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[WebAssembly] Add throw/rethrow builtins for exception handling 

Summary:
Add new builtins for throw/rethrow instructions. This follows exception handling
handling proposal in
https://github.com/WebAssembly/exception-handling/blob/master/proposals/Exceptions.md

Reviewers: sunfish, dschuff

Reviewed By: dschuff

Subscribers: jfb, dschuff, sbc100, jgravelle-google

Differential Revision: https://reviews.llvm.org/D34783

llvm-svn: 306775
This commit is contained in:
Heejin Ahn 2017-06-30 00:44:01 +00:00
parent ac62b05d05
commit b92440eab0
3 changed files with 26 additions and 0 deletions
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4
clang/include/clang/Basic/BuiltinsWebAssembly.def
View File

@ -21,4 +21,8 @@
BUILTIN(__builtin_wasm_current_memory, "z", "n")
BUILTIN(__builtin_wasm_grow_memory, "zz", "n")
// Exception handling builtins.
BUILTIN(__builtin_wasm_throw, "vUiv*", "r")
BUILTIN(__builtin_wasm_rethrow, "v", "r")
#undef BUILTIN

10
clang/lib/CodeGen/CGBuiltin.cpp
View File

@ -9372,6 +9372,16 @@ Value *CodeGenFunction::EmitWebAssemblyBuiltinExpr(unsigned BuiltinID,
Value *Callee = CGM.getIntrinsic(Intrinsic::wasm_grow_memory, X->getType());
return Builder.CreateCall(Callee, X);
}
case WebAssembly::BI__builtin_wasm_throw: {
Value *Tag = EmitScalarExpr(E->getArg(0));
Value *Obj = EmitScalarExpr(E->getArg(1));
Value *Callee = CGM.getIntrinsic(Intrinsic::wasm_throw);
return Builder.CreateCall(Callee, {Tag, Obj});
}
case WebAssembly::BI__builtin_wasm_rethrow: {
Value *Callee = CGM.getIntrinsic(Intrinsic::wasm_rethrow);
return Builder.CreateCall(Callee);
}
default:
return nullptr;

12
clang/test/CodeGen/builtins-wasm.c
View File

@ -14,3 +14,15 @@ __SIZE_TYPE__ f2(__SIZE_TYPE__ delta) {
// WEBASSEMBLY32: call i32 @llvm.wasm.grow.memory.i32(i32 %{{.*}})
// WEBASSEMBLY64: call i64 @llvm.wasm.grow.memory.i64(i64 %{{.*}})
}
void f3(unsigned int tag, void *obj) {
return __builtin_wasm_throw(tag, obj);
// WEBASSEMBLY32: call void @llvm.wasm.throw(i32 %{{.*}}, i8* %{{.*}})
// WEBASSEMBLY64: call void @llvm.wasm.throw(i32 %{{.*}}, i8* %{{.*}})
}
void f4() {
return __builtin_wasm_rethrow();
// WEBASSEMBLY32: call void @llvm.wasm.rethrow()
// WEBASSEMBLY64: call void @llvm.wasm.rethrow()
}