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Unified Diff: src/mips/macro-assembler-mips.cc

Issue 6709022: Re-establish mips basic infrastructure. (Closed) Base URL: git://github.com/v8/v8.git@master
Patch Set: Updated per comments, and rebased on r7312. Created 9 years, 9 months ago
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« src/mips/macro-assembler-mips.h ('K') | « src/mips/macro-assembler-mips.h ('k') | src/mips/regexp-macro-assembler-mips.h » ('j') | src/mips/simulator-mips.cc » ('J')
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Index: src/mips/macro-assembler-mips.cc
diff --git a/src/mips/macro-assembler-mips.cc b/src/mips/macro-assembler-mips.cc
index 02ece8c56ca8954ee8b9771975e21cf9b70b971e..5707743820b94e9d3a364ec0bc99a0bb90e74948 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -1,4 +1,4 @@
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
@@ -25,7 +25,7 @@
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
+#include <limits.h> // For LONG_MIN, LONG_MAX
#include "v8.h"
@@ -41,68 +41,97 @@ namespace internal {
MacroAssembler::MacroAssembler(void* buffer, int size)
: Assembler(buffer, size),
- unresolved_(0),
generating_stub_(false),
allow_stub_calls_(true),
- code_object_(Heap::undefined_value()) {
+ code_object_(HEAP->undefined_value()) {
}
+// Arguments macros
+#define COND_TYPED_ARGS Condition cond, Register r1, const Operand& r2
+#define COND_ARGS cond, r1, r2
-void MacroAssembler::Jump(Register target, Condition cond,
- Register r1, const Operand& r2) {
- Jump(Operand(target), cond, r1, r2);
-}
-
-
-void MacroAssembler::Jump(intptr_t target, RelocInfo::Mode rmode,
- Condition cond, Register r1, const Operand& r2) {
- Jump(Operand(target, rmode), cond, r1, r2);
+#define REGISTER_TARGET_BODY(Name) \
+void MacroAssembler::Name(Register target, \
+ bool ProtectBranchDelaySlot) { \
+ Name(Operand(target), ProtectBranchDelaySlot); \
+} \
+void MacroAssembler::Name(Register target, COND_TYPED_ARGS, \
+ bool ProtectBranchDelaySlot) { \
+ Name(Operand(target), COND_ARGS, ProtectBranchDelaySlot); \
}
-void MacroAssembler::Jump(byte* target, RelocInfo::Mode rmode,
- Condition cond, Register r1, const Operand& r2) {
- ASSERT(!RelocInfo::IsCodeTarget(rmode));
- Jump(reinterpret_cast<intptr_t>(target), rmode, cond, r1, r2);
+#define INT_PTR_TARGET_BODY(Name) \
+void MacroAssembler::Name(intptr_t target, RelocInfo::Mode rmode, \
+ bool ProtectBranchDelaySlot) { \
+ Name(Operand(target, rmode), ProtectBranchDelaySlot); \
+} \
+void MacroAssembler::Name(intptr_t target, \
+ RelocInfo::Mode rmode, \
+ COND_TYPED_ARGS, \
+ bool ProtectBranchDelaySlot) { \
+ Name(Operand(target, rmode), COND_ARGS, ProtectBranchDelaySlot); \
}
-void MacroAssembler::Jump(Handle<Code> code, RelocInfo::Mode rmode,
- Condition cond, Register r1, const Operand& r2) {
- ASSERT(RelocInfo::IsCodeTarget(rmode));
- Jump(reinterpret_cast<intptr_t>(code.location()), rmode, cond);
+#define BYTE_PTR_TARGET_BODY(Name) \
+void MacroAssembler::Name(byte* target, RelocInfo::Mode rmode, \
+ bool ProtectBranchDelaySlot) { \
+ Name(reinterpret_cast<intptr_t>(target), rmode, ProtectBranchDelaySlot); \
+} \
+void MacroAssembler::Name(byte* target, \
+ RelocInfo::Mode rmode, \
+ COND_TYPED_ARGS, \
+ bool ProtectBranchDelaySlot) { \
+ Name(reinterpret_cast<intptr_t>(target), \
+ rmode, \
+ COND_ARGS, \
+ ProtectBranchDelaySlot); \
}
-void MacroAssembler::Call(Register target,
- Condition cond, Register r1, const Operand& r2) {
- Call(Operand(target), cond, r1, r2);
+#define CODE_TARGET_BODY(Name) \
+void MacroAssembler::Name(Handle<Code> target, RelocInfo::Mode rmode, \
+ bool ProtectBranchDelaySlot) { \
+ Name(reinterpret_cast<intptr_t>(target.location()), \
+ rmode, ProtectBranchDelaySlot); \
+} \
+void MacroAssembler::Name(Handle<Code> target, \
+ RelocInfo::Mode rmode, \
+ COND_TYPED_ARGS, \
+ bool ProtectBranchDelaySlot) { \
+ Name(reinterpret_cast<intptr_t>(target.location()), \
+ rmode, \
+ COND_ARGS, \
+ ProtectBranchDelaySlot); \
}
-void MacroAssembler::Call(intptr_t target, RelocInfo::Mode rmode,
- Condition cond, Register r1, const Operand& r2) {
- Call(Operand(target, rmode), cond, r1, r2);
-}
-
+REGISTER_TARGET_BODY(Jump)
+REGISTER_TARGET_BODY(Call)
+INT_PTR_TARGET_BODY(Jump)
+INT_PTR_TARGET_BODY(Call)
+BYTE_PTR_TARGET_BODY(Jump)
+BYTE_PTR_TARGET_BODY(Call)
+CODE_TARGET_BODY(Jump)
+CODE_TARGET_BODY(Call)
-void MacroAssembler::Call(byte* target, RelocInfo::Mode rmode,
- Condition cond, Register r1, const Operand& r2) {
- ASSERT(!RelocInfo::IsCodeTarget(rmode));
- Call(reinterpret_cast<intptr_t>(target), rmode, cond, r1, r2);
-}
+#undef COND_TYPED_ARGS
+#undef COND_ARGS
+#undef REGISTER_TARGET_BODY
+#undef BYTE_PTR_TARGET_BODY
+#undef CODE_TARGET_BODY
-void MacroAssembler::Call(Handle<Code> code, RelocInfo::Mode rmode,
- Condition cond, Register r1, const Operand& r2) {
- ASSERT(RelocInfo::IsCodeTarget(rmode));
- Call(reinterpret_cast<intptr_t>(code.location()), rmode, cond, r1, r2);
+void MacroAssembler::Ret(bool ProtectBranchDelaySlot) {
+ Jump(Operand(ra), ProtectBranchDelaySlot);
}
-void MacroAssembler::Ret(Condition cond, Register r1, const Operand& r2) {
- Jump(Operand(ra), cond, r1, r2);
+void MacroAssembler::Ret(Condition cond, Register r1, const Operand& r2,
+ bool ProtectBranchDelaySlot) {
+ Jump(Operand(ra), cond, r1, r2, ProtectBranchDelaySlot);
}
@@ -111,51 +140,248 @@ void MacroAssembler::LoadRoot(Register destination,
lw(destination, MemOperand(s6, index << kPointerSizeLog2));
}
+
void MacroAssembler::LoadRoot(Register destination,
Heap::RootListIndex index,
Condition cond,
Register src1, const Operand& src2) {
- Branch(NegateCondition(cond), 2, src1, src2);
+ Branch(2, NegateCondition(cond), src1, src2);
lw(destination, MemOperand(s6, index << kPointerSizeLog2));
}
-void MacroAssembler::RecordWrite(Register object, Register offset,
+void MacroAssembler::StoreRoot(Register source,
+ Heap::RootListIndex index) {
+ sw(source, MemOperand(s6, index << kPointerSizeLog2));
+}
+
+
+void MacroAssembler::StoreRoot(Register source,
+ Heap::RootListIndex index,
+ Condition cond,
+ Register src1, const Operand& src2) {
+ Branch(2, NegateCondition(cond), src1, src2);
+ sw(source, MemOperand(s6, index << kPointerSizeLog2));
+}
+
+
+void MacroAssembler::RecordWriteHelper(Register object,
+ Register address,
+ Register scratch) {
+ if (FLAG_debug_code) {
+ // Check that the object is not in new space.
+ Label not_in_new_space;
+ InNewSpace(object, scratch, ne, &not_in_new_space);
+ Abort("new-space object passed to RecordWriteHelper");
+ bind(&not_in_new_space);
+ }
+
+ // Calculate page address: Clear bits from 0 to kPageSizeBits.
+ if (mips32r2) {
+ Ins(object, zero_reg, 0, kPageSizeBits);
+ } else {
+ // The Ins macro is slow on r1, so use shifts instead.
+ srl(object, object, kPageSizeBits);
+ sll(object, object, kPageSizeBits);
+ }
+
+ // Calculate region number.
+ Ext(address, address, Page::kRegionSizeLog2,
+ kPageSizeBits - Page::kRegionSizeLog2);
+
+ // Mark region dirty.
+ lw(scratch, MemOperand(object, Page::kDirtyFlagOffset));
+ li(at, Operand(1));
+ sllv(at, at, address);
+ or_(scratch, scratch, at);
+ sw(scratch, MemOperand(object, Page::kDirtyFlagOffset));
+}
+
+
+void MacroAssembler::InNewSpace(Register object,
+ Register scratch,
+ Condition cc,
+ Label* branch) {
+ ASSERT(cc == eq || cc == ne);
+ And(scratch, object, Operand(ExternalReference::new_space_mask(isolate())));
+ Branch(branch, cc, scratch,
+ Operand(ExternalReference::new_space_start(isolate())));
+}
+
+
+// Will clobber 4 registers: object, scratch0, scratch1, at. The
+// register 'object' contains a heap object pointer. The heap object
+// tag is shifted away.
+void MacroAssembler::RecordWrite(Register object,
+ Operand offset,
+ Register scratch0,
+ Register scratch1) {
+ // The compiled code assumes that record write doesn't change the
+ // context register, so we check that none of the clobbered
+ // registers are cp.
+ ASSERT(!object.is(cp) && !scratch0.is(cp) && !scratch1.is(cp));
+
+ Label done;
+
+ // First, test that the object is not in the new space. We cannot set
+ // region marks for new space pages.
+ InNewSpace(object, scratch0, eq, &done);
+
+ // Add offset into the object.
+ Addu(scratch0, object, offset);
+
+ // Record the actual write.
+ RecordWriteHelper(object, scratch0, scratch1);
+
+ bind(&done);
+
+ // Clobber all input registers when running with the debug-code flag
+ // turned on to provoke errors.
+ if (FLAG_debug_code) {
+ li(object, Operand(BitCast<int32_t>(kZapValue)));
+ li(scratch0, Operand(BitCast<int32_t>(kZapValue)));
+ li(scratch1, Operand(BitCast<int32_t>(kZapValue)));
+ }
+}
+
+
+// Will clobber 4 registers: object, address, scratch, ip. The
+// register 'object' contains a heap object pointer. The heap object
+// tag is shifted away.
+void MacroAssembler::RecordWrite(Register object,
+ Register address,
Register scratch) {
- UNIMPLEMENTED_MIPS();
+ // The compiled code assumes that record write doesn't change the
+ // context register, so we check that none of the clobbered
+ // registers are cp.
+ ASSERT(!object.is(cp) && !address.is(cp) && !scratch.is(cp));
+
+ Label done;
+
+ // First, test that the object is not in the new space. We cannot set
+ // region marks for new space pages.
+ InNewSpace(object, scratch, eq, &done);
+
+ // Record the actual write.
+ RecordWriteHelper(object, address, scratch);
+
+ bind(&done);
+
+ // Clobber all input registers when running with the debug-code flag
+ // turned on to provoke errors.
+ if (FLAG_debug_code) {
+ li(object, Operand(BitCast<int32_t>(kZapValue)));
+ li(address, Operand(BitCast<int32_t>(kZapValue)));
+ li(scratch, Operand(BitCast<int32_t>(kZapValue)));
+ }
+}
+
+
+// -----------------------------------------------------------------------------
+// Allocation support
+
+
+void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
+ Register scratch,
+ Label* miss) {
+ Label same_contexts;
+
+ ASSERT(!holder_reg.is(scratch));
+ ASSERT(!holder_reg.is(at));
+ ASSERT(!scratch.is(at));
+
+ // Load current lexical context from the stack frame.
+ lw(scratch, MemOperand(fp, StandardFrameConstants::kContextOffset));
+ // In debug mode, make sure the lexical context is set.
+#ifdef DEBUG
+ Check(ne, "we should not have an empty lexical context",
+ scratch, Operand(zero_reg));
+#endif
+
+ // Load the global context of the current context.
+ int offset = Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize;
+ lw(scratch, FieldMemOperand(scratch, offset));
+ lw(scratch, FieldMemOperand(scratch, GlobalObject::kGlobalContextOffset));
+
+ // Check the context is a global context.
+ if (FLAG_debug_code) {
+ // TODO(119): Avoid push(holder_reg)/pop(holder_reg).
+ Push(holder_reg); // Temporarily save holder on the stack.
+ // Read the first word and compare to the global_context_map.
+ lw(holder_reg, FieldMemOperand(scratch, HeapObject::kMapOffset));
+ LoadRoot(at, Heap::kGlobalContextMapRootIndex);
+ Check(eq, "JSGlobalObject::global_context should be a global context.",
+ holder_reg, Operand(at));
+ Pop(holder_reg); // Restore holder.
+ }
+
+ // Check if both contexts are the same.
+ lw(at, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset));
+ Branch(&same_contexts, eq, scratch, Operand(at));
+
+ // Check the context is a global context.
+ if (FLAG_debug_code) {
+ // TODO(119): Avoid push(holder_reg)/pop(holder_reg).
+ Push(holder_reg); // Temporarily save holder on the stack.
+ mov(holder_reg, at); // Move at to its holding place.
+ LoadRoot(at, Heap::kNullValueRootIndex);
+ Check(ne, "JSGlobalProxy::context() should not be null.",
+ holder_reg, Operand(at));
+
+ lw(holder_reg, FieldMemOperand(holder_reg, HeapObject::kMapOffset));
+ LoadRoot(at, Heap::kGlobalContextMapRootIndex);
+ Check(eq, "JSGlobalObject::global_context should be a global context.",
+ holder_reg, Operand(at));
+ // Restore at is not needed. at is reloaded below.
+ Pop(holder_reg); // Restore holder.
+ // Restore at to holder's context.
+ lw(at, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset));
+ }
+
+ // Check that the security token in the calling global object is
+ // compatible with the security token in the receiving global
+ // object.
+ int token_offset = Context::kHeaderSize +
+ Context::SECURITY_TOKEN_INDEX * kPointerSize;
+
+ lw(scratch, FieldMemOperand(scratch, token_offset));
+ lw(at, FieldMemOperand(at, token_offset));
+ Branch(miss, ne, scratch, Operand(at));
+
+ bind(&same_contexts);
}
// ---------------------------------------------------------------------------
// Instruction macros
-void MacroAssembler::Add(Register rd, Register rs, const Operand& rt) {
+void MacroAssembler::Addu(Register rd, Register rs, const Operand& rt) {
if (rt.is_reg()) {
- add(rd, rs, rt.rm());
+ addu(rd, rs, rt.rm());
} else {
- if (is_int16(rt.imm32_) && !MustUseAt(rt.rmode_)) {
- addi(rd, rs, rt.imm32_);
+ if (is_int16(rt.imm32_) && !MustUseReg(rt.rmode_)) {
+ addiu(rd, rs, rt.imm32_);
} else {
// li handles the relocation.
ASSERT(!rs.is(at));
li(at, rt);
- add(rd, rs, at);
+ addu(rd, rs, at);
}
}
}
-void MacroAssembler::Addu(Register rd, Register rs, const Operand& rt) {
+void MacroAssembler::Subu(Register rd, Register rs, const Operand& rt) {
if (rt.is_reg()) {
- addu(rd, rs, rt.rm());
+ subu(rd, rs, rt.rm());
} else {
- if (is_int16(rt.imm32_) && !MustUseAt(rt.rmode_)) {
- addiu(rd, rs, rt.imm32_);
+ if (is_int16(rt.imm32_) && !MustUseReg(rt.rmode_)) {
+ addiu(rd, rs, -rt.imm32_); // No subiu instr, use addiu(x, y, -imm).
} else {
// li handles the relocation.
ASSERT(!rs.is(at));
li(at, rt);
- addu(rd, rs, at);
+ subu(rd, rs, at);
}
}
}
@@ -225,7 +451,7 @@ void MacroAssembler::And(Register rd, Register rs, const Operand& rt) {
if (rt.is_reg()) {
and_(rd, rs, rt.rm());
} else {
- if (is_int16(rt.imm32_) && !MustUseAt(rt.rmode_)) {
+ if (is_uint16(rt.imm32_) && !MustUseReg(rt.rmode_)) {
andi(rd, rs, rt.imm32_);
} else {
// li handles the relocation.
@@ -241,7 +467,7 @@ void MacroAssembler::Or(Register rd, Register rs, const Operand& rt) {
if (rt.is_reg()) {
or_(rd, rs, rt.rm());
} else {
- if (is_int16(rt.imm32_) && !MustUseAt(rt.rmode_)) {
+ if (is_uint16(rt.imm32_) && !MustUseReg(rt.rmode_)) {
ori(rd, rs, rt.imm32_);
} else {
// li handles the relocation.
@@ -257,7 +483,7 @@ void MacroAssembler::Xor(Register rd, Register rs, const Operand& rt) {
if (rt.is_reg()) {
xor_(rd, rs, rt.rm());
} else {
- if (is_int16(rt.imm32_) && !MustUseAt(rt.rmode_)) {
+ if (is_uint16(rt.imm32_) && !MustUseReg(rt.rmode_)) {
xori(rd, rs, rt.imm32_);
} else {
// li handles the relocation.
@@ -285,7 +511,7 @@ void MacroAssembler::Slt(Register rd, Register rs, const Operand& rt) {
if (rt.is_reg()) {
slt(rd, rs, rt.rm());
} else {
- if (is_int16(rt.imm32_) && !MustUseAt(rt.rmode_)) {
+ if (is_int16(rt.imm32_) && !MustUseReg(rt.rmode_)) {
slti(rd, rs, rt.imm32_);
} else {
// li handles the relocation.
@@ -301,7 +527,7 @@ void MacroAssembler::Sltu(Register rd, Register rs, const Operand& rt) {
if (rt.is_reg()) {
sltu(rd, rs, rt.rm());
} else {
- if (is_int16(rt.imm32_) && !MustUseAt(rt.rmode_)) {
+ if (is_uint16(rt.imm32_) && !MustUseReg(rt.rmode_)) {
sltiu(rd, rs, rt.imm32_);
} else {
// li handles the relocation.
@@ -313,18 +539,38 @@ void MacroAssembler::Sltu(Register rd, Register rs, const Operand& rt) {
}
-//------------Pseudo-instructions-------------
-
-void MacroAssembler::movn(Register rd, Register rt) {
- addiu(at, zero_reg, -1); // Fill at with ones.
- xor_(rd, rt, at);
+void MacroAssembler::Ror(Register rd, Register rs, const Operand& rt) {
+ if (mips32r2) {
+ if (rt.is_reg()) {
+ rotrv(rd, rs, rt.rm());
+ } else {
+ rotr(rd, rs, rt.imm32_);
+ }
+ } else {
+ if (rt.is_reg()) {
+ subu(at, zero_reg, rt.rm());
+ sllv(at, rs, at);
+ srlv(rd, rs, rt.rm());
+ or_(rd, rd, at);
+ } else {
+ if (rt.imm32_ == 0) {
+ srl(rd, rs, 0);
+ } else {
+ srl(at, rs, rt.imm32_);
+ sll(rd, rs, (0x20 - rt.imm32_) & 0x1f);
+ or_(rd, rd, at);
+ }
+ }
+ }
}
+//------------Pseudo-instructions-------------
+
void MacroAssembler::li(Register rd, Operand j, bool gen2instr) {
ASSERT(!j.is_reg());
-
- if (!MustUseAt(j.rmode_) && !gen2instr) {
+ BlockTrampolinePoolScope block_trampoline_pool(this);
+ if (!MustUseReg(j.rmode_) && !gen2instr) {
// Normal load of an immediate value which does not need Relocation Info.
if (is_int16(j.imm32_)) {
addiu(rd, zero_reg, j.imm32_);
@@ -336,8 +582,8 @@ void MacroAssembler::li(Register rd, Operand j, bool gen2instr) {
lui(rd, (HIMask & j.imm32_) >> 16);
ori(rd, rd, (LOMask & j.imm32_));
}
- } else if (MustUseAt(j.rmode_) || gen2instr) {
- if (MustUseAt(j.rmode_)) {
+ } else if (MustUseReg(j.rmode_) || gen2instr) {
+ if (MustUseReg(j.rmode_)) {
RecordRelocInfo(j.rmode_, j.imm32_);
}
// We need always the same number of instructions as we may need to patch
@@ -417,153 +663,774 @@ void MacroAssembler::MultiPopReversed(RegList regs) {
}
-// Emulated condtional branches do not emit a nop in the branch delay slot.
+void MacroAssembler::Ext(Register rt,
+ Register rs,
+ uint16_t pos,
+ uint16_t size) {
+ ASSERT(pos < 32);
+ ASSERT(pos + size < 32);
-// Trashes the at register if no scratch register is provided.
-void MacroAssembler::Branch(Condition cond, int16_t offset, Register rs,
- const Operand& rt, Register scratch) {
- Register r2 = no_reg;
- if (rt.is_reg()) {
- // We don't want any other register but scratch clobbered.
- ASSERT(!scratch.is(rs) && !scratch.is(rt.rm_));
- r2 = rt.rm_;
- } else if (cond != cc_always) {
- // We don't want any other register but scratch clobbered.
- ASSERT(!scratch.is(rs));
- r2 = scratch;
- li(r2, rt);
+ if (mips32r2) {
+ ext_(rt, rs, pos, size);
+ } else {
+ // Move rs to rt and shift it left then right to get the
+ // desired bitfield on the right side and zeroes on the left.
+ sll(rt, rs, 32 - (pos + size));
+ srl(rt, rt, 32 - size);
}
+}
- switch (cond) {
- case cc_always:
- b(offset);
- break;
- case eq:
- beq(rs, r2, offset);
- break;
- case ne:
- bne(rs, r2, offset);
- break;
- // Signed comparison
- case greater:
- slt(scratch, r2, rs);
- bne(scratch, zero_reg, offset);
- break;
- case greater_equal:
- slt(scratch, rs, r2);
- beq(scratch, zero_reg, offset);
- break;
- case less:
- slt(scratch, rs, r2);
- bne(scratch, zero_reg, offset);
- break;
- case less_equal:
- slt(scratch, r2, rs);
- beq(scratch, zero_reg, offset);
- break;
+void MacroAssembler::Ins(Register rt,
+ Register rs,
+ uint16_t pos,
+ uint16_t size) {
+ ASSERT(pos < 32);
+ ASSERT(pos + size < 32);
- // Unsigned comparison.
- case Ugreater:
- sltu(scratch, r2, rs);
- bne(scratch, zero_reg, offset);
- break;
- case Ugreater_equal:
- sltu(scratch, rs, r2);
- beq(scratch, zero_reg, offset);
- break;
- case Uless:
- sltu(scratch, rs, r2);
- bne(scratch, zero_reg, offset);
- break;
- case Uless_equal:
- sltu(scratch, r2, rs);
- beq(scratch, zero_reg, offset);
- break;
+ if (mips32r2) {
+ ins_(rt, rs, pos, size);
+ } else {
+ ASSERT(!rt.is(t8) && !rs.is(t8));
+
+ srl(t8, rt, pos + size);
+ // The left chunk from rt that needs to
+ // be saved is on the right side of t8.
+ sll(at, t8, pos + size);
+ // The 'at' register now contains the left chunk on
+ // the left (proper position) and zeroes.
+ sll(t8, rt, 32 - pos);
+ // t8 now contains the right chunk on the left and zeroes.
+ srl(t8, t8, 32 - pos);
+ // t8 now contains the right chunk on
+ // the right (proper position) and zeroes.
+ or_(rt, at, t8);
+ // rt now contains the left and right chunks from the original rt
+ // in their proper position and zeroes in the middle.
+ sll(t8, rs, 32 - size);
+ // t8 now contains the chunk from rs on the left and zeroes.
+ srl(t8, t8, 32 - size - pos);
+ // t8 now contains the original chunk from rs in
+ // the middle (proper position).
+ or_(rt, rt, t8);
+ // rt now contains the result of the ins instruction in R2 mode.
+ }
+}
- default:
- UNREACHABLE();
+
+void MacroAssembler::Cvt_d_uw(FPURegister fd, FPURegister fs) {
+ // Move the data from fs to t4.
+ mfc1(t4, fs);
+ return Cvt_d_uw(fd, t4);
+}
+
+
+void MacroAssembler::Cvt_d_uw(FPURegister fd, Register rs) {
+ // Convert rs to a FP value in fd (and fd + 1).
+ // We do this by converting rs minus the MSB to avoid sign conversion,
+ // then adding 2^31-1 and 1 to the result.
+
+ ASSERT(!fd.is(f20));
+ ASSERT(!rs.is(t9));
+ ASSERT(!rs.is(t8));
+
+ // Save rs's MSB to t8
+ And(t8, rs, 0x80000000);
+ // Remove rs's MSB.
+ And(t9, rs, 0x7FFFFFFF);
+ // Move t9 to fd
+ mtc1(t9, fd);
+
+ // Convert fd to a real FP value.
+ cvt_d_w(fd, fd);
+
+ Label conversion_done;
+
+ // If rs's MSB was 0, it's done.
+ // Otherwise we need to add that to the FP register.
+ Branch(&conversion_done, eq, t8, Operand(zero_reg));
+
+ // First load 2^31 - 1 into f20.
+ Or(t9, zero_reg, 0x7FFFFFFF);
+ mtc1(t9, f20);
+
+ // Convert it to FP and add it to fd.
+ cvt_d_w(f20, f20);
+ add_d(fd, fd, f20);
+ // Now add 1.
+ Or(t9, zero_reg, 1);
+ mtc1(t9, f20);
+
+ cvt_d_w(f20, f20);
+ add_d(fd, fd, f20);
+ bind(&conversion_done);
+}
+
+
+void MacroAssembler::Trunc_uw_d(FPURegister fd, FPURegister fs) {
+ Trunc_uw_d(fs, t4);
+ mtc1(t4, fd);
+}
+
+
+void MacroAssembler::Trunc_uw_d(FPURegister fd, Register rs) {
+ ASSERT(!fd.is(f22));
+ ASSERT(!rs.is(t6));
+
+ // Load 2^31 into f22.
+ Or(t6, zero_reg, 0x80000000);
+ Cvt_d_uw(f22, t6);
+
+ // Test if f22 > fd.
+ c(OLT, D, fd, f22);
+
+ Label simple_convert;
+ // If fd < 2^31 we can convert it normally.
+ bc1t(&simple_convert);
+
+ // First we subtract 2^31 from fd, then trunc it to rs
+ // and add 2^31 to rs.
+
+ sub_d(f22, fd, f22);
+ trunc_w_d(f22, f22);
+ mfc1(rs, f22);
+ or_(rs, rs, t6);
+
+ Label done;
+ Branch(&done);
+ // Simple conversion.
+ bind(&simple_convert);
+ trunc_w_d(f22, fd);
+ mfc1(rs, f22);
+
+ bind(&done);
+}
+
+
+// Tries to get a signed int32 out of a double precision floating point heap
+// number. Rounds towards 0. Branch to 'not_int32' if the double is out of the
+// 32bits signed integer range.
+// This method implementation differs from the ARM version for performance
+// reasons.
+void MacroAssembler::ConvertToInt32(Register source,
+ Register dest,
+ Register scratch,
+ Register scratch2,
+ FPURegister double_scratch,
+ Label *not_int32) {
+ Label right_exponent, done;
+ // Get exponent word (ENDIAN issues).
+ lw(scratch, FieldMemOperand(source, HeapNumber::kExponentOffset));
+ // Get exponent alone in scratch2.
+ And(scratch2, scratch, Operand(HeapNumber::kExponentMask));
+ // Load dest with zero. We use this either for the final shift or
+ // for the answer.
+ mov(dest, zero_reg);
+ // Check whether the exponent matches a 32 bit signed int that is not a Smi.
+ // A non-Smi integer is 1.xxx * 2^30 so the exponent is 30 (biased). This is
+ // the exponent that we are fastest at and also the highest exponent we can
+ // handle here.
+ const uint32_t non_smi_exponent =
+ (HeapNumber::kExponentBias + 30) << HeapNumber::kExponentShift;
+ // If we have a match of the int32-but-not-Smi exponent then skip some logic.
+ Branch(&right_exponent, eq, scratch2, Operand(non_smi_exponent));
+ // If the exponent is higher than that then go to not_int32 case. This
+ // catches numbers that don't fit in a signed int32, infinities and NaNs.
+ Branch(not_int32, gt, scratch2, Operand(non_smi_exponent));
+
+ // We know the exponent is smaller than 30 (biased). If it is less than
+ // 0 (biased) then the number is smaller in magnitude than 1.0 * 2^0, ie
+ // it rounds to zero.
+ const uint32_t zero_exponent =
+ (HeapNumber::kExponentBias + 0) << HeapNumber::kExponentShift;
+ Subu(scratch2, scratch2, Operand(zero_exponent));
+ // Dest already has a Smi zero.
+ Branch(&done, lt, scratch2, Operand(zero_reg));
+ if (!Isolate::Current()->cpu_features()->IsSupported(FPU)) {
+ // We have a shifted exponent between 0 and 30 in scratch2.
+ srl(dest, scratch2, HeapNumber::kExponentShift);
+ // We now have the exponent in dest. Subtract from 30 to get
+ // how much to shift down.
+ li(at, Operand(30));
+ subu(dest, at, dest);
}
- // Emit a nop in the branch delay slot.
- nop();
+ bind(&right_exponent);
+ if (Isolate::Current()->cpu_features()->IsSupported(FPU)) {
+ CpuFeatures::Scope scope(FPU);
+ // MIPS FPU instructions implementing double precision to integer
+ // conversion using round to zero. Since the FP value was qualified
+ // above, the resulting integer should be a legal int32.
+ // The original 'Exponent' word is still in scratch.
+ lwc1(double_scratch, FieldMemOperand(source, HeapNumber::kMantissaOffset));
+ mtc1(scratch, FPURegister::from_code(double_scratch.code() + 1));
+ trunc_w_d(double_scratch, double_scratch);
+ mfc1(dest, double_scratch);
+ } else {
+ // On entry, dest has final downshift, scratch has original sign/exp/mant.
+ // Save sign bit in top bit of dest.
+ And(scratch2, scratch, Operand(0x80000000));
+ Or(dest, dest, Operand(scratch2));
+ // Put back the implicit 1, just above mantissa field.
+ Or(scratch, scratch, Operand(1 << HeapNumber::kExponentShift));
+
+ // Shift up the mantissa bits to take up the space the exponent used to
+ // take. We just orred in the implicit bit so that took care of one and
+ // we want to leave the sign bit 0 so we subtract 2 bits from the shift
+ // distance. But we want to clear the sign-bit so shift one more bit
+ // left, then shift right one bit.
+ const int shift_distance = HeapNumber::kNonMantissaBitsInTopWord - 2;
+ sll(scratch, scratch, shift_distance + 1);
+ srl(scratch, scratch, 1);
+
+ // Get the second half of the double. For some exponents we don't
+ // actually need this because the bits get shifted out again, but
+ // it's probably slower to test than just to do it.
+ lw(scratch2, FieldMemOperand(source, HeapNumber::kMantissaOffset));
+ // Extract the top 10 bits, and insert those bottom 10 bits of scratch.
+ // The width of the field here is the same as the shift amount above.
+ const int field_width = shift_distance;
+ Ext(scratch2, scratch2, 32-shift_distance, field_width);
+ Ins(scratch, scratch2, 0, field_width);
+ // Move down according to the exponent.
+ srlv(scratch, scratch, dest);
+ // Prepare the negative version of our integer.
+ subu(scratch2, zero_reg, scratch);
+ // Trick to check sign bit (msb) held in dest, count leading zero.
+ // 0 indicates negative, save negative version with conditional move.
+ clz(dest, dest);
+ movz(scratch, scratch2, dest);
+ mov(dest, scratch);
+ }
+ bind(&done);
+}
+
+
+// Emulated condtional branches do not emit a nop in the branch delay slot.
+//
+// BRANCH_ARGS_CHECK checks that conditional jump arguments are correct.
+#define BRANCH_ARGS_CHECK(cond, rs, rt) ASSERT( \
+ (cond == cc_always && rs.is(zero_reg) && rt.rm().is(zero_reg)) || \
+ (cond != cc_always && (!rs.is(zero_reg) || !rt.rm().is(zero_reg))))
+
+
+void MacroAssembler::Branch(int16_t offset,
+ bool ProtectBranchDelaySlot) {
+ b(offset);
+
+ // Emit a nop in the branch delay slot if required.
+ if (ProtectBranchDelaySlot)
+ nop();
}
-void MacroAssembler::Branch(Condition cond, Label* L, Register rs,
- const Operand& rt, Register scratch) {
+void MacroAssembler::Branch(int16_t offset, Condition cond, Register rs,
+ const Operand& rt,
+ bool ProtectBranchDelaySlot) {
+ BRANCH_ARGS_CHECK(cond, rs, rt);
+ ASSERT(!rs.is(zero_reg));
Register r2 = no_reg;
+ Register scratch = at;
+
if (rt.is_reg()) {
+ // We don't want any other register but scratch clobbered.
+ ASSERT(!scratch.is(rs) && !scratch.is(rt.rm_));
r2 = rt.rm_;
- } else if (cond != cc_always) {
- r2 = scratch;
- li(r2, rt);
+ switch (cond) {
+ case cc_always:
+ b(offset);
+ break;
+ case eq:
+ beq(rs, r2, offset);
+ break;
+ case ne:
+ bne(rs, r2, offset);
+ break;
+ // Signed comparison
+ case greater:
+ if (r2.is(zero_reg)) {
+ bgtz(rs, offset);
+ } else {
+ slt(scratch, r2, rs);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case greater_equal:
+ if (r2.is(zero_reg)) {
+ bgez(rs, offset);
+ } else {
+ slt(scratch, rs, r2);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ case less:
+ if (r2.is(zero_reg)) {
+ bltz(rs, offset);
+ } else {
+ slt(scratch, rs, r2);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case less_equal:
+ if (r2.is(zero_reg)) {
+ blez(rs, offset);
+ } else {
+ slt(scratch, r2, rs);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ // Unsigned comparison.
+ case Ugreater:
+ if (r2.is(zero_reg)) {
+ bgtz(rs, offset);
+ } else {
+ sltu(scratch, r2, rs);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case Ugreater_equal:
+ if (r2.is(zero_reg)) {
+ bgez(rs, offset);
+ } else {
+ sltu(scratch, rs, r2);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ case Uless:
+ if (r2.is(zero_reg)) {
+ b(offset);
+ } else {
+ sltu(scratch, rs, r2);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case Uless_equal:
+ if (r2.is(zero_reg)) {
+ b(offset);
+ } else {
+ sltu(scratch, r2, rs);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ default:
+ UNREACHABLE();
+ }
+ } else {
+ // Be careful to always use shifted_branch_offset only just before the
+ // branch instruction, as the location will be remember for patching the
+ // target.
+ switch (cond) {
+ case cc_always:
+ b(offset);
+ break;
+ case eq:
+ // We don't want any other register but scratch clobbered.
+ ASSERT(!scratch.is(rs));
+ r2 = scratch;
+ li(r2, rt);
+ beq(rs, r2, offset);
+ break;
+ case ne:
+ // We don't want any other register but scratch clobbered.
+ ASSERT(!scratch.is(rs));
+ r2 = scratch;
+ li(r2, rt);
+ bne(rs, r2, offset);
+ break;
+ // Signed comparison
+ case greater:
+ if (rt.imm32_ == 0) {
+ bgtz(rs, offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ slt(scratch, r2, rs);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case greater_equal:
+ if (rt.imm32_ == 0) {
+ bgez(rs, offset);
+ } else if (is_int16(rt.imm32_)) {
+ slti(scratch, rs, rt.imm32_);
+ beq(scratch, zero_reg, offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ sltu(scratch, rs, r2);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ case less:
+ if (rt.imm32_ == 0) {
+ bltz(rs, offset);
+ } else if (is_int16(rt.imm32_)) {
+ slti(scratch, rs, rt.imm32_);
+ bne(scratch, zero_reg, offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ slt(scratch, rs, r2);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case less_equal:
+ if (rt.imm32_ == 0) {
+ blez(rs, offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ slt(scratch, r2, rs);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ // Unsigned comparison.
+ case Ugreater:
+ if (rt.imm32_ == 0) {
+ bgtz(rs, offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ sltu(scratch, r2, rs);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case Ugreater_equal:
+ if (rt.imm32_ == 0) {
+ bgez(rs, offset);
+ } else if (is_int16(rt.imm32_)) {
+ sltiu(scratch, rs, rt.imm32_);
+ beq(scratch, zero_reg, offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ sltu(scratch, rs, r2);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ case Uless:
+ if (rt.imm32_ == 0) {
+ b(offset);
+ } else if (is_int16(rt.imm32_)) {
+ sltiu(scratch, rs, rt.imm32_);
+ bne(scratch, zero_reg, offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ sltu(scratch, rs, r2);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case Uless_equal:
+ if (rt.imm32_ == 0) {
+ b(offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ sltu(scratch, r2, rs);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ default:
+ UNREACHABLE();
+ }
}
+ // Emit a nop in the branch delay slot if required.
+ if (ProtectBranchDelaySlot)
+ nop();
+}
+
+void MacroAssembler::Branch(Label* L,
+ bool ProtectBranchDelaySlot) {
// We use branch_offset as an argument for the branch instructions to be sure
// it is called just before generating the branch instruction, as needed.
- switch (cond) {
- case cc_always:
- b(shifted_branch_offset(L, false));
- break;
- case eq:
- beq(rs, r2, shifted_branch_offset(L, false));
- break;
- case ne:
- bne(rs, r2, shifted_branch_offset(L, false));
- break;
+ b(shifted_branch_offset(L, false));
- // Signed comparison
- case greater:
- slt(scratch, r2, rs);
- bne(scratch, zero_reg, shifted_branch_offset(L, false));
- break;
- case greater_equal:
- slt(scratch, rs, r2);
- beq(scratch, zero_reg, shifted_branch_offset(L, false));
- break;
- case less:
- slt(scratch, rs, r2);
- bne(scratch, zero_reg, shifted_branch_offset(L, false));
- break;
- case less_equal:
- slt(scratch, r2, rs);
- beq(scratch, zero_reg, shifted_branch_offset(L, false));
- break;
+ // Emit a nop in the branch delay slot if required.
+ if (ProtectBranchDelaySlot)
+ nop();
+}
- // Unsigned comparison.
- case Ugreater:
- sltu(scratch, r2, rs);
- bne(scratch, zero_reg, shifted_branch_offset(L, false));
- break;
- case Ugreater_equal:
- sltu(scratch, rs, r2);
- beq(scratch, zero_reg, shifted_branch_offset(L, false));
- break;
- case Uless:
- sltu(scratch, rs, r2);
- bne(scratch, zero_reg, shifted_branch_offset(L, false));
- break;
- case Uless_equal:
- sltu(scratch, r2, rs);
- beq(scratch, zero_reg, shifted_branch_offset(L, false));
- break;
- default:
- UNREACHABLE();
+void MacroAssembler::Branch(Label* L, Condition cond, Register rs,
+ const Operand& rt,
+ bool ProtectBranchDelaySlot) {
+ BRANCH_ARGS_CHECK(cond, rs, rt);
+
+ int32_t offset;
+ Register r2 = no_reg;
+ Register scratch = at;
+ if (rt.is_reg()) {
+ r2 = rt.rm_;
+ // Be careful to always use shifted_branch_offset only just before the
+ // branch instruction, as the location will be remember for patching the
+ // target.
+ switch (cond) {
+ case cc_always:
+ offset = shifted_branch_offset(L, false);
+ b(offset);
+ break;
+ case eq:
+ offset = shifted_branch_offset(L, false);
+ beq(rs, r2, offset);
+ break;
+ case ne:
+ offset = shifted_branch_offset(L, false);
+ bne(rs, r2, offset);
+ break;
+ // Signed comparison
+ case greater:
+ if (r2.is(zero_reg)) {
+ offset = shifted_branch_offset(L, false);
+ bgtz(rs, offset);
+ } else {
+ slt(scratch, r2, rs);
+ offset = shifted_branch_offset(L, false);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case greater_equal:
+ if (r2.is(zero_reg)) {
+ offset = shifted_branch_offset(L, false);
+ bgez(rs, offset);
+ } else {
+ slt(scratch, rs, r2);
+ offset = shifted_branch_offset(L, false);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ case less:
+ if (r2.is(zero_reg)) {
+ offset = shifted_branch_offset(L, false);
+ bltz(rs, offset);
+ } else {
+ slt(scratch, rs, r2);
+ offset = shifted_branch_offset(L, false);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case less_equal:
+ if (r2.is(zero_reg)) {
+ offset = shifted_branch_offset(L, false);
+ blez(rs, offset);
+ } else {
+ slt(scratch, r2, rs);
+ offset = shifted_branch_offset(L, false);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ // Unsigned comparison.
+ case Ugreater:
+ if (r2.is(zero_reg)) {
+ offset = shifted_branch_offset(L, false);
+ bgtz(rs, offset);
+ } else {
+ sltu(scratch, r2, rs);
+ offset = shifted_branch_offset(L, false);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case Ugreater_equal:
+ if (r2.is(zero_reg)) {
+ offset = shifted_branch_offset(L, false);
+ bgez(rs, offset);
+ } else {
+ sltu(scratch, rs, r2);
+ offset = shifted_branch_offset(L, false);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ case Uless:
+ if (r2.is(zero_reg)) {
+ offset = shifted_branch_offset(L, false);
+ b(offset);
+ } else {
+ sltu(scratch, rs, r2);
+ offset = shifted_branch_offset(L, false);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case Uless_equal:
+ if (r2.is(zero_reg)) {
+ offset = shifted_branch_offset(L, false);
+ b(offset);
+ } else {
+ sltu(scratch, r2, rs);
+ offset = shifted_branch_offset(L, false);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ default:
+ UNREACHABLE();
+ }
+ } else {
+ // Be careful to always use shifted_branch_offset only just before the
+ // branch instruction, as the location will be remember for patching the
+ // target.
+ switch (cond) {
+ case cc_always:
+ offset = shifted_branch_offset(L, false);
+ b(offset);
+ break;
+ case eq:
+ r2 = scratch;
+ li(r2, rt);
+ offset = shifted_branch_offset(L, false);
+ beq(rs, r2, offset);
+ break;
+ case ne:
+ r2 = scratch;
+ li(r2, rt);
+ offset = shifted_branch_offset(L, false);
+ bne(rs, r2, offset);
+ break;
+ // Signed comparison
+ case greater:
+ if (rt.imm32_ == 0) {
+ offset = shifted_branch_offset(L, false);
+ bgtz(rs, offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ slt(scratch, r2, rs);
+ offset = shifted_branch_offset(L, false);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case greater_equal:
+ if (rt.imm32_ == 0) {
+ offset = shifted_branch_offset(L, false);
+ bgez(rs, offset);
+ } else if (is_int16(rt.imm32_)) {
+ slti(scratch, rs, rt.imm32_);
+ offset = shifted_branch_offset(L, false);
+ beq(scratch, zero_reg, offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ sltu(scratch, rs, r2);
+ offset = shifted_branch_offset(L, false);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ case less:
+ if (rt.imm32_ == 0) {
+ offset = shifted_branch_offset(L, false);
+ bltz(rs, offset);
+ } else if (is_int16(rt.imm32_)) {
+ slti(scratch, rs, rt.imm32_);
+ offset = shifted_branch_offset(L, false);
+ bne(scratch, zero_reg, offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ slt(scratch, rs, r2);
+ offset = shifted_branch_offset(L, false);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case less_equal:
+ if (rt.imm32_ == 0) {
+ offset = shifted_branch_offset(L, false);
+ blez(rs, offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ slt(scratch, r2, rs);
+ offset = shifted_branch_offset(L, false);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ // Unsigned comparison.
+ case Ugreater:
+ if (rt.imm32_ == 0) {
+ offset = shifted_branch_offset(L, false);
+ bgtz(rs, offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ sltu(scratch, r2, rs);
+ offset = shifted_branch_offset(L, false);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case Ugreater_equal:
+ if (rt.imm32_ == 0) {
+ offset = shifted_branch_offset(L, false);
+ bgez(rs, offset);
+ } else if (is_int16(rt.imm32_)) {
+ sltiu(scratch, rs, rt.imm32_);
+ offset = shifted_branch_offset(L, false);
+ beq(scratch, zero_reg, offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ sltu(scratch, rs, r2);
+ offset = shifted_branch_offset(L, false);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ case Uless:
+ if (rt.imm32_ == 0) {
+ offset = shifted_branch_offset(L, false);
+ b(offset);
+ } else if (is_int16(rt.imm32_)) {
+ sltiu(scratch, rs, rt.imm32_);
+ offset = shifted_branch_offset(L, false);
+ bne(scratch, zero_reg, offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ sltu(scratch, rs, r2);
+ offset = shifted_branch_offset(L, false);
+ bne(scratch, zero_reg, offset);
+ }
+ break;
+ case Uless_equal:
+ if (rt.imm32_ == 0) {
+ offset = shifted_branch_offset(L, false);
+ b(offset);
+ } else {
+ r2 = scratch;
+ li(r2, rt);
+ sltu(scratch, r2, rs);
+ offset = shifted_branch_offset(L, false);
+ beq(scratch, zero_reg, offset);
+ }
+ break;
+ default:
+ UNREACHABLE();
+ }
}
- // Emit a nop in the branch delay slot.
- nop();
+ // Check that offset could actually hold on an int16_t.
+ ASSERT(is_int16(offset));
+ // Emit a nop in the branch delay slot if required.
+ if (ProtectBranchDelaySlot)
+ nop();
}
-// Trashes the at register if no scratch register is provided.
// We need to use a bgezal or bltzal, but they can't be used directly with the
// slt instructions. We could use sub or add instead but we would miss overflow
// cases, so we keep slt and add an intermediate third instruction.
-void MacroAssembler::BranchAndLink(Condition cond, int16_t offset, Register rs,
- const Operand& rt, Register scratch) {
+void MacroAssembler::BranchAndLink(int16_t offset,
+ bool ProtectBranchDelaySlot) {
+ bal(offset);
+
+ // Emit a nop in the branch delay slot if required.
+ if (ProtectBranchDelaySlot)
+ nop();
+}
+
+
+void MacroAssembler::BranchAndLink(int16_t offset, Condition cond, Register rs,
+ const Operand& rt,
+ bool ProtectBranchDelaySlot) {
+ BRANCH_ARGS_CHECK(cond, rs, rt);
Register r2 = no_reg;
+ Register scratch = at;
+
if (rt.is_reg()) {
r2 = rt.rm_;
} else if (cond != cc_always) {
@@ -633,14 +1500,30 @@ void MacroAssembler::BranchAndLink(Condition cond, int16_t offset, Register rs,
default:
UNREACHABLE();
}
- // Emit a nop in the branch delay slot.
- nop();
+ // Emit a nop in the branch delay slot if required.
+ if (ProtectBranchDelaySlot)
+ nop();
+}
+
+
+void MacroAssembler::BranchAndLink(Label* L,
+ bool ProtectBranchDelaySlot) {
+ bal(shifted_branch_offset(L, false));
+
+ // Emit a nop in the branch delay slot if required.
+ if (ProtectBranchDelaySlot)
+ nop();
}
-void MacroAssembler::BranchAndLink(Condition cond, Label* L, Register rs,
- const Operand& rt, Register scratch) {
+void MacroAssembler::BranchAndLink(Label* L, Condition cond, Register rs,
+ const Operand& rt,
+ bool ProtectBranchDelaySlot) {
+ BRANCH_ARGS_CHECK(cond, rs, rt);
+
+ int32_t offset;
Register r2 = no_reg;
+ Register scratch = at;
if (rt.is_reg()) {
r2 = rt.rm_;
} else if (cond != cc_always) {
@@ -650,157 +1533,280 @@ void MacroAssembler::BranchAndLink(Condition cond, Label* L, Register rs,
switch (cond) {
case cc_always:
- bal(shifted_branch_offset(L, false));
+ offset = shifted_branch_offset(L, false);
+ bal(offset);
break;
case eq:
bne(rs, r2, 2);
nop();
- bal(shifted_branch_offset(L, false));
+ offset = shifted_branch_offset(L, false);
+ bal(offset);
break;
case ne:
beq(rs, r2, 2);
nop();
- bal(shifted_branch_offset(L, false));
+ offset = shifted_branch_offset(L, false);
+ bal(offset);
break;
// Signed comparison
case greater:
slt(scratch, r2, rs);
addiu(scratch, scratch, -1);
- bgezal(scratch, shifted_branch_offset(L, false));
+ offset = shifted_branch_offset(L, false);
+ bgezal(scratch, offset);
break;
case greater_equal:
slt(scratch, rs, r2);
addiu(scratch, scratch, -1);
- bltzal(scratch, shifted_branch_offset(L, false));
+ offset = shifted_branch_offset(L, false);
+ bltzal(scratch, offset);
break;
case less:
slt(scratch, rs, r2);
addiu(scratch, scratch, -1);
- bgezal(scratch, shifted_branch_offset(L, false));
+ offset = shifted_branch_offset(L, false);
+ bgezal(scratch, offset);
break;
case less_equal:
slt(scratch, r2, rs);
addiu(scratch, scratch, -1);
- bltzal(scratch, shifted_branch_offset(L, false));
+ offset = shifted_branch_offset(L, false);
+ bltzal(scratch, offset);
break;
// Unsigned comparison.
case Ugreater:
sltu(scratch, r2, rs);
addiu(scratch, scratch, -1);
- bgezal(scratch, shifted_branch_offset(L, false));
+ offset = shifted_branch_offset(L, false);
+ bgezal(scratch, offset);
break;
case Ugreater_equal:
sltu(scratch, rs, r2);
addiu(scratch, scratch, -1);
- bltzal(scratch, shifted_branch_offset(L, false));
+ offset = shifted_branch_offset(L, false);
+ bltzal(scratch, offset);
break;
case Uless:
sltu(scratch, rs, r2);
addiu(scratch, scratch, -1);
- bgezal(scratch, shifted_branch_offset(L, false));
+ offset = shifted_branch_offset(L, false);
+ bgezal(scratch, offset);
break;
case Uless_equal:
sltu(scratch, r2, rs);
addiu(scratch, scratch, -1);
- bltzal(scratch, shifted_branch_offset(L, false));
+ offset = shifted_branch_offset(L, false);
+ bltzal(scratch, offset);
break;
default:
UNREACHABLE();
}
- // Emit a nop in the branch delay slot.
- nop();
+
+ // Check that offset could actually hold on an int16_t.
+ ASSERT(is_int16(offset));
+
+ // Emit a nop in the branch delay slot if required.
+ if (ProtectBranchDelaySlot)
+ nop();
}
void MacroAssembler::Jump(const Operand& target,
- Condition cond, Register rs, const Operand& rt) {
+ bool ProtectBranchDelaySlot) {
+ if (target.is_reg()) {
+ jr(target.rm());
+ } else { // !target.is_reg()
+ if (!MustUseReg(target.rmode_)) {
+ j(target.imm32_);
+ } else { // MustUseReg(target)
+ li(t9, target);
+ jr(t9);
+ }
+ }
+ // Emit a nop in the branch delay slot if required.
+ if (ProtectBranchDelaySlot)
+ nop();
+}
+
+
+void MacroAssembler::Jump(const Operand& target,
+ Condition cond, Register rs, const Operand& rt,
+ bool ProtectBranchDelaySlot) {
+ BRANCH_ARGS_CHECK(cond, rs, rt);
if (target.is_reg()) {
if (cond == cc_always) {
jr(target.rm());
} else {
- Branch(NegateCondition(cond), 2, rs, rt);
+ Branch(2, NegateCondition(cond), rs, rt);
jr(target.rm());
}
} else { // !target.is_reg()
- if (!MustUseAt(target.rmode_)) {
+ if (!MustUseReg(target.rmode_)) {
if (cond == cc_always) {
j(target.imm32_);
} else {
- Branch(NegateCondition(cond), 2, rs, rt);
+ Branch(2, NegateCondition(cond), rs, rt);
j(target.imm32_); // Will generate only one instruction.
}
- } else { // MustUseAt(target)
- li(at, target);
+ } else { // MustUseReg(target)
+ li(t9, target);
if (cond == cc_always) {
- jr(at);
+ jr(t9);
} else {
- Branch(NegateCondition(cond), 2, rs, rt);
- jr(at); // Will generate only one instruction.
+ Branch(2, NegateCondition(cond), rs, rt);
+ jr(t9); // Will generate only one instruction.
}
}
}
- // Emit a nop in the branch delay slot.
- nop();
+ // Emit a nop in the branch delay slot if required.
+ if (ProtectBranchDelaySlot)
+ nop();
}
+// Note: To call gcc-compiled C code on mips, you must call thru t9.
void MacroAssembler::Call(const Operand& target,
- Condition cond, Register rs, const Operand& rt) {
+ bool ProtectBranchDelaySlot) {
+ BlockTrampolinePoolScope block_trampoline_pool(this);
+ if (target.is_reg()) {
+ jalr(target.rm());
+ } else { // !target.is_reg()
+ if (!MustUseReg(target.rmode_)) {
+ jal(target.imm32_);
+ } else { // MustUseReg(target)
+ li(t9, target);
+ jalr(t9);
+ }
+ }
+ // Emit a nop in the branch delay slot if required.
+ if (ProtectBranchDelaySlot)
+ nop();
+}
+
+
+// Note: To call gcc-compiled C code on mips, you must call thru t9.
+void MacroAssembler::Call(const Operand& target,
+ Condition cond, Register rs, const Operand& rt,
+ bool ProtectBranchDelaySlot) {
+ BRANCH_ARGS_CHECK(cond, rs, rt);
+ BlockTrampolinePoolScope block_trampoline_pool(this);
if (target.is_reg()) {
if (cond == cc_always) {
jalr(target.rm());
} else {
- Branch(NegateCondition(cond), 2, rs, rt);
+ Branch(2, NegateCondition(cond), rs, rt);
jalr(target.rm());
}
} else { // !target.is_reg()
- if (!MustUseAt(target.rmode_)) {
+ if (!MustUseReg(target.rmode_)) {
if (cond == cc_always) {
jal(target.imm32_);
} else {
- Branch(NegateCondition(cond), 2, rs, rt);
+ Branch(2, NegateCondition(cond), rs, rt);
jal(target.imm32_); // Will generate only one instruction.
}
- } else { // MustUseAt(target)
- li(at, target);
+ } else { // MustUseReg(target)
+ li(t9, target);
if (cond == cc_always) {
- jalr(at);
+ jalr(t9);
} else {
- Branch(NegateCondition(cond), 2, rs, rt);
- jalr(at); // Will generate only one instruction.
+ Branch(2, NegateCondition(cond), rs, rt);
+ jalr(t9); // Will generate only one instruction.
}
}
}
- // Emit a nop in the branch delay slot.
- nop();
+ // Emit a nop in the branch delay slot if required.
+ if (ProtectBranchDelaySlot)
+ nop();
+}
+
+
+void MacroAssembler::Drop(int count,
+ Condition cond,
+ Register reg,
+ const Operand& op) {
+ if (count <= 0) {
+ return;
+ }
+
+ Label skip;
+
+ if (cond != al) {
+ Branch(&skip, NegateCondition(cond), reg, op);
+ }
+
+ if (count > 0) {
+ addiu(sp, sp, count * kPointerSize);
+ }
+
+ if (cond != al) {
+ bind(&skip);
+ }
}
-void MacroAssembler::StackLimitCheck(Label* on_stack_overflow) {
- UNIMPLEMENTED_MIPS();
+
+void MacroAssembler::DropAndRet(int drop,
+ Condition cond,
+ Register r1,
+ const Operand& r2) {
+ // This is a workaround to make sure only one branch instruction is
+ // generated. It relies on Drop and Ret not creating branches if
+ // cond == cc_always.
+ Label skip;
+ if (cond != cc_always) {
+ Branch(&skip, NegateCondition(cond), r1, r2);
+ }
+
+ Drop(drop);
+ Ret();
+
+ if (cond != cc_always) {
+ bind(&skip);
+ }
}
-void MacroAssembler::Drop(int count, Condition cond) {
- UNIMPLEMENTED_MIPS();
+void MacroAssembler::Swap(Register reg1,
+ Register reg2,
+ Register scratch) {
+ if (scratch.is(no_reg)) {
+ Xor(reg1, reg1, Operand(reg2));
+ Xor(reg2, reg2, Operand(reg1));
+ Xor(reg1, reg1, Operand(reg2));
+ } else {
+ mov(scratch, reg1);
+ mov(reg1, reg2);
+ mov(reg2, scratch);
+ }
}
void MacroAssembler::Call(Label* target) {
- UNIMPLEMENTED_MIPS();
+ BranchAndLink(cc_always, target);
+}
+
+
+void MacroAssembler::Move(Register dst, Register src) {
+ if (!dst.is(src)) {
+ mov(dst, src);
+ }
}
#ifdef ENABLE_DEBUGGER_SUPPORT
- // ---------------------------------------------------------------------------
- // Debugger Support
- void MacroAssembler::DebugBreak() {
- UNIMPLEMENTED_MIPS();
- }
-#endif
+void MacroAssembler::DebugBreak() {
+ ASSERT(allow_stub_calls());
+ mov(a0, zero_reg);
+ li(a1, Operand(ExternalReference(Runtime::kDebugBreak, isolate())));
+ CEntryStub ces(1);
+ Call(ces.GetCode(), RelocInfo::DEBUG_BREAK);
+}
+
+#endif // ENABLE_DEBUGGER_SUPPORT
// ---------------------------------------------------------------------------
@@ -822,7 +1828,7 @@ void MacroAssembler::PushTryHandler(CodeLocation try_location,
&& StackHandlerConstants::kPCOffset == 3 * kPointerSize
&& StackHandlerConstants::kNextOffset == 0 * kPointerSize);
// Save the current handler as the next handler.
- LoadExternalReference(t2, ExternalReference(Isolate::k_handler_address));
+ li(t2, Operand(ExternalReference(Isolate::k_handler_address, isolate())));
lw(t1, MemOperand(t2));
addiu(sp, sp, -StackHandlerConstants::kSize);
@@ -848,7 +1854,7 @@ void MacroAssembler::PushTryHandler(CodeLocation try_location,
li(t0, Operand(StackHandler::ENTRY));
// Save the current handler as the next handler.
- LoadExternalReference(t2, ExternalReference(Isolate::k_handler_address));
+ li(t2, Operand(ExternalReference(Isolate::k_handler_address, isolate())));
lw(t1, MemOperand(t2));
addiu(sp, sp, -StackHandlerConstants::kSize);
@@ -864,45 +1870,394 @@ void MacroAssembler::PushTryHandler(CodeLocation try_location,
void MacroAssembler::PopTryHandler() {
- UNIMPLEMENTED_MIPS();
+ ASSERT_EQ(0, StackHandlerConstants::kNextOffset);
+ pop(a1);
+ Addu(sp, sp, Operand(StackHandlerConstants::kSize - kPointerSize));
+ li(at, Operand(ExternalReference(Isolate::k_handler_address, isolate())));
+ sw(a1, MemOperand(at));
+}
+
+
+void MacroAssembler::AllocateInNewSpace(int object_size,
+ Register result,
+ Register scratch1,
+ Register scratch2,
+ Label* gc_required,
+ AllocationFlags flags) {
+ if (!FLAG_inline_new) {
+ if (FLAG_debug_code) {
+ // Trash the registers to simulate an allocation failure.
+ li(result, 0x7091);
+ li(scratch1, 0x7191);
+ li(scratch2, 0x7291);
+ }
+ jmp(gc_required);
+ return;
+ }
+
+ ASSERT(!result.is(scratch1));
+ ASSERT(!result.is(scratch2));
+ ASSERT(!scratch1.is(scratch2));
+ ASSERT(!scratch1.is(t9));
+ ASSERT(!scratch2.is(t9));
+ ASSERT(!result.is(t9));
+
+ // Make object size into bytes.
+ if ((flags & SIZE_IN_WORDS) != 0) {
+ object_size *= kPointerSize;
+ }
+ ASSERT_EQ(0, object_size & kObjectAlignmentMask);
+
+ // Check relative positions of allocation top and limit addresses.
+ // ARM adds additional checks to make sure the ldm instruction can be
+ // used. On MIPS we don't have ldm so we don't need additional checks either.
+ ExternalReference new_space_allocation_top =
+ ExternalReference::new_space_allocation_top_address(isolate());
+ ExternalReference new_space_allocation_limit =
+ ExternalReference::new_space_allocation_limit_address(isolate());
+ intptr_t top =
+ reinterpret_cast<intptr_t>(new_space_allocation_top.address());
+ intptr_t limit =
+ reinterpret_cast<intptr_t>(new_space_allocation_limit.address());
+ ASSERT((limit - top) == kPointerSize);
+
+ // Set up allocation top address and object size registers.
+ Register topaddr = scratch1;
+ Register obj_size_reg = scratch2;
+ li(topaddr, Operand(new_space_allocation_top));
+ li(obj_size_reg, Operand(object_size));
+
+ // This code stores a temporary value in t9.
+ if ((flags & RESULT_CONTAINS_TOP) == 0) {
+ // Load allocation top into result and allocation limit into t9.
+ lw(result, MemOperand(topaddr));
+ lw(t9, MemOperand(topaddr, kPointerSize));
+ } else {
+ if (FLAG_debug_code) {
+ // Assert that result actually contains top on entry. t9 is used
+ // immediately below so this use of t9 does not cause difference with
+ // respect to register content between debug and release mode.
+ lw(t9, MemOperand(topaddr));
+ Check(eq, "Unexpected allocation top", result, Operand(t9));
+ }
+ // Load allocation limit into t9. Result already contains allocation top.
+ lw(t9, MemOperand(topaddr, limit - top));
+ }
+
+ // Calculate new top and bail out if new space is exhausted. Use result
+ // to calculate the new top.
+ Addu(scratch2, result, Operand(obj_size_reg));
+ Branch(gc_required, Ugreater, scratch2, Operand(t9));
+ sw(scratch2, MemOperand(topaddr));
+
+ // Tag object if requested.
+ if ((flags & TAG_OBJECT) != 0) {
+ Addu(result, result, Operand(kHeapObjectTag));
+ }
}
+void MacroAssembler::AllocateInNewSpace(Register object_size,
+ Register result,
+ Register scratch1,
+ Register scratch2,
+ Label* gc_required,
+ AllocationFlags flags) {
+ if (!FLAG_inline_new) {
+ if (FLAG_debug_code) {
+ // Trash the registers to simulate an allocation failure.
+ li(result, 0x7091);
+ li(scratch1, 0x7191);
+ li(scratch2, 0x7291);
+ }
+ jmp(gc_required);
+ return;
+ }
-// -----------------------------------------------------------------------------
-// Activation frames
+ ASSERT(!result.is(scratch1));
+ ASSERT(!result.is(scratch2));
+ ASSERT(!scratch1.is(scratch2));
+ ASSERT(!scratch1.is(t9) && !scratch2.is(t9) && !result.is(t9));
+
+ // Check relative positions of allocation top and limit addresses.
+ // ARM adds additional checks to make sure the ldm instruction can be
+ // used. On MIPS we don't have ldm so we don't need additional checks either.
+ ExternalReference new_space_allocation_top =
+ ExternalReference::new_space_allocation_top_address(isolate());
+ ExternalReference new_space_allocation_limit =
+ ExternalReference::new_space_allocation_limit_address(isolate());
+ intptr_t top =
+ reinterpret_cast<intptr_t>(new_space_allocation_top.address());
+ intptr_t limit =
+ reinterpret_cast<intptr_t>(new_space_allocation_limit.address());
+ ASSERT((limit - top) == kPointerSize);
+
+ // Set up allocation top address and object size registers.
+ Register topaddr = scratch1;
+ li(topaddr, Operand(new_space_allocation_top));
+
+ // This code stores a temporary value in t9.
+ if ((flags & RESULT_CONTAINS_TOP) == 0) {
+ // Load allocation top into result and allocation limit into t9.
+ lw(result, MemOperand(topaddr));
+ lw(t9, MemOperand(topaddr, kPointerSize));
+ } else {
+ if (FLAG_debug_code) {
+ // Assert that result actually contains top on entry. t9 is used
+ // immediately below so this use of t9 does not cause difference with
+ // respect to register content between debug and release mode.
+ lw(t9, MemOperand(topaddr));
+ Check(eq, "Unexpected allocation top", result, Operand(t9));
+ }
+ // Load allocation limit into t9. Result already contains allocation top.
+ lw(t9, MemOperand(topaddr, limit - top));
+ }
-void MacroAssembler::SetupAlignedCall(Register scratch, int arg_count) {
- Label extra_push, end;
+ // Calculate new top and bail out if new space is exhausted. Use result
+ // to calculate the new top. Object size may be in words so a shift is
+ // required to get the number of bytes.
+ if ((flags & SIZE_IN_WORDS) != 0) {
+ sll(scratch2, object_size, kPointerSizeLog2);
+ Addu(scratch2, result, scratch2);
+ } else {
+ Addu(scratch2, result, Operand(object_size));
+ }
+ Branch(gc_required, Ugreater, scratch2, Operand(t9));
- andi(scratch, sp, 7);
+ // Update allocation top. result temporarily holds the new top.
+ if (FLAG_debug_code) {
+ And(t9, scratch2, Operand(kObjectAlignmentMask));
+ Check(eq, "Unaligned allocation in new space", t9, Operand(zero_reg));
+ }
+ sw(scratch2, MemOperand(topaddr));
- // We check for args and receiver size on the stack, all of them word sized.
- // We add one for sp, that we also want to store on the stack.
- if (((arg_count + 1) % kPointerSizeLog2) == 0) {
- Branch(ne, &extra_push, at, Operand(zero_reg));
- } else { // ((arg_count + 1) % 2) == 1
- Branch(eq, &extra_push, at, Operand(zero_reg));
+ // Tag object if requested.
+ if ((flags & TAG_OBJECT) != 0) {
+ Addu(result, result, Operand(kHeapObjectTag));
}
+}
- // Save sp on the stack.
- mov(scratch, sp);
- Push(scratch);
- b(&end);
- // Align before saving sp on the stack.
- bind(&extra_push);
- mov(scratch, sp);
- addiu(sp, sp, -8);
- sw(scratch, MemOperand(sp));
+void MacroAssembler::UndoAllocationInNewSpace(Register object,
+ Register scratch) {
+ ExternalReference new_space_allocation_top =
+ ExternalReference::new_space_allocation_top_address(isolate());
- // The stack is aligned and sp is stored on the top.
- bind(&end);
+ // Make sure the object has no tag before resetting top.
+ And(object, object, Operand(~kHeapObjectTagMask));
+#ifdef DEBUG
+ // Check that the object un-allocated is below the current top.
+ li(scratch, Operand(new_space_allocation_top));
+ lw(scratch, MemOperand(scratch));
+ Check(less, "Undo allocation of non allocated memory",
+ object, Operand(scratch));
+#endif
+ // Write the address of the object to un-allocate as the current top.
+ li(scratch, Operand(new_space_allocation_top));
+ sw(object, MemOperand(scratch));
+}
+
+
+void MacroAssembler::AllocateTwoByteString(Register result,
+ Register length,
+ Register scratch1,
+ Register scratch2,
+ Register scratch3,
+ Label* gc_required) {
+ // Calculate the number of bytes needed for the characters in the string while
+ // observing object alignment.
+ ASSERT((SeqTwoByteString::kHeaderSize & kObjectAlignmentMask) == 0);
+ sll(scratch1, length, 1); // Length in bytes, not chars.
+ addiu(scratch1, scratch1,
+ kObjectAlignmentMask + SeqTwoByteString::kHeaderSize);
+ And(scratch1, scratch1, Operand(~kObjectAlignmentMask));
+
+ // Allocate two-byte string in new space.
+ AllocateInNewSpace(scratch1,
+ result,
+ scratch2,
+ scratch3,
+ gc_required,
+ TAG_OBJECT);
+
+ // Set the map, length and hash field.
+ InitializeNewString(result,
+ length,
+ Heap::kStringMapRootIndex,
+ scratch1,
+ scratch2);
+}
+
+
+void MacroAssembler::AllocateAsciiString(Register result,
+ Register length,
+ Register scratch1,
+ Register scratch2,
+ Register scratch3,
+ Label* gc_required) {
+ // Calculate the number of bytes needed for the characters in the string
+ // while observing object alignment.
+ ASSERT((SeqAsciiString::kHeaderSize & kObjectAlignmentMask) == 0);
+ ASSERT(kCharSize == 1);
+ addiu(scratch1, length, kObjectAlignmentMask + SeqAsciiString::kHeaderSize);
+ And(scratch1, scratch1, Operand(~kObjectAlignmentMask));
+
+ // Allocate ASCII string in new space.
+ AllocateInNewSpace(scratch1,
+ result,
+ scratch2,
+ scratch3,
+ gc_required,
+ TAG_OBJECT);
+
+ // Set the map, length and hash field.
+ InitializeNewString(result,
+ length,
+ Heap::kAsciiStringMapRootIndex,
+ scratch1,
+ scratch2);
+}
+
+
+void MacroAssembler::AllocateTwoByteConsString(Register result,
+ Register length,
+ Register scratch1,
+ Register scratch2,
+ Label* gc_required) {
+ AllocateInNewSpace(ConsString::kSize,
+ result,
+ scratch1,
+ scratch2,
+ gc_required,
+ TAG_OBJECT);
+ InitializeNewString(result,
+ length,
+ Heap::kConsStringMapRootIndex,
+ scratch1,
+ scratch2);
+}
+
+
+void MacroAssembler::AllocateAsciiConsString(Register result,
+ Register length,
+ Register scratch1,
+ Register scratch2,
+ Label* gc_required) {
+ AllocateInNewSpace(ConsString::kSize,
+ result,
+ scratch1,
+ scratch2,
+ gc_required,
+ TAG_OBJECT);
+ InitializeNewString(result,
+ length,
+ Heap::kConsAsciiStringMapRootIndex,
+ scratch1,
+ scratch2);
+}
+
+
+// Allocates a heap number or jumps to the label if the young space is full and
+// a scavenge is needed.
+void MacroAssembler::AllocateHeapNumber(Register result,
Søren Thygesen Gjesse 2011/03/24 22:11:19 Indentation off.
Paul Lind 2011/03/26 18:39:17 Done here, and in several nearby places.
+ Register scratch1,
+ Register scratch2,
+ Register heap_number_map,
+ Label* need_gc) {
+ // Allocate an object in the heap for the heap number and tag it as a heap
+ // object.
+ // We ask for four more bytes to align it as we need and align the result.
+ // (HeapNumber::kSize is modified to be 4-byte bigger)
+ AllocateInNewSpace(HeapNumber::kSize,
Søren Thygesen Gjesse 2011/03/24 22:11:19 Indentation off.
Paul Lind 2011/03/26 18:39:17 Done.
+ result,
+ scratch1,
+ scratch2,
+ need_gc,
+ TAG_OBJECT);
+
+ // Align to 8 bytes. [Commented out pending code review.]
+ // __ addiu(result, result, 7-1); // -1 because result is tagged.
+ // __ And(result, result, Operand(~7));
+ // __ Or(result, result, Operand(1)); // Tag it back.
+
+#ifdef DEBUG
Søren Thygesen Gjesse 2011/03/24 22:11:19 Code in comments.
Paul Lind 2011/03/26 18:39:17 Removed. Was an early artifact of trying to align
+// // TODO(MIPS.6)
+// // Check that the result is 8-byte aligned.
+// andi(scratch2, result, Operand(7));
+// xori(scratch2, scratch2, Operand(1)); // Fail if the tag is missing.
+// Check(eq,
+// "Error in HeapNumber alloc (not 8-byte aligned or tag missing)",
+// scratch2, Operand(zero_reg));
+#endif
+
+ // Store heap number map in the allocated object.
+ AssertRegisterIsRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
+ sw(heap_number_map, FieldMemOperand(result, HeapObject::kMapOffset));
}
-void MacroAssembler::ReturnFromAlignedCall() {
- lw(sp, MemOperand(sp));
+void MacroAssembler::AllocateHeapNumberWithValue(Register result,
+ FPURegister value,
+ Register scratch1,
+ Register scratch2,
+ Label* gc_required) {
+ LoadRoot(t6, Heap::kHeapNumberMapRootIndex);
+ AllocateHeapNumber(result, scratch1, scratch2, t6, gc_required);
+ sdc1(value, FieldMemOperand(result, HeapNumber::kValueOffset));
+}
+
+
+// Copies a fixed number of fields of heap objects from src to dst.
+void MacroAssembler::CopyFields(Register dst,
+ Register src,
+ RegList temps,
+ int field_count) {
+ ASSERT((temps & dst.bit()) == 0);
+ ASSERT((temps & src.bit()) == 0);
+ // Primitive implementation using only one temporary register.
+
+ Register tmp = no_reg;
+ // Find a temp register in temps list.
+ for (int i = 0; i < kNumRegisters; i++) {
+ if ((temps & (1 << i)) != 0) {
+ tmp.code_ = i;
+ break;
+ }
+ }
+ ASSERT(!tmp.is(no_reg));
+
+ for (int i = 0; i < field_count; i++) {
+ lw(tmp, FieldMemOperand(src, i * kPointerSize));
+ sw(tmp, FieldMemOperand(dst, i * kPointerSize));
+ }
+}
+
+
+void MacroAssembler::CheckMap(Register obj,
+ Register scratch,
+ Handle<Map> map,
+ Label* fail,
+ bool is_heap_object) {
+ if (!is_heap_object) {
+ JumpIfSmi(obj, fail);
+ }
+ lw(scratch, FieldMemOperand(obj, HeapObject::kMapOffset));
+ li(at, Operand(map));
+ Branch(fail, ne, scratch, Operand(at));
+}
+
+
+void MacroAssembler::CheckMap(Register obj,
+ Register scratch,
+ Heap::RootListIndex index,
+ Label* fail,
+ bool is_heap_object) {
+ if (!is_heap_object) {
+ JumpIfSmi(obj, fail);
+ }
+ lw(scratch, FieldMemOperand(obj, HeapObject::kMapOffset));
+ LoadRoot(at, index);
+ Branch(fail, ne, scratch, Operand(at));
}
@@ -914,7 +2269,8 @@ void MacroAssembler::InvokePrologue(const ParameterCount& expected,
Handle<Code> code_constant,
Register code_reg,
Label* done,
- InvokeFlag flag) {
+ InvokeFlag flag,
+ PostCallGenerator* post_call_generator) {
bool definitely_matches = false;
Label regular_invoke;
@@ -949,11 +2305,13 @@ void MacroAssembler::InvokePrologue(const ParameterCount& expected,
li(a2, Operand(expected.immediate()));
}
}
- } else if (actual.is_immediate()) {
- Branch(eq, &regular_invoke, expected.reg(), Operand(actual.immediate()));
- li(a0, Operand(actual.immediate()));
} else {
- Branch(eq, &regular_invoke, expected.reg(), Operand(actual.reg()));
+ if (actual.is_immediate()) {
+ Branch(&regular_invoke, eq, expected.reg(), Operand(actual.immediate()));
+ li(a0, Operand(actual.immediate()));
+ } else {
+ Branch(&regular_invoke, eq, expected.reg(), Operand(actual.reg()));
+ }
}
if (!definitely_matches) {
@@ -962,25 +2320,30 @@ void MacroAssembler::InvokePrologue(const ParameterCount& expected,
addiu(a3, a3, Code::kHeaderSize - kHeapObjectTag);
}
- ExternalReference adaptor(Builtins::ArgumentsAdaptorTrampoline);
+ Handle<Code> adaptor =
+ Handle<Code>(Isolate::Current()->builtins()->builtin(
+ Builtins::ArgumentsAdaptorTrampoline));
if (flag == CALL_FUNCTION) {
- CallBuiltin(adaptor);
- b(done);
- nop();
+ Call(adaptor, RelocInfo::CODE_TARGET);
+ if (post_call_generator != NULL) post_call_generator->Generate();
+ jmp(done);
} else {
- JumpToBuiltin(adaptor);
+ Jump(adaptor, RelocInfo::CODE_TARGET);
}
bind(&regular_invoke);
}
}
+
void MacroAssembler::InvokeCode(Register code,
const ParameterCount& expected,
const ParameterCount& actual,
- InvokeFlag flag) {
+ InvokeFlag flag,
+ PostCallGenerator* post_call_generator) {
Label done;
- InvokePrologue(expected, actual, Handle<Code>::null(), code, &done, flag);
+ InvokePrologue(expected, actual, Handle<Code>::null(), code, &done, flag,
+ post_call_generator);
if (flag == CALL_FUNCTION) {
Call(code);
} else {
@@ -1014,7 +2377,8 @@ void MacroAssembler::InvokeCode(Handle<Code> code,
void MacroAssembler::InvokeFunction(Register function,
const ParameterCount& actual,
- InvokeFlag flag) {
+ InvokeFlag flag,
+ PostCallGenerator* post_call_generator) {
// Contract with called JS functions requires that function is passed in a1.
ASSERT(function.is(a1));
Register expected_reg = a2;
@@ -1025,68 +2389,120 @@ void MacroAssembler::InvokeFunction(Register function,
lw(expected_reg,
FieldMemOperand(code_reg,
SharedFunctionInfo::kFormalParameterCountOffset));
- lw(code_reg,
- MemOperand(code_reg, SharedFunctionInfo::kCodeOffset - kHeapObjectTag));
- addiu(code_reg, code_reg, Code::kHeaderSize - kHeapObjectTag);
+ sra(expected_reg, expected_reg, kSmiTagSize);
+ lw(code_reg, FieldMemOperand(a1, JSFunction::kCodeEntryOffset));
ParameterCount expected(expected_reg);
- InvokeCode(code_reg, expected, actual, flag);
+ InvokeCode(code_reg, expected, actual, flag, post_call_generator);
+}
+
+
+void MacroAssembler::InvokeFunction(JSFunction* function,
+ const ParameterCount& actual,
+ InvokeFlag flag) {
+ ASSERT(function->is_compiled());
+
+ // Get the function and setup the context.
+ li(a1, Operand(Handle<JSFunction>(function)));
+ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
+
+ // Invoke the cached code.
+ Handle<Code> code(function->code());
+ ParameterCount expected(function->shared()->formal_parameter_count());
+ if (V8::UseCrankshaft()) {
+ UNIMPLEMENTED_MIPS();
+ } else {
+ InvokeCode(code, expected, actual, RelocInfo::CODE_TARGET, flag);
+ }
+}
+
+
+void MacroAssembler::IsObjectJSObjectType(Register heap_object,
+ Register map,
+ Register scratch,
+ Label* fail) {
+ lw(map, FieldMemOperand(heap_object, HeapObject::kMapOffset));
+ IsInstanceJSObjectType(map, scratch, fail);
+}
+
+
+void MacroAssembler::IsInstanceJSObjectType(Register map,
+ Register scratch,
+ Label* fail) {
+ lbu(scratch, FieldMemOperand(map, Map::kInstanceTypeOffset));
+ Branch(fail, lt, scratch, Operand(FIRST_JS_OBJECT_TYPE));
+ Branch(fail, gt, scratch, Operand(LAST_JS_OBJECT_TYPE));
+}
+
+
+void MacroAssembler::IsObjectJSStringType(Register object,
+ Register scratch,
+ Label* fail) {
+ ASSERT(kNotStringTag != 0);
+
+ lw(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
+ lbu(scratch, FieldMemOperand(scratch, Map::kInstanceTypeOffset));
+ And(scratch, scratch, Operand(kIsNotStringMask));
+ Branch(fail, ne, scratch, Operand(zero_reg));
}
// ---------------------------------------------------------------------------
// Support functions.
- void MacroAssembler::GetObjectType(Register function,
- Register map,
- Register type_reg) {
- lw(map, FieldMemOperand(function, HeapObject::kMapOffset));
- lbu(type_reg, FieldMemOperand(map, Map::kInstanceTypeOffset));
- }
+void MacroAssembler::TryGetFunctionPrototype(Register function,
+ Register result,
+ Register scratch,
+ Label* miss) {
+ // Check that the receiver isn't a smi.
+ JumpIfSmi(function, miss);
- void MacroAssembler::CallBuiltin(ExternalReference builtin_entry) {
- // Load builtin address.
- LoadExternalReference(t9, builtin_entry);
- lw(t9, MemOperand(t9)); // Deref address.
- addiu(t9, t9, Code::kHeaderSize - kHeapObjectTag);
- // Call and allocate arguments slots.
- jalr(t9);
- // Use the branch delay slot to allocated argument slots.
- addiu(sp, sp, -StandardFrameConstants::kRArgsSlotsSize);
- addiu(sp, sp, StandardFrameConstants::kRArgsSlotsSize);
- }
+ // Check that the function really is a function. Load map into result reg.
+ GetObjectType(function, result, scratch);
+ Branch(miss, ne, scratch, Operand(JS_FUNCTION_TYPE));
+ // Make sure that the function has an instance prototype.
+ Label non_instance;
+ lbu(scratch, FieldMemOperand(result, Map::kBitFieldOffset));
+ And(scratch, scratch, Operand(1 << Map::kHasNonInstancePrototype));
+ Branch(&non_instance, ne, scratch, Operand(zero_reg));
- void MacroAssembler::CallBuiltin(Register target) {
- // Target already holds target address.
- // Call and allocate arguments slots.
- jalr(target);
- // Use the branch delay slot to allocated argument slots.
- addiu(sp, sp, -StandardFrameConstants::kRArgsSlotsSize);
- addiu(sp, sp, StandardFrameConstants::kRArgsSlotsSize);
- }
+ // Get the prototype or initial map from the function.
+ lw(result,
Søren Thygesen Gjesse 2011/03/24 22:11:19 Indentation.
Paul Lind 2011/03/26 18:39:17 Done.
+ FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
+ // If the prototype or initial map is the hole, don't return it and
+ // simply miss the cache instead. This will allow us to allocate a
+ // prototype object on-demand in the runtime system.
+ LoadRoot(t8, Heap::kTheHoleValueRootIndex);
+ Branch(miss, eq, result, Operand(t8));
- void MacroAssembler::JumpToBuiltin(ExternalReference builtin_entry) {
- // Load builtin address.
- LoadExternalReference(t9, builtin_entry);
- lw(t9, MemOperand(t9)); // Deref address.
- addiu(t9, t9, Code::kHeaderSize - kHeapObjectTag);
- // Call and allocate arguments slots.
- jr(t9);
- // Use the branch delay slot to allocated argument slots.
- addiu(sp, sp, -StandardFrameConstants::kRArgsSlotsSize);
- }
+ // If the function does not have an initial map, we're done.
+ Label done;
+ GetObjectType(result, scratch, scratch);
+ Branch(&done, ne, scratch, Operand(MAP_TYPE));
+ // Get the prototype from the initial map.
+ lw(result, FieldMemOperand(result, Map::kPrototypeOffset));
+ jmp(&done);
- void MacroAssembler::JumpToBuiltin(Register target) {
- // t9 already holds target address.
- // Call and allocate arguments slots.
- jr(t9);
- // Use the branch delay slot to allocated argument slots.
- addiu(sp, sp, -StandardFrameConstants::kRArgsSlotsSize);
- }
+ // Non-instance prototype: Fetch prototype from constructor field
+ // in initial map.
+ bind(&non_instance);
+ lw(result, FieldMemOperand(result, Map::kConstructorOffset));
+
+ // All done.
+ bind(&done);
+}
+
+
+void MacroAssembler::GetObjectType(Register object,
+ Register map,
+ Register type_reg) {
+ lw(map, FieldMemOperand(object, HeapObject::kMapOffset));
+ lbu(type_reg, FieldMemOperand(map, Map::kInstanceTypeOffset));
+}
// -----------------------------------------------------------------------------
@@ -1099,8 +2515,9 @@ void MacroAssembler::CallStub(CodeStub* stub, Condition cond,
}
-void MacroAssembler::StubReturn(int argc) {
- UNIMPLEMENTED_MIPS();
+void MacroAssembler::TailCallStub(CodeStub* stub) {
+ ASSERT(allow_stub_calls()); // stub calls are not allowed in some stubs
+ Jump(stub->GetCode(), RelocInfo::CODE_TARGET);
}
@@ -1112,7 +2529,86 @@ void MacroAssembler::IllegalOperation(int num_arguments) {
}
-void MacroAssembler::CallRuntime(Runtime::Function* f, int num_arguments) {
+void MacroAssembler::IndexFromHash(Register hash,
+ Register index) {
+ // If the hash field contains an array index pick it out. The assert checks
+ // that the constants for the maximum number of digits for an array index
+ // cached in the hash field and the number of bits reserved for it does not
+ // conflict.
+ ASSERT(TenToThe(String::kMaxCachedArrayIndexLength) <
+ (1 << String::kArrayIndexValueBits));
+ // We want the smi-tagged index in key. kArrayIndexValueMask has zeros in
+ // the low kHashShift bits.
+ STATIC_ASSERT(kSmiTag == 0);
+ Ext(hash, hash, String::kHashShift, String::kArrayIndexValueBits);
+ sll(index, hash, kSmiTagSize);
+}
+
+
+void MacroAssembler::ObjectToDoubleFPURegister(Register object,
+ FPURegister result,
+ Register scratch1,
+ Register scratch2,
+ Register heap_number_map,
+ Label* not_number,
+ ObjectToDoubleFlags flags) {
+ Label done;
+ if ((flags & OBJECT_NOT_SMI) == 0) {
+ Label not_smi;
+ JumpIfNotSmi(object, &not_smi);
+ // Remove smi tag and convert to double.
+ sra(scratch1, object, kSmiTagSize);
+ mtc1(scratch1, result);
+ cvt_d_w(result, result);
+ Branch(&done);
+ bind(&not_smi);
+ }
+ // Check for heap number and load double value from it.
+ lw(scratch1, FieldMemOperand(object, HeapObject::kMapOffset));
+ Subu(scratch2, object, Operand(kHeapObjectTag));
+ Branch(not_number, ne, scratch1, Operand(heap_number_map));
+
+ if ((flags & AVOID_NANS_AND_INFINITIES) != 0) {
+ // If exponent is all ones the number is either a NaN or +/-Infinity.
+ lw(scratch1, FieldMemOperand(object, HeapNumber::kExponentOffset));
Søren Thygesen Gjesse 2011/03/24 22:11:19 What is the purpose of this block?
Paul Lind 2011/03/26 18:39:17 There is no reason for the extra block-scope. Remo
+ {
+ // Signed bitfield extraction, based on ARM's Sbfx macro.
+ // We cannot use the ext instruction, because it doesn't sign-extend.
+ int lsb = HeapNumber::kExponentShift;
+ int width = HeapNumber::kExponentBits;
+ Register dst = scratch1;
+ Register src = scratch1;
+
+ int mask = (1 << (width + lsb)) - 1 - ((1 << lsb) - 1);
+ And(dst, src, mask);
+ int shift_up = 32 - lsb - width;
+ int shift_down = lsb + shift_up;
+ if (shift_up != 0) {
+ sll(dst, dst, shift_up);
+ }
+ if (shift_down != 0) {
+ sra(dst, dst, shift_down);
+ }
+ }
+ // All-one value sign extend to -1.
+ Branch(not_number, eq, scratch1, Operand(-1));
+ }
+ ldc1(result, MemOperand(scratch2, HeapNumber::kValueOffset));
+ bind(&done);
+}
+
+
+void MacroAssembler::SmiToDoubleFPURegister(Register smi,
+ FPURegister value,
+ Register scratch1) {
+ sra(scratch1, smi, kSmiTagSize);
+ mtc1(scratch1, value);
+ cvt_d_w(value, value);
+}
+
+
+void MacroAssembler::CallRuntime(const Runtime::Function* f,
+ int num_arguments) {
// All parameters are on the stack. v0 has the return value after call.
// If the expected number of arguments of the runtime function is
@@ -1128,69 +2624,129 @@ void MacroAssembler::CallRuntime(Runtime::Function* f, int num_arguments) {
// should remove this need and make the runtime routine entry code
// smarter.
li(a0, num_arguments);
- LoadExternalReference(a1, ExternalReference(f));
+ li(a1, Operand(ExternalReference(f, isolate())));
CEntryStub stub(1);
CallStub(&stub);
}
+void MacroAssembler::CallRuntimeSaveDoubles(Runtime::FunctionId id) {
+ const Runtime::Function* function = Runtime::FunctionForId(id);
+ li(a0, Operand(function->nargs));
+ li(a1, Operand(ExternalReference(function, isolate())));
+ CEntryStub stub(1);
+ stub.SaveDoubles();
+ CallStub(&stub);
+}
+
+
void MacroAssembler::CallRuntime(Runtime::FunctionId fid, int num_arguments) {
CallRuntime(Runtime::FunctionForId(fid), num_arguments);
}
+void MacroAssembler::CallExternalReference(const ExternalReference& ext,
+ int num_arguments) {
+ li(a0, Operand(num_arguments));
+ li(a1, Operand(ext));
+
+ CEntryStub stub(1);
+ CallStub(&stub);
+}
+
+
void MacroAssembler::TailCallExternalReference(const ExternalReference& ext,
int num_arguments,
int result_size) {
- UNIMPLEMENTED_MIPS();
+ // TODO(1236192): Most runtime routines don't need the number of
+ // arguments passed in because it is constant. At some point we
+ // should remove this need and make the runtime routine entry code
+ // smarter.
+ li(a0, Operand(num_arguments));
+ JumpToExternalReference(ext);
}
void MacroAssembler::TailCallRuntime(Runtime::FunctionId fid,
int num_arguments,
int result_size) {
- TailCallExternalReference(ExternalReference(fid), num_arguments, result_size);
+ TailCallExternalReference(ExternalReference(fid, isolate()),
+ num_arguments,
+ result_size);
}
void MacroAssembler::JumpToExternalReference(const ExternalReference& builtin) {
- UNIMPLEMENTED_MIPS();
+ li(a1, Operand(builtin));
+ CEntryStub stub(1);
+ Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
}
-Handle<Code> MacroAssembler::ResolveBuiltin(Builtins::JavaScript id,
- bool* resolved) {
- UNIMPLEMENTED_MIPS();
- return Handle<Code>(reinterpret_cast<Code*>(NULL)); // UNIMPLEMENTED RETURN
+void MacroAssembler::InvokeBuiltin(Builtins::JavaScript id,
+ InvokeJSFlags flags,
+ PostCallGenerator* post_call_generator) {
+ GetBuiltinEntry(t9, id);
+ if (flags == CALL_JS) {
+ Call(t9);
+ if (post_call_generator != NULL) post_call_generator->Generate();
+ } else {
+ ASSERT(flags == JUMP_JS);
+ Jump(t9);
+ }
}
-void MacroAssembler::InvokeBuiltin(Builtins::JavaScript id,
- InvokeJSFlags flags) {
- UNIMPLEMENTED_MIPS();
+void MacroAssembler::GetBuiltinFunction(Register target,
+ Builtins::JavaScript id) {
+ // Load the builtins object into target register.
+ lw(target, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
+ lw(target, FieldMemOperand(target, GlobalObject::kBuiltinsOffset));
+ // Load the JavaScript builtin function from the builtins object.
+ lw(target, FieldMemOperand(target,
+ JSBuiltinsObject::OffsetOfFunctionWithId(id)));
}
void MacroAssembler::GetBuiltinEntry(Register target, Builtins::JavaScript id) {
- UNIMPLEMENTED_MIPS();
+ ASSERT(!target.is(a1));
+ GetBuiltinFunction(a1, id);
+ // Load the code entry point from the builtins object.
+ lw(target, FieldMemOperand(a1, JSFunction::kCodeEntryOffset));
}
void MacroAssembler::SetCounter(StatsCounter* counter, int value,
Register scratch1, Register scratch2) {
- UNIMPLEMENTED_MIPS();
+ if (FLAG_native_code_counters && counter->Enabled()) {
+ li(scratch1, Operand(value));
+ li(scratch2, Operand(ExternalReference(counter)));
+ sw(scratch1, MemOperand(scratch2));
+ }
}
void MacroAssembler::IncrementCounter(StatsCounter* counter, int value,
Register scratch1, Register scratch2) {
- UNIMPLEMENTED_MIPS();
+ ASSERT(value > 0);
+ if (FLAG_native_code_counters && counter->Enabled()) {
+ li(scratch2, Operand(ExternalReference(counter)));
+ lw(scratch1, MemOperand(scratch2));
+ Addu(scratch1, scratch1, Operand(value));
+ sw(scratch1, MemOperand(scratch2));
+ }
}
void MacroAssembler::DecrementCounter(StatsCounter* counter, int value,
Register scratch1, Register scratch2) {
- UNIMPLEMENTED_MIPS();
+ ASSERT(value > 0);
+ if (FLAG_native_code_counters && counter->Enabled()) {
+ li(scratch2, Operand(ExternalReference(counter)));
+ lw(scratch1, MemOperand(scratch2));
+ Subu(scratch1, scratch1, Operand(value));
+ sw(scratch1, MemOperand(scratch2));
+ }
}
@@ -1199,30 +2755,144 @@ void MacroAssembler::DecrementCounter(StatsCounter* counter, int value,
void MacroAssembler::Assert(Condition cc, const char* msg,
Register rs, Operand rt) {
- UNIMPLEMENTED_MIPS();
+ if (FLAG_debug_code)
+ Check(cc, msg, rs, rt);
+}
+
+
+void MacroAssembler::AssertRegisterIsRoot(Register reg,
+ Heap::RootListIndex index) {
+ if (FLAG_debug_code) {
+ LoadRoot(at, index);
+ Check(eq, "Register did not match expected root", reg, Operand(at));
+ }
+}
+
+
+void MacroAssembler::AssertFastElements(Register elements) {
+ if (FLAG_debug_code) {
+ ASSERT(!elements.is(at));
+ Label ok;
+ Push(elements);
+ lw(elements, FieldMemOperand(elements, HeapObject::kMapOffset));
+ LoadRoot(at, Heap::kFixedArrayMapRootIndex);
+ Branch(&ok, eq, elements, Operand(at));
+ LoadRoot(at, Heap::kFixedCOWArrayMapRootIndex);
+ Branch(&ok, eq, elements, Operand(at));
+ Abort("JSObject with fast elements map has slow elements");
+ bind(&ok);
+ Pop(elements);
+ }
}
void MacroAssembler::Check(Condition cc, const char* msg,
Register rs, Operand rt) {
- UNIMPLEMENTED_MIPS();
+ Label L;
+ Branch(&L, cc, rs, rt);
+ Abort(msg);
+ // will not return here
+ bind(&L);
}
void MacroAssembler::Abort(const char* msg) {
- UNIMPLEMENTED_MIPS();
+ Label abort_start;
+ bind(&abort_start);
+ // We want to pass the msg string like a smi to avoid GC
+ // problems, however msg is not guaranteed to be aligned
+ // properly. Instead, we pass an aligned pointer that is
+ // a proper v8 smi, but also pass the alignment difference
+ // from the real pointer as a smi.
+ intptr_t p1 = reinterpret_cast<intptr_t>(msg);
+ intptr_t p0 = (p1 & ~kSmiTagMask) + kSmiTag;
+ ASSERT(reinterpret_cast<Object*>(p0)->IsSmi());
+#ifdef DEBUG
+ if (msg != NULL) {
+ RecordComment("Abort message: ");
+ RecordComment(msg);
+ }
+#endif
+ // Disable stub call restrictions to always allow calls to abort.
+ AllowStubCallsScope allow_scope(this, true);
+
+ li(a0, Operand(p0));
+ Push(a0);
+ li(a0, Operand(Smi::FromInt(p1 - p0)));
+ Push(a0);
+ CallRuntime(Runtime::kAbort, 2);
+ // will not return here
+ if (is_trampoline_pool_blocked()) {
+ // If the calling code cares about the exact number of
+ // instructions generated, we insert padding here to keep the size
+ // of the Abort macro constant.
+ // Currently in debug mode with debug_code enabled the number of
+ // generated instructions is 14, so we use this as a maximum value.
+ static const int kExpectedAbortInstructions = 14;
+ int abort_instructions = InstructionsGeneratedSince(&abort_start);
+ ASSERT(abort_instructions <= kExpectedAbortInstructions);
+ while (abort_instructions++ < kExpectedAbortInstructions) {
+ nop();
+ }
+ }
+}
+
+
+void MacroAssembler::LoadContext(Register dst, int context_chain_length) {
+ if (context_chain_length > 0) {
+ // Move up the chain of contexts to the context containing the slot.
+ lw(dst, MemOperand(cp, Context::SlotOffset(Context::CLOSURE_INDEX)));
+ // Load the function context (which is the incoming, outer context).
+ lw(dst, FieldMemOperand(dst, JSFunction::kContextOffset));
+ for (int i = 1; i < context_chain_length; i++) {
+ lw(dst, MemOperand(dst, Context::SlotOffset(Context::CLOSURE_INDEX)));
+ lw(dst, FieldMemOperand(dst, JSFunction::kContextOffset));
+ }
+ // The context may be an intermediate context, not a function context.
+ lw(dst, MemOperand(dst, Context::SlotOffset(Context::FCONTEXT_INDEX)));
+ } else { // Slot is in the current function context.
+ // The context may be an intermediate context, not a function context.
+ lw(dst, MemOperand(cp, Context::SlotOffset(Context::FCONTEXT_INDEX)));
+ }
+}
+
+
+void MacroAssembler::LoadGlobalFunction(int index, Register function) {
+ // Load the global or builtins object from the current context.
+ lw(function, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
+ // Load the global context from the global or builtins object.
+ lw(function, FieldMemOperand(function,
+ GlobalObject::kGlobalContextOffset));
+ // Load the function from the global context.
+ lw(function, MemOperand(function, Context::SlotOffset(index)));
+}
+
+
+void MacroAssembler::LoadGlobalFunctionInitialMap(Register function,
+ Register map,
+ Register scratch) {
+ // Load the initial map. The global functions all have initial maps.
+ lw(map, FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
+ if (FLAG_debug_code) {
+ Label ok, fail;
+ CheckMap(map, scratch, Heap::kMetaMapRootIndex, &fail, false);
+ Branch(&ok);
+ bind(&fail);
+ Abort("Global functions must have initial map");
+ bind(&ok);
+ }
}
void MacroAssembler::EnterFrame(StackFrame::Type type) {
addiu(sp, sp, -5 * kPointerSize);
- li(t0, Operand(Smi::FromInt(type)));
- li(t1, Operand(CodeObject()));
+ li(t8, Operand(Smi::FromInt(type)));
+ li(t9, Operand(CodeObject()));
sw(ra, MemOperand(sp, 4 * kPointerSize));
sw(fp, MemOperand(sp, 3 * kPointerSize));
sw(cp, MemOperand(sp, 2 * kPointerSize));
- sw(t0, MemOperand(sp, 1 * kPointerSize));
- sw(t1, MemOperand(sp, 0 * kPointerSize));
+ sw(t8, MemOperand(sp, 1 * kPointerSize));
+ sw(t9, MemOperand(sp, 0 * kPointerSize));
addiu(fp, sp, 3 * kPointerSize);
}
@@ -1235,62 +2905,99 @@ void MacroAssembler::LeaveFrame(StackFrame::Type type) {
}
-void MacroAssembler::EnterExitFrame(ExitFrame::Mode mode,
- Register hold_argc,
+void MacroAssembler::EnterExitFrame(Register hold_argc,
Register hold_argv,
- Register hold_function) {
- // Compute the argv pointer and keep it in a callee-saved register.
+ Register hold_function,
+ bool save_doubles) {
// a0 is argc.
- sll(t0, a0, kPointerSizeLog2);
- add(hold_argv, sp, t0);
- addi(hold_argv, hold_argv, -kPointerSize);
+ sll(t8, a0, kPointerSizeLog2);
+ addu(hold_argv, sp, t8);
+ addiu(hold_argv, hold_argv, -kPointerSize);
// Compute callee's stack pointer before making changes and save it as
- // t1 register so that it is restored as sp register on exit, thereby
+ // t9 register so that it is restored as sp register on exit, thereby
// popping the args.
- // t1 = sp + kPointerSize * #args
- add(t1, sp, t0);
+ // t9 = sp + kPointerSize * #args
+ addu(t9, sp, t8);
+
+ // Compute the argv pointer and keep it in a callee-saved register.
+ // This only seems to be needed for crankshaft and may cause problems
+ // so it's disabled for now.
+ // Subu(s6, t9, Operand(kPointerSize));
// Align the stack at this point.
AlignStack(0);
// Save registers.
addiu(sp, sp, -12);
- sw(t1, MemOperand(sp, 8));
+ sw(t9, MemOperand(sp, 8));
sw(ra, MemOperand(sp, 4));
sw(fp, MemOperand(sp, 0));
mov(fp, sp); // Setup new frame pointer.
- // Push debug marker.
- if (mode == ExitFrame::MODE_DEBUG) {
- Push(zero_reg);
- } else {
- li(t0, Operand(CodeObject()));
- Push(t0);
- }
+ li(t8, Operand(CodeObject()));
+ Push(t8); // Accessed from ExitFrame::code_slot.
// Save the frame pointer and the context in top.
- LoadExternalReference(t0, ExternalReference(Isolate::k_c_entry_fp_address));
- sw(fp, MemOperand(t0));
- LoadExternalReference(t0, ExternalReference(Isolate::k_context_address));
- sw(cp, MemOperand(t0));
+ li(t8, Operand(ExternalReference(Isolate::k_c_entry_fp_address, isolate())));
+ sw(fp, MemOperand(t8));
+ li(t8, Operand(ExternalReference(Isolate::k_context_address, isolate())));
+ sw(cp, MemOperand(t8));
// Setup argc and the builtin function in callee-saved registers.
mov(hold_argc, a0);
mov(hold_function, a1);
+
+ // Optionally save all double registers.
+ if (save_doubles) {
+#ifdef DEBUG
+ int frame_alignment = ActivationFrameAlignment();
+#endif
Søren Thygesen Gjesse 2011/03/24 22:11:19 The comment about vstrm is ARM specific.
Paul Lind 2011/03/26 18:39:17 Done.
+ // TODO(regis): Use vstrm instruction.
+ // The stack alignment code above made sp unaligned, so add space for one
+ // more double register and use aligned addresses.
+ ASSERT(kDoubleSize == frame_alignment);
+ // Mark the frame as containing doubles by pushing a non-valid return
+ // address, i.e. 0.
+ ASSERT(ExitFrameConstants::kMarkerOffset == -2 * kPointerSize);
+ push(zero_reg); // Marker and alignment word.
+ int space = FPURegister::kNumRegisters * kDoubleSize + kPointerSize;
+ Subu(sp, sp, Operand(space));
+ // Remember: we only need to save every 2nd double FPU value.
+ for (int i = 0; i < FPURegister::kNumRegisters; i+=2) {
+ FPURegister reg = FPURegister::from_code(i);
+ sdc1(reg, MemOperand(sp, i * kDoubleSize + kPointerSize));
+ }
+ // Note that f0 will be accessible at fp - 2*kPointerSize -
+ // FPURegister::kNumRegisters * kDoubleSize, since the code slot and the
+ // alignment word were pushed after the fp.
+ }
}
-void MacroAssembler::LeaveExitFrame(ExitFrame::Mode mode) {
+void MacroAssembler::LeaveExitFrame(bool save_doubles) {
+ // Optionally restore all double registers.
+ if (save_doubles) {
+ // TODO(regis): Use vldrm instruction.
+ // Remember: we only need to restore every 2nd double FPU value.
+ for (int i = 0; i < FPURegister::kNumRegisters; i+=2) {
+ FPURegister reg = FPURegister::from_code(i);
+ // Register f30-f31 is just below the marker.
+ const int offset = ExitFrameConstants::kMarkerOffset;
+ ldc1(reg, MemOperand(fp,
+ (i - FPURegister::kNumRegisters) * kDoubleSize + offset));
+ }
+ }
+
// Clear top frame.
- LoadExternalReference(t0, ExternalReference(Isolate::k_c_entry_fp_address));
- sw(zero_reg, MemOperand(t0));
+ li(t8, Operand(ExternalReference(Isolate::k_c_entry_fp_address, isolate())));
+ sw(zero_reg, MemOperand(t8));
// Restore current context from top and clear it in debug mode.
- LoadExternalReference(t0, ExternalReference(Isolate::k_context_address));
- lw(cp, MemOperand(t0));
+ li(t8, Operand(ExternalReference(Isolate::k_context_address, isolate())));
+ lw(cp, MemOperand(t8));
#ifdef DEBUG
- sw(a3, MemOperand(t0));
+ sw(a3, MemOperand(t8));
#endif
// Pop the arguments, restore registers, and return.
@@ -1303,24 +3010,362 @@ void MacroAssembler::LeaveExitFrame(ExitFrame::Mode mode) {
}
+void MacroAssembler::InitializeNewString(Register string,
+ Register length,
+ Heap::RootListIndex map_index,
+ Register scratch1,
+ Register scratch2) {
+ sll(scratch1, length, kSmiTagSize);
+ LoadRoot(scratch2, map_index);
+ sw(scratch1, FieldMemOperand(string, String::kLengthOffset));
+ li(scratch1, Operand(String::kEmptyHashField));
+ sw(scratch2, FieldMemOperand(string, HeapObject::kMapOffset));
+ sw(scratch1, FieldMemOperand(string, String::kHashFieldOffset));
+}
+
+
+int MacroAssembler::ActivationFrameAlignment() {
+#if defined(V8_HOST_ARCH_MIPS)
+ // Running on the real platform. Use the alignment as mandated by the local
+ // environment.
+ // Note: This will break if we ever start generating snapshots on one ARM
+ // platform for another ARM platform with a different alignment.
+ return OS::ActivationFrameAlignment();
+#else // defined(V8_HOST_ARCH_MIPS)
+ // If we are using the simulator then we should always align to the expected
+ // alignment. As the simulator is used to generate snapshots we do not know
+ // if the target platform will need alignment, so this is controlled from a
+ // flag.
+ // return FLAG_sim_stack_alignment; // TODO(REBASE): uncomment
+ return 2 * kPointerSize; // TODO(REBASE): use above flog & remove this line.
Søren Thygesen Gjesse 2011/03/24 22:11:19 REBASE -> mips, flog -> flag
Paul Lind 2011/03/26 18:39:17 Deleted that line, and started using FLAG_sim_Stac
+#endif // defined(V8_HOST_ARCH_MIPS)
+}
+
+
void MacroAssembler::AlignStack(int offset) {
// On MIPS an offset of 0 aligns to 0 modulo 8 bytes,
// and an offset of 1 aligns to 4 modulo 8 bytes.
+#if defined(V8_HOST_ARCH_MIPS)
+ // Running on the real platform. Use the alignment as mandated by the local
+ // environment.
+ // Note: This will break if we ever start generating snapshots on one MIPS
+ // platform for another MIPS platform with a different alignment.
int activation_frame_alignment = OS::ActivationFrameAlignment();
+#else // defined(V8_HOST_ARCH_MIPS)
+ // If we are using the simulator then we should always align to the expected
+ // alignment. As the simulator is used to generate snapshots we do not know
+ // if the target platform will need alignment, so we will always align at
+ // this point here.
+ int activation_frame_alignment = 2 * kPointerSize;
+#endif // defined(V8_HOST_ARCH_MIPS)
if (activation_frame_alignment != kPointerSize) {
// This code needs to be made more general if this assert doesn't hold.
ASSERT(activation_frame_alignment == 2 * kPointerSize);
if (offset == 0) {
- andi(t0, sp, activation_frame_alignment - 1);
- Push(zero_reg, eq, t0, zero_reg);
+ andi(t8, sp, activation_frame_alignment - 1);
+ Push(zero_reg, eq, t8, zero_reg);
} else {
- andi(t0, sp, activation_frame_alignment - 1);
- addiu(t0, t0, -4);
- Push(zero_reg, eq, t0, zero_reg);
+ andi(t8, sp, activation_frame_alignment - 1);
+ addiu(t8, t8, -4);
+ Push(zero_reg, eq, t8, zero_reg);
}
}
}
+
+
+void MacroAssembler::JumpIfNotPowerOfTwoOrZero(
+ Register reg,
+ Register scratch,
+ Label* not_power_of_two_or_zero) {
+ Subu(scratch, reg, Operand(1));
+ Branch(not_power_of_two_or_zero, lt, scratch, Operand(zero_reg), false);
+ and_(at, scratch, reg); // In the delay slot.
+ Branch(not_power_of_two_or_zero, ne, at, Operand(zero_reg));
+}
+
+
+void MacroAssembler::JumpIfNotBothSmi(Register reg1,
+ Register reg2,
+ Label* on_not_both_smi) {
+ STATIC_ASSERT(kSmiTag == 0);
+ ASSERT_EQ(1, kSmiTagMask);
+ or_(at, reg1, reg2);
+ andi(at, at, kSmiTagMask);
+ Branch(on_not_both_smi, ne, at, Operand(zero_reg));
+}
+
+
+void MacroAssembler::JumpIfEitherSmi(Register reg1,
+ Register reg2,
+ Label* on_either_smi) {
+ STATIC_ASSERT(kSmiTag == 0);
+ ASSERT_EQ(1, kSmiTagMask);
+ // Both Smi tags must be 1 (not Smi).
+ and_(at, reg1, reg2);
+ andi(at, at, kSmiTagMask);
+ Branch(on_either_smi, eq, at, Operand(zero_reg));
+}
+
+
+void MacroAssembler::AbortIfSmi(Register object) {
+ STATIC_ASSERT(kSmiTag == 0);
+ andi(at, object, kSmiTagMask);
+ Assert(ne, "Operand is a smi", at, Operand(zero_reg));
+}
+
+
+void MacroAssembler::AbortIfNotSmi(Register object) {
+ STATIC_ASSERT(kSmiTag == 0);
+ andi(at, object, kSmiTagMask);
+ Assert(eq, "Operand is a smi", at, Operand(zero_reg));
+}
+
+
+void MacroAssembler::AbortIfNotRootValue(Register src,
+ Heap::RootListIndex root_value_index,
+ const char* message) {
+ ASSERT(!src.is(at));
+ LoadRoot(at, root_value_index);
+ Assert(eq, message, src, Operand(at));
+}
+
+
+void MacroAssembler::JumpIfNotHeapNumber(Register object,
+ Register heap_number_map,
+ Register scratch,
+ Label* on_not_heap_number) {
+ lw(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
+ AssertRegisterIsRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
+ Branch(on_not_heap_number, ne, scratch, Operand(heap_number_map));
+}
+
+
+void MacroAssembler::JumpIfNonSmisNotBothSequentialAsciiStrings(
+ Register first,
+ Register second,
+ Register scratch1,
+ Register scratch2,
+ Label* failure) {
+ // Test that both first and second are sequential ASCII strings.
+ // Assume that they are non-smis.
+ lw(scratch1, FieldMemOperand(first, HeapObject::kMapOffset));
+ lw(scratch2, FieldMemOperand(second, HeapObject::kMapOffset));
+ lbu(scratch1, FieldMemOperand(scratch1, Map::kInstanceTypeOffset));
+ lbu(scratch2, FieldMemOperand(scratch2, Map::kInstanceTypeOffset));
+
+ JumpIfBothInstanceTypesAreNotSequentialAscii(scratch1,
+ scratch2,
+ scratch1,
+ scratch2,
+ failure);
+}
+
+
+void MacroAssembler::JumpIfNotBothSequentialAsciiStrings(Register first,
+ Register second,
+ Register scratch1,
+ Register scratch2,
+ Label* failure) {
+ // Check that neither is a smi.
+ STATIC_ASSERT(kSmiTag == 0);
+ And(scratch1, first, Operand(second));
+ And(scratch1, scratch1, Operand(kSmiTagMask));
+ Branch(failure, eq, scratch1, Operand(zero_reg));
+ JumpIfNonSmisNotBothSequentialAsciiStrings(first,
+ second,
+ scratch1,
+ scratch2,
+ failure);
+}
+
+
+void MacroAssembler::JumpIfBothInstanceTypesAreNotSequentialAscii(
+ Register first,
+ Register second,
+ Register scratch1,
+ Register scratch2,
+ Label* failure) {
+ int kFlatAsciiStringMask =
+ kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask;
+ int kFlatAsciiStringTag = ASCII_STRING_TYPE;
+ ASSERT(kFlatAsciiStringTag <= 0xffff); // Ensure this fits 16-bit immed.
+ andi(scratch1, first, kFlatAsciiStringMask);
+ Branch(failure, ne, scratch1, Operand(kFlatAsciiStringTag));
+ andi(scratch2, second, kFlatAsciiStringMask);
+ Branch(failure, ne, scratch2, Operand(kFlatAsciiStringTag));
+}
+
+
+void MacroAssembler::JumpIfInstanceTypeIsNotSequentialAscii(Register type,
+ Register scratch,
+ Label* failure) {
+ int kFlatAsciiStringMask =
+ kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask;
+ int kFlatAsciiStringTag = ASCII_STRING_TYPE;
+ And(scratch, type, Operand(kFlatAsciiStringMask));
+ Branch(failure, ne, scratch, Operand(kFlatAsciiStringTag));
+}
+
+
+static const int kRegisterPassedArguments = 4;
+
+void MacroAssembler::PrepareCallCFunction(int num_arguments, Register scratch) {
+ int frame_alignment = ActivationFrameAlignment();
+
+ // Reserve space for Isolate address which is always passed as last parameter
+ num_arguments += 1;
+
+ // Up to four simple arguments are passed in registers a0..a3.
+ // Those four arguments must have reserved argument slots on the stack for
+ // mips, even though those argument slots are not normally used.
+ // Remaining arguments are pushed on the stack, above (higher address than)
+ // the argument slots.
+ ASSERT(StandardFrameConstants::kCArgsSlotsSize % kPointerSize == 0);
+ int stack_passed_arguments = ((num_arguments <= kRegisterPassedArguments) ?
+ 0 : num_arguments - kRegisterPassedArguments) +
+ (StandardFrameConstants::kCArgsSlotsSize /
+ kPointerSize);
+ if (frame_alignment > kPointerSize) {
+ // Make stack end at alignment and make room for num_arguments - 4 words
+ // and the original value of sp.
+ mov(scratch, sp);
+ Subu(sp, sp, Operand((stack_passed_arguments + 1) * kPointerSize));
+ ASSERT(IsPowerOf2(frame_alignment));
+ And(sp, sp, Operand(-frame_alignment));
+ sw(scratch, MemOperand(sp, stack_passed_arguments * kPointerSize));
+ } else {
+ Subu(sp, sp, Operand(stack_passed_arguments * kPointerSize));
+ }
+}
+
+
+void MacroAssembler::CallCFunction(ExternalReference function,
+ int num_arguments) {
+ CallCFunctionHelper(no_reg, function, at, num_arguments);
+}
+
+
+void MacroAssembler::CallCFunction(Register function,
+ Register scratch,
+ int num_arguments) {
+ CallCFunctionHelper(function,
+ ExternalReference::the_hole_value_location(isolate()),
+ scratch,
+ num_arguments);
+}
+
+
+void MacroAssembler::CallCFunctionHelper(Register function,
+ ExternalReference function_reference,
+ Register scratch,
+ int num_arguments) {
+ // Push Isolate address as the last argument.
+ if (num_arguments < kRegisterPassedArguments) {
+ Register arg_to_reg[] = {a0, a1, a2, a3};
+ Register r = arg_to_reg[num_arguments];
+ li(r, Operand(ExternalReference::isolate_address()));
+ } else {
+ int stack_passed_arguments = num_arguments - kRegisterPassedArguments +
+ (StandardFrameConstants::kCArgsSlotsSize /
+ kPointerSize);
+ // Push Isolate address on the stack after the arguments.
+ li(scratch, Operand(ExternalReference::isolate_address()));
+ sw(scratch, MemOperand(sp, stack_passed_arguments * kPointerSize));
+ }
+ num_arguments += 1;
+
+ // Make sure that the stack is aligned before calling a C function unless
+ // running in the simulator. The simulator has its own alignment check which
+ // provides more information.
+ // The argument stots are presumed to have been set up by
+ // PrepareCallCFunction. The C function must be called via t9, for mips ABI.
+
+#if defined(V8_HOST_ARCH_MIPS)
+ if (emit_debug_code()) {
+ int frame_alignment = OS::ActivationFrameAlignment();
+ int frame_alignment_mask = frame_alignment - 1;
+ if (frame_alignment > kPointerSize) {
+ ASSERT(IsPowerOf2(frame_alignment));
+ Label alignment_as_expected;
+ And(at, sp, Operand(frame_alignment_mask));
+ Branch(&alignment_as_expected, eq, at, Operand(zero_reg));
+ // Don't use Check here, as it will call Runtime_Abort possibly
+ // re-entering here.
+ stop("Unexpected alignment in CallCFunction");
+ bind(&alignment_as_expected);
+ }
+ }
+#endif // V8_HOST_ARCH_MIPS
+
+ // Just call directly. The function called cannot cause a GC, or
+ // allow preemption, so the return address in the link register
+ // stays correct.
+ if (!function.is(t9)) {
+ mov(t9, function);
+ function = t9;
+ }
+
+ if (function.is(no_reg)) {
+ li(t9, Operand(function_reference));
+ function = t9;
+ }
+
+ Call(function);
+
+ ASSERT(StandardFrameConstants::kCArgsSlotsSize % kPointerSize == 0);
+ int stack_passed_arguments = ((num_arguments <= kRegisterPassedArguments) ?
+ 0 : num_arguments - kRegisterPassedArguments) +
+ (StandardFrameConstants::kCArgsSlotsSize /
+ kPointerSize);
+
+ if (OS::ActivationFrameAlignment() > kPointerSize) {
+ lw(sp, MemOperand(sp, stack_passed_arguments * kPointerSize));
+ } else {
+ Addu(sp, sp, Operand(stack_passed_arguments * sizeof(kPointerSize)));
+ }
+}
+
+
+#undef BRANCH_ARGS_CHECK
+
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+CodePatcher::CodePatcher(byte* address, int instructions)
+ : address_(address),
+ instructions_(instructions),
+ size_(instructions * Assembler::kInstrSize),
+ masm_(address, size_ + Assembler::kGap) {
+ // Create a new macro assembler pointing to the address of the code to patch.
+ // The size is adjusted with kGap on order for the assembler to generate size
+ // bytes of instructions without failing with buffer size constraints.
+ ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
+}
+
+
+CodePatcher::~CodePatcher() {
+ // Indicate that code has changed.
+ CPU::FlushICache(address_, size_);
+
+ // Check that the code was patched as expected.
+ ASSERT(masm_.pc_ == address_ + size_);
+ ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
+}
+
+
+void CodePatcher::Emit(Instr x) {
+ masm()->emit(x);
+}
+
+
+void CodePatcher::Emit(Address addr) {
+ masm()->emit(reinterpret_cast<Instr>(addr));
+}
+
+
+#endif // ENABLE_DEBUGGER_SUPPORT
+
+
} } // namespace v8::internal
#endif // V8_TARGET_ARCH_MIPS
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