webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 175 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/b3/B3PatchpointSpecial.cpp b/Source/JavaScriptCore/b3/B3PatchpointSpecial.cpp
new file mode 100644
index 000000000..c5fc5885d
--- /dev/null
+++ b/Source/JavaScriptCore/b3/B3PatchpointSpecial.cpp
@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2015-2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "B3PatchpointSpecial.h"
+
+#if ENABLE(B3_JIT)
+
+#include "AirGenerationContext.h"
+#include "B3StackmapGenerationParams.h"
+#include "B3ValueInlines.h"
+
+namespace JSC { namespace B3 {
+
+using namespace Air;
+
+PatchpointSpecial::PatchpointSpecial()
+{
+}
+
+PatchpointSpecial::~PatchpointSpecial()
+{
+}
+
+void PatchpointSpecial::forEachArg(Inst& inst, const ScopedLambda<Inst::EachArgCallback>& callback)
+{
+    PatchpointValue* patchpoint = inst.origin->as<PatchpointValue>();
+    unsigned argIndex = 1;
+
+    if (patchpoint->type() != Void) {
+        Arg::Role role;
+        if (patchpoint->resultConstraint.kind() == ValueRep::SomeEarlyRegister)
+            role = Arg::EarlyDef;
+        else
+            role = Arg::Def;
+        
+        callback(inst.args[argIndex++], role, inst.origin->airType(), inst.origin->airWidth());
+    }
+
+    forEachArgImpl(0, argIndex, inst, SameAsRep, std::nullopt, callback);
+    argIndex += inst.origin->numChildren();
+
+    for (unsigned i = patchpoint->numGPScratchRegisters; i--;)
+        callback(inst.args[argIndex++], Arg::Scratch, Arg::GP, Arg::conservativeWidth(Arg::GP));
+    for (unsigned i = patchpoint->numFPScratchRegisters; i--;)
+        callback(inst.args[argIndex++], Arg::Scratch, Arg::FP, Arg::conservativeWidth(Arg::FP));
+}
+
+bool PatchpointSpecial::isValid(Inst& inst)
+{
+    PatchpointValue* patchpoint = inst.origin->as<PatchpointValue>();
+    unsigned argIndex = 1;
+
+    if (inst.origin->type() != Void) {
+        if (argIndex >= inst.args.size())
+            return false;
+        
+        if (!isArgValidForValue(inst.args[argIndex], patchpoint))
+            return false;
+        if (!isArgValidForRep(code(), inst.args[argIndex], patchpoint->resultConstraint))
+            return false;
+        argIndex++;
+    }
+
+    if (!isValidImpl(0, argIndex, inst))
+        return false;
+    argIndex += patchpoint->numChildren();
+
+    if (argIndex + patchpoint->numGPScratchRegisters + patchpoint->numFPScratchRegisters
+        != inst.args.size())
+        return false;
+
+    for (unsigned i = patchpoint->numGPScratchRegisters; i--;) {
+        Arg arg = inst.args[argIndex++];
+        if (!arg.isGPTmp())
+            return false;
+    }
+    for (unsigned i = patchpoint->numFPScratchRegisters; i--;) {
+        Arg arg = inst.args[argIndex++];
+        if (!arg.isFPTmp())
+            return false;
+    }
+
+    return true;
+}
+
+bool PatchpointSpecial::admitsStack(Inst& inst, unsigned argIndex)
+{
+    if (inst.origin->type() == Void)
+        return admitsStackImpl(0, 1, inst, argIndex);
+
+    if (argIndex == 1) {
+        switch (inst.origin->as<PatchpointValue>()->resultConstraint.kind()) {
+        case ValueRep::WarmAny:
+        case ValueRep::StackArgument:
+            return true;
+        case ValueRep::SomeRegister:
+        case ValueRep::SomeEarlyRegister:
+        case ValueRep::Register:
+        case ValueRep::LateRegister:
+            return false;
+        default:
+            RELEASE_ASSERT_NOT_REACHED();
+            return false;
+        }
+    }
+
+    return admitsStackImpl(0, 2, inst, argIndex);
+}
+
+CCallHelpers::Jump PatchpointSpecial::generate(
+    Inst& inst, CCallHelpers& jit, GenerationContext& context)
+{
+    PatchpointValue* value = inst.origin->as<PatchpointValue>();
+    ASSERT(value);
+
+    Vector<ValueRep> reps;
+    unsigned offset = 1;
+    if (inst.origin->type() != Void)
+        reps.append(repForArg(*context.code, inst.args[offset++]));
+    reps.appendVector(repsImpl(context, 0, offset, inst));
+    offset += value->numChildren();
+
+    StackmapGenerationParams params(value, reps, context);
+
+    for (unsigned i = value->numGPScratchRegisters; i--;)
+        params.m_gpScratch.append(inst.args[offset++].gpr());
+    for (unsigned i = value->numFPScratchRegisters; i--;)
+        params.m_fpScratch.append(inst.args[offset++].fpr());
+    
+    value->m_generator->run(jit, params);
+
+    return CCallHelpers::Jump();
+}
+
+bool PatchpointSpecial::isTerminal(Inst& inst)
+{
+    return inst.origin->as<PatchpointValue>()->effects.terminal;
+}
+
+void PatchpointSpecial::dumpImpl(PrintStream& out) const
+{
+    out.print("Patchpoint");
+}
+
+void PatchpointSpecial::deepDumpImpl(PrintStream& out) const
+{
+    out.print("Lowered B3::PatchpointValue.");
+}
+
+} } // namespace JSC::B3
+
+#endif // ENABLE(B3_JIT)