentScope should be true if no
// new scopes need be created when finding a compound statement.
mlir::LogicalResult
emitStmt(const clang::Stmt *s, bool useCurrentScope,
llvm::ArrayRef<const Attr *> attrs = std::nullopt);
mlir::LogicalResult emitSimpleStmt(const clang::Stmt *s,
bool useCurrentScope);
void emitCompoundStmt(const clang::CompoundStmt &s);
void emitCompoundStmtWithoutScope(const clang::CompoundStmt &s);
mlir::LogicalResult emitReturnStmt(const clang::ReturnStmt &s);
/// Emit the computation of the specified expression of scalar type.
mlir::Value emitScalarExpr(const clang::Expr *e);
cir::FuncOp generateCode(clang::GlobalDecl gd, cir::FuncOp fn,
cir::FuncType funcType);
/// Emit code for the start of a function.
/// \param loc The location to be associated with the function.
/// \param startLoc The location of the function body.
void startFunction(clang::GlobalDecl gd, clang::QualType retTy,
cir::FuncOp fn, cir::FuncType funcType,
clang::SourceLocation loc, clang::SourceLocation startLoc);
};
} // namespace clang::CIRGen
#endif
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