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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "base/logging.h"
#include "base/stringprintf.h"
#include "compiler_ir.h"
#include "dex/dataflow_iterator-inl.h"
#include "dex_flags.h"
#include "driver/dex_compilation_unit.h"
namespace art {
bool MIRGraph::SetFp(int index, bool is_fp) {
bool change = false;
if (is_fp && !reg_location_[index].fp) {
reg_location_[index].fp = true;
reg_location_[index].defined = true;
change = true;
}
return change;
}
bool MIRGraph::SetFp(int index) {
bool change = false;
if (!reg_location_[index].fp) {
reg_location_[index].fp = true;
reg_location_[index].defined = true;
change = true;
}
return change;
}
bool MIRGraph::SetCore(int index, bool is_core) {
bool change = false;
if (is_core && !reg_location_[index].defined) {
reg_location_[index].core = true;
reg_location_[index].defined = true;
change = true;
}
return change;
}
bool MIRGraph::SetCore(int index) {
bool change = false;
if (!reg_location_[index].defined) {
reg_location_[index].core = true;
reg_location_[index].defined = true;
change = true;
}
return change;
}
bool MIRGraph::SetRef(int index, bool is_ref) {
bool change = false;
if (is_ref && !reg_location_[index].defined) {
reg_location_[index].ref = true;
reg_location_[index].defined = true;
change = true;
}
return change;
}
bool MIRGraph::SetRef(int index) {
bool change = false;
if (!reg_location_[index].defined) {
reg_location_[index].ref = true;
reg_location_[index].defined = true;
change = true;
}
return change;
}
bool MIRGraph::SetWide(int index, bool is_wide) {
bool change = false;
if (is_wide && !reg_location_[index].wide) {
reg_location_[index].wide = true;
change = true;
}
return change;
}
bool MIRGraph::SetWide(int index) {
bool change = false;
if (!reg_location_[index].wide) {
reg_location_[index].wide = true;
change = true;
}
return change;
}
bool MIRGraph::SetHigh(int index, bool is_high) {
bool change = false;
if (is_high && !reg_location_[index].high_word) {
reg_location_[index].high_word = true;
change = true;
}
return change;
}
bool MIRGraph::SetHigh(int index) {
bool change = false;
if (!reg_location_[index].high_word) {
reg_location_[index].high_word = true;
change = true;
}
return change;
}
/*
* Infer types and sizes. We don't need to track change on sizes,
* as it doesn't propagate. We're guaranteed at least one pass through
* the cfg.
*/
bool MIRGraph::InferTypeAndSize(BasicBlock* bb, MIR* mir, bool changed) {
SSARepresentation *ssa_rep = mir->ssa_rep;
/*
* The dex bytecode definition does not explicitly outlaw the definition of the same
* virtual register to be used in both a 32-bit and 64-bit pair context. However, dx
* does not generate this pattern (at least recently). Further, in the next revision of
* dex, we will forbid this. To support the few cases in the wild, detect this pattern
* and punt to the interpreter.
*/
bool type_mismatch = false;
if (ssa_rep) {
uint64_t attrs = GetDataFlowAttributes(mir);
const int* uses = ssa_rep->uses;
const int* defs = ssa_rep->defs;
// Handle defs
if (attrs & DF_DA) {
if (attrs & DF_CORE_A) {
changed |= SetCore(defs[0]);
}
if (attrs & DF_REF_A) {
changed |= SetRef(defs[0]);
}
if (attrs & DF_A_WIDE) {
reg_location_[defs[0]].wide = true;
reg_location_[defs[1]].wide = true;
reg_location_[defs[1]].high_word = true;
DCHECK_EQ(SRegToVReg(defs[0])+1,
SRegToVReg(defs[1]));
}
}
// Handles uses
int next = 0;
if (attrs & DF_UA) {
if (attrs & DF_CORE_A) {
changed |= SetCore(uses[next]);
}
if (attrs & DF_REF_A) {
changed |= SetRef(uses[next]);
}
if (attrs & DF_A_WIDE) {
reg_location_[uses[next]].wide = true;
reg_location_[uses[next + 1]].wide = true;
reg_location_[uses[next + 1]].high_word = true;
DCHECK_EQ(SRegToVReg(uses[next])+1,
SRegToVReg(uses[next + 1]));
next += 2;
} else {
type_mismatch |= reg_location_[uses[next]].wide;
next++;
}
}
if (attrs & DF_UB) {
if (attrs & DF_CORE_B) {
changed |= SetCore(uses[next]);
}
if (attrs & DF_REF_B) {
changed |= SetRef(uses[next]);
}
if (attrs & DF_B_WIDE) {
reg_location_[uses[next]].wide = true;
reg_location_[uses[next + 1]].wide = true;
reg_location_[uses[next + 1]].high_word = true;
DCHECK_EQ(SRegToVReg(uses[next])+1,
SRegToVReg(uses[next + 1]));
next += 2;
} else {
type_mismatch |= reg_location_[uses[next]].wide;
next++;
}
}
if (attrs & DF_UC) {
if (attrs & DF_CORE_C) {
changed |= SetCore(uses[next]);
}
if (attrs & DF_REF_C) {
changed |= SetRef(uses[next]);
}
if (attrs & DF_C_WIDE) {
reg_location_[uses[next]].wide = true;
reg_location_[uses[next + 1]].wide = true;
reg_location_[uses[next + 1]].high_word = true;
DCHECK_EQ(SRegToVReg(uses[next])+1,
SRegToVReg(uses[next + 1]));
} else {
type_mismatch |= reg_location_[uses[next]].wide;
}
}
// Special-case return handling
if ((mir->dalvikInsn.opcode == Instruction::RETURN) ||
(mir->dalvikInsn.opcode == Instruction::RETURN_WIDE) ||
(mir->dalvikInsn.opcode == Instruction::RETURN_OBJECT)) {
switch (cu_->shorty[0]) {
case 'I':
type_mismatch |= reg_location_[uses[0]].wide;
changed |= SetCore(uses[0]);
break;
case 'J':
changed |= SetCore(uses[0]);
changed |= SetCore(uses[1]);
reg_location_[uses[0]].wide = true;
reg_location_[uses[1]].wide = true;
reg_location_[uses[1]].high_word = true;
break;
case 'F':
type_mismatch |= reg_location_[uses[0]].wide;
changed |= SetFp(uses[0]);
break;
case 'D':
changed |= SetFp(uses[0]);
changed |= SetFp(uses[1]);
reg_location_[uses[0]].wide = true;
reg_location_[uses[1]].wide = true;
reg_location_[uses[1]].high_word = true;
break;
case 'L':
type_mismatch |= reg_location_[uses[0]].wide;
changed |= SetRef(uses[0]);
break;
default: break;
}
}
// Special-case handling for format 35c/3rc invokes
Instruction::Code opcode = mir->dalvikInsn.opcode;
int flags = MIR::DecodedInstruction::IsPseudoMirOp(opcode) ?
0 : mir->dalvikInsn.FlagsOf();
if ((flags & Instruction::kInvoke) &&
(attrs & (DF_FORMAT_35C | DF_FORMAT_3RC))) {
DCHECK_EQ(next, 0);
const auto& lowering_info = GetMethodLoweringInfo(mir);
const char* shorty = GetShortyFromMethodReference(lowering_info.GetTargetMethod());
// Handle result type if floating point
if ((shorty[0] == 'F') || (shorty[0] == 'D')) {
MIR* move_result_mir = FindMoveResult(bb, mir);
// Result might not be used at all, so no move-result
if (move_result_mir && (move_result_mir->dalvikInsn.opcode !=
Instruction::MOVE_RESULT_OBJECT)) {
SSARepresentation* tgt_rep = move_result_mir->ssa_rep;
DCHECK(tgt_rep != NULL);
tgt_rep->fp_def[0] = true;
changed |= SetFp(tgt_rep->defs[0]);
if (shorty[0] == 'D') {
tgt_rep->fp_def[1] = true;
changed |= SetFp(tgt_rep->defs[1]);
}
}
}
int num_uses = mir->dalvikInsn.vA;
// If this is a non-static invoke, mark implicit "this"
if (!IsInstructionInvokeStatic(mir->dalvikInsn.opcode)) {
reg_location_[uses[next]].defined = true;
reg_location_[uses[next]].ref = true;
type_mismatch |= reg_location_[uses[next]].wide;
next++;
}
uint32_t cpos = 1;
if (strlen(shorty) > 1) {
for (int i = next; i < num_uses;) {
DCHECK_LT(cpos, strlen(shorty));
switch (shorty[cpos++]) {
case 'D':
ssa_rep->fp_use[i] = true;
ssa_rep->fp_use[i+1] = true;
reg_location_[uses[i]].wide = true;
reg_location_[uses[i+1]].wide = true;
reg_location_[uses[i+1]].high_word = true;
DCHECK_EQ(SRegToVReg(uses[i])+1, SRegToVReg(uses[i+1]));
i++;
break;
case 'J':
reg_location_[uses[i]].wide = true;
reg_location_[uses[i+1]].wide = true;
reg_location_[uses[i+1]].high_word = true;
DCHECK_EQ(SRegToVReg(uses[i])+1, SRegToVReg(uses[i+1]));
changed |= SetCore(uses[i]);
i++;
break;
case 'F':
type_mismatch |= reg_location_[uses[i]].wide;
ssa_rep->fp_use[i] = true;
break;
case 'L':
type_mismatch |= reg_location_[uses[i]].wide;
changed |= SetRef(uses[i]);
break;
default:
type_mismatch |= reg_location_[uses[i]].wide;
changed |= SetCore(uses[i]);
break;
}
i++;
}
}
}
for (int i = 0; ssa_rep->fp_use && i< ssa_rep->num_uses; i++) {
if (ssa_rep->fp_use[i]) {
changed |= SetFp(uses[i]);
}
}
for (int i = 0; ssa_rep->fp_def && i< ssa_rep->num_defs; i++) {
if (ssa_rep->fp_def[i]) {
changed |= SetFp(defs[i]);
}
}
// Special-case handling for moves & Phi
if (attrs & (DF_IS_MOVE | DF_NULL_TRANSFER_N)) {
/*
* If any of our inputs or outputs is defined, set all.
* Some ugliness related to Phi nodes and wide values.
* The Phi set will include all low words or all high
* words, so we have to treat them specially.
*/
bool is_phi = (static_cast<int>(mir->dalvikInsn.opcode) == kMirOpPhi);
RegLocation rl_temp = reg_location_[defs[0]];
bool defined_fp = rl_temp.defined && rl_temp.fp;
bool defined_core = rl_temp.defined && rl_temp.core;
bool defined_ref = rl_temp.defined && rl_temp.ref;
bool is_wide = rl_temp.wide || ((attrs & DF_A_WIDE) != 0);
bool is_high = is_phi && rl_temp.wide && rl_temp.high_word;
for (int i = 0; i < ssa_rep->num_uses; i++) {
rl_temp = reg_location_[uses[i]];
defined_fp |= rl_temp.defined && rl_temp.fp;
defined_core |= rl_temp.defined && rl_temp.core;
defined_ref |= rl_temp.defined && rl_temp.ref;
is_wide |= rl_temp.wide;
is_high |= is_phi && rl_temp.wide && rl_temp.high_word;
}
/*
* We don't normally expect to see a Dalvik register definition used both as a
* floating point and core value, though technically it could happen with constants.
* Until we have proper typing, detect this situation and disable register promotion
* (which relies on the distinction between core a fp usages).
*/
if ((defined_fp && (defined_core | defined_ref)) &&
((cu_->disable_opt & (1 << kPromoteRegs)) == 0)) {
LOG(WARNING) << PrettyMethod(cu_->method_idx, *cu_->dex_file)
<< " op at block " << bb->id
<< " has both fp and core/ref uses for same def.";
cu_->disable_opt |= (1 << kPromoteRegs);
}
changed |= SetFp(defs[0], defined_fp);
changed |= SetCore(defs[0], defined_core);
changed |= SetRef(defs[0], defined_ref);
changed |= SetWide(defs[0], is_wide);
changed |= SetHigh(defs[0], is_high);
if (attrs & DF_A_WIDE) {
changed |= SetWide(defs[1]);
changed |= SetHigh(defs[1]);
}
bool has_ins = (GetNumOfInVRs() > 0);
for (int i = 0; i < ssa_rep->num_uses; i++) {
if (has_ins && IsInVReg(uses[i])) {
// NB: The SSA name for the first def of an in-reg will be the same as
// the reg's actual name.
if (!reg_location_[uses[i]].fp && defined_fp) {
// If we were about to infer that this first def of an in-reg is a float
// when it wasn't previously (because float/int is set during SSA initialization),
// do not allow this to happen.
continue;
}
}
changed |= SetFp(uses[i], defined_fp);
changed |= SetCore(uses[i], defined_core);
changed |= SetRef(uses[i], defined_ref);
changed |= SetWide(uses[i], is_wide);
changed |= SetHigh(uses[i], is_high);
}
if (attrs & DF_A_WIDE) {
DCHECK_EQ(ssa_rep->num_uses, 2);
changed |= SetWide(uses[1]);
changed |= SetHigh(uses[1]);
}
}
}
if (type_mismatch) {
LOG(WARNING) << "Deprecated dex type mismatch, interpreting "
<< PrettyMethod(cu_->method_idx, *cu_->dex_file);
LOG(INFO) << "@ 0x" << std::hex << mir->offset;
SetPuntToInterpreter(true);
}
return changed;
}
static const char* storage_name[] = {" Frame ", "PhysReg", " CompilerTemp "};
void MIRGraph::DumpRegLocTable(RegLocation* table, int count) {
for (int i = 0; i < count; i++) {
LOG(INFO) << StringPrintf("Loc[%02d] : %s, %c %c %c %c %c %c 0x%04x S%d",
table[i].orig_sreg, storage_name[table[i].location],
table[i].wide ? 'W' : 'N', table[i].defined ? 'D' : 'U',
table[i].fp ? 'F' : table[i].ref ? 'R' :'C',
table[i].is_const ? 'c' : 'n',
table[i].high_word ? 'H' : 'L', table[i].home ? 'h' : 't',
table[i].reg.GetRawBits(),
table[i].s_reg_low);
}
}
// FIXME - will likely need to revisit all uses of this.
static const RegLocation fresh_loc = {kLocDalvikFrame, 0, 0, 0, 0, 0, 0, 0, 0,
RegStorage(), INVALID_SREG, INVALID_SREG};
void MIRGraph::InitRegLocations() {
// Allocate the location map. We also include the maximum possible temps because
// the temp allocation initializes reg location as well (in order to deal with
// case when it will be called after this pass).
int max_regs = GetNumSSARegs() + GetMaxPossibleCompilerTemps();
RegLocation* loc = arena_->AllocArray<RegLocation>(max_regs, kArenaAllocRegAlloc);
for (int i = 0; i < GetNumSSARegs(); i++) {
loc[i] = fresh_loc;
loc[i].s_reg_low = i;
loc[i].is_const = false; // Constants will be marked by constant propagation pass later.
loc[i].wide = false;
}
/* Treat Method* as a normal reference */
int method_sreg = GetMethodSReg();
loc[method_sreg].ref = true;
loc[method_sreg].location = kLocCompilerTemp;
loc[method_sreg].defined = true;
reg_location_ = loc;
int num_regs = GetNumOfCodeVRs();
/* Add types of incoming arguments based on signature */
int num_ins = GetNumOfInVRs();
if (num_ins > 0) {
int s_reg = num_regs - num_ins;
if ((cu_->access_flags & kAccStatic) == 0) {
// For non-static, skip past "this"
reg_location_[s_reg].defined = true;
reg_location_[s_reg].ref = true;
s_reg++;
}
const char* shorty = cu_->shorty;
int shorty_len = strlen(shorty);
for (int i = 1; i < shorty_len; i++) {
switch (shorty[i]) {
case 'D':
reg_location_[s_reg].wide = true;
reg_location_[s_reg+1].high_word = true;
reg_location_[s_reg+1].fp = true;
DCHECK_EQ(SRegToVReg(s_reg)+1, SRegToVReg(s_reg+1));
reg_location_[s_reg].fp = true;
reg_location_[s_reg].defined = true;
s_reg++;
break;
case 'J':
reg_location_[s_reg].wide = true;
reg_location_[s_reg+1].high_word = true;
DCHECK_EQ(SRegToVReg(s_reg)+1, SRegToVReg(s_reg+1));
reg_location_[s_reg].core = true;
reg_location_[s_reg].defined = true;
s_reg++;
break;
case 'F':
reg_location_[s_reg].fp = true;
reg_location_[s_reg].defined = true;
break;
case 'L':
reg_location_[s_reg].ref = true;
reg_location_[s_reg].defined = true;
break;
default:
reg_location_[s_reg].core = true;
reg_location_[s_reg].defined = true;
break;
}
s_reg++;
}
}
}
/*
* Set the s_reg_low field to refer to the pre-SSA name of the
* base Dalvik virtual register. Once we add a better register
* allocator, remove this remapping.
*/
void MIRGraph::RemapRegLocations() {
for (int i = 0; i < GetNumSSARegs(); i++) {
int orig_sreg = reg_location_[i].s_reg_low;
reg_location_[i].orig_sreg = orig_sreg;
reg_location_[i].s_reg_low = SRegToVReg(orig_sreg);
}
}
} // namespace art