Replicate framework as per elf

Author: anutosh491

lld/wasm/Config.h

@@ -32,7 +32,11 @@ class InputTable;
 class InputGlobal;
 class InputFunction;
 class Symbol;
-struct WasmSym;
+class DefinedData;
+class GlobalSymbol;
+class DefinedFunction;
+class UndefinedGlobal;
+class TableSymbol;
 
 // For --unresolved-symbols.
 enum class UnresolvedPolicy { ReportError, Warn, Ignore, ImportDynamic };
@@ -142,8 +146,109 @@ struct Ctx {
   llvm::SmallVector<InputGlobal *, 0> syntheticGlobals;
   llvm::SmallVector<InputTable *, 0> syntheticTables;
 
-  // Linker-generated symbols like __wasm_init_memory, __heap_base, etc.
-  WasmSym sym{};
+  // linker-generated symbols
+  struct WasmSym {
+    // __global_base
+    // Symbol marking the start of the global section.
+    DefinedData *globalBase;
+
+    // __stack_pointer/__stack_low/__stack_high
+    // Global that holds current value of stack pointer and data symbols marking
+    // the start and end of the stack region.  stackPointer is initialized to
+    // stackHigh and grows downwards towards stackLow
+    GlobalSymbol *stackPointer;
+    DefinedData *stackLow;
+    DefinedData *stackHigh;
+
+    // __tls_base
+    // Global that holds the address of the base of the current thread's
+    // TLS block.
+    GlobalSymbol *tlsBase;
+
+    // __tls_size
+    // Symbol whose value is the size of the TLS block.
+    GlobalSymbol *tlsSize;
+
+    // __tls_size
+    // Symbol whose value is the alignment of the TLS block.
+    GlobalSymbol *tlsAlign;
+
+    // __data_end
+    // Symbol marking the end of the data and bss.
+    DefinedData *dataEnd;
+
+    // __heap_base/__heap_end
+    // Symbols marking the beginning and end of the "heap". It starts at the end
+    // of the data, bss and explicit stack, and extends to the end of the linear
+    // memory allocated by wasm-ld. This region of memory is not used by the
+    // linked code, so it may be used as a backing store for `sbrk` or `malloc`
+    // implementations.
+    DefinedData *heapBase;
+    DefinedData *heapEnd;
+
+    // __wasm_first_page_end
+    // A symbol whose address is the end of the first page in memory (if any).
+    DefinedData *firstPageEnd;
+
+    // __wasm_init_memory_flag
+    // Symbol whose contents are nonzero iff memory has already been initialized.
+    DefinedData *initMemoryFlag;
+
+    // __wasm_init_memory
+    // Function that initializes passive data segments during instantiation.
+    DefinedFunction *initMemory;
+
+    // __wasm_call_ctors
+    // Function that directly calls all ctors in priority order.
+    DefinedFunction *callCtors;
+
+    // __wasm_call_dtors
+    // Function that calls the libc/etc. cleanup function.
+    DefinedFunction *callDtors;
+
+    // __wasm_apply_global_relocs
+    // Function that applies relocations to wasm globals post-instantiation.
+    // Unlike __wasm_apply_data_relocs this needs to run on every thread.
+    DefinedFunction *applyGlobalRelocs;
+
+    // __wasm_apply_tls_relocs
+    // Like __wasm_apply_data_relocs but for TLS section.  These must be
+    // delayed until __wasm_init_tls.
+    DefinedFunction *applyTLSRelocs;
+
+    // __wasm_apply_global_tls_relocs
+    // Like applyGlobalRelocs but for globals that hold TLS addresses.  These
+    // must be delayed until __wasm_init_tls.
+    DefinedFunction *applyGlobalTLSRelocs;
+
+    // __wasm_init_tls
+    // Function that allocates thread-local storage and initializes it.
+    DefinedFunction *initTLS;
+
+    // Pointer to the function that is to be used in the start section.
+    // (normally an alias of initMemory, or applyGlobalRelocs).
+    DefinedFunction *startFunction;
+
+    // __dso_handle
+    // Symbol used in calls to __cxa_atexit to determine current DLL
+    DefinedData *dsoHandle;
+
+    // __table_base
+    // Used in PIC code for offset of indirect function table
+    UndefinedGlobal *tableBase;
+    DefinedData *definedTableBase;
+
+    // __memory_base
+    // Used in PIC code for offset of global data
+    UndefinedGlobal *memoryBase;
+    DefinedData *definedMemoryBase;
+
+    // __indirect_function_table
+    // Used as an address space for function pointers, with each function that is
+    // used as a function pointer being allocated a slot.
+    TableSymbol *indirectFunctionTable;
+  };
+  WasmSym sym;
 
   // True if we are creating position-independent code.
   bool isPic = false;

lld/wasm/Symbols.h

@@ -537,109 +537,6 @@ class LazySymbol : public Symbol {
   const WasmSignature *signature = nullptr;
 };
 
-// linker-generated symbols
-struct WasmSym {
-  // __global_base
-  // Symbol marking the start of the global section.
-  DefinedData *globalBase;
-
-  // __stack_pointer/__stack_low/__stack_high
-  // Global that holds current value of stack pointer and data symbols marking
-  // the start and end of the stack region.  stackPointer is initialized to
-  // stackHigh and grows downwards towards stackLow
-  GlobalSymbol *stackPointer;
-  DefinedData *stackLow;
-  DefinedData *stackHigh;
-
-  // __tls_base
-  // Global that holds the address of the base of the current thread's
-  // TLS block.
-  GlobalSymbol *tlsBase;
-
-  // __tls_size
-  // Symbol whose value is the size of the TLS block.
-  GlobalSymbol *tlsSize;
-
-  // __tls_size
-  // Symbol whose value is the alignment of the TLS block.
-  GlobalSymbol *tlsAlign;
-
-  // __data_end
-  // Symbol marking the end of the data and bss.
-  DefinedData *dataEnd;
-
-  // __heap_base/__heap_end
-  // Symbols marking the beginning and end of the "heap". It starts at the end
-  // of the data, bss and explicit stack, and extends to the end of the linear
-  // memory allocated by wasm-ld. This region of memory is not used by the
-  // linked code, so it may be used as a backing store for `sbrk` or `malloc`
-  // implementations.
-  DefinedData *heapBase;
-  DefinedData *heapEnd;
-
-  // __wasm_first_page_end
-  // A symbol whose address is the end of the first page in memory (if any).
-  DefinedData *firstPageEnd;
-
-  // __wasm_init_memory_flag
-  // Symbol whose contents are nonzero iff memory has already been initialized.
-  DefinedData *initMemoryFlag;
-
-  // __wasm_init_memory
-  // Function that initializes passive data segments during instantiation.
-  DefinedFunction *initMemory;
-
-  // __wasm_call_ctors
-  // Function that directly calls all ctors in priority order.
-  DefinedFunction *callCtors;
-
-  // __wasm_call_dtors
-  // Function that calls the libc/etc. cleanup function.
-  DefinedFunction *callDtors;
-
-  // __wasm_apply_global_relocs
-  // Function that applies relocations to wasm globals post-instantiation.
-  // Unlike __wasm_apply_data_relocs this needs to run on every thread.
-  DefinedFunction *applyGlobalRelocs;
-
-  // __wasm_apply_tls_relocs
-  // Like __wasm_apply_data_relocs but for TLS section.  These must be
-  // delayed until __wasm_init_tls.
-  DefinedFunction *applyTLSRelocs;
-
-  // __wasm_apply_global_tls_relocs
-  // Like applyGlobalRelocs but for globals that hold TLS addresses.  These
-  // must be delayed until __wasm_init_tls.
-  DefinedFunction *applyGlobalTLSRelocs;
-
-  // __wasm_init_tls
-  // Function that allocates thread-local storage and initializes it.
-  DefinedFunction *initTLS;
-
-  // Pointer to the function that is to be used in the start section.
-  // (normally an alias of initMemory, or applyGlobalRelocs).
-  DefinedFunction *startFunction;
-
-  // __dso_handle
-  // Symbol used in calls to __cxa_atexit to determine current DLL
-  DefinedData *dsoHandle;
-
-  // __table_base
-  // Used in PIC code for offset of indirect function table
-  UndefinedGlobal *tableBase;
-  DefinedData *definedTableBase;
-
-  // __memory_base
-  // Used in PIC code for offset of global data
-  UndefinedGlobal *memoryBase;
-  DefinedData *definedMemoryBase;
-
-  // __indirect_function_table
-  // Used as an address space for function pointers, with each function that is
-  // used as a function pointer being allocated a slot.
-  TableSymbol *indirectFunctionTable;
-};
-
 // A buffer class that is large enough to hold any Symbol-derived
 // object. We allocate memory using this class and instantiate a symbol
 // using the placement new.