mirror of
https://github.com/dart-lang/sdk
synced 2024-09-19 20:51:50 +00:00
3fa5667c1a
BARRIER_MASK requires 8 low bits and HEAP_BASE requires 32 high bits. Combine them into a single register HEAP_BITS, and use ARM's shifted operands to continue accessing the relevant bits in a single instruction. TEST=ci Change-Id: I5a4cd43fec2d19615239ec5cec2ac282d17c461c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/198100 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Liam Appelbe <liama@google.com>
96 lines
4 KiB
C++
96 lines
4 KiB
C++
// Copyright (c) 2014, 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"
|
|
#if defined(TARGET_ARCH_ARM64)
|
|
|
|
#include "vm/runtime_entry.h"
|
|
|
|
#include "vm/simulator.h"
|
|
#include "vm/stub_code.h"
|
|
|
|
#if !defined(DART_PRECOMPILED_RUNTIME)
|
|
#include "vm/compiler/assembler/assembler.h"
|
|
#endif // !defined(DART_PRECOMPILED_RUNTIME)
|
|
|
|
namespace dart {
|
|
|
|
#define __ assembler->
|
|
|
|
uword RuntimeEntry::GetEntryPoint() const {
|
|
// Compute the effective address. When running under the simulator,
|
|
// this is a redirection address that forces the simulator to call
|
|
// into the runtime system.
|
|
uword entry = reinterpret_cast<uword>(function());
|
|
#if defined(USING_SIMULATOR)
|
|
// Redirection to leaf runtime calls supports a maximum of 4 arguments passed
|
|
// in registers (maximum 2 double arguments for leaf float runtime calls).
|
|
ASSERT(argument_count() >= 0);
|
|
ASSERT(!is_leaf() || (!is_float() && (argument_count() <= 4)) ||
|
|
(argument_count() <= 2));
|
|
Simulator::CallKind call_kind =
|
|
is_leaf() ? (is_float() ? Simulator::kLeafFloatRuntimeCall
|
|
: Simulator::kLeafRuntimeCall)
|
|
: Simulator::kRuntimeCall;
|
|
entry =
|
|
Simulator::RedirectExternalReference(entry, call_kind, argument_count());
|
|
#endif
|
|
return entry;
|
|
}
|
|
|
|
#if !defined(DART_PRECOMPILED_RUNTIME)
|
|
// Generate code to call into the stub which will call the runtime
|
|
// function. Input for the stub is as follows:
|
|
// SP : points to the arguments and return value array.
|
|
// R5 : address of the runtime function to call.
|
|
// R4 : number of arguments to the call.
|
|
void RuntimeEntry::CallInternal(const RuntimeEntry* runtime_entry,
|
|
compiler::Assembler* assembler,
|
|
intptr_t argument_count) {
|
|
if (runtime_entry->is_leaf()) {
|
|
ASSERT(argument_count == runtime_entry->argument_count());
|
|
// Since we are entering C++ code, we must restore the C stack pointer from
|
|
// the stack limit to an aligned value nearer to the top of the stack.
|
|
// We cache the Dart stack pointer and the stack limit in callee-saved
|
|
// registers, then align and call, restoring CSP and SP on return from the
|
|
// call.
|
|
// This sequence may occur in an intrinsic, so don't use registers an
|
|
// intrinsic must preserve.
|
|
COMPILE_ASSERT(kCallLeafRuntimeCalleeSaveScratch1 != CODE_REG);
|
|
COMPILE_ASSERT(kCallLeafRuntimeCalleeSaveScratch2 != CODE_REG);
|
|
COMPILE_ASSERT(kCallLeafRuntimeCalleeSaveScratch1 != ARGS_DESC_REG);
|
|
COMPILE_ASSERT(kCallLeafRuntimeCalleeSaveScratch2 != ARGS_DESC_REG);
|
|
__ mov(kCallLeafRuntimeCalleeSaveScratch1, CSP);
|
|
__ mov(kCallLeafRuntimeCalleeSaveScratch2, SP);
|
|
__ ReserveAlignedFrameSpace(0);
|
|
__ mov(CSP, SP);
|
|
__ ldr(TMP,
|
|
compiler::Address(THR, Thread::OffsetFromThread(runtime_entry)));
|
|
__ str(TMP, compiler::Address(THR, Thread::vm_tag_offset()));
|
|
__ blr(TMP);
|
|
__ LoadImmediate(TMP, VMTag::kDartTagId);
|
|
__ str(TMP, compiler::Address(THR, Thread::vm_tag_offset()));
|
|
__ mov(SP, kCallLeafRuntimeCalleeSaveScratch2);
|
|
__ mov(CSP, kCallLeafRuntimeCalleeSaveScratch1);
|
|
COMPILE_ASSERT(IsAbiPreservedRegister(THR));
|
|
COMPILE_ASSERT(IsAbiPreservedRegister(PP));
|
|
COMPILE_ASSERT(IsAbiPreservedRegister(NULL_REG));
|
|
COMPILE_ASSERT(IsAbiPreservedRegister(HEAP_BITS));
|
|
COMPILE_ASSERT(IsAbiPreservedRegister(DISPATCH_TABLE_REG));
|
|
// These registers must be preserved by the runtime functions, otherwise
|
|
// we'd need to restore them here.
|
|
} else {
|
|
// Argument count is not checked here, but in the runtime entry for a more
|
|
// informative error message.
|
|
__ ldr(R5, compiler::Address(THR, Thread::OffsetFromThread(runtime_entry)));
|
|
__ LoadImmediate(R4, argument_count);
|
|
__ BranchLinkToRuntime();
|
|
}
|
|
}
|
|
#endif // !defined(DART_PRECOMPILED_RUNTIME)
|
|
|
|
} // namespace dart
|
|
|
|
#endif // defined TARGET_ARCH_ARM64
|