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cross-avr-gcc7-bootstrap.21370
gcc7-pfe-0017-Backport-Add-patch_area_size-and-...
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File gcc7-pfe-0017-Backport-Add-patch_area_size-and-patch_area_entry-to.patch of Package cross-avr-gcc7-bootstrap.21370
From 961670bae0c7b37073dbc0bb58d730d1ed603d5d Mon Sep 17 00:00:00 2001 From: "H.J. Lu" <hjl.tools@gmail.com> Date: Fri, 1 May 2020 21:03:10 -0700 Subject: [PATCH 17/22] Backport Add patch_area_size and patch_area_entry to crtl Currently patchable area is at the wrong place. It is placed immediately after function label and before .cfi_startproc. A backend should be able to add a pseudo patchable area instruction durectly into RTL. This patch adds patch_area_size and patch_area_entry to crtl so that the patchable area info is available in RTL passes. It also limits patch_area_size and patch_area_entry to 65535, which is a reasonable maximum size for patchable area. gcc/ PR target/93492 * cfgexpand.c (pass_expand::execute): Set crtl->patch_area_size and crtl->patch_area_entry. * emit-rtl.h (rtl_data): Add patch_area_size and patch_area_entry. * opts.c (common_handle_option): Limit function_entry_patch_area_size and function_entry_patch_area_start to USHRT_MAX. Fix a typo in error message. * varasm.c (assemble_start_function): Use crtl->patch_area_size and crtl->patch_area_entry. * doc/invoke.texi: Document the maximum value for -fpatchable-function-entry. gcc/c-family/ PR target/93492 * c-attribs.c (handle_patchable_function_entry_attribute): Limit value to USHRT_MAX (65535). gcc/testsuite/ PR target/93492 * c-c++-common/patchable_function_entry-error-1.c: New test. * c-c++-common/patchable_function_entry-error-2.c: Likewise. * c-c++-common/patchable_function_entry-error-3.c: Likewise. --- gcc/c-family/c-attribs.c | 9 ++++ gcc/cfgexpand.c | 44 +++++++++++++++++++ gcc/doc/invoke.texi | 1 + gcc/emit-rtl.h | 6 +++ gcc/opts.c | 4 +- .../patchable_function_entry-error-1.c | 9 ++++ .../patchable_function_entry-error-2.c | 9 ++++ .../patchable_function_entry-error-3.c | 17 +++++++ gcc/varasm.c | 4 +- 9 files changed, 100 insertions(+), 3 deletions(-) create mode 100644 gcc/testsuite/c-c++-common/patchable_function_entry-error-1.c create mode 100644 gcc/testsuite/c-c++-common/patchable_function_entry-error-2.c create mode 100644 gcc/testsuite/c-c++-common/patchable_function_entry-error-3.c diff --git a/gcc/c-family/c-attribs.c b/gcc/c-family/c-attribs.c index f0d2b1ed500..c01baffbc57 100644 --- a/gcc/c-family/c-attribs.c +++ b/gcc/c-family/c-attribs.c @@ -3206,6 +3206,15 @@ handle_patchable_function_entry_attribute (tree *, tree name, tree args, *no_add_attrs = true; return NULL_TREE; } + + if (tree_to_uhwi (val) > USHRT_MAX) + { + warning (OPT_Wattributes, + "%qE attribute argument %qE is out of range (> 65535)", + name, val); + *no_add_attrs = true; + return NULL_TREE; + } } return NULL_TREE; } diff --git a/gcc/cfgexpand.c b/gcc/cfgexpand.c index 7fd3916a3c7..2a603823a71 100644 --- a/gcc/cfgexpand.c +++ b/gcc/cfgexpand.c @@ -6481,6 +6481,50 @@ pass_expand::execute (function *fun) if (crtl->tail_call_emit) fixup_tail_calls (); + unsigned HOST_WIDE_INT patch_area_size = function_entry_patch_area_size; + unsigned HOST_WIDE_INT patch_area_entry = function_entry_patch_area_start; + + tree patchable_function_entry_attr + = lookup_attribute ("patchable_function_entry", + DECL_ATTRIBUTES (cfun->decl)); + if (patchable_function_entry_attr) + { + tree pp_val = TREE_VALUE (patchable_function_entry_attr); + tree patchable_function_entry_value1 = TREE_VALUE (pp_val); + + patch_area_size = tree_to_uhwi (patchable_function_entry_value1); + patch_area_entry = 0; + if (TREE_CHAIN (pp_val) != NULL_TREE) + { + tree patchable_function_entry_value2 + = TREE_VALUE (TREE_CHAIN (pp_val)); + patch_area_entry = tree_to_uhwi (patchable_function_entry_value2); + } + } + + if (patch_area_entry > patch_area_size) + { + if (patch_area_size > 0) + warning (OPT_Wattributes, + "patchable function entry %wu exceeds size %wu", + patch_area_entry, patch_area_size); + patch_area_entry = 0; + } + + crtl->patch_area_size = patch_area_size; + crtl->patch_area_entry = patch_area_entry; + + /* This function is not present in gcc 7, nor the profile_count datastructures, + so it may be safe to assume that there is not enough engine implemented so + far to support that. */ +#if 0 + /* BB subdivision may have created basic blocks that are only reachable + from unlikely bbs but not marked as such in the profile. */ + + if (optimize) + propagate_unlikely_bbs_forward (); +#endif + /* Remove unreachable blocks, otherwise we cannot compute dominators which are needed for loop state verification. As a side-effect this also compacts blocks. diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index ad71be54e07..9fd3b013ff7 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -11445,6 +11445,7 @@ If @code{N=0}, no pad location is recorded. The NOP instructions are inserted at---and maybe before, depending on @var{M}---the function entry address, even before the prologue. +The maximum value of @var{N} and @var{M} is 65535. @end table diff --git a/gcc/emit-rtl.h b/gcc/emit-rtl.h index da60a2d808c..66bc1bef391 100644 --- a/gcc/emit-rtl.h +++ b/gcc/emit-rtl.h @@ -163,6 +163,12 @@ struct GTY(()) rtl_data { local stack. */ unsigned int stack_alignment_estimated; + /* How many NOP insns to place at each function entry by default. */ + unsigned short patch_area_size; + + /* How far the real asm entry point is into this area. */ + unsigned short patch_area_entry; + /* For reorg. */ /* Nonzero if function being compiled called builtin_return_addr or diff --git a/gcc/opts.c b/gcc/opts.c index d0430e777ee..3de12b3662f 100644 --- a/gcc/opts.c +++ b/gcc/opts.c @@ -2220,10 +2220,12 @@ common_handle_option (struct gcc_options *opts, function_entry_patch_area_start = 0; } if (function_entry_patch_area_size < 0 + || function_entry_patch_area_size > USHRT_MAX || function_entry_patch_area_start < 0 + || function_entry_patch_area_start > USHRT_MAX || function_entry_patch_area_size < function_entry_patch_area_start) - error ("invalid arguments for %<-fpatchable_function_entry%>"); + error ("invalid arguments for %<-fpatchable-function-entry%>"); free (patch_area_arg); } break; diff --git a/gcc/testsuite/c-c++-common/patchable_function_entry-error-1.c b/gcc/testsuite/c-c++-common/patchable_function_entry-error-1.c new file mode 100644 index 00000000000..f60bf46cfe3 --- /dev/null +++ b/gcc/testsuite/c-c++-common/patchable_function_entry-error-1.c @@ -0,0 +1,9 @@ +/* { dg-do compile { target { ! { nvptx*-*-* visium-*-* } } } } */ +/* { dg-options "-O2 -fpatchable-function-entry=65536,1" } */ +/* { dg-additional-options "-fno-pie" { target sparc*-*-* } } */ +/* { dg-error "invalid arguments for '-fpatchable-function-entry'" "" { target *-*-* } 0 } */ + +void +foo (void) +{ +} diff --git a/gcc/testsuite/c-c++-common/patchable_function_entry-error-2.c b/gcc/testsuite/c-c++-common/patchable_function_entry-error-2.c new file mode 100644 index 00000000000..90f88c78be7 --- /dev/null +++ b/gcc/testsuite/c-c++-common/patchable_function_entry-error-2.c @@ -0,0 +1,9 @@ +/* { dg-do compile { target { ! { nvptx*-*-* visium-*-* } } } } */ +/* { dg-options "-O2 -fpatchable-function-entry=1,65536" } */ +/* { dg-additional-options "-fno-pie" { target sparc*-*-* } } */ +/* { dg-error "invalid arguments for '-fpatchable-function-entry'" "" { target *-*-* } 0 } */ + +void +foo (void) +{ +} diff --git a/gcc/testsuite/c-c++-common/patchable_function_entry-error-3.c b/gcc/testsuite/c-c++-common/patchable_function_entry-error-3.c new file mode 100644 index 00000000000..4490e5c15ca --- /dev/null +++ b/gcc/testsuite/c-c++-common/patchable_function_entry-error-3.c @@ -0,0 +1,17 @@ +/* { dg-do compile { target { ! { nvptx*-*-* visium-*-* } } } } */ +/* { dg-additional-options "-fno-pie" { target sparc*-*-* } } */ + +void + __attribute__((patchable_function_entry(65536))) +foo1 (void) { /* { dg-warning "'patchable_function_entry' attribute argument '65536' is out of range" } */ +} + +void + __attribute__((patchable_function_entry(65536,1))) +foo2 (void) { /* { dg-warning "'patchable_function_entry' attribute argument '65536' is out of range" } */ +} + +void + __attribute__((patchable_function_entry(65536,65536))) +foo3 (void) { /* { dg-warning "'patchable_function_entry' attribute argument '65536' is out of range" } */ +} diff --git a/gcc/varasm.c b/gcc/varasm.c index 0e6f20db361..8d4c0386fe3 100644 --- a/gcc/varasm.c +++ b/gcc/varasm.c @@ -1829,8 +1829,8 @@ assemble_start_function (tree decl, const char *fnname) if (DECL_PRESERVE_P (decl)) targetm.asm_out.mark_decl_preserved (fnname); - unsigned HOST_WIDE_INT patch_area_size = function_entry_patch_area_size; - unsigned HOST_WIDE_INT patch_area_entry = function_entry_patch_area_start; + unsigned short patch_area_size = crtl->patch_area_size; + unsigned short patch_area_entry = crtl->patch_area_entry; tree patchable_function_entry_attr = lookup_attribute ("patchable_function_entry", DECL_ATTRIBUTES (decl)); -- 2.33.1
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