WebAssemblyTargetMachine.cpp [plain text]
#include "WebAssembly.h"
#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
#include "WebAssemblyTargetMachine.h"
#include "WebAssemblyTargetObjectFile.h"
#include "WebAssemblyTargetTransformInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/RegAllocRegistry.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Transforms/Scalar.h"
using namespace llvm;
#define DEBUG_TYPE "wasm"
extern "C" void LLVMInitializeWebAssemblyTarget() {
RegisterTargetMachine<WebAssemblyTargetMachine> X(TheWebAssemblyTarget32);
RegisterTargetMachine<WebAssemblyTargetMachine> Y(TheWebAssemblyTarget64);
}
WebAssemblyTargetMachine::WebAssemblyTargetMachine(
const Target &T, const Triple &TT, StringRef CPU, StringRef FS,
const TargetOptions &Options, Reloc::Model RM, CodeModel::Model CM,
CodeGenOpt::Level OL)
: LLVMTargetMachine(T,
TT.isArch64Bit() ? "e-m:e-p:64:64-i64:64-n32:64-S128"
: "e-m:e-p:32:32-i64:64-n32:64-S128",
TT, CPU, FS, Options, RM, CM, OL),
TLOF(make_unique<WebAssemblyTargetObjectFile>()) {
this->Options.TrapUnreachable = true;
initAsmInfo();
setRequiresStructuredCFG(true);
}
WebAssemblyTargetMachine::~WebAssemblyTargetMachine() {}
const WebAssemblySubtarget *
WebAssemblyTargetMachine::getSubtargetImpl(const Function &F) const {
Attribute CPUAttr = F.getFnAttribute("target-cpu");
Attribute FSAttr = F.getFnAttribute("target-features");
std::string CPU = !CPUAttr.hasAttribute(Attribute::None)
? CPUAttr.getValueAsString().str()
: TargetCPU;
std::string FS = !FSAttr.hasAttribute(Attribute::None)
? FSAttr.getValueAsString().str()
: TargetFS;
auto &I = SubtargetMap[CPU + FS];
if (!I) {
resetTargetOptions(F);
I = llvm::make_unique<WebAssemblySubtarget>(TargetTriple, CPU, FS, *this);
}
return I.get();
}
namespace {
class WebAssemblyPassConfig final : public TargetPassConfig {
public:
WebAssemblyPassConfig(WebAssemblyTargetMachine *TM, PassManagerBase &PM)
: TargetPassConfig(TM, PM) {}
WebAssemblyTargetMachine &getWebAssemblyTargetMachine() const {
return getTM<WebAssemblyTargetMachine>();
}
FunctionPass *createTargetRegisterAllocator(bool) override;
void addIRPasses() override;
bool addInstSelector() override;
bool addILPOpts() override;
void addPreRegAlloc() override;
void addPostRegAlloc() override;
void addPreEmitPass() override;
};
}
TargetIRAnalysis WebAssemblyTargetMachine::getTargetIRAnalysis() {
return TargetIRAnalysis([this](const Function &F) {
return TargetTransformInfo(WebAssemblyTTIImpl(this, F));
});
}
TargetPassConfig *
WebAssemblyTargetMachine::createPassConfig(PassManagerBase &PM) {
return new WebAssemblyPassConfig(this, PM);
}
FunctionPass *WebAssemblyPassConfig::createTargetRegisterAllocator(bool) {
return nullptr; }
void WebAssemblyPassConfig::addIRPasses() {
if (TM->Options.ThreadModel == ThreadModel::Single)
addPass(createLowerAtomicPass());
else
addPass(createAtomicExpandPass(TM));
addPass(createWebAssemblyOptimizeReturned());
TargetPassConfig::addIRPasses();
}
bool WebAssemblyPassConfig::addInstSelector() {
(void)TargetPassConfig::addInstSelector();
addPass(
createWebAssemblyISelDag(getWebAssemblyTargetMachine(), getOptLevel()));
addPass(createWebAssemblyArgumentMove());
return false;
}
bool WebAssemblyPassConfig::addILPOpts() {
(void)TargetPassConfig::addILPOpts();
return true;
}
void WebAssemblyPassConfig::addPreRegAlloc() {
TargetPassConfig::addPreRegAlloc();
addPass(createWebAssemblyStoreResults());
}
void WebAssemblyPassConfig::addPostRegAlloc() {
disablePass(&PrologEpilogCodeInserterID);
disablePass(&MachineCopyPropagationID);
addPass(createWebAssemblyRegStackify());
addPass(createWebAssemblyRegColoring());
TargetPassConfig::addPostRegAlloc();
addPass(createWebAssemblyPEI());
}
void WebAssemblyPassConfig::addPreEmitPass() {
TargetPassConfig::addPreEmitPass();
addPass(createWebAssemblyCFGStackify());
addPass(createWebAssemblyLowerBrUnless());
addPass(createWebAssemblyRegNumbering());
addPass(createWebAssemblyPeephole());
}