4e7cf1b1ed
Add an `EvaluationResult` class. This contains the result either as a `Pointer` or as a `APValue`. This way, we can inspect the result of the evaluation and diagnose problems with it (e.g. uninitialized fields in global initializers or pointers pointing to things they shouldn't point to).
104 lines
2.9 KiB
C++
104 lines
2.9 KiB
C++
//===--- ByteCodeEmitter.h - Instruction emitter for the VM ---------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Defines the instruction emitters.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_AST_INTERP_LINKEMITTER_H
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#define LLVM_CLANG_AST_INTERP_LINKEMITTER_H
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#include "Context.h"
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#include "PrimType.h"
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#include "Program.h"
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#include "Source.h"
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namespace clang {
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namespace interp {
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enum Opcode : uint32_t;
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/// An emitter which links the program to bytecode for later use.
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class ByteCodeEmitter {
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protected:
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using LabelTy = uint32_t;
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using AddrTy = uintptr_t;
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using Local = Scope::Local;
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public:
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/// Compiles the function into the module.
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Function *compileFunc(const FunctionDecl *FuncDecl);
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protected:
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ByteCodeEmitter(Context &Ctx, Program &P) : Ctx(Ctx), P(P) {}
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virtual ~ByteCodeEmitter() {}
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/// Define a label.
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void emitLabel(LabelTy Label);
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/// Create a label.
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LabelTy getLabel() { return ++NextLabel; }
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/// Methods implemented by the compiler.
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virtual bool visitFunc(const FunctionDecl *E) = 0;
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virtual bool visitExpr(const Expr *E) = 0;
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virtual bool visitDecl(const VarDecl *E) = 0;
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/// Emits jumps.
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bool jumpTrue(const LabelTy &Label);
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bool jumpFalse(const LabelTy &Label);
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bool jump(const LabelTy &Label);
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bool fallthrough(const LabelTy &Label);
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/// Callback for local registration.
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Local createLocal(Descriptor *D);
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/// Parameter indices.
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llvm::DenseMap<const ParmVarDecl *, ParamOffset> Params;
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/// Lambda captures.
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llvm::DenseMap<const ValueDecl *, ParamOffset> LambdaCaptures;
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/// Offset of the This parameter in a lambda record.
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unsigned LambdaThisCapture = 0;
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/// Local descriptors.
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llvm::SmallVector<SmallVector<Local, 8>, 2> Descriptors;
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private:
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/// Current compilation context.
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Context &Ctx;
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/// Program to link to.
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Program &P;
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/// Index of the next available label.
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LabelTy NextLabel = 0;
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/// Offset of the next local variable.
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unsigned NextLocalOffset = 0;
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/// Label information for linker.
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llvm::DenseMap<LabelTy, unsigned> LabelOffsets;
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/// Location of label relocations.
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llvm::DenseMap<LabelTy, llvm::SmallVector<unsigned, 5>> LabelRelocs;
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/// Program code.
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std::vector<std::byte> Code;
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/// Opcode to expression mapping.
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SourceMap SrcMap;
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/// Returns the offset for a jump or records a relocation.
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int32_t getOffset(LabelTy Label);
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/// Emits an opcode.
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template <typename... Tys>
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bool emitOp(Opcode Op, const Tys &... Args, const SourceInfo &L);
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protected:
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#define GET_LINK_PROTO
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#include "Opcodes.inc"
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#undef GET_LINK_PROTO
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};
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} // namespace interp
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} // namespace clang
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#endif
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