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2125ee9a37
Review URL: https://codereview.chromium.org//13094015 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@20539 260f80e4-7a28-3924-810f-c04153c831b5
122 lines
3 KiB
C++
122 lines
3 KiB
C++
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/globals.h" // Needed here to get TARGET_ARCH_MIPS.
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#if defined(TARGET_ARCH_MIPS)
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#include "vm/constants_mips.h"
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#include "vm/instructions.h"
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#include "vm/object.h"
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namespace dart {
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CallPattern::CallPattern(uword pc, const Code& code)
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: end_(reinterpret_cast<uword*>(pc)),
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target_address_pool_index_(-1),
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args_desc_load_end_(-1),
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args_desc_pool_index_(-1),
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ic_data_load_end_(-1),
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ic_data_pool_index_(-1),
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object_pool_(Array::Handle(code.ObjectPool())) {
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ASSERT(code.ContainsInstructionAt(pc));
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ASSERT(Back(2) == 0x0020f809); // Last instruction: jalr RA, TMP(=R1)
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Register reg;
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// First end is 0 so that we begin from the delay slot of the jalr.
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args_desc_load_end_ =
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DecodeLoadWordFromPool(2, ®, &target_address_pool_index_);
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ASSERT(reg == TMP);
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}
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uword CallPattern::Back(int n) const {
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ASSERT(n > 0);
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return *(end_ - n);
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}
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int CallPattern::DecodeLoadWordFromPool(int end, Register* reg, int* index) {
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ASSERT(end > 0);
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uword i = Back(++end);
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Instr* instr = Instr::At(reinterpret_cast<uword>(&i));
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int offset = 0;
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if ((instr->OpcodeField() == LW) && (instr->RsField() == PP)) {
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offset = instr->SImmField();
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*reg = instr->RtField();
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} else {
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ASSERT(instr->OpcodeField() == LW);
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offset = instr->SImmField();
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*reg = instr->RtField();
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i = Back(++end);
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instr = Instr::At(reinterpret_cast<uword>(&i));
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ASSERT(instr->OpcodeField() == SPECIAL);
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ASSERT(instr->FunctionField() == ADDU);
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ASSERT(instr->RdField() == *reg);
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ASSERT(instr->RsField() == *reg);
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ASSERT(instr->RtField() == PP);
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i = Back(++end);
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instr = Instr::At(reinterpret_cast<uword>(&i));
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ASSERT(instr->RtField() == *reg);
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// Offset is signed, so add the upper 16 bits.
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offset += (instr->UImmField() << 16);
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}
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offset += kHeapObjectTag;
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ASSERT(Utils::IsAligned(offset, 4));
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*index = (offset - Array::data_offset())/4;
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return end;
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}
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RawICData* CallPattern::IcData() {
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UNIMPLEMENTED();
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return NULL;
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}
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RawArray* CallPattern::ArgumentsDescriptor() {
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UNIMPLEMENTED();
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return NULL;
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}
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uword CallPattern::TargetAddress() const {
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ASSERT(target_address_pool_index_ >= 0);
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const Object& target_address =
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Object::Handle(object_pool_.At(target_address_pool_index_));
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ASSERT(target_address.IsSmi());
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// The address is stored in the object array as a RawSmi.
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return reinterpret_cast<uword>(target_address.raw());
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}
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void CallPattern::SetTargetAddress(uword target_address) const {
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UNIMPLEMENTED();
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}
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JumpPattern::JumpPattern(uword pc) : pc_(pc) { }
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bool JumpPattern::IsValid() const {
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UNIMPLEMENTED();
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return false;
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}
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uword JumpPattern::TargetAddress() const {
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UNIMPLEMENTED();
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return 0;
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}
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void JumpPattern::SetTargetAddress(uword target_address) const {
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UNIMPLEMENTED();
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_MIPS
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