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-rw-r--r--js/src/jit/BaselineCompiler.cpp30
-rw-r--r--js/src/jit/BaselineCompiler.h1
-rw-r--r--js/src/jit/IonBuilder.cpp5
-rw-r--r--js/src/jit/MIRGraph.cpp13
-rw-r--r--js/src/jit/MIRGraph.h3
5 files changed, 51 insertions, 1 deletions
diff --git a/js/src/jit/BaselineCompiler.cpp b/js/src/jit/BaselineCompiler.cpp
index 4dcc10b61..2f0d41707 100644
--- a/js/src/jit/BaselineCompiler.cpp
+++ b/js/src/jit/BaselineCompiler.cpp
@@ -1147,7 +1147,7 @@ BaselineCompiler::emit_JSOP_PICK()
// after : A B D E C
// First, move value at -(amount + 1) into R0.
- int depth = -(GET_INT8(pc) + 1);
+ int32_t depth = -(GET_INT8(pc) + 1);
masm.loadValue(frame.addressOfStackValue(frame.peek(depth)), R0);
// Move the other values down.
@@ -1166,6 +1166,34 @@ BaselineCompiler::emit_JSOP_PICK()
}
bool
+BaselineCompiler::emit_JSOP_UNPICK()
+{
+ frame.syncStack(0);
+
+ // Pick takes the top of the stack value and moves it under the nth value.
+ // For instance, unpick 2:
+ // before: A B C D E
+ // after : A B E C D
+
+ // First, move value at -1 into R0.
+ masm.loadValue(frame.addressOfStackValue(frame.peek(-1)), R0);
+
+ // Move the other values up.
+ int32_t depth = -(GET_INT8(pc) + 1);
+ for (int32_t i = -1; i > depth; i--) {
+ Address source = frame.addressOfStackValue(frame.peek(i - 1));
+ Address dest = frame.addressOfStackValue(frame.peek(i));
+ masm.loadValue(source, R1);
+ masm.storeValue(R1, dest);
+ }
+
+ // Store R0 under the nth value.
+ Address dest = frame.addressOfStackValue(frame.peek(depth));
+ masm.storeValue(R0, dest);
+ return true;
+}
+
+bool
BaselineCompiler::emit_JSOP_GOTO()
{
frame.syncStack(0);
diff --git a/js/src/jit/BaselineCompiler.h b/js/src/jit/BaselineCompiler.h
index 77f4dd005..60dac0966 100644
--- a/js/src/jit/BaselineCompiler.h
+++ b/js/src/jit/BaselineCompiler.h
@@ -42,6 +42,7 @@ namespace jit {
_(JSOP_DUP2) \
_(JSOP_SWAP) \
_(JSOP_PICK) \
+ _(JSOP_UNPICK) \
_(JSOP_GOTO) \
_(JSOP_IFEQ) \
_(JSOP_IFNE) \
diff --git a/js/src/jit/IonBuilder.cpp b/js/src/jit/IonBuilder.cpp
index 2e7784ff4..c4df415a4 100644
--- a/js/src/jit/IonBuilder.cpp
+++ b/js/src/jit/IonBuilder.cpp
@@ -1563,6 +1563,7 @@ IonBuilder::traverseBytecode()
case JSOP_DUP:
case JSOP_DUP2:
case JSOP_PICK:
+ case JSOP_UNPICK:
case JSOP_SWAP:
case JSOP_SETARG:
case JSOP_SETLOCAL:
@@ -2017,6 +2018,10 @@ IonBuilder::inspectOpcode(JSOp op)
current->pick(-GET_INT8(pc));
return true;
+ case JSOP_UNPICK:
+ current->unpick(-GET_INT8(pc));
+ return true;
+
case JSOP_GETALIASEDVAR:
return jsop_getaliasedvar(EnvironmentCoordinate(pc));
diff --git a/js/src/jit/MIRGraph.cpp b/js/src/jit/MIRGraph.cpp
index 3a363a5bf..d6e0fa8ff 100644
--- a/js/src/jit/MIRGraph.cpp
+++ b/js/src/jit/MIRGraph.cpp
@@ -790,6 +790,19 @@ MBasicBlock::pick(int32_t depth)
}
void
+MBasicBlock::unpick(int32_t depth)
+{
+ // unpick take the top of the stack element and move it under the depth-th
+ // element;
+ // unpick(-2):
+ // A B C D E
+ // A B C E D [ swapAt(-1) ]
+ // A B E C D [ swapAt(-2) ]
+ for (int32_t n = -1; n >= depth; n--)
+ swapAt(n);
+}
+
+void
MBasicBlock::swapAt(int32_t depth)
{
uint32_t lhsDepth = stackPosition_ + depth - 1;
diff --git a/js/src/jit/MIRGraph.h b/js/src/jit/MIRGraph.h
index b986218f4..705d70fa1 100644
--- a/js/src/jit/MIRGraph.h
+++ b/js/src/jit/MIRGraph.h
@@ -142,6 +142,9 @@ class MBasicBlock : public TempObject, public InlineListNode<MBasicBlock>
// Move the definition to the top of the stack.
void pick(int32_t depth);
+ // Move the top of the stack definition under the depth-th stack value.
+ void unpick(int32_t depth);
+
// Exchange 2 stack slots at the defined depth
void swapAt(int32_t depth);