| // Copyright 2015 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef V8_WASM_AST_DECODER_H_ |
| #define V8_WASM_AST_DECODER_H_ |
| |
| #include "src/signature.h" |
| #include "src/wasm/wasm-opcodes.h" |
| #include "src/wasm/wasm-result.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| namespace compiler { // external declarations from compiler. |
| class WasmGraphBuilder; |
| } |
| |
| namespace wasm { |
| |
| typedef compiler::WasmGraphBuilder TFBuilder; |
| struct ModuleEnv; // forward declaration of module interface. |
| |
| // Interface the function environment during decoding, include the signature |
| // and number of locals. |
| struct FunctionEnv { |
| ModuleEnv* module; // module environment |
| FunctionSig* sig; // signature of this function |
| uint32_t local_int32_count; // number of int32 locals |
| uint32_t local_int64_count; // number of int64 locals |
| uint32_t local_float32_count; // number of float32 locals |
| uint32_t local_float64_count; // number of float64 locals |
| uint32_t total_locals; // sum of parameters and all locals |
| |
| bool IsValidLocal(uint32_t index) { return index < total_locals; } |
| uint32_t GetLocalCount() { return total_locals; } |
| LocalType GetLocalType(uint32_t index) { |
| if (index < static_cast<uint32_t>(sig->parameter_count())) { |
| return sig->GetParam(index); |
| } |
| index -= static_cast<uint32_t>(sig->parameter_count()); |
| if (index < local_int32_count) return kAstI32; |
| index -= local_int32_count; |
| if (index < local_int64_count) return kAstI64; |
| index -= local_int64_count; |
| if (index < local_float32_count) return kAstF32; |
| index -= local_float32_count; |
| if (index < local_float64_count) return kAstF64; |
| return kAstStmt; |
| } |
| |
| void AddLocals(LocalType type, uint32_t count) { |
| switch (type) { |
| case kAstI32: |
| local_int32_count += count; |
| break; |
| case kAstI64: |
| local_int64_count += count; |
| break; |
| case kAstF32: |
| local_float32_count += count; |
| break; |
| case kAstF64: |
| local_float64_count += count; |
| break; |
| default: |
| UNREACHABLE(); |
| } |
| total_locals += count; |
| DCHECK(total_locals == |
| (sig->parameter_count() + local_int32_count + local_int64_count + |
| local_float32_count + local_float64_count)); |
| } |
| |
| void SumLocals() { |
| total_locals = static_cast<uint32_t>(sig->parameter_count()) + |
| local_int32_count + local_int64_count + local_float32_count + |
| local_float64_count; |
| } |
| }; |
| |
| struct Tree; |
| typedef Result<Tree*> TreeResult; |
| |
| std::ostream& operator<<(std::ostream& os, const Tree& tree); |
| |
| TreeResult VerifyWasmCode(FunctionEnv* env, const byte* base, const byte* start, |
| const byte* end); |
| TreeResult BuildTFGraph(TFBuilder* builder, FunctionEnv* env, const byte* base, |
| const byte* start, const byte* end); |
| |
| inline TreeResult VerifyWasmCode(FunctionEnv* env, const byte* start, |
| const byte* end) { |
| return VerifyWasmCode(env, nullptr, start, end); |
| } |
| |
| inline TreeResult BuildTFGraph(TFBuilder* builder, FunctionEnv* env, |
| const byte* start, const byte* end) { |
| return BuildTFGraph(builder, env, nullptr, start, end); |
| } |
| |
| enum ReadUnsignedLEB128ErrorCode { kNoError, kInvalidLEB128, kMissingLEB128 }; |
| |
| ReadUnsignedLEB128ErrorCode ReadUnsignedLEB128Operand(const byte*, const byte*, |
| int*, uint32_t*); |
| |
| // Computes the length of the opcode at the given address. |
| int OpcodeLength(const byte* pc); |
| |
| // Computes the arity (number of sub-nodes) of the opcode at the given address. |
| int OpcodeArity(FunctionEnv* env, const byte* pc); |
| } // namespace wasm |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_WASM_AST_DECODER_H_ |