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// 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.
#include "v8.h"
#include "codegen-inl.h"
#include "fast-codegen.h"
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm_)
// Generate code for a JS function. On entry to the function the receiver
// and arguments have been pushed on the stack left to right, with the
// return address on top of them. The actual argument count matches the
// formal parameter count expected by the function.
//
// The live registers are:
// o edi: the JS function object being called (ie, ourselves)
// o esi: our context
// o ebp: our caller's frame pointer
// o esp: stack pointer (pointing to return address)
//
// The function builds a JS frame. Please see JavaScriptFrameConstants in
// frames-ia32.h for its layout.
void FastCodeGenerator::Generate(FunctionLiteral* fun) {
function_ = fun;
SetFunctionPosition(fun);
__ push(ebp); // Caller's frame pointer.
__ mov(ebp, esp);
__ push(esi); // Callee's context.
__ push(edi); // Callee's JS Function.
{ Comment cmnt(masm_, "[ Allocate locals");
int locals_count = fun->scope()->num_stack_slots();
for (int i = 0; i < locals_count; i++) {
__ push(Immediate(Factory::undefined_value()));
}
}
{ Comment cmnt(masm_, "[ Stack check");
Label ok;
ExternalReference stack_guard_limit =
ExternalReference::address_of_stack_guard_limit();
__ cmp(esp, Operand::StaticVariable(stack_guard_limit));
__ j(above_equal, &ok, taken);
StackCheckStub stub;
__ CallStub(&stub);
__ bind(&ok);
}
{ Comment cmnt(masm_, "[ Body");
VisitStatements(fun->body());
}
{ Comment cmnt(masm_, "[ return <undefined>;");
// Emit a 'return undefined' in case control fell off the end of the
// body.
__ mov(eax, Factory::undefined_value());
SetReturnPosition(fun);
__ RecordJSReturn();
// Do not use the leave instruction here because it is too short to
// patch with the code required by the debugger.
__ mov(esp, ebp);
__ pop(ebp);
__ ret((fun->scope()->num_parameters() + 1) * kPointerSize);
}
}
void FastCodeGenerator::VisitExpressionStatement(ExpressionStatement* stmt) {
Comment cmnt(masm_, "[ ExpressionStatement");
SetStatementPosition(stmt);
Visit(stmt->expression());
}
void FastCodeGenerator::VisitReturnStatement(ReturnStatement* stmt) {
Comment cmnt(masm_, "[ ReturnStatement");
SetStatementPosition(stmt);
Visit(stmt->expression());
__ pop(eax);
__ RecordJSReturn();
// Do not use the leave instruction here because it is too short to
// patch with the code required by the debugger.
__ mov(esp, ebp);
__ pop(ebp);
__ ret((function_->scope()->num_parameters() + 1) * kPointerSize);
}
void FastCodeGenerator::VisitVariableProxy(VariableProxy* expr) {
Comment cmnt(masm_, "[ VariableProxy");
Expression* rewrite = expr->var()->rewrite();
ASSERT(rewrite != NULL);
Slot* slot = rewrite->AsSlot();
ASSERT(slot != NULL);
{ Comment cmnt(masm_, "[ Slot");
if (expr->location().is_temporary()) {
__ push(Operand(ebp, SlotOffset(slot)));
} else {
ASSERT(expr->location().is_nowhere());
}
}
}
void FastCodeGenerator::VisitLiteral(Literal* expr) {
Comment cmnt(masm_, "[ Literal");
if (expr->location().is_temporary()) {
__ push(Immediate(expr->handle()));
} else {
ASSERT(expr->location().is_nowhere());
}
}
void FastCodeGenerator::VisitAssignment(Assignment* expr) {
Comment cmnt(masm_, "[ Assignment");
ASSERT(expr->op() == Token::ASSIGN || expr->op() == Token::INIT_VAR);
Visit(expr->value());
Variable* var = expr->target()->AsVariableProxy()->AsVariable();
ASSERT(var != NULL && var->slot() != NULL);
if (expr->location().is_temporary()) {
__ mov(eax, Operand(esp, 0));
__ mov(Operand(ebp, SlotOffset(var->slot())), eax);
} else {
ASSERT(expr->location().is_nowhere());
__ pop(Operand(ebp, SlotOffset(var->slot())));
}
}
} } // namespace v8::internal
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