Revision: 12188
Author: [email protected]
Date: Wed Jul 25 07:36:38 2012
Log: MIPS: Implements a new API to set a function entry hook for
profiling.
Port r12107 (59ee5c88)
Original commit message:
Exposes a new API; V8::SetFunctionEntryHook.
If a non-NULL function entry hook is set, the code generator(s) will invoke
on the entry hook at the very start of each generated function.
Committed: https://code.google.com/p/v8/source/detail?r=12069
Committed: https://code.google.com/p/v8/source/detail?r=12083
BUG=
TEST=
Review URL: https://chromiumcodereview.appspot.com/10795021
Patch from Akos Palfi <[email protected]>.
http://code.google.com/p/v8/source/detail?r=12188
Modified:
/branches/bleeding_edge/src/mips/code-stubs-mips.cc
/branches/bleeding_edge/src/mips/full-codegen-mips.cc
/branches/bleeding_edge/src/mips/lithium-codegen-mips.cc
=======================================
--- /branches/bleeding_edge/src/mips/code-stubs-mips.cc Wed Jul 18 06:50:19
2012
+++ /branches/bleeding_edge/src/mips/code-stubs-mips.cc Wed Jul 25 07:36:38
2012
@@ -7764,6 +7764,66 @@
__ Ret(USE_DELAY_SLOT);
__ mov(v0, a0);
}
+
+
+void ProfileEntryHookStub::MaybeCallEntryHook(MacroAssembler* masm) {
+ if (entry_hook_ != NULL) {
+ ProfileEntryHookStub stub;
+ __ push(ra);
+ __ CallStub(&stub);
+ __ pop(ra);
+ }
+}
+
+
+void ProfileEntryHookStub::Generate(MacroAssembler* masm) {
+ // The entry hook is a "push ra" instruction, followed by a call.
+ // Note: on MIPS "push" is 2 instruction
+ const int32_t kReturnAddressDistanceFromFunctionStart =
+ Assembler::kCallTargetAddressOffset + (2 * Assembler::kInstrSize);
+
+ // Save live volatile registers.
+ __ Push(ra, t1, a1);
+ const int32_t kNumSavedRegs = 3;
+
+ // Compute the function's address for the first argument.
+ __ Subu(a0, ra, Operand(kReturnAddressDistanceFromFunctionStart));
+
+ // The caller's return address is above the saved temporaries.
+ // Grab that for the second argument to the hook.
+ __ Addu(a1, sp, Operand(kNumSavedRegs * kPointerSize));
+
+ // Align the stack if necessary.
+ int frame_alignment = masm->ActivationFrameAlignment();
+ if (frame_alignment > kPointerSize) {
+ __ mov(t1, sp);
+ ASSERT(IsPowerOf2(frame_alignment));
+ __ And(sp, sp, Operand(-frame_alignment));
+ }
+
+#if defined(V8_HOST_ARCH_MIPS)
+ __ li(at, Operand(reinterpret_cast<int32_t>(&entry_hook_)));
+ __ lw(at, MemOperand(at));
+#else
+ // Under the simulator we need to indirect the entry hook through a
+ // trampoline function at a known address.
+ Address trampoline_address = reinterpret_cast<Address>(
+ reinterpret_cast<intptr_t>(EntryHookTrampoline));
+ ApiFunction dispatcher(trampoline_address);
+ __ li(at, Operand(ExternalReference(&dispatcher,
+ ExternalReference::BUILTIN_CALL,
+ masm->isolate())));
+#endif
+ __ Call(at);
+
+ // Restore the stack pointer if needed.
+ if (frame_alignment > kPointerSize) {
+ __ mov(sp, t1);
+ }
+
+ __ Pop(ra, t1, a1);
+ __ Ret();
+}
#undef __
=======================================
--- /branches/bleeding_edge/src/mips/full-codegen-mips.cc Wed Jul 25
07:27:14 2012
+++ /branches/bleeding_edge/src/mips/full-codegen-mips.cc Wed Jul 25
07:36:38 2012
@@ -143,6 +143,8 @@
SetFunctionPosition(function());
Comment cmnt(masm_, "[ function compiled by full code generator");
+ ProfileEntryHookStub::MaybeCallEntryHook(masm_);
+
#ifdef DEBUG
if (strlen(FLAG_stop_at) > 0 &&
info->function()->name()->IsEqualTo(CStrVector(FLAG_stop_at))) {
=======================================
--- /branches/bleeding_edge/src/mips/lithium-codegen-mips.cc Thu Jul 19
07:45:19 2012
+++ /branches/bleeding_edge/src/mips/lithium-codegen-mips.cc Wed Jul 25
07:36:38 2012
@@ -125,6 +125,8 @@
bool LCodeGen::GeneratePrologue() {
ASSERT(is_generating());
+ ProfileEntryHookStub::MaybeCallEntryHook(masm_);
+
#ifdef DEBUG
if (strlen(FLAG_stop_at) > 0 &&
info_->function()->name()->IsEqualTo(CStrVector(FLAG_stop_at))) {
--
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