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[WebAssembly] Basic support for Wasm object file encoding.

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With the "wasm32-unknown-unknown-wasm" triple, this allows writing out
simple wasm object files, and is another step in a larger series toward
migrating from ELF to general wasm object support. Note that this code
and the binary format itself is still experimental.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296190 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2017-02-24 23:18:00 +00:00
parent 03791bdecb
commit 53ff96ab08
64 changed files with 2073 additions and 388 deletions
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lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+58 -3
View File
@@ -1162,18 +1162,73 @@ void TargetLoweringObjectFileCOFF::emitLinkerFlagsForGlobal(
// Wasm
//===----------------------------------------------------------------------===//
static const Comdat *getWasmComdat(const GlobalValue *GV) {
const Comdat *C = GV->getComdat();
if (!C)
return nullptr;
if (C->getSelectionKind() != Comdat::Any)
report_fatal_error("Wasm COMDATs only support SelectionKind::Any, '" +
C->getName() + "' cannot be lowered.");
return C;
}
MCSection *TargetLoweringObjectFileWasm::getExplicitSectionGlobal(
const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
llvm_unreachable("getExplicitSectionGlobal not yet implemented");
return nullptr;
}
static MCSectionWasm *
selectWasmSectionForGlobal(MCContext &Ctx, const GlobalObject *GO,
SectionKind Kind, Mangler &Mang,
const TargetMachine &TM, bool EmitUniqueSection,
unsigned Flags, unsigned *NextUniqueID) {
StringRef Group = "";
if (getWasmComdat(GO))
llvm_unreachable("comdat not yet supported for wasm");
bool UniqueSectionNames = TM.getUniqueSectionNames();
SmallString<128> Name = getSectionPrefixForGlobal(Kind);
if (const auto *F = dyn_cast<Function>(GO)) {
const auto &OptionalPrefix = F->getSectionPrefix();
if (OptionalPrefix)
Name += *OptionalPrefix;
}
if (EmitUniqueSection && UniqueSectionNames) {
Name.push_back('.');
TM.getNameWithPrefix(Name, GO, Mang, true);
}
unsigned UniqueID = MCContext::GenericSectionID;
if (EmitUniqueSection && !UniqueSectionNames) {
UniqueID = *NextUniqueID;
(*NextUniqueID)++;
}
return Ctx.getWasmSection(Name, /*Type=*/0, Flags,
Group, UniqueID);
}
MCSection *TargetLoweringObjectFileWasm::SelectSectionForGlobal(
const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
if (Kind.isCommon())
report_fatal_error("mergable sections not supported yet on wasm");
// If we have -ffunction-section or -fdata-section then we should emit the
// global value to a uniqued section specifically for it.
bool EmitUniqueSection = false;
if (Kind.isText())
return TextSection;
assert(!Kind.isMetadata() && "metadata sections not yet implemented");
return DataSection;
EmitUniqueSection = TM.getFunctionSections();
else
EmitUniqueSection = TM.getDataSections();
EmitUniqueSection |= GO->hasComdat();
return selectWasmSectionForGlobal(getContext(), GO, Kind, getMangler(), TM,
EmitUniqueSection, /*Flags=*/0,
&NextUniqueID);
}
bool TargetLoweringObjectFileWasm::shouldPutJumpTableInFunctionSection(