Florian Schneider
bac82e2592
Instead of calling code object directly, call indirectly and pass the code object in a register. The object pool is then loaded from the code object. This is another preparation step for making generated code relocatable. All non-ia32 platforms: No entry patching. ARM: PC marker (now code object) moves to the same place as on x64 (below saved PP, above saved FP). R9 is now used as PP, R10 as CODE_REG. BUG= R=koda@google.com, rmacnak@google.com Committed: https://github.com/dart-lang/sdk/commit/1d343e5a7b75168fb6c9f86b64c55173cdbdc9b2 Review URL: https://codereview.chromium.org//1192103004 .
136 lines
4.2 KiB
C++
136 lines
4.2 KiB
C++
// Copyright (c) 2013, 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" // Needed here to get TARGET_ARCH_MIPS.
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#if defined(TARGET_ARCH_MIPS)
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#include "vm/code_patcher.h"
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#include "vm/instructions.h"
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#include "vm/object.h"
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namespace dart {
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RawCode* CodePatcher::GetStaticCallTargetAt(uword return_address,
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const Code& code) {
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ASSERT(code.ContainsInstructionAt(return_address));
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CallPattern call(return_address, code);
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return call.TargetCode();
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}
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void CodePatcher::PatchStaticCallAt(uword return_address,
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const Code& code,
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const Code& new_target) {
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ASSERT(code.ContainsInstructionAt(return_address));
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CallPattern call(return_address, code);
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call.SetTargetCode(new_target);
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}
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void CodePatcher::InsertDeoptimizationCallAt(uword start, uword target) {
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// The inserted call should not overlap the lazy deopt jump code.
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ASSERT(start + CallPattern::kDeoptCallLengthInBytes <= target);
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CallPattern::InsertDeoptCallAt(start, target);
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}
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RawCode* CodePatcher::GetInstanceCallAt(uword return_address,
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const Code& code,
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ICData* ic_data) {
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ASSERT(code.ContainsInstructionAt(return_address));
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CallPattern call(return_address, code);
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if (ic_data != NULL) {
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*ic_data = call.IcData();
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}
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return call.TargetCode();
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}
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intptr_t CodePatcher::InstanceCallSizeInBytes() {
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// The instance call instruction sequence has a variable size on MIPS.
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UNREACHABLE();
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return 0;
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}
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RawFunction* CodePatcher::GetUnoptimizedStaticCallAt(
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uword return_address, const Code& code, ICData* ic_data_result) {
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ASSERT(code.ContainsInstructionAt(return_address));
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CallPattern static_call(return_address, code);
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ICData& ic_data = ICData::Handle();
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ic_data ^= static_call.IcData();
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if (ic_data_result != NULL) {
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*ic_data_result = ic_data.raw();
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}
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return ic_data.GetTargetAt(0);
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}
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void CodePatcher::PatchNativeCallAt(uword return_address,
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const Code& code,
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NativeFunction target,
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const Code& trampoline) {
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ASSERT(code.ContainsInstructionAt(return_address));
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NativeCallPattern call(return_address, code);
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call.set_target(trampoline);
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call.set_native_function(target);
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}
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RawCode* CodePatcher::GetNativeCallAt(uword return_address,
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const Code& code,
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NativeFunction* target) {
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ASSERT(code.ContainsInstructionAt(return_address));
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NativeCallPattern call(return_address, code);
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*target = call.native_function();
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return call.target();
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}
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// This class pattern matches on a load from the object pool. Loading on
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// MIPS is complicated because it can take four possible different forms.
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// We match backwards from the end of the sequence so we can reuse the code
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// for matching object pool loads at calls.
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class EdgeCounter : public ValueObject {
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public:
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EdgeCounter(uword pc, const Code& code)
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: end_(pc - kAdjust),
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object_pool_(ObjectPool::Handle(code.GetObjectPool())) {
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// An IsValid predicate is complicated and duplicates the code in the
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// decoding function. Instead we rely on decoding the pattern which
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// will assert partial validity.
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}
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RawObject* edge_counter() const {
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Register ignored;
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intptr_t index;
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InstructionPattern::DecodeLoadWordFromPool(end_, &ignored, &index);
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ASSERT(ignored == T0);
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return object_pool_.ObjectAt(index);
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}
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private:
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// The object pool load is followed by the fixed-size edge counter
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// incrementing code:
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// lw r9, 11(r8)
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// addiu r9, r9, 2
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// sw r9, 11(r8)
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static const intptr_t kAdjust = 3 * Instr::kInstrSize;
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uword end_;
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const ObjectPool& object_pool_;
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};
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RawObject* CodePatcher::GetEdgeCounterAt(uword pc, const Code& code) {
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ASSERT(code.ContainsInstructionAt(pc));
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EdgeCounter counter(pc, code);
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return counter.edge_counter();
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_MIPS
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