1 //===- InputElement.h ----------------------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #ifndef LLD_WASM_INPUT_ELEMENT_H
10 #define LLD_WASM_INPUT_ELEMENT_H
11 
12 #include "Config.h"
13 #include "InputFiles.h"
14 #include "WriterUtils.h"
15 #include "lld/Common/LLVM.h"
16 #include "llvm/Object/Wasm.h"
17 
18 namespace lld {
19 namespace wasm {
20 
21 // Represents a single element (Global, Tag, Table, etc) within an input
22 // file.
23 class InputElement {
24 protected:
25   InputElement(StringRef name, ObjFile *f)
26       : file(f), live(!config->gcSections), name(name) {}
27 
28 public:
29   StringRef getName() const { return name; }
30   uint32_t getAssignedIndex() const { return assignedIndex.getValue(); }
31   bool hasAssignedIndex() const { return assignedIndex.hasValue(); }
32   void assignIndex(uint32_t index) {
33     assert(!hasAssignedIndex());
34     assignedIndex = index;
35   }
36 
37   ObjFile *file;
38   bool live = false;
39 
40 protected:
41   StringRef name;
42   llvm::Optional<uint32_t> assignedIndex;
43 };
44 
45 inline WasmInitExpr intConst(uint64_t value, bool is64) {
46   WasmInitExpr ie;
47   ie.Extended = false;
48   if (is64) {
49     ie.Inst.Opcode = llvm::wasm::WASM_OPCODE_I64_CONST;
50     ie.Inst.Value.Int64 = static_cast<int64_t>(value);
51   } else {
52     ie.Inst.Opcode = llvm::wasm::WASM_OPCODE_I32_CONST;
53     ie.Inst.Value.Int32 = static_cast<int32_t>(value);
54   }
55   return ie;
56 }
57 
58 class InputGlobal : public InputElement {
59 public:
60   InputGlobal(const WasmGlobal &g, ObjFile *f)
61       : InputElement(g.SymbolName, f), type(g.Type), initExpr(g.InitExpr) {}
62 
63   const WasmGlobalType &getType() const { return type; }
64   const WasmInitExpr &getInitExpr() const { return initExpr; }
65 
66   void setPointerValue(uint64_t value) {
67     initExpr = intConst(value, config->is64.value_or(false));
68   }
69 
70 private:
71   WasmGlobalType type;
72   WasmInitExpr initExpr;
73 };
74 
75 class InputTag : public InputElement {
76 public:
77   InputTag(const WasmSignature &s, const WasmTag &t, ObjFile *f)
78       : InputElement(t.SymbolName, f), signature(s) {}
79 
80   const WasmSignature &signature;
81 };
82 
83 class InputTable : public InputElement {
84 public:
85   InputTable(const WasmTable &t, ObjFile *f)
86       : InputElement(t.SymbolName, f), type(t.Type) {}
87 
88   const WasmTableType &getType() const { return type; }
89   void setLimits(const WasmLimits &limits) { type.Limits = limits; }
90 
91 private:
92   WasmTableType type;
93 };
94 
95 } // namespace wasm
96 
97 inline std::string toString(const wasm::InputElement *d) {
98   return (toString(d->file) + ":(" + d->getName() + ")").str();
99 }
100 
101 } // namespace lld
102 
103 #endif // LLD_WASM_INPUT_ELEMENT_H
104