X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Fdwarf2expr.h;h=e85486a5000ebdef4c4d4a5bb0b034b8e78e23db;hb=ee36d91878ff644d64438a90d5c6ff5d3fe91746;hp=61b8f003303eba6640f23475fb06cb4dce397457;hpb=ac56253ddece35aff4402b848f88ba40856102b1;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/dwarf2expr.h b/gdb/dwarf2expr.h index 61b8f00330..e85486a500 100644 --- a/gdb/dwarf2expr.h +++ b/gdb/dwarf2expr.h @@ -1,7 +1,6 @@ /* DWARF 2 Expression Evaluator. - Copyright (C) 2001, 2002, 2003, 2005, 2007, 2008, 2009, 2010 - Free Software Foundation, Inc. + Copyright (C) 2001-2013 Free Software Foundation, Inc. Contributed by Daniel Berlin . @@ -23,6 +22,69 @@ #if !defined (DWARF2EXPR_H) #define DWARF2EXPR_H +#include "leb128.h" +#include "gdbtypes.h" + +struct dwarf_expr_context; + +/* Virtual method table for struct dwarf_expr_context below. */ + +struct dwarf_expr_context_funcs +{ + /* Return the value of register number REGNUM. */ + CORE_ADDR (*read_reg) (void *baton, int regnum); + + /* Read LENGTH bytes at ADDR into BUF. */ + void (*read_mem) (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t length); + + /* Return the location expression for the frame base attribute, in + START and LENGTH. The result must be live until the current + expression evaluation is complete. */ + void (*get_frame_base) (void *baton, const gdb_byte **start, size_t *length); + + /* Return the CFA for the frame. */ + CORE_ADDR (*get_frame_cfa) (void *baton); + + /* Return the PC for the frame. */ + CORE_ADDR (*get_frame_pc) (void *baton); + + /* Return the thread-local storage address for + DW_OP_GNU_push_tls_address. */ + CORE_ADDR (*get_tls_address) (void *baton, CORE_ADDR offset); + + /* Execute DW_AT_location expression for the DWARF expression subroutine in + the DIE at DIE_OFFSET in the CU from CTX. Do not touch STACK while it + being passed to and returned from the called DWARF subroutine. */ + void (*dwarf_call) (struct dwarf_expr_context *ctx, cu_offset die_offset); + + /* Return the base type given by the indicated DIE. This can throw + an exception if the DIE is invalid or does not represent a base + type. If can also be NULL in the special case where the + callbacks are not performing evaluation, and thus it is + meaningful to substitute a stub type of the correct size. */ + struct type *(*get_base_type) (struct dwarf_expr_context *ctx, cu_offset die); + + /* Push on DWARF stack an entry evaluated for DW_TAG_GNU_call_site's + parameter matching KIND and KIND_U at the caller of specified BATON. + If DEREF_SIZE is not -1 then use DW_AT_GNU_call_site_data_value instead of + DW_AT_GNU_call_site_value. */ + void (*push_dwarf_reg_entry_value) (struct dwarf_expr_context *ctx, + enum call_site_parameter_kind kind, + union call_site_parameter_u kind_u, + int deref_size); + + /* Return the address indexed by DW_OP_GNU_addr_index. + This can throw an exception if the index is out of range. */ + CORE_ADDR (*get_addr_index) (void *baton, unsigned int index); + +#if 0 + /* Not yet implemented. */ + + /* Return the `object address' for DW_OP_push_object_address. */ + CORE_ADDR (*get_object_address) (void *baton); +#endif +}; + /* The location of a value. */ enum dwarf_value_location { @@ -41,14 +103,17 @@ enum dwarf_value_location DWARF_VALUE_LITERAL, /* The piece was optimized out. */ - DWARF_VALUE_OPTIMIZED_OUT + DWARF_VALUE_OPTIMIZED_OUT, + + /* The piece is an implicit pointer. */ + DWARF_VALUE_IMPLICIT_POINTER }; /* The dwarf expression stack. */ struct dwarf_stack_value { - ULONGEST value; + struct value *value; /* Non-zero if the piece is in memory and is known to be on the program's stack. It is always ok to set this to zero. @@ -75,42 +140,19 @@ struct dwarf_expr_context /* Target address size in bytes. */ int addr_size; - /* Offset used to relocate DW_OP_addr argument. */ + /* DW_FORM_ref_addr size in bytes. If -1 DWARF is executed from a frame + context and operations depending on DW_FORM_ref_addr are not allowed. */ + int ref_addr_size; + + /* Offset used to relocate DW_OP_addr and DW_OP_GNU_addr_index arguments. */ CORE_ADDR offset; /* An opaque argument provided by the caller, which will be passed to all of the callback functions. */ void *baton; - /* Return the value of register number REGNUM. */ - CORE_ADDR (*read_reg) (void *baton, int regnum); - - /* Read LENGTH bytes at ADDR into BUF. */ - void (*read_mem) (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t length); - - /* Return the location expression for the frame base attribute, in - START and LENGTH. The result must be live until the current - expression evaluation is complete. */ - void (*get_frame_base) (void *baton, const gdb_byte **start, size_t *length); - - /* Return the CFA for the frame. */ - CORE_ADDR (*get_frame_cfa) (void *baton); - - /* Return the thread-local storage address for - DW_OP_GNU_push_tls_address. */ - CORE_ADDR (*get_tls_address) (void *baton, CORE_ADDR offset); - - /* Execute DW_AT_location expression for the DWARF expression subroutine in - the DIE at DIE_OFFSET in the CU from CTX. Do not touch STACK while it - being passed to and returned from the called DWARF subroutine. */ - void (*dwarf_call) (struct dwarf_expr_context *ctx, size_t die_offset); - -#if 0 - /* Not yet implemented. */ - - /* Return the `object address' for DW_OP_push_object_address. */ - CORE_ADDR (*get_object_address) (void *baton); -#endif + /* Callback functions. */ + const struct dwarf_expr_context_funcs *funcs; /* The current depth of dwarf expression recursion, via DW_OP_call*, DW_OP_fbreg, DW_OP_push_object_address, etc., and the maximum @@ -120,8 +162,9 @@ struct dwarf_expr_context /* Location of the value. */ enum dwarf_value_location location; - /* For VALUE_LITERAL, a the current literal value's length and - data. */ + /* For DWARF_VALUE_LITERAL, the current literal value's length and + data. For DWARF_VALUE_IMPLICIT_POINTER, LEN is the offset of the + target DIE of sect_offset kind. */ ULONGEST len; const gdb_byte *data; @@ -173,9 +216,11 @@ struct dwarf_expr_piece int in_stack_memory; } mem; - /* The piece's register number or literal value, for - DWARF_VALUE_REGISTER or DWARF_VALUE_STACK pieces. */ - ULONGEST value; + /* The piece's register number, for DWARF_VALUE_REGISTER pieces. */ + int regno; + + /* The piece's literal value, for DWARF_VALUE_STACK pieces. */ + struct value *value; struct { @@ -185,6 +230,15 @@ struct dwarf_expr_piece /* The length of the available data. */ ULONGEST length; } literal; + + /* Used for DWARF_VALUE_IMPLICIT_POINTER. */ + struct + { + /* The referent DIE from DW_OP_GNU_implicit_pointer. */ + sect_offset die; + /* The byte offset into the resulting data. */ + LONGEST offset; + } ptr; } v; /* The length of the piece, in bits. */ @@ -198,24 +252,91 @@ void free_dwarf_expr_context (struct dwarf_expr_context *ctx); struct cleanup * make_cleanup_free_dwarf_expr_context (struct dwarf_expr_context *ctx); -void dwarf_expr_push (struct dwarf_expr_context *ctx, ULONGEST value, - int in_stack_memory); -void dwarf_expr_pop (struct dwarf_expr_context *ctx); +void dwarf_expr_push_address (struct dwarf_expr_context *ctx, + CORE_ADDR value, + int in_stack_memory); void dwarf_expr_eval (struct dwarf_expr_context *ctx, const gdb_byte *addr, size_t len); -ULONGEST dwarf_expr_fetch (struct dwarf_expr_context *ctx, int n); +struct value *dwarf_expr_fetch (struct dwarf_expr_context *ctx, int n); CORE_ADDR dwarf_expr_fetch_address (struct dwarf_expr_context *ctx, int n); int dwarf_expr_fetch_in_stack_memory (struct dwarf_expr_context *ctx, int n); +void dwarf_expr_require_composition (const gdb_byte *, const gdb_byte *, + const char *); + +/* Stub dwarf_expr_context_funcs implementations. */ + +void ctx_no_get_frame_base (void *baton, const gdb_byte **start, + size_t *length); +CORE_ADDR ctx_no_get_frame_cfa (void *baton); +CORE_ADDR ctx_no_get_frame_pc (void *baton); +CORE_ADDR ctx_no_get_tls_address (void *baton, CORE_ADDR offset); +void ctx_no_dwarf_call (struct dwarf_expr_context *ctx, cu_offset die_offset); +struct type *ctx_no_get_base_type (struct dwarf_expr_context *ctx, + cu_offset die); +void ctx_no_push_dwarf_reg_entry_value (struct dwarf_expr_context *ctx, + enum call_site_parameter_kind kind, + union call_site_parameter_u kind_u, + int deref_size); +CORE_ADDR ctx_no_get_addr_index (void *baton, unsigned int index); + +int dwarf_block_to_dwarf_reg (const gdb_byte *buf, const gdb_byte *buf_end); + +int dwarf_block_to_dwarf_reg_deref (const gdb_byte *buf, + const gdb_byte *buf_end, + CORE_ADDR *deref_size_return); + +int dwarf_block_to_fb_offset (const gdb_byte *buf, const gdb_byte *buf_end, + CORE_ADDR *fb_offset_return); + +int dwarf_block_to_sp_offset (struct gdbarch *gdbarch, const gdb_byte *buf, + const gdb_byte *buf_end, + CORE_ADDR *sp_offset_return); + +/* Wrappers around the leb128 reader routines to simplify them for our + purposes. */ + +static inline const gdb_byte * +gdb_read_uleb128 (const gdb_byte *buf, const gdb_byte *buf_end, + uint64_t *r) +{ + size_t bytes_read = read_uleb128_to_uint64 (buf, buf_end, r); -const gdb_byte *read_uleb128 (const gdb_byte *buf, const gdb_byte *buf_end, - ULONGEST * r); -const gdb_byte *read_sleb128 (const gdb_byte *buf, const gdb_byte *buf_end, - LONGEST * r); + if (bytes_read == 0) + return NULL; + return buf + bytes_read; +} -const char *dwarf_stack_op_name (unsigned int, int); +static inline const gdb_byte * +gdb_read_sleb128 (const gdb_byte *buf, const gdb_byte *buf_end, + int64_t *r) +{ + size_t bytes_read = read_sleb128_to_int64 (buf, buf_end, r); -void dwarf_expr_require_composition (const gdb_byte *, const gdb_byte *, - const char *); + if (bytes_read == 0) + return NULL; + return buf + bytes_read; +} + +static inline const gdb_byte * +gdb_skip_leb128 (const gdb_byte *buf, const gdb_byte *buf_end) +{ + size_t bytes_read = skip_leb128 (buf, buf_end); + + if (bytes_read == 0) + return NULL; + return buf + bytes_read; +} + +extern const gdb_byte *safe_read_uleb128 (const gdb_byte *buf, + const gdb_byte *buf_end, + uint64_t *r); + +extern const gdb_byte *safe_read_sleb128 (const gdb_byte *buf, + const gdb_byte *buf_end, + int64_t *r); + +extern const gdb_byte *safe_skip_leb128 (const gdb_byte *buf, + const gdb_byte *buf_end); #endif /* dwarf2expr.h */