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9f929d1fcfd04398956742a8dead5976a13bd608
sdk/runtime/vm/compiler/stub_code_compiler_riscv.cc
T
Ryan Macnak 9f929d1fcf [vm] Get SP without using VM generated stubs. 
TEST=ci
Change-Id: Ie976408ff3cf5691a59081b7b405abe43d7adcc3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/493165
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
2026-04-07 08:06:43 -07:00

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// Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/globals.h"
// For `AllocateObjectInstr::WillAllocateNewOrRemembered`
// For `GenericCheckBoundInstr::UseUnboxedRepresentation`
#include "vm/compiler/backend/il.h"
#define SHOULD_NOT_INCLUDE_RUNTIME
#include "vm/compiler/stub_code_compiler.h"
#if defined(TARGET_ARCH_RISCV32) || defined(TARGET_ARCH_RISCV64)
#include "vm/class_id.h"
#include "vm/code_entry_kind.h"
#include "vm/compiler/api/type_check_mode.h"
#include "vm/compiler/assembler/assembler.h"
#include "vm/compiler/backend/locations.h"
#include "vm/constants.h"
#include "vm/ffi_callback_metadata.h"
#include "vm/instructions.h"
#include "vm/static_type_exactness_state.h"
#include "vm/tags.h"
#define __ assembler->
namespace dart {
namespace compiler {
// Ensures that [A0] is a new object, if not it will be added to the remembered
// set via a leaf runtime call.
//
// WARNING: This might clobber all registers except for [A0], [THR] and [FP].
// The caller should simply call LeaveStubFrame() and return.
void StubCodeCompiler::EnsureIsNewOrRemembered() {
// If the object is not in an active TLAB, we call a leaf-runtime to add it to
// the remembered set and/or deferred marking worklist. This test assumes a
// Page's TLAB use is always ascending.
Label done;
__ AndImmediate(TMP, A0, target::Page::kPageMask);
__ LoadFromOffset(TMP, TMP, target::Page::original_top_offset());
__ CompareRegisters(A0, TMP);
__ BranchIf(UNSIGNED_GREATER_EQUAL, &done);
{
LeafRuntimeScope rt(assembler, /*frame_size=*/0,
/*preserve_registers=*/false);
// A0 already loaded.
__ mv(A1, THR);
rt.Call(kEnsureRememberedAndMarkingDeferredRuntimeEntry,
/*argument_count=*/2);
}
__ Bind(&done);
}
// Input parameters:
// RA : return address.
// SP : address of last argument in argument array.
// SP + 8*T4 - 8 : address of first argument in argument array.
// SP + 8*T4 : address of return value.
// T5 : address of the runtime function to call.
// T4 : number of arguments to the call.
void StubCodeCompiler::GenerateCallToRuntimeStub() {
const intptr_t thread_offset = target::NativeArguments::thread_offset();
const intptr_t argc_tag_offset = target::NativeArguments::argc_tag_offset();
const intptr_t argv_offset = target::NativeArguments::argv_offset();
const intptr_t retval_offset = target::NativeArguments::retval_offset();
__ Comment("CallToRuntimeStub");
__ lx(CODE_REG, Address(THR, target::Thread::call_to_runtime_stub_offset()));
__ SetPrologueOffset();
__ EnterStubFrame();
// Save exit frame information to enable stack walking as we are about
// to transition to Dart VM C++ code.
__ StoreToOffset(FP, THR, target::Thread::top_exit_frame_info_offset());
// Mark that the thread exited generated code through a runtime call.
__ LoadImmediate(TMP, target::Thread::exit_through_runtime_call());
__ StoreToOffset(TMP, THR, target::Thread::exit_through_ffi_offset());
#if defined(DEBUG)
{
Label ok;
// Check that we are always entering from Dart code.
__ LoadFromOffset(TMP, THR, target::Thread::vm_tag_offset());
__ CompareImmediate(TMP, VMTag::kDartTagId);
__ BranchIf(EQ, &ok);
__ Stop("Not coming from Dart code.");
__ Bind(&ok);
}
#endif
// Mark that the thread is executing VM code.
__ StoreToOffset(T5, THR, target::Thread::vm_tag_offset());
// Reserve space for arguments and align frame before entering C++ world.
// target::NativeArguments are passed in registers.
__ Comment("align stack");
// Reserve space for arguments.
ASSERT(target::NativeArguments::StructSize() == 4 * target::kWordSize);
__ ReserveAlignedFrameSpace(target::NativeArguments::StructSize());
// Pass target::NativeArguments structure by value and call runtime.
// Registers R0, R1, R2, and R3 are used.
ASSERT(thread_offset == 0 * target::kWordSize);
ASSERT(argc_tag_offset == 1 * target::kWordSize);
ASSERT(argv_offset == 2 * target::kWordSize);
__ slli(T2, T4, target::kWordSizeLog2);
__ add(T2, FP, T2); // Compute argv.
// Set argv in target::NativeArguments.
__ AddImmediate(T2,
target::frame_layout.param_end_from_fp * target::kWordSize);
ASSERT(retval_offset == 3 * target::kWordSize);
__ AddImmediate(T3, T2, target::kWordSize);
__ StoreToOffset(THR, SP, thread_offset);
__ StoreToOffset(T4, SP, argc_tag_offset);
__ StoreToOffset(T2, SP, argv_offset);
__ StoreToOffset(T3, SP, retval_offset);
__ mv(A0, SP); // Pass the pointer to the target::NativeArguments.
ASSERT(IsAbiPreservedRegister(THR));
__ jalr(T5);
__ Comment("CallToRuntimeStub return");
// Refresh pinned registers values (inc. write barrier mask and null object).
__ RestorePinnedRegisters();
// Retval is next to 1st argument.
// Mark that the thread is executing Dart code.
__ LoadImmediate(TMP, VMTag::kDartTagId);
__ StoreToOffset(TMP, THR, target::Thread::vm_tag_offset());
// Mark that the thread has not exited generated Dart code.
__ StoreToOffset(ZR, THR, target::Thread::exit_through_ffi_offset());
// Reset exit frame information in Isolate's mutator thread structure.
__ StoreToOffset(ZR, THR, target::Thread::top_exit_frame_info_offset());
// Restore the global object pool after returning from runtime (old space is
// moving, so the GOP could have been relocated).
if (FLAG_precompiled_mode) {
__ SetupGlobalPoolAndDispatchTable();
}
__ LeaveStubFrame();
// The following return can jump to a lazy-deopt stub, which assumes A0
// contains a return value and will save it in a GC-visible way. We therefore
// have to ensure A0 does not contain any garbage value left from the C
// function we called (which has return type "void").
// (See GenerateDeoptimizationSequence::saved_result_slot_from_fp.)
__ LoadImmediate(A0, 0);
__ ret();
}
void StubCodeCompiler::GenerateSharedStubGeneric(
bool save_fpu_registers,
intptr_t self_code_stub_offset_from_thread,
bool allow_return,
std::function<void()> perform_runtime_call) {
// We want the saved registers to appear like part of the caller's frame, so
// we push them before calling EnterStubFrame.
RegisterSet all_registers;
all_registers.AddAllNonReservedRegisters(save_fpu_registers);
// To make the stack map calculation architecture independent we do the same
// as on intel.
__ PushRegister(RA);
__ PushRegisters(all_registers);
__ lx(CODE_REG, Address(THR, self_code_stub_offset_from_thread));
__ EnterStubFrame();
perform_runtime_call();
if (!allow_return) {
__ Breakpoint();
return;
}
__ LeaveStubFrame();
__ PopRegisters(all_registers);
__ Drop(1); // We use the RA restored via LeaveStubFrame.
__ ret();
}
void StubCodeCompiler::GenerateSharedStub(
bool save_fpu_registers,
const RuntimeEntry* target,
intptr_t self_code_stub_offset_from_thread,
bool allow_return,
bool store_runtime_result_in_result_register) {
ASSERT(!store_runtime_result_in_result_register || allow_return);
auto perform_runtime_call = [&]() {
if (store_runtime_result_in_result_register) {
__ PushRegister(NULL_REG);
}
__ CallRuntime(*target, /*argument_count=*/0);
if (store_runtime_result_in_result_register) {
__ PopRegister(A0);
__ sx(A0, Address(FP, target::kWordSize *
StubCodeCompiler::WordOffsetFromFpToCpuRegister(
SharedSlowPathStubABI::kResultReg)));
}
};
GenerateSharedStubGeneric(save_fpu_registers,
self_code_stub_offset_from_thread, allow_return,
perform_runtime_call);
}
void StubCodeCompiler::GenerateEnterSafepointStub() {
RegisterSet all_registers;
all_registers.AddAllGeneralRegisters();
__ PushRegisters(all_registers);
__ EnterFrame(0);
__ ReserveAlignedFrameSpace(0);
__ lx(TMP, Address(THR, kEnterSafepointRuntimeEntry.OffsetFromThread()));
__ jalr(TMP);
__ LeaveFrame();
__ PopRegisters(all_registers);
__ ret();
}
void StubCodeCompiler::GenerateExitSafepointStub() {
RegisterSet all_registers;
all_registers.AddAllGeneralRegisters();
__ PushRegisters(all_registers);
__ EnterFrame(0);
__ ReserveAlignedFrameSpace(0);
__ VerifyNotInGenerated(TMP);
__ lx(TMP, Address(THR, kExitSafepointRuntimeEntry.OffsetFromThread()));
__ jalr(TMP);
__ LeaveFrame();
__ PopRegisters(all_registers);
__ ret();
}
// Calls native code within a safepoint.
//
// On entry:
// T0: target to call
// Stack: set up for native call (SP), aligned, CSP < SP
//
// On exit:
// S3: clobbered, although normally callee-saved
// Stack: preserved, CSP == SP
void StubCodeCompiler::GenerateCallNativeThroughSafepointStub() {
COMPILE_ASSERT(IsAbiPreservedRegister(S3));
__ mv(S3, RA);
__ LoadImmediate(T1, target::Thread::exit_through_ffi());
__ TransitionGeneratedToNative(T0, FPREG, T1 /*volatile*/,
/*enter_safepoint=*/true);
#if defined(DEBUG)
// Check SP alignment.
__ andi(T2 /*volatile*/, SP, ~(OS::ActivationFrameAlignment() - 1));
Label done;
__ beq(T2, SP, &done);
__ Breakpoint();
__ Bind(&done);
#endif
__ jalr(T0);
__ TransitionNativeToGenerated(T1, /*exit_safepoint=*/true);
__ jr(S3);
}
void StubCodeCompiler::GenerateFfiCallTrampolineStub() {
__ Breakpoint(); // Not implemented.
}
void StubCodeCompiler::GenerateLoadBSSEntry(BSS::Relocation relocation,
Register dst,
Register tmp) {
compiler::Label skip_reloc;
__ j(&skip_reloc, compiler::Assembler::kNearJump);
InsertBSSRelocation(relocation);
__ Bind(&skip_reloc);
__ auipc(tmp, 0);
__ addi(tmp, tmp, -compiler::target::kWordSize);
// tmp holds the address of the relocation.
__ lx(dst, compiler::Address(tmp));
// dst holds the relocation itself: tmp - bss_start.
// tmp = tmp + (bss_start - tmp) = bss_start
__ add(tmp, tmp, dst);
// tmp holds the start of the BSS section.
// Load the "get-thread" routine: *bss_start.
__ lx(dst, compiler::Address(tmp));
}
void StubCodeCompiler::GenerateLoadFfiCallbackMetadataRuntimeFunction(
uword function_index,
Register dst) {
// Keep in sync with FfiCallbackMetadata::EnsureFirstTrampolinePageLocked.
// Note: If the stub was aligned, this could be a single PC relative load.
// Load a pointer to the beginning of the stub into dst.
const intptr_t code_size = __ CodeSize();
__ auipc(dst, 0);
__ AddImmediate(dst, -code_size);
// Round dst down to the page size.
__ AndImmediate(dst, FfiCallbackMetadata::kPageMask);
// Load the function from the function table.
__ LoadFromOffset(dst, dst,
FfiCallbackMetadata::RuntimeFunctionOffset(function_index));
}
static const RegisterSet kArgumentRegisterSet(
CallingConventions::kArgumentRegisters,
CallingConventions::kFpuArgumentRegisters);
static const RegisterSet kReturnRegisterSet(
(1 << CallingConventions::kReturnReg) |
(1 << CallingConventions::kSecondReturnReg),
(1 << CallingConventions::kReturnFpuReg) |
(1 << CallingConventions::kSecondReturnFpuReg));
void StubCodeCompiler::GenerateFfiCallbackTrampolineStub() {
#if defined(DART_INCLUDE_SIMULATOR) && !defined(DART_PRECOMPILER)
// TODO(37299): FFI is not supported in SIMRISCV32/64.
__ ebreak();
#else
Label body;
// T1 is volatile and not used for passing any arguments.
COMPILE_ASSERT(!IsCalleeSavedRegister(T1) && !IsArgumentRegister(T1));
for (intptr_t i = 0; i < FfiCallbackMetadata::NumCallbackTrampolinesPerPage();
++i) {
// The FfiCallbackMetadata table is keyed by the trampoline entry point. So
// look up the current PC, then jump to the shared section.
__ auipc(T1, 0);
__ j(&body);
}
ASSERT_EQUAL(__ CodeSize(),
FfiCallbackMetadata::kNativeCallbackTrampolineSize *
FfiCallbackMetadata::NumCallbackTrampolinesPerPage());
const intptr_t shared_stub_start = __ CodeSize();
__ Bind(&body);
COMPILE_ASSERT(FfiCallbackMetadata::kNativeCallbackTrampolineStackDelta == 4);
__ subi(SP, SP, 4 * target::kWordSize);
__ sx(RA, Address(SP, 3 * target::kWordSize));
__ sx(FP, Address(SP, 2 * target::kWordSize));
__ sx(THR, Address(SP, 1 * target::kWordSize));
__ sx(S2, Address(SP, 0 * target::kWordSize));
__ addi(FP, SP, 4 * target::kWordSize);
COMPILE_ASSERT(!IsArgumentRegister(THR));
// Load the thread, verify the callback ID and exit the safepoint.
//
// We exit the safepoint inside DLRT_GetFfiCallbackMetadata in order to save
// code size on this shared stub.
{
__ PushRegistersAligned(kArgumentRegisterSet, 3 * target::kWordSize);
__ mv(A0, T1);
__ mv(A1, SP);
// Since DLRT_GetFfiCallbackMetadata can theoretically be loaded anywhere,
// we use the same trick as before to ensure a predictable instruction
// sequence.
#if defined(DART_TARGET_OS_FUCHSIA)
// TODO(https://dartbug.com/52579): Remove.
if (FLAG_precompiled_mode) {
GenerateLoadBSSEntry(BSS::Relocation::DLRT_GetFfiCallbackMetadata, T1,
T2);
} else {
const intptr_t kPCRelativeLoadOffset = 12;
intptr_t start = __ CodeSize();
__ auipc(T1, 0);
__ lx(T1, Address(T1, kPCRelativeLoadOffset));
Label call;
__ j(&call);
ASSERT_EQUAL(__ CodeSize() - start, kPCRelativeLoadOffset);
#if XLEN == 32
__ Emit32(reinterpret_cast<int32_t>(&DLRT_GetFfiCallbackMetadata));
#else
__ Emit64(reinterpret_cast<int64_t>(&DLRT_GetFfiCallbackMetadata));
#endif
__ Bind(&call);
}
#else
GenerateLoadFfiCallbackMetadataRuntimeFunction(
FfiCallbackMetadata::kGetFfiCallbackMetadata, T1);
#endif // defined(DART_TARGET_OS_FUCHSIA)
__ jalr(T1);
__ mv(THR, A0);
__ lx(T2, Address(SP, 0 * target::kWordSize)); // entry_point
__ lx(T3, Address(SP, 1 * target::kWordSize)); // is_tail
__ lx(S2, Address(SP, 2 * target::kWordSize)); // epilogue
__ PopRegistersAligned(kArgumentRegisterSet, 3 * target::kWordSize);
}
Label tail;
__ bnez(T3, &tail, Assembler::kNearJump);
{
__ jalr(T2); // entry_point
__ PushRegistersAligned(kReturnRegisterSet, 0);
__ mv(A0, THR);
__ jalr(S2); // DLRT_ExitSyncCallback, etc
if (FLAG_target_memory_sanitizer) {
__ jalr(A0); // dart_msan_unpoison_retval
}
__ PopRegistersAligned(kReturnRegisterSet, 0);
__ lx(S2, Address(SP, 0 * target::kWordSize));
__ lx(THR, Address(SP, 1 * target::kWordSize));
__ lx(FP, Address(SP, 2 * target::kWordSize));
__ lx(RA, Address(SP, 3 * target::kWordSize));
__ addi(SP, SP, 4 * target::kWordSize);
__ ret();
}
{
__ Bind(&tail);
__ jalr(T2); // entry_point
__ mv(A0, THR);
__ mv(A1, S2);
__ lx(S2, Address(SP, 0 * target::kWordSize));
__ lx(THR, Address(SP, 1 * target::kWordSize));
__ lx(FP, Address(SP, 2 * target::kWordSize));
__ lx(RA, Address(SP, 3 * target::kWordSize));
__ addi(SP, SP, 4 * target::kWordSize);
// Tail-call DLRT_ExitTemporaryIsolate. It is not safe to return to this
// stub, since it might be deleted once DLRT_ExitTemporaryIsolate proceeds
// enough for VM shutdown.
__ jr(A1); // DLRT_ExitTemporaryIsolate.
__ ebreak();
}
ASSERT_LESS_OR_EQUAL(__ CodeSize() - shared_stub_start,
FfiCallbackMetadata::kNativeCallbackSharedStubSize);
ASSERT_LESS_OR_EQUAL(__ CodeSize(), FfiCallbackMetadata::kPageSize);
#if defined(DEBUG)
while (__ CodeSize() < FfiCallbackMetadata::kPageSize) {
__ ebreak();
}
#endif
#endif
}
void StubCodeCompiler::GenerateDispatchTableNullErrorStub() {
__ EnterStubFrame();
__ SmiTag(DispatchTableNullErrorABI::kClassIdReg);
__ PushRegister(DispatchTableNullErrorABI::kClassIdReg);
__ CallRuntime(kDispatchTableNullErrorRuntimeEntry, /*argument_count=*/1);
// The NullError runtime entry does not return.
__ Breakpoint();
}
void StubCodeCompiler::GenerateRangeError(bool with_fpu_regs) {
auto perform_runtime_call = [&]() {
// If the generated code has unboxed index/length we need to box them before
// calling the runtime entry.
#if XLEN == 32
ASSERT(!GenericCheckBoundInstr::UseUnboxedRepresentation());
#else
if (GenericCheckBoundInstr::UseUnboxedRepresentation()) {
Label length, smi_case;
// The user-controlled index might not fit into a Smi.
__ mv(TMP, RangeErrorABI::kIndexReg);
__ SmiTag(RangeErrorABI::kIndexReg, RangeErrorABI::kIndexReg);
__ SmiUntag(TMP2, RangeErrorABI::kIndexReg);
__ beq(TMP, TMP2, &length); // No overflow.
{
// Allocate a mint, reload the two registers and populate the mint.
__ PushRegister(NULL_REG);
__ CallRuntime(kAllocateMintRuntimeEntry, /*argument_count=*/0);
__ PopRegister(RangeErrorABI::kIndexReg);
__ lx(TMP,
Address(FP, target::kWordSize *
StubCodeCompiler::WordOffsetFromFpToCpuRegister(
RangeErrorABI::kIndexReg)));
__ sx(TMP, FieldAddress(RangeErrorABI::kIndexReg,
target::Mint::value_offset()));
__ lx(RangeErrorABI::kLengthReg,
Address(FP, target::kWordSize *
StubCodeCompiler::WordOffsetFromFpToCpuRegister(
RangeErrorABI::kLengthReg)));
}
// Length is guaranteed to be in positive Smi range (it comes from a load
// of a vm recognized array).
__ Bind(&length);
__ SmiTag(RangeErrorABI::kLengthReg);
}
#endif // XLEN != 32
__ PushRegistersInOrder(
{RangeErrorABI::kLengthReg, RangeErrorABI::kIndexReg});
__ CallRuntime(kRangeErrorRuntimeEntry, /*argument_count=*/2);
__ Breakpoint();
};
GenerateSharedStubGeneric(
/*save_fpu_registers=*/with_fpu_regs,
with_fpu_regs
? target::Thread::range_error_shared_with_fpu_regs_stub_offset()
: target::Thread::range_error_shared_without_fpu_regs_stub_offset(),
/*allow_return=*/false, perform_runtime_call);
}
void StubCodeCompiler::GenerateWriteError(bool with_fpu_regs) {
auto perform_runtime_call = [&]() {
__ CallRuntime(kWriteErrorRuntimeEntry, /*argument_count=*/2);
__ Breakpoint();
};
GenerateSharedStubGeneric(
/*save_fpu_registers=*/with_fpu_regs,
with_fpu_regs
? target::Thread::write_error_shared_with_fpu_regs_stub_offset()
: target::Thread::write_error_shared_without_fpu_regs_stub_offset(),
/*allow_return=*/false, perform_runtime_call);
}
// Input parameters:
// RA : return address.
// SP : address of return value.
// T5 : address of the native function to call.
// T2 : address of first argument in argument array.
// T1 : argc_tag including number of arguments and function kind.
static void GenerateCallNativeWithWrapperStub(Assembler* assembler,
Address wrapper) {
const intptr_t thread_offset = target::NativeArguments::thread_offset();
const intptr_t argc_tag_offset = target::NativeArguments::argc_tag_offset();
const intptr_t argv_offset = target::NativeArguments::argv_offset();
const intptr_t retval_offset = target::NativeArguments::retval_offset();
__ EnterStubFrame();
// Save exit frame information to enable stack walking as we are about
// to transition to native code.
__ StoreToOffset(FP, THR, target::Thread::top_exit_frame_info_offset());
// Mark that the thread exited generated code through a runtime call.
__ LoadImmediate(TMP, target::Thread::exit_through_runtime_call());
__ StoreToOffset(TMP, THR, target::Thread::exit_through_ffi_offset());
#if defined(DEBUG)
{
Label ok;
// Check that we are always entering from Dart code.
__ LoadFromOffset(TMP, THR, target::Thread::vm_tag_offset());
__ CompareImmediate(TMP, VMTag::kDartTagId);
__ BranchIf(EQ, &ok);
__ Stop("Not coming from Dart code.");
__ Bind(&ok);
}
#endif
// Mark that the thread is executing native code.
__ StoreToOffset(T5, THR, target::Thread::vm_tag_offset());
// Reserve space for the native arguments structure passed on the stack (the
// outgoing pointer parameter to the native arguments structure is passed in
// R0) and align frame before entering the C++ world.
__ ReserveAlignedFrameSpace(target::NativeArguments::StructSize());
// Initialize target::NativeArguments structure and call native function.
ASSERT(thread_offset == 0 * target::kWordSize);
ASSERT(argc_tag_offset == 1 * target::kWordSize);
// Set argc in target::NativeArguments: R1 already contains argc.
ASSERT(argv_offset == 2 * target::kWordSize);
// Set argv in target::NativeArguments: R2 already contains argv.
// Set retval in NativeArgs.
ASSERT(retval_offset == 3 * target::kWordSize);
__ AddImmediate(
T3, FP, (target::frame_layout.param_end_from_fp + 1) * target::kWordSize);
// Passing the structure by value as in runtime calls would require changing
// Dart API for native functions.
// For now, space is reserved on the stack and we pass a pointer to it.
__ StoreToOffset(THR, SP, thread_offset);
__ StoreToOffset(T1, SP, argc_tag_offset);
__ StoreToOffset(T2, SP, argv_offset);
__ StoreToOffset(T3, SP, retval_offset);
__ mv(A0, SP); // Pass the pointer to the target::NativeArguments.
__ mv(A1, T5); // Pass the function entrypoint to call.
// Call native function invocation wrapper or redirection via simulator.
ASSERT(IsAbiPreservedRegister(THR));
__ Call(wrapper);
// Refresh pinned registers values (inc. write barrier mask and null object).
__ RestorePinnedRegisters();
// Mark that the thread is executing Dart code.
__ LoadImmediate(TMP, VMTag::kDartTagId);
__ StoreToOffset(TMP, THR, target::Thread::vm_tag_offset());
// Mark that the thread has not exited generated Dart code.
__ StoreToOffset(ZR, THR, target::Thread::exit_through_ffi_offset());
// Reset exit frame information in Isolate's mutator thread structure.
__ StoreToOffset(ZR, THR, target::Thread::top_exit_frame_info_offset());
// Restore the global object pool after returning from runtime (old space is
// moving, so the GOP could have been relocated).
if (FLAG_precompiled_mode) {
__ SetupGlobalPoolAndDispatchTable();
}
__ LeaveStubFrame();
__ ret();
}
void StubCodeCompiler::GenerateCallNoScopeNativeStub() {
GenerateCallNativeWithWrapperStub(
assembler,
Address(THR,
target::Thread::no_scope_native_wrapper_entry_point_offset()));
}
void StubCodeCompiler::GenerateCallAutoScopeNativeStub() {
GenerateCallNativeWithWrapperStub(
assembler,
Address(THR,
target::Thread::auto_scope_native_wrapper_entry_point_offset()));
}
// Input parameters:
// RA : return address.
// SP : address of return value.
// R5 : address of the native function to call.
// R2 : address of first argument in argument array.
// R1 : argc_tag including number of arguments and function kind.
void StubCodeCompiler::GenerateCallBootstrapNativeStub() {
GenerateCallNativeWithWrapperStub(
assembler,
Address(THR,
target::Thread::bootstrap_native_wrapper_entry_point_offset()));
}
// Input parameters:
// ARGS_DESC_REG: arguments descriptor array.
void StubCodeCompiler::GenerateCallStaticFunctionStub() {
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ subi(SP, SP, 2 * target::kWordSize);
__ sx(ARGS_DESC_REG,
Address(SP, 1 * target::kWordSize)); // Preserve args descriptor.
__ sx(ZR, Address(SP, 0 * target::kWordSize)); // Result slot.
__ CallRuntime(kPatchStaticCallRuntimeEntry, 0);
__ lx(CODE_REG, Address(SP, 0 * target::kWordSize)); // Result.
__ lx(ARGS_DESC_REG,
Address(SP, 1 * target::kWordSize)); // Restore args descriptor.
__ addi(SP, SP, 2 * target::kWordSize);
__ LeaveStubFrame();
// Jump to the dart function.
__ LoadFieldFromOffset(TMP, CODE_REG, target::Code::entry_point_offset());
__ jr(TMP);
}
// Called from a static call only when an invalid code has been entered
// (invalid because its function was optimized or deoptimized).
// ARGS_DESC_REG: arguments descriptor array.
void StubCodeCompiler::GenerateFixCallersTargetStub() {
Label monomorphic;
__ BranchOnMonomorphicCheckedEntryJIT(&monomorphic);
// Load code pointer to this stub from the thread:
// The one that is passed in, is not correct - it points to the code object
// that needs to be replaced.
__ lx(CODE_REG,
Address(THR, target::Thread::fix_callers_target_code_offset()));
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
// Setup space on stack for return value and preserve arguments descriptor.
__ PushRegistersInOrder({ARGS_DESC_REG, ZR});
__ CallRuntime(kFixCallersTargetRuntimeEntry, 0);
// Get Code object result and restore arguments descriptor array.
__ PopRegister(CODE_REG);
__ PopRegister(ARGS_DESC_REG);
// Remove the stub frame.
__ LeaveStubFrame();
// Jump to the dart function.
__ LoadFieldFromOffset(TMP, CODE_REG, target::Code::entry_point_offset());
__ jr(TMP);
__ Bind(&monomorphic);
// Load code pointer to this stub from the thread:
// The one that is passed in, is not correct - it points to the code object
// that needs to be replaced.
__ lx(CODE_REG,
Address(THR, target::Thread::fix_callers_target_code_offset()));
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
// Setup result slot, preserve receiver and
// push old cache value (also 2nd return value).
__ PushRegistersInOrder({ZR, A0, S5});
__ CallRuntime(kFixCallersTargetMonomorphicRuntimeEntry, 2);
__ PopRegister(S5); // Get target cache object.
__ PopRegister(A0); // Restore receiver.
__ PopRegister(CODE_REG); // Get target Code object.
// Remove the stub frame.
__ LeaveStubFrame();
// Jump to the dart function.
__ LoadFieldFromOffset(
TMP, CODE_REG,
target::Code::entry_point_offset(CodeEntryKind::kMonomorphic));
__ jr(TMP);
}
// Called from object allocate instruction when the allocation stub has been
// disabled.
void StubCodeCompiler::GenerateFixAllocationStubTargetStub() {
// Load code pointer to this stub from the thread:
// The one that is passed in, is not correct - it points to the code object
// that needs to be replaced.
__ lx(CODE_REG,
Address(THR, target::Thread::fix_allocation_stub_code_offset()));
__ EnterStubFrame();
// Setup space on stack for return value.
__ PushRegister(ZR);
__ CallRuntime(kFixAllocationStubTargetRuntimeEntry, 0);
// Get Code object result.
__ PopRegister(CODE_REG);
// Remove the stub frame.
__ LeaveStubFrame();
// Jump to the dart function.
__ LoadFieldFromOffset(TMP, CODE_REG, target::Code::entry_point_offset());
__ jr(TMP);
}
// Called from object allocate instruction when the allocation stub for a
// generic class has been disabled.
void StubCodeCompiler::GenerateFixParameterizedAllocationStubTargetStub() {
// Load code pointer to this stub from the thread:
// The one that is passed in, is not correct - it points to the code object
// that needs to be replaced.
__ lx(CODE_REG,
Address(THR, target::Thread::fix_allocation_stub_code_offset()));
__ EnterStubFrame();
// Preserve type arguments register.
__ PushRegister(AllocateObjectABI::kTypeArgumentsReg);
// Setup space on stack for return value.
__ PushRegister(ZR);
__ CallRuntime(kFixAllocationStubTargetRuntimeEntry, 0);
// Get Code object result.
__ PopRegister(CODE_REG);
// Restore type arguments register.
__ PopRegister(AllocateObjectABI::kTypeArgumentsReg);
// Remove the stub frame.
__ LeaveStubFrame();
// Jump to the dart function.
__ LoadFieldFromOffset(TMP, CODE_REG, target::Code::entry_point_offset());
__ jr(TMP);
}
// Input parameters:
// T2: smi-tagged argument count, may be zero.
// FP[target::frame_layout.param_end_from_fp + 1]: last argument.
static void PushArrayOfArguments(Assembler* assembler) {
COMPILE_ASSERT(AllocateArrayABI::kLengthReg == T2);
COMPILE_ASSERT(AllocateArrayABI::kTypeArgumentsReg == T1);
// Allocate array to store arguments of caller.
__ LoadObject(T1, NullObject());
// T1: null element type for raw Array.
// T2: smi-tagged argument count, may be zero.
__ JumpAndLink(StubCodeAllocateArray());
// A0: newly allocated array.
// T2: smi-tagged argument count, may be zero (was preserved by the stub).
__ PushRegister(A0); // Array is in A0 and on top of stack.
__ SmiUntag(T2);
__ slli(T1, T2, target::kWordSizeLog2);
__ add(T1, T1, FP);
__ AddImmediate(T1,
target::frame_layout.param_end_from_fp * target::kWordSize);
__ AddImmediate(T3, A0, target::Array::data_offset() - kHeapObjectTag);
// T1: address of first argument on stack.
// T3: address of first argument in array.
Label loop, loop_exit;
__ Bind(&loop);
__ beqz(T2, &loop_exit);
__ lx(T6, Address(T1, 0));
__ addi(T1, T1, -target::kWordSize);
__ StoreCompressedIntoObject(A0, Address(T3, 0), T6);
__ addi(T3, T3, target::kCompressedWordSize);
__ addi(T2, T2, -1);
__ j(&loop);
__ Bind(&loop_exit);
}
// Used by eager and lazy deoptimization. Preserve result in RAX if necessary.
// This stub translates optimized frame into unoptimized frame. The optimized
// frame can contain values in registers and on stack, the unoptimized
// frame contains all values on stack.
// Deoptimization occurs in following steps:
// - Push all registers that can contain values.
// - Call C routine to copy the stack and saved registers into temporary buffer.
// - Adjust caller's frame to correct unoptimized frame size.
// - Fill the unoptimized frame.
// - Materialize objects that require allocation (e.g. Double instances).
// GC can occur only after frame is fully rewritten.
// Stack after TagAndPushPP() below:
// +------------------+
// | Saved PP | <- PP
// +------------------+
// | PC marker | <- TOS
// +------------------+
// | Saved FP |
// +------------------+
// | return-address | (deoptimization point)
// +------------------+
// | Saved CODE_REG | <- FP of stub
// +------------------+
// | ... | <- SP of optimized frame
//
// Parts of the code cannot GC, part of the code can GC.
static void GenerateDeoptimizationSequence(Assembler* assembler,
DeoptStubKind kind) {
// DeoptimizeCopyFrame expects a Dart frame, i.e. EnterDartFrame(0), but there
// is no need to set the correct PC marker or load PP, since they get patched.
__ EnterStubFrame();
// The code in this frame may not cause GC. kDeoptimizeCopyFrameRuntimeEntry
// and kDeoptimizeFillFrameRuntimeEntry are leaf runtime calls.
const intptr_t saved_result_slot_from_fp =
target::frame_layout.first_local_from_fp + 1 -
(kNumberOfCpuRegisters - A0);
const intptr_t saved_exception_slot_from_fp =
target::frame_layout.first_local_from_fp + 1 -
(kNumberOfCpuRegisters - A0);
const intptr_t saved_stacktrace_slot_from_fp =
target::frame_layout.first_local_from_fp + 1 -
(kNumberOfCpuRegisters - A1);
// Result in A0 is preserved as part of pushing all registers below.
// Push registers in their enumeration order: lowest register number at
// lowest address.
__ subi(SP, SP, kNumberOfCpuRegisters * target::kWordSize);
for (intptr_t i = kNumberOfCpuRegisters - 1; i >= 0; i--) {
const Register r = static_cast<Register>(i);
if (r == CODE_REG) {
// Save the original value of CODE_REG pushed before invoking this stub
// instead of the value used to call this stub.
COMPILE_ASSERT(TMP > CODE_REG); // TMP saved first
__ lx(TMP, Address(FP, 0 * target::kWordSize));
__ sx(TMP, Address(SP, i * target::kWordSize));
} else {
__ sx(r, Address(SP, i * target::kWordSize));
}
}
__ subi(SP, SP, kNumberOfFpuRegisters * kFpuRegisterSize);
for (intptr_t i = kNumberOfFpuRegisters - 1; i >= 0; i--) {
FRegister freg = static_cast<FRegister>(i);
__ fsd(freg, Address(SP, i * kFpuRegisterSize));
}
{
__ mv(A0, SP); // Pass address of saved registers block.
LeafRuntimeScope rt(assembler,
/*frame_size=*/0,
/*preserve_registers=*/false);
bool is_lazy =
(kind == kLazyDeoptFromReturn) || (kind == kLazyDeoptFromThrow);
__ li(A1, is_lazy ? 1 : 0);
rt.Call(kDeoptimizeCopyFrameRuntimeEntry, 2);
// Result (A0) is stack-size (FP - SP) in bytes.
}
if (kind == kLazyDeoptFromReturn) {
// Restore result into T1 temporarily.
__ LoadFromOffset(T1, FP, saved_result_slot_from_fp * target::kWordSize);
} else if (kind == kLazyDeoptFromThrow) {
// Restore result into T1 temporarily.
__ LoadFromOffset(T1, FP, saved_exception_slot_from_fp * target::kWordSize);
__ LoadFromOffset(T2, FP,
saved_stacktrace_slot_from_fp * target::kWordSize);
}
// There is a Dart Frame on the stack. We must restore PP and leave frame.
__ RestoreCodePointer();
__ LeaveStubFrame();
__ sub(SP, FP, A0);
// DeoptimizeFillFrame expects a Dart frame, i.e. EnterDartFrame(0), but there
// is no need to set the correct PC marker or load PP, since they get patched.
__ EnterStubFrame();
if (kind == kLazyDeoptFromReturn) {
__ PushRegister(T1); // Preserve result as first local.
} else if (kind == kLazyDeoptFromThrow) {
// Preserve exception as first local.
// Preserve stacktrace as second local.
__ PushRegistersInOrder({T1, T2});
}
{
__ mv(A0, FP); // Pass last FP as parameter in R0.
LeafRuntimeScope rt(assembler,
/*frame_size=*/0,
/*preserve_registers=*/false);
rt.Call(kDeoptimizeFillFrameRuntimeEntry, 1);
}
if (FLAG_target_thread_sanitizer) {
__ mv(CALLEE_SAVED_TEMP, A0); // Frames created
__ TsanFuncExit(/*preserve_registers=*/false); // Optimized frame.
Label loop;
__ Bind(&loop);
__ li(A0, 42);
__ TsanFuncEntry(/*preserve_registers=*/false); // Unoptimized frames.
__ subi(CALLEE_SAVED_TEMP, CALLEE_SAVED_TEMP, 1);
__ bnez(CALLEE_SAVED_TEMP, &loop);
}
if (kind == kLazyDeoptFromReturn) {
// Restore result into T1.
__ LoadFromOffset(
T1, FP, target::frame_layout.first_local_from_fp * target::kWordSize);
} else if (kind == kLazyDeoptFromThrow) {
// Restore result into T1.
__ LoadFromOffset(
T1, FP, target::frame_layout.first_local_from_fp * target::kWordSize);
__ LoadFromOffset(
T2, FP,
(target::frame_layout.first_local_from_fp - 1) * target::kWordSize);
}
// Code above cannot cause GC.
// There is a Dart Frame on the stack. We must restore PP and leave frame.
__ RestoreCodePointer();
__ LeaveStubFrame();
// Frame is fully rewritten at this point and it is safe to perform a GC.
// Materialize any objects that were deferred by FillFrame because they
// require allocation.
// Enter stub frame with loading PP. The caller's PP is not materialized yet.
__ EnterStubFrame();
if (kind == kLazyDeoptFromReturn) {
__ PushRegister(T1); // Preserve result, it will be GC-d here.
} else if (kind == kLazyDeoptFromThrow) {
// Preserve CODE_REG for one more runtime call.
__ PushRegister(CODE_REG);
// Preserve exception, it will be GC-d here.
// Preserve stacktrace, it will be GC-d here.
__ PushRegistersInOrder({T1, T2});
}
__ PushRegister(ZR); // Space for the result.
__ CallRuntime(kDeoptimizeMaterializeRuntimeEntry, 0);
// Result tells stub how many bytes to remove from the expression stack
// of the bottom-most frame. They were used as materialization arguments.
__ PopRegister(T2);
__ SmiUntag(T2);
if (kind == kLazyDeoptFromReturn) {
__ PopRegister(A0); // Restore result.
} else if (kind == kLazyDeoptFromThrow) {
__ PopRegister(A1); // Restore stacktrace.
__ PopRegister(A0); // Restore exception.
__ PopRegister(CODE_REG);
}
__ LeaveStubFrame();
// Remove materialization arguments.
__ add(SP, SP, T2);
// The caller is responsible for emitting the return instruction.
if (kind == kLazyDeoptFromThrow) {
// Unoptimized frame is now ready to accept the exception. Rethrow it to
// find the right handler. Ask rethrow machinery to bypass debugger it
// was already notified about this exception.
__ EnterStubFrame();
__ PushRegister(ZR); // Space for the result value (unused)
__ PushRegister(A0); // Exception
__ PushRegister(A1); // Stacktrace
__ PushImmediate(target::ToRawSmi(1)); // Bypass debugger.
__ CallRuntime(kReThrowRuntimeEntry, 3);
__ LeaveStubFrame();
}
}
// A0: result, must be preserved
void StubCodeCompiler::GenerateDeoptimizeLazyFromReturnStub() {
// Push zap value instead of CODE_REG for lazy deopt.
__ LoadImmediate(TMP, kZapCodeReg);
__ PushRegister(TMP);
// Return address for "call" to deopt stub.
__ LoadImmediate(RA, kZapReturnAddress);
__ lx(CODE_REG,
Address(THR, target::Thread::lazy_deopt_from_return_stub_offset()));
GenerateDeoptimizationSequence(assembler, kLazyDeoptFromReturn);
__ ret();
}
// A0: exception, must be preserved
// A1: stacktrace, must be preserved
void StubCodeCompiler::GenerateDeoptimizeLazyFromThrowStub() {
// Push zap value instead of CODE_REG for lazy deopt.
__ LoadImmediate(TMP, kZapCodeReg);
__ PushRegister(TMP);
// Return address for "call" to deopt stub.
__ LoadImmediate(RA, kZapReturnAddress);
__ lx(CODE_REG,
Address(THR, target::Thread::lazy_deopt_from_throw_stub_offset()));
GenerateDeoptimizationSequence(assembler, kLazyDeoptFromThrow);
__ ret();
}
void StubCodeCompiler::GenerateDeoptimizeStub() {
__ PushRegister(CODE_REG);
__ lx(CODE_REG, Address(THR, target::Thread::deoptimize_stub_offset()));
GenerateDeoptimizationSequence(assembler, kEagerDeopt);
__ ret();
}
// IC_DATA_REG: ICData/MegamorphicCache
static void GenerateNoSuchMethodDispatcherBody(Assembler* assembler) {
__ EnterStubFrame();
__ lx(ARGS_DESC_REG,
FieldAddress(IC_DATA_REG,
target::CallSiteData::arguments_descriptor_offset()));
// Load the receiver.
__ LoadCompressedSmiFieldFromOffset(
T2, ARGS_DESC_REG, target::ArgumentsDescriptor::size_offset());
__ AddShifted(TMP, FP, T2, target::kWordSizeLog2 - 1); // T2 is Smi.
__ LoadFromOffset(A0, TMP,
target::frame_layout.param_end_from_fp * target::kWordSize);
// Push: result slot, receiver, ICData/MegamorphicCache,
// arguments descriptor.
__ PushRegistersInOrder({ZR, A0, IC_DATA_REG, ARGS_DESC_REG});
// Adjust arguments count.
__ LoadCompressedSmiFieldFromOffset(
T3, ARGS_DESC_REG, target::ArgumentsDescriptor::type_args_len_offset());
Label args_count_ok;
__ beqz(T3, &args_count_ok, Assembler::kNearJump);
// Include the type arguments.
__ addi(T2, T2, target::ToRawSmi(1));
__ Bind(&args_count_ok);
// T2: Smi-tagged arguments array length.
PushArrayOfArguments(assembler);
const intptr_t kNumArgs = 4;
__ CallRuntime(kNoSuchMethodFromCallStubRuntimeEntry, kNumArgs);
__ Drop(4);
__ PopRegister(A0); // Return value.
__ LeaveStubFrame();
__ ret();
}
static void GenerateDispatcherCode(Assembler* assembler,
Label* call_target_function) {
__ Comment("NoSuchMethodDispatch");
// When lazily generated invocation dispatchers are disabled, the
// miss-handler may return null.
__ bne(T0, NULL_REG, call_target_function);
GenerateNoSuchMethodDispatcherBody(assembler);
}
// Input:
// ARGS_DESC_REG - arguments descriptor
// IC_DATA_REG - icdata/megamorphic_cache
void StubCodeCompiler::GenerateNoSuchMethodDispatcherStub() {
GenerateNoSuchMethodDispatcherBody(assembler);
}
// Called for inline allocation of arrays.
// Input registers (preserved):
// RA: return address.
// AllocateArrayABI::kLengthReg: array length as Smi.
// AllocateArrayABI::kTypeArgumentsReg: type arguments of array.
// Output registers:
// AllocateArrayABI::kResultReg: newly allocated array.
// Clobbered:
// T3, T4, T5
void StubCodeCompiler::GenerateAllocateArrayStub() {
if (!FLAG_use_slow_path && FLAG_inline_alloc) {
Label slow_case;
// Compute the size to be allocated, it is based on the array length
// and is computed as:
// RoundedAllocationSize(
// (array_length * kCompressedWordSize) + target::Array::header_size()).
// Check that length is a Smi.
__ BranchIfNotSmi(AllocateArrayABI::kLengthReg, &slow_case);
// Check length >= 0 && length <= kMaxNewSpaceElements
const intptr_t max_len =
target::ToRawSmi(target::Array::kMaxNewSpaceElements);
__ CompareImmediate(AllocateArrayABI::kLengthReg, max_len, kObjectBytes);
__ BranchIf(HI, &slow_case);
const intptr_t cid = kArrayCid;
NOT_IN_PRODUCT(__ MaybeTraceAllocation(kArrayCid, &slow_case, T4));
// Calculate and align allocation size.
// Load new object start and calculate next object start.
// AllocateArrayABI::kTypeArgumentsReg: type arguments of array.
// AllocateArrayABI::kLengthReg: array length as Smi.
__ lx(AllocateArrayABI::kResultReg,
Address(THR, target::Thread::top_offset()));
intptr_t fixed_size_plus_alignment_padding =
target::Array::header_size() +
target::ObjectAlignment::kObjectAlignment - 1;
// AllocateArrayABI::kLengthReg is Smi.
__ slli(T3, AllocateArrayABI::kLengthReg,
target::kWordSizeLog2 - kSmiTagSize);
__ AddImmediate(T3, fixed_size_plus_alignment_padding);
__ andi(T3, T3, ~(target::ObjectAlignment::kObjectAlignment - 1));
// AllocateArrayABI::kResultReg: potential new object start.
// T3: object size in bytes.
__ add(T4, AllocateArrayABI::kResultReg, T3);
// Branch if unsigned overflow.
__ bltu(T4, AllocateArrayABI::kResultReg, &slow_case);
// Check if the allocation fits into the remaining space.
// AllocateArrayABI::kResultReg: potential new object start.
// AllocateArrayABI::kTypeArgumentsReg: type arguments of array.
// AllocateArrayABI::kLengthReg: array length as Smi.
// T3: array size.
// T4: potential next object start.
__ LoadFromOffset(TMP, THR, target::Thread::end_offset());
__ bgeu(T4, TMP, &slow_case); // Branch if unsigned higher or equal.
__ CheckAllocationCanary(AllocateArrayABI::kResultReg);
// Successfully allocated the object(s), now update top to point to
// next object start and initialize the object.
// AllocateArrayABI::kResultReg: potential new object start.
// T3: array size.
// T4: potential next object start.
__ sx(T4, Address(THR, target::Thread::top_offset()));
__ addi(AllocateArrayABI::kResultReg, AllocateArrayABI::kResultReg,
kHeapObjectTag);
// AllocateArrayABI::kResultReg: new object start as a tagged pointer.
// AllocateArrayABI::kTypeArgumentsReg: type arguments of array.
// AllocateArrayABI::kLengthReg: array length as Smi.
// R3: array size.
// R7: new object end address.
// Calculate the size tag.
// AllocateArrayABI::kResultReg: new object start as a tagged pointer.
// AllocateArrayABI::kLengthReg: array length as Smi.
// T3: array size.
// T4: new object end address.
const intptr_t shift = target::UntaggedObject::kSizeTagPos -
target::ObjectAlignment::kObjectAlignmentLog2;
__ li(T5, 0);
__ CompareImmediate(T3, target::UntaggedObject::kSizeTagMaxSizeTag);
compiler::Label zero_tag;
__ BranchIf(UNSIGNED_GREATER, &zero_tag);
__ slli(T5, T3, shift);
__ Bind(&zero_tag);
// Get the class index and insert it into the tags.
const uword tags =
target::MakeTagWordForNewSpaceObject(cid, /*instance_size=*/0);
__ OrImmediate(T5, T5, tags);
__ InitializeHeader(T5, AllocateArrayABI::kResultReg);
// Store the type argument field.
__ StoreCompressedIntoObjectOffsetNoBarrier(
AllocateArrayABI::kResultReg, target::Array::type_arguments_offset(),
AllocateArrayABI::kTypeArgumentsReg);
// Set the length field.
__ StoreCompressedIntoObjectOffsetNoBarrier(AllocateArrayABI::kResultReg,
target::Array::length_offset(),
AllocateArrayABI::kLengthReg);
// Initialize all array elements to raw_null.
// AllocateArrayABI::kResultReg: new object start as a tagged pointer.
// R7: new object end address.
// AllocateArrayABI::kLengthReg: array length as Smi.
__ AddImmediate(T3, AllocateArrayABI::kResultReg,
target::Array::data_offset() - kHeapObjectTag);
// R3: iterator which initially points to the start of the variable
// data area to be initialized.
if (__ Supports(RV_V)) {
Register remaining_length = TMP;
Register vl = TMP2;
__ SmiUntag(remaining_length, AllocateArrayABI::kLengthReg);
Label loop;
__ Bind(&loop);
#if XLEN == 32
__ vsetvli(vl, remaining_length, e32, m8, ta, ma);
__ vmvvx(V0, NULL_REG);
__ vse32v(V0, Address(T3));
#else
__ vsetvli(vl, remaining_length, e64, m8, ta, ma);
__ vmvvx(V0, NULL_REG);
__ vse64v(V0, Address(T3));
#endif
__ sub(remaining_length, remaining_length, vl);
__ AddShifted(T3, T3, vl, target::kWordSizeLog2); // Bump dest.
__ bnez(remaining_length, &loop);
} else {
Label loop;
__ Bind(&loop);
for (intptr_t offset = 0; offset < target::kObjectAlignment;
offset += target::kCompressedWordSize) {
__ StoreCompressedIntoObjectNoBarrier(AllocateArrayABI::kResultReg,
Address(T3, offset), NULL_REG);
}
// Safe to only check every kObjectAlignment bytes instead of each word.
ASSERT(kAllocationRedZoneSize >= target::kObjectAlignment);
__ addi(T3, T3, target::kObjectAlignment);
__ bltu(T3, T4, &loop);
__ WriteAllocationCanary(T4); // Fix overshoot.
}
// Done allocating and initializing the array.
// AllocateArrayABI::kResultReg: new object.
// AllocateArrayABI::kLengthReg: array length as Smi (preserved).
__ ret();
// Unable to allocate the array using the fast inline code, just call
// into the runtime.
__ Bind(&slow_case);
}
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ subi(SP, SP, 3 * target::kWordSize);
__ sx(ZR, Address(SP, 2 * target::kWordSize)); // Result slot.
__ sx(AllocateArrayABI::kLengthReg, Address(SP, 1 * target::kWordSize));
__ sx(AllocateArrayABI::kTypeArgumentsReg,
Address(SP, 0 * target::kWordSize));
__ CallRuntime(kAllocateArrayRuntimeEntry, 2);
// Write-barrier elimination might be enabled for this array (depending on the
// array length). To be sure we will check if the allocated object is in old
// space and if so call a leaf runtime to add it to the remembered set.
ASSERT(AllocateArrayABI::kResultReg == A0);
__ lx(AllocateArrayABI::kResultReg, Address(SP, 2 * target::kWordSize));
EnsureIsNewOrRemembered();
__ lx(AllocateArrayABI::kTypeArgumentsReg,
Address(SP, 0 * target::kWordSize));
__ lx(AllocateArrayABI::kLengthReg, Address(SP, 1 * target::kWordSize));
__ lx(AllocateArrayABI::kResultReg, Address(SP, 2 * target::kWordSize));
__ addi(SP, SP, 3 * target::kWordSize);
__ LeaveStubFrame();
__ ret();
}
void StubCodeCompiler::GenerateAllocateMintSharedWithFPURegsStub() {
// For test purpose call allocation stub without inline allocation attempt.
if (!FLAG_use_slow_path && FLAG_inline_alloc) {
Label slow_case;
__ TryAllocate(compiler::MintClass(), &slow_case, Assembler::kNearJump,
AllocateMintABI::kResultReg, AllocateMintABI::kTempReg);
__ ret();
__ Bind(&slow_case);
}
COMPILE_ASSERT(AllocateMintABI::kResultReg ==
SharedSlowPathStubABI::kResultReg);
GenerateSharedStub(/*save_fpu_registers=*/true, &kAllocateMintRuntimeEntry,
target::Thread::allocate_mint_with_fpu_regs_stub_offset(),
/*allow_return=*/true,
/*store_runtime_result_in_result_register=*/true);
}
void StubCodeCompiler::GenerateAllocateMintSharedWithoutFPURegsStub() {
// For test purpose call allocation stub without inline allocation attempt.
if (!FLAG_use_slow_path && FLAG_inline_alloc) {
Label slow_case;
__ TryAllocate(compiler::MintClass(), &slow_case, Assembler::kNearJump,
AllocateMintABI::kResultReg, AllocateMintABI::kTempReg);
__ ret();
__ Bind(&slow_case);
}
COMPILE_ASSERT(AllocateMintABI::kResultReg ==
SharedSlowPathStubABI::kResultReg);
GenerateSharedStub(
/*save_fpu_registers=*/false, &kAllocateMintRuntimeEntry,
target::Thread::allocate_mint_without_fpu_regs_stub_offset(),
/*allow_return=*/true,
/*store_runtime_result_in_result_register=*/true);
}
// Called when invoking Dart code from C++ (VM code).
// Input parameters:
// RA : points to return address.
// A0 : target code or entry point (in AOT mode).
// A1 : arguments descriptor array.
// A2 : arguments array.
// A3 : current thread.
// Beware! TMP == A3
void StubCodeCompiler::GenerateInvokeDartCodeStub() {
__ Comment("InvokeDartCodeStub");
__ EnterFrame(1 * target::kWordSize);
// Push code object to PC marker slot.
__ lx(TMP2, Address(A3, target::Thread::invoke_dart_code_stub_offset()));
__ sx(TMP2, Address(SP, 0 * target::kWordSize));
#if defined(DART_TARGET_OS_FUCHSIA) || defined(DART_TARGET_OS_ANDROID)
__ sx(GP, Address(A3, target::Thread::saved_shadow_call_stack_offset()));
// TODO(riscv): Enable once Fuchsia/Android have Zimop in their baseline.
// __ ssrdp(TMP);
// __ sx(TMP, Address(A3, target::Thread::saved_ss_offset()));
#elif defined(USING_SHADOW_CALL_STACK)
#error Unimplemented
#endif
// TODO(riscv): Consider using only volatile FPU registers in Dart code so we
// don't need to save the preserved FPU registers here.
__ PushNativeCalleeSavedRegisters();
// Set up THR, which caches the current thread in Dart code.
if (THR != A3) {
__ mv(THR, A3);
}
// Refresh pinned registers values (inc. write barrier mask and null object).
__ RestorePinnedRegisters();
// Save the current VMTag, top resource and top exit frame info on the stack.
// StackFrameIterator reads the top exit frame info saved in this frame.
__ subi(SP, SP, 4 * target::kWordSize);
__ lx(TMP, Address(THR, target::Thread::vm_tag_offset()));
__ sx(TMP, Address(SP, 3 * target::kWordSize));
__ lx(TMP, Address(THR, target::Thread::top_resource_offset()));
__ sx(ZR, Address(THR, target::Thread::top_resource_offset()));
__ sx(TMP, Address(SP, 2 * target::kWordSize));
__ lx(TMP, Address(THR, target::Thread::exit_through_ffi_offset()));
__ sx(ZR, Address(THR, target::Thread::exit_through_ffi_offset()));
__ sx(TMP, Address(SP, 1 * target::kWordSize));
__ lx(TMP, Address(THR, target::Thread::top_exit_frame_info_offset()));
__ sx(ZR, Address(THR, target::Thread::top_exit_frame_info_offset()));
__ sx(TMP, Address(SP, 0 * target::kWordSize));
// target::frame_layout.exit_link_slot_from_entry_fp must be kept in sync
// with the code below.
#if XLEN == 32
ASSERT_EQUAL(target::frame_layout.exit_link_slot_from_entry_fp, -42);
#elif XLEN == 64
ASSERT_EQUAL(target::frame_layout.exit_link_slot_from_entry_fp, -30);
#endif
// In debug mode, verify that we've pushed the top exit frame info at the
// correct offset from FP.
__ EmitEntryFrameVerification();
// Mark that the thread is executing Dart code. Do this after initializing the
// exit link for the profiler.
__ LoadImmediate(TMP, VMTag::kDartTagId);
__ StoreToOffset(TMP, THR, target::Thread::vm_tag_offset());
// Load arguments descriptor array, which is passed to Dart code.
__ mv(ARGS_DESC_REG, A1);
// Load number of arguments into T5 and adjust count for type arguments.
__ LoadFieldFromOffset(T5, ARGS_DESC_REG,
target::ArgumentsDescriptor::count_offset());
__ LoadFieldFromOffset(T3, ARGS_DESC_REG,
target::ArgumentsDescriptor::type_args_len_offset());
__ SmiUntag(T5);
// Include the type arguments.
__ snez(T3, T3); // T3 <- T3 == 0 ? 0 : 1
__ add(T5, T5, T3);
// Compute address of 'arguments array' data area into A2.
__ AddImmediate(A2, A2, target::Array::data_offset() - kHeapObjectTag);
// Set up arguments for the Dart call.
Label push_arguments;
Label done_push_arguments;
__ beqz(T5, &done_push_arguments); // check if there are arguments.
__ LoadImmediate(T2, 0);
__ Bind(&push_arguments);
__ lx(T3, Address(A2, 0));
__ PushRegister(T3);
__ addi(T2, T2, 1);
__ addi(A2, A2, target::kWordSize);
__ blt(T2, T5, &push_arguments, compiler::Assembler::kNearJump);
__ Bind(&done_push_arguments);
if (FLAG_precompiled_mode) {
__ SetupGlobalPoolAndDispatchTable();
__ mv(CODE_REG, ZR); // GC-safe value into CODE_REG.
} else {
// We now load the pool pointer(PP) with a GC safe value as we are about to
// invoke dart code. We don't need a real object pool here.
__ li(PP, 1); // PP is untagged, callee will tag and spill PP.
__ mv(CODE_REG, A0);
__ lx(A0, FieldAddress(CODE_REG, target::Code::entry_point_offset()));
}
// Call the Dart code entrypoint.
__ jalr(A0); // ARGS_DESC_REG is the arguments descriptor array.
__ Comment("InvokeDartCodeStub return");
// Get rid of arguments pushed on the stack.
__ addi(
SP, FP,
target::frame_layout.exit_link_slot_from_entry_fp * target::kWordSize);
// Restore the current VMTag, the saved top exit frame info and top resource
// back into the Thread structure.
__ lx(TMP, Address(SP, 0 * target::kWordSize));
__ sx(TMP, Address(THR, target::Thread::top_exit_frame_info_offset()));
__ lx(TMP, Address(SP, 1 * target::kWordSize));
__ sx(TMP, Address(THR, target::Thread::exit_through_ffi_offset()));
__ lx(TMP, Address(SP, 2 * target::kWordSize));
__ sx(TMP, Address(THR, target::Thread::top_resource_offset()));
__ lx(TMP, Address(SP, 3 * target::kWordSize));
__ sx(TMP, Address(THR, target::Thread::vm_tag_offset()));
__ addi(SP, SP, 4 * target::kWordSize);
__ PopNativeCalleeSavedRegisters();
// Restore the frame pointer and C stack pointer and return.
__ LeaveFrame();
__ ret();
}
// Called when invoking compiled Dart code from interpreted Dart code.
// Input parameters:
// RSP : points to return address.
// RDI : target code or entry point (in AOT mode).
// RSI : arguments descriptor array.
// RDX : address of first argument.
// RCX : current thread.
void StubCodeCompiler::GenerateInvokeDartCodeFromBytecodeStub() {
__ Stop("Not implemented on RISC-V.");
}
// Helper to generate space allocation of context stub.
// This does not initialise the fields of the context.
// Input:
// T1: number of context variables.
// Output:
// A0: new allocated Context object.
// Clobbered:
// T2, T3, T4, TMP
static void GenerateAllocateContextSpaceStub(Assembler* assembler,
Label* slow_case) {
// First compute the rounded instance size.
// R1: number of context variables.
intptr_t fixed_size_plus_alignment_padding =
target::Context::header_size() +
target::ObjectAlignment::kObjectAlignment - 1;
__ slli(T2, T1, kCompressedWordSizeLog2);
__ AddImmediate(T2, fixed_size_plus_alignment_padding);
__ andi(T2, T2, ~(target::ObjectAlignment::kObjectAlignment - 1));
NOT_IN_PRODUCT(__ MaybeTraceAllocation(kContextCid, slow_case, T4));
// Now allocate the object.
// T1: number of context variables.
// T2: object size.
__ lx(A0, Address(THR, target::Thread::top_offset()));
__ add(T3, T2, A0);
// Check if the allocation fits into the remaining space.
// A0: potential new object.
// T1: number of context variables.
// T2: object size.
// T3: potential next object start.
__ lx(TMP, Address(THR, target::Thread::end_offset()));
__ CompareRegisters(T3, TMP);
__ BranchIf(CS, slow_case); // Branch if unsigned higher or equal.
__ CheckAllocationCanary(A0);
// Successfully allocated the object, now update top to point to
// next object start and initialize the object.
// A0: new object.
// T1: number of context variables.
// T2: object size.
// T3: next object start.
__ sx(T3, Address(THR, target::Thread::top_offset()));
__ addi(A0, A0, kHeapObjectTag);
// Calculate the size tag.
// A0: new object.
// T1: number of context variables.
// T2: object size.
const intptr_t shift = target::UntaggedObject::kSizeTagPos -
target::ObjectAlignment::kObjectAlignmentLog2;
__ li(T3, 0);
__ CompareImmediate(T2, target::UntaggedObject::kSizeTagMaxSizeTag);
// If no size tag overflow, shift R2 left, else set R2 to zero.
compiler::Label zero_tag;
__ BranchIf(HI, &zero_tag);
__ slli(T3, T2, shift);
__ Bind(&zero_tag);
// Get the class index and insert it into the tags.
// T3: size and bit tags.
const uword tags =
target::MakeTagWordForNewSpaceObject(kContextCid, /*instance_size=*/0);
__ OrImmediate(T3, T3, tags);
__ InitializeHeader(T3, A0);
// Setup up number of context variables field.
// A0: new object.
// T1: number of context variables as integer value (not object).
__ StoreFieldToOffset(T1, A0, target::Context::num_variables_offset(),
kFourBytes);
}
// Called for inline allocation of contexts.
// Input:
// T1: number of context variables.
// Output:
// A0: new allocated Context object.
void StubCodeCompiler::GenerateAllocateContextStub() {
if (!FLAG_use_slow_path && FLAG_inline_alloc) {
Label slow_case;
GenerateAllocateContextSpaceStub(assembler, &slow_case);
// Setup the parent field.
// A0: new object.
// T1: number of context variables.
__ StoreCompressedIntoObjectOffset(A0, target::Context::parent_offset(),
NULL_REG);
// Initialize the context variables.
// A0: new object.
// T1: number of context variables.
__ AddImmediate(T3, A0,
target::Context::variable_offset(0) - kHeapObjectTag);
if (__ Supports(RV_V)) {
Register vl = TMP2;
Label loop;
__ Bind(&loop);
#if XLEN == 32
__ vsetvli(vl, T1, e32, m8, ta, ma);
__ vmvvx(V0, NULL_REG);
__ vse32v(V0, Address(T3));
#else
__ vsetvli(vl, T1, e64, m8, ta, ma);
__ vmvvx(V0, NULL_REG);
__ vse64v(V0, Address(T3));
#endif
__ sub(T1, T1, vl); // Remaining elements.
__ AddShifted(T3, T3, vl, target::kWordSizeLog2); // Bump dest.
__ bnez(T1, &loop);
} else {
Label loop, done;
__ Bind(&loop);
__ subi(T1, T1, 1);
__ bltz(T1, &done);
__ sx(NULL_REG, Address(T3, 0));
__ addi(T3, T3, target::kCompressedWordSize);
__ j(&loop);
__ Bind(&done);
}
// Done allocating and initializing the context.
// A0: new object.
__ ret();
__ Bind(&slow_case);
}
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
// Setup space on stack for return value.
__ SmiTag(T1);
__ PushObject(NullObject());
__ PushRegister(T1);
__ CallRuntime(kAllocateContextRuntimeEntry, 1); // Allocate context.
__ Drop(1); // Pop number of context variables argument.
__ PopRegister(A0); // Pop the new context object.
// Write-barrier elimination might be enabled for this context (depending on
// the size). To be sure we will check if the allocated object is in old
// space and if so call a leaf runtime to add it to the remembered set.
EnsureIsNewOrRemembered();
// A0: new object
// Restore the frame pointer.
__ LeaveStubFrame();
__ ret();
}
// Called for clone of contexts.
// Input:
// T5: context variable to clone.
// Output:
// A0: new allocated Context object.
void StubCodeCompiler::GenerateCloneContextStub() {
if (!FLAG_use_slow_path && FLAG_inline_alloc) {
Label slow_case;
// Load num. variable (int32) in the existing context.
__ lw(T1, FieldAddress(T5, target::Context::num_variables_offset()));
GenerateAllocateContextSpaceStub(assembler, &slow_case);
// Load parent in the existing context.
__ LoadCompressed(T3, FieldAddress(T5, target::Context::parent_offset()));
// Setup the parent field.
// A0: new context.
__ StoreCompressedIntoObjectNoBarrier(
A0, FieldAddress(A0, target::Context::parent_offset()), T3);
// Clone the context variables.
// A0: new context.
// T1: number of context variables.
{
Label loop, done;
// T3: Variable array address, new context.
__ AddImmediate(T3, A0,
target::Context::variable_offset(0) - kHeapObjectTag);
// T4: Variable array address, old context.
__ AddImmediate(T4, T5,
target::Context::variable_offset(0) - kHeapObjectTag);
__ Bind(&loop);
__ subi(T1, T1, 1);
__ bltz(T1, &done);
__ lx(T5, Address(T4, 0));
__ addi(T4, T4, target::kCompressedWordSize);
__ sx(T5, Address(T3, 0));
__ addi(T3, T3, target::kCompressedWordSize);
__ j(&loop);
__ Bind(&done);
}
// Done allocating and initializing the context.
// A0: new object.
__ ret();
__ Bind(&slow_case);
}
__ EnterStubFrame();
__ subi(SP, SP, 2 * target::kWordSize);
__ sx(NULL_REG, Address(SP, 1 * target::kWordSize)); // Result slot.
__ sx(T5, Address(SP, 0 * target::kWordSize)); // Context argument.
__ CallRuntime(kCloneContextRuntimeEntry, 1);
__ lx(A0, Address(SP, 1 * target::kWordSize)); // Context result.
__ subi(SP, SP, 2 * target::kWordSize);
// Write-barrier elimination might be enabled for this context (depending on
// the size). To be sure we will check if the allocated object is in old
// space and if so call a leaf runtime to add it to the remembered set.
EnsureIsNewOrRemembered();
// A0: new object
__ LeaveStubFrame();
__ ret();
}
void StubCodeCompiler::GenerateWriteBarrierWrappersStub() {
for (intptr_t i = 0; i < kNumberOfCpuRegisters; ++i) {
if ((kDartAvailableCpuRegs & (1 << i)) == 0) continue;
Register reg = static_cast<Register>(i);
intptr_t start = __ CodeSize();
__ addi(SP, SP, -3 * target::kWordSize);
__ sx(RA, Address(SP, 2 * target::kWordSize));
__ sx(TMP, Address(SP, 1 * target::kWordSize));
__ sx(kWriteBarrierObjectReg, Address(SP, 0 * target::kWordSize));
__ mv(kWriteBarrierObjectReg, reg);
__ Call(Address(THR, target::Thread::write_barrier_entry_point_offset()));
__ lx(kWriteBarrierObjectReg, Address(SP, 0 * target::kWordSize));
__ lx(TMP, Address(SP, 1 * target::kWordSize));
__ lx(RA, Address(SP, 2 * target::kWordSize));
__ addi(SP, SP, 3 * target::kWordSize);
__ jr(TMP); // Return.
intptr_t end = __ CodeSize();
ASSERT_EQUAL(end - start, kStoreBufferWrapperSize);
}
}
// Helper stub to implement Assembler::StoreIntoObject/Array.
// Input parameters:
// A0: Object (old)
// A1: Value (old or new)
// A6: Slot
// If A1 is new, add A0 to the store buffer. Otherwise A1 is old, mark A1
// and add it to the mark list.
COMPILE_ASSERT(kWriteBarrierObjectReg == A0);
COMPILE_ASSERT(kWriteBarrierValueReg == A1);
COMPILE_ASSERT(kWriteBarrierSlotReg == A6);
static void GenerateWriteBarrierStubHelper(Assembler* assembler, bool cards) {
RegisterSet spill_set((1 << T2) | (1 << T3) | (1 << T4), 0);
Label skip_marking;
__ lbu(TMP, FieldAddress(A1, target::Object::tags_offset()));
__ lbu(TMP2, Address(THR, target::Thread::write_barrier_mask_offset()));
__ and_(TMP, TMP, TMP2);
__ andi(TMP, TMP, target::UntaggedObject::kIncrementalBarrierMask);
__ beqz(TMP, &skip_marking);
{
// Atomically clear kNotMarkedBit.
Label is_new, done;
__ PushRegisters(spill_set);
__ addi(T3, A1, target::Object::tags_offset() - kHeapObjectTag);
// T3: Untagged address of header word (amo's do not support offsets).
__ li(TMP2, ~(1 << target::UntaggedObject::kNotMarkedBit));
__ amoandx(TMP2, TMP2, Address(T3, 0));
__ andi(TMP2, TMP2, 1 << target::UntaggedObject::kNotMarkedBit);
__ beqz(TMP2, &done); // Was already clear -> lost race.
__ andi(TMP2, A1, 1 << target::ObjectAlignment::kNewObjectBitPosition);
__ bnez(TMP2, &is_new);
auto mark_stack_push = [&](intptr_t offset, const RuntimeEntry& entry) {
__ lx(T4, Address(THR, offset));
__ lw(T2, Address(T4, target::MarkingStackBlock::top_offset()));
__ slli(T3, T2, target::kWordSizeLog2);
__ add(T3, T4, T3);
__ sx(A1, Address(T3, target::MarkingStackBlock::pointers_offset()));
__ addi(T2, T2, 1);
__ sw(T2, Address(T4, target::MarkingStackBlock::top_offset()));
__ CompareImmediate(T2, target::MarkingStackBlock::kSize);
__ BranchIf(NE, &done);
{
LeafRuntimeScope rt(assembler, /*frame_size=*/0,
/*preserve_registers=*/true);
__ mv(A0, THR);
rt.Call(entry, /*argument_count=*/1);
}
};
mark_stack_push(target::Thread::old_marking_stack_block_offset(),
kOldMarkingStackBlockProcessRuntimeEntry);
__ j(&done);
__ Bind(&is_new);
mark_stack_push(target::Thread::new_marking_stack_block_offset(),
kNewMarkingStackBlockProcessRuntimeEntry);
__ Bind(&done);
__ PopRegisters(spill_set);
}
Label add_to_remembered_set, remember_card;
__ Bind(&skip_marking);
__ lbu(TMP, FieldAddress(A0, target::Object::tags_offset()));
__ lbu(TMP2, FieldAddress(A1, target::Object::tags_offset()));
__ srli(TMP, TMP, target::UntaggedObject::kBarrierOverlapShift);
__ and_(TMP, TMP2, TMP);
__ andi(TMP, TMP, target::UntaggedObject::kGenerationalBarrierMask);
__ bnez(TMP, &add_to_remembered_set);
__ ret();
__ Bind(&add_to_remembered_set);
if (cards) {
__ lbu(TMP2, FieldAddress(A0, target::Object::tags_offset()));
__ andi(TMP2, TMP2, 1 << target::UntaggedObject::kCardRememberedBit);
__ bnez(TMP2, &remember_card);
} else {
#if defined(DEBUG)
Label ok;
__ lbu(TMP2, FieldAddress(A0, target::Object::tags_offset()));
__ andi(TMP2, TMP2, 1 << target::UntaggedObject::kCardRememberedBit);
__ beqz(TMP2, &ok, Assembler::kNearJump);
__ Stop("Wrong barrier!");
__ Bind(&ok);
#endif
}
{
// Atomically clear kOldAndNotRememberedBit.
Label done;
__ PushRegisters(spill_set);
__ addi(T3, A0, target::Object::tags_offset() - kHeapObjectTag);
// T3: Untagged address of header word (amo's do not support offsets).
__ li(TMP2, ~(1 << target::UntaggedObject::kOldAndNotRememberedBit));
__ amoandx(TMP2, TMP2, Address(T3, 0));
__ andi(TMP2, TMP2, 1 << target::UntaggedObject::kOldAndNotRememberedBit);
__ beqz(TMP2, &done); // Was already clear -> lost race.
__ lx(T4, Address(THR, target::Thread::store_buffer_block_offset()));
__ lw(T2, Address(T4, target::StoreBufferBlock::top_offset()));
__ slli(T3, T2, target::kWordSizeLog2);
__ add(T3, T4, T3);
__ sx(A0, Address(T3, target::StoreBufferBlock::pointers_offset()));
__ addi(T2, T2, 1);
__ sw(T2, Address(T4, target::StoreBufferBlock::top_offset()));
__ CompareImmediate(T2, target::StoreBufferBlock::kSize);
__ BranchIf(NE, &done);
{
LeafRuntimeScope rt(assembler, /*frame_size=*/0,
/*preserve_registers=*/true);
__ mv(A0, THR);
rt.Call(kStoreBufferBlockProcessRuntimeEntry, /*argument_count=*/1);
}
__ Bind(&done);
__ PopRegisters(spill_set);
__ ret();
}
if (cards) {
// Get card table.
__ Bind(&remember_card);
__ AndImmediate(TMP, A0, target::Page::kPageMask); // Page.
__ lx(TMP2,
Address(TMP, target::Page::card_table_offset())); // Card table.
// Atomically dirty the card.
__ sub(A6, A6, TMP); // Offset in page.
__ srli(A6, A6, target::Page::kBytesPerCardLog2); // Card index.
__ li(TMP, 1);
__ sll(TMP, TMP, A6); // Bit mask. (Shift amount is mod XLEN.)
__ srli(A6, A6, target::kBitsPerWordLog2);
__ slli(A6, A6, target::kWordSizeLog2);
__ add(TMP2, TMP2, A6); // Card word address.
__ amoorx(ZR, TMP, Address(TMP2, 0));
__ ret();
}
}
void StubCodeCompiler::GenerateWriteBarrierStub() {
GenerateWriteBarrierStubHelper(assembler, false);
}
void StubCodeCompiler::GenerateArrayWriteBarrierStub() {
GenerateWriteBarrierStubHelper(assembler, true);
}
static void GenerateAllocateObjectHelper(Assembler* assembler,
bool is_cls_parameterized) {
const Register kTagsReg = AllocateObjectABI::kTagsReg;
{
Label slow_case;
#if !defined(PRODUCT)
{
const Register kCidRegister = TMP2;
__ ExtractClassIdFromTags(kCidRegister, AllocateObjectABI::kTagsReg);
__ MaybeTraceAllocation(kCidRegister, &slow_case, TMP);
}
#endif
const Register kNewTopReg = T3;
// Bump allocation.
{
const Register kInstanceSizeReg = T4;
const Register kEndReg = T5;
__ ExtractInstanceSizeFromTags(kInstanceSizeReg, kTagsReg);
// Load two words from Thread::top: top and end.
// AllocateObjectABI::kResultReg: potential next object start.
__ lx(AllocateObjectABI::kResultReg,
Address(THR, target::Thread::top_offset()));
__ lx(kEndReg, Address(THR, target::Thread::end_offset()));
__ add(kNewTopReg, AllocateObjectABI::kResultReg, kInstanceSizeReg);
__ CompareRegisters(kEndReg, kNewTopReg);
__ BranchIf(UNSIGNED_LESS_EQUAL, &slow_case);
__ CheckAllocationCanary(AllocateObjectABI::kResultReg);
// Successfully allocated the object, now update top to point to
// next object start and store the class in the class field of object.
__ sx(kNewTopReg, Address(THR, target::Thread::top_offset()));
} // kInstanceSizeReg = R4, kEndReg = R5
// Tags.
__ InitializeHeaderUntagged(kTagsReg, AllocateObjectABI::kResultReg);
// Initialize the remaining words of the object.
{
const Register kFieldReg = T4;
__ AddImmediate(kFieldReg, AllocateObjectABI::kResultReg,
target::Instance::first_field_offset());
Label loop;
__ Bind(&loop);
for (intptr_t offset = 0; offset < target::kObjectAlignment;
offset += target::kCompressedWordSize) {
__ StoreCompressedIntoObjectNoBarrier(AllocateObjectABI::kResultReg,
Address(kFieldReg, offset),
NULL_REG);
}
// Safe to only check every kObjectAlignment bytes instead of each word.
ASSERT(kAllocationRedZoneSize >= target::kObjectAlignment);
__ addi(kFieldReg, kFieldReg, target::kObjectAlignment);
__ bltu(kFieldReg, kNewTopReg, &loop);
__ WriteAllocationCanary(kNewTopReg); // Fix overshoot.
} // kFieldReg = T4
__ AddImmediate(AllocateObjectABI::kResultReg,
AllocateObjectABI::kResultReg, kHeapObjectTag);
if (is_cls_parameterized) {
Label not_parameterized_case;
const Register kClsIdReg = T4;
const Register kTypeOffsetReg = T5;
__ ExtractClassIdFromTags(kClsIdReg, kTagsReg);
// Load class' type_arguments_field offset in words.
__ LoadClassById(kTypeOffsetReg, kClsIdReg);
__ lw(
kTypeOffsetReg,
FieldAddress(kTypeOffsetReg,
target::Class::
host_type_arguments_field_offset_in_words_offset()));
// Set the type arguments in the new object.
__ AddShifted(kTypeOffsetReg, AllocateObjectABI::kResultReg,
kTypeOffsetReg, target::kWordSizeLog2);
__ StoreCompressedIntoObjectNoBarrier(
AllocateObjectABI::kResultReg, FieldAddress(kTypeOffsetReg, 0),
AllocateObjectABI::kTypeArgumentsReg);
__ Bind(&not_parameterized_case);
} // kClsIdReg = R4, kTypeOffsetReg = R5
__ ret();
__ Bind(&slow_case);
} // kNewTopReg = R3
// Fall back on slow case:
if (!is_cls_parameterized) {
__ mv(AllocateObjectABI::kTypeArgumentsReg, NULL_REG);
}
// Tail call to generic allocation stub.
__ lx(
TMP,
Address(THR, target::Thread::allocate_object_slow_entry_point_offset()));
__ jr(TMP);
}
// Called for inline allocation of objects (any class).
void StubCodeCompiler::GenerateAllocateObjectStub() {
GenerateAllocateObjectHelper(assembler, /*is_cls_parameterized=*/false);
}
void StubCodeCompiler::GenerateAllocateObjectParameterizedStub() {
GenerateAllocateObjectHelper(assembler, /*is_cls_parameterized=*/true);
}
void StubCodeCompiler::GenerateAllocateObjectSlowStub() {
if (!FLAG_precompiled_mode) {
__ lx(CODE_REG,
Address(THR, target::Thread::call_to_runtime_stub_offset()));
}
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
__ ExtractClassIdFromTags(AllocateObjectABI::kTagsReg,
AllocateObjectABI::kTagsReg);
__ LoadClassById(A0, AllocateObjectABI::kTagsReg);
__ subi(SP, SP, 3 * target::kWordSize);
__ sx(ZR, Address(SP, 2 * target::kWordSize)); // Result slot.
__ sx(A0, Address(SP, 1 * target::kWordSize)); // Arg0: Class object.
__ sx(AllocateObjectABI::kTypeArgumentsReg,
Address(SP, 0 * target::kWordSize)); // Arg1: Type args or null.
__ CallRuntime(kAllocateObjectRuntimeEntry, 2);
__ lx(AllocateObjectABI::kResultReg, Address(SP, 2 * target::kWordSize));
__ addi(SP, SP, 3 * target::kWordSize);
// Write-barrier elimination is enabled for [cls] and we therefore need to
// ensure that the object is in new-space or has remembered bit set.
EnsureIsNewOrRemembered();
__ LeaveStubFrame();
__ ret();
}
// Called for inline allocation of objects.
void StubCodeCompiler::GenerateAllocationStubForClass(
UnresolvedPcRelativeCalls* unresolved_calls,
const Class& cls,
const Code& allocate_object,
const Code& allocat_object_parametrized) {
classid_t cls_id = target::Class::GetId(cls);
ASSERT(cls_id != kIllegalCid);
// The generated code is different if the class is parameterized.
const bool is_cls_parameterized = target::Class::NumTypeArguments(cls) > 0;
ASSERT(!is_cls_parameterized || target::Class::TypeArgumentsFieldOffset(
cls) != target::Class::kNoTypeArguments);
const intptr_t instance_size = target::Class::GetInstanceSize(cls);
ASSERT(instance_size > 0);
const uword tags =
target::MakeTagWordForNewSpaceObject(cls_id, instance_size);
// Note: Keep in sync with helper function.
const Register kTagsReg = AllocateObjectABI::kTagsReg;
ASSERT(kTagsReg != AllocateObjectABI::kTypeArgumentsReg);
__ LoadImmediate(kTagsReg, tags);
if (!FLAG_use_slow_path && FLAG_inline_alloc &&
!target::Class::TraceAllocation(cls) &&
target::SizeFitsInSizeTag(instance_size)) {
RELEASE_ASSERT(AllocateObjectInstr::WillAllocateNewOrRemembered(cls));
RELEASE_ASSERT(target::Heap::IsAllocatableInNewSpace(instance_size));
if (is_cls_parameterized) {
if (!IsSameObject(NullObject(),
CastHandle<Object>(allocat_object_parametrized))) {
__ GenerateUnRelocatedPcRelativeTailCall();
unresolved_calls->Add(new UnresolvedPcRelativeCall(
__ CodeSize(), allocat_object_parametrized, /*is_tail_call=*/true));
} else {
__ lx(TMP,
Address(THR,
target::Thread::
allocate_object_parameterized_entry_point_offset()));
__ jr(TMP);
}
} else {
if (!IsSameObject(NullObject(), CastHandle<Object>(allocate_object))) {
__ GenerateUnRelocatedPcRelativeTailCall();
unresolved_calls->Add(new UnresolvedPcRelativeCall(
__ CodeSize(), allocate_object, /*is_tail_call=*/true));
} else {
__ lx(
TMP,
Address(THR, target::Thread::allocate_object_entry_point_offset()));
__ jr(TMP);
}
}
} else {
if (!is_cls_parameterized) {
__ LoadObject(AllocateObjectABI::kTypeArgumentsReg, NullObject());
}
__ lx(TMP,
Address(THR,
target::Thread::allocate_object_slow_entry_point_offset()));
__ jr(TMP);
}
}
// Called for invoking "dynamic noSuchMethod(Invocation invocation)" function
// from the entry code of a dart function after an error in passed argument
// name or number is detected.
// Input parameters:
// RA : return address.
// SP : address of last argument.
// S4: arguments descriptor array.
void StubCodeCompiler::GenerateCallClosureNoSuchMethodStub() {
__ EnterStubFrame();
// Load the receiver.
__ LoadCompressedSmiFieldFromOffset(
T2, S4, target::ArgumentsDescriptor::size_offset());
__ AddShifted(TMP, FP, T2, target::kWordSizeLog2 - 1); // T2 is Smi
__ LoadFromOffset(A0, TMP,
target::frame_layout.param_end_from_fp * target::kWordSize);
// Load the function.
__ LoadCompressedFieldFromOffset(TMP, A0, target::Closure::function_offset());
// Push result slot, receiver, function, arguments descriptor.
__ PushRegistersInOrder({ZR, A0, TMP, S4});
// Adjust arguments count.
__ LoadCompressedSmiFieldFromOffset(
T3, S4, target::ArgumentsDescriptor::type_args_len_offset());
Label args_count_ok;
__ beqz(T3, &args_count_ok, Assembler::kNearJump);
// Include the type arguments.
__ addi(T2, T2, target::ToRawSmi(1));
__ Bind(&args_count_ok);
// T2: Smi-tagged arguments array length.
PushArrayOfArguments(assembler);
const intptr_t kNumArgs = 4;
__ CallRuntime(kNoSuchMethodFromPrologueRuntimeEntry, kNumArgs);
// noSuchMethod on closures always throws an error, so it will never return.
__ ebreak();
}
// A6: function object.
// S5: inline cache data object.
// Cannot use function object from ICData as it may be the inlined
// function and not the top-scope function.
void StubCodeCompiler::GenerateOptimizedUsageCounterIncrement() {
if (FLAG_precompiled_mode) {
__ Breakpoint();
return;
}
__ LoadFieldFromOffset(TMP, A6, target::Function::usage_counter_offset(),
kFourBytes);
__ addi(TMP, TMP, 1);
__ StoreFieldToOffset(TMP, A6, target::Function::usage_counter_offset(),
kFourBytes);
}
// Loads function into 'func_reg'.
void StubCodeCompiler::GenerateUsageCounterIncrement(Register func_reg) {
if (FLAG_precompiled_mode) {
__ trap();
return;
}
if (FLAG_optimization_counter_threshold >= 0) {
__ Comment("Increment function counter");
__ LoadFieldFromOffset(func_reg, IC_DATA_REG,
target::ICData::owner_offset());
__ LoadFieldFromOffset(
A1, func_reg, target::Function::usage_counter_offset(), kFourBytes);
__ AddImmediate(A1, 1);
__ StoreFieldToOffset(A1, func_reg,
target::Function::usage_counter_offset(), kFourBytes);
}
}
// Note: S5 must be preserved.
// Attempt a quick Smi operation for known operations ('kind'). The ICData
// must have been primed with a Smi/Smi check that will be used for counting
// the invocations.
static void EmitFastSmiOp(Assembler* assembler,
Token::Kind kind,
intptr_t num_args,
Label* not_smi_or_overflow) {
__ Comment("Fast Smi op");
__ lx(A0, Address(SP, +1 * target::kWordSize)); // Left.
__ lx(A1, Address(SP, +0 * target::kWordSize)); // Right.
__ or_(TMP2, A0, A1);
__ andi(TMP2, TMP2, kSmiTagMask);
__ bnez(TMP2, not_smi_or_overflow);
switch (kind) {
case Token::kADD: {
__ AddBranchOverflow(A0, A0, A1, not_smi_or_overflow);
break;
}
case Token::kLT: {
// TODO(riscv): Bit tricks with stl and NULL_REG.
Label load_true, done;
__ blt(A0, A1, &load_true, compiler::Assembler::kNearJump);
__ LoadObject(A0, CastHandle<Object>(FalseObject()));
__ j(&done, Assembler::kNearJump);
__ Bind(&load_true);
__ LoadObject(A0, CastHandle<Object>(TrueObject()));
__ Bind(&done);
break;
}
case Token::kEQ: {
// TODO(riscv): Bit tricks with stl and NULL_REG.
Label load_true, done;
__ beq(A0, A1, &load_true, Assembler::kNearJump);
__ LoadObject(A0, CastHandle<Object>(FalseObject()));
__ j(&done, Assembler::kNearJump);
__ Bind(&load_true);
__ LoadObject(A0, CastHandle<Object>(TrueObject()));
__ Bind(&done);
break;
}
default:
UNIMPLEMENTED();
}
// S5: IC data object (preserved).
__ LoadFieldFromOffset(A6, IC_DATA_REG, target::ICData::entries_offset());
// R6: ic_data_array with check entries: classes and target functions.
__ AddImmediate(A6, target::Array::data_offset() - kHeapObjectTag);
// R6: points directly to the first ic data array element.
#if defined(DEBUG)
// Check that first entry is for Smi/Smi.
Label error, ok;
const intptr_t imm_smi_cid = target::ToRawSmi(kSmiCid);
__ LoadCompressedSmiFromOffset(TMP, A6, 0);
__ CompareImmediate(TMP, imm_smi_cid);
__ BranchIf(NE, &error);
__ LoadCompressedSmiFromOffset(TMP, A6, target::kCompressedWordSize);
__ CompareImmediate(TMP, imm_smi_cid);
__ BranchIf(EQ, &ok);
__ Bind(&error);
__ Stop("Incorrect IC data");
__ Bind(&ok);
#endif
if (FLAG_optimization_counter_threshold >= 0) {
const intptr_t count_offset =
target::ICData::CountIndexFor(num_args) * target::kCompressedWordSize;
// Update counter, ignore overflow.
__ LoadCompressedSmiFromOffset(A1, A6, count_offset);
__ addi(A1, A1, target::ToRawSmi(1));
__ StoreToOffset(A1, A6, count_offset);
}
__ ret();
}
// Saves the offset of the target entry-point (from the Function) into T6.
//
// Must be the first code generated, since any code before will be skipped in
// the unchecked entry-point.
static void GenerateRecordEntryPoint(Assembler* assembler) {
Label done;
__ LoadImmediate(T6, target::Function::entry_point_offset() - kHeapObjectTag);
__ j(&done, Assembler::kNearJump);
__ BindUncheckedEntryPoint();
__ LoadImmediate(
T6, target::Function::entry_point_offset(CodeEntryKind::kUnchecked) -
kHeapObjectTag);
__ Bind(&done);
}
// Generate inline cache check for 'num_args'.
// A0: receiver (if instance call)
// S5: ICData
// RA: return address
// Control flow:
// - If receiver is null -> jump to IC miss.
// - If receiver is Smi -> load Smi class.
// - If receiver is not-Smi -> load receiver's class.
// - Check if 'num_args' (including receiver) match any IC data group.
// - Match found -> jump to target.
// - Match not found -> jump to IC miss.
void StubCodeCompiler::GenerateNArgsCheckInlineCacheStub(
intptr_t num_args,
const RuntimeEntry& handle_ic_miss,
Token::Kind kind,
Optimized optimized,
CallType type,
Exactness exactness) {
const bool save_entry_point = kind == Token::kILLEGAL;
if (FLAG_precompiled_mode) {
__ Breakpoint();
return;
}
if (save_entry_point) {
GenerateRecordEntryPoint(assembler);
// T6: untagged entry point offset
}
if (optimized == kOptimized) {
GenerateOptimizedUsageCounterIncrement();
} else {
GenerateUsageCounterIncrement(/*temp_reg=*/T0);
}
ASSERT(num_args == 1 || num_args == 2);
#if defined(DEBUG)
{
Label ok;
// Check that the IC data array has NumArgsTested() == num_args.
// 'NumArgsTested' is stored in the least significant bits of 'state_bits'.
__ LoadFromOffset(TMP, IC_DATA_REG,
target::ICData::state_bits_offset() - kHeapObjectTag,
kUnsignedFourBytes);
ASSERT(target::ICData::NumArgsTestedShift() == 0); // No shift needed.
__ andi(TMP, TMP, target::ICData::NumArgsTestedMask());
__ CompareImmediate(TMP2, num_args);
__ BranchIf(EQ, &ok, Assembler::kNearJump);
__ Stop("Incorrect stub for IC data");
__ Bind(&ok);
}
#endif // DEBUG
#if !defined(PRODUCT)
Label stepping, done_stepping;
if (optimized == kUnoptimized) {
__ Comment("Check single stepping");
__ LoadFromOffset(TMP, THR, target::Thread::single_step_offset(),
kUnsignedByte);
__ bnez(TMP, &stepping);
__ Bind(&done_stepping);
}
#endif
Label not_smi_or_overflow;
if (kind != Token::kILLEGAL) {
EmitFastSmiOp(assembler, kind, num_args, &not_smi_or_overflow);
}
__ Bind(&not_smi_or_overflow);
__ Comment("Extract ICData initial values and receiver cid");
// S5: IC data object (preserved).
__ LoadFieldFromOffset(A1, IC_DATA_REG, target::ICData::entries_offset());
// A1: ic_data_array with check entries: classes and target functions.
__ AddImmediate(A1, target::Array::data_offset() - kHeapObjectTag);
// A1: points directly to the first ic data array element.
if (type == kInstanceCall) {
__ LoadTaggedClassIdMayBeSmi(T1, A0);
__ LoadFieldFromOffset(ARGS_DESC_REG, IC_DATA_REG,
target::CallSiteData::arguments_descriptor_offset());
if (num_args == 2) {
__ LoadCompressedSmiFieldFromOffset(
A7, ARGS_DESC_REG, target::ArgumentsDescriptor::count_offset());
__ slli(A7, A7, target::kWordSizeLog2 - kSmiTagSize);
__ add(A7, SP, A7);
__ lx(A6, Address(A7, -2 * target::kWordSize));
__ LoadTaggedClassIdMayBeSmi(T2, A6);
}
} else {
__ LoadFieldFromOffset(ARGS_DESC_REG, IC_DATA_REG,
target::CallSiteData::arguments_descriptor_offset());
__ LoadCompressedSmiFieldFromOffset(
A7, ARGS_DESC_REG, target::ArgumentsDescriptor::count_offset());
__ slli(A7, A7, target::kWordSizeLog2 - kSmiTagSize);
__ add(A7, A7, SP);
__ lx(A6, Address(A7, -1 * target::kWordSize));
__ LoadTaggedClassIdMayBeSmi(T1, A6);
if (num_args == 2) {
__ lx(A6, Address(A7, -2 * target::kWordSize));
__ LoadTaggedClassIdMayBeSmi(T2, A6);
}
}
// T1: first argument class ID as Smi.
// T2: second argument class ID as Smi.
// S4: args descriptor
// We unroll the generic one that is generated once more than the others.
const bool optimize = kind == Token::kILLEGAL;
// Loop that checks if there is an IC data match.
Label loop, found, miss;
__ Comment("ICData loop");
__ Bind(&loop);
for (int unroll = optimize ? 4 : 2; unroll >= 0; unroll--) {
Label update;
__ LoadCompressedSmiFromOffset(A7, A1, 0);
if (num_args == 1) {
__ beq(A7, T1, &found); // Class id match?
} else {
__ bne(A7, T1, &update); // Continue.
__ LoadCompressedSmiFromOffset(A7, A1, target::kCompressedWordSize);
__ beq(A7, T2, &found); // Class id match?
}
__ Bind(&update);
const intptr_t entry_size = target::ICData::TestEntryLengthFor(
num_args, exactness == kCheckExactness) *
target::kCompressedWordSize;
__ AddImmediate(A1, entry_size); // Next entry.
__ CompareImmediate(A7, target::ToRawSmi(kIllegalCid)); // Done?
if (unroll == 0) {
__ BranchIf(NE, &loop);
} else {
__ BranchIf(EQ, &miss);
}
}
__ Bind(&miss);
__ Comment("IC miss");
// Compute address of arguments.
__ LoadCompressedSmiFieldFromOffset(
A7, ARGS_DESC_REG, target::ArgumentsDescriptor::count_offset());
__ slli(A7, A7, target::kWordSizeLog2 - kSmiTagSize);
__ add(A7, A7, SP);
__ subi(A7, A7, 1 * target::kWordSize);
// A7: address of receiver
// Create a stub frame as we are pushing some objects on the stack before
// calling into the runtime.
__ EnterStubFrame();
// Preserve IC data object and arguments descriptor array and
// setup space on stack for result (target code object).
__ PushRegistersInOrder({ARGS_DESC_REG, IC_DATA_REG});
if (save_entry_point) {
__ SmiTag(T6);
__ PushRegister(T6);
}
// Setup space on stack for the result (target code object).
__ PushRegister(ZR);
// Push call arguments.
for (intptr_t i = 0; i < num_args; i++) {
__ LoadFromOffset(TMP, A7, -target::kWordSize * i);
__ PushRegister(TMP);
}
// Pass IC data object.
__ PushRegister(IC_DATA_REG);
__ CallRuntime(handle_ic_miss, num_args + 1);
// Remove the call arguments pushed earlier, including the IC data object.
__ Drop(num_args + 1);
// Pop returned function object into R0.
// Restore arguments descriptor array and IC data array.
__ PopRegister(FUNCTION_REG); // Pop returned function object into T0.
if (save_entry_point) {
__ PopRegister(T6);
__ SmiUntag(T6);
}
__ PopRegister(IC_DATA_REG); // Restore IC Data.
__ PopRegister(ARGS_DESC_REG); // Restore arguments descriptor array.
__ RestoreCodePointer();
__ LeaveStubFrame();
Label call_target_function;
if (FLAG_precompiled_mode) {
GenerateDispatcherCode(assembler, &call_target_function);
} else {
__ j(&call_target_function);
}
__ Bind(&found);
// A1: pointer to an IC data check group.
const intptr_t target_offset =
target::ICData::TargetIndexFor(num_args) * target::kCompressedWordSize;
const intptr_t count_offset =
target::ICData::CountIndexFor(num_args) * target::kCompressedWordSize;
const intptr_t exactness_offset =
target::ICData::ExactnessIndexFor(num_args) * target::kCompressedWordSize;
Label call_target_function_through_unchecked_entry;
if (exactness == kCheckExactness) {
Label exactness_ok;
ASSERT(num_args == 1);
__ LoadCompressedSmi(T1, Address(A1, exactness_offset));
__ LoadImmediate(
TMP, target::ToRawSmi(
StaticTypeExactnessState::HasExactSuperType().Encode()));
__ blt(T1, TMP, &exactness_ok);
__ beq(T1, TMP, &call_target_function_through_unchecked_entry);
// Check trivial exactness.
// Note: UntaggedICData::receivers_static_type_ is guaranteed to be not null
// because we only emit calls to this stub when it is not null.
__ LoadCompressed(
T2, FieldAddress(S5, target::ICData::receivers_static_type_offset()));
__ LoadCompressed(T2, FieldAddress(T2, target::Type::arguments_offset()));
// T1 contains an offset to type arguments in words as a smi,
// hence TIMES_4. A0 is guaranteed to be non-smi because it is expected
// to have type arguments.
__ LoadIndexedPayload(TMP, A0, 0, T1, TIMES_COMPRESSED_HALF_WORD_SIZE,
kObjectBytes);
__ beq(T2, TMP, &call_target_function_through_unchecked_entry);
// Update exactness state (not-exact anymore).
__ LoadImmediate(
TMP, target::ToRawSmi(StaticTypeExactnessState::NotExact().Encode()));
__ StoreToOffset(TMP, A1, exactness_offset, kObjectBytes);
__ Bind(&exactness_ok);
}
__ LoadCompressedFromOffset(FUNCTION_REG, A1, target_offset);
if (FLAG_optimization_counter_threshold >= 0) {
__ Comment("Update caller's counter");
__ LoadCompressedSmiFromOffset(TMP, A1, count_offset);
__ addi(TMP, TMP, target::ToRawSmi(1)); // Ignore overflow.
__ StoreToOffset(TMP, A1, count_offset, kObjectBytes);
}
__ Comment("Call target");
__ Bind(&call_target_function);
// T0: target function.
__ LoadCompressedFieldFromOffset(CODE_REG, FUNCTION_REG,
target::Function::code_offset());
if (save_entry_point) {
__ add(A7, FUNCTION_REG, T6);
__ lx(A7, Address(A7, 0));
} else {
__ LoadFieldFromOffset(A7, FUNCTION_REG,
target::Function::entry_point_offset());
}
__ jr(A7); // FUNCTION_REG: Function, argument to lazy compile stub.
if (exactness == kCheckExactness) {
__ Bind(&call_target_function_through_unchecked_entry);
if (FLAG_optimization_counter_threshold >= 0) {
__ Comment("Update ICData counter");
__ LoadCompressedSmiFromOffset(TMP, A1, count_offset);
__ addi(TMP, TMP, target::ToRawSmi(1)); // Ignore overflow.
__ StoreToOffset(TMP, A1, count_offset, kObjectBytes);
}
__ Comment("Call target (via unchecked entry point)");
__ LoadCompressedFromOffset(FUNCTION_REG, A1, target_offset);
__ LoadCompressedFieldFromOffset(CODE_REG, FUNCTION_REG,
target::Function::code_offset());
__ LoadFieldFromOffset(
A7, FUNCTION_REG,
target::Function::entry_point_offset(CodeEntryKind::kUnchecked));
__ jr(A7);
}
#if !defined(PRODUCT)
if (optimized == kUnoptimized) {
__ Bind(&stepping);
__ EnterStubFrame();
if (type == kInstanceCall) {
__ PushRegister(A0); // Preserve receiver.
}
if (save_entry_point) {
__ SmiTag(T6);
__ PushRegister(T6);
}
__ PushRegister(IC_DATA_REG); // Preserve IC data.
__ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
__ PopRegister(IC_DATA_REG);
if (save_entry_point) {
__ PopRegister(T6);
__ SmiUntag(T6);
}
if (type == kInstanceCall) {
__ PopRegister(A0);
}
__ RestoreCodePointer();
__ LeaveStubFrame();
__ j(&done_stepping);
}
#endif
}
// A0: receiver
// S5: ICData
// RA: return address
void StubCodeCompiler::GenerateOneArgCheckInlineCacheStub() {
GenerateNArgsCheckInlineCacheStub(
1, kInlineCacheMissHandlerOneArgRuntimeEntry, Token::kILLEGAL,
kUnoptimized, kInstanceCall, kIgnoreExactness);
}
// A0: receiver
// S5: ICData
// RA: return address
void StubCodeCompiler::GenerateOneArgCheckInlineCacheWithExactnessCheckStub() {
GenerateNArgsCheckInlineCacheStub(
1, kInlineCacheMissHandlerOneArgRuntimeEntry, Token::kILLEGAL,
kUnoptimized, kInstanceCall, kCheckExactness);
}
// A0: receiver
// S5: ICData
// RA: return address
void StubCodeCompiler::GenerateTwoArgsCheckInlineCacheStub() {
GenerateNArgsCheckInlineCacheStub(
2, kInlineCacheMissHandlerTwoArgsRuntimeEntry, Token::kILLEGAL,
kUnoptimized, kInstanceCall, kIgnoreExactness);
}
// A0: receiver
// S5: ICData
// RA: return address
void StubCodeCompiler::GenerateSmiAddInlineCacheStub() {
GenerateNArgsCheckInlineCacheStub(
2, kInlineCacheMissHandlerTwoArgsRuntimeEntry, Token::kADD, kUnoptimized,
kInstanceCall, kIgnoreExactness);
}
// A0: receiver
// S5: ICData
// RA: return address
void StubCodeCompiler::GenerateSmiLessInlineCacheStub() {
GenerateNArgsCheckInlineCacheStub(
2, kInlineCacheMissHandlerTwoArgsRuntimeEntry, Token::kLT, kUnoptimized,
kInstanceCall, kIgnoreExactness);
}
// A0: receiver
// S5: ICData
// RA: return address
void StubCodeCompiler::GenerateSmiEqualInlineCacheStub() {
GenerateNArgsCheckInlineCacheStub(
2, kInlineCacheMissHandlerTwoArgsRuntimeEntry, Token::kEQ, kUnoptimized,
kInstanceCall, kIgnoreExactness);
}
// A0: receiver
// S5: ICData
// A6: Function
// RA: return address
void StubCodeCompiler::GenerateOneArgOptimizedCheckInlineCacheStub() {
GenerateNArgsCheckInlineCacheStub(
1, kInlineCacheMissHandlerOneArgRuntimeEntry, Token::kILLEGAL, kOptimized,
kInstanceCall, kIgnoreExactness);
}
// A0: receiver
// S5: ICData
// A6: Function
// RA: return address
void StubCodeCompiler::
GenerateOneArgOptimizedCheckInlineCacheWithExactnessCheckStub() {
GenerateNArgsCheckInlineCacheStub(
1, kInlineCacheMissHandlerOneArgRuntimeEntry, Token::kILLEGAL, kOptimized,
kInstanceCall, kCheckExactness);
}
// A0: receiver
// S5: ICData
// A6: Function
// RA: return address
void StubCodeCompiler::GenerateTwoArgsOptimizedCheckInlineCacheStub() {
GenerateNArgsCheckInlineCacheStub(
2, kInlineCacheMissHandlerTwoArgsRuntimeEntry, Token::kILLEGAL,
kOptimized, kInstanceCall, kIgnoreExactness);
}
// S5: ICData
// RA: return address
void StubCodeCompiler::GenerateZeroArgsUnoptimizedStaticCallStub() {
GenerateRecordEntryPoint(assembler);
GenerateUsageCounterIncrement(/* scratch */ T0);
#if defined(DEBUG)
{
Label ok;
// Check that the IC data array has NumArgsTested() == 0.
// 'NumArgsTested' is stored in the least significant bits of 'state_bits'.
__ LoadFromOffset(TMP, IC_DATA_REG,
target::ICData::state_bits_offset() - kHeapObjectTag,
kUnsignedFourBytes);
ASSERT(target::ICData::NumArgsTestedShift() == 0); // No shift needed.
__ andi(TMP, TMP, target::ICData::NumArgsTestedMask());
__ CompareImmediate(TMP, 0);
__ BranchIf(EQ, &ok);
__ Stop("Incorrect IC data for unoptimized static call");
__ Bind(&ok);
}
#endif // DEBUG
// Check single stepping.
#if !defined(PRODUCT)
Label stepping, done_stepping;
__ LoadFromOffset(TMP, THR, target::Thread::single_step_offset(),
kUnsignedByte);
__ bnez(TMP, &stepping, Assembler::kNearJump);
__ Bind(&done_stepping);
#endif
// T5: IC data object (preserved).
__ LoadFieldFromOffset(A0, IC_DATA_REG, target::ICData::entries_offset());
// A0: ic_data_array with entries: target functions and count.
__ AddImmediate(A0, target::Array::data_offset() - kHeapObjectTag);
// A0: points directly to the first ic data array element.
const intptr_t target_offset =
target::ICData::TargetIndexFor(0) * target::kCompressedWordSize;
const intptr_t count_offset =
target::ICData::CountIndexFor(0) * target::kCompressedWordSize;
if (FLAG_optimization_counter_threshold >= 0) {
// Increment count for this call, ignore overflow.
__ LoadCompressedSmiFromOffset(TMP, A0, count_offset);
__ addi(TMP, TMP, target::ToRawSmi(1));
__ StoreToOffset(TMP, A0, count_offset);
}
// Load arguments descriptor into T4.
__ LoadFieldFromOffset(ARGS_DESC_REG, IC_DATA_REG,
target::CallSiteData::arguments_descriptor_offset());
// Get function and call it, if possible.
__ LoadCompressedFromOffset(FUNCTION_REG, A0, target_offset);
__ LoadCompressedFieldFromOffset(CODE_REG, FUNCTION_REG,
target::Function::code_offset());
__ add(A0, FUNCTION_REG, T6);
__ lx(TMP, Address(A0, 0));
__ jr(TMP); // FUNCTION_REG: Function, argument to lazy compile stub.
#if !defined(PRODUCT)
__ Bind(&stepping);
__ EnterStubFrame();
__ PushRegister(IC_DATA_REG); // Preserve IC data.
__ SmiTag(T6);
__ PushRegister(T6);
__ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
__ PopRegister(T6);
__ SmiUntag(T6);
__ PopRegister(IC_DATA_REG);
__ RestoreCodePointer();
__ LeaveStubFrame();
__ j(&done_stepping);
#endif
}
// S5: ICData
// RA: return address
void StubCodeCompiler::GenerateOneArgUnoptimizedStaticCallStub() {
GenerateUsageCounterIncrement(/* scratch */ T0);
GenerateNArgsCheckInlineCacheStub(1, kStaticCallMissHandlerOneArgRuntimeEntry,
Token::kILLEGAL, kUnoptimized, kStaticCall,
kIgnoreExactness);
}
// S5: ICData
// RA: return address
void StubCodeCompiler::GenerateTwoArgsUnoptimizedStaticCallStub() {
GenerateUsageCounterIncrement(/* scratch */ T0);
GenerateNArgsCheckInlineCacheStub(
2, kStaticCallMissHandlerTwoArgsRuntimeEntry, Token::kILLEGAL,
kUnoptimized, kStaticCall, kIgnoreExactness);
}
// Stub for compiling a function and jumping to the compiled code.
// ARGS_DESC_REG: Arguments descriptor.
// FUNCTION_REG: Function.
void StubCodeCompiler::GenerateLazyCompileStub() {
// Preserve arg desc.
__ EnterStubFrame();
// Save arguments descriptor and pass function.
__ PushRegistersInOrder({ARGS_DESC_REG, FUNCTION_REG});
__ CallRuntime(kCompileFunctionRuntimeEntry, 1);
__ PopRegister(FUNCTION_REG); // Restore function.
__ PopRegister(ARGS_DESC_REG); // Restore arg desc.
__ LeaveStubFrame();
__ LoadCompressedFieldFromOffset(CODE_REG, FUNCTION_REG,
target::Function::code_offset());
__ LoadFieldFromOffset(TMP, FUNCTION_REG,
target::Function::entry_point_offset());
__ jr(TMP);
}
// Stub for interpreting a function call.
// ARGS_DESC_REG: Arguments descriptor.
// FUNCTION_REG: Function.
void StubCodeCompiler::GenerateInterpretCallStub() {
__ Stop("Not implemented on RISC-V.");
}
// A0: Receiver
// S5: ICData
void StubCodeCompiler::GenerateICCallBreakpointStub() {
#if defined(PRODUCT)
__ Stop("No debugging in PRODUCT mode");
#else
__ EnterStubFrame();
__ subi(SP, SP, 3 * target::kWordSize);
__ sx(A0, Address(SP, 2 * target::kWordSize)); // Preserve receiver.
__ sx(S5, Address(SP, 1 * target::kWordSize)); // Preserve IC data.
__ sx(ZR, Address(SP, 0 * target::kWordSize)); // Space for result.
__ CallRuntime(kBreakpointRuntimeHandlerRuntimeEntry, 0);
__ lx(CODE_REG, Address(SP, 0 * target::kWordSize)); // Original stub.
__ lx(S5, Address(SP, 1 * target::kWordSize)); // Restore IC data.
__ lx(A0, Address(SP, 2 * target::kWordSize)); // Restore receiver.
__ LeaveStubFrame();
__ LoadFieldFromOffset(TMP, CODE_REG, target::Code::entry_point_offset());
__ jr(TMP);
#endif
}
// S5: ICData
void StubCodeCompiler::GenerateUnoptStaticCallBreakpointStub() {
#if defined(PRODUCT)
__ Stop("No debugging in PRODUCT mode");
#else
__ EnterStubFrame();
__ subi(SP, SP, 2 * target::kWordSize);
__ sx(S5, Address(SP, 1 * target::kWordSize)); // Preserve IC data.
__ sx(ZR, Address(SP, 0 * target::kWordSize)); // Space for result.
__ CallRuntime(kBreakpointRuntimeHandlerRuntimeEntry, 0);
__ lx(CODE_REG, Address(SP, 0 * target::kWordSize)); // Original stub.
__ lx(S5, Address(SP, 1 * target::kWordSize)); // Restore IC data.
__ LeaveStubFrame();
__ LoadFieldFromOffset(TMP, CODE_REG, target::Code::entry_point_offset());
__ jr(TMP);
#endif // defined(PRODUCT)
}
void StubCodeCompiler::GenerateRuntimeCallBreakpointStub() {
#if defined(PRODUCT)
__ Stop("No debugging in PRODUCT mode");
#else
__ EnterStubFrame();
__ subi(SP, SP, 1 * target::kWordSize);
__ sx(ZR, Address(SP, 0 * target::kWordSize)); // Space for result.
__ CallRuntime(kBreakpointRuntimeHandlerRuntimeEntry, 0);
__ lx(CODE_REG, Address(SP, 0 * target::kWordSize));
__ LeaveStubFrame();
__ LoadFieldFromOffset(TMP, CODE_REG, target::Code::entry_point_offset());
__ jr(TMP);
#endif // defined(PRODUCT)
}
// Called only from unoptimized code. All relevant registers have been saved.
void StubCodeCompiler::GenerateDebugStepCheckStub() {
#if defined(PRODUCT)
__ Stop("No debugging in PRODUCT mode");
#else
// Check single stepping.
Label stepping, done_stepping;
__ LoadFromOffset(A1, THR, target::Thread::single_step_offset(),
kUnsignedByte);
__ bnez(A1, &stepping, compiler::Assembler::kNearJump);
__ Bind(&done_stepping);
__ ret();
__ Bind(&stepping);
__ EnterStubFrame();
__ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
__ LeaveStubFrame();
__ j(&done_stepping);
#endif // defined(PRODUCT)
}
// Used to check class and type arguments. Arguments passed in registers:
//
// Inputs (all preserved, mostly from TypeTestABI struct):
// - kSubtypeTestCacheReg: UntaggedSubtypeTestCache
// - kInstanceReg: instance to test against.
// - kDstTypeReg: destination type (for n>=7).
// - kInstantiatorTypeArgumentsReg: instantiator type arguments (for n>=3).
// - kFunctionTypeArgumentsReg: function type arguments (for n>=4).
// - RA: return address.
//
// Outputs (from TypeTestABI struct):
// - kSubtypeTestCacheResultReg: the cached result, or null if not found.
void StubCodeCompiler::GenerateSubtypeNTestCacheStub(Assembler* assembler,
int n) {
ASSERT(n >= 1);
ASSERT(n <= SubtypeTestCache::kMaxInputs);
// If we need the parent function type arguments for a closure, we also need
// the delayed type arguments, so this case will never happen.
ASSERT(n != 5);
// We could initialize kSubtypeTestCacheResultReg with null and use that as
// the null register up until exit, which means we'd just need to return
// without setting it in the not_found case.
//
// However, that would mean the expense of keeping another register live
// across the loop to hold the cache entry address, and the not_found case
// means we're going to runtime, so optimize for the found case instead.
//
// Thus, we use it to store the current cache entry, since it's distinct from
// all the preserved input registers and the scratch register, and the last
// use of the current cache entry is to set kSubtypeTestCacheResultReg.
const Register kCacheArrayReg = TypeTestABI::kSubtypeTestCacheResultReg;
Label not_found;
GenerateSubtypeTestCacheSearch(
assembler, n, NULL_REG, kCacheArrayReg,
STCInternalRegs::kInstanceCidOrSignatureReg,
STCInternalRegs::kInstanceInstantiatorTypeArgumentsReg,
STCInternalRegs::kInstanceParentFunctionTypeArgumentsReg,
STCInternalRegs::kInstanceDelayedFunctionTypeArgumentsReg,
STCInternalRegs::kCacheEntriesEndReg,
STCInternalRegs::kCacheContentsSizeReg,
STCInternalRegs::kProbeDistanceReg,
[&](Assembler* assembler, int n) {
__ LoadCompressed(
TypeTestABI::kSubtypeTestCacheResultReg,
Address(kCacheArrayReg, target::kCompressedWordSize *
target::SubtypeTestCache::kTestResult));
__ Ret();
},
[&](Assembler* assembler, int n) {
__ MoveRegister(TypeTestABI::kSubtypeTestCacheResultReg, NULL_REG);
__ Ret();
});
}
// Jump to a frame on the call stack.
// RA: return address.
// A0: program_counter.
// A1: stack_pointer.
// A2: frame_pointer.
// A3: thread.
// Does not return.
//
// Notice: We need to keep this in sync with `Simulator::JumpToFrame()`.
void StubCodeCompiler::GenerateJumpToFrameStub() {
ASSERT(kExceptionObjectReg == A0);
ASSERT(kStackTraceObjectReg == A1);
__ mv(THR, A3);
if (FLAG_target_thread_sanitizer) {
Label again, done;
__ lx(CALLEE_SAVED_TEMP,
Address(THR, target::Thread::top_exit_frame_info_offset()));
// Skip CallToRuntime/CallNativeWithWrapper stub frame, which did not call
// __tsan_func_entry.
__ lx(CALLEE_SAVED_TEMP,
Address(CALLEE_SAVED_TEMP,
target::frame_layout.saved_caller_fp_from_fp *
target::kWordSize));
__ Bind(&again);
__ beq(CALLEE_SAVED_TEMP, A2, &done);
__ TsanFuncExit();
__ lx(CALLEE_SAVED_TEMP,
Address(CALLEE_SAVED_TEMP,
target::frame_layout.saved_caller_fp_from_fp *
target::kWordSize));
__ j(&again);
__ Bind(&done);
}
__ mv(CALLEE_SAVED_TEMP, A0); // Program counter.
__ mv(SP, A1); // Stack pointer.
__ mv(FP, A2); // Frame_pointer.
#if defined(DART_TARGET_OS_FUCHSIA) || defined(DART_TARGET_OS_ANDROID)
// We need to restore the shadow call stack pointer like longjmp would,
// effectively popping all the return addresses between the Dart exit frame
// and Exceptions::JumpToFrame, otherwise the shadow call stack might
// eventually overflow.
__ lx(GP, Address(THR, target::Thread::saved_shadow_call_stack_offset()));
// TODO(riscv): Enable once Fuchsia/Android have Zimop in their baseline.
// __ lx(TMP, Address(THR, target::Thread::saved_ss_offset()));
// Label ss_disabled;
// __ beqz(TMP, &ss_disabled);
// __ csrw(0x011, TMP);
// __ Bind(&ss_disabled);
#elif defined(USING_SHADOW_CALL_STACK)
#error Unimplemented
#endif
// Refresh pinned registers values (inc. write barrier mask and null object).
__ RestorePinnedRegisters();
// Set the tag.
__ LoadImmediate(TMP, VMTag::kDartTagId);
__ StoreToOffset(TMP, THR, target::Thread::vm_tag_offset());
// Clear top exit frame.
__ StoreToOffset(ZR, THR, target::Thread::top_exit_frame_info_offset());
// Restore the pool pointer.
__ RestoreCodePointer();
if (FLAG_precompiled_mode) {
__ SetupGlobalPoolAndDispatchTable();
} else {
__ LoadPoolPointer();
}
__ jr(CALLEE_SAVED_TEMP); // Jump to continuation point.
}
// Run an exception handler. Execution comes from JumpToFrame
// stub or from the simulator.
//
// The arguments are stored in the Thread object.
// Does not return.
static void GenerateRunExceptionHandler(Assembler* assembler,
bool unbox_exception) {
// Exception object.
ASSERT(kExceptionObjectReg == A0);
__ LoadFromOffset(A0, THR, target::Thread::active_exception_offset());
__ StoreToOffset(NULL_REG, THR, target::Thread::active_exception_offset());
if (unbox_exception) {
compiler::Label not_smi, done;
__ BranchIfNotSmi(A0, &not_smi);
__ SmiUntag(A0);
__ Jump(&done);
__ Bind(&not_smi);
__ lx(A0, FieldAddress(A0, Mint::value_offset()));
__ Bind(&done);
}
// StackTrace object.
ASSERT(kStackTraceObjectReg == A1);
__ LoadFromOffset(A1, THR, target::Thread::active_stacktrace_offset());
__ StoreToOffset(NULL_REG, THR, target::Thread::active_stacktrace_offset());
__ LoadFromOffset(RA, THR, target::Thread::resume_pc_offset());
__ ret(); // Jump to the exception handler code.
}
void StubCodeCompiler::GenerateRunExceptionHandlerStub() {
GenerateRunExceptionHandler(assembler, false);
}
void StubCodeCompiler::GenerateRunExceptionHandlerUnboxStub() {
GenerateRunExceptionHandler(assembler, true);
}
// Deoptimize a frame on the call stack before rewinding.
// The arguments are stored in the Thread object.
// No result.
void StubCodeCompiler::GenerateDeoptForRewindStub() {
// Push zap value instead of CODE_REG.
__ LoadImmediate(TMP, kZapCodeReg);
__ PushRegister(TMP);
// Load the deopt pc into RA.
__ LoadFromOffset(RA, THR, target::Thread::resume_pc_offset());
GenerateDeoptimizationSequence(assembler, kEagerDeopt);
// After we have deoptimized, jump to the correct frame.
__ EnterStubFrame();
__ CallRuntime(kRewindPostDeoptRuntimeEntry, 0);
__ LeaveStubFrame();
__ ebreak();
}
// Calls to the runtime to optimize the given function.
// A0: function to be re-optimized.
// ARGS_DESC_REG: argument descriptor (preserved).
void StubCodeCompiler::GenerateOptimizeFunctionStub() {
__ LoadFromOffset(CODE_REG, THR, target::Thread::optimize_stub_offset());
__ EnterStubFrame();
__ subi(SP, SP, 3 * target::kWordSize);
__ sx(ARGS_DESC_REG,
Address(SP, 2 * target::kWordSize)); // Preserves args descriptor.
__ sx(ZR, Address(SP, 1 * target::kWordSize)); // Result slot.
__ sx(A0, Address(SP, 0 * target::kWordSize)); // Function argument.
__ CallRuntime(kOptimizeInvokedFunctionRuntimeEntry, 1);
__ lx(FUNCTION_REG, Address(SP, 1 * target::kWordSize)); // Function result.
__ lx(ARGS_DESC_REG,
Address(SP, 2 * target::kWordSize)); // Restore args descriptor.
__ addi(SP, SP, 3 * target::kWordSize);
__ LoadCompressedFieldFromOffset(CODE_REG, FUNCTION_REG,
target::Function::code_offset());
__ LoadFieldFromOffset(A1, FUNCTION_REG,
target::Function::entry_point_offset());
__ LeaveStubFrame();
__ jr(A1);
__ ebreak();
}
// Does identical check (object references are equal or not equal) with special
// checks for boxed numbers and returns with TMP = 0 iff left and right are
// identical.
static void GenerateIdenticalWithNumberCheckStub(Assembler* assembler,
const Register left,
const Register right) {
Label reference_compare, check_mint, done;
// If any of the arguments is Smi do reference compare.
// Note: A Mint cannot contain a value that would fit in Smi.
__ BranchIfSmi(left, &reference_compare, Assembler::kNearJump);
__ BranchIfSmi(right, &reference_compare, Assembler::kNearJump);
// Value compare for two doubles.
__ CompareClassId(left, kDoubleCid, /*scratch*/ TMP);
__ BranchIf(NOT_EQUAL, &check_mint, Assembler::kNearJump);
__ CompareClassId(right, kDoubleCid, /*scratch*/ TMP);
__ BranchIf(NOT_EQUAL, &reference_compare, Assembler::kNearJump);
// Double values bitwise compare.
#if XLEN == 32
__ lw(T0, FieldAddress(left, target::Double::value_offset()));
__ lw(T1, FieldAddress(right, target::Double::value_offset()));
__ xor_(TMP, T0, T1);
__ lw(T0, FieldAddress(left, target::Double::value_offset() + 4));
__ lw(T1, FieldAddress(right, target::Double::value_offset() + 4));
__ xor_(TMP2, T0, T1);
__ or_(TMP, TMP, TMP2);
#else
__ ld(T0, FieldAddress(left, target::Double::value_offset()));
__ ld(T1, FieldAddress(right, target::Double::value_offset()));
__ xor_(TMP, T0, T1);
#endif
__ j(&done, Assembler::kNearJump);
__ Bind(&check_mint);
__ CompareClassId(left, kMintCid, /*scratch*/ TMP);
__ BranchIf(NOT_EQUAL, &reference_compare, Assembler::kNearJump);
__ CompareClassId(right, kMintCid, /*scratch*/ TMP);
__ BranchIf(NOT_EQUAL, &reference_compare, Assembler::kNearJump);
#if XLEN == 32
__ lw(T0, FieldAddress(left, target::Mint::value_offset()));
__ lw(T1, FieldAddress(right, target::Mint::value_offset()));
__ xor_(TMP, T0, T1);
__ lw(T0, FieldAddress(left, target::Mint::value_offset() + 4));
__ lw(T1, FieldAddress(right, target::Mint::value_offset() + 4));
__ xor_(TMP2, T0, T1);
__ or_(TMP, TMP, TMP2);
#else
__ ld(T0, FieldAddress(left, target::Mint::value_offset()));
__ ld(T1, FieldAddress(right, target::Mint::value_offset()));
__ xor_(TMP, T0, T1);
#endif
__ j(&done, Assembler::kNearJump);
__ Bind(&reference_compare);
__ xor_(TMP, left, right);
__ Bind(&done);
}
// Called only from unoptimized code. All relevant registers have been saved.
// RA: return address.
// SP + 4: left operand.
// SP + 0: right operand.
// Return TMP set to 0 if equal.
void StubCodeCompiler::GenerateUnoptimizedIdenticalWithNumberCheckStub() {
#if !defined(PRODUCT)
// Check single stepping.
Label stepping, done_stepping;
__ LoadFromOffset(TMP, THR, target::Thread::single_step_offset(),
kUnsignedByte);
__ bnez(TMP, &stepping);
__ Bind(&done_stepping);
#endif
const Register left = A0;
const Register right = A1;
__ LoadFromOffset(left, SP, 1 * target::kWordSize);
__ LoadFromOffset(right, SP, 0 * target::kWordSize);
GenerateIdenticalWithNumberCheckStub(assembler, left, right);
__ ret();
#if !defined(PRODUCT)
__ Bind(&stepping);
__ EnterStubFrame();
__ CallRuntime(kSingleStepHandlerRuntimeEntry, 0);
__ RestoreCodePointer();
__ LeaveStubFrame();
__ j(&done_stepping);
#endif
}
// Called from optimized code only.
// RA: return address.
// SP + 4: left operand.
// SP + 0: right operand.
// Return TMP set to 0 if equal.
void StubCodeCompiler::GenerateOptimizedIdenticalWithNumberCheckStub() {
const Register left = A0;
const Register right = A1;
__ LoadFromOffset(left, SP, 1 * target::kWordSize);
__ LoadFromOffset(right, SP, 0 * target::kWordSize);
GenerateIdenticalWithNumberCheckStub(assembler, left, right);
__ ret();
}
// Called from megamorphic call sites.
// A0: receiver (passed to target)
// IC_DATA_REG: MegamorphicCache (preserved)
// Passed to target:
// FUNCTION_REG: target function
// CODE_REG: target Code
// ARGS_DESC_REG: arguments descriptor
void StubCodeCompiler::GenerateMegamorphicCallStub() {
// Jump if receiver is a smi.
Label smi_case;
__ BranchIfSmi(A0, &smi_case);
// Loads the cid of the object.
__ LoadClassId(T5, A0);
Label cid_loaded;
__ Bind(&cid_loaded);
__ lx(T1, FieldAddress(IC_DATA_REG, target::MegamorphicCache::mask_offset()));
__ lx(T2,
FieldAddress(IC_DATA_REG, target::MegamorphicCache::buckets_offset()));
// T1: mask as a smi - load first to support insertion w/o stopping Dart code.
// T2: cache buckets array.
// Make the cid into a smi.
__ SmiTag(T5);
// T5: class ID of the receiver (smi).
// Compute the table index.
ASSERT(target::MegamorphicCache::kSpreadFactor == 7);
// Use lsl and sub to multiply with 7 == 8 - 1.
__ slli(T3, T5, 3);
__ sub(T3, T3, T5);
// T3: probe.
Label loop;
__ Bind(&loop);
__ and_(T3, T3, T1);
const intptr_t base = target::Array::data_offset();
// T3 is smi tagged, but table entries are 16 bytes, so LSL 3.
__ AddShifted(TMP, T2, T3, kCompressedWordSizeLog2);
__ LoadCompressedSmiFieldFromOffset(T4, TMP, base);
Label probe_failed;
__ CompareObjectRegisters(T4, T5);
__ BranchIf(NE, &probe_failed);
Label load_target;
__ Bind(&load_target);
// Call the target found in the cache. For a class id match, this is a
// proper target for the given name and arguments descriptor. If the
// illegal class id was found, the target is a cache miss handler that can
// be invoked as a normal Dart function.
__ LoadCompressed(FUNCTION_REG,
FieldAddress(TMP, base + target::kCompressedWordSize));
__ lx(A1, FieldAddress(FUNCTION_REG, target::Function::entry_point_offset()));
__ lx(ARGS_DESC_REG,
FieldAddress(IC_DATA_REG,
target::CallSiteData::arguments_descriptor_offset()));
if (!FLAG_precompiled_mode) {
__ LoadCompressed(
CODE_REG, FieldAddress(FUNCTION_REG, target::Function::code_offset()));
}
__ jr(A1); // T0: Function, argument to lazy compile stub.
// Probe failed, check if it is a miss.
__ Bind(&probe_failed);
ASSERT(kIllegalCid == 0);
Label miss;
__ beqz(T4, &miss); // branch if miss.
// Try next extry in the table.
__ AddImmediate(T3, target::ToRawSmi(1));
__ j(&loop);
// Load cid for the Smi case.
__ Bind(&smi_case);
__ LoadImmediate(T5, kSmiCid);
__ j(&cid_loaded);
__ Bind(&miss);
GenerateSwitchableCallMissStub();
}
// Input:
// A0 - receiver
// IC_DATA_REG - icdata
void StubCodeCompiler::GenerateICCallThroughCodeStub() {
Label loop, found, miss;
__ lx(T1, FieldAddress(IC_DATA_REG, target::ICData::entries_offset()));
__ lx(ARGS_DESC_REG,
FieldAddress(IC_DATA_REG,
target::CallSiteData::arguments_descriptor_offset()));
__ AddImmediate(T1, target::Array::data_offset() - kHeapObjectTag);
// T1: first IC entry
__ LoadTaggedClassIdMayBeSmi(A1, A0);
// A1: receiver cid as Smi
__ Bind(&loop);
__ LoadCompressedSmi(T2, Address(T1, 0));
__ beq(A1, T2, &found);
__ CompareImmediate(T2, target::ToRawSmi(kIllegalCid));
__ BranchIf(EQ, &miss);
const intptr_t entry_length =
target::ICData::TestEntryLengthFor(1, /*exactness_check=*/false) *
target::kCompressedWordSize;
__ AddImmediate(T1, entry_length); // Next entry.
__ j(&loop);
__ Bind(&found);
if (FLAG_precompiled_mode) {
const intptr_t entry_offset =
target::ICData::EntryPointIndexFor(1) * target::kCompressedWordSize;
__ LoadCompressed(FUNCTION_REG, Address(T1, entry_offset));
__ lx(A1,
FieldAddress(FUNCTION_REG, target::Function::entry_point_offset()));
} else {
const intptr_t code_offset =
target::ICData::CodeIndexFor(1) * target::kCompressedWordSize;
__ LoadCompressed(CODE_REG, Address(T1, code_offset));
__ lx(A1, FieldAddress(CODE_REG, target::Code::entry_point_offset()));
}
__ jr(A1);
__ Bind(&miss);
__ lx(A1, Address(THR, target::Thread::switchable_call_miss_entry_offset()));
__ jr(A1);
}
// Implement the monomorphic entry check for call-sites where the receiver
// might be a Smi.
//
// A0: receiver
// S5: MonomorphicSmiableCall object
//
// T1,T2: clobbered
void StubCodeCompiler::GenerateMonomorphicSmiableCheckStub() {
Label miss;
__ LoadClassIdMayBeSmi(T1, A0);
// Note: this stub is only used in AOT mode, hence the direct (bare) call.
__ LoadField(
T2,
FieldAddress(S5, target::MonomorphicSmiableCall::expected_cid_offset()));
__ LoadField(
TMP,
FieldAddress(S5, target::MonomorphicSmiableCall::entrypoint_offset()));
__ bne(T1, T2, &miss);
__ jr(TMP);
__ Bind(&miss);
__ lx(TMP, Address(THR, target::Thread::switchable_call_miss_entry_offset()));
__ jr(TMP);
}
// Called from switchable IC calls.
// A0: receiver
void StubCodeCompiler::GenerateSwitchableCallMissStub() {
__ lx(CODE_REG,
Address(THR, target::Thread::switchable_call_miss_stub_offset()));
__ EnterStubFrame();
// Preserve receiver, setup result slot,
// pass Arg0: stub out and Arg1: Receiver.
__ PushRegistersInOrder({A0, ZR, ZR, A0});
__ CallRuntime(kSwitchableCallMissRuntimeEntry, 2);
__ Drop(1);
__ PopRegister(CODE_REG); // result = stub
__ PopRegister(IC_DATA_REG); // result = IC
__ PopRegister(A0); // Restore receiver.
__ LeaveStubFrame();
__ lx(TMP, FieldAddress(CODE_REG, target::Code::entry_point_offset(
CodeEntryKind::kNormal)));
__ jr(TMP);
}
// Called from switchable IC calls.
// A0: receiver
// S5: SingleTargetCache
// Passed to target:
// CODE_REG: target Code object
void StubCodeCompiler::GenerateSingleTargetCallStub() {
Label miss;
__ LoadClassIdMayBeSmi(A1, A0);
__ lhu(T2, FieldAddress(S5, target::SingleTargetCache::lower_limit_offset()));
__ lhu(T3, FieldAddress(S5, target::SingleTargetCache::upper_limit_offset()));
__ blt(A1, T2, &miss);
__ bgt(A1, T3, &miss);
__ lx(TMP, FieldAddress(S5, target::SingleTargetCache::entry_point_offset()));
__ lx(CODE_REG, FieldAddress(S5, target::SingleTargetCache::target_offset()));
__ jr(TMP);
__ Bind(&miss);
__ EnterStubFrame();
// Preserve receiver, setup result slot,
// pass Arg0: Stub out and Arg1: Receiver.
__ PushRegistersInOrder({A0, ZR, ZR, A0});
__ CallRuntime(kSwitchableCallMissRuntimeEntry, 2);
__ Drop(1);
__ PopRegister(CODE_REG); // result = stub
__ PopRegister(S5); // result = IC
__ PopRegister(A0); // Restore receiver.
__ LeaveStubFrame();
__ lx(TMP, FieldAddress(CODE_REG, target::Code::entry_point_offset(
CodeEntryKind::kMonomorphic)));
__ jr(TMP);
}
static int GetScaleFactor(intptr_t size) {
switch (size) {
case 1:
return 0;
case 2:
return 1;
case 4:
return 2;
case 8:
return 3;
case 16:
return 4;
}
UNREACHABLE();
return -1;
}
void StubCodeCompiler::GenerateAllocateTypedDataArrayStub(intptr_t cid) {
const intptr_t element_size = TypedDataElementSizeInBytes(cid);
const intptr_t max_len = TypedDataMaxNewSpaceElements(cid);
const intptr_t scale_shift = GetScaleFactor(element_size);
COMPILE_ASSERT(AllocateTypedDataArrayABI::kLengthReg == T2);
COMPILE_ASSERT(AllocateTypedDataArrayABI::kResultReg == A0);
if (!FLAG_use_slow_path && FLAG_inline_alloc) {
Label call_runtime;
NOT_IN_PRODUCT(__ MaybeTraceAllocation(cid, &call_runtime, T3));
__ mv(T3, AllocateTypedDataArrayABI::kLengthReg);
/* Check that length is a positive Smi. */
/* T3: requested array length argument. */
__ BranchIfNotSmi(T3, &call_runtime);
__ SmiUntag(T3);
/* Check for length >= 0 && length <= max_len. */
/* T3: untagged array length. */
__ CompareImmediate(T3, max_len, kObjectBytes);
__ BranchIf(UNSIGNED_GREATER, &call_runtime);
if (scale_shift != 0) {
__ slli(T3, T3, scale_shift);
}
const intptr_t fixed_size_plus_alignment_padding =
target::TypedData::HeaderSize() +
target::ObjectAlignment::kObjectAlignment - 1;
__ AddImmediate(T3, fixed_size_plus_alignment_padding);
__ andi(T3, T3, ~(target::ObjectAlignment::kObjectAlignment - 1));
__ lx(A0, Address(THR, target::Thread::top_offset()));
/* T3: allocation size. */
__ add(T4, A0, T3);
__ bltu(T4, A0, &call_runtime); /* Fail on unsigned overflow. */
/* Check if the allocation fits into the remaining space. */
/* A0: potential new object start. */
/* T4: potential next object start. */
/* T3: allocation size. */
__ lx(TMP, Address(THR, target::Thread::end_offset()));
__ bgeu(T4, TMP, &call_runtime);
__ CheckAllocationCanary(A0);
/* Successfully allocated the object(s), now update top to point to */
/* next object start and initialize the object. */
__ sx(T4, Address(THR, target::Thread::top_offset()));
__ AddImmediate(A0, kHeapObjectTag);
/* Initialize the tags. */
/* A0: new object start as a tagged pointer. */
/* T4: new object end address. */
/* T3: allocation size. */
{
__ li(T5, 0);
__ CompareImmediate(T3, target::UntaggedObject::kSizeTagMaxSizeTag);
compiler::Label zero_tags;
__ BranchIf(HI, &zero_tags);
__ slli(T5, T3,
target::UntaggedObject::kSizeTagPos -
target::ObjectAlignment::kObjectAlignmentLog2);
__ Bind(&zero_tags);
/* Get the class index and insert it into the tags. */
uword tags =
target::MakeTagWordForNewSpaceObject(cid, /*instance_size=*/0);
__ OrImmediate(T5, T5, tags);
__ InitializeHeader(T5, A0);
}
/* Set the length field. */
/* A0: new object start as a tagged pointer. */
/* T4: new object end address. */
__ mv(T3, AllocateTypedDataArrayABI::kLengthReg); /* Array length. */
__ StoreCompressedIntoObjectNoBarrier(
A0, FieldAddress(A0, target::TypedDataBase::length_offset()), T3);
/* Initialize all array elements to 0. */
/* A0: new object start as a tagged pointer. */
/* T4: new object end address. */
/* T3: iterator which initially points to the start of the variable */
/* R3: scratch register. */
/* data area to be initialized. */
__ AddImmediate(T3, A0, target::TypedData::HeaderSize() - 1);
__ StoreInternalPointer(
A0, FieldAddress(A0, target::PointerBase::data_offset()), T3);
if (__ Supports(RV_V) && element_size <= 8) {
Register remaining_length = TMP;
Register vl = TMP2;
__ SmiUntag(remaining_length, AllocateTypedDataArrayABI::kLengthReg);
Label loop;
__ Bind(&loop);
switch (element_size) {
case 1:
__ vsetvli(vl, remaining_length, e8, m8, ta, ma);
__ vmvvx(V0, ZR);
__ vse8v(V0, Address(T3));
break;
case 2:
__ vsetvli(vl, remaining_length, e16, m8, ta, ma);
__ vmvvx(V0, ZR);
__ vse16v(V0, Address(T3));
break;
case 4:
__ vsetvli(vl, remaining_length, e32, m8, ta, ma);
__ vmvvx(V0, ZR);
__ vse32v(V0, Address(T3));
break;
case 8:
__ vsetvli(vl, remaining_length, e64, m8, ta, ma);
__ vmvvx(V0, ZR);
__ vse64v(V0, Address(T3));
break;
default:
UNREACHABLE();
}
__ sub(remaining_length, remaining_length, vl);
__ AddShifted(T3, T3, vl, scale_shift); // Bump dest.
__ bnez(remaining_length, &loop);
} else {
Label loop;
__ Bind(&loop);
for (intptr_t offset = 0; offset < target::kObjectAlignment;
offset += target::kWordSize) {
__ sx(ZR, Address(T3, offset));
}
// Safe to only check every kObjectAlignment bytes instead of each word.
ASSERT(kAllocationRedZoneSize >= target::kObjectAlignment);
__ addi(T3, T3, target::kObjectAlignment);
__ bltu(T3, T4, &loop);
__ WriteAllocationCanary(T4); // Fix overshoot.
}
__ Ret();
__ Bind(&call_runtime);
}
__ EnterStubFrame();
__ PushRegister(ZR); // Result slot.
__ PushImmediate(target::ToRawSmi(cid)); // Cid
__ PushRegister(AllocateTypedDataArrayABI::kLengthReg); // Array length
__ CallRuntime(kAllocateTypedDataRuntimeEntry, 2);
__ Drop(2); // Drop arguments.
__ PopRegister(AllocateTypedDataArrayABI::kResultReg);
__ LeaveStubFrame();
__ Ret();
}
} // namespace compiler
} // namespace dart
#endif // defined(TARGET_ARCH_RISCV)
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