mirror of
https://github.com/llvm/llvm-project.git
synced 2025-04-29 10:16:05 +00:00
104 lines
2.9 KiB
C++
104 lines
2.9 KiB
C++
//===--- ByteCodeEmitter.h - Instruction emitter 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Defines the instruction emitters.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CLANG_AST_INTERP_LINKEMITTER_H
|
|
#define LLVM_CLANG_AST_INTERP_LINKEMITTER_H
|
|
|
|
#include "Context.h"
|
|
#include "PrimType.h"
|
|
#include "Program.h"
|
|
#include "Source.h"
|
|
|
|
namespace clang {
|
|
namespace interp {
|
|
enum Opcode : uint32_t;
|
|
|
|
/// An emitter which links the program to bytecode for later use.
|
|
class ByteCodeEmitter {
|
|
protected:
|
|
using LabelTy = uint32_t;
|
|
using AddrTy = uintptr_t;
|
|
using Local = Scope::Local;
|
|
|
|
public:
|
|
/// Compiles the function into the module.
|
|
Function *compileFunc(const FunctionDecl *FuncDecl);
|
|
|
|
protected:
|
|
ByteCodeEmitter(Context &Ctx, Program &P) : Ctx(Ctx), P(P) {}
|
|
|
|
virtual ~ByteCodeEmitter() {}
|
|
|
|
/// Define a label.
|
|
void emitLabel(LabelTy Label);
|
|
/// Create a label.
|
|
LabelTy getLabel() { return ++NextLabel; }
|
|
|
|
/// Methods implemented by the compiler.
|
|
virtual bool visitFunc(const FunctionDecl *E) = 0;
|
|
virtual bool visitExpr(const Expr *E) = 0;
|
|
virtual bool visitDecl(const VarDecl *E) = 0;
|
|
|
|
/// Emits jumps.
|
|
bool jumpTrue(const LabelTy &Label);
|
|
bool jumpFalse(const LabelTy &Label);
|
|
bool jump(const LabelTy &Label);
|
|
bool fallthrough(const LabelTy &Label);
|
|
|
|
/// Callback for local registration.
|
|
Local createLocal(Descriptor *D);
|
|
|
|
/// Parameter indices.
|
|
llvm::DenseMap<const ParmVarDecl *, ParamOffset> Params;
|
|
/// Lambda captures.
|
|
llvm::DenseMap<const ValueDecl *, ParamOffset> LambdaCaptures;
|
|
/// Offset of the This parameter in a lambda record.
|
|
ParamOffset LambdaThisCapture{0, false};
|
|
/// Local descriptors.
|
|
llvm::SmallVector<SmallVector<Local, 8>, 2> Descriptors;
|
|
|
|
private:
|
|
/// Current compilation context.
|
|
Context &Ctx;
|
|
/// Program to link to.
|
|
Program &P;
|
|
/// Index of the next available label.
|
|
LabelTy NextLabel = 0;
|
|
/// Offset of the next local variable.
|
|
unsigned NextLocalOffset = 0;
|
|
/// Label information for linker.
|
|
llvm::DenseMap<LabelTy, unsigned> LabelOffsets;
|
|
/// Location of label relocations.
|
|
llvm::DenseMap<LabelTy, llvm::SmallVector<unsigned, 5>> LabelRelocs;
|
|
/// Program code.
|
|
std::vector<std::byte> Code;
|
|
/// Opcode to expression mapping.
|
|
SourceMap SrcMap;
|
|
|
|
/// Returns the offset for a jump or records a relocation.
|
|
int32_t getOffset(LabelTy Label);
|
|
|
|
/// Emits an opcode.
|
|
template <typename... Tys>
|
|
bool emitOp(Opcode Op, const Tys &... Args, const SourceInfo &L);
|
|
|
|
protected:
|
|
#define GET_LINK_PROTO
|
|
#include "Opcodes.inc"
|
|
#undef GET_LINK_PROTO
|
|
};
|
|
|
|
} // namespace interp
|
|
} // namespace clang
|
|
|
|
#endif
|