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176 lines
6.0 KiB
176 lines
6.0 KiB
6 years ago
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diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
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index a8238a001ee..34f27c597a2 100644
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--- a/gcc/config/i386/i386.c
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+++ b/gcc/config/i386/i386.c
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@@ -8770,13 +8770,16 @@ ix86_setup_frame_addresses (void)
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labels in call and return thunks. */
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static int indirectlabelno;
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-/* True if call and return thunk functions are needed. */
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+/* True if call thunk function is needed. */
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static bool indirect_thunk_needed = false;
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/* Bit masks of integer registers, which contain branch target, used
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- by call and return thunks functions. */
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+ by call thunk functions. */
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static int indirect_thunks_used;
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+/* True if return thunk function is needed. */
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+static bool indirect_return_needed = false;
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+
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/* True if return thunk function via CX is needed. */
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static bool indirect_return_via_cx;
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@@ -8899,17 +8902,19 @@ output_indirect_thunk (int regno)
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}
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/* Output a funtion with a call and return thunk for indirect branch.
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- If REGNO != -1, the function address is in REGNO. Otherwise, the
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- function address is on the top of stack. */
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+ If REGNO != UNVALID_REGNUM,
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+ the function address is in REGNO. Otherwise, the function address is
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+ on the top of stack. Thunk is used for function return if RET_P is
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+ true. */
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static void
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-output_indirect_thunk_function (int regno)
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+output_indirect_thunk_function (unsigned int regno, bool ret_p)
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{
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char name[32];
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tree decl;
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/* Create __x86_indirect_thunk. */
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- indirect_thunk_name (name, regno, false);
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+ indirect_thunk_name (name, regno, ret_p);
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decl = build_decl (BUILTINS_LOCATION, FUNCTION_DECL,
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get_identifier (name),
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build_function_type_list (void_type_node, NULL_TREE));
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@@ -8953,45 +8958,6 @@ output_indirect_thunk_function (int regno)
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ASM_OUTPUT_LABEL (asm_out_file, name);
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}
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- /* Create alias for __x86_return_thunk or
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- __x86_return_thunk_ecx. */
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- bool need_alias;
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- if (regno == INVALID_REGNUM)
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- need_alias = true;
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- else if (regno == CX_REG)
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- need_alias = indirect_return_via_cx;
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- else
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- need_alias = false;
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-
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- if (need_alias)
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- {
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- char alias[32];
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-
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- indirect_thunk_name (alias, regno, true);
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-#if TARGET_MACHO
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- if (TARGET_MACHO)
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- {
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- fputs ("\t.weak_definition\t", asm_out_file);
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- assemble_name (asm_out_file, alias);
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- fputs ("\n\t.private_extern\t", asm_out_file);
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- assemble_name (asm_out_file, alias);
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- putc ('\n', asm_out_file);
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- ASM_OUTPUT_LABEL (asm_out_file, alias);
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- }
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-#else
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- ASM_OUTPUT_DEF (asm_out_file, alias, name);
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- if (USE_HIDDEN_LINKONCE)
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- {
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- fputs ("\t.globl\t", asm_out_file);
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- assemble_name (asm_out_file, alias);
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- putc ('\n', asm_out_file);
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- fputs ("\t.hidden\t", asm_out_file);
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- assemble_name (asm_out_file, alias);
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- putc ('\n', asm_out_file);
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- }
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-#endif
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- }
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-
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DECL_INITIAL (decl) = make_node (BLOCK);
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current_function_decl = decl;
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allocate_struct_function (decl, false);
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@@ -9038,14 +9004,19 @@ ix86_code_end (void)
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rtx xops[2];
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int regno;
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+ if (indirect_return_needed)
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+ output_indirect_thunk_function (INVALID_REGNUM, true);
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+ if (indirect_return_via_cx)
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+ output_indirect_thunk_function (CX_REG, true);
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if (indirect_thunk_needed)
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- output_indirect_thunk_function (-1);
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+ output_indirect_thunk_function (INVALID_REGNUM, false);
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for (regno = FIRST_REX_INT_REG; regno <= LAST_REX_INT_REG; regno++)
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{
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int i = regno - FIRST_REX_INT_REG + LAST_INT_REG + 1;
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if ((indirect_thunks_used & (1 << i)))
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- output_indirect_thunk_function (regno);
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+ output_indirect_thunk_function (regno, false);
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+
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}
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for (regno = AX_REG; regno <= SP_REG; regno++)
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@@ -9054,7 +9025,7 @@ ix86_code_end (void)
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tree decl;
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if ((indirect_thunks_used & (1 << regno)))
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- output_indirect_thunk_function (regno);
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+ output_indirect_thunk_function (regno, false);
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if (!(pic_labels_used & (1 << regno)))
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continue;
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@@ -24758,8 +24729,8 @@ ix86_output_function_return (bool long_p)
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{
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bool need_thunk = (cfun->machine->function_return_type
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== indirect_branch_thunk);
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- indirect_thunk_name (thunk_name, -1, true);
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- indirect_thunk_needed |= need_thunk;
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+ indirect_thunk_name (thunk_name, INVALID_REGNUM, true);
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+ indirect_return_needed |= need_thunk;
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fprintf (asm_out_file, "\tjmp\t%s\n", thunk_name);
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}
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else
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@@ -24783,8 +24754,6 @@ ix86_output_indirect_function_return (rtx ret_op)
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if (cfun->machine->function_return_type != indirect_branch_keep)
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{
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char thunk_name[32];
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- enum indirect_thunk_prefix need_prefix
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- = indirect_thunk_need_prefix (current_output_insn);
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unsigned int regno = REGNO (ret_op);
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gcc_assert (regno == CX_REG);
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@@ -24793,7 +24762,7 @@ ix86_output_indirect_function_return (rtx ret_op)
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{
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bool need_thunk = (cfun->machine->function_return_type
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== indirect_branch_thunk);
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- indirect_thunk_name (thunk_name, regno, need_prefix, true);
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+ indirect_thunk_name (thunk_name, regno, true);
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if (need_thunk)
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{
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indirect_return_via_cx = true;
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@@ -24802,7 +24771,7 @@ ix86_output_indirect_function_return (rtx ret_op)
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fprintf (asm_out_file, "\tjmp\t%s\n", thunk_name);
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}
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else
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- output_indirect_thunk (need_prefix, regno);
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+ output_indirect_thunk (regno);
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return "";
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}
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diff --git a/gcc/testsuite/gcc.target/i386/ret-thunk-9.c b/gcc/testsuite/gcc.target/i386/ret-thunk-9.c
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index d1db41cc128..a605c26c46f 100644
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--- a/gcc/testsuite/gcc.target/i386/ret-thunk-9.c
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+++ b/gcc/testsuite/gcc.target/i386/ret-thunk-9.c
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@@ -13,7 +13,7 @@ foo (void)
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/* { dg-final { scan-assembler "jmp\[ \t\]*__x86_return_thunk" } } */
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/* { dg-final { scan-assembler "jmp\[ \t\]*\.LIND" } } */
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/* { dg-final { scan-assembler "call\[ \t\]*\.LIND" } } */
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-/* { dg-final { scan-assembler "__x86_indirect_thunk:" } } */
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+/* { dg-final { scan-assembler "__x86_return_thunk:" } } */
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/* { dg-final { scan-assembler-times {\tpause} 1 { target { ! x32 } } } } */
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/* { dg-final { scan-assembler-times {\tlfence} 1 { target { ! x32 } } } } */
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/* { dg-final { scan-assembler "push(?:l|q)\[ \t\]*_?bar" { target { { ! x32 } && *-*-linux* } } } } */
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