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Added support for assignments to global variables in the toplevel code

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generator.  We use the normal store IC mechanism with the global
object as the receiver.  The following code is generated for 'x=true'
at toplevel.

======== IA32:

27  mov eax,0xf5d06161          ;; object: 0xf5d06161 <true>
32  mov ecx,0xf5d09c35          ;; object: 0xf5d09c35 <String[1]: x>
37  push [esi+0x17]
40  call StoreIC_Initialize  (0xf5ce75c0)    ;; code: STORE_IC, UNINITIALIZED
45  mov [esp],eax

======== X64:

25  movq rax,0x7f867a7b6199    ;; object: 0x7f867a7b6199 <true>
35  movq rcx,0x7f867a7bae71    ;; object: 0x7f867a7bae71 <String[1]: x>
45  push [rsi+0x2f]
49  call StoreIC_Initialize  (0x7f8655929ac0)    ;; code: STORE_IC, UNINITIALIZED
54  movq [rsp],rax

======== ARM:

32  e59f0054       ldr r0, [pc, #+84]          ;; object: 0xf5b78161 <true>
36  e59f2054       ldr r2, [pc, #+84]          ;; object: 0xf5b7bc35 <String[1]: x>
40  e598c017       ldr ip, [r8, #+23]
44  e52dc004       str ip, [sp, #-4]!
48  e1a0e00f       mov lr, pc
52  e59ff048       ldr pc, [pc, #+72]          ;; debug: statement 0
                                               ;; code: STORE_IC, UNINITIALIZED
56  e58d0000       str r0, [sp, #+0]

Review URL: http://codereview.chromium.org/305005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3095 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
kmillikin@chromium.org 2009-10-20 13:37:26 +00:00
parent a637f45385
commit 4dfd44479d
9 changed files with 195 additions and 68 deletions
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5
src/arm/codegen-arm.h
View File

@ -242,7 +242,7 @@ class CodeGenerator: public AstVisitor {
void LoadReference(Reference* ref);
void UnloadReference(Reference* ref);
MemOperand ContextOperand(Register context, int index) const {
static MemOperand ContextOperand(Register context, int index) {
return MemOperand(context, Context::SlotOffset(index));
}
@ -254,7 +254,7 @@ class CodeGenerator: public AstVisitor {
JumpTarget* slow);
// Expressions
MemOperand GlobalObject() const {
static MemOperand GlobalObject() {
return ContextOperand(cp, Context::GLOBAL_INDEX);
}
@ -425,6 +425,7 @@ class CodeGenerator: public AstVisitor {
friend class VirtualFrame;
friend class JumpTarget;
friend class Reference;
friend class FastCodeGenerator;
DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
};

63
src/arm/fast-codegen-arm.cc
View File

@ -160,9 +160,10 @@ void FastCodeGenerator::VisitAssignment(Assignment* expr) {
Expression* rhs = expr->value();
Visit(rhs);
// Left-hand side is always a (parameter or local) slot.
// Left-hand side can only be a global or a (parameter or local) slot.
Variable* var = expr->target()->AsVariableProxy()->AsVariable();
ASSERT(var != NULL && var->slot() != NULL);
ASSERT(var != NULL);
ASSERT(var->is_global() || var->slot() != NULL);
// Complete the assignment based on the location of the right-hand-side
// value and the desired location of the assignment value.
@ -171,27 +172,53 @@ void FastCodeGenerator::VisitAssignment(Assignment* expr) {
ASSERT(!destination.is_constant());
ASSERT(!source.is_nowhere());
if (source.is_temporary()) {
if (var->is_global()) {
// Assignment to a global variable, use inline caching. Right-hand-side
// value is passed in r0, variable name in r2, and the global object on
// the stack.
if (source.is_temporary()) {
__ pop(r0);
} else {
ASSERT(source.is_constant());
ASSERT(rhs->AsLiteral() != NULL);
__ mov(r0, Operand(rhs->AsLiteral()->handle()));
}
__ mov(r2, Operand(var->name()));
__ ldr(ip, CodeGenerator::GlobalObject());
__ push(ip);
Handle<Code> ic(Builtins::builtin(Builtins::StoreIC_Initialize));
__ Call(ic, RelocInfo::CODE_TARGET);
// Overwrite the global object on the stack with the result if needed.
if (destination.is_temporary()) {
// Case 'temp1 <- (var = temp0)'. Preserve right-hand-side temporary
// on the stack.
__ ldr(ip, MemOperand(sp));
__ str(r0, MemOperand(sp));
} else {
ASSERT(destination.is_nowhere());
// Case 'var = temp'. Discard right-hand-side temporary.
__ pop(ip);
__ pop();
}
__ str(ip, MemOperand(fp, SlotOffset(var->slot())));
} else {
ASSERT(source.is_constant());
ASSERT(rhs->AsLiteral() != NULL);
// Two cases: 'temp <- (var = constant)', or 'var = constant' with a
// discarded result. Always perform the assignment.
__ mov(ip, Operand(rhs->AsLiteral()->handle()));
__ str(ip, MemOperand(fp, SlotOffset(var->slot())));
if (destination.is_temporary()) {
// Case 'temp <- (var = constant)'. Save result.
__ push(ip);
if (source.is_temporary()) {
if (destination.is_temporary()) {
// Case 'temp1 <- (var = temp0)'. Preserve right-hand-side
// temporary on the stack.
__ ldr(ip, MemOperand(sp));
} else {
ASSERT(destination.is_nowhere());
// Case 'var = temp'. Discard right-hand-side temporary.
__ pop(ip);
}
__ str(ip, MemOperand(fp, SlotOffset(var->slot())));
} else {
ASSERT(source.is_constant());
ASSERT(rhs->AsLiteral() != NULL);
// Two cases: 'temp <- (var = constant)', or 'var = constant' with a
// discarded result. Always perform the assignment.
__ mov(ip, Operand(rhs->AsLiteral()->handle()));
__ str(ip, MemOperand(fp, SlotOffset(var->slot())));
if (destination.is_temporary()) {
// Case 'temp <- (var = constant)'. Save result.
__ push(ip);
}
}
}
}

2
src/arm/virtual-frame-arm.cc
View File

@ -255,7 +255,7 @@ void VirtualFrame::InvokeBuiltin(Builtins::JavaScript id,
void VirtualFrame::RawCallCodeObject(Handle<Code> code,
RelocInfo::Mode rmode) {
RelocInfo::Mode rmode) {
ASSERT(cgen()->HasValidEntryRegisters());
__ Call(code, rmode);
}

12
src/compiler.cc
View File

@ -649,12 +649,14 @@ void CodeGenSelector::VisitAssignment(Assignment* expr) {
}
Variable* var = expr->target()->AsVariableProxy()->AsVariable();
if (var == NULL || var->is_global()) BAILOUT("non-variable assignment");
if (var == NULL) BAILOUT("non-variable assignment");
ASSERT(var->slot() != NULL);
Slot::Type type = var->slot()->type();
if (type != Slot::PARAMETER && type != Slot::LOCAL) {
BAILOUT("non-parameter/non-local slot assignment");
if (!var->is_global()) {
ASSERT(var->slot() != NULL);
Slot::Type type = var->slot()->type();
if (type != Slot::PARAMETER && type != Slot::LOCAL) {
BAILOUT("non-parameter/non-local slot assignment");
}
}
Visit(expr->value());

5
src/ia32/codegen-ia32.h
View File

@ -396,7 +396,7 @@ class CodeGenerator: public AstVisitor {
void LoadReference(Reference* ref);
void UnloadReference(Reference* ref);
Operand ContextOperand(Register context, int index) const {
static Operand ContextOperand(Register context, int index) {
return Operand(context, Context::SlotOffset(index));
}
@ -407,7 +407,7 @@ class CodeGenerator: public AstVisitor {
JumpTarget* slow);
// Expressions
Operand GlobalObject() const {
static Operand GlobalObject() {
return ContextOperand(esi, Context::GLOBAL_INDEX);
}
@ -616,6 +616,7 @@ class CodeGenerator: public AstVisitor {
friend class JumpTarget;
friend class Reference;
friend class Result;
friend class FastCodeGenerator;
friend class CodeGeneratorPatcher; // Used in test-log-stack-tracer.cc

63
src/ia32/fast-codegen-ia32.cc
View File

@ -149,9 +149,10 @@ void FastCodeGenerator::VisitAssignment(Assignment* expr) {
Expression* rhs = expr->value();
Visit(rhs);
// Left-hand side is always a (parameter or local) slot.
// Left-hand side can only be a global or a (parameter or local) slot.
Variable* var = expr->target()->AsVariableProxy()->AsVariable();
ASSERT(var != NULL && var->slot() != NULL);
ASSERT(var != NULL);
ASSERT(var->is_global() || var->slot() != NULL);
// Complete the assignment based on the location of the right-hand-side
// value and the desired location of the assignment value.
@ -160,27 +161,53 @@ void FastCodeGenerator::VisitAssignment(Assignment* expr) {
ASSERT(!destination.is_constant());
ASSERT(!source.is_nowhere());
if (source.is_temporary()) {
if (var->is_global()) {
// Assignment to a global variable, use inline caching. Right-hand-side
// value is passed in eax, variable name in ecx, and the global object
// on the stack.
if (source.is_temporary()) {
__ pop(eax);
} else {
ASSERT(source.is_constant());
ASSERT(rhs->AsLiteral() != NULL);
__ mov(eax, rhs->AsLiteral()->handle());
}
__ mov(ecx, var->name());
__ push(CodeGenerator::GlobalObject());
Handle<Code> ic(Builtins::builtin(Builtins::StoreIC_Initialize));
__ call(ic, RelocInfo::CODE_TARGET);
// Overwrite the global object on the stack with the result if needed.
if (destination.is_temporary()) {
// Case 'temp1 <- (var = temp0)'. Preserve right-hand-side temporary
// on the stack.
__ mov(eax, Operand(esp, 0));
__ mov(Operand(ebp, SlotOffset(var->slot())), eax);
__ mov(Operand(esp, 0), eax);
} else {
ASSERT(destination.is_nowhere());
// Case 'var = temp'. Discard right-hand-side temporary.
__ pop(Operand(ebp, SlotOffset(var->slot())));
__ pop(eax);
}
} else {
ASSERT(source.is_constant());
ASSERT(rhs->AsLiteral() != NULL);
// Two cases: 'temp <- (var = constant)', or 'var = constant' with a
// discarded result. Always perform the assignment.
__ mov(eax, rhs->AsLiteral()->handle());
__ mov(Operand(ebp, SlotOffset(var->slot())), eax);
if (destination.is_temporary()) {
// Case 'temp <- (var = constant)'. Save result.
__ push(eax);
// Local or parameter assignment.
if (source.is_temporary()) {
if (destination.is_temporary()) {
// Case 'temp1 <- (var = temp0)'. Preserve right-hand-side
// temporary on the stack.
__ mov(eax, Operand(esp, 0));
__ mov(Operand(ebp, SlotOffset(var->slot())), eax);
} else {
ASSERT(destination.is_nowhere());
// Case 'var = temp'. Discard right-hand-side temporary.
__ pop(Operand(ebp, SlotOffset(var->slot())));
}
} else {
ASSERT(source.is_constant());
ASSERT(rhs->AsLiteral() != NULL);
// Two cases: 'temp <- (var = constant)', or 'var = constant' with a
// discarded result. Always perform the assignment.
__ mov(eax, rhs->AsLiteral()->handle());
__ mov(Operand(ebp, SlotOffset(var->slot())), eax);
if (destination.is_temporary()) {
// Case 'temp <- (var = constant)'. Save result.
__ push(eax);
}
}
}
}

5
src/x64/codegen-x64.h
View File

@ -398,7 +398,7 @@ class CodeGenerator: public AstVisitor {
void LoadReference(Reference* ref);
void UnloadReference(Reference* ref);
Operand ContextOperand(Register context, int index) const {
static Operand ContextOperand(Register context, int index) {
return Operand(context, Context::SlotOffset(index));
}
@ -409,7 +409,7 @@ class CodeGenerator: public AstVisitor {
JumpTarget* slow);
// Expressions
Operand GlobalObject() const {
static Operand GlobalObject() {
return ContextOperand(rsi, Context::GLOBAL_INDEX);
}
@ -616,6 +616,7 @@ class CodeGenerator: public AstVisitor {
friend class JumpTarget;
friend class Reference;
friend class Result;
friend class FastCodeGenerator;
friend class CodeGeneratorPatcher; // Used in test-log-stack-tracer.cc

64
src/x64/fast-codegen-x64.cc
View File

@ -166,9 +166,10 @@ void FastCodeGenerator::VisitAssignment(Assignment* expr) {
Expression* rhs = expr->value();
Visit(rhs);
// Left-hand side is always a (parameter or local) slot.
// Left-hand side can only be a global or a (parameter or local) slot.
Variable* var = expr->target()->AsVariableProxy()->AsVariable();
ASSERT(var != NULL && var->slot() != NULL);
ASSERT(var != NULL);
ASSERT(var->is_global() || var->slot() != NULL);
// Complete the assignment based on the location of the right-hand-side
// value and the desired location of the assignment value.
@ -177,27 +178,50 @@ void FastCodeGenerator::VisitAssignment(Assignment* expr) {
ASSERT(!destination.is_constant());
ASSERT(!source.is_nowhere());
if (source.is_temporary()) {
if (destination.is_temporary()) {
// Case 'temp1 <- (var = temp0)'. Preserve right-hand-side temporary
// on the stack.
__ movq(kScratchRegister, Operand(rsp, 0));
__ movq(Operand(rbp, SlotOffset(var->slot())), kScratchRegister);
if (var->is_global()) {
// Assignment to a global variable, use inline caching. Right-hand-side
// value is passed in rax, variable name in rcx, and the global object
// on the stack.
if (source.is_temporary()) {
__ pop(rax);
} else {
ASSERT(destination.is_nowhere());
// Case 'var = temp'. Discard right-hand-side temporary.
__ pop(Operand(rbp, SlotOffset(var->slot())));
ASSERT(source.is_constant());
ASSERT(rhs->AsLiteral() != NULL);
__ Move(rax, rhs->AsLiteral()->handle());
}
__ Move(rcx, var->name());
__ push(CodeGenerator::GlobalObject());
Handle<Code> ic(Builtins::builtin(Builtins::StoreIC_Initialize));
__ Call(ic, RelocInfo::CODE_TARGET);
// Overwrite the global object on the stack with the result if needed.
if (destination.is_temporary()) {
__ movq(Operand(rsp, 0), rax);
} else {
__ pop(rax);
}
} else {
ASSERT(source.is_constant());
ASSERT(rhs->AsLiteral() != NULL);
// Two cases: 'temp <- (var = constant)', or 'var = constant' with a
// discarded result. Always perform the assignment.
__ Move(kScratchRegister, rhs->AsLiteral()->handle());
__ movq(Operand(rbp, SlotOffset(var->slot())), kScratchRegister);
if (destination.is_temporary()) {
// Case 'temp <- (var = constant)'. Save result.
__ push(kScratchRegister);
if (source.is_temporary()) {
if (destination.is_temporary()) {
// Case 'temp1 <- (var = temp0)'. Preserve right-hand-side temporary
// on the stack.
__ movq(kScratchRegister, Operand(rsp, 0));
__ movq(Operand(rbp, SlotOffset(var->slot())), kScratchRegister);
} else {
ASSERT(destination.is_nowhere());
// Case 'var = temp'. Discard right-hand-side temporary.
__ pop(Operand(rbp, SlotOffset(var->slot())));
}
} else {
ASSERT(source.is_constant());
ASSERT(rhs->AsLiteral() != NULL);
// Two cases: 'temp <- (var = constant)', or 'var = constant' with a
// discarded result. Always perform the assignment.
__ Move(kScratchRegister, rhs->AsLiteral()->handle());
__ movq(Operand(rbp, SlotOffset(var->slot())), kScratchRegister);
if (destination.is_temporary()) {
// Case 'temp <- (var = constant)'. Save result.
__ push(kScratchRegister);
}
}
}
}

44
test/mjsunit/compiler/globals.js Normal file
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@ -0,0 +1,44 @@
// Copyright 2009 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:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Test references and assignments to global variables.
var g = 0;
// Test compilation of a global variable store.
assertEquals(1, eval('g = 1'));
// Test that the store worked.
assertEquals(1, g);
// Test that patching the IC in the compiled code works.
assertEquals(1, eval('g = 1'));
assertEquals(1, g);
assertEquals(1, eval('g = 1'));
assertEquals(1, g);
// Test a second store.
assertEquals("2", eval('g = "2"'));
assertEquals("2", g);