Delay emitting CFI PC adjustments until after Thumb2/Mips fixup.
On Mips also take into account out-of-order CFI data emitted
from EmitBranches().
Change-Id: I03b0b0b4c2b1ea31a02699ef5fa1c55aa42c23c3
diff --git a/compiler/utils/arm/assembler_thumb2.cc b/compiler/utils/arm/assembler_thumb2.cc
index fb3aa1e..297cc54 100644
--- a/compiler/utils/arm/assembler_thumb2.cc
+++ b/compiler/utils/arm/assembler_thumb2.cc
@@ -282,6 +282,32 @@
}
}
+void Thumb2Assembler::PatchCFI() {
+ if (cfi().NumberOfDelayedAdvancePCs() == 0u) {
+ return;
+ }
+
+ typedef DebugFrameOpCodeWriterForAssembler::DelayedAdvancePC DelayedAdvancePC;
+ const auto data = cfi().ReleaseStreamAndPrepareForDelayedAdvancePC();
+ const std::vector<uint8_t>& old_stream = data.first;
+ const std::vector<DelayedAdvancePC>& advances = data.second;
+
+ // Refill our data buffer with patched opcodes.
+ cfi().ReserveCFIStream(old_stream.size() + advances.size() + 16);
+ size_t stream_pos = 0;
+ for (const DelayedAdvancePC& advance : advances) {
+ DCHECK_GE(advance.stream_pos, stream_pos);
+ // Copy old data up to the point where advance was issued.
+ cfi().AppendRawData(old_stream, stream_pos, advance.stream_pos);
+ stream_pos = advance.stream_pos;
+ // Insert the advance command with its final offset.
+ size_t final_pc = GetAdjustedPosition(advance.pc);
+ cfi().AdvancePC(final_pc);
+ }
+ // Copy the final segment if any.
+ cfi().AppendRawData(old_stream, stream_pos, old_stream.size());
+}
+
inline int16_t Thumb2Assembler::BEncoding16(int32_t offset, Condition cond) {
DCHECK_ALIGNED(offset, 2);
int16_t encoding = B15 | B14;
@@ -463,6 +489,7 @@
EmitLiterals();
FinalizeTrackedLabels();
EmitJumpTables();
+ PatchCFI();
}
bool Thumb2Assembler::ShifterOperandCanAlwaysHold(uint32_t immediate) {