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[Wasm][IRGen] Add initial support for absolute function pointer

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On some Harvard architectures like WebAssembly that allow sliding code
and data address space offsets independently, it's impossible to make
direct relative reference to code from data because the relative offset
between them is not representable.
Use absolute function references instead of relative ones on such targets.
This commit is contained in:
Yuta Saito
2022-03-30 05:13:31 +00:00
parent 66999cecc3
commit 43a25e89b7
13 changed files with 120 additions and 47 deletions
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8
lib/Frontend/CompilerInvocation.cpp
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@@ -2153,6 +2153,14 @@ static bool ParseIRGenArgs(IRGenOptions &Opts, ArgList &Args,
// AsyncFunctionPointer access.
Opts.IndirectAsyncFunctionPointer = Triple.isOSBinFormatCOFF();
// On some Harvard architectures that allow sliding code and data address space
// offsets independently, it's impossible to make direct relative reference to
// code from data because the relative offset between them is not representable.
// Use absolute function references instead of relative ones on such targets.
// TODO(katei): This is a short-term solution until the WebAssembly target stabilizes
// PIC and 64-bit specifications and toolchain support.
Opts.CompactAbsoluteFunctionPointer = Triple.isOSBinFormatWasm();
if (Args.hasArg(OPT_disable_legacy_type_info)) {
Opts.DisableLegacyTypeInfo = true;
}