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[wasm] Pass --table-base to linker to reserve low function addresses #1987

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Merged
merged 1 commit into from
Sep 15, 2025
Merged

[wasm] Pass --table-base to linker to reserve low function addresses #1987

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5 changes: 4 additions & 1 deletion Sources/SwiftDriver/Jobs/WebAssemblyToolchain+LinkerSupport.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -160,8 +160,11 @@ extension WebAssemblyToolchain {
// The value of lowest valid address, called "global base", must be always
// synchronized with `SWIFT_ABI_WASM32_LEAST_VALID_POINTER` defined in
// apple/swift's runtime library.
let SWIFT_ABI_WASM32_LEAST_VALID_POINTER = 4096
commandLine.appendFlag(.Xlinker)
commandLine.appendFlag("--global-base=4096")
commandLine.appendFlag("--global-base=\(SWIFT_ABI_WASM32_LEAST_VALID_POINTER)")
commandLine.appendFlag(.Xlinker)
commandLine.appendFlag("--table-base=\(SWIFT_ABI_WASM32_LEAST_VALID_POINTER)")

// Delegate to Clang for sanitizers. It will figure out the correct linker
// options.
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1 change: 1 addition & 0 deletions Tests/SwiftDriverTests/SwiftDriverTests.swift
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Expand Up @@ -2498,6 +2498,7 @@ final class SwiftDriverTests: XCTestCase {
XCTAssertTrue(commandContainsTemporaryResponsePath(cmd, "Test.autolink"))
XCTAssertTrue(cmd.contains(.responseFilePath(.absolute(path.appending(components: "wasi", "static-executable-args.lnk")))))
XCTAssertTrue(cmd.contains(subsequence: [.flag("-Xlinker"), .flag("--global-base=4096")]))
XCTAssertTrue(cmd.contains(subsequence: [.flag("-Xlinker"), .flag("--table-base=4096")]))
XCTAssertTrue(cmd.contains(.flag("-O3")))
XCTAssertEqual(linkJob.outputs[0].file, try toPath("Test"))

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