kmillikin@google.com
41e77a0a9e
Visit the AST and generate an instruction (ie, not basic-block) flow
graph.
The flow graph for the simple function:
main() {
var f = 1;
var n = 5;
while (n > 0) {
f = f * n;
n = n - 1;
}
print(f);
}
is:
1: StoreLocal(f, #1)
2: StoreLocal(n, #5)
3: [join]
4: t0 <-LoadLocal(n)
5: t0 <-InstanceCall(>, t0, #0)
6: if t0 goto(7, 15)
7: [target]
8: t0 <-LoadLocal(f)
9: t1 <-LoadLocal(n)
10: t0 <-InstanceCall(*, t0, t1)
11: StoreLocal(f, t0)
12: t0 <-LoadLocal(n)
13: t0 <-InstanceCall(-, t0, #1)
14: StoreLocal(n, t0) goto 3
15: [target]
16: t0 <-LoadLocal(f)
17: StaticCall(print, t0)
18: return #null
BUG=
TEST=
Review URL: https://chromiumcodereview.appspot.com//9414003
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@4460 260f80e4-7a28-3924-810f-c04153c831b5
53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
// Copyright (c) 2012, 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_IA32.
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#if defined(TARGET_ARCH_IA32)
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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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bool InstructionPattern::TestBytesWith(const int* data, int num_bytes) const {
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ASSERT(data != NULL);
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const uint8_t* byte_array = reinterpret_cast<const uint8_t*>(start_);
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for (int i = 0; i < num_bytes; i++) {
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// Skip comparison for data[i] < 0.
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if ((data[i] >= 0) && (byte_array[i] != (0xFF & data[i]))) {
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return false;
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}
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}
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return true;
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}
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uword CallOrJumpPattern::TargetAddress() const {
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ASSERT(IsValid());
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return start() + kLengthInBytes + *reinterpret_cast<uword*>(start() + 1);
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}
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void CallOrJumpPattern::SetTargetAddress(uword target) const {
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ASSERT(IsValid());
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*reinterpret_cast<uword*>(start() + 1) = target - start() - kLengthInBytes;
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}
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const int* CallPattern::pattern() const {
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static const int kCallPattern[kLengthInBytes] = {0xE8, -1, -1, -1, -1};
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return kCallPattern;
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}
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const int* JumpPattern::pattern() const {
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static const int kJumpPattern[kLengthInBytes] = {0xE9, -1, -1, -1, -1};
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return kJumpPattern;
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_IA32
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