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| 1 // Copyright 2009 the V8 project authors. All rights reserved. |
| 2 // Redistribution and use in source and binary forms, with or without |
| 3 // modification, are permitted provided that the following conditions are |
| 4 // met: |
| 5 // |
| 6 // * Redistributions of source code must retain the above copyright |
| 7 // notice, this list of conditions and the following disclaimer. |
| 8 // * Redistributions in binary form must reproduce the above |
| 9 // copyright notice, this list of conditions and the following |
| 10 // disclaimer in the documentation and/or other materials provided |
| 11 // with the distribution. |
| 12 // * Neither the name of Google Inc. nor the names of its |
| 13 // contributors may be used to endorse or promote products derived |
| 14 // from this software without specific prior written permission. |
| 15 // |
| 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 |
| 28 #include "v8.h" |
| 29 |
| 30 #include "codegen-inl.h" |
| 31 #include "fast-codegen.h" |
| 32 // #include "scopes.h" |
| 33 |
| 34 namespace v8 { |
| 35 namespace internal { |
| 36 |
| 37 #define __ ACCESS_MASM(masm_) |
| 38 |
| 39 // Generate code for a JS function. On entry to the function the receiver |
| 40 // and arguments have been pushed on the stack left to right, with the |
| 41 // return address on top of them. The actual argument count matches the |
| 42 // formal parameter count expected by the function. |
| 43 // |
| 44 // The live registers are: |
| 45 // o edi: the JS function object being called (ie, ourselves) |
| 46 // o esi: our context |
| 47 // o ebp: our caller's frame pointer |
| 48 // |
| 49 // The function builds a JS frame. Please see JavaScriptFrameConstants in |
| 50 // frames-ia32.h for its layout. |
| 51 void FastCodeGenerator::Generate(FunctionLiteral* fun) { |
| 52 function_ = fun; |
| 53 |
| 54 __ push(ebp); // Caller's frame pointer. |
| 55 __ mov(ebp, esp); |
| 56 __ push(esi); // Callee's context. |
| 57 __ push(edi); // Callee's JS Function. |
| 58 |
| 59 { Comment cmnt(masm_, "[ Allocate locals"); |
| 60 int locals_count = fun->scope()->num_stack_slots(); |
| 61 for (int i = 0; i < locals_count; i++) { |
| 62 __ push(Immediate(Factory::undefined_value())); |
| 63 } |
| 64 } |
| 65 |
| 66 { Comment cmnt(masm_, "[ Stack check"); |
| 67 Label ok; |
| 68 ExternalReference stack_guard_limit = |
| 69 ExternalReference::address_of_stack_guard_limit(); |
| 70 __ cmp(esp, Operand::StaticVariable(stack_guard_limit)); |
| 71 __ j(above_equal, &ok, taken); |
| 72 StackCheckStub stub; |
| 73 __ CallStub(&stub); |
| 74 __ bind(&ok); |
| 75 } |
| 76 |
| 77 { Comment cmnt(masm_, "[ Body"); |
| 78 VisitStatements(fun->body()); |
| 79 } |
| 80 |
| 81 { Comment cmnt(masm_, "[ return <undefined>;"); |
| 82 // Emit a 'return undefined' in case control fell off the end of the |
| 83 // body. |
| 84 __ mov(eax, Factory::undefined_value()); |
| 85 __ RecordJSReturn(); |
| 86 // Do not use the leave instruction here because it is too short to |
| 87 // patch with the code required by the debugger. |
| 88 __ mov(esp, ebp); |
| 89 __ pop(ebp); |
| 90 __ ret((fun->scope()->num_parameters() + 1) * kPointerSize); |
| 91 } |
| 92 } |
| 93 |
| 94 |
| 95 void FastCodeGenerator::VisitExpressionStatement(ExpressionStatement* stmt) { |
| 96 Comment cmnt(masm_, "[ ExpressionStatement"); |
| 97 Visit(stmt->expression()); |
| 98 __ pop(eax); |
| 99 } |
| 100 |
| 101 |
| 102 void FastCodeGenerator::VisitReturnStatement(ReturnStatement* stmt) { |
| 103 Comment cmnt(masm_, "[ ReturnStatement"); |
| 104 Visit(stmt->expression()); |
| 105 __ pop(eax); |
| 106 __ RecordJSReturn(); |
| 107 // Do not use the leave instruction here because it is too short to |
| 108 // patch with the code required by the debugger. |
| 109 __ mov(esp, ebp); |
| 110 __ pop(ebp); |
| 111 __ ret((function_->scope()->num_parameters() + 1) * kPointerSize); |
| 112 } |
| 113 |
| 114 |
| 115 void FastCodeGenerator::VisitSlot(Slot* expr) { |
| 116 Comment cmnt(masm_, "[ Slot"); |
| 117 __ push(Operand(ebp, SlotOffset(expr))); |
| 118 } |
| 119 |
| 120 |
| 121 void FastCodeGenerator::VisitVariableProxy(VariableProxy* expr) { |
| 122 Comment cmnt(masm_, "[ VariableProxy"); |
| 123 Expression* rewrite = expr->var()->rewrite(); |
| 124 ASSERT(rewrite != NULL); |
| 125 Visit(rewrite); |
| 126 } |
| 127 |
| 128 |
| 129 void FastCodeGenerator::VisitLiteral(Literal* expr) { |
| 130 Comment cmnt(masm_, "[ Literal"); |
| 131 __ push(Immediate(expr->handle())); |
| 132 } |
| 133 |
| 134 |
| 135 void FastCodeGenerator::VisitAssignment(Assignment* expr) { |
| 136 Comment cmnt(masm_, "[ Assignment"); |
| 137 ASSERT(expr->op() == Token::ASSIGN || expr->op() == Token::INIT_VAR); |
| 138 |
| 139 Visit(expr->value()); |
| 140 |
| 141 Variable* var = expr->target()->AsVariableProxy()->AsVariable(); |
| 142 ASSERT(var != NULL && var->slot() != NULL); |
| 143 __ mov(eax, Operand(esp, 0)); |
| 144 __ mov(Operand(ebp, SlotOffset(var->slot())), eax); |
| 145 } |
| 146 |
| 147 |
| 148 } } // namespace v8::internal |
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