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[WebAssembly] Generate a call to __wasm_apply_global_tls_relocs in __wasm_init_memory #149832

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[WebAssembly] Generate a call to __wasm_apply_global_tls_relocs in __wasm_init_memory #149832

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738d8b1
Generate a call to __wasm_apply_global_tls_relocs in __wasm_init_memory
Arshia001 Jul 21, 2025
d517621
* Update comment on `lld::wasm::Writer::createApplyGlobalTLSRelocatio…
Arshia001 Jul 22, 2025
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12 changes: 10 additions & 2 deletions lld/wasm/Writer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1366,6 +1366,14 @@ void Writer::createInitMemoryFunction() {
writeUleb128(os, s->index, "segment index immediate");
writeU8(os, 0, "memory index immediate");
}

// After initializing the TLS segment, we also need to apply TLS
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How about "After initializing the TLS segment and setting __tls_base we can call __wasm_apply_global_tls_relocs"

// relocations in the same way __wasm_init_tls does.
if (s->isTLS() && ctx.sym.applyGlobalTLSRelocs) {
writeU8(os, WASM_OPCODE_CALL, "CALL");
writeUleb128(os, ctx.sym.applyGlobalTLSRelocs->getFunctionIndex(),
"function index");
}
}
}

Expand Down Expand Up @@ -1518,8 +1526,8 @@ void Writer::createApplyGlobalRelocationsFunction() {
}

// Similar to createApplyGlobalRelocationsFunction but for
// TLS symbols. This cannot be run during the start function
// but must be delayed until __wasm_init_tls is called.
// TLS symbols. Can only be called after __tls_base is
// initialized.
void Writer::createApplyGlobalTLSRelocationsFunction() {
// First write the body's contents to a string.
std::string bodyContent;
Expand Down