Some architectures may use ',' in the attribute string, but it is not used as the separator for different targets. To avoid conflict, we introduce a new macro TARGET_FMV_ATTR_SEPARATOR to separate different clones.
As an example, according to RISC-V C-API Specification [1], RISC-V allows ',' in the attribute string in the "arch=" option to specify one more ISA extensions in the same target function, which conflict with the default separator to separate different clones. This patch introduces TARGET_FMV_ATTR_SEPARATOR for RISC-V and choose '#' as the separator, since '#' is not allowed in the target_clones option string. [1] https://github.com/riscv-non-isa/riscv-c-api-doc/blob/c6c5d6d9cf96b342293315a5dff3d25e96ef8191/src/c-api.adoc#__attribute__targetattr-string gcc/ChangeLog: * defaults.h (TARGET_FMV_ATTR_SEPARATOR): Define new macro. * multiple_target.cc (get_attr_str): Use TARGET_FMV_ATTR_SEPARATOR to separate attributes. (separate_attrs): Likewise. * config/riscv/riscv.h (TARGET_FMV_ATTR_SEPARATOR): Define TARGET_FMV_ATTR_SEPARATOR for RISC-V. --- gcc/config/riscv/riscv.h | 5 +++++ gcc/defaults.h | 4 ++++ gcc/multiple_target.cc | 19 ++++++++++++------- 3 files changed, 21 insertions(+), 7 deletions(-) diff --git a/gcc/config/riscv/riscv.h b/gcc/config/riscv/riscv.h index ca1b8329cdc..858cab72a4c 100644 --- a/gcc/config/riscv/riscv.h +++ b/gcc/config/riscv/riscv.h @@ -1298,4 +1298,9 @@ extern void riscv_remove_unneeded_save_restore_calls (void); STACK_BOUNDARY / BITS_PER_UNIT) \ : (crtl->outgoing_args_size + STACK_POINTER_OFFSET)) +/* According to the RISC-V C API, the arch string may contains ','. To avoid + the conflict with the default separator, we choose '#' as the separator for + the target attribute. */ +#define TARGET_FMV_ATTR_SEPARATOR '#' + #endif /* ! GCC_RISCV_H */ diff --git a/gcc/defaults.h b/gcc/defaults.h index ac2d25852ab..f451efcb33e 100644 --- a/gcc/defaults.h +++ b/gcc/defaults.h @@ -874,6 +874,10 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see #define TARGET_HAS_FMV_TARGET_ATTRIBUTE 1 #endif +/* Select a attribute separator for function multiversioning. */ +#ifndef TARGET_FMV_ATTR_SEPARATOR +#define TARGET_FMV_ATTR_SEPARATOR ',' +#endif /* Select a format to encode pointers in exception handling data. We prefer those that result in fewer dynamic relocations. Assume no diff --git a/gcc/multiple_target.cc b/gcc/multiple_target.cc index 1fdd279da04..5a056b44571 100644 --- a/gcc/multiple_target.cc +++ b/gcc/multiple_target.cc @@ -180,7 +180,7 @@ create_dispatcher_calls (struct cgraph_node *node) } } -/* Create string with attributes separated by comma. +/* Create string with attributes separated by TARGET_FMV_ATTR_SEPARATOR. Return number of attributes. */ static int @@ -194,17 +194,21 @@ get_attr_str (tree arglist, char *attr_str) { const char *str = TREE_STRING_POINTER (TREE_VALUE (arg)); size_t len = strlen (str); - for (const char *p = strchr (str, ','); p; p = strchr (p + 1, ',')) + for (const char *p = strchr (str, TARGET_FMV_ATTR_SEPARATOR); + p; + p = strchr (p + 1, TARGET_FMV_ATTR_SEPARATOR)) argnum++; memcpy (attr_str + str_len_sum, str, len); - attr_str[str_len_sum + len] = TREE_CHAIN (arg) ? ',' : '\0'; + attr_str[str_len_sum + len] + = TREE_CHAIN (arg) ? TARGET_FMV_ATTR_SEPARATOR : '\0'; str_len_sum += len + 1; argnum++; } return argnum; } -/* Return number of attributes separated by comma and put them into ARGS. +/* Return number of attributes separated by TARGET_FMV_ATTR_SEPARATOR and put + them into ARGS. If there is no DEFAULT attribute return -1. If there is an empty string in attribute return -2. If there are multiple DEFAULT attributes return -3. @@ -215,9 +219,10 @@ separate_attrs (char *attr_str, char **attrs, int attrnum) { int i = 0; int default_count = 0; + char separator_str[] = {TARGET_FMV_ATTR_SEPARATOR, '\0'}; - for (char *attr = strtok (attr_str, ","); - attr != NULL; attr = strtok (NULL, ",")) + for (char *attr = strtok (attr_str, separator_str); + attr != NULL; attr = strtok (NULL, separator_str)) { if (strcmp (attr, "default") == 0) { @@ -305,7 +310,7 @@ static bool expand_target_clones (struct cgraph_node *node, bool definition) { int i; - /* Parsing target attributes separated by comma. */ + /* Parsing target attributes separated by TARGET_FMV_ATTR_SEPARATOR. */ tree attr_target = lookup_attribute ("target_clones", DECL_ATTRIBUTES (node->decl)); /* No targets specified. */ -- 2.45.2
