113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
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//===--- 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 "ByteCodeGenError.h"
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#include "Context.h"
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#include "InterpStack.h"
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#include "InterpState.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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#include "llvm/Support/Error.h"
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namespace clang {
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namespace interp {
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class Context;
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class SourceInfo;
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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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llvm::Expected<Function *> compileFunc(const FunctionDecl *F);
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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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/// Bails out if a given node cannot be compiled.
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bool bail(const Stmt *S) { return bail(S->getBeginLoc()); }
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bool bail(const Decl *D) { return bail(D->getBeginLoc()); }
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bool bail(const SourceLocation &Loc);
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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 *, unsigned> Params;
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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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/// Location of a failure.
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llvm::Optional<SourceLocation> BailLocation;
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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<char> 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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