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Change GenerateLoadStringLength to have two scratch registers on all platforms. This is needed so that the LoadIC can pass the receiver in a register, and not have it overwritten, and also simplifies the code.

Browse Source 
Review URL: http://codereview.chromium.org/596011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3820 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
whesse@chromium.org 2010-02-09 13:06:37 +00:00
parent df1df78c48
commit 503bbeb8c4
7 changed files with 24 additions and 25 deletions
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2
src/arm/ic-arm.cc
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@ -190,7 +190,7 @@ void LoadIC::GenerateStringLength(MacroAssembler* masm) {
__ ldr(r0, MemOperand(sp, 0));
StubCompiler::GenerateLoadStringLength2(masm, r0, r1, r3, &miss);
StubCompiler::GenerateLoadStringLength(masm, r0, r1, r3, &miss);
// Cache miss: Jump to runtime.
__ bind(&miss);
StubCompiler::GenerateLoadMiss(masm, Code::LOAD_IC);

12
src/arm/stub-cache-arm.cc
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@ -215,11 +215,11 @@ static void GenerateStringCheck(MacroAssembler* masm,
// If the receiver object is not a string or a wrapped string object the
// execution continues at the miss label. The register containing the
// receiver is potentially clobbered.
void StubCompiler::GenerateLoadStringLength2(MacroAssembler* masm,
Register receiver,
Register scratch1,
Register scratch2,
Label* miss) {
void StubCompiler::GenerateLoadStringLength(MacroAssembler* masm,
Register receiver,
Register scratch1,
Register scratch2,
Label* miss) {
Label check_string, check_wrapper;
__ bind(&check_string);
@ -1672,7 +1672,7 @@ Object* KeyedLoadStubCompiler::CompileLoadStringLength(String* name) {
__ cmp(r2, Operand(Handle<String>(name)));
__ b(ne, &miss);
GenerateLoadStringLength2(masm(), r0, r1, r3, &miss);
GenerateLoadStringLength(masm(), r0, r1, r3, &miss);
__ bind(&miss);
__ DecrementCounter(&Counters::keyed_load_string_length, 1, r1, r3);

2
src/ia32/ic-ia32.cc
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@ -200,7 +200,7 @@ void LoadIC::GenerateStringLength(MacroAssembler* masm) {
__ mov(eax, Operand(esp, kPointerSize));
StubCompiler::GenerateLoadStringLength(masm, eax, edx, &miss);
StubCompiler::GenerateLoadStringLength(masm, eax, edx, ebx, &miss);
__ bind(&miss);
StubCompiler::GenerateLoadMiss(masm, Code::LOAD_IC);
}

13
src/ia32/stub-cache-ia32.cc
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@ -226,13 +226,14 @@ static void GenerateStringCheck(MacroAssembler* masm,
void StubCompiler::GenerateLoadStringLength(MacroAssembler* masm,
Register receiver,
Register scratch,
Register scratch1,
Register scratch2,
Label* miss) {
Label load_length, check_wrapper;
// Check if the object is a string leaving the instance type in the
// scratch register.
GenerateStringCheck(masm, receiver, scratch, miss, &check_wrapper);
GenerateStringCheck(masm, receiver, scratch1, miss, &check_wrapper);
// Load length from the string and convert to a smi.
__ bind(&load_length);
@ -242,13 +243,13 @@ void StubCompiler::GenerateLoadStringLength(MacroAssembler* masm,
// Check if the object is a JSValue wrapper.
__ bind(&check_wrapper);
__ cmp(scratch, JS_VALUE_TYPE);
__ cmp(scratch1, JS_VALUE_TYPE);
__ j(not_equal, miss, not_taken);
// Check if the wrapped value is a string and load the length
// directly if it is.
__ mov(receiver, FieldOperand(receiver, JSValue::kValueOffset));
GenerateStringCheck(masm, receiver, scratch, miss, miss);
__ mov(scratch2, FieldOperand(receiver, JSValue::kValueOffset));
GenerateStringCheck(masm, scratch2, scratch1, miss, miss);
__ jmp(&load_length);
}
@ -1773,7 +1774,7 @@ Object* KeyedLoadStubCompiler::CompileLoadStringLength(String* name) {
__ cmp(Operand(eax), Immediate(Handle<String>(name)));
__ j(not_equal, &miss, not_taken);
GenerateLoadStringLength(masm(), ecx, edx, &miss);
GenerateLoadStringLength(masm(), ecx, edx, ebx, &miss);
__ bind(&miss);
__ DecrementCounter(&Counters::keyed_load_string_length, 1);
GenerateLoadMiss(masm(), Code::KEYED_LOAD_IC);

4
src/stub-cache.h
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@ -355,10 +355,6 @@ class StubCompiler BASE_EMBEDDED {
Register scratch,
Label* miss_label);
static void GenerateLoadStringLength(MacroAssembler* masm,
Register receiver,
Register scratch,
Label* miss_label);
static void GenerateLoadStringLength2(MacroAssembler* masm,
Register receiver,
Register scratch1,
Register scratch2,

2
src/x64/ic-x64.cc
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@ -1302,7 +1302,7 @@ void LoadIC::GenerateStringLength(MacroAssembler* masm) {
__ movq(rax, Operand(rsp, kPointerSize));
StubCompiler::GenerateLoadStringLength(masm, rax, rdx, &miss);
StubCompiler::GenerateLoadStringLength(masm, rax, rdx, rbx, &miss);
__ bind(&miss);
StubCompiler::GenerateLoadMiss(masm, Code::LOAD_IC);
}

14
src/x64/stub-cache-x64.cc
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@ -314,13 +314,14 @@ static void GenerateStringCheck(MacroAssembler* masm,
void StubCompiler::GenerateLoadStringLength(MacroAssembler* masm,
Register receiver,
Register scratch,
Register scratch1,
Register scratch2,
Label* miss) {
Label load_length, check_wrapper;
// Check if the object is a string leaving the instance type in the
// scratch register.
GenerateStringCheck(masm, receiver, scratch, miss, &check_wrapper);
GenerateStringCheck(masm, receiver, scratch1, miss, &check_wrapper);
// Load length directly from the string.
__ bind(&load_length);
@ -330,13 +331,14 @@ void StubCompiler::GenerateLoadStringLength(MacroAssembler* masm,
// Check if the object is a JSValue wrapper.
__ bind(&check_wrapper);
__ cmpl(scratch, Immediate(JS_VALUE_TYPE));
__ cmpl(scratch1, Immediate(JS_VALUE_TYPE));
__ j(not_equal, miss);
// Check if the wrapped value is a string and load the length
// directly if it is.
__ movq(receiver, FieldOperand(receiver, JSValue::kValueOffset));
GenerateStringCheck(masm, receiver, scratch, miss, miss);
__ movq(scratch2, FieldOperand(receiver, JSValue::kValueOffset));
GenerateStringCheck(masm, scratch2, scratch1, miss, miss);
__ movq(receiver, scratch2);
__ jmp(&load_length);
}
@ -1325,7 +1327,7 @@ Object* KeyedLoadStubCompiler::CompileLoadStringLength(String* name) {
__ Cmp(rax, Handle<String>(name));
__ j(not_equal, &miss);
GenerateLoadStringLength(masm(), rcx, rdx, &miss);
GenerateLoadStringLength(masm(), rcx, rdx, rbx, &miss);
__ bind(&miss);
__ DecrementCounter(&Counters::keyed_load_string_length, 1);
GenerateLoadMiss(masm(), Code::KEYED_LOAD_IC);