hausner@google.com
80c7ad1070
Introduce a new PcDescriptor kind to distinguish closure calls from other runtime calls. The debugger can patch these calls to set a breakpoint. When stepping into a closure call, the debugger must fish out the closure object from the stack, find the function and set breakpoints in it. Arm and Mips breakpoint stubs are not implemented yet. ia32 and x64 stubs tested by hand. Automated test to follow. R=srdjan@google.com Review URL: https://codereview.chromium.org//14858033 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@22596 260f80e4-7a28-3924-810f-c04153c831b5
75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/globals.h"
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#if defined(TARGET_ARCH_ARM)
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#include "vm/cpu.h"
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#include "vm/debugger.h"
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#include "vm/instructions.h"
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#include "vm/stub_code.h"
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namespace dart {
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// TODO(hausner): Handle captured variables.
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RawInstance* ActivationFrame::GetLocalVarValue(intptr_t slot_index) {
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uword var_address = fp() + slot_index * kWordSize;
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return reinterpret_cast<RawInstance*>(
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*reinterpret_cast<uword*>(var_address));
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}
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RawInstance* ActivationFrame::GetInstanceCallReceiver(
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intptr_t num_actual_args) {
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ASSERT(num_actual_args > 0); // At minimum we have a receiver on the stack.
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// Stack pointer points to last argument that was pushed on the stack.
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uword receiver_addr = sp() + ((num_actual_args - 1) * kWordSize);
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return reinterpret_cast<RawInstance*>(
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*reinterpret_cast<uword*>(receiver_addr));
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}
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RawObject* ActivationFrame::GetClosureObject(intptr_t num_actual_args) {
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// At a minimum we have the closure object on the stack.
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ASSERT(num_actual_args > 0);
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// Stack pointer points to last argument that was pushed on the stack.
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uword closure_addr = sp() + ((num_actual_args - 1) * kWordSize);
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return reinterpret_cast<RawObject*>(
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*reinterpret_cast<uword*>(closure_addr));
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}
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void CodeBreakpoint::PatchFunctionReturn() {
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uword* code = reinterpret_cast<uword*>(pc_ - 3 * Instr::kInstrSize);
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ASSERT(code[0] == 0xe8bd4c00); // ldmia sp!, {pp, fp, lr}
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ASSERT(code[1] == 0xe28dd004); // add sp, sp, #4
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ASSERT(code[2] == 0xe12fff1e); // bx lr
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// Smash code with call instruction and target address.
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uword stub_addr = StubCode::BreakpointReturnEntryPoint();
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uint16_t target_lo = stub_addr & 0xffff;
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uint16_t target_hi = stub_addr >> 16;
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uword movw = 0xe300c000 | ((target_lo >> 12) << 16) | (target_lo & 0xfff);
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uword movt = 0xe340c000 | ((target_hi >> 12) << 16) | (target_hi & 0xfff);
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uword blx = 0xe12fff3c;
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code[0] = movw; // movw ip, #target_lo
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code[1] = movt; // movt ip, #target_hi
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code[2] = blx; // blx ip
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CPU::FlushICache(pc_ - 3 * Instr::kInstrSize, 3 * Instr::kInstrSize);
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}
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void CodeBreakpoint::RestoreFunctionReturn() {
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uword* code = reinterpret_cast<uword*>(pc_ - 3 * Instr::kInstrSize);
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ASSERT((code[0] & 0xfff0f000) == 0xe300c000);
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code[0] = 0xe8bd4c00; // ldmia sp!, {pp, fp, lr}
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code[1] = 0xe28dd004; // add sp, sp, #4
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code[2] = 0xe12fff1e; // bx lr
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CPU::FlushICache(pc_ - 3 * Instr::kInstrSize, 3 * Instr::kInstrSize);
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_ARM
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