Chromium Code Reviews
chromiumcodereview-hr@appspot.gserviceaccount.com (chromiumcodereview-hr) | Please choose your nickname with Settings | Help | Chromium Project | Gerrit Changes | Sign out
(197)

Unified Diff: runtime/vm/stack_frame_dbc.h

Issue 1858283002: Initial SIMDBC interpreter. (Closed) Base URL: git@github.com:dart-lang/sdk.git@master
Patch Set: Created 4 years, 8 months ago
Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.
Jump to:
View side-by-side diff with in-line comments
Download patch
« no previous file with comments | « runtime/vm/stack_frame.cc ('k') | runtime/vm/stub_code.h » ('j') | no next file with comments »
Expand Comments ('e') | Collapse Comments ('c') | Show Comments Hide Comments ('s')
Index: runtime/vm/stack_frame_dbc.h
diff --git a/runtime/vm/stack_frame_dbc.h b/runtime/vm/stack_frame_dbc.h
new file mode 100644
index 0000000000000000000000000000000000000000..a59a417ed883b3b341be303dba46731e3669c626
--- /dev/null
+++ b/runtime/vm/stack_frame_dbc.h
@@ -0,0 +1,85 @@
+// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#ifndef VM_STACK_FRAME_DBC_H_
+#define VM_STACK_FRAME_DBC_H_
+
+namespace dart {
+
+/* DBC Frame Layout
+
+IMPORTANT: On DBC stack is growing upwards which is different from all other
+architectures. This enables effecient addressing for locals via unsigned index.
+
+ | | <- TOS
+Callee frame | ... |
+ | saved FP | (FP of current frame)
+ | saved PC | (PC of current frame)
+ | code object |
+ | function object |
+ +--------------------+
+Current frame | ... T| <- SP of current frame
+ | ... T|
+ | first local T| <- FP of current frame
+ | caller's FP *|
+ | caller's PC *|
+ | code object T| (current frame's code object)
+ | function object T| (current frame's function object)
+ +--------------------+
+Caller frame | last parameter | <- SP of caller frame
+ | ... |
+
+ T against a slot indicates it needs to be traversed during GC.
+ * against a slot indicates that it can be traversed during GC
+ because it will look like a smi to the visitor.
+*/
+
+static const int kDartFrameFixedSize = 4; // Function, Code, PC, FP
+static const int kSavedPcSlotFromSp = 3;
+
+static const int kFirstObjectSlotFromFp = -4; // Used by GC to traverse stack.
+
+static const int kSavedCallerFpSlotFromFp = -1;
+static const int kSavedCallerPpSlotFromFp = kSavedCallerFpSlotFromFp;
+static const int kSavedCallerPcSlotFromFp = -2;
+static const int kCallerSpSlotFromFp = -kDartFrameFixedSize-1;
+static const int kPcMarkerSlotFromFp = -3;
+static const int kFunctionSlotFromFp = -4;
+
+// Note: These constants don't match actual DBC behavior. This is done because
+// setting kFirstLocalSlotFromFp to 0 breaks assumptions spread across the code.
+// Instead for the purposes of local variable allocation we pretend that DBC
+// behaves as other architectures (stack growing downwards) and later fix
+// these indices during code generation in the backend.
+static const int kParamEndSlotFromFp = 4; // One slot past last parameter.
+static const int kFirstLocalSlotFromFp = -1;
+
+
+DART_FORCE_INLINE static uword LocalVarAddress(uword fp, intptr_t index) {
+ ASSERT(index != 0);
+ if (index > 0) {
+ return fp - index * kWordSize;
+ } else {
+ return fp - (index + 1) * kWordSize;
+ }
+}
+
+DART_FORCE_INLINE static uword ParamAddress(uword fp, intptr_t reverse_index) {
+ return fp - (kDartFrameFixedSize + reverse_index) * kWordSize;
+}
+
+DART_FORCE_INLINE static bool IsCalleeFrameOf(uword fp, uword other_fp) {
+ return other_fp > fp;
+}
+
+static const int kExitLinkSlotFromEntryFp = 0;
+
+// Value for stack limit that is used to cause an interrupt.
+// Note that on DBC stack is growing upwards so interrupt limit is 0 unlike
+// on all other architectures.
+static const uword kInterruptStackLimit = 0;
+
+} // namespace dart
+
+#endif // VM_STACK_FRAME_DBC_H_
« no previous file with comments | « runtime/vm/stack_frame.cc ('k') | runtime/vm/stub_code.h » ('j') | no next file with comments »

Powered by Google App Engine
This is Rietveld 408576698