[m-dev.] diff: bugfix for weird retry problem

[Zoltan Somogyi]

This has bootchecked in the both asm_fast.gc and asm_fast.gc.debug.tr grades.

Fix a bug where a retried of a shallow traced procedure assumed that it was
called from a shallow traced region (sourceforge #130038).

trace/mercury_trace.c:
	Set MR_trace_from_full to TRUE on retry.


Zoltan.

cvs diff: Diffing .
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Index: trace/mercury_trace.c
===================================================================
RCS file: /home/mercury1/repository/mercury/trace/mercury_trace.c,v
retrieving revision 1.37
diff -u -b -r1.37 mercury_trace.c
--- trace/mercury_trace.c	2001/01/18 01:19:14	1.37
+++ trace/mercury_trace.c	2001/02/01 23:46:51
@@ -656,6 +656,26 @@
 	MR_saved_curfr(saved_regs) = base_curfr;
 	MR_saved_maxfr(saved_regs) = base_maxfr;
 
+	/*
+	** If the retried call is shallow traced, it must have been called from
+	** a deep traced region, since otherwise we wouldn't have had
+	** sufficient information to retry it. Since the retry may have been
+	** executed from a deep traced procedure called from deep within
+	** a shallow traced region, MR_trace_from_full may now be FALSE.
+	** We therefore reset it to TRUE.
+	**
+	** The only case where this assignment does not faithfully recreate the
+	** situation that existed at the time the retried call was originally
+	** executed is when the retried call is deep traced but was called from
+	** inside a shallow traced region. However, this difference will not
+	** affect the behavior of either the called procedure (since deep
+	** traced procedures do not pay attention to the initial value of
+	** MR_trace_from_full) or its caller (since all callers expect that
+	** the callee may clobber MR_trace_from_full).
+	*/
+
+	MR_trace_from_full = TRUE;
+
 	if (MR_DETISM_DET_STACK(level_layout->MR_sle_detism)) {
 		MR_Long_Lval	location;
 		MR_Word		*this_frame;
cvs diff: Diffing trial
cvs diff: Diffing util
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