/src/WasmEdge/lib/loader/ast/segment.cpp

Source
// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: 2019-2024 Second State INC

#include "loader/loader.h"

namespace WasmEdge {
namespace Loader {

// Load binary of TableSegment node. See "include/loader/loader.h".
Expect<void> Loader::loadSegment(AST::TableSegment &TabSeg) {
  // Check the first byte is the reftype in table type or not.
  EXPECTED_TRY(uint8_t CheckByte, FMgr.peekByte().map_error([this](auto E) {
    return logLoadError(E, FMgr.getLastOffset(), ASTNodeAttr::Seg_Table);
  }));

  if (CheckByte == 0x40U) {
    // Table segment case is for FunctionReferences proposal.
    if (!Conf.hasProposal(Proposal::FunctionReferences)) {
      return logNeedProposal(ErrCode::Value::MalformedTable,
                             Proposal::FunctionReferences, FMgr.getLastOffset(),
                             ASTNodeAttr::Seg_Table);
    }
    FMgr.readByte();

    // Check the second byte.
    EXPECTED_TRY(uint8_t B, FMgr.readByte().map_error([this](auto E) {
      return logLoadError(E, FMgr.getLastOffset(), ASTNodeAttr::Seg_Table);
    }));
    if (B != 0x00U) {
      return logLoadError(ErrCode::Value::MalformedTable, FMgr.getLastOffset(),
                          ASTNodeAttr::Seg_Table);
    }

    // Read the table type.
    EXPECTED_TRY(loadType(TabSeg.getTableType()).map_error([](auto E) {
      spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Table));
      return E;
    }));

    // Read the expression.
    EXPECTED_TRY(loadExpression(TabSeg.getExpr()).map_error([](auto E) {
      spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Table));
      return E;
    }));
  } else {
    // The table type case.
    EXPECTED_TRY(loadType(TabSeg.getTableType()).map_error([](auto E) {
      spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Table));
      return E;
    }));
  }

  return {};
}

// Load binary of GlobalSegment node. See "include/loader/loader.h".
Expect<void> Loader::loadSegment(AST::GlobalSegment &GlobSeg) {
  return Expect<void>{}
      .and_then([this, &GlobSeg]() {
        // Read global type node.
        return loadType(GlobSeg.getGlobalType());
      })
      .and_then([this, &GlobSeg]() {
        // Read the expression.
        return loadExpression(GlobSeg.getExpr());
      })
      .map_error([](auto E) {
        spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Global));
        return E;
      });
}

// Load binary of ElementSegment node. See "include/loader/loader.h".
Expect<void> Loader::loadSegment(AST::ElementSegment &ElemSeg) {
  auto ReportError = [this](auto E) {
    return logLoadError(E, FMgr.getLastOffset(), ASTNodeAttr::Seg_Element);
  };

  // Element segment binary format:
  // ---------------------------------------------------------------------------
  //  Mode | TableIdx | OffExpr | ElemKind | RefType | vec(FuncIdx) | vec(expr)
  // ------|----------|---------|----------|---------|--------------|-----------
  //    0  |          |    v    |          |         |       v      |
  //    1  |          |         |    v     |         |       v      |
  //    2  |    v     |    v    |    v     |         |       v      |
  //    3  |          |         |    v     |         |       v      |
  //    4  |          |    v    |          |         |              |     v
  //    5  |          |         |          |    v    |              |     v
  //    6  |    v     |    v    |          |    v    |              |     v
  //    7  |          |         |          |    v    |              |     v
  // ---------------------------------------------------------------------------
  // Mode: element initial integer, u32
  // TableIdx: target table index, u32
  // OffExpr: init offset expression, expr
  // ElemKind: byte 0x00, ref.func
  // RefType: reference type, RefType
  // vec(FuncIdx): function index vector, vec(u32)
  // vec(expr): reference init list, vec(expr)

  // Read the checking byte.
  uint32_t Check = 0;
  if (unlikely(!Conf.hasProposal(Proposal::BulkMemoryOperations) &&
               !Conf.hasProposal(Proposal::ReferenceTypes))) {
    // Legacy for BulkMemoryOperations and ReferenceTypes proposals turned off.
    // Element segment binary format: TableIdx + OffExpr + vec(FuncIdx)
    EXPECTED_TRY(FMgr.readU32().map_error(ReportError).map([&](auto Idx) {
      ElemSeg.setIdx(Idx);
    }));
  } else {
    EXPECTED_TRY(Check, FMgr.readU32().map_error(ReportError));
  }

  // Check the prefix byte.
  switch (Check) {
  case 0x00:
  case 0x02:
  case 0x04:
  case 0x06:
    ElemSeg.setMode(AST::ElementSegment::ElemMode::Active);
    break;

  case 0x01:
  case 0x05:
    ElemSeg.setMode(AST::ElementSegment::ElemMode::Passive);
    break;

  case 0x03:
  case 0x07:
    ElemSeg.setMode(AST::ElementSegment::ElemMode::Declarative);
    break;

  default:
    // TODO: Correctness the error code once there's spec test.
    return logLoadError(ErrCode::Value::IllegalGrammar, FMgr.getLastOffset(),
                        ASTNodeAttr::Seg_Element);
  }

  // Read the table index.
  ElemSeg.setIdx(0);
  switch (Check) {
  case 0x02:
  case 0x06:
    EXPECTED_TRY(FMgr.readU32().map_error(ReportError).map([&](auto Idx) {
      ElemSeg.setIdx(Idx);
    }));
    break;

  default:
    break;
  }

  // Read the expression.
  switch (Check) {
  case 0x00:
  case 0x02:
  case 0x04:
  case 0x06:
    EXPECTED_TRY(loadExpression(ElemSeg.getExpr()).map_error([](auto E) {
      spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Element));
      return E;
    }));
    break;

  default:
    break;
  }

  // Read element kind and init function indices.
  switch (Check) {
  case 0x01:
  case 0x02:
  case 0x03:
    EXPECTED_TRY(FMgr.readByte()
                     .and_then([&](auto B) -> Expect<void> {
                       if (B != 0x00U) {
                         return Unexpect(ErrCode::Value::ExpectedZeroByte);
                       };
                       return {};
                     })
                     .map_error(ReportError));
    [[fallthrough]];

  case 0x00: {
    EXPECTED_TRY(uint32_t VecCnt, loadVecCnt().map_error(ReportError));
    for (uint32_t I = 0; I < VecCnt; ++I) {
      // For each element in vec(funcidx), make expr(ref.func idx end).
      ElemSeg.getInitExprs().emplace_back();
      AST::Instruction RefFunc(OpCode::Ref__func);
      AST::Instruction End(OpCode::End);
      EXPECTED_TRY(loadInstruction(RefFunc).map_error([](auto E) {
        spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Element));
        return E;
      }));
      ElemSeg.getInitExprs().back().getInstrs().emplace_back(
          std::move(RefFunc));
      ElemSeg.getInitExprs().back().getInstrs().emplace_back(std::move(End));
    }
    break;
  }
  default:
    break;
  }

  // Set the default reference type.
  if (Check == 0x04) {
    ElemSeg.setRefType(TypeCode::FuncRef);
  } else {
    ElemSeg.setRefType(ValType(TypeCode::Ref, TypeCode::FuncRef));
  }

  // Read the reference type and init expressions.
  switch (Check) {
  case 0x05:
  case 0x06:
  case 0x07: {
    // The AST node information is handled.
    EXPECTED_TRY(auto Type, loadRefType(ASTNodeAttr::Seg_Element));
    ElemSeg.setRefType(Type);
    [[fallthrough]];
  }
  case 0x04: {
    return loadVec<AST::ElementSegment>(
        ElemSeg.getInitExprs(), [this](AST::Expression &Expr) -> Expect<void> {
          return loadExpression(Expr);
        });
  }

  default:
    break;
  }

  return {};
}

// Load binary of CodeSegment node. See "include/loader/loader.h".
Expect<void> Loader::loadSegment(AST::CodeSegment &CodeSeg) {
  auto ReportError = [this](auto E) {
    return logLoadError(E, FMgr.getLastOffset(), ASTNodeAttr::Seg_Code);
  };

  // Read the code segment size.
  EXPECTED_TRY(FMgr.readU32().map_error(ReportError).map([&](auto S) {
    CodeSeg.setSegSize(S);
  }));
  auto ExprSizeBound = FMgr.getOffset() + CodeSeg.getSegSize();

  // Read the vector of local variable counts and types.
  EXPECTED_TRY(uint32_t VecCnt, loadVecCnt().map_error(ReportError));
  CodeSeg.getLocals().clear();
  CodeSeg.getLocals().reserve(VecCnt);
  uint32_t TotalLocalCnt = 0;
  for (uint32_t I = 0; I < VecCnt; ++I) {
    EXPECTED_TRY(uint32_t LocalCnt, FMgr.readU32().map_error(ReportError));
    // Total local variables should not more than 2^32. Capped at 2^26.
    if (UINT32_C(67108864) - TotalLocalCnt < LocalCnt) {
      return logLoadError(ErrCode::Value::TooManyLocals, FMgr.getLastOffset(),
                          ASTNodeAttr::Seg_Code);
    }
    TotalLocalCnt += LocalCnt;
    // Read the value type.
    // The AST node information is handled.
    EXPECTED_TRY(ValType LocalType, loadValType(ASTNodeAttr::Seg_Code));
    CodeSeg.getLocals().push_back(std::make_pair(LocalCnt, LocalType));
  }

  if (!Conf.getRuntimeConfigure().isForceInterpreter() &&
      WASMType != InputType::WASM) {
    // For the AOT mode and not force interpreter in configure, skip the
    // function body.
    FMgr.seek(ExprSizeBound);
  } else {
    // Read function body with expected expression size.
    EXPECTED_TRY(
        loadExpression(CodeSeg.getExpr(), ExprSizeBound).map_error([](auto E) {
          spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Code));
          return E;
        }));
  }

  return {};
}

// Load binary of DataSegment node. See "include/loader/loader.h".
Expect<void> Loader::loadSegment(AST::DataSegment &DataSeg) {
  auto ReportError = [this](auto E) {
    return logLoadError(E, FMgr.getLastOffset(), ASTNodeAttr::Seg_Data);
  };
  DataSeg.setMode(AST::DataSegment::DataMode::Passive);
  DataSeg.setIdx(0);

  // Data segment binary format:
  // ----------------------------------------
  //  Mode | MemoryIdx | OffExpr | vec(byte)
  // ------|-----------|---------|-----------
  //    0  |           |    v    |     v
  //    1  |           |         |     v
  //    2  |     v     |    v    |     v
  // ----------------------------------------
  // Mode: data initial integer, u32
  // MemoryIdx: target memory index, u32
  // OffExpr: init offset expression, expr
  // vec(byte): init data, vec(u8)

  // Read the checking byte.
  EXPECTED_TRY(uint32_t Check, FMgr.readU32().map_error(ReportError));
  // Check > 0 cases are for BulkMemoryOperations or ReferenceTypes proposal.
  if (Check > 0 && !Conf.hasProposal(Proposal::BulkMemoryOperations) &&
      !Conf.hasProposal(Proposal::ReferenceTypes)) {
    return logNeedProposal(ErrCode::Value::ExpectedZeroByte,
                           Proposal::BulkMemoryOperations, FMgr.getLastOffset(),
                           ASTNodeAttr::Seg_Data);
  }

  switch (Check) {
  case 0x02: // 0x02 memidx expr vec(byte) , Active
    // Read target memory index.
    EXPECTED_TRY(FMgr.readU32().map_error(ReportError).map([&](auto Idx) {
      DataSeg.setIdx(Idx);
    }));
    [[fallthrough]];

  case 0x00: // 0x00 expr vec(byte) , Active
    // Read the offset expression.
    EXPECTED_TRY(loadExpression(DataSeg.getExpr()).map_error([](auto E) {
      spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Data));
      return E;
    }));
    DataSeg.setMode(AST::DataSegment::DataMode::Active);
    [[fallthrough]];

  case 0x01: // 0x01 vec(byte) , Passive
  {
    // Read initialization data.
    EXPECTED_TRY(uint32_t VecCnt, loadVecCnt().map_error(ReportError));
    EXPECTED_TRY(FMgr.readBytes(VecCnt).map_error(ReportError).map([&](auto V) {
      DataSeg.getData() = std::move(V);
    }));
    break;
  }
  default:
    // TODO: Correctness the error code once there's spec test.
    return logLoadError(ErrCode::Value::IllegalGrammar, FMgr.getLastOffset(),
                        ASTNodeAttr::Seg_Data);
  }
  return {};
}

} // namespace Loader
} // namespace WasmEdge

Coverage Report

Created: 2025-12-31 06:34

Line	Count	Source
1		// SPDX-License-Identifier: Apache-2.0
2		// SPDX-FileCopyrightText: 2019-2024 Second State INC
3
4		#include "loader/loader.h"
5
6		namespace WasmEdge {
7		namespace Loader {
8
9		// Load binary of TableSegment node. See "include/loader/loader.h".
10	1.76k	Expect<void> Loader::loadSegment(AST::TableSegment &TabSeg) {
11		// Check the first byte is the reftype in table type or not.
12	1.76k	EXPECTED_TRY(uint8_t CheckByte, FMgr.peekByte().map_error([this](auto E) {
13	1.75k	return logLoadError(E, FMgr.getLastOffset(), ASTNodeAttr::Seg_Table);
14	1.75k	}));
15
16	1.75k	if (CheckByte == 0x40U) {
17		// Table segment case is for FunctionReferences proposal.
18	42	if (!Conf.hasProposal(Proposal::FunctionReferences)) {
19	0	return logNeedProposal(ErrCode::Value::MalformedTable,
20	0	Proposal::FunctionReferences, FMgr.getLastOffset(),
21	0	ASTNodeAttr::Seg_Table);
22	0	}
23	42	FMgr.readByte();
24
25		// Check the second byte.
26	42	EXPECTED_TRY(uint8_t B, FMgr.readByte().map_error([this](auto E) {
27	41	return logLoadError(E, FMgr.getLastOffset(), ASTNodeAttr::Seg_Table);
28	41	}));
29	41	if (B != 0x00U) {
30	9	return logLoadError(ErrCode::Value::MalformedTable, FMgr.getLastOffset(),
31	9	ASTNodeAttr::Seg_Table);
32	9	}
33
34		// Read the table type.
35	32	EXPECTED_TRY(loadType(TabSeg.getTableType()).map_error([](auto E) {
36	29	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Table));
37	29	return E;
38	29	}));
39
40		// Read the expression.
41	29	EXPECTED_TRY(loadExpression(TabSeg.getExpr()).map_error([](auto E) {
42	29	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Table));
43	29	return E;
44	29	}));
45	1.71k	} else {
46		// The table type case.
47	1.71k	EXPECTED_TRY(loadType(TabSeg.getTableType()).map_error([](auto E) {
48	1.71k	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Table));
49	1.71k	return E;
50	1.71k	}));
51	1.71k	}
52
53	1.70k	return {};
54	1.75k	}
55
56		// Load binary of GlobalSegment node. See "include/loader/loader.h".
57	1.08k	Expect<void> Loader::loadSegment(AST::GlobalSegment &GlobSeg) {
58	1.08k	return Expect<void>{}
59	1.08k	.and_then([this, &GlobSeg]() {
60		// Read global type node.
61	1.08k	return loadType(GlobSeg.getGlobalType());
62	1.08k	})
63	1.08k	.and_then([this, &GlobSeg]() {
64		// Read the expression.
65	1.05k	return loadExpression(GlobSeg.getExpr());
66	1.05k	})
67	1.08k	.map_error([](auto E) {
68	298	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Global));
69	298	return E;
70	298	});
71	1.08k	}
72
73		// Load binary of ElementSegment node. See "include/loader/loader.h".
74	9.89k	Expect<void> Loader::loadSegment(AST::ElementSegment &ElemSeg) {
75	9.89k	auto ReportError = [this](auto E) {
76	64	return logLoadError(E, FMgr.getLastOffset(), ASTNodeAttr::Seg_Element);
77	64	};
78
79		// Element segment binary format:
80		// ---------------------------------------------------------------------------
81		// Mode \| TableIdx \| OffExpr \| ElemKind \| RefType \| vec(FuncIdx) \| vec(expr)
82		// ------\|----------\|---------\|----------\|---------\|--------------\|-----------
83		// 0 \| \| v \| \| \| v \|
84		// 1 \| \| \| v \| \| v \|
85		// 2 \| v \| v \| v \| \| v \|
86		// 3 \| \| \| v \| \| v \|
87		// 4 \| \| v \| \| \| \| v
88		// 5 \| \| \| \| v \| \| v
89		// 6 \| v \| v \| \| v \| \| v
90		// 7 \| \| \| \| v \| \| v
91		// ---------------------------------------------------------------------------
92		// Mode: element initial integer, u32
93		// TableIdx: target table index, u32
94		// OffExpr: init offset expression, expr
95		// ElemKind: byte 0x00, ref.func
96		// RefType: reference type, RefType
97		// vec(FuncIdx): function index vector, vec(u32)
98		// vec(expr): reference init list, vec(expr)
99
100		// Read the checking byte.
101	9.89k	uint32_t Check = 0;
102	9.89k	if (unlikely(!Conf.hasProposal(Proposal::BulkMemoryOperations) &&
103	0	!Conf.hasProposal(Proposal::ReferenceTypes))) {
104		// Legacy for BulkMemoryOperations and ReferenceTypes proposals turned off.
105		// Element segment binary format: TableIdx + OffExpr + vec(FuncIdx)
106	0	EXPECTED_TRY(FMgr.readU32().map_error(ReportError).map([&](auto Idx) {
107	0	ElemSeg.setIdx(Idx);
108	0	}));
109	9.89k	} else {
110	9.89k	EXPECTED_TRY(Check, FMgr.readU32().map_error(ReportError));
111	9.87k	}
112
113		// Check the prefix byte.
114	9.87k	switch (Check) {
115	4.47k	case 0x00:
116	6.72k	case 0x02:
117	8.61k	case 0x04:
118	8.79k	case 0x06:
119	8.79k	ElemSeg.setMode(AST::ElementSegment::ElemMode::Active);
120	8.79k	break;
121
122	583	case 0x01:
123	674	case 0x05:
124	674	ElemSeg.setMode(AST::ElementSegment::ElemMode::Passive);
125	674	break;
126
127	236	case 0x03:
128	370	case 0x07:
129	370	ElemSeg.setMode(AST::ElementSegment::ElemMode::Declarative);
130	370	break;
131
132	41	default:
133		// TODO: Correctness the error code once there's spec test.
134	41	return logLoadError(ErrCode::Value::IllegalGrammar, FMgr.getLastOffset(),
135	41	ASTNodeAttr::Seg_Element);
136	9.87k	}
137
138		// Read the table index.
139	9.83k	ElemSeg.setIdx(0);
140	9.83k	switch (Check) {
141	2.25k	case 0x02:
142	2.43k	case 0x06:
143	2.43k	EXPECTED_TRY(FMgr.readU32().map_error(ReportError).map([&](auto Idx) {
144	2.43k	ElemSeg.setIdx(Idx);
145	2.43k	}));
146	2.43k	break;
147
148	7.40k	default:
149	7.40k	break;
150	9.83k	}
151
152		// Read the expression.
153	9.83k	switch (Check) {
154	4.47k	case 0x00:
155	6.72k	case 0x02:
156	8.60k	case 0x04:
157	8.79k	case 0x06:
158	8.79k	EXPECTED_TRY(loadExpression(ElemSeg.getExpr()).map_error([](auto E) {
159	7.95k	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Element));
160	7.95k	return E;
161	7.95k	}));
162	7.95k	break;
163
164	7.95k	default:
165	1.04k	break;
166	9.83k	}
167
168		// Read element kind and init function indices.
169	8.99k	switch (Check) {
170	583	case 0x01:
171	2.81k	case 0x02:
172	3.05k	case 0x03:
173	3.05k	EXPECTED_TRY(FMgr.readByte()
174	3.04k	.and_then([&](auto B) -> Expect<void> {
175	3.04k	if (B != 0x00U) {
176	3.04k	return Unexpect(ErrCode::Value::ExpectedZeroByte);
177	3.04k	};
178	3.04k	return {};
179	3.04k	})
180	3.04k	.map_error(ReportError));
181	3.04k	[[fallthrough]];
182
183	6.95k	case 0x00: {
184	6.95k	EXPECTED_TRY(uint32_t VecCnt, loadVecCnt().map_error(ReportError));
185	17.0k	for (uint32_t I = 0; I < VecCnt; ++I) {
186		// For each element in vec(funcidx), make expr(ref.func idx end).
187	10.1k	ElemSeg.getInitExprs().emplace_back();
188	10.1k	AST::Instruction RefFunc(OpCode::Ref__func);
189	10.1k	AST::Instruction End(OpCode::End);
190	10.1k	EXPECTED_TRY(loadInstruction(RefFunc).map_error([](auto E) {
191	10.1k	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Element));
192	10.1k	return E;
193	10.1k	}));
194	10.1k	ElemSeg.getInitExprs().back().getInstrs().emplace_back(
195	10.1k	std::move(RefFunc));
196	10.1k	ElemSeg.getInitExprs().back().getInstrs().emplace_back(std::move(End));
197	10.1k	}
198	6.90k	break;
199	6.91k	}
200	6.90k	default:
201	2.03k	break;
202	8.99k	}
203
204		// Set the default reference type.
205	8.93k	if (Check == 0x04) {
206	1.66k	ElemSeg.setRefType(TypeCode::FuncRef);
207	7.27k	} else {
208	7.27k	ElemSeg.setRefType(ValType(TypeCode::Ref, TypeCode::FuncRef));
209	7.27k	}
210
211		// Read the reference type and init expressions.
212	8.93k	switch (Check) {
213	91	case 0x05:
214	236	case 0x06:
215	370	case 0x07: {
216		// The AST node information is handled.
217	370	EXPECTED_TRY(auto Type, loadRefType(ASTNodeAttr::Seg_Element));
218	366	ElemSeg.setRefType(Type);
219	366	[[fallthrough]];
220	366	}
221	2.03k	case 0x04: {
222	2.03k	return loadVec<AST::ElementSegment>(
223	4.60k	ElemSeg.getInitExprs(), [this](AST::Expression &Expr) -> Expect<void> {
224	4.60k	return loadExpression(Expr);
225	4.60k	});
226	366	}
227
228	6.90k	default:
229	6.90k	break;
230	8.93k	}
231
232	6.90k	return {};
233	8.93k	}
234
235		// Load binary of CodeSegment node. See "include/loader/loader.h".
236	20.7k	Expect<void> Loader::loadSegment(AST::CodeSegment &CodeSeg) {
237	20.7k	auto ReportError = [this](auto E) {
238	31	return logLoadError(E, FMgr.getLastOffset(), ASTNodeAttr::Seg_Code);
239	31	};
240
241		// Read the code segment size.
242	20.7k	EXPECTED_TRY(FMgr.readU32().map_error(ReportError).map([&](auto S) {
243	20.7k	CodeSeg.setSegSize(S);
244	20.7k	}));
245	20.7k	auto ExprSizeBound = FMgr.getOffset() + CodeSeg.getSegSize();
246
247		// Read the vector of local variable counts and types.
248	20.7k	EXPECTED_TRY(uint32_t VecCnt, loadVecCnt().map_error(ReportError));
249	20.7k	CodeSeg.getLocals().clear();
250	20.7k	CodeSeg.getLocals().reserve(VecCnt);
251	20.7k	uint32_t TotalLocalCnt = 0;
252	24.9k	for (uint32_t I = 0; I < VecCnt; ++I) {
253	4.25k	EXPECTED_TRY(uint32_t LocalCnt, FMgr.readU32().map_error(ReportError));
254		// Total local variables should not more than 2^32. Capped at 2^26.
255	4.24k	if (UINT32_C(67108864) - TotalLocalCnt < LocalCnt) {
256	7	return logLoadError(ErrCode::Value::TooManyLocals, FMgr.getLastOffset(),
257	7	ASTNodeAttr::Seg_Code);
258	7	}
259	4.23k	TotalLocalCnt += LocalCnt;
260		// Read the value type.
261		// The AST node information is handled.
262	4.23k	EXPECTED_TRY(ValType LocalType, loadValType(ASTNodeAttr::Seg_Code));
263	4.20k	CodeSeg.getLocals().push_back(std::make_pair(LocalCnt, LocalType));
264	4.20k	}
265
266	20.7k	if (!Conf.getRuntimeConfigure().isForceInterpreter() &&
267	0	WASMType != InputType::WASM) {
268		// For the AOT mode and not force interpreter in configure, skip the
269		// function body.
270	0	FMgr.seek(ExprSizeBound);
271	20.7k	} else {
272		// Read function body with expected expression size.
273	20.7k	EXPECTED_TRY(
274	20.7k	loadExpression(CodeSeg.getExpr(), ExprSizeBound).map_error([](auto E) {
275	20.7k	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Code));
276	20.7k	return E;
277	20.7k	}));
278	20.7k	}
279
280	19.7k	return {};
281	20.7k	}
282
283		// Load binary of DataSegment node. See "include/loader/loader.h".
284	4.47k	Expect<void> Loader::loadSegment(AST::DataSegment &DataSeg) {
285	4.47k	auto ReportError = [this](auto E) {
286	28	return logLoadError(E, FMgr.getLastOffset(), ASTNodeAttr::Seg_Data);
287	28	};
288	4.47k	DataSeg.setMode(AST::DataSegment::DataMode::Passive);
289	4.47k	DataSeg.setIdx(0);
290
291		// Data segment binary format:
292		// ----------------------------------------
293		// Mode \| MemoryIdx \| OffExpr \| vec(byte)
294		// ------\|-----------\|---------\|-----------
295		// 0 \| \| v \| v
296		// 1 \| \| \| v
297		// 2 \| v \| v \| v
298		// ----------------------------------------
299		// Mode: data initial integer, u32
300		// MemoryIdx: target memory index, u32
301		// OffExpr: init offset expression, expr
302		// vec(byte): init data, vec(u8)
303
304		// Read the checking byte.
305	4.47k	EXPECTED_TRY(uint32_t Check, FMgr.readU32().map_error(ReportError));
306		// Check > 0 cases are for BulkMemoryOperations or ReferenceTypes proposal.
307	4.46k	if (Check > 0 && !Conf.hasProposal(Proposal::BulkMemoryOperations) &&
308	0	!Conf.hasProposal(Proposal::ReferenceTypes)) {
309	0	return logNeedProposal(ErrCode::Value::ExpectedZeroByte,
310	0	Proposal::BulkMemoryOperations, FMgr.getLastOffset(),
311	0	ASTNodeAttr::Seg_Data);
312	0	}
313
314	4.46k	switch (Check) {
315	891	case 0x02: // 0x02 memidx expr vec(byte) , Active
316		// Read target memory index.
317	891	EXPECTED_TRY(FMgr.readU32().map_error(ReportError).map([&](auto Idx) {
318	890	DataSeg.setIdx(Idx);
319	890	}));
320	890	[[fallthrough]];
321
322	3.11k	case 0x00: // 0x00 expr vec(byte) , Active
323		// Read the offset expression.
324	3.11k	EXPECTED_TRY(loadExpression(DataSeg.getExpr()).map_error([](auto E) {
325	1.85k	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Data));
326	1.85k	return E;
327	1.85k	}));
328	1.85k	DataSeg.setMode(AST::DataSegment::DataMode::Active);
329	1.85k	[[fallthrough]];
330
331	3.17k	case 0x01: // 0x01 vec(byte) , Passive
332	3.17k	{
333		// Read initialization data.
334	3.17k	EXPECTED_TRY(uint32_t VecCnt, loadVecCnt().map_error(ReportError));
335	3.16k	EXPECTED_TRY(FMgr.readBytes(VecCnt).map_error(ReportError).map([&](auto V) {
336	3.15k	DataSeg.getData() = std::move(V);
337	3.15k	}));
338	3.15k	break;
339	3.16k	}
340	3.15k	default:
341		// TODO: Correctness the error code once there's spec test.
342	31	return logLoadError(ErrCode::Value::IllegalGrammar, FMgr.getLastOffset(),
343	31	ASTNodeAttr::Seg_Data);
344	4.46k	}
345	3.15k	return {};
346	4.46k	}
347
348		} // namespace Loader
349		} // namespace WasmEdge