Keith Randall ef50373983 reflect: ensure correct scanning of return values ... During a call to a reflect-generated function or method (via makeFuncStub or methodValueCall), when should we scan the return values? When we're starting a reflect call, the space on the stack for the return values is not initialized yet, as it contains whatever junk was on the stack of the caller at the time. The return space must not be scanned during a GC. When we're finishing a reflect call, the return values are initialized, and must be scanned during a GC to make sure that any pointers in the return values are found and their referents retained. When the GC stack walk comes across a reflect call in progress on the stack, it needs to know whether to scan the results or not. It doesn't know the progress of the reflect call, so it can't decide by itself. The reflect package needs to tell it. This CL adds another slot in the frame of makeFuncStub and methodValueCall so we can put a boolean in there which tells the runtime whether to scan the results or not. This CL also adds the args length to reflectMethodValue so the runtime can restrict its scanning to only the args section (not the results) if the reflect package says the results aren't ready yet. Do a delicate dance in the reflect package to set the "results are valid" bit. We need to make sure we set the bit only after we've copied the results back to the stack. But we must set the bit before we drop reflect's copy of the results. Otherwise, we might have a state where (temporarily) no one has a live copy of the results. That's the state we were observing in issue #27695 before this CL. The bitmap used by the runtime currently contains only the args. (Actually, it contains all the bits, but the size is set so we use only the args portion.) This is safe for early in a reflect call, but unsafe late in a reflect call. The test issue27695.go demonstrates this unsafety. We change the bitmap to always include both args and results, and decide at runtime which portion to use. issue27695.go only has a test for method calls. Function calls were ok because there wasn't a safepoint between when reflect dropped its copy of the return values and when the caller is resumed. This may change when we introduce safepoints everywhere. This truncate-to-only-the-args was part of CL 9888 (in 2015). That part of the CL fixed the problem demonstrated in issue27695b.go but introduced the problem demonstrated in issue27695.go. TODO, in another CL: simplify FuncLayout and its test. stack return value is now identical to frametype.ptrdata + frametype.gcdata. Fixes #27695 Change-Id: I2d49b34e34a82c6328b34f02610587a291b25c5f Reviewed-on: https://go-review.googlesource.com/137440 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com>		2018-09-29 20:25:24 +00:00
..
bug083.dir
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bug345.dir	test: eliminate use of Perl in fixedbugs/bug345.go	2018-05-31 13:29:50 +00:00
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issue18911.dir	runtime: slightly better error message for assertion panics with identical looking types	2018-06-05 00:29:50 +00:00
issue19028.dir
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issue25055.dir	cmd/compile: fix "width not calculated" ICE	2018-07-06 20:25:52 +00:00
issue25984.dir	cmd/compile: fix compile failure for lazily resolved shadowed types	2018-06-22 17:57:09 +00:00
issue26341.dir	cmd/compile: fix ICE due to missing inline function body	2018-07-12 00:13:37 +00:00
issue27836.dir	test: add testcase for gccgo compile failure	2018-09-27 15:01:24 +00:00
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bug206.go	test: remove rundircmpout and cmpout actions	2018-05-31 17:36:45 +00:00
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bug328.go	test: remove rundircmpout and cmpout actions	2018-05-31 17:36:45 +00:00
bug328.out
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bug345.go	test: skip test/fixedbugs/bug345.go on windows	2018-06-01 21:46:07 +00:00
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bug409.go	test: remove rundircmpout and cmpout actions	2018-05-31 17:36:45 +00:00
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issue6899.go	test: remove rundircmpout and cmpout actions	2018-05-31 17:36:45 +00:00
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issue7921.go	test: skip some tests on noopt builder	2018-09-24 20:56:48 +00:00
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issue13265.go	cmd/compile: only support -race and -msan where they work	2018-08-21 03:38:27 +00:00
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issue15091.go	cmd/compile: only support -race and -msan where they work	2018-08-21 03:38:27 +00:00
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issue16008.go	cmd/compile: only support -race and -msan where they work	2018-08-21 03:38:27 +00:00
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issue17449.go	cmd/compile: only support -race and -msan where they work	2018-08-21 03:38:27 +00:00
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issue18231.go
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issue18392.go
issue18393.go
issue18410.go
issue18419.go
issue18459.go
issue18595.go
issue18636.go
issue18640.go	cmd/compile: correct alias cycle detection	2018-06-12 18:55:39 +00:00
issue18655.go
issue18661.go
issue18725.go
issue18747.go
issue18808.go
issue18882.go
issue18895.go
issue18906.go
issue18911.go	runtime: slightly better error message for assertion panics with identical looking types	2018-06-05 00:29:50 +00:00
issue18915.go
issue18994.go
issue19012.go
issue19028.go
issue19040.go
issue19056.go
issue19078.go
issue19084.go
issue19137.go
issue19168.go
issue19182.go
issue19201.go
issue19217.go
issue19246.go
issue19261.go
issue19275.go
issue19323.go
issue19359.go
issue19467.go
issue19482.go
issue19507.go
issue19515.go
issue19548.go
issue19555.go
issue19610.go
issue19632.go
issue19658.go
issue19667.go
issue19671.go
issue19678.go
issue19679.go
issue19696.go
issue19699.go
issue19699b.go
issue19705.go
issue19710.go
issue19743.go
issue19764.go
issue19783.go
issue19799.go
issue19880.go
issue19911.go
issue19947.go
issue19977.go
issue20029.go
issue20097.go
issue20145.go
issue20162.go
issue20174.go
issue20185.go
issue20227.go
issue20232.go
issue20233.go
issue20245.go
issue20250.go
issue20298.go
issue20333.go
issue20335.go
issue20415.go
issue20529.go
issue20530.go
issue20602.go
issue20682.go
issue20739.go
issue20749.go
issue20780.go	cmd/compile: include callee args section when checking frame too large	2018-06-02 18:00:44 +00:00
issue20789.go
issue20811.go
issue20812.go
issue20813.go
issue20923.go
issue21048.go
issue21120.go
issue21221.go
issue21253.go
issue21256.go
issue21273.go
issue21317.go
issue21655.go
issue21687.go
issue21709.go
issue21770.go
issue21808.go
issue21808.out
issue21879.go
issue21879.out
issue21882.go
issue21887.go	test: remove rundircmpout and cmpout actions	2018-05-31 17:36:45 +00:00
issue21887.out
issue21963.go
issue21988.go
issue22063.go
issue22076.go
issue22083.go
issue22164.go
issue22198.go
issue22200.go
issue22200b.go
issue22305.go
issue22351.go
issue22389.go
issue22429.go
issue22458.go
issue22581.go
issue22605.go
issue22660.go
issue22662.go
issue22662b.go	all: fix typos detected by github.com/client9/misspell	2018-08-23 15:54:07 +00:00
issue22683.go	test: remove rundircmpout and cmpout actions	2018-05-31 17:36:45 +00:00
issue22683.out
issue22781.go
issue22794.go
issue22822.go
issue22877.go
issue22881.go
issue22904.go
issue22941.go
issue22962.go
issue23093.go
issue23094.go	cmd/compile: fix printing of array types in error messages	2018-06-05 00:43:22 +00:00
issue23116.go
issue23179.go
issue23188.go	test: add order of evaluation test case that gccgo got wrong	2018-07-10 21:30:26 +00:00
issue23298.go
issue23305.go
issue23414.go
issue23489.go
issue23504.go
issue23521.go
issue23522.go
issue23545.go	cmd/compile: make sure alg functions are generated when we call them	2018-07-10 01:20:45 +00:00
issue23546.go	cmd/compile: make sure alg functions are generated when we call them	2018-07-10 01:20:45 +00:00
issue23586.go
issue23587.go
issue23609.go
issue23664.go
issue23719.go
issue23732.go
issue23812.go
issue23823.go	cmd/compile: correct alias cycle detection	2018-06-12 18:55:39 +00:00
issue23912.go
issue24120.go
issue24159.go
issue24173.go
issue24187.go
issue24339.go
issue24419.go	internal/bytealg: specify argmaps for exported functions	2018-07-10 17:13:53 +00:00
issue24449.go
issue24470.go
issue24503.go
issue24547.go
issue24651a.go	cmd/compile: only support -race and -msan where they work	2018-08-21 03:38:27 +00:00
issue24651b.go	cmd/compile: conditional on -race, disable inline of go:norace	2018-06-19 20:59:10 +00:00
issue24693.go
issue24693.out
issue24761.go
issue24763.go	cmd/compile: don't crash in untyped expr to interface conversion	2018-06-28 23:01:22 +00:00
issue24799.go
issue24801.go
issue24817.go
issue24937.go
issue24939.go	cmd/compile: correct alias cycle detection	2018-06-12 18:55:39 +00:00
issue25006.go
issue25055.go	cmd/compile: fix "width not calculated" ICE	2018-07-06 20:25:52 +00:00
issue25101.go	cmd/compile: revert internal parameter rename (from ".anonX" to "") before export	2018-06-05 20:22:07 +00:00
issue25322.go	test: remove rundircmpout and cmpout actions	2018-05-31 17:36:45 +00:00
issue25322.out
issue25507.go	cmd/compile: reject large argument areas	2018-05-29 16:58:05 +00:00
issue25516.go	cmd/compile: update WBLoads during deadcode	2018-05-29 17:45:36 +00:00
issue25727.go	cmd/compile: make case insensitive suggestions aware of package	2018-06-13 23:12:54 +00:00
issue25741.go	cmd/compile: fix OffPtr with negative offset on wasm	2018-06-06 14:40:25 +00:00
issue25776.go	cmd/compile: ensure that operand of ORETURN is not double-walked	2018-06-14 20:08:10 +00:00
issue25958.go	cmd/compile: more accurate position for select case error message	2018-06-19 17:52:23 +00:00
issue25966.go	cmd/compile: fold offset into address on Wasm	2018-06-27 14:30:00 +00:00
issue25984.go	cmd/compile: fix compile failure for lazily resolved shadowed types	2018-06-22 17:57:09 +00:00
issue25993.go	cmd/compile: convert uint32 to int32 in ARM constant folding rules	2018-06-22 16:25:32 +00:00
issue26024.go	cmd/compile: handle degenerate write barrier case	2018-07-12 19:06:09 +00:00
issue26043.go	cmd/compile: avoid remainder in loopbce when increment=0	2018-06-25 20:36:42 +00:00
issue26094.go	runtime: don't say "different packages" if they may not be different	2018-07-11 21:34:05 +00:00
issue26097.go	cmd/compile: mark CMOVLEQF, CMOVWEQF as cloberring AX	2018-06-28 18:39:56 +00:00
issue26105.go	cmd/compile: add LocalAddr that takes SP,mem operands	2018-07-12 18:45:31 +00:00
issue26116.go	cmd/compile: ensure that loop condition is detected correctly	2018-07-09 18:23:39 +00:00
issue26120.go	cmd/compile: check SSAability in handling of INDEX of 1-element array	2018-06-29 12:05:05 +00:00
issue26153.go	cmd/compile: keep autos whose address reaches a phi	2018-07-02 19:43:07 +00:00
issue26163.go	cmd/compile: run generic deadcode in -N mode	2018-07-02 20:53:23 +00:00
issue26248.go	test: add test for gccgo bug #26248	2018-07-10 01:19:37 +00:00
issue26335.go	test: add test case that failed with gccgo	2018-07-11 18:14:35 +00:00
issue26340.go	test: add test of valid code that gccgo failed to compile	2018-07-12 05:29:12 +00:00
issue26341.go	cmd/compile: fix ICE due to missing inline function body	2018-07-12 00:13:37 +00:00
issue26407.go	cmd/compile: keep autos if their address reaches a control value	2018-07-17 14:58:54 +00:00
issue26416.go	cmd/compile: fix crash on invalid struct literal	2018-07-18 20:32:04 +00:00
issue26426.go	cmd/compile: add test for OPmodify ops clobbering flags	2018-07-19 16:24:53 +00:00
issue26438.go	cmd/compile: fix an arm64's comparison bug	2018-07-18 14:15:05 +00:00
issue26495.go	test: add test for gccgo bug #26495	2018-07-20 20:08:15 +00:00
issue26616.go	cmd/compile: use more specific error message for assignment mismatch	2018-09-27 00:35:06 +00:00
issue26855.go	cmd/compile: fix error message for &T{} literal mismatch	2018-09-20 00:07:35 +00:00
issue27143.go	cmd/compile: prevent overflow in walkinrange	2018-08-26 21:52:27 +00:00
issue27278.go	cmd/compile: count nil check as use in dead auto elim	2018-08-30 02:19:37 +00:00
issue27289.go	cmd/compile: in prove, fix fence-post implications for unsigned domain	2018-08-31 08:54:38 +00:00
issue27356.go	cmd/compile: don't crash reporting misuse of shadowed built-in function	2018-09-06 02:49:21 +00:00
issue27595.go	cmd/compile: use more specific error message for assignment mismatch	2018-09-27 00:35:06 +00:00
issue27695.go	reflect: ensure correct scanning of return values	2018-09-29 20:25:24 +00:00
issue27695b.go	reflect: ensure correct scanning of return values	2018-09-29 20:25:24 +00:00
issue27718.go	cmd/compile: don't do floating point optimization x+0 -> x	2018-09-18 20:27:09 +00:00
issue27829.go	cmd/compile: fix precedence order bug	2018-09-24 17:43:55 +00:00
issue27836.go	test: add testcase for gccgo compile failure	2018-09-27 15:01:24 +00:00