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This adds support for building WASI shared libraries per https://github.com/WebAssembly/tool-conventions/blob/main/DynamicLinking.md. For the time being, the goal is to allow "pseudo-dynamic" linking using the Component Model per https://github.com/WebAssembly/component-model/blob/main/design/mvp/examples/SharedEverythingDynamicLinking.md. This requires all libraries to be available when the component is created, but still allows runtime symbol resolution via `dlopen`/`dlsym` backed by a static lookup table. This is sufficient to support Python native extensions, for example. A complete demo using `wit-component` is available at https://github.com/dicej/component-linking-demo. This requires https://reviews.llvm.org/D153293, which we will need to backport to LLVM 16 until 17 is released, hence the llvm-D153293-backport.patch file. Signed-off-by: Joel Dice <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,9 +1,9 @@ | ||
| [submodule "src/llvm-project"] | ||
| path = src/llvm-project | ||
| url = https://github.com/llvm/llvm-project | ||
| path = src/llvm-project | ||
| url = https://github.com/llvm/llvm-project | ||
| [submodule "src/wasi-libc"] | ||
| path = src/wasi-libc | ||
| url = https://github.com/CraneStation/wasi-libc | ||
| path = src/wasi-libc | ||
| url = https://github.com/dicej/wasi-libc | ||
| [submodule "src/config"] | ||
| path = src/config | ||
| url = https://git.savannah.gnu.org/git/config.git | ||
| path = src/config | ||
| url = https://git.savannah.gnu.org/git/config.git |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| diff --git a/clang/lib/Driver/ToolChains/WebAssembly.cpp b/clang/lib/Driver/ToolChains/WebAssembly.cpp | ||
| index a1c4cd9ef9c7..4cbc0794f420 100644 | ||
| --- a/clang/lib/Driver/ToolChains/WebAssembly.cpp | ||
| +++ b/clang/lib/Driver/ToolChains/WebAssembly.cpp | ||
| @@ -101,13 +101,16 @@ void wasm::Linker::ConstructJob(Compilation &C, const JobAction &JA, | ||
| << CM << A->getOption().getName(); | ||
| } | ||
| } | ||
| - if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) | ||
| + if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles, options::OPT_shared)) | ||
| CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(Crt1))); | ||
| if (Entry) { | ||
| CmdArgs.push_back(Args.MakeArgString("--entry")); | ||
| CmdArgs.push_back(Args.MakeArgString(Entry)); | ||
| } | ||
|
|
||
| + if (Args.hasArg(options::OPT_shared)) | ||
| + CmdArgs.push_back(Args.MakeArgString("-shared")); | ||
| + | ||
| AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA); | ||
|
|
||
| if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) { | ||
| diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp | ||
| index 630c786a3dc7..788e08e3c8a9 100644 | ||
| --- a/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp | ||
| +++ b/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp | ||
| @@ -98,13 +98,6 @@ static Reloc::Model getEffectiveRelocModel(std::optional<Reloc::Model> RM, | ||
| return Reloc::Static; | ||
| } | ||
|
|
||
| - if (!TT.isOSEmscripten()) { | ||
| - // Relocation modes other than static are currently implemented in a way | ||
| - // that only works for Emscripten, so disable them if we aren't targeting | ||
| - // Emscripten. | ||
| - return Reloc::Static; | ||
| - } | ||
| - | ||
| return *RM; | ||
| } | ||
|
|
Submodule wasi-libc
updated
24 files