Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #ifndef V8_WASM_AST_DECODER_H_ |
| 6 | #define V8_WASM_AST_DECODER_H_ |
| 7 | |
| 8 | #include "src/signature.h" |
| 9 | #include "src/wasm/wasm-opcodes.h" |
| 10 | #include "src/wasm/wasm-result.h" |
| 11 | |
| 12 | namespace v8 { |
| 13 | namespace internal { |
| 14 | |
| 15 | namespace compiler { // external declarations from compiler. |
| 16 | class WasmGraphBuilder; |
| 17 | } |
| 18 | |
| 19 | namespace wasm { |
| 20 | |
| 21 | typedef compiler::WasmGraphBuilder TFBuilder; |
| 22 | struct ModuleEnv; // forward declaration of module interface. |
| 23 | |
| 24 | // Interface the function environment during decoding, include the signature |
| 25 | // and number of locals. |
| 26 | struct FunctionEnv { |
| 27 | ModuleEnv* module; // module environment |
| 28 | FunctionSig* sig; // signature of this function |
| 29 | uint32_t local_int32_count; // number of int32 locals |
| 30 | uint32_t local_int64_count; // number of int64 locals |
| 31 | uint32_t local_float32_count; // number of float32 locals |
| 32 | uint32_t local_float64_count; // number of float64 locals |
| 33 | uint32_t total_locals; // sum of parameters and all locals |
| 34 | |
| 35 | bool IsValidLocal(uint32_t index) { return index < total_locals; } |
| 36 | uint32_t GetLocalCount() { return total_locals; } |
| 37 | LocalType GetLocalType(uint32_t index) { |
| 38 | if (index < static_cast<uint32_t>(sig->parameter_count())) { |
| 39 | return sig->GetParam(index); |
| 40 | } |
| 41 | index -= static_cast<uint32_t>(sig->parameter_count()); |
| 42 | if (index < local_int32_count) return kAstI32; |
| 43 | index -= local_int32_count; |
| 44 | if (index < local_int64_count) return kAstI64; |
| 45 | index -= local_int64_count; |
| 46 | if (index < local_float32_count) return kAstF32; |
| 47 | index -= local_float32_count; |
| 48 | if (index < local_float64_count) return kAstF64; |
| 49 | return kAstStmt; |
| 50 | } |
| 51 | |
| 52 | void AddLocals(LocalType type, uint32_t count) { |
| 53 | switch (type) { |
| 54 | case kAstI32: |
| 55 | local_int32_count += count; |
| 56 | break; |
| 57 | case kAstI64: |
| 58 | local_int64_count += count; |
| 59 | break; |
| 60 | case kAstF32: |
| 61 | local_float32_count += count; |
| 62 | break; |
| 63 | case kAstF64: |
| 64 | local_float64_count += count; |
| 65 | break; |
| 66 | default: |
| 67 | UNREACHABLE(); |
| 68 | } |
| 69 | total_locals += count; |
| 70 | DCHECK(total_locals == |
| 71 | (sig->parameter_count() + local_int32_count + local_int64_count + |
| 72 | local_float32_count + local_float64_count)); |
| 73 | } |
| 74 | |
| 75 | void SumLocals() { |
| 76 | total_locals = static_cast<uint32_t>(sig->parameter_count()) + |
| 77 | local_int32_count + local_int64_count + local_float32_count + |
| 78 | local_float64_count; |
| 79 | } |
| 80 | }; |
| 81 | |
| 82 | struct Tree; |
| 83 | typedef Result<Tree*> TreeResult; |
| 84 | |
| 85 | std::ostream& operator<<(std::ostream& os, const Tree& tree); |
| 86 | |
| 87 | TreeResult VerifyWasmCode(FunctionEnv* env, const byte* base, const byte* start, |
| 88 | const byte* end); |
| 89 | TreeResult BuildTFGraph(TFBuilder* builder, FunctionEnv* env, const byte* base, |
| 90 | const byte* start, const byte* end); |
| 91 | |
| 92 | inline TreeResult VerifyWasmCode(FunctionEnv* env, const byte* start, |
| 93 | const byte* end) { |
| 94 | return VerifyWasmCode(env, nullptr, start, end); |
| 95 | } |
| 96 | |
| 97 | inline TreeResult BuildTFGraph(TFBuilder* builder, FunctionEnv* env, |
| 98 | const byte* start, const byte* end) { |
| 99 | return BuildTFGraph(builder, env, nullptr, start, end); |
| 100 | } |
| 101 | |
| 102 | enum ReadUnsignedLEB128ErrorCode { kNoError, kInvalidLEB128, kMissingLEB128 }; |
| 103 | |
| 104 | ReadUnsignedLEB128ErrorCode ReadUnsignedLEB128Operand(const byte*, const byte*, |
| 105 | int*, uint32_t*); |
| 106 | |
| 107 | // Computes the length of the opcode at the given address. |
| 108 | int OpcodeLength(const byte* pc); |
| 109 | |
| 110 | // Computes the arity (number of sub-nodes) of the opcode at the given address. |
| 111 | int OpcodeArity(FunctionEnv* env, const byte* pc); |
| 112 | } // namespace wasm |
| 113 | } // namespace internal |
| 114 | } // namespace v8 |
| 115 | |
| 116 | #endif // V8_WASM_AST_DECODER_H_ |