Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/runtime/StackFrameStream.java @ 7402:fd74228fd5ca
8004076: Move _max_locals and _size_of_parameters to ConstMethod for better sharing.
Summary: Move _max_locals and _size_of_parameters to ConstMethod for better sharing.
Reviewed-by: coleenp, minqi, jrose
author | jiangli |
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date | Tue, 11 Dec 2012 12:41:31 -0500 |
parents | c18cbe5936b8 |
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rev | line source |
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0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 package sun.jvm.hotspot.runtime; | |
26 | |
27 import sun.jvm.hotspot.utilities.*; | |
28 | |
29 /** <P> StackFrameStream iterates through the frames of a thread | |
30 starting from top most frame. It automatically takes care of | |
31 updating the location of all (callee-saved) registers. Notice: If | |
32 a thread is stopped at a safepoint, all registers are saved, not | |
33 only the callee-saved ones. </P> | |
34 | |
35 <P> Use: </P> | |
36 | |
37 <PRE> | |
38 for(StackFrameStream fst = new StackFrameStream(thread); !fst.isDone(); fst.next()) { | |
39 ... | |
40 } | |
41 </PRE> | |
42 */ | |
43 | |
44 public class StackFrameStream { | |
45 private Frame fr; | |
46 private RegisterMap regMap; | |
47 private boolean isDone; | |
48 | |
49 /** Equivalent to StackFrameStream(thread, true) */ | |
50 public StackFrameStream(JavaThread thread) { | |
51 this(thread, true); | |
52 } | |
53 | |
54 public StackFrameStream(JavaThread thread, boolean update) { | |
55 if (!VM.getVM().isDebugging()) { | |
56 if (Assert.ASSERTS_ENABLED) { | |
57 Assert.that(thread.hasLastJavaFrame(), "sanity check"); | |
58 } | |
59 fr = thread.getLastFrame(); | |
60 regMap = thread.newRegisterMap(update); | |
61 isDone = false; | |
62 } else { | |
63 // Special case code to find the topmost Java frame | |
64 // FIXME: should check to see whether we're at safepoint, and if | |
65 // so, skip the "current frame guess" call and unnecessary | |
66 // stackwalking work | |
67 fr = thread.getCurrentFrameGuess(); | |
68 regMap = thread.newRegisterMap(update); | |
69 while ((fr != null) && (!fr.isJavaFrame())) { | |
70 if (fr.isFirstFrame()) { | |
71 fr = null; | |
72 } else { | |
73 fr = fr.sender(regMap); | |
74 } | |
75 } | |
76 if (fr == null) { | |
77 isDone = true; | |
78 } | |
79 } | |
80 } | |
81 | |
82 /** Iteration */ | |
83 public boolean isDone() { | |
84 if (isDone) { | |
85 return true; | |
86 } else { | |
87 if (fr == null) { | |
88 isDone = true; | |
89 return true; | |
90 } | |
91 isDone = fr.isFirstFrame(); | |
92 return false; | |
93 } | |
94 } | |
95 | |
96 public void next() { | |
97 if (!isDone) { | |
98 fr = fr.sender(regMap); | |
99 } | |
100 } | |
101 | |
102 /** Query */ | |
103 public Frame getCurrent() { return fr; } | |
104 public RegisterMap getRegisterMap() { return regMap; } | |
105 } |