LCOV - code coverage report
Current view: top level - src/wasm - wasm-text.cc (source / functions) Hit Total Coverage
Test: app.info Lines: 70 90 77.8 %
Date: 2017-10-20 Functions: 2 2 100.0 %

          Line data    Source code
       1             : // Copyright 2016 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             : #include "src/wasm/wasm-text.h"
       6             : 
       7             : #include "src/debug/interface-types.h"
       8             : #include "src/objects-inl.h"
       9             : #include "src/ostreams.h"
      10             : #include "src/vector.h"
      11             : #include "src/wasm/function-body-decoder-impl.h"
      12             : #include "src/wasm/function-body-decoder.h"
      13             : #include "src/wasm/wasm-module.h"
      14             : #include "src/wasm/wasm-opcodes.h"
      15             : #include "src/zone/zone.h"
      16             : 
      17             : namespace v8 {
      18             : namespace internal {
      19             : namespace wasm {
      20             : 
      21             : namespace {
      22          89 : bool IsValidFunctionName(const Vector<const char> &name) {
      23          89 :   if (name.is_empty()) return false;
      24             :   const char *special_chars = "_.+-*/\\^~=<>!?@#$%&|:'`";
      25         649 :   for (char c : name) {
      26         536 :     bool valid_char = (c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') ||
      27         559 :                       (c >= 'A' && c <= 'Z') || strchr(special_chars, c);
      28         483 :     if (!valid_char) return false;
      29             :   }
      30             :   return true;
      31             : }
      32             : 
      33             : }  // namespace
      34             : 
      35          89 : void PrintWasmText(const WasmModule* module, const ModuleWireBytes& wire_bytes,
      36             :                    uint32_t func_index, std::ostream& os,
      37             :                    debug::WasmDisassembly::OffsetTable* offset_table) {
      38             :   DCHECK_NOT_NULL(module);
      39             :   DCHECK_GT(module->functions.size(), func_index);
      40          89 :   const WasmFunction *fun = &module->functions[func_index];
      41             : 
      42          89 :   AccountingAllocator allocator;
      43         178 :   Zone zone(&allocator, ZONE_NAME);
      44          89 :   int line_nr = 0;
      45             :   int control_depth = 1;
      46             : 
      47             :   // Print the function signature.
      48          89 :   os << "func";
      49          89 :   WasmName fun_name = wire_bytes.GetNameOrNull(fun);
      50          89 :   if (IsValidFunctionName(fun_name)) {
      51          83 :     os << " $";
      52          83 :     os.write(fun_name.start(), fun_name.length());
      53             :   }
      54         184 :   if (fun->sig->parameter_count()) {
      55          21 :     os << " (param";
      56          63 :     for (auto param : fun->sig->parameters())
      57          42 :       os << ' ' << WasmOpcodes::TypeName(param);
      58             :     os << ')';
      59             :   }
      60         178 :   if (fun->sig->return_count()) {
      61           6 :     os << " (result";
      62          18 :     for (auto ret : fun->sig->returns())
      63          12 :       os << ' ' << WasmOpcodes::TypeName(ret);
      64             :     os << ')';
      65             :   }
      66          89 :   os << "\n";
      67          89 :   ++line_nr;
      68             : 
      69             :   // Print the local declarations.
      70             :   BodyLocalDecls decls(&zone);
      71             :   Vector<const byte> func_bytes = wire_bytes.GetFunctionBytes(fun);
      72          89 :   BytecodeIterator i(func_bytes.begin(), func_bytes.end(), &decls);
      73             :   DCHECK_LT(func_bytes.begin(), i.pc());
      74          89 :   if (!decls.type_list.empty()) {
      75          10 :     os << "(local";
      76          35 :     for (const ValueType &v : decls.type_list) {
      77          30 :       os << ' ' << WasmOpcodes::TypeName(v);
      78             :     }
      79          10 :     os << ")\n";
      80          10 :     ++line_nr;
      81             :   }
      82             : 
      83         386 :   for (; i.has_next(); i.next()) {
      84             :     WasmOpcode opcode = i.current();
      85         386 :     if (opcode == kExprElse || opcode == kExprEnd) --control_depth;
      86             : 
      87             :     DCHECK_LE(0, control_depth);
      88         386 :     const int kMaxIndentation = 64;
      89         772 :     int indentation = std::min(kMaxIndentation, 2 * control_depth);
      90         386 :     if (offset_table) {
      91         386 :       offset_table->emplace_back(i.pc_offset(), line_nr, indentation);
      92             :     }
      93             : 
      94             :     // 64 whitespaces
      95             :     const char padding[kMaxIndentation + 1] =
      96         386 :         "                                                                ";
      97         386 :     os.write(padding, indentation);
      98             : 
      99         386 :     switch (opcode) {
     100             :       case kExprLoop:
     101             :       case kExprIf:
     102             :       case kExprBlock:
     103             :       case kExprTry: {
     104          35 :         BlockTypeOperand<Decoder::kNoValidate> operand(&i, i.pc());
     105          35 :         os << WasmOpcodes::OpcodeName(opcode);
     106          35 :         if (operand.type == kWasmVar) {
     107           0 :           os << " (type " << operand.sig_index << ")";
     108          35 :         } else if (operand.out_arity() > 0) {
     109           0 :           os << " " << WasmOpcodes::TypeName(operand.out_type(0));
     110             :         }
     111          35 :         control_depth++;
     112             :         break;
     113             :       }
     114             :       case kExprBr:
     115             :       case kExprBrIf: {
     116           5 :         BreakDepthOperand<Decoder::kNoValidate> operand(&i, i.pc());
     117           5 :         os << WasmOpcodes::OpcodeName(opcode) << ' ' << operand.depth;
     118             :         break;
     119             :       }
     120             :       case kExprElse:
     121           0 :         os << "else";
     122           0 :         control_depth++;
     123           0 :         break;
     124             :       case kExprEnd:
     125         124 :         os << "end";
     126         124 :         break;
     127             :       case kExprBrTable: {
     128           0 :         BranchTableOperand<Decoder::kNoValidate> operand(&i, i.pc());
     129             :         BranchTableIterator<Decoder::kNoValidate> iterator(&i, operand);
     130           0 :         os << "br_table";
     131           0 :         while (iterator.has_next()) os << ' ' << iterator.next();
     132             :         break;
     133             :       }
     134             :       case kExprCallIndirect: {
     135           5 :         CallIndirectOperand<Decoder::kNoValidate> operand(&i, i.pc());
     136             :         DCHECK_EQ(0, operand.table_index);
     137           5 :         os << "call_indirect " << operand.index;
     138             :         break;
     139             :       }
     140             :       case kExprCallFunction: {
     141          48 :         CallFunctionOperand<Decoder::kNoValidate> operand(&i, i.pc());
     142          48 :         os << "call " << operand.index;
     143             :         break;
     144             :       }
     145             :       case kExprGetLocal:
     146             :       case kExprSetLocal:
     147             :       case kExprTeeLocal: {
     148          46 :         LocalIndexOperand<Decoder::kNoValidate> operand(&i, i.pc());
     149          46 :         os << WasmOpcodes::OpcodeName(opcode) << ' ' << operand.index;
     150             :         break;
     151             :       }
     152             :       case kExprThrow:
     153             :       case kExprCatch: {
     154           0 :         ExceptionIndexOperand<Decoder::kNoValidate> operand(&i, i.pc());
     155           0 :         os << WasmOpcodes::OpcodeName(opcode) << ' ' << operand.index;
     156             :         break;
     157             :       }
     158             :       case kExprGetGlobal:
     159             :       case kExprSetGlobal: {
     160           0 :         GlobalIndexOperand<Decoder::kNoValidate> operand(&i, i.pc());
     161           0 :         os << WasmOpcodes::OpcodeName(opcode) << ' ' << operand.index;
     162             :         break;
     163             :       }
     164             : #define CASE_CONST(type, str, cast_type)                           \
     165             :   case kExpr##type##Const: {                                       \
     166             :     Imm##type##Operand<Decoder::kNoValidate> operand(&i, i.pc());  \
     167             :     os << #str ".const " << static_cast<cast_type>(operand.value); \
     168             :     break;                                                         \
     169             :   }
     170         104 :         CASE_CONST(I32, i32, int32_t)
     171           0 :         CASE_CONST(I64, i64, int64_t)
     172           0 :         CASE_CONST(F32, f32, float)
     173           0 :         CASE_CONST(F64, f64, double)
     174             : #undef CASE_CONST
     175             : 
     176             : #define CASE_OPCODE(opcode, _, __) case kExpr##opcode:
     177             :         FOREACH_LOAD_MEM_OPCODE(CASE_OPCODE)
     178             :         FOREACH_STORE_MEM_OPCODE(CASE_OPCODE) {
     179             :           MemoryAccessOperand<Decoder::kNoValidate> operand(&i, i.pc(),
     180           0 :                                                             kMaxUInt32);
     181           0 :           os << WasmOpcodes::OpcodeName(opcode) << " offset=" << operand.offset
     182           0 :              << " align=" << (1ULL << operand.alignment);
     183             :           break;
     184             :         }
     185             : 
     186             :         FOREACH_SIMPLE_OPCODE(CASE_OPCODE)
     187             :       case kExprUnreachable:
     188             :       case kExprNop:
     189             :       case kExprReturn:
     190             :       case kExprMemorySize:
     191             :       case kExprGrowMemory:
     192             :       case kExprDrop:
     193             :       case kExprSelect:
     194          59 :         os << WasmOpcodes::OpcodeName(opcode);
     195          59 :         break;
     196             :       case kAtomicPrefix: {
     197          12 :         WasmOpcode atomic_opcode = i.prefixed_opcode();
     198             :         switch (atomic_opcode) {
     199             :           FOREACH_ATOMIC_OPCODE(CASE_OPCODE) {
     200             :             MemoryAccessOperand<Decoder::kNoValidate> operand(&i, i.pc(),
     201          12 :                                                               kMaxUInt32);
     202          12 :             os << WasmOpcodes::OpcodeName(atomic_opcode)
     203          24 :                << " offset=" << operand.offset
     204          24 :                << " align=" << (1ULL << operand.alignment);
     205             :             break;
     206             :           }
     207             :           default:
     208           0 :             UNREACHABLE();
     209             :             break;
     210             :         }
     211             :       }
     212             : 
     213             :         // This group is just printed by their internal opcode name, as they
     214             :         // should never be shown to end-users.
     215             :         FOREACH_ASMJS_COMPAT_OPCODE(CASE_OPCODE)
     216             :         // TODO(wasm): Add correct printing for SIMD and atomic opcodes once
     217             :         // they are publicly available.
     218             :         FOREACH_SIMD_0_OPERAND_OPCODE(CASE_OPCODE)
     219             :         FOREACH_SIMD_1_OPERAND_OPCODE(CASE_OPCODE)
     220             :         FOREACH_SIMD_MASK_OPERAND_OPCODE(CASE_OPCODE)
     221             :         FOREACH_SIMD_MEM_OPCODE(CASE_OPCODE)
     222          12 :         os << WasmOpcodes::OpcodeName(opcode);
     223          12 :         break;
     224             : #undef CASE_OPCODE
     225             : 
     226             :       default:
     227           0 :         UNREACHABLE();
     228             :         break;
     229             :     }
     230             :     os << '\n';
     231         386 :     ++line_nr;
     232             :   }
     233             :   DCHECK_EQ(0, control_depth);
     234          89 :   DCHECK(i.ok());
     235          89 : }
     236             : 
     237             : }  // namespace wasm
     238             : }  // namespace internal
     239             : }  // namespace v8

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