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1 // Copyright 2009 the V8 project authors. All rights reserved. | 1 // Copyright 2009 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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189 ASSERT(loop_depth() == 0); | 189 ASSERT(loop_depth() == 0); |
190 VisitStatements(function()->body()); | 190 VisitStatements(function()->body()); |
191 ASSERT(loop_depth() == 0); | 191 ASSERT(loop_depth() == 0); |
192 } | 192 } |
193 | 193 |
194 { Comment cmnt(masm_, "[ return <undefined>;"); | 194 { Comment cmnt(masm_, "[ return <undefined>;"); |
195 // Emit a 'return undefined' in case control fell off the end of the | 195 // Emit a 'return undefined' in case control fell off the end of the |
196 // body. | 196 // body. |
197 __ LoadRoot(r0, Heap::kUndefinedValueRootIndex); | 197 __ LoadRoot(r0, Heap::kUndefinedValueRootIndex); |
198 } | 198 } |
199 EmitReturnSequence(function()->end_position()); | 199 EmitReturnSequence(); |
200 } | 200 } |
201 | 201 |
202 | 202 |
203 void FullCodeGenerator::EmitReturnSequence(int position) { | 203 void FullCodeGenerator::EmitReturnSequence() { |
204 Comment cmnt(masm_, "[ Return sequence"); | 204 Comment cmnt(masm_, "[ Return sequence"); |
205 if (return_label_.is_bound()) { | 205 if (return_label_.is_bound()) { |
206 __ b(&return_label_); | 206 __ b(&return_label_); |
207 } else { | 207 } else { |
208 __ bind(&return_label_); | 208 __ bind(&return_label_); |
209 if (FLAG_trace) { | 209 if (FLAG_trace) { |
210 // Push the return value on the stack as the parameter. | 210 // Push the return value on the stack as the parameter. |
211 // Runtime::TraceExit returns its parameter in r0. | 211 // Runtime::TraceExit returns its parameter in r0. |
212 __ push(r0); | 212 __ push(r0); |
213 __ CallRuntime(Runtime::kTraceExit, 1); | 213 __ CallRuntime(Runtime::kTraceExit, 1); |
214 } | 214 } |
215 | 215 |
216 #ifdef DEBUG | 216 #ifdef DEBUG |
217 // Add a label for checking the size of the code used for returning. | 217 // Add a label for checking the size of the code used for returning. |
218 Label check_exit_codesize; | 218 Label check_exit_codesize; |
219 masm_->bind(&check_exit_codesize); | 219 masm_->bind(&check_exit_codesize); |
220 #endif | 220 #endif |
221 // Make sure that the constant pool is not emitted inside of the return | 221 // Make sure that the constant pool is not emitted inside of the return |
222 // sequence. | 222 // sequence. |
223 { Assembler::BlockConstPoolScope block_const_pool(masm_); | 223 { Assembler::BlockConstPoolScope block_const_pool(masm_); |
224 // Here we use masm_-> instead of the __ macro to avoid the code coverage | 224 // Here we use masm_-> instead of the __ macro to avoid the code coverage |
225 // tool from instrumenting as we rely on the code size here. | 225 // tool from instrumenting as we rely on the code size here. |
226 int32_t sp_delta = (scope()->num_parameters() + 1) * kPointerSize; | 226 int32_t sp_delta = (scope()->num_parameters() + 1) * kPointerSize; |
227 CodeGenerator::RecordPositions(masm_, position); | 227 CodeGenerator::RecordPositions(masm_, function()->end_position()); |
228 __ RecordJSReturn(); | 228 __ RecordJSReturn(); |
229 masm_->mov(sp, fp); | 229 masm_->mov(sp, fp); |
230 masm_->ldm(ia_w, sp, fp.bit() | lr.bit()); | 230 masm_->ldm(ia_w, sp, fp.bit() | lr.bit()); |
231 masm_->add(sp, sp, Operand(sp_delta)); | 231 masm_->add(sp, sp, Operand(sp_delta)); |
232 masm_->Jump(lr); | 232 masm_->Jump(lr); |
233 } | 233 } |
234 | 234 |
235 #ifdef DEBUG | 235 #ifdef DEBUG |
236 // Check that the size of the code used for returning matches what is | 236 // Check that the size of the code used for returning matches what is |
237 // expected by the debugger. If the sp_delts above cannot be encoded in the | 237 // expected by the debugger. If the sp_delts above cannot be encoded in the |
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3135 __ mov(r1, Operand(r1, ASR, 1)); // Un-smi-tag value. | 3135 __ mov(r1, Operand(r1, ASR, 1)); // Un-smi-tag value. |
3136 __ add(pc, r1, Operand(masm_->CodeObject())); | 3136 __ add(pc, r1, Operand(masm_->CodeObject())); |
3137 } | 3137 } |
3138 | 3138 |
3139 | 3139 |
3140 #undef __ | 3140 #undef __ |
3141 | 3141 |
3142 } } // namespace v8::internal | 3142 } } // namespace v8::internal |
3143 | 3143 |
3144 #endif // V8_TARGET_ARCH_ARM | 3144 #endif // V8_TARGET_ARCH_ARM |
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