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

Source
// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: Copyright The WasmEdge Authors

#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 whether the first byte is the reftype in table type.
  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: Correct 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 exceed 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().getRunMode() == RunMode::AOT &&
      WASMType != InputType::WASM) {
    // In AOT run mode with an AOT artifact, skip parsing 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: Correct 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: 2026-07-16 07:09

Line	Count	Source
1		// SPDX-License-Identifier: Apache-2.0
2		// SPDX-FileCopyrightText: Copyright The WasmEdge Authors
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	2.57k	Expect<void> Loader::loadSegment(AST::TableSegment &TabSeg) {
11		// Check whether the first byte is the reftype in table type.
12	2.57k	EXPECTED_TRY(uint8_t CheckByte, FMgr.peekByte().map_error([this](auto E) {
13	2.55k	return logLoadError(E, FMgr.getLastOffset(), ASTNodeAttr::Seg_Table);
14	2.55k	}));
15
16	2.55k	if (CheckByte == 0x40U) {
17		// Table segment case is for FunctionReferences proposal.
18	319	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	319	FMgr.readByte();
24
25		// Check the second byte.
26	319	EXPECTED_TRY(uint8_t B, FMgr.readByte().map_error([this](auto E) {
27	313	return logLoadError(E, FMgr.getLastOffset(), ASTNodeAttr::Seg_Table);
28	313	}));
29	313	if (B != 0x00U) {
30	10	return logLoadError(ErrCode::Value::MalformedTable, FMgr.getLastOffset(),
31	10	ASTNodeAttr::Seg_Table);
32	10	}
33
34		// Read the table type.
35	303	EXPECTED_TRY(loadType(TabSeg.getTableType()).map_error([](auto E) {
36	294	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Table));
37	294	return E;
38	294	}));
39
40		// Read the expression.
41	294	EXPECTED_TRY(loadExpression(TabSeg.getExpr()).map_error([](auto E) {
42	294	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Table));
43	294	return E;
44	294	}));
45	2.23k	} else {
46		// The table type case.
47	2.23k	EXPECTED_TRY(loadType(TabSeg.getTableType()).map_error([](auto E) {
48	2.23k	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Table));
49	2.23k	return E;
50	2.23k	}));
51	2.23k	}
52
53	2.31k	return {};
54	2.55k	}
55
56		// Load binary of GlobalSegment node. See "include/loader/loader.h".
57	3.01k	Expect<void> Loader::loadSegment(AST::GlobalSegment &GlobSeg) {
58	3.01k	return Expect<void>{}
59	3.01k	.and_then([this, &GlobSeg]() {
60		// Read global type node.
61	3.01k	return loadType(GlobSeg.getGlobalType());
62	3.01k	})
63	3.01k	.and_then([this, &GlobSeg]() {
64		// Read the expression.
65	2.88k	return loadExpression(GlobSeg.getExpr());
66	2.88k	})
67	3.01k	.map_error([](auto E) {
68	1.54k	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Global));
69	1.54k	return E;
70	1.54k	});
71	3.01k	}
72
73		// Load binary of ElementSegment node. See "include/loader/loader.h".
74	11.5k	Expect<void> Loader::loadSegment(AST::ElementSegment &ElemSeg) {
75	11.5k	auto ReportError = [this](auto E) {
76	163	return logLoadError(E, FMgr.getLastOffset(), ASTNodeAttr::Seg_Element);
77	163	};
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	11.5k	uint32_t Check = 0;
102	11.5k	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	11.5k	} else {
110	11.5k	EXPECTED_TRY(Check, FMgr.readU32().map_error(ReportError));
111	11.5k	}
112
113		// Check the prefix byte.
114	11.5k	switch (Check) {
115	5.91k	case 0x00:
116	7.90k	case 0x02:
117	9.63k	case 0x04:
118	9.95k	case 0x06:
119	9.95k	ElemSeg.setMode(AST::ElementSegment::ElemMode::Active);
120	9.95k	break;
121
122	676	case 0x01:
123	895	case 0x05:
124	895	ElemSeg.setMode(AST::ElementSegment::ElemMode::Passive);
125	895	break;
126
127	309	case 0x03:
128	559	case 0x07:
129	559	ElemSeg.setMode(AST::ElementSegment::ElemMode::Declarative);
130	559	break;
131
132	109	default:
133		// TODO: Correct the error code once there's spec test.
134	109	return logLoadError(ErrCode::Value::IllegalGrammar, FMgr.getLastOffset(),
135	109	ASTNodeAttr::Seg_Element);
136	11.5k	}
137
138		// Read the table index.
139	11.4k	ElemSeg.setIdx(0);
140	11.4k	switch (Check) {
141	1.98k	case 0x02:
142	2.30k	case 0x06:
143	2.30k	EXPECTED_TRY(FMgr.readU32().map_error(ReportError).map([&](auto Idx) {
144	2.29k	ElemSeg.setIdx(Idx);
145	2.29k	}));
146	2.29k	break;
147
148	9.10k	default:
149	9.10k	break;
150	11.4k	}
151
152		// Read the expression.
153	11.4k	switch (Check) {
154	5.91k	case 0x00:
155	7.89k	case 0x02:
156	9.63k	case 0x04:
157	9.94k	case 0x06:
158	9.94k	EXPECTED_TRY(loadExpression(ElemSeg.getExpr()).map_error([](auto E) {
159	6.94k	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Element));
160	6.94k	return E;
161	6.94k	}));
162	6.94k	break;
163
164	6.94k	default:
165	1.45k	break;
166	11.4k	}
167
168		// Read element kind and init function indices.
169	8.40k	switch (Check) {
170	676	case 0x01:
171	2.56k	case 0x02:
172	2.86k	case 0x03:
173	2.86k	EXPECTED_TRY(FMgr.readByte()
174	2.83k	.and_then([&](auto B) -> Expect<void> {
175	2.83k	if (B != 0x00U) {
176	2.83k	return Unexpect(ErrCode::Value::ExpectedZeroByte);
177	2.83k	};
178	2.83k	return {};
179	2.83k	})
180	2.83k	.map_error(ReportError));
181	2.83k	[[fallthrough]];
182
183	6.25k	case 0x00: {
184	6.25k	EXPECTED_TRY(uint32_t VecCnt, loadVecCnt().map_error(ReportError));
185	483k	for (uint32_t I = 0; I < VecCnt; ++I) {
186		// For each element in vec(funcidx), make expr(ref.func idx end).
187	477k	ElemSeg.getInitExprs().emplace_back();
188	477k	AST::Instruction RefFunc(OpCode::Ref__func);
189	477k	AST::Instruction End(OpCode::End);
190	477k	EXPECTED_TRY(loadInstruction(RefFunc).map_error([](auto E) {
191	477k	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Element));
192	477k	return E;
193	477k	}));
194	477k	ElemSeg.getInitExprs().back().getInstrs().emplace_back(
195	477k	std::move(RefFunc));
196	477k	ElemSeg.getInitExprs().back().getInstrs().emplace_back(std::move(End));
197	477k	}
198	6.12k	break;
199	6.17k	}
200	6.12k	default:
201	2.10k	break;
202	8.40k	}
203
204		// Set the default reference type.
205	8.23k	if (Check == 0x04) {
206	1.37k	ElemSeg.setRefType(TypeCode::FuncRef);
207	6.85k	} else {
208	6.85k	ElemSeg.setRefType(ValType(TypeCode::Ref, TypeCode::FuncRef));
209	6.85k	}
210
211		// Read the reference type and init expressions.
212	8.23k	switch (Check) {
213	219	case 0x05:
214	486	case 0x06:
215	736	case 0x07: {
216		// The AST node information is handled.
217	736	EXPECTED_TRY(auto Type, loadRefType(ASTNodeAttr::Seg_Element));
218	719	ElemSeg.setRefType(Type);
219	719	[[fallthrough]];
220	719	}
221	2.09k	case 0x04: {
222	2.09k	return loadVec<AST::ElementSegment>(
223	3.60k	ElemSeg.getInitExprs(), [this](AST::Expression &Expr) -> Expect<void> {
224	3.60k	return loadExpression(Expr);
225	3.60k	});
226	719	}
227
228	6.12k	default:
229	6.12k	break;
230	8.23k	}
231
232	6.12k	return {};
233	8.23k	}
234
235		// Load binary of CodeSegment node. See "include/loader/loader.h".
236	20.0k	Expect<void> Loader::loadSegment(AST::CodeSegment &CodeSeg) {
237	20.0k	auto ReportError = [this](auto E) {
238	110	return logLoadError(E, FMgr.getLastOffset(), ASTNodeAttr::Seg_Code);
239	110	};
240
241		// Read the code segment size.
242	20.0k	EXPECTED_TRY(FMgr.readU32().map_error(ReportError).map([&](auto S) {
243	19.9k	CodeSeg.setSegSize(S);
244	19.9k	}));
245	19.9k	auto ExprSizeBound = FMgr.getOffset() + CodeSeg.getSegSize();
246
247		// Read the vector of local variable counts and types.
248	19.9k	EXPECTED_TRY(uint32_t VecCnt, loadVecCnt().map_error(ReportError));
249	19.9k	CodeSeg.getLocals().clear();
250	19.9k	CodeSeg.getLocals().reserve(VecCnt);
251	19.9k	uint32_t TotalLocalCnt = 0;
252	30.5k	for (uint32_t I = 0; I < VecCnt; ++I) {
253	10.8k	EXPECTED_TRY(uint32_t LocalCnt, FMgr.readU32().map_error(ReportError));
254		// Total local variables should not exceed 2^32. Capped at 2^26.
255	10.7k	if (UINT32_C(67108864) - TotalLocalCnt < LocalCnt) {
256	23	return logLoadError(ErrCode::Value::TooManyLocals, FMgr.getLastOffset(),
257	23	ASTNodeAttr::Seg_Code);
258	23	}
259	10.7k	TotalLocalCnt += LocalCnt;
260		// Read the value type.
261		// The AST node information is handled.
262	10.7k	EXPECTED_TRY(ValType LocalType, loadValType(ASTNodeAttr::Seg_Code));
263	10.6k	CodeSeg.getLocals().push_back(std::make_pair(LocalCnt, LocalType));
264	10.6k	}
265
266	19.7k	if (Conf.getRuntimeConfigure().getRunMode() == RunMode::AOT &&
267	0	WASMType != InputType::WASM) {
268		// In AOT run mode with an AOT artifact, skip parsing the function body.
269	0	FMgr.seek(ExprSizeBound);
270	19.7k	} else {
271		// Read function body with expected expression size.
272	19.7k	EXPECTED_TRY(
273	19.7k	loadExpression(CodeSeg.getExpr(), ExprSizeBound).map_error([](auto E) {
274	19.7k	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Code));
275	19.7k	return E;
276	19.7k	}));
277	19.7k	}
278
279	17.7k	return {};
280	19.7k	}
281
282		// Load binary of DataSegment node. See "include/loader/loader.h".
283	6.70k	Expect<void> Loader::loadSegment(AST::DataSegment &DataSeg) {
284	6.70k	auto ReportError = [this](auto E) {
285	112	return logLoadError(E, FMgr.getLastOffset(), ASTNodeAttr::Seg_Data);
286	112	};
287	6.70k	DataSeg.setMode(AST::DataSegment::DataMode::Passive);
288	6.70k	DataSeg.setIdx(0);
289
290		// Data segment binary format:
291		// ----------------------------------------
292		// Mode \| MemoryIdx \| OffExpr \| vec(byte)
293		// ------\|-----------\|---------\|-----------
294		// 0 \| \| v \| v
295		// 1 \| \| \| v
296		// 2 \| v \| v \| v
297		// ----------------------------------------
298		// Mode: data initial integer, u32
299		// MemoryIdx: target memory index, u32
300		// OffExpr: init offset expression, expr
301		// vec(byte): init data, vec(u8)
302
303		// Read the checking byte.
304	6.70k	EXPECTED_TRY(uint32_t Check, FMgr.readU32().map_error(ReportError));
305		// Check > 0 cases are for BulkMemoryOperations or ReferenceTypes proposal.
306	6.68k	if (Check > 0 && !Conf.hasProposal(Proposal::BulkMemoryOperations) &&
307	0	!Conf.hasProposal(Proposal::ReferenceTypes)) {
308	0	return logNeedProposal(ErrCode::Value::ExpectedZeroByte,
309	0	Proposal::BulkMemoryOperations, FMgr.getLastOffset(),
310	0	ASTNodeAttr::Seg_Data);
311	0	}
312
313	6.68k	switch (Check) {
314	1.01k	case 0x02: // 0x02 memidx expr vec(byte) , Active
315		// Read target memory index.
316	1.01k	EXPECTED_TRY(FMgr.readU32().map_error(ReportError).map([&](auto Idx) {
317	1.01k	DataSeg.setIdx(Idx);
318	1.01k	}));
319	1.01k	[[fallthrough]];
320
321	4.57k	case 0x00: // 0x00 expr vec(byte) , Active
322		// Read the offset expression.
323	4.57k	EXPECTED_TRY(loadExpression(DataSeg.getExpr()).map_error([](auto E) {
324	2.33k	spdlog::error(ErrInfo::InfoAST(ASTNodeAttr::Seg_Data));
325	2.33k	return E;
326	2.33k	}));
327	2.33k	DataSeg.setMode(AST::DataSegment::DataMode::Active);
328	2.33k	[[fallthrough]];
329
330	4.35k	case 0x01: // 0x01 vec(byte) , Passive
331	4.35k	{
332		// Read initialization data.
333	4.35k	EXPECTED_TRY(uint32_t VecCnt, loadVecCnt().map_error(ReportError));
334	4.26k	EXPECTED_TRY(FMgr.readBytes(VecCnt).map_error(ReportError).map([&](auto V) {
335	4.25k	DataSeg.getData() = std::move(V);
336	4.25k	}));
337	4.25k	break;
338	4.26k	}
339	4.25k	default:
340		// TODO: Correct the error code once there's spec test.
341	101	return logLoadError(ErrCode::Value::IllegalGrammar, FMgr.getLastOffset(),
342	101	ASTNodeAttr::Seg_Data);
343	6.68k	}
344	4.25k	return {};
345	6.68k	}
346
347		} // namespace Loader
348		} // namespace WasmEdge