From 7629ae90d817ea1cb6928b1fe7036ef309ff094f Mon Sep 17 00:00:00 2001 From: Ramana Radhakrishnan Date: Tue, 25 Apr 2017 16:46:34 +0000 Subject: [PATCH] re PR target/77728 (Miscompilation multiple vector iteration on ARM) PR target/77728 * config/arm/arm.c: Include gimple.h. (aapcs_layout_arg): Emit -Wpsabi note if arm_needs_doubleword_align returns negative, increment ncrn only if it returned positive. (arm_needs_doubleword_align): Return int instead of bool, ignore DECL_ALIGN of non-FIELD_DECL TYPE_FIELDS chain members, but if there is any such non-FIELD_DECL > PARM_BOUNDARY aligned decl, return -1 instead of false. (arm_function_arg): Emit -Wpsabi note if arm_needs_doubleword_align returns negative, increment nregs only if it returned positive. (arm_setup_incoming_varargs): Likewise. (arm_function_arg_boundary): Emit -Wpsabi note if arm_needs_doubleword_align returns negative, return DOUBLEWORD_ALIGNMENT only if it returned positive. testsuite/ * g++.dg/abi/pr77728-1.C: New test. Co-Authored-By: Jakub Jelinek From-SVN: r247258 --- gcc/ChangeLog | 18 +++ gcc/config/arm/arm.c | 78 +++++++++--- gcc/testsuite/ChangeLog | 6 + gcc/testsuite/g++.dg/abi/pr77728-1.C | 171 +++++++++++++++++++++++++++ 4 files changed, 256 insertions(+), 17 deletions(-) create mode 100644 gcc/testsuite/g++.dg/abi/pr77728-1.C diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 1d35b3c9c2c..7e22408297c 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,21 @@ +2017-04-25 Ramana Radhakrishnan + Jakub Jelinek + + PR target/77728 + * config/arm/arm.c: Include gimple.h. + (aapcs_layout_arg): Emit -Wpsabi note if arm_needs_doubleword_align + returns negative, increment ncrn only if it returned positive. + (arm_needs_doubleword_align): Return int instead of bool, + ignore DECL_ALIGN of non-FIELD_DECL TYPE_FIELDS chain + members, but if there is any such non-FIELD_DECL + > PARM_BOUNDARY aligned decl, return -1 instead of false. + (arm_function_arg): Emit -Wpsabi note if arm_needs_doubleword_align + returns negative, increment nregs only if it returned positive. + (arm_setup_incoming_varargs): Likewise. + (arm_function_arg_boundary): Emit -Wpsabi note if + arm_needs_doubleword_align returns negative, return + DOUBLEWORD_ALIGNMENT only if it returned positive. + 2017-04-25 Marek Polacek PR sanitizer/80349 diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index f3a6b64b168..d719020dcde 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -64,6 +64,7 @@ #include "rtl-iter.h" #include "optabs-libfuncs.h" #include "gimplify.h" +#include "gimple.h" /* This file should be included last. */ #include "target-def.h" @@ -81,7 +82,7 @@ struct four_ints /* Forward function declarations. */ static bool arm_const_not_ok_for_debug_p (rtx); -static bool arm_needs_doubleword_align (machine_mode, const_tree); +static int arm_needs_doubleword_align (machine_mode, const_tree); static int arm_compute_static_chain_stack_bytes (void); static arm_stack_offsets *arm_get_frame_offsets (void); static void arm_add_gc_roots (void); @@ -6349,8 +6350,20 @@ aapcs_layout_arg (CUMULATIVE_ARGS *pcum, machine_mode mode, /* C3 - For double-word aligned arguments, round the NCRN up to the next even number. */ ncrn = pcum->aapcs_ncrn; - if ((ncrn & 1) && arm_needs_doubleword_align (mode, type)) - ncrn++; + if (ncrn & 1) + { + int res = arm_needs_doubleword_align (mode, type); + /* Only warn during RTL expansion of call stmts, otherwise we would + warn e.g. during gimplification even on functions that will be + always inlined, and we'd warn multiple times. Don't warn when + called in expand_function_start either, as we warn instead in + arm_function_arg_boundary in that case. */ + if (res < 0 && warn_psabi && currently_expanding_gimple_stmt) + inform (input_location, "parameter passing for argument of type " + "%qT changed in GCC 7.1", type); + else if (res > 0) + ncrn++; + } nregs = ARM_NUM_REGS2(mode, type); @@ -6455,12 +6468,16 @@ arm_init_cumulative_args (CUMULATIVE_ARGS *pcum, tree fntype, } } -/* Return true if mode/type need doubleword alignment. */ -static bool +/* Return 1 if double word alignment is required for argument passing. + Return -1 if double word alignment used to be required for argument + passing before PR77728 ABI fix, but is not required anymore. + Return 0 if double word alignment is not required and wasn't requried + before either. */ +static int arm_needs_doubleword_align (machine_mode mode, const_tree type) { if (!type) - return PARM_BOUNDARY < GET_MODE_ALIGNMENT (mode); + return GET_MODE_ALIGNMENT (mode) > PARM_BOUNDARY; /* Scalar and vector types: Use natural alignment, i.e. of base type. */ if (!AGGREGATE_TYPE_P (type)) @@ -6470,12 +6487,21 @@ arm_needs_doubleword_align (machine_mode mode, const_tree type) if (TREE_CODE (type) == ARRAY_TYPE) return TYPE_ALIGN (TREE_TYPE (type)) > PARM_BOUNDARY; + int ret = 0; /* Record/aggregate types: Use greatest member alignment of any member. */ for (tree field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) if (DECL_ALIGN (field) > PARM_BOUNDARY) - return true; + { + if (TREE_CODE (field) == FIELD_DECL) + return 1; + else + /* Before PR77728 fix, we were incorrectly considering also + other aggregate fields, like VAR_DECLs, TYPE_DECLs etc. + Make sure we can warn about that with -Wpsabi. */ + ret = -1; + } - return false; + return ret; } @@ -6532,10 +6558,15 @@ arm_function_arg (cumulative_args_t pcum_v, machine_mode mode, } /* Put doubleword aligned quantities in even register pairs. */ - if (pcum->nregs & 1 - && ARM_DOUBLEWORD_ALIGN - && arm_needs_doubleword_align (mode, type)) - pcum->nregs++; + if ((pcum->nregs & 1) && ARM_DOUBLEWORD_ALIGN) + { + int res = arm_needs_doubleword_align (mode, type); + if (res < 0 && warn_psabi) + inform (input_location, "parameter passing for argument of type " + "%qT changed in GCC 7.1", type); + else if (res > 0) + pcum->nregs++; + } /* Only allow splitting an arg between regs and memory if all preceding args were allocated to regs. For args passed by reference we only count @@ -6554,9 +6585,15 @@ arm_function_arg (cumulative_args_t pcum_v, machine_mode mode, static unsigned int arm_function_arg_boundary (machine_mode mode, const_tree type) { - return (ARM_DOUBLEWORD_ALIGN && arm_needs_doubleword_align (mode, type) - ? DOUBLEWORD_ALIGNMENT - : PARM_BOUNDARY); + if (!ARM_DOUBLEWORD_ALIGN) + return PARM_BOUNDARY; + + int res = arm_needs_doubleword_align (mode, type); + if (res < 0 && warn_psabi) + inform (input_location, "parameter passing for argument of type %qT " + "changed in GCC 7.1", type); + + return res > 0 ? DOUBLEWORD_ALIGNMENT : PARM_BOUNDARY; } static int @@ -26516,8 +26553,15 @@ arm_setup_incoming_varargs (cumulative_args_t pcum_v, if (pcum->pcs_variant <= ARM_PCS_AAPCS_LOCAL) { nregs = pcum->aapcs_ncrn; - if ((nregs & 1) && arm_needs_doubleword_align (mode, type)) - nregs++; + if (nregs & 1) + { + int res = arm_needs_doubleword_align (mode, type); + if (res < 0 && warn_psabi) + inform (input_location, "parameter passing for argument of " + "type %qT changed in GCC 7.1", type); + else if (res > 0) + nregs++; + } } else nregs = pcum->nregs; diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 0b2e2085612..cd4d1007f7f 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,9 @@ +2017-04-25 Ramana Radhakrishnan + Jakub Jelinek + + PR target/77728 + * g++.dg/abi/pr77728-1.C: New test. + 2017-04-25 Marek Polacek PR sanitizer/80349 diff --git a/gcc/testsuite/g++.dg/abi/pr77728-1.C b/gcc/testsuite/g++.dg/abi/pr77728-1.C new file mode 100644 index 00000000000..05f08c902f4 --- /dev/null +++ b/gcc/testsuite/g++.dg/abi/pr77728-1.C @@ -0,0 +1,171 @@ +// { dg-do compile { target arm_eabi } } +// { dg-options "-Wpsabi" } + +#include + +template +struct A { double p; }; + +A<0> v; + +template +struct B +{ + typedef A T; + int i, j; +}; + +struct C : public B<0> {}; +struct D {}; +struct E : public D, C {}; +struct F : public B<1> {}; +struct G : public F { static double y; }; +struct H : public G {}; +struct I : public D { long long z; }; +struct J : public D { static double z; int i, j; }; + +template +struct K : public D { typedef A T; int i, j; }; + +struct L { static double h; int i, j; }; + +int +fn1 (int a, B<0> b) // { dg-message "note: parameter passing for argument of type \[^\n\r]* changed in GCC 7\.1" } +{ + return a + b.i; +} + +int +fn2 (int a, B<1> b) +{ + return a + b.i; +} + +int +fn3 (int a, L b) // { dg-message "note: parameter passing for argument of type \[^\n\r]* changed in GCC 7\.1" } +{ + return a + b.i; +} + +int +fn4 (int a, int b, int c, int d, int e, int f, int g, int h, int i, int j, int k, int l, int m, B<0> n, ...) +// { dg-message "note: parameter passing for argument of type \[^\n\r]* changed in GCC 7\.1" "" { target *-*-* } .-1 } +{ + va_list ap; + va_start (ap, n); + int x = va_arg (ap, int); + va_end (ap); + return x; +} + +int +fn5 (int a, int b, int c, int d, int e, int f, int g, int h, int i, int j, int k, int l, int m, B<1> n, ...) +{ + va_list ap; + va_start (ap, n); + int x = va_arg (ap, int); + va_end (ap); + return x; +} + +int +fn6 (int a, int b, int c, int d, int e, int f, int g, int h, int i, int j, int k, int l, int m, C n, ...) +{ + va_list ap; + va_start (ap, n); + int x = va_arg (ap, int); + va_end (ap); + return x; +} + +int +fn7 (int a, int b, int c, int d, int e, int f, int g, int h, int i, int j, int k, int l, int m, E n, ...) +{ + va_list ap; + va_start (ap, n); + int x = va_arg (ap, int); + va_end (ap); + return x; +} + +int +fn8 (int a, int b, int c, int d, int e, int f, int g, int h, int i, int j, int k, int l, int m, H n, ...) +{ + va_list ap; + va_start (ap, n); + int x = va_arg (ap, int); + va_end (ap); + return x; +} + +int +fn9 (int a, int b, int c, int d, int e, int f, int g, int h, int i, int j, int k, int l, int m, I n, ...) +{ + va_list ap; + va_start (ap, n); + int x = va_arg (ap, int); + va_end (ap); + return x; +} + +int +fn10 (int a, int b, int c, int d, int e, int f, int g, int h, int i, int j, int k, int l, int m, J n, ...) +// { dg-message "note: parameter passing for argument of type \[^\n\r]* changed in GCC 7\.1" "" { target *-*-* } .-1 } +{ + va_list ap; + va_start (ap, n); + int x = va_arg (ap, int); + va_end (ap); + return x; +} + +int +fn11 (int a, int b, int c, int d, int e, int f, int g, int h, int i, int j, int k, int l, int m, K<0> n, ...) +// { dg-message "note: parameter passing for argument of type \[^\n\r]* changed in GCC 7\.1" "" { target *-*-* } .-1 } +{ + va_list ap; + va_start (ap, n); + int x = va_arg (ap, int); + va_end (ap); + return x; +} + +int +fn12 (int a, int b, int c, int d, int e, int f, int g, int h, int i, int j, int k, int l, int m, K<2> n, ...) +{ + va_list ap; + va_start (ap, n); + int x = va_arg (ap, int); + va_end (ap); + return x; +} + +void +test () +{ + static B<0> b0; + static B<1> b1; + static L l; + static C c; + static E e; + static H h; + static I i; + static J j; + static K<0> k0; + static K<2> k2; + fn1 (1, b0); // { dg-message "note: parameter passing for argument of type \[^\n\r]* changed in GCC 7\.1" } + fn2 (1, b1); + fn3 (1, l); // { dg-message "note: parameter passing for argument of type \[^\n\r]* changed in GCC 7\.1" } + fn4 (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, b0, 1, 2, 3, 4); + // { dg-message "note: parameter passing for argument of type \[^\n\r]* changed in GCC 7\.1" "" { target *-*-* } .-1 } + fn5 (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, b1, 1, 2, 3, 4); + fn6 (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, c, 1, 2, 3, 4); + fn7 (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, e, 1, 2, 3, 4); + fn8 (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, h, 1, 2, 3, 4); + fn9 (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, i, 1, 2, 3, 4); + fn10 (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, j, 1, 2, 3, 4); + // { dg-message "note: parameter passing for argument of type \[^\n\r]* changed in GCC 7\.1" "" { target *-*-* } .-1 } + fn11 (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, k0, 1, 2, 3, 4); + // { dg-message "note: parameter passing for argument of type \[^\n\r]* changed in GCC 7\.1" "" { target *-*-* } .-1 } + fn12 (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, k2, 1, 2, 3, 4); +} -- 2.30.2