Reviewers: Yang,
Description:
Make kAsciiDataHintTag have correct semantics for all both 1 and 2 byte
string
types.
BUG=
Please review this at https://codereview.chromium.org/11361171/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files:
M src/arm/code-stubs-arm.cc
M src/ia32/code-stubs-ia32.cc
M src/objects-inl.h
M src/objects.h
M src/x64/code-stubs-x64.cc
Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index
1e73a55871606f4ce7b2708b856ef6e2e9a3f9d8..5558c55122a7cf781c60cea1b9fabd7c085d7f99
100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -6498,11 +6498,6 @@ void StringAddStub::Generate(MacroAssembler* masm) {
__ tst(r4, Operand(kAsciiDataHintMask));
__ tst(r5, Operand(kAsciiDataHintMask), ne);
__ b(ne, &ascii_data);
- __ eor(r4, r4, Operand(r5));
- STATIC_ASSERT(kOneByteStringTag != 0 && kAsciiDataHintTag != 0);
- __ and_(r4, r4, Operand(kOneByteStringTag | kAsciiDataHintTag));
- __ cmp(r4, Operand(kOneByteStringTag | kAsciiDataHintTag));
- __ b(eq, &ascii_data);
// Allocate a two byte cons string.
__ AllocateTwoByteConsString(r7, r6, r4, r5, &call_runtime);
Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index
7ea71e47eb059b1cf788c2970eddc211e00a5a02..fb8501039497a984572c1bf2894ce679f3fbbb20
100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -5748,13 +5748,6 @@ void StringAddStub::Generate(MacroAssembler* masm) {
// edi: second instance type.
__ test(ecx, Immediate(kAsciiDataHintMask));
__ j(not_zero, &ascii_data);
- __ mov(ecx, FieldOperand(eax, HeapObject::kMapOffset));
- __ movzx_b(ecx, FieldOperand(ecx, Map::kInstanceTypeOffset));
- __ xor_(edi, ecx);
- STATIC_ASSERT(kOneByteStringTag != 0 && kAsciiDataHintTag != 0);
- __ and_(edi, kOneByteStringTag | kAsciiDataHintTag);
- __ cmp(edi, kOneByteStringTag | kAsciiDataHintTag);
- __ j(equal, &ascii_data);
// Allocate a two byte cons string.
__ AllocateTwoByteConsString(ecx, edi, no_reg, &call_runtime);
__ jmp(&allocated);
Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index
a88b83afeae62836764946ff30ef194f3526eb72..b7a3ced1630698ffd7218d3e9d33805da5c408d3
100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -341,8 +341,7 @@ bool String::IsTwoByteRepresentationUnderneath() {
bool String::HasOnlyAsciiChars() {
uint32_t type = map()->instance_type();
- return (type & kStringEncodingMask) == kOneByteStringTag ||
- (type & kAsciiDataHintMask) == kAsciiDataHintTag;
+ return (type & kAsciiDataHintMask) == kAsciiDataHintTag;
}
Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index
2f13e96a26ff7cc5bd1f809229899d666e6fbb39..a9b1fe4737eebed5c5f022ba1d20e12105905b96
100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -530,39 +530,46 @@ const uint32_t kShortcutTypeTag = kConsStringTag;
enum InstanceType {
// String types.
SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kSeqStringTag,
- ASCII_SYMBOL_TYPE = kOneByteStringTag | kSymbolTag | kSeqStringTag,
+ ASCII_SYMBOL_TYPE = kOneByteStringTag | kAsciiDataHintTag | kSymbolTag |
+ kSeqStringTag,
CONS_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kConsStringTag,
- CONS_ASCII_SYMBOL_TYPE = kOneByteStringTag | kSymbolTag | kConsStringTag,
+ CONS_ASCII_SYMBOL_TYPE = kOneByteStringTag | kAsciiDataHintTag |
kSymbolTag |
+ kConsStringTag,
SHORT_EXTERNAL_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag |
kExternalStringTag |
kShortExternalStringTag,
SHORT_EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE =
kTwoByteStringTag | kSymbolTag | kExternalStringTag |
kAsciiDataHintTag | kShortExternalStringTag,
- SHORT_EXTERNAL_ASCII_SYMBOL_TYPE = kOneByteStringTag |
kExternalStringTag |
- kSymbolTag | kShortExternalStringTag,
+ SHORT_EXTERNAL_ASCII_SYMBOL_TYPE = kOneByteStringTag | kAsciiDataHintTag
|
+ kExternalStringTag | kSymbolTag |
+ kShortExternalStringTag,
EXTERNAL_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag |
kExternalStringTag,
EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE =
kTwoByteStringTag | kSymbolTag | kExternalStringTag |
kAsciiDataHintTag,
EXTERNAL_ASCII_SYMBOL_TYPE =
- kOneByteStringTag | kSymbolTag | kExternalStringTag,
+ kOneByteStringTag | kAsciiDataHintTag | kSymbolTag |
kExternalStringTag,
STRING_TYPE = kTwoByteStringTag | kSeqStringTag,
- ASCII_STRING_TYPE = kOneByteStringTag | kSeqStringTag,
+ ASCII_STRING_TYPE = kOneByteStringTag | kAsciiDataHintTag |
kSeqStringTag,
CONS_STRING_TYPE = kTwoByteStringTag | kConsStringTag,
- CONS_ASCII_STRING_TYPE = kOneByteStringTag | kConsStringTag,
+ CONS_ASCII_STRING_TYPE =
+ kOneByteStringTag | kAsciiDataHintTag | kConsStringTag,
SLICED_STRING_TYPE = kTwoByteStringTag | kSlicedStringTag,
- SLICED_ASCII_STRING_TYPE = kOneByteStringTag | kSlicedStringTag,
+ SLICED_ASCII_STRING_TYPE =
+ kOneByteStringTag | kAsciiDataHintTag | kSlicedStringTag,
SHORT_EXTERNAL_STRING_TYPE =
kTwoByteStringTag | kExternalStringTag | kShortExternalStringTag,
SHORT_EXTERNAL_STRING_WITH_ASCII_DATA_TYPE =
kTwoByteStringTag | kExternalStringTag |
kAsciiDataHintTag | kShortExternalStringTag,
SHORT_EXTERNAL_ASCII_STRING_TYPE =
- kOneByteStringTag | kExternalStringTag | kShortExternalStringTag,
+ kOneByteStringTag | kAsciiDataHintTag |
+ kExternalStringTag | kShortExternalStringTag,
EXTERNAL_STRING_TYPE = kTwoByteStringTag | kExternalStringTag,
EXTERNAL_STRING_WITH_ASCII_DATA_TYPE =
kTwoByteStringTag | kExternalStringTag | kAsciiDataHintTag,
// LAST_STRING_TYPE
- EXTERNAL_ASCII_STRING_TYPE = kOneByteStringTag | kExternalStringTag,
+ EXTERNAL_ASCII_STRING_TYPE =
+ kOneByteStringTag | kAsciiDataHintTag | kExternalStringTag,
PRIVATE_EXTERNAL_ASCII_STRING_TYPE = EXTERNAL_ASCII_STRING_TYPE,
// Objects allocated in their own spaces (never in new space).
Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index
a8e52e99d306d0cedb44ab9f4ef74eedd10d85c0..9c9a266ac53cbef1eed6ac7a4dc238412ef9ffe9
100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -4765,11 +4765,6 @@ void StringAddStub::Generate(MacroAssembler* masm) {
// r9: second instance type.
__ testb(rcx, Immediate(kAsciiDataHintMask));
__ j(not_zero, &ascii_data);
- __ xor_(r8, r9);
- STATIC_ASSERT(kOneByteStringTag != 0 && kAsciiDataHintTag != 0);
- __ andb(r8, Immediate(kOneByteStringTag | kAsciiDataHintTag));
- __ cmpb(r8, Immediate(kOneByteStringTag | kAsciiDataHintTag));
- __ j(equal, &ascii_data);
// Allocate a two byte cons string.
__ AllocateTwoByteConsString(rcx, rdi, no_reg, &call_runtime);
__ jmp(&allocated);
--
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